CN213878401U

CN213878401U - 700M-900M shunt for base station antenna

Info

Publication number: CN213878401U
Application number: CN202022592977.0U
Authority: CN
Inventors: 陈春洲; 王徐军; 卜安涛; 苏学伟
Original assignee: Nanjing Aby Rf Technology Co ltd
Current assignee: Nanjing Aby Rf Technology Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-08-03
Anticipated expiration: 2030-11-11

Abstract

The utility model discloses a 700M-900M branching unit for base station antenna, including a low frequency branching unit PCB, be equipped with an input port and two output ports 700M, 900M. The first microstrip line, the second microstrip line and the third microstrip line are respectively connected with the input port and the two output ports; the first microstrip line is split into a second microstrip line and a third microstrip line, the second microstrip line is provided with three open-circuit branches, the third microstrip line is provided with two open-circuit branches, and the microstrip line is further provided with a widened branch. The input port can be connected with the low-frequency radiation unit of the base station antenna through a radio-frequency coaxial cable, the splitter splits and filters low-frequency broadband signals, and the 700M and 900M output ports respectively correspond to and output 703-798MHz and 885-960MHz radio-frequency signals through connecting the radio-frequency coaxial cable. The utility model provides an use the compatible use problem that realizes two kinds of different demand frequency channels with a set of radiating element among the base station antenna, and simple structure, size are little, do benefit to wiring, low cost, be fit for mass production.

Description

700M-900M shunt for base station antenna

Technical Field

The utility model belongs to the technical field of wireless communication, in particular to 700M-900M branching unit is used to base station antenna.

Background

With the rapid development of mobile communication, the complexity of the coverage environment of a base station cell is different, the number of users is increased, and the capacity of the existing base station cell is difficult to meet the increasing demand of the users, so that the types of antennas required by the base station coverage cell are more and more, the range of the covered frequency band is wider and wider, the use of the multi-band and multi-port antenna is more and more urgent, but the size and the weight of the antenna are limited, and the resource of a station suspended by the antenna is limited. Cost and resource limitations have increased the strong demand for efficient, compact radiating arrays. At present, 700M and 900M signal output needs to be realized by using two groups of arrays and feed networks, and the problems of large antenna volume, heavy weight, high cost and the like exist. The utility model discloses aim at using same a set of radiation array and feed network, through this splitter to wide band radio frequency signal's split and filtering, only export the radio frequency signal that 700M and 900M two sections needs to use the compatible use problem that uses same a set of radiating element to realize two kinds of different demand frequency channels in the base station antenna to solved.

SUMMERY OF THE UTILITY MODEL

The purpose of the invention is as follows: an object of the utility model is to provide a 700M-900M branching unit for base station antenna, to wide band radio frequency signal's split and filtering, only export the radio frequency signal that 700M and 900M two sections needs to use the compatible use problem that the same a set of radiating element realized two kinds of different demand frequency channels among the base station antenna to having solved, make the operation simpler, base station antenna volume dwindles greatly, effective reduce cost.

The technical scheme is as follows: in order to solve the technical problem, the utility model adopts the following technical scheme:

A700M-900M splitter for a base station antenna comprises a low-frequency splitter PCB which only outputs 700M and 900M two sections of required radio frequency signals; the front surface of a medium substrate of the low-frequency splitter PCB is provided with a radio-frequency signal input port IN, a 700M output port and a 900M output port, and a first microstrip line, a second microstrip line and a third microstrip line which are respectively connected with the input port IN, the 700M output port and the 900M output port; the first microstrip line is split into a second microstrip line and a third microstrip line, the second microstrip line is provided with three open-circuit branches, and the third microstrip line is provided with two open-circuit branches; the first microstrip line is in a bent line shape, and the second microstrip line and the third microstrip line are in a straight line shape; the back surface and the front surface of the dielectric substrate are communicated through the metallized through holes.

Further preferably, the second microstrip line and the third microstrip line are arranged in parallel; two open-circuit branches of the second microstrip line are arranged on the outer side, and one open-circuit branch is arranged on the inner side; one section branch knot of opening a way of third microstrip line is located the outside, and one section branch knot of opening a way is located the inboard to set up with the branch knot of opening a way of second microstrip line staggers, accomplish to reduce PCB panel total area when guaranteeing the performance, reduce cost.

Preferably, the open-circuit branches of the second microstrip line and the third microstrip line are linear and arranged on two sides of the second microstrip line and the third microstrip line in parallel.

Preferably, the first microstrip line is provided with a first widened branch, and the second microstrip line is provided with a second widened branch at the starting end and the tail end; and a widened branch node is arranged at the starting end of the third microstrip line.

Further preferably, the shunt is fixed to the reflecting plate by pressing a rivet through a rivet hole.

Further preferably, the second microstrip line outputs 703-798MHz signals at the 700M output port; the third microstrip line outputs 885-960MHz signal at the 900M output port.

Further preferably, corresponding pad sites are reserved on the back of the dielectric substrate of the low-frequency splitter PCB near the radio-frequency signal input port, the 700M output port and the 900M output port respectively and are used for welding and fixing the radio-frequency coaxial cable and the splitter.

Further preferably, an arrow is arranged on the back of the dielectric substrate of the low-frequency splitter PCB, and the arrow points to the direction of the base station antenna connector.

Has the advantages that: the utility model discloses a 700M-900M branching unit for base station antenna can solve and need use two sets of arrays and feed network at present to realize 700M and 900M signal output, and the antenna volume is big, the weight is heavy, problem with high costs, use same set of radiation array and feed network now, through this branching unit to wide band radio frequency signal's split and filtering, only export the radio frequency signal of 700M and two sections needs of 900M to use the compatible use problem that realizes two kinds of different demand frequency channels with a set of radiating element in the base station antenna to solve. The operation is simpler, the volume of the base station antenna is greatly reduced, the material cost, the installation cost and the operation cost are greatly reduced, and the radiation performance is not influenced. The utility model discloses a branching unit makes the radiation array structure of antenna succinct, the small in size, do benefit to the installation wiring, with low costs, be fit for batch production.

Drawings

FIG. 1 is a schematic diagram of a front microstrip line of the present invention;

fig. 2 is a schematic diagram of the back microstrip line of the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

As shown IN fig. 1, the embodiment of the present invention discloses a 700M-900M splitter for a base station antenna, wherein the front surface of the dielectric substrate 110 of the low frequency splitter PCB board is provided with 3 circular microstrip line ports, which are a radio frequency signal input port IN101, a 700M output port 102 and a 900M output port 103. The first microstrip line bent and bent along the input port IN101 is connected, then the microstrip line is split into a second microstrip line and a third microstrip line, the second microstrip line is provided with 3 sections of open-

circuit branches

104, 105 and 106, the two sections of open-circuit branches are arranged on the outer side, the one section of open-circuit branch is arranged on the inner side, and 703-798MHz signals are output at the 700M output port 102. The third microstrip line has 2

open branches

107 and 108, one open branch is on the outside and one open branch is on the inside, and outputs 885-960MHz signal at 900M output port 103. The open-circuit branches of the second microstrip line and the third microstrip line are staggered, so that the total area of the PCB is reduced while the performance is ensured, and the cost is reduced. The back surface and the front surface of the dielectric substrate are communicated through the metallized through holes. The splitter presses rivets through 6 rivet holes and is fixed on the reflecting plate.

In order to improve the performance of the splitter, the widened branches 109 are arranged on the bent and bent lines of the first microstrip line, and the length and the width of the widened branches 109 are adjusted to improve the standing wave influence on the output ports 700M and 900M of the splitter. The widened

branches

110 and 111 are arranged on the second microstrip line, and the length and the width of the widened

branches

110 and 111 are adjusted to improve the standing wave influence on the output port 700M of the splitter. By adjusting the length size of the tail end of the open-circuit branch 106, the insertion loss influence on the output port 700M of the splitter is improved. The open-

circuit branches

104, 105 and 106 play a role in filtering, and the function of blocking low-frequency pass 703-798MHz signals can be realized by adjusting the length and the width of three open-circuit branch microstrip lines. The widened stub 112 is arranged on the third microstrip line, and the length and the width of the widened stub 112 are adjusted, so that the standing wave influence on the output port 900M of the splitter is improved. By adjusting the length of the tail end of the open-circuit branch 108, the influence on the insertion loss of the splitter output port 900M is improved. The open-

circuit branches

107 and 108 play a role in filtering, and the function of blocking low-frequency pass 885-960MHz signals can be realized by adjusting the length and the width of the two sections of open-circuit branch microstrip lines. Through adjusting the second microstrip line or the third microstrip line, the standing wave of the second microstrip line and the third microstrip line on the respective corresponding frequency bands is less than or equal to 1.38, the inter-band isolation is less than or equal to-25 dB, and the insertion loss is less than or equal to-1 dB.

As shown IN fig. 2, the back 208 of the dielectric substrate of the low frequency splitter PCB board of the embodiment of the present invention is provided with 3 circle center lines, which are the rf signal input ports IN201, 703 and 798MHz output ports 202 and 885 and 960MHz output ports 203, respectively. And

corresponding pad sites

204, 205 and 206 are reserved near each circle center line and are used for welding and fixing the radio frequency coaxial cable and the splitter PCB. Arrow 207 points in the direction of the base station antenna connector. The back surface and the front surface of the dielectric substrate are communicated through the metallized through holes.

The embodiment of the utility model discloses a 700M-900M branching unit for base station antenna makes the wide band signal in the same group of radiating element divide into two, through this branching unit to radiofrequency signal's split and filtering, only export the radiofrequency signal that 700M and 900M two sections needs, thereby the compatible use problem that uses the same group of radiating element to realize two kinds of different demand frequency channels in the base station antenna has been solved, the operation is simpler, base station antenna volume dwindles greatly, material cost, installation cost, running cost greatly reduced, radiation performance is not influenced.

The embodiment of the utility model discloses a 700M-900M shunt for base station antenna, branch knot 104 opens a way, 105, 106 play the filtering action to 703 and charge for 798MHz signal, and branch knot 107 opens a way, 108 play the filtering action to 885 and charge for 960MHz signal. Correspondingly, the function of blocking signals of other adjacent frequency bands at low frequency can be realized by adjusting the length and the width of the microstrip line with three open-circuit branches or two open-circuit branches, namely the bandwidth of the splitter is properly expanded or replaced. The utility model discloses a branching unit makes the radiation array structure of antenna succinct, the small in size, do benefit to the installation wiring, with low costs, be fit for batch production.

Claims

1. A700M-900M splitter for a base station antenna is characterized in that: the low-frequency splitter PCB is used for outputting only 700M and 900M radio-frequency signals; the front surface of a medium substrate of the low-frequency splitter PCB is provided with a radio-frequency signal input port IN, a 700M output port and a 900M output port, and a first microstrip line, a second microstrip line and a third microstrip line which are respectively connected with the input port IN, the 700M output port and the 900M output port; the first microstrip line is split into a second microstrip line and a third microstrip line, the second microstrip line is provided with three open-circuit branches, and the third microstrip line is provided with two open-circuit branches; the first microstrip line is in a bent line shape, and the second microstrip line and the third microstrip line are in a straight line shape; the back surface and the front surface of the dielectric substrate are communicated through the metallized through holes.

2. The 700M-900M splitter according to claim 1, wherein: the second microstrip line and the third microstrip line are arranged in parallel; two open-circuit branches of the second microstrip line are arranged on the outer side, and one open-circuit branch is arranged on the inner side; and one section of open-circuit branch knot of the third microstrip line is arranged at the outer side, and one section of open-circuit branch knot is arranged at the inner side and is staggered with the open-circuit branch knot of the second microstrip line.

3. The 700M-900M splitter according to claim 2, wherein: the open-circuit branches of the second microstrip line and the third microstrip line are linear and are arranged on two sides of the second microstrip line and the third microstrip line in parallel.

4. The 700M-900M splitter according to claim 1, wherein: widened branches are arranged on the bending line of the first microstrip line, and widened branches are arranged at the starting end and the tail end of the second microstrip line; and a widened branch node is arranged at the starting end of the third microstrip line.

5. The 700M-900M splitter according to claim 1, wherein: the branching unit is fixed on the reflecting plate through a rivet hole pressing rivet.

6. The 700M-900M splitter according to claim 1, wherein: the second microstrip line outputs 703-798MHz signals at the 700M output port; the third microstrip line outputs 885-960MHz signal at the 900M output port.

7. The 700M-900M splitter according to claim 1, wherein: corresponding pad sites are reserved on the back of a medium substrate of the low-frequency splitter PCB near a radio-frequency signal input port, a 700M output port and a 900M output port respectively and are used for welding and fixing a radio-frequency coaxial cable and the splitter.

8. The 700M-900M splitter according to claim 1, wherein: an arrow is arranged on the back of a medium substrate of the low-frequency splitter PCB and points to the direction of the antenna connector of the base station.