CN209169384U - A kind of high-isolation mimo antenna - Google Patents

Abstract

The utility model discloses a kind of high-isolation mimo antennas, including medium substrate (1), at least two aerial radiation ends (2), filtering decoupling network (3) and earth plate, the one side of each aerial radiation end (2) and filtering decoupling network (3) setting in medium substrate (1), another side of the earth plate setting in medium substrate (1)；The filtering decoupling network (3) is connected to position between each aerial radiation end (2).The utility model is used for the antenna of intelligent terminal.

Description

A kind of high-isolation mimo antenna

Technical field

The utility model relates to antenna technical fields, and in particular to a kind of high-isolation mimo antenna.

Background technique

Mobile communication is one of Developing field the most quick, and mobile communication experienced several generations change, from mobile electricity Unprecedented high efficiency and convenience, especially in mobile communication field, electromagnetic wave are provided to people in words, internet Occur realizing wire communication developing by leaps and bounds to wireless communication, and present multimedia communication realizes single voice data It is transmitted to integrated services data such as integrated image, data, audios.In recent years, with more and more terminal users and wirelessly Data communication services, communication system provide broader band bandwidth, higher rate to wireless penetration, high speed, diversified demand Data communication services, so that wireless communication system plays more and more important role in people's lives.

4G and 5G communication era, intelligent terminal become the main tool of people's online, and this requires intelligent terminals can be real The data transmission of existing high reliability and high-speed.MIMO technique is the key technology for solving the problems, such as this, and It is widely used in the base station end and mobile terminal of 4G communication.The characteristics of mimo system is in transmitter or receiver In possess mutiple antennas, the multipath category of wireless channel can be utilized under the premise of not increasing transmission power and system spectrum Property improve transmission quality and power system capacity.It must be not phase in order to make mimo system that there is preferable performance, between antenna element (coupling is lower) closed, however, the space that can be reserved in mobile device for antenna is very limited, so that the sky between antenna Between distance can not be more than or equal to a wavelength.Then multiple broad-band antennas with lower coupling are integrated in portable device It is a comparison stubborn problem, the especially coupling in the reduction confined space between mutiple antennas.

Utility model content

The technical issues of the utility model solves is to provide a kind of lower MIMO of coupling for the deficiency in background technique Antenna.

In order to solve the above technical problems, the technical solution of the utility model is: a kind of high-isolation mimo antenna, including be situated between Matter substrate, at least two aerial radiation ends, filtering decoupling network and earth plate, each aerial radiation end and filtering decoupling network The one side of medium substrate is set, and the another side of medium substrate is arranged in the earth plate；The filtering decoupling network is connected to Position between each aerial radiation end.

Further, the filtering decoupling network includes the first extension minor matters and semi-closed structure, each aerial radiation End extends to form one first extension minor matters to position between each aerial radiation end respectively, and each described first extends minor matters seals from half The opening for closing structure is extend into inside semi-closed structure, and multiple second are provided in the semi-closed structure and extends minor matters.

Further, the aerial radiation end is the monopole radiation patch being printed on medium substrate.

Further, the aerial radiation end is F shape metal patch.

Further, the earth plate is the metal patch being printed on medium substrate.

Further, the medium substrate be use dielectric constant for 4.4 ± 3% FR4 substrate.

Further, 50 ohm of feeding microstrip lines are connected at the feed point at the aerial radiation end.

Further, including two symmetrically arranged aerial radiation ends, the filtering decoupling network are arranged in two antennas Between spoke side.

Beneficial effect of the utility model mainly has the following: position setting filtering is gone between each aerial radiation end Coupling network reduces the electric wave of an aerial radiation by line absorption in other day, to drop by being filtered between the electric wave antenna Intercoupling between low each aerial radiation end, improves the isolation at each aerial radiation end.

Detailed description of the invention

Fig. 1 is the positive structural schematic diagram of high-isolation mimo antenna in the utility model embodiment one；

Fig. 2 is high-isolation mimo antenna S parameter in the utility model embodiment one with frequency variation curve schematic diagram.

The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art, The omitting of some known structures and their instructions in the attached drawings are understandable；The same or similar label corresponds to same or similar Component；The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent.

Specific embodiment

In order to facilitate the understanding of those skilled in the art, below in conjunction with attached drawing and embodiment to the utility model carry out into One step detailed description.

Embodiment one

Refering to fig. 1, a kind of high-isolation mimo antenna, may be used as the antenna of the intelligent mobile terminals such as mobile phone.MIMO days Line includes medium substrate 1, at least two aerial radiation ends 2, filters decoupling network 3 and earth plate (not shown), each described The one side of medium substrate 1 is arranged in aerial radiation end 2 and filtering decoupling network 3, can be set in the front of medium substrate 1；Institute The another side that medium substrate 1 is arranged in earth plate is stated, can be set at the back side of medium substrate 1.The formation of mutiple antennas spoke side 2 Mimo antenna, filtering decoupling network 3 is connected to position between each aerial radiation end 2, by being filtered between the electric wave antenna, The electric wave of an aerial radiation is reduced by line absorption in other day, to reduce intercoupling between each aerial radiation end 2, is mentioned The isolation at high each aerial radiation end.Filtering decoupling network 3 can be best using existing filter circuits such as LC, RC circuits To realize, multiband filters setting multiple groups LC, RC filter circuit between aerial radiation end, so that the mimo antenna of the present embodiment is in width Intercoupling for each frequency range can be reduced when the lower radiation of frequency and reception, guarantees isolation of the antenna under wideband work.

Refering to fig. 1 with 2, preferably, the filtering decoupling network 3 is using such as flowering structure: extending minor matters 31 including first With semi-closed structure 32, each aerial radiation end 2 extends to form one first to position between each aerial radiation end respectively and prolongs Stretch minor matters 31, each first extension minor matters 31 from the opening of semi-closed structure 32 extend into 32 inside of semi-closed structure (not with Semi-closed structure 32 is in contact), extend minor matters 31 for each other aerial radiation ends 2 of 2 radiation direction of aerial radiation end by first Electric wave introduce filtering decoupling network 3 and to reduce electric wave of the aerial radiation to other antennas reduce each aerial radiation end Coupling between 2 improves the isolation between aerial radiation end 2.It is provided with multiple second in the semi-closed structure 32 and extends branch Save the filtering of 33, Lai Shixian multifrequency.

Refering to fig. 1 and Fig. 2, pass through the length that optimization first extends minor matters 31, second extends position, the length etc. of minor matters 33 Parameter, the antenna that the present embodiment may be implemented have preferable isolation in 1.8Ghz-3.1Ghz band operation, and Fig. 1 is excellent Mimo antenna structural schematic diagram after change, the impedance band width of antenna are 1.86 GHz(1.24 GHz -3.10 GHz), day The relative bandwidth of line is 42.9 %, which includes 1.9 GHz, Wi-Fi 2.4 of GSM in intelligent terminal communication The frequency points such as 2.4 GHz of GHz, Bluetooth, FDD LTE 2.5-2.7 GHz.The greatest irradiation direction of antenna is plane normal direction Both direction on, and uniform omnidirectional radiation can be made in both directions.Fig. 2 is with simulation software to entire MIMO days Line emulate resulting S parameter with frequency variation curve schematic diagram, it can be seen from the figure that antenna structure is in frequency band 1.24 The degree of coupling in GHz~3.10GHz is below -19.2dB, can satisfy the requirement less than -15 dB required in engineering completely. Two element antennas have uniform radiation characteristic on plane normal direction, and the radiation on main polarization direction is far longer than Radiation on cross polarization direction, so two antennas all have good cross polarization isolation.

Refering to fig. 1, the aerial radiation end 2 is the monopole radiation patch being printed on medium substrate 1, the bandwidth of antenna What can be done is wider, realizes the radiation and reception of 1.8GHz-3.1GHz frequency range.The aerial radiation end 2 is preferably with F shape gold Belong to patch.The first of the filtering decoupling network 3 extends minor matters 31, semi-closed structure 32 and second extends minor matters 33 also using Jie Metal patch structure on matter substrate 1, equally, the earth plate is the metal patch being printed on medium substrate 1, to be formed One microstrip antenna.The medium substrate 1 be use dielectric constant for 4.4 ± 3% FR4 substrate.The aerial radiation end 2 50 ohm of feeding microstrip lines 4 are connected at feed point, the signal wire of the radiating system of the intelligent terminals such as mobile phone can be with two micro-strips The feeding microstrip line of antenna is connected directly.

A kind of common mimo antenna, including two symmetrically arranged aerial radiation ends 2, two antennas are shown in Fig. 1 Spoke side can realize broadband radiation.The polarization mode of two monopole antennas is all linear polarization, and other of two antennas are special Property is substantially the same.The filtering decoupling network 3 is arranged between two aerial radiation ends 2, adds between two aerial radiation ends A filtering decoupling network is entered, has been similar to a broadband filter, antenna can have been reduced in specific frequency ranges of operation Between coupling.More than two mutiple antennas spoke sides 2 also can be set as needed in practice, at each aerial radiation end One filtering decoupling network 3 is set between 2.

Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments Exhaustion.Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in Within the protection scope of the utility model claims.

Claims (8)

1. a kind of high-isolation mimo antenna, it is characterised in that: including medium substrate (1), at least two aerial radiation ends (2), Decoupling network (3) and earth plate are filtered, each aerial radiation end (2) and filtering decoupling network (3) are arranged in medium substrate (1) One side, another side of the earth plate setting in medium substrate (1)；The filtering decoupling network (3) is connected to each antenna spoke Penetrate position between end (2).

2. high-isolation mimo antenna according to claim 1, it is characterised in that: the filtering decoupling network (3) includes First extends minor matters (31) and semi-closed structure (32), and each aerial radiation end (2) is respectively to the meta position at each aerial radiation end It sets and extends to form one first extension minor matters (31), each described first extends minor matters (31) stretches from the opening of semi-closed structure (32) Enter to semi-closed structure (32) inside, the semi-closed structure (32) is interior to be provided with multiple second extensions minor matters (33).

3. high-isolation mimo antenna according to claim 1, it is characterised in that: the aerial radiation end (2) is printing Monopole radiation patch on medium substrate (1).

4. high-isolation mimo antenna according to claim 3, it is characterised in that: the aerial radiation end (2) is F shape gold Belong to patch.

5. high-isolation mimo antenna according to claim 1, it is characterised in that: the earth plate is to be printed on medium base Metal patch on plate (1).

6. high-isolation mimo antenna according to claim 1, it is characterised in that: the medium substrate (1) is using Jie The FR4 substrate that electric constant is 4.4 ± 3%.

7. high-isolation mimo antenna according to claim 1, it is characterised in that: the feed point of the aerial radiation end (2) Place is connected with 50 ohm of feeding microstrip lines (4).

8. described in any item high-isolation mimo antennas according to claim 1 ~ 7, it is characterised in that: be symmetrical arranged including two Aerial radiation end (2), the filtering decoupling network (3) is arranged between two aerial radiation ends (2).