CN114024118A

CN114024118A - Power distribution network formed in combined bridge mode

Info

Publication number: CN114024118A
Application number: CN202111311917.XA
Authority: CN
Inventors: 尹久红; 李鹏; 丁敬垒; 胡艺缤; 闫欢; 王亚东
Original assignee: CETC 9 Research Institute
Current assignee: CETC 9 Research Institute
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-02-08
Anticipated expiration: 2041-11-08
Also published as: CN114024118B

Abstract

The invention discloses a power distribution network formed by a combined bridge mode, which belongs to the technical field of communication devices and comprises three independent bridges, namely a 180-degree bridge and two 90-degree bridges; the three electric bridges are combined into a three-layer three-dimensional structure and sequentially comprise a 90-degree electric bridge, a 180-degree electric bridge and a 90-degree electric bridge from top to bottom; the invention combines the 180-degree electric bridge and the 90-degree electric bridge to obtain the power distribution network which can divide the power into four parts and has 90-degree phase difference between adjacent phases, and the power distribution network presents a three-dimensional stacking mode and saves the space of devices. The bandwidth of the bridge is increased by adopting a cascade mode; the phase position of each port is effectively adjusted by using a copper strip soft lap joint method.

Description

Power distribution network formed in combined bridge mode

Technical Field

The invention relates to the technical field of communication devices, in particular to a power distribution network formed in a combined bridge mode.

Background

In modern wireless communication, passive devices are widely used due to their advantages of reliable performance, no pollution, low power consumption, etc. Of these, the 3dB bridge and the 180 ° bridge are two common passive devices in passive systems. The 3dB electric bridge is commonly used for signal combination, signal division, power synthesis and the like; 180 ° bridges are commonly used in microwave and millimeter wave systems, such as balanced power amplifiers, modulators, demodulators, and power distribution networks for array antennas.

The existing composite bridges are generally planar, and the composite bridges formed by design need a large space. In addition, the bandwidth of the existing 3dB bridge is generally only 8%, and the phase value of the existing bridge cannot be adjusted, so that the reliability of the device needs to be improved.

Disclosure of Invention

The present invention aims to provide a power distribution network formed by a combined bridge method to solve the above problems.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a power distribution network formed by a combined bridge mode comprises three independent bridges, namely a 180-degree bridge and two 90-degree bridges; the three bridges are combined into a three-layer three-dimensional structure, and the three bridges are a 90-degree bridge, a 180-degree bridge and a 90-degree bridge from top to bottom in sequence.

The invention provides a power division network which can perform quartering on input signals and phase shift of each output signal by 90 degrees on a satellite-borne satellite. Namely, a power division network which can divide power into four by one and has 90-degree phase difference is obtained by utilizing a 180-degree bridge and a 90-degree bridge. The basic idea is as follows: the input signal enters a 180 ° bridge, which splits the signal equally into a signal with a phase of half the power of 0 ° and a signal with a phase of half the power of 180 °. And the two signals are divided into four paths of divided signals with the phase difference of 90 degrees and the power of one quarter of the input signals respectively through two 3dB electric bridges. The power of the four-way signal is one fourth of that of the input signal, and the corresponding phases are 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively. The corresponding schematic diagram is shown in fig. 1.

As a preferred technical scheme: each bridge is respectively two layers of copper-clad plates, and the three bridges are six layers of copper-clad plates in total.

The reason that two layers of copper clad plates are preferably adopted is as follows:

1. the plane size of the product can be reduced, the design structure is a strip line structure, the circuit is in the middle, and the upper part and the lower part of the circuit are both dielectric layers, so that the copper clad laminate is formed by two copper clad laminates;

2. the product consists of three electric bridges, each electric bridge consists of an upper grounding layer, a lower grounding layer and a middle circuit layer, and two copper-clad plates are required to be used.

As a preferred technical scheme: the back of each bridge is plated with silver.

As a preferred technical scheme: the three bridges are formed into a whole by means of lamination.

As a preferred technical scheme: and connecting the circuits of the three bridges together in a copper strip lap joint mode. The traditional connection mode of the metallized via holes is improved into a mode of lapping by using a soft copper strip so as to achieve the purpose of adjusting the phase of an outlet of the bridge, namely, the phase of four ports is adjusted by using a method of lapping the copper strip softly, so that the reliability of a device is ensured

As a further preferable technical scheme: the length of the copper strip is 15 mm-17 mm.

The phase consistency is determined by a microwave transmission path, and the copper strip is designed around a product, belongs to accessories added subsequently, is easy to operate, and is easy to adjust the length of the copper strip, so that the phase consistency is improved.

And preferably controlling the length of the copper strip to be about 15-17 mm according to the phase consistency requirement.

As a preferred technical scheme: the 180-degree electric bridge adopts a ring-shaped electric bridge structure and consists of three lambda/4 lines and one 3 lambda/4 line.

As a preferred technical scheme: a lambda/4 line is matched in the middle of the 90-degree bridge. The bandwidth of the 90-degree bridge is increased by using a cascade mode, namely adding a grade of lambda/4 matched line on the traditional mode.

Compared with the prior art, the invention has the advantages that: the invention combines the 180-degree electric bridge and the 90-degree electric bridge to obtain the power distribution network which can distribute four power and has 90-degree phase difference between adjacent phases, and the power distribution network presents a three-dimensional stacking mode and saves the space of devices. The bandwidth of the bridge is increased by adopting a cascade mode; the phase position of each port is effectively adjusted by using a copper strip soft lap joint method.

Drawings

FIG. 1 is a schematic diagram of a power distribution network of the present invention;

fig. 2 is a schematic diagram of a power distribution network according to an embodiment of the present invention;

FIG. 3 is a 180 ° bridge model S parameter performance simulation curve;

FIG. 4 is a 180 ° phase simulation curve of the bridge model;

FIG. 5 is a 90 ° bridge model S parameter performance simulation curve;

FIG. 6 is a phase simulation curve for a 90 ° bridge model;

FIG. 7 is a simulation curve of S parameter performance of a composite bridge according to an embodiment of the present invention;

FIG. 8 is a phase simulation curve of a combined bridge according to an embodiment of the present invention;

fig. 9 is a schematic diagram of the lap joint of the power division network copper strip according to the embodiment of the present invention.

In the figure: 1. a 90 ° electrical bridge; 2. a 180 DEG bridge; 3. copper strips; 4. a transmission line.

Detailed Description

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

Example (b):

referring to fig. 2, a power distribution network formed by a combined bridge manner includes three independent bridges, namely a 180 ° bridge 2 and two 90 ° bridges 1; the three bridges are combined into a three-layer three-dimensional structure and sequentially comprise a 90-degree bridge 1, a 180-degree bridge 2 and a 90-degree bridge 1 from top to bottom;

in the embodiment, the three electric bridges comprise six copper-clad plates, wherein the three independent electric bridges form a whole in a laminating mode, the back parts of the single electric bridges are subjected to silver plating treatment, and the circuits of the three independent electric bridges are connected together in a soft lap joint mode through a copper strip 3;

the 180-degree bridge adopts a ring bridge scheme, and particularly consists of 3 lambda/4 lines and one 3 lambda/4 line. The simulation results are shown in fig. 3 and 4. As can be seen from FIG. 3, the return loss of the product in the P-band range can reach 20dB, the amplitude consistency of the two power splitting ports is good, the loss is about 0.11dB, and the isolation of the product is better than 25 dB; as can be seen from fig. 4, the phase consistency of the product in this frequency band is good, the maximum phase difference is within ± 3 °, and the phase requirement is met;

the 90-degree bridge adopts a traditional ring bridge scheme, and in order to expand the bandwidth of the 90-degree bridge, a section of lambda/4 line is matched in the middle (a cascade method). The simulation results are shown in fig. 5 and 6. As can be seen from FIG. 5, the return loss of the product in the P-band range can reach 20dB, the amplitude consistency of the two power splitting ports is good, the loss is about 0.13dB, and the isolation of the product is better than 20 dB; as can be seen from fig. 6, the phase consistency of the product in this frequency band is good, the phase difference of (420 MHz) in the central frequency band is 90 °, and the maximum phase difference in the whole frequency band is within ± 1 °, which meets the phase requirement of the project;

the product simulation results are shown in fig. 7 and 8 after the 180 ° bridge and the 90 ° bridge designed as above are combined according to the above structure. As can be seen from fig. 7, the return loss of the product in the P-band range can reach 22dB, the four-way power splitting port has good amplitude consistency, and the loss is about 0.4 dB; as can be seen from fig. 8, the phase of the product in this central frequency band is about 102 °, which is about 10 ° different from the theoretically calculated phase. As can be seen from fig. 2, in the three-layer bridge, the top layer and the bottom layer are 90 ° bridges, and the middle is a 180 ° bridge, two of the four output ports are at the top layer and two are at the bottom layer. Because the final structure needs all ports to be connected with the antenna array at the bottommost layer, two ports of the top layer are slightly longer than the point length of the two ports of the bottom layer, and output phases of the two ports of the top layer are out of tolerance;

in order to solve the out-of-tolerance problem, the phase consistency of four output ports can be effectively controlled by changing the length of the copper strip between the first layer and the second layer of circuit boards in an overlapping manner, and the performance of the product is improved. As shown in fig. 9, which is a schematic diagram of the lap joint of the power division network copper strip, in fig. 9, the 180 ° electrical bridge 2 in the middle layer and the 90 ° electrical bridge 1 in the bottom layer are in a lap joint mode with the copper strip 3. Practical measurement shows that the method can effectively improve the phase consistency of the device and improve the performance of the device.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A power distribution network formed by a combined bridge mode is characterized in that: the device comprises three independent electric bridges, namely a 180-degree electric bridge and two 90-degree electric bridges; the three bridges are combined into a three-layer three-dimensional structure, and the three bridges are a 90-degree bridge, a 180-degree bridge and a 90-degree bridge from top to bottom in sequence.

2. The power distribution network formed in a combined bridge fashion of claim 1, wherein: each bridge is respectively two layers of copper-clad plates, and the three bridges are six layers of copper-clad plates in total.

3. The power distribution network formed in a combined bridge fashion of claim 1, wherein: the back of each bridge is plated with silver.

4. The power distribution network formed in a combined bridge fashion of claim 1, wherein: the three bridges are formed into a whole by means of lamination.

5. The power distribution network formed in a combined bridge fashion of claim 1, wherein: and connecting the circuits of the three bridges together in a copper strip lap joint mode.

6. The power distribution network formed in a combined bridge fashion of claim 5, wherein: the length of the copper strip is 15 mm-17 mm.

7. The power distribution network formed in a combined bridge fashion of claim 1, wherein: the 180-degree electric bridge adopts a ring-shaped electric bridge structure and consists of three lambda/4 lines and one 3 lambda/4 line.

8. The power distribution network formed in a combined bridge fashion of claim 1, wherein: a lambda/4 line is matched in the middle of the 90-degree bridge.