Five-stage microstrip line bridge

Abstract

The invention provides a five-stage microstrip line bridge, and relates to the technical field of bridges. The five-stage microstrip line bridge comprises a cavity, a cover board, a circuit board, dielectric boards and additional dielectric boards, wherein the cover board is mounted above the cavity; the circuit board is arranged in the cavity; the upper surface and the lower surface of the circuit board are respectively provided with a microstrip line; four ends of each microstrip line can be respectively connected with the outside through the cavity; the dielectric boards are respectively arranged on and under the circuit board; and the additional dielectric boards are respectively arranged outside the dielectric boards. According to the invention, the symmetrical design of the five-stage microstrip lines of coupled strip lines is adopted, so that the requirements of a common columnar coupled rod bridge for coverage bandwidth can be met; meanwhile, the situations that the rigidity can not be ensured and a strip line is easy to deform in case of an over-long length are changed; and the processing required accuracy, assembling requirement and production cost in the production process are 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 stripline cavity design also faces bandwidth limitations, and it is difficult to exceed the frequency of 700-2700MHz. Once the bandwidth is w...

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 stripline cavity design 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, it is difficult to guarantee the stiffness of the stripline, 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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