Rectangular waveguide directional coupler

Abstract

The invention discloses a rectangular waveguide directional coupler. The rectangular waveguide directional coupler comprises a main rectangular waveguide serving as a main microwave channel, a sub-rectangular waveguide serving as a sampling signal channel, and coupling holes serving as coupling channels, wherein the main mode H-surface of the main rectangular waveguide is parallel to that of the sub-rectangular waveguide; the main rectangular waveguide is isolated from the sub-rectangular waveguide; the main rectangular waveguide is communicated with the sub-rectangular waveguide through one or two coupling holes; at least one coupling hole includes a hollow coupling pipe attached with the sidewall of the main rectangular waveguide or / and the sidewall of the sub-rectangular waveguide; the sidewall of the hollow coupling pipe close to the rectangular waveguide is connected with a coupling cavity with three opening ends; and the coupling cavity is communicated with the hollow coupling pipe, and is located between and communicated with the main rectangular waveguide and the sub-rectangular waveguide. The rectangular waveguide directional coupler provided by the invention is compact in structure and easy in processing, and has the outstanding advantage of low insertion loss in comparison with the common single-hole directional coupler, particularly in the millimeter wave band and the Terahertz wave band.

Description

technical field [0001] The invention relates to a rectangular waveguide directional coupler, in particular to a rectangular waveguide directional coupler coupled by single or double holes. Background technique [0002] The directional coupler is a microwave device widely used in the microwave system. Its main function is to distribute the power of the microwave signal in a certain proportion; the directional coupler is composed of two transmission lines, coaxial line, rectangular waveguide, circular waveguide, Both striplines and microstrip lines can form directional couplers; so from the structure point of view, there are many types of directional couplers with great differences, but from the perspective of their coupling mechanism, they are mainly divided into four types, namely small hole coupling, parallel coupled, branch coupled, and matched double-T. [0003] Before the early 1950s, almost all microwave equipment used metal waveguides and waveguide circuits, and the ...

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Problems solved by technology

[0005] The traditional single-hole directional coupler has some advantages: such as simple structure, few parameters, and it is more convenient to design; but it also has some disadvantages: such as narrow bandwidth and poor directivity, it is only suitable for working at the design frequency, and it deviates from this frequency , the directionality will decrease

[0006] Although the traditional porous directional coupler can achieve a very wide bandwidth, it also has some disadvantages, such as large volume, high processing precision requirements, high insertion loss, especially in the millimeter-wave terahertz band, the high insertion loss makes the The device loses its use value; this motivates us to design a new type of directional coupler that can overcome these shortcomings

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