CN105655679A

CN105655679A - Quasi-planar high-isolation multi-path power divider

Info

Publication number: CN105655679A
Application number: CN201610017652.5A
Authority: CN
Inventors: 宋开军; 胡顺勇; 张樊; 朱宇; 樊茂宇; 樊勇
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2016-01-12
Filing date: 2016-01-12
Publication date: 2016-06-08
Anticipated expiration: 2036-01-12
Also published as: CN105655679B

Abstract

The invention relates to a quasi-planar high-isolation multi-path power divider. An input radio-frequency signal is subjected to multi-path power allocating and input impedance matching through an upper-level power dividing network. Meanwhile, the insulating characteristics and the output VSWR at all output ports are ensured to be excellent through a lower-level isolating network and an isolation resistor. The upper-level power dividing network and the lower-level isolating network are connected via metallized through holes. According to the technical scheme of the invention, the advantages of a quasi-planar structure, including multiple ports, high isolation, low insertion loss, good input/output standing wave ratio, wide band, small volume, good consistency of signal amplitudes/phases at all output ports, and the like, are realized. Meanwhile, the quasi-planar high-isolation multi-path power divider is convenient to design and the infinite multi-path power distribution can be realized theoretically. The quasi-planar high-isolation multi-path power divider is mainly applied to microwave and millimeter wave power synthesis and amplification systems, phased array antenna feed networks and the like. The quasi-planar high-isolation multi-path power divider has a wide application prospect in the fields of microwave and millimeter wave systems for communication, radar, measurement, control and the like.

Description

A kind of directrix plane high isolation multi-path power divider

Technical field

The present invention relates to a kind of novel directrix plane high isolation multi-path power divider adopting double layer substrate.

Background technology

Power splitter is power synthesis amplifier and the critical component of phased array antenna feed system, directly determines the quality of system performance index. Along with the military fast development with commercial signal communication system, for the needs of the feeding network of the characteristics such as broadband, high isolation, planarization, filter with low insertion loss are grown with each passing day by broadband, the demand of high-efficiency high-power amplifier and phased array antenna. This be accomplished by broadband, efficiently, low-loss, plane, high isolation characteristic multi-path power divider/synthesizer. Traditional multi-path power divider mainly adopts 3 D stereo circuit realiration (such as multichannel wave-guide cavity wave power splitter), and volume is big, cost is high, not easy of integration; It is often difficult to isolation characteristic good between output port while realizing the power distribution of N road simultaneously. On the other hand, traditional binary type power splitter, although good isolation characteristic can be realized, but there is larger in size and that loss is higher problem. Therefore, plane, broadband, low-loss, high isolation characteristic multi-path power divider/synthesizer realize for Modern Communication System development have be of great significance.

Summary of the invention

It is an object of the invention to provide a kind of directrix plane high isolation multi-path power divider, it has high-isolation, filter with low insertion loss, good input/output standing-wave ratio, broadband, small size and is prone to the good characteristic such as integrated with active device, can realize the power distribution of unlimited multichannel and high-isolation in theory. Each road output port signal amplitude/phase equalization is good, it is adaptable to the merit in small size multi-channel power synthetic system or array antenna divides feeding network.

To achieve these goals, the present invention proposes a kind of power splitter adopting double layer substrate structure, power division network to separate with isolation network. Its concrete technical scheme is as follows:

Directrix plane high isolation multi-path power divider, including upper and lower two layer medium substrate, input/output micro-strip port, isolation resistance, middle ground metal level and plated-through hole. It is characterized in that, described directrix plane high isolation multi-path power divider, by two layer medium substrate and be positioned at above two-layer substrate, middle and lower section three-layer metal layer is constituted, upper metal layers is microstrip multi-channel power distributing network, metallic intermediate layer layer is ground metal layer, and lower metal layer includes micro-strip isolation network and isolation resistance.Upper strata power distributing network is coupled together by the plated-through hole being positioned at from upper strata power distributing network common point quarter-wave strong point with lower floor's isolation network, and wherein, the plated-through hole of this leap middle ground metal level does not connect with middle ground metal level. Lower floor's isolation network is connected to, by four sections of one end, microstrip line that the common point other end is connected with upper strata Ge Lu micro-strip and isolation resistance forms, wherein, every section of microstrip line is made up of the quarter-wave microstrip line that two sections of width are different, isolation resistance one end is connected to the junction of the different microstrip line of these two sections of width, and the other end is connected to intermetallic metal ground by plated-through hole.

Described directrix plane high isolation multi-path power divider is symmetrical structure, and upper strata is power distributing network, and lower floor is isolation network, and the signal amplitude/phase place of every road output port is equal. Adopt two layer medium substrate and three-layer metal layer, by pcb board process technology, it is achieved circuit structure.

Directrix plane high isolation multi-path power divider operation principle proposed by the invention is as follows:

Radiofrequency signal is from the micro-strip port feed-in being positioned at upper strata, through the microstrip line that a plurality of structure is identical and symmetrical, it is achieved multichannel constant amplitude, homophase signal output. Lower floor's isolation network is made up of a plurality of microstrip line of two point of one wavelength identical with merit branch number and the isolation resistance of same number, this isolation network one end is connected to common point place, the other end is connected with upper strata power division network by plated-through hole, isolation resistance one end is connected to 1/2nd wave microstrip line centers, the other end is connected to intermetallic metal ground by plated-through hole, realizes high isolation and good output standing wave between the output port of each road with this. Symmetry due to circuit structure, it is ensured that each road exports the good amplitude of signal and phase equalization. The technology that patent of the present invention provides can meet various different application demand, such as multichannel power combing and phased array feeding network etc., has great application advantage.

Directrix plane high isolation multi-path power divider proposed by the invention, not only volume is little, cost is low, compact conformation, flexible design are convenient, and has high output port isolation, each road signal amplitude and the advantage such as phase equalization is good, broadband, output standing wave are good. Present invention is mainly used for microwave power synthesis system, array antenna etc., have broad application prospects in the microwave systems such as communication, radar, observing and controlling.

Accompanying drawing explanation

Fig. 1 is the directrix plane high isolation multi-path power divider structural representation that the present invention proposes;

Fig. 2 is the S parameter simulation curve of Fig. 1;

Attached number in the figure correspondence name is called:

(1) medium substrate, (2) input micro-strip port, (3) output micro-strip port, (4) middle ground metal level, (5) isolation resistance, (6) plated-through hole, (7) lower floor isolation network.

Detailed description of the invention

Below by for example bright advantages of the present invention.

Example 1: as it is shown in figure 1, the directrix plane high isolation multi-path power divider that the present invention proposes, it comprises following components. Respectively: two layer medium substrate, micro-strip port, multiple-channel output micro-strip port, middle ground metal level, isolation resistance, plated-through hole and lower floor's isolation network are inputted.

Power division network is positioned at upper metal layers, is directly realized by the power distribution of multichannel, constant amplitude, homophase by the quarter-wave microstrip line of a plurality of symmetry after microstrip-fed port. Isolation network is positioned at lower metal layer, is made up of the isolation resistance of 1/2nd wave microstrip lines identical with merit branch number and corresponding number. Upper strata power division network is connected by plated-through hole with lower floor isolation network, to realize the excellent isolation characteristic of each output port and impedance matching.

Fig. 2 (a) is the frequency response curve of example 1, and within the scope of 1.68GHz-2.47GHz, the return loss of input port is all higher than 20dB as seen from the figure, and in-band insertion loss is less than 0.4dB (not comprising the 6dB theory Insertion Loss of four road power splitters).

Fig. 2 (b) is the outfan port isolation characteristic of example 1, as can be seen from Figure, the isolation of output port within the scope of 1.49GHz-2.65GHz more than 20dB, more than 25dB within the scope of 1.8GHz-2.34GHz, it is achieved that output port high-isolation characteristic.

Fig. 2 (c) is the outfan reflection coefficient of port loss of example 1, as can be seen from Figure, output port return loss within the scope of 1.73GHz-2.47GHz more than 15dB.

Fig. 2 (d) is the outfan port phase characteristic curve of example 1, and in whole frequency band range, output port phase equalization is fine as seen from the figure.

Claims

1. directrix plane high isolation multi-path power divider, including upper and lower two layer medium substrate (1), input micro-strip port (2), multiple-channel output micro-strip port (3), middle ground metal level (4), isolation resistance (5), plated-through hole (6) and lower floor's isolation network (7), it is characterized in that, described directrix plane high isolation multi-path power divider is made up of two layer medium substrate, upper strata is power distributing network, lower floor is isolation network, and connect upper and lower two-layer by plated-through hole, to realize the high isolation characteristic of output port and excellent output standing wave.

2. directrix plane high isolation multi-path power divider according to claim 1, adopt two layer medium substrate, by PCB substrate process technology, obtain the structures such as input micro-strip port (2) of needs, multiple-channel output micro-strip port (3), middle ground metal level (4) and lower floor's isolation network (7).

3. according to claim 1, lower floor's isolation network (7) described in 2, it is made up of 1/2nd wave microstrip lines identical with merit branch number, one end is connected to common point, the other end is connected with upper strata power division network by plated-through hole, wherein, every 1/2nd wave microstrip line are made up of the quarter-wave microstrip line that two sections of width are different, isolation resistance (5) is installed in lower floor's isolation network, its number is identical with merit branch number, one end of isolation resistance is installed in each 1/2nd wave microstrip lines of lower floor's isolation network in the heart, the other end is installed on plated-through hole (6).

4. directrix plane high isolation multi-path power divider according to claim 1, according to reciprocal theorem, the input/output end port of described power splitter swaps, and will become power combiner, the structure of directrix plane high isolation multichannel power combiner and design just the same with above-mentioned power splitter.