A Broadband Directional Coupler with Microstrip Slot Coupling

Abstract

The invention discloses a broadband directional coupler coupled with a microstrip slot. The broadband directional coupler includes a wiring layer, a dielectric layer and a bottom layer. The wiring layer is arranged above the dielectric layer, and the dielectric layer is arranged on the Above the bottom layer, the wiring layer includes a radio frequency main line and a coupling line, a first protrusion is provided on the radio frequency main line, a second protrusion is provided on the coupling line, and the gap between the first protrusion and the second protrusion is Cooperate and set between the RF main line and the coupling line. Through the gap fit between the first convex part and the second convex part, it plays the role of a capacitor. Compared with the traditional single-section directional coupler, the directional coupler coupled with the microstrip gap of the present invention has broadband performance. Compared with the same as The single-segment fixed coupler loaded with capacitance for broadband application has reliable broadband performance and is easy to process; compared with the multi-segment coupler which is also used as broadband, the invention has small insertion loss, simple structure and small volume.

Description

technical field [0001] The invention relates to the field of microwave radio frequency, in particular to a broadband directional coupler coupled with a microstrip slot. Background technique [0002] There are several implementations of directional couplers, including aperture coupling, coplanar waveguide, stripline coupling, bridge coupling, and more. Among them, the microstrip line coupler is widely used because of its good performance, easy design, and low production cost, especially in the growing field of mobile communication. [0003] The traditional single-section microstrip directional coupler is difficult to achieve better broadband characteristics due to the design limitation of a quarter wavelength of the microstrip line. Taking the 700MHz-2700MHz frequency band as an example, the bandwidth of a single-section directional coupler is even less than 50%. In order to improve the bandwidth of the directional coupler, the existing method is to design a multi-section d...

AI Technical Summary

Problems solved by technology

[0003] The traditional single-section microstrip directional coupler is difficult to achieve better broadband characteristics due to the design limitation of a quarter wavelength of the microstrip line. Taking the 700MHz-2700MHz frequency band as an example, the bandwidth of a single-section directional coupler is even less than 50%

In order to improve the bandwidth of the directional coupler, the existing method is to design a multi-section directional coupler to increase the bandwidth. The disadvantage of the multi-section directional coupler is that it is bulky and complex in design, and the final insertion loss is relatively large; in addition, The way of loading capacitance between the microstrip straight-through line and the coupled line of the single-section directional coupler can also increase the bandwidth. However, this not only requires an additional lumped component, but also requires an additional welding process in processing, which enhances production. cost

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