CN113131198A

CN113131198A - Low-interference broadband filter oscillator and antenna array

Info

Publication number: CN113131198A
Application number: CN202110332607.XA
Authority: CN
Inventors: 岳彩龙; 高永杰; 付聪; 刘木林; 吴中林
Original assignee: Tongyu Communication Inc
Current assignee: Tongyu Communication Inc
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-07-16

Abstract

The utility model provides a low interference wide band filtering oscillator, include from last to the radiation surface that connects gradually down, balun and ground connection, the radiation surface comprises four oscillator arms that are the quadrature setting, four oscillator arms constitute the dual polarization, the head end upper surface of each oscillator arm all is equipped with a feed point that is connected with balun, a coupling filter structure that is located oscillator arm lower surface is respectively coupled to feed point both sides below, feed point and coupling filter structure form first lumped LC circuit, the terminal both sides of feed point connect gradually a set of second lumped LC circuit and the distributed LC circuit that establishes ties respectively, the not end coupling of two distributed LC circuits that are located on same oscillator arm connects. The special filter structure of the antenna is particularly used for a 4G multi-frequency multi-array antenna and a 4G +5G dual-system antenna, the compact antenna which is placed in an interweaving mode can keep the performance of a single-frequency antenna, meanwhile, the size of the antenna is controlled, and the cost is reduced.

Description

Low-interference broadband filter oscillator and antenna array

Technical Field

The invention relates to the technical field of antennas, in particular to a low-interference broadband filter oscillator and an antenna array.

Background

In the case of the rapid development of the communication industry, both domestic and foreign, operators face a serious problem of application cost. The 4G +5G joint networking scheme is undoubtedly the best choice for improving the base station capacity and the user experience at present. For antenna manufacturers, the 4G +5G multi-frequency multi-array antenna has a complex structure, a large antenna size and high cost, and if the size is compressed, coupling influence among different frequency bands is easily caused, and the use quality is reduced.

Therefore, how to solve the size problem of the multi-frequency multi-array antenna and how to solve the inter-array interference are technical problems of antenna manufacturers. The key to solve the problem lies in how to realize the decoupling between the antenna element units, so that the mutual influence can be eliminated when the units of different frequency bands are used in an interweaving way.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a low-interference broadband filter oscillator and an antenna array, which are particularly used for a 4G multi-frequency multi-array antenna and a 4G +5G dual-system antenna, and the special filter structure thereof can enable the compact antenna placed in an interlaced manner to maintain the performance of a single-frequency antenna, and simultaneously, the size of the antenna is controlled, and the cost is reduced.

In order to realize the technical purpose, the adopted technical scheme is as follows: a low-interference broadband filter oscillator comprises a radiation surface, a balun and a grounding seat which are sequentially connected from top to bottom, wherein the radiation surface is composed of four oscillator arms which are orthogonally arranged, the four oscillator arms are symmetrically arranged according to a diagonal line, two oscillator arms positioned on one diagonal line form one oscillator polarization, and two oscillator arms positioned on the other diagonal line form the other oscillator polarization;

the upper surface of the head end of each oscillator arm is provided with a feed point connected with balun, the lower parts of the two sides of the tail end of the feed point are respectively coupled with a coupling filter structure positioned on the lower surface of the oscillator arm, the feed point and the coupling filter structure form a first lumped LC circuit, the two sides of the tail end of the feed point are respectively and sequentially connected with a group of second lumped LC circuits and distributed LC circuits which are connected in series, and the tail ends of the two distributed LC circuits positioned on the same oscillator arm are coupled and connected.

The oscillator arm is made of PCB double-layer copper-clad material.

The coupling filter structure is composed of a high-resistance line and a first capacitor which are connected in series.

The distributed LC circuit is a metal microstrip line with a gradually changed shape, and the metal microstrip line is changed from a head end to a tail end from small to big.

The feed point is a triangular structure extending outwards from the middle of the radiating surface.

The second lumped LC circuit is composed of a second capacitor and a first inductor which are alternately connected in series.

The first inductor is a bent metal microstrip line.

The metal microstrip lines are bent towards the diagonal direction.

An antenna array comprises a reflecting plate, a plurality of high-frequency oscillators and a plurality of low-interference broadband filter oscillators, wherein the end surfaces of the low-interference broadband filter oscillators are higher than the end surfaces of the high-frequency oscillators, and the high-frequency oscillators and the low-interference broadband filter oscillators are arranged on the reflecting plate.

The invention has the beneficial effects that: the oscillator enables the multi-frequency multi-array combined antenna array to avoid interference with an adjacent array through a method of jointly using the lumped LC circuit and the distributed LC circuit, and the special multi-filtering structure of the multi-frequency multi-array combined antenna array can directly cover the upper side of the high-frequency array, so that the size of the antenna is effectively reduced, the performance of an antenna interweaving array is improved, and the multi-frequency multi-array combined antenna array is simple in structure, convenient to install and low in cost.

The broadband filter oscillator is used based on a base station antenna, when the broadband filter oscillator is used in a multi-frequency multi-array antenna, the interference between systems can be effectively reduced, the array can be compactly placed, the size of the antenna is reduced, the operation cost is reduced, the capacity of the base station is improved, and the user experience is improved.

Drawings

FIG. 1 is a schematic view of a radiation plane of a low-interference broadband filter oscillator according to the present invention;

FIG. 2 is a schematic diagram of a side view of a low-interference broadband filter oscillator according to the present invention;

FIG. 3 is a schematic diagram of a back side structure of a radiation surface of a low-interference broadband filter oscillator according to the present invention;

FIG. 4 is a schematic diagram of a filter structure of a single vibrator arm on a radiation surface according to the present invention;

fig. 5 is a partial view of an antenna array of the present invention;

FIG. 6 is an array pattern using filter elements in accordance with the present invention;

fig. 7 is an array pattern using unfiltered elements of the present invention.

Detailed Description

A low-interference broadband filter oscillator comprises a radiation surface 1, a balun 2 and a grounding seat 3 which are sequentially connected from top to bottom; the front surface of the radiation surface 1 is shown in figure 1 and is positioned at the top of the oscillator, the radiation surface is in a cross shape and has the same principle with a half-wave oscillator, and the balun 2 is positioned in the middle of the oscillator and is used for feeding and supporting the radiation surface. As shown in fig. 2, balun adopts a PCB double-sided copper-clad material, one side is an impedance-matched microstrip line, and the other side is a ground strip. And a grounding seat 3 is arranged below the balun 2, and the grounding seat 3 is placed on a reflecting plate of the antenna and forms a coupling grounding mode with the reflecting plate.

The radiation surface 1 is composed of four vibrator arms 1a, 1b, 1c and 1d which are orthogonally arranged, the four vibrator arms 1a, 1b, 1c and 1d are symmetrically arranged according to a diagonal line, two vibrator arms 1a and 1c positioned on one diagonal line form a vibrator polarization, two vibrator arms 1b and 1d positioned on the other diagonal line form another vibrator polarization, and therefore the vibrator comprises a +/-45-degree dual polarization.

As shown in fig. 3 and 4, the four feeding points are located at the middle position of the radiation surface 1, the coupling filter structures 4 located on the lower surface of the oscillator arm are respectively coupled below two sides of the tail end of the feeding point 101, the feeding point 101 and the coupling filter structures 4 form a first lumped LC circuit, and the feeding point 101 and the coupling filter structures 4 are coupled and connected through a dielectric plate, so that an inductor and capacitor series effect is generated, thereby forming a lumped LC circuit and generating an inhibiting effect on electromagnetic waves in a specific range.

As shown in fig. 4, a set of second lumped LC circuit 5 and distributed LC circuit 6 connected in series are sequentially connected to both sides of the end of the feeding point, respectively, and the ends of the two distributed LC circuits located on the same oscillator arm are coupled. The second lumped LC circuit is located in the middle of the oscillator arm and used for filtering in a wider frequency band, and after the lumped LC circuit is connected with the distributed LC circuits in series, the filtering effect of the oscillator is obviously improved compared with an independent lumped filtering structure or a distributed filtering structure, and the bandwidth of the unit is improved by 30-40% compared with that of a conventional unit.

The oscillator arm is made of PCB double-layer copper-clad material. Or made of a plastic bracket matched with a copper sheet.

As shown in fig. 3, the coupling filter structure is composed of a high-resistance line 401 and a first capacitor 402 connected in series.

As shown in fig. 4, the distributed LC circuit is a metal microstrip line with a gradually changing shape, and the metal microstrip line is gradually increased from the head end to the tail end.

The feeding point 101 is a triangular structure extending outward from the middle of the radiating surface for expanding the bandwidth and limiting the bandwidth of the unit.

The second lumped LC circuit consists of a second capacitor 501 and a first inductor 502 connected in series alternately.

The first inductor 502 is a metal microstrip line with a bent shape.

The metal microstrip lines are bent towards the diagonal direction, so that the shape of the oscillator can be reduced, and a good filtering effect can be realized.

An antenna array comprises a reflecting plate, a plurality of high-frequency oscillators and a plurality of low-interference broadband filter oscillators, wherein the end faces of the low-interference broadband filter oscillators are higher than the end faces of the high-frequency oscillators, and the high-frequency oscillators and the low-interference broadband filter oscillators are arranged on the reflecting plate.

Fig. 5 shows an embodiment of the broadband filter element of the present invention used in an antenna with a multi-frequency multi-array, after the filter element is used, the high-frequency pattern of the array is shown in fig. 6, and the high-frequency pattern of the filter element is not shown in fig. 7. Obviously, after the filter oscillator is used, the directional diagram of the high-frequency array is more convergent, and the average gain is higher.

More embodiments can be produced by adjusting the number and positions of the distributed LC circuits or lumped LC circuits on the radiating surface of the oscillator, so that the corresponding designs and products are all included in the scope of protection of this patent under the guidance of this patent.

Claims

1. a low-interference broadband filter vibrator, comprising a radiating surface, a balun and a grounding seat connected in sequence from top to bottom, it is characterized in that: the radiating surface is made up of four vibrator arms that are set orthogonally, and the four vibrator arms press The diagonal lines are symmetrically arranged, and the two oscillator arms located on one diagonal line form one oscillator polarization, and the two oscillator arms located on the other diagonal line form the other oscillator polarization;

The upper surface of the head end of each vibrator arm is provided with a feeding point connected to the balun, and a coupling filter structure located on the lower surface of the vibrator arm is coupled below the two sides of the feeding point. The filtering structure forms a first lumped LC circuit, and a group of second lumped LC circuits and a distributed LC circuit in series are respectively connected on both sides of the end of the feeding point. The two distributed LC circuits are located on the same vibrator arm. terminal coupling connection.

2 . The low-interference broadband filter vibrator according to claim 1 , wherein the vibrator arm is made of PCB double-layer copper-clad material. 3 .

3 . The low-interference broadband filter oscillator according to claim 1 , wherein the coupling filter structure is composed of a series-connected high-resistance line and a first capacitor. 4 .

4 . The low-interference broadband filter oscillator according to claim 1 , wherein the distributed LC circuit is a metal microstrip line with a gradient shape, and the metal microstrip line increases from small to large from the beginning to the end. 5 .

5 . The low-interference broadband filter oscillator according to claim 1 , wherein the feeding point is a triangular structure extending from the middle of the radiation surface to the outside. 6 .

6 . The low-interference broadband filter oscillator according to claim 1 , wherein the second lumped LC circuit is composed of a second capacitor and a first inductor which are alternately connected in series. 7 .

7 . The low-interference broadband filter oscillator according to claim 6 , wherein the first inductor is a metal microstrip line in a bent shape. 8 .

8 . The low-interference broadband filter oscillator according to claim 7 , wherein the metal microstrip line is bent in a diagonal direction. 9 .

9. An antenna array, comprising a reflector and several high-frequency oscillators, is characterized in that: also comprising several low-interference broadband filter oscillators as described in any one of claims 1-8, the end face of the low-interference broadband filter oscillator is higher than The end faces of the several high-frequency vibrators, the high-frequency vibrators and the low-interference broadband filter vibrators are arranged on the reflector.