Microstrip line bridge

Abstract

The invention discloses a microstrip line bridge and relates to the technical field of an electrical bridge. The microstrip line bridge comprises a cavity, a cover plate, a circuit board, dielectric plates and additional dielectric plates, wherein the cover plate is arranged above the cavity, the circuit board is arranged in the cavity, a microstrip line is arranged on each of the upper surface and the lower surface of the circuit board, the four ends of the microstrip lines are all connected with the outside through the cavity, the dielectric plates are respectively arranged above and below the circuit board, and the additional dielectric plates are respectively arranged outside the dielectric plates. In the microstrip line bridge, a symmetric design of a five-stage microstrip line of a coupling strip line is adopted, the requirement of a conventional cylindrical coupling bar bridge for coverage bandwidth can be met, meanwhile, the situations that the rigidity cannot be guaranteed and the strip line is easy to deform due to overlong length are changed, and the processing required accuracy, the assembly requirement and the production cost during the production process are also reduced.

Description

technical field [0001] The invention relates to the technical field of electric bridges, in particular to a microstrip line electric bridge. Background technique [0002] The frequency of the widely used 3dB bridge is between 800-2500MHz. This frequency covers the main frequency of mobile communication, and also covers the general frequency of 3G. Due to the popularization of digital TV, the original analog signal gradually cancels the frequency of 700MHz. It may be used in 3G products. If you want full-band coverage, you need bridges and power splitters with wider bandwidths to cover more frequency bands. Existing bridges generally use the following designs , but each has its own drawbacks: [0003] 1. Microstrip line design, its bandwidth is limited, and it is generally difficult to exceed four times the frequency; [0004] 2. The design of the stripline cavity also faces bandwidth limitations, and it is difficult to exceed the frequency of 700-2700MHz. Once the bandwidt...

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Problems solved by technology

[0003] 1. Microstrip line design, its bandwidth is limited, and it is generally difficult to exceed four times the frequency;

[0004] 2. The design of the stripline cavity also faces bandwidth limitations, and it is difficult to exceed the frequency of 700-2700MHz. Once the bandwidth is widened and the stripline is lengthened, the rigidity of the stripline is difficult to guarantee, and it is easy to deform. The actual trial-produced product and The difference in simulation is huge, and it is difficult to be practical, because the coupling area of ​​the bridge is very tight, so it is much more difficult to design the coupler with different frequencies;

[0005] 3. Columnar coupling rod design, although its bandwidth can cover 350-2700MHz, but its processing requires high precision, complex assembly, and high cost, which greatly limits the application of this type of product

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