CN118508080B - Homopolar double-broadband omni-directional common-caliber antenna - Google Patents
Homopolar double-broadband omni-directional common-caliber antenna Download PDFInfo
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Abstract
The invention provides a homopolarization double-broadband omni-directional common-caliber antenna which comprises a first printed circuit board, a second printed circuit board, a third printed circuit board, a circular metal cavity, a circular metal ring, a first metal column and a second metal column, wherein the first printed circuit board is arranged on the first printed circuit board; the circular metal cavity is fixed on the upper surface of the second printed circuit board and surrounds the first printed circuit board; the circular metal ring is fixed on the upper surface of the third printed circuit board and surrounds the first printed circuit board and the second printed circuit board; the first printed circuit board is electrically connected with the second printed circuit board through a plurality of first metal columns arranged along the vertical direction; the second printed circuit board and the third printed circuit board are electrically connected through a plurality of second metal columns arranged along the vertical direction. The invention has the advantages of double frequency bands, wide frequency bands, high isolation, low profile, good omnidirectional radiation performance and the like.
Description
Technical Field
The invention relates to the field of communication antennas, in particular to a homopolarization double-broadband omni-directional common-caliber antenna.
Background
With the rapid development of wireless communication technology and the continuous growth of wireless terminal users, the amount of internet data transmission increases dramatically, and the network carrying capacity of operators is becoming more important. Wherein the wireless terminal is hosted by a user accessing the network indoors. Therefore, increasing the data throughput of indoor distribution systems is a key to solving the network load-bearing capacity deficiency. Nowadays, broadband vertical polarization omni-directional antennas represented by monopole antennas have been widely applied to indoor wireless communication systems due to the advantages of large bandwidth and omni-directional coverage, but single-port antennas obviously cannot realize the requirements of multi-input multi-output data reception and transmission.
The radiation characteristic of 360-degree full coverage of the omni-directional antenna makes it difficult to realize high isolation in common-caliber design of the omni-directional antenna with the same polarization. And secondly, the antenna has a large bandwidth, can support sub-6 GHz (1.7-2.7 GHz and 3.3-6 GHz) communication frequency bands, has a lower profile height, a smaller size and lower cost, and is a key for realizing wide application of the mobile communication antenna. Therefore, the design of the homopolar omni-directional common-caliber antenna with double frequency bands, wide frequency bands, good omnidirectionality and low profile has great challenges and extremely high application value.
In chinese patent No. CN105914453B, a low-profile vertically polarized omnidirectional antenna is designed by deforming a monopole antenna and using a metal supporting plate, and its profile height is only 0.046λ min (λmin, which is the wavelength corresponding to the lowest operating frequency), but its bandwidth is narrower. The Chinese patent with publication number CN109786931B proposes a compact broadband vertical polarization omnidirectional antenna, double resonance work is realized by introducing capacitive reactance loading and inductive reactance loading, the working bandwidth reaches 38.2%, and the radiation pattern is stable and the omnidirectional is good. The chinese patent of publication No. CN109888487B proposes a dual-band omni-directional antenna with a low frequency circularly polarized and a high frequency linearly polarized, and the bandwidths of the two frequency bands are 18.7% and 10.3%, respectively. However, these antennas have only one port, and it is difficult to meet the requirements of data reception and transmission of multiple input multiple output.
Therefore, the prior art is difficult to realize the homopolarization omnidirectional common-caliber antenna with double frequency bands, wide frequency bands, good omnidirectionality and low profile at the same time, and the related technology needs to be further improved and perfected.
Disclosure of Invention
The invention aims to provide a homopolarization dual-broadband omni-directional common-caliber antenna which has the characteristics of dual frequency bands, wide frequency bands, good omnidirectionality and low profile.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A homopolarization double-broadband omni-directional common-caliber antenna comprises a first printed circuit board, a second printed circuit board, a third printed circuit board, a circular metal cavity, a circular metal ring, a first metal column and a second metal column;
The second printed circuit board is supported above the middle part of the third printed circuit board through a second plastic column, and the first printed circuit board is supported above the middle part of the second printed circuit board through a first plastic column; the circular metal cavity is fixed on the upper surface of the second printed circuit board and surrounds the first printed circuit board; the circular metal ring is fixed on the upper surface of the third printed circuit board and surrounds the first printed circuit board and the second printed circuit board;
The first printed circuit board and the second printed circuit board are electrically connected through a plurality of first metal columns arranged along the vertical direction so as to realize vertical polarization omnidirectional radiation in a high frequency band; the second printed circuit board and the third printed circuit board are electrically connected through a plurality of second metal posts arranged along the vertical direction, and the second metal posts and the circular metal cavity form a dipole antenna so as to realize omnidirectional radiation in a low frequency band.
Further, the first printed circuit board includes a first dielectric substrate; the upper surface of the first dielectric substrate is printed with an annular metal patch and a first power distributor, and the lower surface of the first dielectric substrate is printed with a first circular patch;
N fan-shaped grooves are etched on the first circular patch and are used for improving high-frequency impedance matching; the N fan-shaped grooves are distributed around the center of the first circular patch at equal intervals along the circumferential direction;
The first power distributor is provided with an input end and N output ends, the input end of the first power distributor is correspondingly arranged above the center of the first circular patch, and the N output ends of the first power distributor are correspondingly arranged above the N fan-shaped grooves respectively; the annular metal patch is arranged around the first power distributor.
Further, the second printed circuit board includes a second dielectric substrate; the upper surface of the second dielectric substrate is printed with a gear-shaped patch and M first square patches;
M grooves are formed in the edge of the gear-shaped patch and are distributed at equal intervals along the circumferential direction around the center of the gear-shaped patch, so that the gear-shaped patch is in a circular gear shape as a whole; each groove of the gear-shaped patch is provided with a first square patch;
The circular metal cavity is arranged in the middle of the gear-shaped patch, and the lower end of the circular metal cavity is electrically connected with the gear-shaped patch; the diameter of the circular metal cavity is larger than that of the first printed circuit board and smaller than that of the gear-shaped patch, so that the first printed circuit board surrounds the inside of the circular metal cavity, and grooves of the first square patch and the gear-shaped patch are located outside the circular metal cavity.
Further, the number of the first metal columns is N, and each output end of the first power distributor is electrically connected with the gear-shaped patch on the upper surface of the second dielectric substrate through one first metal column; the upper end of the first metal column penetrates through the first dielectric substrate from the sector groove and then is welded with the output end of the first power distributor, and the lower end of the first metal column is electrically connected with the gear-shaped patch.
Further, a second power distributor and a third power distributor are printed on the lower surface of the second dielectric substrate;
The second power divider has one input and M/2 outputs, and the third power divider has one input and M/2 outputs; the output ends of the second power distributor and the third power distributor are respectively arranged below the M first square patches in a one-to-one correspondence manner;
the M/2 output ends of the second power distributor are respectively arranged below the M/2 first square patches in a one-to-one correspondence mode, and the M/2 output ends of the third power distributor are respectively arranged below the other M/2 first square patches in a one-to-one correspondence mode.
Further, the third printed circuit board comprises a third dielectric substrate, wherein the upper surface of the third dielectric substrate is printed with second round patches, and the lower surface of the third dielectric substrate is printed with M second square patches; the lower end of the circular metal ring is electrically connected with the second circular patch and is used for improving low-frequency impedance matching;
The M second square patches are in one-to-one correspondence with the M first square patches on the upper surface of the second dielectric substrate; the M second metal posts are arranged, and each output end of the second power distributor and each output end of the third power distributor are electrically connected with a second round patch on the upper surface of the third dielectric substrate through one second metal post; the upper end of the second metal column is electrically connected with the output end of the second power distributor or the third power distributor and is welded with the first square patch after penetrating through the second dielectric substrate; the lower end of the second metal post is electrically connected with the second round patch and is welded with the second square patch after penetrating through the third dielectric substrate.
Further, the lower surface of the third dielectric substrate is also printed with a filtering power divider and a filter;
The filtering power divider is used for realizing power distribution and filtering high-frequency signals, and is provided with three open-circuit branches, an input end and two output ends; the input end of the filtering power divider is a first feed port of the antenna, the input end of the filtering power divider is electrically connected with the fifth coaxial cable, and the two output ends of the filtering power divider are respectively and electrically connected with the first coaxial cable and the second coaxial cable so as to feed power to the second printed circuit board through the first coaxial cable and the second coaxial cable;
The filter is used for filtering low-frequency signals and is provided with five short circuit branches and one open circuit branch; the input end of the filter is a second feed port of the antenna, the input end of the filter is electrically connected with the fourth coaxial cable, and the output end of the filter is electrically connected with the third coaxial cable so as to feed power to the first printed circuit board through the third coaxial cable.
Further, at the lower end of the third coaxial cable, the outer conductor of the third coaxial cable is connected with the second round patch, and the inner conductor of the third coaxial cable penetrates through the third dielectric substrate from top to bottom and is electrically connected with the output end of the filter; and the outer conductor of the third coaxial cable is connected with the first round patch, and the inner conductor of the third coaxial cable penetrates through the first dielectric substrate from bottom to top and is electrically connected with the input end of the first power distributor.
Further, a first rectangular patch and a second rectangular patch are also printed on the lower surface of the second dielectric substrate, and the first rectangular patch and the second rectangular patch are respectively arranged beside the input ends of the second power distributor and the third power distributor; the first rectangular patch and the second rectangular patch are respectively and electrically connected with the gear-shaped patch through a plurality of metal through holes;
The outer conductor of the first coaxial cable is connected with the second round patch, and the inner conductor of the first coaxial cable penetrates through the third dielectric substrate from top to bottom and is electrically connected with one output end of the filtering power divider; the outer conductor of the first coaxial cable is welded with the first rectangular patch, and the inner conductor of the first coaxial cable is electrically connected with the input end of the second power distributor;
At the lower end of the second coaxial cable, the outer conductor of the second coaxial cable is connected with the second round patch, and the inner conductor of the second coaxial cable penetrates through the third dielectric substrate from top to bottom and is electrically connected with the other output end of the filtering power divider; and at the upper end of the second coaxial cable, the outer conductor of the second coaxial cable is welded with the second rectangular patch, and the inner conductor of the second coaxial cable is electrically connected with the input end of the third power distributor.
Further, the characteristic impedance of each of the first coaxial cable, the second coaxial cable, the third coaxial cable, the fourth coaxial cable and the fifth coaxial cable is 50Ω.
The invention has simple and compact structure and can well meet the requirements of a multi-input multi-output wireless communication system. The antenna of the invention can operate in the frequency range of 1.7-2.7 GHz and 3.3-6 GHz. Compared with the prior art, the invention has the advantages of double frequency bands, wide frequency bands, high isolation, low profile, good omnidirectional radiation performance and the like.
Specifically, the invention adopts a mode of combining a dipole and a monopole, and realizes the performance of the dual-broadband antenna, wherein the dipole is used for realizing the low-frequency omnidirectional performance, and the monopole is used for realizing the high-frequency omnidirectional performance. The antenna provided by the invention realizes a low-frequency bandwidth of not less than 46% and a high-frequency bandwidth of not less than 58%, and the reflection coefficient is lower than-10 dB; the antenna has isolation not lower than 40 dB, section lower than 0.06 lambda min and good omni-directional radiation.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a dual-broadband omni-directional common-caliber antenna with the same polarization provided by the embodiment of the invention.
Fig. 2 is a schematic side structural diagram of a homopolar dual-wideband omni-directional common-caliber antenna according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the upper surface structure of the first printed circuit board in the embodiment of the invention.
Fig. 4 is a schematic view of the lower surface structure of the first printed circuit board in the embodiment of the invention.
Fig. 5 is a schematic diagram of the upper surface structure of a second printed circuit board in an embodiment of the invention.
Fig. 6 is a schematic view of the lower surface structure of a second printed circuit board in an embodiment of the present invention.
Fig. 7 is a schematic diagram of the upper surface structure of a third printed circuit board in an embodiment of the invention.
Fig. 8 is a schematic view of the lower surface structure of a third printed circuit board in an embodiment of the present invention.
Fig. 9 is a transmission coefficient diagram obtained by antenna simulation according to an embodiment of the present invention.
Fig. 10 is a radiation pattern when feeding the first feeding port of the embodiment of the present invention at 1.7 GHz.
Fig. 11 is a radiation pattern when feeding the second feeding port of the embodiment of the present invention at 2.7 GHz.
Fig. 12 is a radiation pattern when feeding the second feeding port of the embodiment of the present invention at 3.3 GHz.
Fig. 13 is a radiation pattern when feeding the second feeding port of the embodiment of the present invention at 6 GHz.
Fig. 14 is a graph of gain at the time of feeding of the first feeding port of the embodiment of the invention.
Fig. 15 is a graph of gain at the time of feeding of the second feeding port of the embodiment of the invention.
Detailed Description
The technical scheme of the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and fig. 2, the dual-broadband omni-directional common-caliber antenna with the same polarization provided by the embodiment of the invention comprises a first printed circuit board 1, a second printed circuit board 3, a third printed circuit board 5, a circular metal cavity 2, a circular metal ring 4, a first metal column 6 and a second metal column 9;
The second printed circuit board 3 is supported above the middle part of the third printed circuit board 5 through a second plastic column 8, and the first printed circuit board 1 is supported above the middle part of the second printed circuit board 3 through a first plastic column 7; the circular metal cavity 2 is supported and fixed above the second printed circuit board 3 through a second plastic column 8 and encloses the first printed circuit board 1; the circular metal ring 4 is fixed to the upper surface of the third printed circuit board 5 and encloses the first printed circuit board 1 and the second printed circuit board 3.
The first printed circuit board 1 and the second printed circuit board 3 are electrically connected through a plurality of first metal columns 6 arranged along the vertical direction so as to realize good vertical polarization omnidirectional radiation in a higher frequency band; the second printed circuit board 3 and the third printed circuit board 5 are electrically connected through a plurality of second metal posts 9 arranged along the vertical direction, and the second metal posts 9 and the circular metal cavity 2 form a dipole antenna so as to realize good omnidirectional radiation in a lower frequency band.
As shown in fig. 3 and 4, the first printed circuit board 1 includes a first dielectric substrate 101; the upper surface of the first dielectric substrate 101 is printed with an annular metal patch 102 and a first power distributor 103, and the lower surface of the first dielectric substrate 101 is printed with a first circular patch 104;
N fan-shaped grooves 105 are etched on the first circular patch 104 for improving high-frequency impedance matching; the N fan-shaped grooves 105 are distributed around the center of the first circular patch 104 at equal intervals along the circumferential direction;
The first power divider 103 has an input end and four output ends, the input end of the first power divider 103 is correspondingly arranged above the center of the first circular patch 104, and the four output ends of the first power divider 103 are respectively correspondingly arranged above the four fan-shaped grooves 105; the annular metal patch 102 is disposed around the first power divider 103.
As shown in fig. 5, the second printed circuit board 3 includes a second dielectric substrate 301; the upper surface of the second dielectric substrate 301 is printed with a gear-shaped patch 302 and eight first square patches 303;
Eight grooves are formed at the edge of the gear-shaped patch 302, and the eight grooves are distributed around the center of the gear-shaped patch 302 at equal intervals along the circumferential direction, so that the gear-shaped patch 302 is in a circular gear shape as a whole; one first square patch 303 is disposed in each groove of the gear-shaped patch 302;
The circular metal cavity 2 is arranged in the middle of the gear-shaped patch 302, the axis of the circular metal cavity 2 coincides with the center of the gear-shaped patch 302, and the lower end of the circular metal cavity 2 is electrically connected with the gear-shaped patch 302; the diameter of the circular metal cavity 2 is larger than the first printed circuit board 1 and smaller than the gear-shaped patch 302, so that the first printed circuit board 1 surrounds the inside of the circular metal cavity 2, and the grooves of the first square patch 303 and the gear-shaped patch 302 are both located outside the circular metal cavity 2.
Four first metal posts 6, each output end of the first power divider 103 is electrically connected with the gear-shaped patch 302 on the upper surface of the second dielectric substrate 301 through one first metal post 6; the upper end of the first metal post 6 penetrates through the first dielectric substrate 101 from the sector groove 105, and then is welded with the output end of the first power distributor 103, and the lower end of the first metal post 6 is electrically connected with the gear-shaped patch 302.
As shown in fig. 6, the lower surface of the second dielectric substrate 301 is printed with a second power divider 304 and a third power divider 305;
The second power divider 304 has one input and four outputs, and the third power divider 305 has one input and four outputs; the output ends of the second power divider 304 and the third power divider 305 are respectively disposed below the eight first square patches 303 in a one-to-one correspondence manner;
The four output ends of the second power divider 304 are respectively disposed below the four first square patches 303 in a one-to-one correspondence manner, and the four output ends of the third power divider 305 are respectively disposed below the remaining four first square patches 303 in a one-to-one correspondence manner.
As shown in fig. 7 and 8, the third printed circuit board 5 includes a third dielectric substrate 502, the second circular patch 501 is printed on the upper surface of the third dielectric substrate 502, and eight second square patches 505 are printed on the lower surface of the third dielectric substrate 502; the axis of the circular metal ring 4 coincides with the center of the second circular patch 501, and the lower end of the circular metal ring 4 is electrically connected with the second circular patch 501, so as to improve low-frequency impedance matching.
The eight second square patches 505 are in one-to-one correspondence with the eight first square patches 303 on the upper surface of the second dielectric substrate 301; eight second metal pillars 9, each output end of the second power divider 304 and the third power divider 305 is electrically connected to the second circular patch 501 on the upper surface of the third dielectric substrate 502 through one second metal pillar 9; the upper end of the second metal pillar 9 is electrically connected with the output end of the second power divider 304 or the third power divider 305, and is welded with the first square patch 303 after penetrating the second dielectric substrate 301; the lower ends of the second metal posts 9 are electrically connected to the second circular patches 501 and soldered to the second square patches 505 after penetrating the third dielectric substrate 502.
Further, the lower surface of the third dielectric substrate 502 is also printed with a filter power divider 503 and a filter 504;
The filtering power divider 503 is configured to implement power distribution and filter out high frequency signals, and has three open branches, one input end and two output ends; the input end P1 of the filtering power divider 503 is a first feed port of the antenna, the input end P1 of the filtering power divider 503 is electrically connected with the fifth coaxial cable 14, and the two output ends P3 and P4 of the filtering power divider 503 are respectively electrically connected with the first coaxial cable 10 and the second coaxial cable 11 so as to feed power to the second printed circuit board 3 through the first coaxial cable 10 and the second coaxial cable 11;
the filter 504 is configured to filter out low frequency signals, and has five short circuit branches and one open circuit branch; the input end P2 of the filter 504 is a second feeding port of the antenna, the input end P2 of the filter 504 is electrically connected to the fourth coaxial cable 13, and the output end P5 of the filter 504 is electrically connected to the third coaxial cable 12 to feed the first printed circuit board 1 through the third coaxial cable 12.
Specifically, at the lower end of the third coaxial cable 12, the outer conductor of the third coaxial cable 12 is connected to the second circular patch 501, and the inner conductor of the third coaxial cable 12 penetrates through the third dielectric substrate 502 from top to bottom and is electrically connected to the output end P5 of the filter 504; at the upper end of the third coaxial cable 12, the outer conductor of the third coaxial cable 12 is connected to the first circular patch 104, and the inner conductor of the third coaxial cable 12 penetrates the first dielectric substrate 101 from bottom to top and is electrically connected to the input end of the first power splitter 103.
The lower surface of the second dielectric substrate 301 is further printed with a first rectangular patch 307 and a second rectangular patch 306, and the first rectangular patch 307 and the second rectangular patch 306 are respectively disposed beside the input ends of the second power divider 304 and the third power divider 305; the first rectangular patch 307 and the second rectangular patch 306 are electrically connected to the gear-shaped patch 302 through a plurality of metal vias, respectively;
At the lower end of the first coaxial cable 10, the outer conductor of the first coaxial cable 10 is connected with the second circular patch 501, and the inner conductor of the first coaxial cable 10 penetrates through the third dielectric substrate 502 from top to bottom and is electrically connected with one output end P3 of the filter power divider 503; at the upper end of the first coaxial cable 10, the outer conductor of the first coaxial cable 10 is welded with the first rectangular patch 307, and the inner conductor of the first coaxial cable 10 is electrically connected with the input end of the second power divider 304;
At the lower end of the second coaxial cable 11, the outer conductor of the second coaxial cable 11 is connected with the second circular patch 501, and the inner conductor of the second coaxial cable 11 penetrates through the third dielectric substrate 502 from top to bottom and is electrically connected with the other output end P4 of the filter power divider 503; at the upper end of the second coaxial cable 11, the outer conductor of the second coaxial cable 11 is soldered to the second rectangular patch 306, and the inner conductor of the second coaxial cable 11 is electrically connected to the input end of the third power divider 305.
In this embodiment, the characteristic impedances of the first coaxial cable 10, the second coaxial cable 11, the third coaxial cable 12, the fourth coaxial cable 13 and the fifth coaxial cable 14 are 50Ω.
Through the structure, the cross section of the homopolar double-broadband omni-directional common-caliber antenna is lower than 0.06 lambda min, wherein lambda min is the wavelength corresponding to the lowest frequency.
Fig. 9 is a transmission coefficient diagram obtained by antenna simulation in an embodiment of the present invention. In the figure, |s11| is the reflection coefficient of the first feed port, |s22| is the reflection coefficient of the second feed port, and |s12| is the reverse transmission coefficient (i.e., isolation) from the second feed port to the first feed port. As can be seen from the figure, in this embodiment, the frequency band with the antenna reflection coefficient smaller than-10 dB can cover at least two frequency bands of 1.65-2.7 GHz and 3.3-6 GHz, and the isolation between the two feed ports is greater than 40 dB.
Fig. 10 to 13 are radiation patterns when feeding the first and second feed ports of the antenna at frequencies of 1.7 GHz and 4.2 GHz, respectively. The results show that the antenna of the embodiment of the invention has good radiation characteristics.
Fig. 14 and 15 are graphs of gain obtained by antenna simulation according to an embodiment of the present invention. As can be seen, the gain of the vertically polarized antenna is about 3.3-7.1 dBi and the gain of the horizontally polarized antenna is about 4.1-8.0 dBi over the entire operating band. The result shows that the antenna of the embodiment of the invention has higher gain.
The invention provides a homopolar double-broadband omni-directional common-caliber antenna which consists of three printed circuit boards, twelve metal columns, a circular metal cavity, a circular metal ring, a filtering power divider, a filter and five coaxial cables. The first printed circuit board is integrated with an annular metal patch, a first power distributor, a first circular patch and four fan-shaped grooves. Four first metal columns are connected below the first power distributor and used for realizing high-frequency omni-directional performance; the fan-shaped groove is etched on the first circular patch for improved impedance matching; the annular metal patch surrounds the first power distributor and is used for improving impedance matching of high frequency. The second printed circuit board integrates a gear-shaped patch, eight first rectangular patches, a second power divider, a third power divider, a first rectangular patch, and a second rectangular patch. Wherein, a round metal cavity is connected above the gear-shaped patch, eight second metal columns are connected below the second power distributor and the third power distributor, the circular metal cavity and the eight second metal posts form a dipole for achieving low frequency omni-directional performance. The circular metal ring is connected above the third printed circuit board for improving the impedance performance of low frequency. The output end of the filtering power divider on the third printed circuit board is connected to the low-frequency antenna and is used for filtering high-frequency signals and realizing power distribution. The output end of the filter on the third printed circuit board is connected to the high-frequency antenna for filtering low-frequency signals.
The homopolarization double-broadband omni-directional common-caliber antenna provided by the invention has a compact structure, and can work in the frequency range of 1.7-2.7 GHz and the frequency range of 3.3-6 GHz. Compared with the prior art, the invention has the advantages of double frequency bands, wide frequency bands, high isolation, low profile, good omnidirectional radiation performance and the like. Specifically, the invention adopts a mode of combining a dipole and a monopole, and realizes the performance of the dual-broadband antenna, wherein the dipole is used for realizing the low-frequency omnidirectional performance, and the monopole is used for realizing the high-frequency omnidirectional performance. The antenna provided by the invention realizes a low-frequency bandwidth of not less than 46% and a high-frequency bandwidth of not less than 58%, and the reflection coefficient is lower than-10 dB; the antenna has isolation not lower than 40 dB, section lower than 0.06 lambda min and good omni-directional radiation. The invention has simple and compact structure and can well meet the requirements of a multi-input multi-output wireless communication system.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The homopolarization double-broadband omni-directional common-caliber antenna is characterized by comprising a first printed circuit board, a second printed circuit board, a third printed circuit board, a circular metal cavity, a circular metal ring, a first metal column and a second metal column;
The second printed circuit board is supported above the middle part of the third printed circuit board through a second plastic column, and the first printed circuit board is supported above the middle part of the second printed circuit board through a first plastic column; the circular metal cavity is fixed on the upper surface of the second printed circuit board and surrounds the first printed circuit board; the circular metal ring is fixed on the upper surface of the third printed circuit board and surrounds the first printed circuit board and the second printed circuit board;
The first printed circuit board and the second printed circuit board are electrically connected through a plurality of first metal columns arranged along the vertical direction so as to realize vertical polarization omnidirectional radiation in a high frequency band; the second printed circuit board is electrically connected with the third printed circuit board through a plurality of second metal posts arranged along the vertical direction, and the second metal posts and the circular metal cavity form a dipole antenna so as to realize omnidirectional radiation in a low frequency band;
The first printed circuit board includes a first dielectric substrate; the upper surface of the first dielectric substrate is printed with an annular metal patch and a first power distributor, and the lower surface of the first dielectric substrate is printed with a first circular patch;
The second printed circuit board includes a second dielectric substrate; the upper surface of the second dielectric substrate is printed with a gear-shaped patch and M first square patches;
the circular metal cavity is arranged in the middle of the gear-shaped patch, and the lower end of the circular metal cavity is electrically connected with the gear-shaped patch;
each output end of the first power distributor is electrically connected with the gear-shaped patch on the upper surface of the second dielectric substrate through one first metal column;
The lower surface of the second dielectric substrate is printed with a second power distributor and a third power distributor;
the third printed circuit board comprises a third dielectric substrate, wherein the upper surface of the third dielectric substrate is printed with second round patches, and the lower surface of the third dielectric substrate is printed with M second square patches; the lower end of the circular metal ring is electrically connected with the second circular patch and is used for improving low-frequency impedance matching;
The M second metal posts are arranged, and each output end of the second power distributor and each output end of the third power distributor are electrically connected with a second round patch on the upper surface of the third dielectric substrate through one second metal post;
the lower surface of the third dielectric substrate is also printed with a filtering power divider and a filter;
The filtering power divider is used for realizing power distribution and filtering high-frequency signals, and is provided with three open-circuit branches, an input end and two output ends; the input end of the filtering power divider is a first feed port of the antenna, the input end of the filtering power divider is electrically connected with the fifth coaxial cable, and the two output ends of the filtering power divider are respectively and electrically connected with the first coaxial cable and the second coaxial cable so as to feed power to the second printed circuit board through the first coaxial cable and the second coaxial cable;
The filter is used for filtering low-frequency signals and is provided with five short circuit branches and one open circuit branch; the input end of the filter is a second feed port of the antenna, the input end of the filter is electrically connected with the fourth coaxial cable, and the output end of the filter is electrically connected with the third coaxial cable so as to feed power to the first printed circuit board through the third coaxial cable.
2. The homopolar dual-broadband omni-directional co-aperture antenna of claim 1 wherein N scallops are etched on said first circular patch for improved high frequency impedance matching; the N fan-shaped grooves are distributed around the center of the first circular patch at equal intervals along the circumferential direction;
The first power distributor is provided with an input end and N output ends, the input end of the first power distributor is correspondingly arranged above the center of the first circular patch, and the N output ends of the first power distributor are correspondingly arranged above the N fan-shaped grooves respectively; the annular metal patch is arranged around the first power distributor.
3. The homopolarization dual-broadband omni-directional common-caliber antenna according to claim 2, wherein the edge of the gear-shaped patch is provided with M grooves which are distributed at equal intervals along the circumferential direction around the center of the gear-shaped patch, so that the gear-shaped patch is in a circular gear shape as a whole; each groove of the gear-shaped patch is provided with a first square patch;
The diameter of the circular metal cavity is larger than that of the first printed circuit board and smaller than that of the gear-shaped patch, so that the first printed circuit board surrounds the inside of the circular metal cavity, and grooves of the first square patch and the gear-shaped patch are located outside the circular metal cavity.
4. The homopolar dual-broadband omni-directional common-caliber antenna according to claim 3, wherein the upper end of the first metal post penetrates through the first dielectric substrate from the sector groove and then is welded with the output end of the first power distributor, and the lower end of the first metal post is electrically connected with the gear-shaped patch.
5. The homopolar dual broadband omni-directional co-aperture antenna of claim 3 wherein the second power splitter has one input and M/2 outputs and the third power splitter has one input and M/2 outputs; the output ends of the second power distributor and the third power distributor are respectively arranged below the M first square patches in a one-to-one correspondence manner;
the M/2 output ends of the second power distributor are respectively arranged below the M/2 first square patches in a one-to-one correspondence mode, and the M/2 output ends of the third power distributor are respectively arranged below the other M/2 first square patches in a one-to-one correspondence mode.
6. The homopolar dual broadband omni-directional co-aperture antenna of claim 5 wherein the M second square patches are in one-to-one correspondence with the M first square patches on the upper surface of the second dielectric substrate; the upper end of the second metal column is electrically connected with the output end of the second power distributor or the third power distributor and is welded with the first square patch after penetrating through the second dielectric substrate; the lower end of the second metal post is electrically connected with the second round patch and is welded with the second square patch after penetrating through the third dielectric substrate.
7. The homopolarization dual-broadband omni-directional common-caliber antenna according to claim 6, wherein at the lower end of the third coaxial cable, an outer conductor of the third coaxial cable is connected with the second circular patch, and an inner conductor of the third coaxial cable penetrates through the third dielectric substrate from top to bottom and is electrically connected with the output end of the filter; and the outer conductor of the third coaxial cable is connected with the first round patch, and the inner conductor of the third coaxial cable penetrates through the first dielectric substrate from bottom to top and is electrically connected with the input end of the first power distributor.
8. The homopolarization dual-broadband omni-directional common-caliber antenna according to claim 6, wherein a first rectangular patch and a second rectangular patch are further printed on the lower surface of the second dielectric substrate, and the first rectangular patch and the second rectangular patch are respectively arranged beside the input ends of the second power distributor and the third power distributor; the first rectangular patch and the second rectangular patch are respectively and electrically connected with the gear-shaped patch through a plurality of metal through holes;
The outer conductor of the first coaxial cable is connected with the second round patch, and the inner conductor of the first coaxial cable penetrates through the third dielectric substrate from top to bottom and is electrically connected with one output end of the filtering power divider; the outer conductor of the first coaxial cable is welded with the first rectangular patch, and the inner conductor of the first coaxial cable is electrically connected with the input end of the second power distributor;
At the lower end of the second coaxial cable, the outer conductor of the second coaxial cable is connected with the second round patch, and the inner conductor of the second coaxial cable penetrates through the third dielectric substrate from top to bottom and is electrically connected with the other output end of the filtering power divider; and at the upper end of the second coaxial cable, the outer conductor of the second coaxial cable is welded with the second rectangular patch, and the inner conductor of the second coaxial cable is electrically connected with the input end of the third power distributor.
9. The homopolarization dual broadband omni-directional co-aperture antenna of claim 6 wherein the characteristic impedance of the first, second, third, fourth and fifth coaxial cables is 50Ω.
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| CN115986424A (en) * | 2023-03-20 | 2023-04-18 | 广东工业大学 | Ultra-wideband vertical polarization patch omnidirectional antenna |
| CN116646716A (en) * | 2023-06-08 | 2023-08-25 | 南通大学 | Low-profile dual-polarized indoor distributed antenna |
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| US6518931B1 (en) * | 2000-03-15 | 2003-02-11 | Hrl Laboratories, Llc | Vivaldi cloverleaf antenna |
| CN104157972A (en) * | 2014-08-25 | 2014-11-19 | 罗森伯格技术（昆山）有限公司 | Dual-polarization vibrator |
| CN105720361B (en) * | 2016-01-26 | 2018-06-19 | 电子科技大学 | A kind of broadband low section dual-polarization omnidirectional antenna based on Artificial magnetic conductor structure |
| CN107634343A (en) * | 2017-09-03 | 2018-01-26 | 电子科技大学 | A kind of coplanar Shared aperture antenna for base station of two-band |
| EP4044373A4 (en) * | 2019-11-07 | 2022-10-12 | Huawei Technologies Co., Ltd. | Omnidirectional dual-polarized antenna and communication device |
| CN116231288B (en) * | 2023-05-09 | 2023-06-30 | 广东工业大学 | Low-profile dual-frequency vertical polarization omnidirectional antenna |
| CN116864976A (en) * | 2023-08-22 | 2023-10-10 | 兰州大学 | Omnidirectional circularly polarized antenna with double frequency bands |
| CN117410703A (en) * | 2023-11-21 | 2024-01-16 | 南京控维高新科技有限公司 | Dual-polarized high-gain dual-frequency 5G base station antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115986424A (en) * | 2023-03-20 | 2023-04-18 | 广东工业大学 | Ultra-wideband vertical polarization patch omnidirectional antenna |
| CN116646716A (en) * | 2023-06-08 | 2023-08-25 | 南通大学 | Low-profile dual-polarized indoor distributed antenna |
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