Five-level microstrip line bridge

Abstract

A five-level microstrip line bridge relates to the technical field of bridges. The five-level microstrip line bridge is composed of a cavity, a cover plate, a circuit board, medium plates and additional medium plates. The cover plate is installed above the cavity. The cavity is internally provided with the circuit board. Upper and lower surfaces of the circuit board are respectively provided with a microstrip line. Four ends of the microstrip line are connected with the outer parts through the cavity. The medium plates are arranged above and below the circuit board, and the additional medium plates are respectively arranged outside the medium plates. According to the invention, the symmetric design of coupling stripline five-level microstrip lines is adopted, the coverage bandwidth requirement of a general cylindrical coupling rod bridge is met, the conditions that the stripline is too long to ensure the rigidity and is liable to deform are also changed, and the machining precision, the assembling requirements and the production cost in the production process are also lowered.

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 bandwi...

AI Technical Summary

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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