A Porous Rectangular Waveguide Directional Coupler

Abstract

The invention discloses a porous rectangular waveguide directional coupler, which comprises a main rectangular waveguide as a microwave main channel, a secondary rectangular waveguide as a sampling signal channel, and a coupling hole as a coupling channel; the main mode H surface of the main rectangular waveguide and the secondary rectangular waveguide The main mode H planes of the waveguide are parallel to each other; the main rectangular waveguide and the secondary rectangular waveguide are isolated from each other, and the two are connected through the coupling hole arranged along the axis of the main rectangular waveguide; the coupling hole is symmetrical about the centerline of the wide wall of the main rectangular waveguide in the transmission direction The first row of coupling holes and the second row of coupling holes. The porous rectangular waveguide directional coupler provided by the present invention has a simple structure and is easy to process. The whole structure has only six coupling holes, which can be directly processed on the cavity by traditional techniques. After simulation test, it has wide working bandwidth and small insertion loss. Compared with the traditional waveguide coupler, the invention has small volume and simple structure, and can be conveniently integrated in high-frequency circuits.

Description

technical field [0001] The invention belongs to the technical field of porous directional couplers, in particular to a porous rectangular waveguide directional coupler coupled by six symmetrical holes. Background technique [0002] The directional coupler is a microwave / millimeter wave component widely used in microwave systems. It is mainly used for signal isolation, separation and mixing; the directional coupler is composed of two transmission lines, coaxial line, rectangular waveguide, circular waveguide , striplines and microstrip lines can all constitute directional couplers; so from the structural 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 coupling, branch coupling and matched double T. [0003] The first real directional coupler was designed and implemented by H.A. Wheeler in 1944. Wheeler used a...

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Problems solved by technology

[0003] The first real directional coupler was designed and implemented by H.A. Wheeler in 1944. Wheeler used a pair of cylinders with a length of a quarter of the center frequency wavelength to achieve mutual coupling of electric and magnetic fields. Unfortunately, this method can only achieve a bandwidth of one octave

[0004] At present, the main directional couplers include microstrip and waveguide directional couplers. However, microstrip lines are not suitable for working in the millimeter wave band due to their large transmission loss. Although non-planar waveguide structures such as dielectric waveguides and rectangular waveguides have small losses and high performance, they are Due to its large size and difficulty in integrated processing, it is difficult to be widely used in highly integrated systems

[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 wide bandwidth and improve the directivity, it also has some disadvantages, such as large volume, high processing precision requirements, and high insertion loss, especially in the millimeter-wave terahertz band. Excessive insertion loss makes the device useless

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