CN211295378U

CN211295378U - Miniaturized high-pass filtering dual-polarization patch antenna

Info

Publication number: CN211295378U
Application number: CN201922470687.6U
Authority: CN
Inventors: 曹云飞; 章秀银; 刘亦旸; 段文; 潘咏梅
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-18
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a miniaturized high pass filtering double polarization patch antenna, including reflection floor, first layer sheetmetal and second floor sheetmetal, first layer sheetmetal with second floor sheetmetal all is four square structures that are cut away, and the centre all opens there is the gap, and the reflection floor is square structure. The gaps between the two layers of metal sheets are formed by combining a square structure and a cross structure; the square gap and the cross gap are located in the center of the metal sheet, four branches of the cross gap and four corners of the square gap point to the edge center of the metal sheet, the size of the cross gap is close to the edge of the metal sheet, and the patch antenna feeds power to the first layer of metal sheet through four centrosymmetric metal probes. The utility model discloses a dig the form of seam at parasitic paster and feed paster center, can realize fine high pass filter effect and high pass filter effect, can change the equivalent path of the electric current on the radiation paster in addition to obtain miniaturized effect.

Description

Miniaturized high-pass filtering dual-polarization patch antenna

Technical Field

The utility model relates to a radio frequency communication field especially relates to a miniaturized high pass filtering double polarization patch antenna.

Background

In the field of modern wireless communication, miniaturization and low loss are the trends in modern radio frequency front ends. While the size and efficiency of conventional single rf front-end devices such as filters, power dividers, antennas, etc. have been studied to approach the limit, as 5G communication comes and communication frequency bands and communication devices are more and more, the size and loss of the rf front-end needs to be further optimized to meet the future wireless communication requirements. The fusion design of the radio frequency front-end device is an effective solution, and particularly is based on the fusion design of an antenna array and a filter.

The utility model discloses a utility model with publication number CN201812933U discloses an integration filtering antenna, has adopted the scheme of plus circuit to filter, has realized the filtering effect on the antenna, but this kind of method can bring insertion loss and the size that plus filter circuit introduced, and the size and the efficiency improvement of whole radio frequency front end are not obvious enough.

The utility model discloses a utility model with publication number CN207217766U discloses an omnidirectional low-profile filtering patch antenna, adopts the method of introducing metal via hole and ring type gap between patch and floor and producing LC resonance to realize the good filtering effect of low-frequency stop band. Although the filter antenna has no insertion loss and circuit size introduced by an additional filter circuit, the antenna radiator needs to have a large enough size to optimize the radiation and filtering performance, the whole side length reaches 58.4mm (0.86 lambda), and the size is larger than that of a common 0.5 lambda patch antenna.

Specific documents such as Chun-Xu Mao, Steven Gao, Yi Wang, Fan Qin, Qing-Xin Chu, "Multi mode Resonator-Fed Dual-Polarized Antenna With Enhanced band With selected Selectivity," IEEE trans. Antenna Probe, VOL.63, NO.12, DECEMBER "skillfully design the filter feed network under the floor, while solving the problem of extra size of the filter circuit, the problem of insertion loss introduced by the filter is not solved, and the filter Antenna is not miniaturized, With a side length of about 0.52 λ.

SUMMERY OF THE UTILITY MODEL

In order to overcome the shortcoming and the not enough that prior art exists, the utility model provides a miniaturized high pass filtering dual polarization patch antenna, antenna self possess high pass filtering performance, and the patch length of side is only 0.3 lambda to the radiation performance and the filtering performance of antenna are all very stable.

The purpose of the utility model is realized through the following technical scheme: the utility model provides a miniaturized high pass filtering double polarization patch antenna, includes reflection floor, first layer sheetmetal and second floor sheetmetal, first layer sheetmetal with second floor sheetmetal all is four angles square structure of being cut away, and the centre all opens gapped, the reflection floor is square structure. The utility model discloses a dig the form of seam at parasitic paster and feed paster center, can realize fine high pass filtering effect and high pass filtering effect. The gap formed between the two layers of metal sheets can not only realize the miniaturization of the size of the antenna, but also move the filtering zero point introduced by the second layer of metal sheets in a high-frequency band to a low-frequency band part, thereby realizing the high-pass filtering response effect.

Preferably, a gap is formed in the middle of the first layer of metal sheet and consists of a square gap structure and a cross gap structure, and the square gap structure and the cross gap structure are both located at the center of the first layer of metal sheet.

Furthermore, four corners of the square gap structure point to the center of the edge of the first layer of metal sheet, and four branches of the cross-shaped gap structure point to the center of the edge of the first layer of metal sheet and are close to the edge.

Preferably, the gap structure formed in the middle of the second layer of metal sheets is the same as the position of the gap structure formed in the middle of the first layer of metal sheets on the metal sheets.

Preferably, the size of the gap structure formed in the middle of the second layer of metal sheets is larger than or equal to the size of the gap structure formed in the middle of the first layer of metal sheets.

Preferably, the difference between the side length of the first secondary metal sheet and the side length of the second layer of metal sheet is within 5%.

Preferably, the first layer of metal sheets is fed by four symmetrical metal probes, and the four metal probes are positioned on the diagonal line of the metal sheets.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the high-pass filtering effect and the high-pass filtering effect can be well achieved by digging the gaps in the centers of the parasitic patch and the feed patch, steep roll-off is arranged at the edge of the pass band, and good matching and stable radiation characteristics in the pass band of the antenna are achieved.

2. The equivalent path of the current on the radiating patch can be changed by digging a slit in the centers of the parasitic patch and the driving patch, thereby obtaining the effect of miniaturization.

3. The distance between the parasitic patch and the driving patch, the size of the parasitic patch and the size of the gap can be adjusted according to actual needs to control the position of the gain suppression zero point so as to change the filtering frequency band.

4. The method has the characteristics of high isolation, good frequency selectivity, stable radiation pattern and the like.

5. The structure is compact, and the PCB processing technology can be used, so that the manufacturing cost is low; because no cascaded complex filter circuit is arranged, the loss is low, and the gain of the antenna is higher; and has dual polarized radiation characteristics.

Drawings

Fig. 1 is a top view structural diagram of a miniaturized high-pass filtering dual-polarized patch antenna of the present invention;

fig. 2 is a side view and a top view of a miniaturized high-pass filtering dual-polarized patch antenna according to the present invention; wherein, figure (a) is the top view of the parasitic patch of the filtering antenna embodiment 1 of the present invention; fig. (b) is a side view of embodiment 1 of the filtering antenna of the present invention; fig. (c) is a top view of the feeding patch of embodiment 1 of the filtering antenna of the present invention;

fig. 3 is a graph showing the results of simulation of +45 degree reflection coefficient (S11), -45 degree reflection coefficient (S22) and ± 45 degree polarization isolation (S12) frequency for the embodiment 1 of the filtering antenna of the present invention;

fig. 4 is a diagram of the simulation result of ± 45 ° gain-frequency of the embodiment 1 of the filtering antenna of the present invention;

fig. 5 shows the radiation pattern of the embodiment 1 of the filtering antenna of the present invention at 0.9GHz, +45 °;

fig. 6 shows the radiation pattern of the embodiment 1 of the filtering antenna of the present invention at 0.9GHz, 45 °;

fig. 7 is a three-dimensional structure diagram of a miniaturized high-pass filtering dual-polarized patch antenna of the present invention.

The device comprises a metal reflecting plate 1, a dielectric plate to which a parasitic patch 2 is attached, a dielectric plate to which a driving patch 3 is attached, a feed probe 4, a parasitic patch 5, a driving patch 6, a slot on the parasitic patch 7 and a slot on the driving patch 8.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

As shown in fig. 1 to 2, this embodiment provides a miniaturized high-pass filtering dual-polarized patch antenna, as can be seen from fig. 1, 2, and 7, the antenna unit is disposed at the middle upper position of the metal reflection plate 1, four feeding probes 4 penetrate through the dielectric plate 3 and are welded to the driving patch 6, a pair of feeding probes 4 with opposite diagonal lines are differentially fed to form a linear polarization of +45 °, and the other pair of feeding probes 4 forms a linear polarization of-45 °.

The driving patch 6 is printed on the PCB dielectric plate 3, a gap 8 is formed in the center of the driving patch 6, the shape of the gap 8 is a square structure and a cross structure, and the gap 8 changes current distribution, so that the patch antenna is miniaturized.

The parasitic patch 5 is printed on the single-sided PCB medium plate 2, a gap 7 is formed in the center of the parasitic patch 5, and the gap 7 is formed by a square structure and a cross structure.

The PCB dielectric plate 2 is positioned right above the PCB dielectric plate 3, the sizes of the gap 7 and the gap 8 and the distance between the PCB dielectric plate 3 and the PCB dielectric plate 2 are adjusted, the filtering zero point of the parasitic patch 5 introduced in a high-frequency band can be moved to a low-frequency band part, and a high-pass filtering response effect is achieved.

Fig. 3 is a graph showing the simulation results of return loss-polarization isolation-frequency in this embodiment. The filtering antenna of the specific embodiment 1 still has two resonance modes in the 820MHz to 980MHz frequency band, and S11 is below-10 dB, so that good matching of the working frequency band is realized. The polarization isolation reaches below-37.8 dB in the working frequency band, and good isolation is realized.

Fig. 4 is a diagram showing the simulation result of gain versus frequency in this embodiment. The simulation gain of the filtering antenna of the specific embodiment 1 is 8.2dB to 9.09dB in the frequency band from 820MHz to 980 MHz. And a radiation zero point is arranged at 730MHz, so that better out-of-band rejection is realized.

As shown in fig. 5, which is a graph of the simulation result of the radiation pattern with the linear polarization of +45 ° of 900MHz in the present embodiment, the radiation pattern main polarization radiation pattern is not distorted, and has a relatively low cross polarization.

As shown in fig. 6, which is a graph of simulation results of 900 MHz-45 ° linear polarization patterns of the present embodiment, the main polarization patterns of the patterns are not distorted and have relatively low cross polarization.

The miniaturized high-pass filtering dual-polarized patch antenna integrates the filtering characteristic and the radiation characteristic, has the filtering performance, steep passband edge, obvious sideband suppression and good frequency selection characteristic, does not need an additional filtering loss circuit, and overcomes the defects of large loss and large volume when the filtering antenna is designed by the additional filtering circuit. The filter passband can cover the 820MHz-960MHz frequency band, and the passband gain is flat, which can realize higher gain, restrain the adjacent frequency interference and improve the performance of the base station transceiver. Meanwhile, a parasitic patch and a cross gap are introduced, and a low-frequency radiation suppression zero point is introduced, so that the gain of the frequency band at the lower side of the passband is rapidly reduced, and the zero point function generates a high-pass filtering characteristic.

The whole structure of the miniaturized high-pass filtering dual-polarized patch antenna mainly comprises a metal patch, a metalized via hole, a dielectric plate through hole and a cross-shaped groove, and the miniaturized high-pass filtering dual-polarized patch antenna is simple in structure, simple and convenient to design and capable of being processed by adopting a low-price PCB technology.

To sum up, the utility model is suitable for the wireless mobile communication multifrequency base station antenna field, can be applied to the receiving and transmitting equipment of various wireless communication systems, because the utility model discloses a filtering characteristic, be particularly suitable for work 820 and 980 MHz's base station antenna in the open complicated multifrequency section multi-standard communication scene; benefit from filtering characteristic and radiation characteristic's integration simultaneously, and the utility model has the characteristics of it is miniaturized, the utility model discloses also be applicable to the integration and the integration of wireless mobile communication system equipment, reduce the designing requirement, improve the anti adjacent channel interference's of communication equipment ability.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. The utility model provides a miniaturized high pass filtering dual polarization patch antenna which characterized in that, is including reflection floor, first layer sheetmetal and second floor sheetmetal, first layer sheetmetal with second floor sheetmetal all is four angles square structure cut off, and the centre all opens there is the gap, reflection floor is square structure.

2. The miniaturized high-pass filtering dual-polarized patch antenna according to claim 1, wherein a gap is formed in the middle of the first layer of metal sheets, the gap is composed of a square gap structure and a cross-shaped gap structure, and the square gap structure and the cross-shaped gap structure are both located in the center of the first layer of metal sheets.

3. The miniaturized high-pass filtering dual-polarized patch antenna according to claim 2, wherein four corners of the square slot structure are directed to the center of the edge of the first layer of metal sheet, and four branches of the cross slot structure are also directed to the center of the edge of the first layer of metal sheet and are close to the edge.

4. The miniaturized high-pass filtered dual-polarized patch antenna according to claim 1, wherein the slot structure formed in the middle of the second layer of metal sheets is located at the same position on the metal sheets as the slot structure formed in the middle of the first layer of metal sheets.

5. The miniaturized high-pass filtered dual-polarized patch antenna according to claim 1, wherein the size of the slot structure formed in the middle of the second layer of metal sheets is larger than or equal to the size of the slot structure formed in the middle of the first layer of metal sheets.

6. The miniaturized high-pass filtered dual-polarized patch antenna according to claim 5, wherein the side length of the first layer of metal sheets is within 5% of the side length of the second layer of metal sheets.

7. The miniaturized high-pass filtered dual-polarized patch antenna according to claim 1, wherein said first layer of metal sheets is fed by four symmetrical metal probes located on the diagonals of the metal sheets.