CN107959097B

CN107959097B - Road-spacing release-type broadband high-power radial power divider

Info

Publication number: CN107959097B
Application number: CN201711162041.0A
Authority: CN
Inventors: 蒋运石; 闫欢; 胡艺缤; 尹久红
Original assignee: SOUTHWEST INSTITUTE OF APPLIED MAGNETICS
Current assignee: SOUTHWEST INSTITUTE OF APPLIED MAGNETICS
Priority date: 2017-11-21
Filing date: 2017-11-21
Publication date: 2021-02-26
Anticipated expiration: 2037-11-21
Also published as: CN107959097A

Abstract

The invention discloses a road-spaced broadband high-power radial power divider, which comprises a cavity, wherein one side of the cavity is provided with a signal input end, the other side of the cavity is provided with four signal output ends, a related branch formed by a bent slow wave line is arranged between the adjacent signal output ends, each related branch is respectively and symmetrically led out of two isolated ports through two high-power isolated loads, so that signals of the output ports are superposed at the positions of wave crests and the signals of the isolated ports are superposed at the positions of wave troughs on a working frequency band to form the output port with the maximum signal output, and no signal is output from the isolated ports. The invention realizes the high-power isolation among the ports of the power divider, improves the traditional annular bridge circuit, effectively expands the bandwidth and can realize the high-power isolation among the paths within 40 percent of the bandwidth. The invention can effectively reduce the crosstalk and multipath effect of the signal in transmission and greatly improve the signal quality when applied to the system.

Description

Road-spacing release-type broadband high-power radial power divider

Technical Field

The invention relates to a power divider, in particular to a road interval release type broadband high-power radial power divider.

Background

The power distributor is an important basic device in microwave engineering, is widely applied to various civil and military equipment such as civil communication, microwave measurement, radar, communication, electronic countermeasure, aerospace and the like, mainly plays a role in accurately distributing microwave energy on a transmission path to a later-stage system according to system requirements in the equipment, can play a role in synthesizing a high-power microwave signal after amplifying a small signal by matching with a power synthesizer and a microwave amplifier, and is an indispensable key component in the system.

The traditional power divider is mainly a binary power divider, and is obtained by cascading a 2-path power divider through a binary tree structure. For example, the Wilkinson power divider improves the separation characteristic between ports by adding a resistance loss element and realizes full port matching; the annular bridge is also called a hybrid ring and is a 3dB power divider, and the bandwidth of the 1.5 lambda hybrid ring is limited by the annular length and is generally about 20-30%; for waveguide transmission lines, the magic T structure and the E-T branch section are also commonly used four-port power distributors; the structure is shown in fig. 1 to fig. 4 in the drawings of the specification, wherein fig. 1 is a wilkinson power divider, fig. 2 is a ring bridge power divider, fig. 3 is a magic-T structure power divider, and fig. 4 is an E-T branch two-way power divider.

The technical problems and disadvantages of the conventional power divider are mainly reflected in the following aspects:

1. the Wilkinson power divider realizes the separation characteristic between ports and realizes the matching of all ports by adding a resistance loss element, when high-power signal isolation is needed, the Wilkinson power divider needs to select the resistance loss element with high power, the power loss of a device is increased sharply along with the increase of the volume of a high-power resistor and the introduction of ground capacitance, and the engineering application cannot be carried out.

2. The traditional annular bridge is limited by the annular length, the bandwidth can only reach 20-30%, and the application in the current engineering can not be met.

3. For the traditional waveguide type structure power divider, multi-path distribution needs to be realized in a cascading mode, so that the size of a multi-path distribution network is too large, and the application occasions of the multi-path distribution network are greatly limited.

Disclosure of Invention

The present invention is directed to a path-separated broadband high-power radial power divider, which can isolate high-power signals between ports of the power divider to solve the above-mentioned problems.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a road interval release type broadband high-power radial power divider comprises a cavity, wherein one surface of the cavity is provided with a signal input end, the other surface of the cavity is provided with four signal output ends, a coordinate axis is established by the surface of the signal output end, the cavity is of a symmetrical structure symmetrical along an X axis and a Y axis, and the four signal output ends are symmetrically distributed on the axis;

the isolation device comprises four signal output ends, wherein the four signal output ends are connected with each other through a low-power isolation load, the isolation ports are arranged on the two sides of the four signal output ends, the isolation ports are symmetrically arranged on the two sides of the four signal output ends, the transmission impedance of the low-power line is matched with the signal output ends, signals of the signal output ends are superposed at wave crest positions on a working frequency band, the signals of the isolation ports are superposed at wave trough positions, the signal output end is formed to be the maximum signal output, no signal is output from the isolation ports, and the isolation loads are matched with the isolation ports.

Preferably, the method comprises the following steps: the high-power isolation load is a patch type resistor.

Compared with the prior art, the invention has the advantages that: the invention is based on the traditional radial power divider, adds extra association between each distributed signal output end, and adds isolation load, successfully realizes the high-power isolation between the paths without increasing the size.

Because the associated branch nodes exist in a bent slow wave line mode, the miniaturization of a product can be realized, the length of the slow wave line is adjusted according to the working frequency and the corresponding wavelength of the product, and according to the signal interference principle, when a signal is input from a signal input end, the signal is equally divided into 4 paths and output from a signal output end, and an isolation port almost has no signal output, so that the inter-path high-power isolation of the radial power divider is realized, and meanwhile, the broadband matching is realized, and the power distribution and the inter-path high-power isolation can be realized within 40% of bandwidth. The high-power load in the invention realizes port matching through design, so that the isolation among the ports can be realized, and the loss of a distribution network can not be deteriorated.

The invention solves the problem that the traditional radial power divider can not effectively realize the isolation among the output ports, and the performance indexes of the whole system such as navigation, communication, radar and the like can be effectively improved by the broadband characteristic, the road isolation characteristic and the high-power characteristic.

Drawings

FIG. 1 is a Wilkinson power divider;

FIG. 2 is a ring bridge power splitter;

FIG. 3 is a power divider in a T configuration;

FIG. 4 is a diagram of an E-T branch section two-path power divider;

FIG. 5 is a schematic diagram of the circuit configuration of the present invention;

FIG. 6 is a standing wave ratio of an input port;

FIG. 7 is amplitude of the output port;

fig. 8 shows isolation values between output ports.

In the figure: 1. a signal output terminal; 2. an isolated port; 3. a slow wave line; 4. a signal input terminal.

Detailed Description

The invention will be further explained with reference to the drawings.

Example 1: referring to fig. 1 to 4, four power dividers in the prior art are shown, in which fig. 1 is a wilkinson power divider, fig. 2 is a ring bridge power divider, fig. 3 is a magic T-structured power divider, and fig. 4 is an E-T branch two-way power divider.

Referring to fig. 5-8, the technical scheme of the invention is as follows: a road interval release type broadband high-power radial power divider comprises a cavity, wherein one surface of the cavity is provided with a signal input end 4, the other surface of the cavity is provided with four signal output ends 1, a coordinate axis is established by the surface of the signal output end 1, the cavity is of a symmetrical structure symmetrical along an X axis and a Y axis, and the four signal output ends 1 are symmetrically distributed on the axis;

the signal output end 1 is provided with a plurality of signal output ends 1, each signal output end 1 is provided with a plurality of associated branches formed by bent slow wave lines 3, each associated branch is respectively and symmetrically led out of two isolated ports 2 through two high-power isolated loads, the number of the isolated ports 2 is eight, the isolated ports are distributed on two sides of the four signal output ends 1 in a pairwise symmetrical mode, the transmission impedance of the slow wave lines 3 is matched with each signal output end 1, signals of the signal output ends 1 are superposed at the positions of wave crests, signals of the isolated ports 2 are superposed at the positions of wave troughs, the signal output end 1 is formed to be the maximum signal output, no signal is output from the isolated ports 2, and the isolated loads are matched with the isolated; the high-power isolation load is a patch type resistor.

The working principle of the invention is as follows: on the basis of the traditional radial power divider, additional association is added among distributed signal output ends 1, and isolation loads are added, so that the inter-path high-power isolation is successfully realized on the premise of not increasing the size.

The isolation load is independent of the circuit of the power distribution network and is a matched load of the isolation port 2, and the isolation load can use a high-power load according to actual requirements without causing redundant loss to the circuit of the power distribution network.

The specific matching method comprises the following steps: the signals of the output ports are superposed at the positions of wave crests, and the signals of the isolated ports 2 are superposed at the positions of wave troughs. As shown in fig. 6-8, fig. 6 is a standing wave ratio of the input port, wherein the standing wave is small, which means that the signal reflection is small during transmission; FIG. 7 shows the amplitude of the output port, where high amplitude consistency indicates that the signal is distributed to each path with good size consistency; fig. 8 shows the isolation values between the output ports, which is large to reduce the interference of the reflected signal of the later stage to the system of the earlier stage.

Claims

1. The utility model provides a way interval is from high-power radial power divider of type broadband, includes a cavity, the cavity one side is equipped with signal input part, the another side is equipped with four signal output part, its characterized in that: establishing a coordinate axis by using the surface of the signal output end, wherein the cavity is in a symmetrical structure which is symmetrical along an X axis and a Y axis, and the four signal output ends are symmetrically distributed on the axis;

the isolation device comprises four signal output ends, wherein the four signal output ends are connected with each other through a low-power isolation load, the isolation ports are arranged between the adjacent signal output ends, each association branch is composed of bent slow wave lines, each association branch is symmetrically led out of two isolation ports through two high-power isolation loads, the number of the isolation ports is eight, the isolation ports are distributed on two sides of the four signal output ends in a pairwise symmetrical mode, the transmission impedance of the slow wave lines is matched with the signal output ends, signals of the signal output ends are superposed at wave crest positions on a working frequency band, the signals of the isolation ports are superposed at wave trough positions, the signal output ends are formed to be the maximum signal output, the isolation ports have no signal output, the isolation loads.