CN212380574U - Balun-free planar quasi-yagi filtering antenna - Google Patents
Balun-free planar quasi-yagi filtering antenna Download PDFInfo
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- CN212380574U CN212380574U CN202021098388.0U CN202021098388U CN212380574U CN 212380574 U CN212380574 U CN 212380574U CN 202021098388 U CN202021098388 U CN 202021098388U CN 212380574 U CN212380574 U CN 212380574U
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- 238000001914 filtration Methods 0.000 title claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 50
- 230000005855 radiation Effects 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000000191 radiation effect Effects 0.000 claims abstract description 4
- 239000000523 sample Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 2
- 230000001629 suppression Effects 0.000 abstract description 5
- 238000004088 simulation Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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Abstract
The utility model discloses a plane quasi-yagi filtering antenna without balun, which comprises a first medium substrate and a second medium substrate, wherein the first medium substrate is positioned above the second medium substrate; the upper surface of the first dielectric substrate is provided with a director, two dipole radiation patches and a reflector, the two dipole radiation patches are positioned between the director and the reflector, and the two dipole radiation patches can generate radiation in an end-fire direction through the radiation effect of the director and the reflector; the upper surface of the second dielectric substrate is provided with a step impedance resonator, the lower surface of the second dielectric substrate is provided with a metal floor, the step impedance resonator is fed by a coaxial probe penetrating through the second dielectric substrate and the metal floor, and the director, the two dipole radiation patches and the reflector on the first dielectric substrate are excited through coupling of the step impedance resonator. The utility model discloses have better end-fire characteristic and filtering capability, in-band gain is stable, and has better outband suppression level, simple structure, and the area is little.
Description
Technical Field
The utility model belongs to the technical field of the technique of filtering antenna and specifically relates to indicate a planar accurate yagi filtering antenna of no balun.
Background
In a wireless communication system, as 5G communication starts to be used commercially, the performance requirement on an antenna is higher and higher, a miniaturized antenna receives more and more attention, and a filter antenna is widely applied due to the integrated design of a filter and an antenna; the microstrip quasi-yagi antenna has the characteristics of high gain, anti-interference capability and directional radiation. In the existing quasi-yagi filtering antenna, an active dipole is mainly excited, and a balun structure is needed for carrying out balance-unbalance conversion; and there are some antennas whose filtering function is mainly realized by adding filtering structure units with band-pass/band-stop characteristics, which all make the antenna structure more complicated. The end-fire performance of the quasi-yagi antenna is combined with the filtering characteristics of the filtering antenna, so that the design of the balun-free planar quasi-yagi filtering antenna has great research significance.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art's shortcoming and not enough, a simple and reliable accurate yagi filtering antenna in plane of no balun is proposed, through each radiating element of coupling excitation, and utilize the filtering characteristic that each unit resonance itself has, make the antenna have better end shot characteristic and filtering capability, a structure is simple, the balun structure that need not traditional accurate yagi filtering antenna, play balance-the switching action between the unbalance, easily integration and miniaturization, higher and flat gain has in its working frequency range, the outband suppression level is better, and the structure is simple, and the area is little, advantages such as with low costs.
In order to achieve the above object, the present invention provides a technical solution: a balun-free planar quasi-yagi filtering antenna comprises two dielectric substrates, namely a first dielectric substrate and a second dielectric substrate, wherein the first dielectric substrate is positioned above the second dielectric substrate; the upper surface of the first dielectric substrate is provided with a director, two dipole radiation patches and a reflector, the two dipole radiation patches are positioned between the director and the reflector, and the two dipole radiation patches can generate radiation in an end-fire direction through the radiation effect of the director and the reflector; the upper surface of the second dielectric substrate is provided with a step impedance resonator, the lower surface of the second dielectric substrate is provided with a metal floor, the step impedance resonator is fed by a coaxial probe penetrating through the second dielectric substrate and the metal floor, and the director, the two dipole radiation patches and the reflector on the first dielectric substrate are excited through coupling of the step impedance resonator.
Further, the step impedance resonator is an E-type step impedance resonator.
Compared with the prior art, the utility model, have following advantage and beneficial effect:
1. compare with existing accurate yagi filtering antenna, the utility model discloses the antenna passes through coupling excitation radiating element, need not the balun structure of traditional accurate yagi antenna, plays the conversion between balanced-unbalance, can realize one kind and need not the accurate yagi filtering antenna of balun.
2. Compare with existing accurate yagi filtering antenna, the utility model discloses the feed part of antenna and each radiating element can all be for syntonizer constitutional unit, and it utilizes syntonizer itself to have filtering characteristic, has realized filtering function.
3. Compare with existing accurate yagi filtering antenna, because cross-coupling structure's effect, make the utility model discloses the antenna produces radiation zero point, has better outband suppression level, sees according to electromagnetic simulation's result that the outband suppression level is about 18dB, and has stable in-band gain, about 6dBi, can be applied to sub-6GHz (3.4-3.6GHz), WiMAX (3.5GHz) etc. frequency channel in the 5G communication.
4. Compare with existing accurate yagi filtering antenna, the utility model discloses antenna design simple structure, the area is little, workable, and is with low costs moreover.
Drawings
Fig. 1 is a side view of the antenna of the present invention.
Fig. 2 is a top view of a first dielectric substrate.
Fig. 3 is a top view of a second dielectric substrate.
Fig. 4 is a bottom view of the second dielectric substrate.
Fig. 5 is a graph of S11 of HFSS simulation of the antenna of the present invention.
Fig. 6 is a gain curve diagram of HFSS simulation of the antenna of the present invention.
Fig. 7 shows the main plane radiation pattern of the HFSS simulation of the antenna of the present invention at 3.5 GHz.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
Referring to fig. 1 to 4, the balun-free planar quasi-yagi filter antenna provided in this embodiment includes two dielectric substrates, namely a first dielectric substrate a and a second dielectric substrate b, where the first dielectric substrate a is located above the second dielectric substrate b, a director 1, two dipole radiation patches 2 and 3, and a reflector 4 are disposed on an upper surface of the first dielectric substrate a, the two dipole radiation patches 2 and 3 are located between the director 1 and the reflector 4, and the two dipole radiation patches 2 and 3 can generate radiation in an end-fire direction through radiation effects of the director 1 and the reflector 4; the upper surface of the second dielectric substrate b is provided with an E-type stepped impedance resonator 5, the lower surface of the second dielectric substrate b is provided with a metal floor 6 (two rectangular grooves are etched, and the two rectangular grooves have the effect of improving the gain in the antenna end-fire direction), the E-type stepped impedance resonator 5 is fed by a coaxial probe 7 penetrating through the second dielectric substrate b and the metal floor 6, and couples and excites the director 1, the two dipole radiation patches 2 and 3 and the reflector 4 on the first dielectric substrate a through an air layer between the first dielectric substrate a and the second dielectric substrate b.
In this embodiment, the feeding portion and each radiating element of the antenna may be a resonator structure element, which utilizes the filtering characteristics of the resonator itself, so that the antenna has a filtering function. The first dielectric substrate a and the second dielectric substrate b are made of RO4003C, the relative dielectric constant of the first dielectric substrate a and the relative dielectric constant of the second dielectric substrate b are 3.38, the loss tangent of the first dielectric substrate b is 0.0027, the processing technology of the first dielectric substrate a is mature, the cost is low, the yield is high, the manufacturing process is simple, and the requirement of the quasi-yagi filter antenna on low manufacturing cost can be met.
In this embodiment, the overall size of the antenna is 40 x 3.548mm3. The verification simulation of the balun-free planar quasi-yagi filter antenna of the embodiment is performed by HFSS software. As shown in fig. 5, a curve of simulation results of S11 parameters (input port return loss) of the antenna in the frequency range of 2-5GHz is given; the frequency band of less than or equal to-10 dB of S11 is 3.25-3.78 GHz, and the relative bandwidth is 15.08%. As shown in FIG. 6, a simulation curve of the gain in the positive x-axis radial direction is shown, the maximum gain is 6.5dBi, and the out-of-band rejection level can reach 18 dB. As shown in fig. 7, the main plane radiation pattern is given at 3.5GHz, and it can be seen from fig. 7 that the antenna has an end-fire performance. Therefore, the simulation result shows that the utility model discloses a plane accurate yagi filtering antenna of no balun has better end and penetrates characteristic and filtering capability, and in-band gain is stable, and has better outband suppression level, and simple structure, the area is little, can satisfy the requirement of being applied to sub-6GHz (3.4-3.6GHz), WiMAX (3.5GHz) etc. frequency channel in the current 5G communication, is worth promoting.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that all the changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. A balun-free planar quasi-yagi filtering antenna comprises two dielectric substrates, namely a first dielectric substrate and a second dielectric substrate, wherein the first dielectric substrate is positioned above the second dielectric substrate; the method is characterized in that: the upper surface of the first dielectric substrate is provided with a director, two dipole radiation patches and a reflector, the two dipole radiation patches are positioned between the director and the reflector, and the two dipole radiation patches can generate radiation in an end-fire direction through the radiation effect of the director and the reflector; the upper surface of the second dielectric substrate is provided with a step impedance resonator, the lower surface of the second dielectric substrate is provided with a metal floor, the step impedance resonator is fed by a coaxial probe penetrating through the second dielectric substrate and the metal floor, and the director, the two dipole radiation patches and the reflector on the first dielectric substrate are excited through coupling of the step impedance resonator.
2. The balun-free planar quasi-yagi filter antenna as claimed in claim 1, wherein: the step impedance resonator is an E-type step impedance resonator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021098388.0U CN212380574U (en) | 2020-06-15 | 2020-06-15 | Balun-free planar quasi-yagi filtering antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021098388.0U CN212380574U (en) | 2020-06-15 | 2020-06-15 | Balun-free planar quasi-yagi filtering antenna |
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| CN212380574U true CN212380574U (en) | 2021-01-19 |
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| CN202021098388.0U Expired - Fee Related CN212380574U (en) | 2020-06-15 | 2020-06-15 | Balun-free planar quasi-yagi filtering antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786130A (en) * | 2020-06-15 | 2020-10-16 | 华南理工大学 | Balun-free planar quasi-yagi filtering antenna |
| CN113097709A (en) * | 2021-03-30 | 2021-07-09 | 华南理工大学 | High-selectivity plane filtering yagi antenna |
-
2020
- 2020-06-15 CN CN202021098388.0U patent/CN212380574U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786130A (en) * | 2020-06-15 | 2020-10-16 | 华南理工大学 | Balun-free planar quasi-yagi filtering antenna |
| CN111786130B (en) * | 2020-06-15 | 2024-09-13 | 华南理工大学 | Planar quasi-yagi filter antenna without balun |
| CN113097709A (en) * | 2021-03-30 | 2021-07-09 | 华南理工大学 | High-selectivity plane filtering yagi antenna |
| CN113097709B (en) * | 2021-03-30 | 2022-05-24 | 华南理工大学 | High-selectivity plane filtering yagi antenna |
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| CF01 | Termination of patent right due to non-payment of annual fee |