Five-stage coupling bridge

Abstract

The invention discloses a five-stage coupling bridge, and relates to the technical field of bridges. The five-stage coupling bridge is composed of a cavity, a cover plate, dielectric plates and additional dielectric plates, wherein the cover plate is installed above the cavity, the cavity is internally provided with the circuit board, the upper surface and the lower surface of the circuit board are provided with a microstrip line respectively, four ends of the microstrip lines are connected with the external part through the cavity, the dielectric plates are arranged above and below the circuit board respectively, and the dielectric plates are externally provided with the additional dielectric plates respectively. The five-stage coupling plate adopts a coupling strip line five-stage microstrip line symmetric design, not only can meet requirements of general columnar coupling rod bridges for the bandwidth and change a circumstance that the strip lines cannot be guaranteed in rigidity and easy to deform because the strip lines are too long at the same time, but also reduces the required processing accuracy, assembling requirements and the production cost in the production process.

Description

Technical field: [0001] The invention relates to the technical field of electric bridges, in particular to a five-level coupling 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...

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

Images