CN111864366A

CN111864366A - Antenna structure for improving cross polarization performance of dual-polarization microstrip antenna

Info

Publication number: CN111864366A
Application number: CN202010725578.9A
Authority: CN
Inventors: 刘中华
Original assignee: Shanghai Xuanya Technology Co ltd
Current assignee: Shanghai Xuanya Technology Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2020-10-30
Anticipated expiration: 2040-07-24
Also published as: CN111864366B

Abstract

The invention discloses an antenna structure for improving cross polarization performance of a dual-polarized microstrip antenna, which comprises a microwave medium substrate, a microstrip feeder, a deployment branch node, a square metal patch, a metal floor, a metal cylinder and a feed probe, wherein the microstrip feeder, the deployment branch node and the square metal patch are arranged on the upper surface of the microwave medium substrate; the cross polarization characteristic can be adjusted by adjusting the radius and the height of the metal cylinder, and the metal cylinder is detachable, so that the debugging and the real-time adjustment of actual products are facilitated.

Description

Antenna structure for improving cross polarization performance of dual-polarization microstrip antenna

Technical Field

The invention relates to the technical field of antennas, in particular to an antenna structure for improving the cross polarization performance of a dual-polarization microstrip antenna.

Background

With the development of mobile communication technology, MIMO (Multiple-Input Multiple-output) multi-antenna technology becomes a key technology for improving communication quality and efficiency in Wi-Fi and TD-LTE communication. The polarization diversity is realized by utilizing the dual-polarized antenna technology, the polarization multiple access communication can be carried out, and the throughput and the utilization rate of a channel are improved. This requires the antenna unit to have excellent cross-polarization performance, otherwise a serious cross-polarization level will cause the signal of the cross-polarization channel to affect the main polarization channel, and further affect the selection of the channel and the transmission and reception of data information.

Electromagnetic waves are used for transmitting information and have a main channel and a secondary channel, the main channel being co-polarized and the secondary channel being necessarily defined as cross-polarized. Polarization refers to polarization of a radiated electric wave in a maximum radiation direction, which is defined as a trajectory of an end point movement of an electric field vector in the maximum radiation direction. Due to the physical structure of the antenna itself, etc., the electric field vector of the far field radiated by the antenna has a component in the orthogonal direction in addition to the component in the desired direction, which is the cross polarization of the antenna.

The microstrip patch antenna has the advantages of wide beam, low profile, light weight, small volume, low cost, convenience for integration and array formation, and the like, and is widely researched and applied. Cross polarization itself is a difficult point for microstrip antennas, and especially for dual-polarized antennas, microstrip feed lines of two polarization channels are connected to the same square metal patch, so that the polarization purity of the antenna is not high, and the problems of mutual crosstalk, insufficient isolation and the like exist.

Disclosure of Invention

The present invention is directed to an antenna structure for improving cross polarization performance of a dual-polarized microstrip antenna, so as to solve the above-mentioned problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides an improve dual polarization microstrip antenna cross polarization performance's antenna structure, includes microwave medium base plate, microstrip feeder, allotment stub, square metal paster, metal floor, metal cylinder and feed probe, microstrip feeder, allotment stub, square metal paster set up in the upper surface of microwave medium base plate, metal floor sets up in the lower surface of microwave medium base plate, allotment stub, feed probe are provided with two sets ofly, the allotment stub is connected with square metal paster, the feed probe is connected with the allotment stub through the microstrip feeder.

Preferably, a through hole is formed in the center of the square metal patch, a metal cylinder is arranged in the through hole, and the metal cylinder is fixed on the metal floor.

Preferably, the aperture of the through hole is larger than the diameter of the metal cylinder.

Preferably, the surface of the microwave dielectric substrate is provided with mounting holes corresponding to the metal cylinders.

Preferably, the installation hole and the metal cylinder are in interference fit.

Preferably, the metal cylinder is fixed on the metal floor by bonding.

Preferably, the metal cylinder is fixedly installed on the metal floor by a locking nut.

Preferably, the metal cylinder passes through installation mechanism to be fixed on the metal floor, installation mechanism includes a fixed section of thick bamboo, a fixed section of thick bamboo sets up in the metal floor bottom, the screw hole has been seted up to a fixed section of thick bamboo bottom, install the screw rod in the screw hole, the knob is installed to the screw rod bottom, and the top is rotated and is connected with the turning block, a plurality of connecting rods are installed in the rotation of turning block top, the inside a plurality of spouts that is provided with of a fixed section of thick bamboo, a plurality of spouts encircle the central axis evenly distributed of a fixed section of thick bamboo, slidable mounting has the latch segment in the spout, the one end that fixed section of thick bamboo central axis was kept away from to.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the cross polarization performance of the antenna can be improved only by mounting the metal cylinder after the hole is formed in the center of the metal patch of the original dual-polarized antenna, the improvement effect is the same for two channels, and meanwhile, the gain of the dual-polarized microstrip antenna is increased; the cross polarization characteristic can be adjusted by adjusting the radius and the height of the metal cylinder, and the metal cylinder is detachable, so that the debugging and the real-time adjustment of actual products are facilitated.

Drawings

Fig. 1 is a top view of an antenna structure for improving cross-polarization performance of a dual-polarized microstrip antenna;

fig. 2 is a schematic perspective view of an antenna structure for improving cross polarization performance of a dual-polarized microstrip antenna;

fig. 3 is a schematic structural diagram of a mounting mechanism in an antenna structure for improving cross-polarization performance of a dual-polarized microstrip antenna;

fig. 4 is a radiation characteristic diagram of an antenna structure without a metal cylinder mounted;

fig. 5 is a radiation characteristic diagram of an antenna structure for improving cross-polarization performance of a dual-polarized microstrip antenna.

In the figure: 1-microwave dielectric substrate, 2-microstrip feeder line, 3-allocation branch node, 4-square metal patch, 5-metal floor, 6-metal cylinder, 7-feed probe, 8-through hole, 9-fixed cylinder, 10-threaded hole, 11-screw rod, 12-knob, 13-chute, 14-spring, 15-locking block and 16-connecting rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1 to 5, the present invention provides a technical solution: the utility model provides an improve dual polarization microstrip antenna cross polarization performance's antenna structure, includes microwave medium base plate 1, microstrip feeder 2, allotment stub 3, square metal paster 4, metal floor 5, metal cylinder 6 and feed probe 7, microstrip feeder 2, allotment stub 3, square metal paster 4 set up in the upper surface of microwave medium base plate 1, metal floor 5 sets up in the lower surface of microwave medium base plate 1, allotment stub 3, feed probe 7 are provided with two sets ofly, allotment stub 3 is connected with square metal paster 4, feed probe 7 is connected with allotment stub 3 through microstrip feeder 2.

Through-hole 8 has been seted up to the positive center department of square metal patch 4, be provided with metal cylinder 6 in the through-hole 8, metal cylinder 6 is fixed on metal floor 5, metal cylinder 6's height and radius are adjustable, can adjust the cross polarization value of antenna through adjustment height and radius.

The aperture of the through hole 8 is larger than the diameter of the metal cylinder 6.

The surface of the microwave medium substrate 1 is provided with a mounting hole corresponding to the metal cylinder 6.

And the mounting hole is in interference fit with the metal cylinder 6.

The metal column 6 is fixed on the metal floor 5 by bonding.

The specific manufacturing process of the invention is as follows, firstly, the dielectric constant and the plate thickness of the selected microwave dielectric substrate 1 are determined according to the requirements. The dielectric constant affects the size of the radiation pattern, and the size of the square metal patch 4 and the thickness of the microwave dielectric substrate 2 determine the operating frequency of the antenna. The radius of the opening 8 in the center of the square metal patch 4 and the radius and height of the metal cylinder 6 influence the cross polarization of the antenna, and the optimal cross polarization characteristic is obtained by adjusting and selecting a proper amount of the opening 8 in the center of the square metal patch 4 and the metal cylinder 6. Finally, the voltage standing wave ratio performance of the antenna can be optimized at the working frequency by adjusting the adjusting branch node 3.

Example two

The difference from the first embodiment is that: the metal cylinder 6 is fixedly mounted on the metal floor 5 through a locking nut.

EXAMPLE III

The difference from the first embodiment is that: the metal cylinder 6 is fixed on the metal floor 5 through an installation mechanism, the installation mechanism comprises a fixed cylinder 9, the fixed cylinder 9 is arranged at the bottom end of the metal floor 5, a threaded hole 10 is formed in the bottom end of the fixed cylinder 9, a screw rod 11 is installed in the threaded hole 10, a knob 12 is installed at the bottom end of the screw rod 11, a rotating block is rotatably connected to the top end of the screw rod 11, a plurality of connecting rods 16 are rotatably installed at the top end of the rotating block, a plurality of sliding grooves 13 are formed in the fixed cylinder 9, the sliding grooves 13 are uniformly distributed around the central axis of the fixed cylinder 9, a locking block 15 is slidably installed in the sliding grooves 13, one end, far away from the central axis of the fixed cylinder 9, of the locking block 15 is connected with the inner wall of the sliding grooves 13 through springs 14, the top end of each connecting rod 16 is rotatably connected with the locking block 15, the knob, thereby creating a loosening or locking action for the metal cylinder 6.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an improve antenna structure of dual polarization microstrip antenna cross polarization performance, includes microwave dielectric substrate (1), microstrip feeder (2), allotment stub (3), square metal paster (4), metal floor (5), metal cylinder (6) and feed probe (7), its characterized in that: the microwave dielectric substrate is characterized in that the microstrip feeder line (2), the allocation branch node (3) and the square metal patch (4) are arranged on the upper surface of the microwave dielectric substrate (1), the metal floor (5) is arranged on the lower surface of the microwave dielectric substrate (1), the allocation branch node (3) and the feed probe (7) are provided with two groups, the allocation branch node (3) is connected with the square metal patch (4), and the feed probe (7) is connected with the allocation branch node (3) through the microstrip feeder line (2).

2. An antenna structure for improving cross-polarization performance of a dual polarized microstrip antenna according to claim 1 wherein: the positive center department of square metal paster (4) has seted up through-hole (8), be provided with metal cylinder (6) in through-hole (8), metal cylinder (6) are fixed on metal floor (5).

3. An antenna structure for improving cross-polarization performance of a dual polarized microstrip antenna according to claim 2, wherein: the aperture of the through hole (8) is larger than the diameter of the metal cylinder (6).

4. An antenna structure for improving cross-polarization performance of a dual polarized microstrip antenna according to claim 3 wherein: the surface of the microwave medium substrate (1) is provided with a mounting hole corresponding to the metal cylinder (6).

5. An antenna structure for improving cross-polarization performance of a dual polarized microstrip antenna according to claim 4, wherein: the mounting hole and the metal cylinder (6) are in interference fit.

6. An antenna structure for improving cross-polarization performance of a dual polarized microstrip antenna according to claim 5 wherein: the metal column (6) is adhered and fixed on the metal floor (5).

7. An antenna structure for improving cross-polarization performance of a dual polarized microstrip antenna according to claim 5 wherein: the metal cylinder (6) is fixedly arranged on the metal floor (5) through a locking nut.

8. An antenna structure for improving cross-polarization performance of a dual polarized microstrip antenna according to claim 5 wherein: the metal cylinder (6) is fixed on a metal floor (5) through an installation mechanism, the installation mechanism comprises a fixed cylinder (9), the fixed cylinder (9) is arranged at the bottom end of the metal floor (5), a threaded hole (10) is formed in the bottom end of the fixed cylinder (9), a screw rod (11) is installed in the threaded hole (10), a knob (12) is installed at the bottom end of the screw rod (11), a rotating block is rotatably connected to the top end of the knob, a plurality of connecting rods (16) are rotatably installed at the top end of the rotating block, a plurality of sliding grooves (13) are formed in the fixed cylinder (9), the plurality of sliding grooves (13) are uniformly distributed around the central axis of the fixed cylinder (9), a locking block (15) is slidably installed in each sliding groove (13), one end, far away from the central axis of the fixed cylinder (9), of each locking block (15, the top end of the connecting rod (16) is rotatably connected with the locking block (15).