Magic-T structure for integrated waveguide plane of mini-type wideband half mode substrate

Abstract

The invention relates to a magic-T structure of a mini-type wideband HMSIW (Half Mode Substrate Integrated Waveguide) plane. The magic-T structure of a mini-type wideband HMSIW plane comprises an upper metal face, a middle metal face and a lower metal face of a medium substrate; the medium substrate comprises a row of metal columns; the middle metal face is etched to form a slot line structure for realizing the energy transmission from micro-strip line to half mode substrate integrated waveguide HMSIW. The magic-T structure for integrated waveguide plane of mini-type wideband half mode substrate provided by the invention uses a half mode substrate integrated waveguide HMSIW equal power division network which replaces a traditional branch structure, so that the structure of the whole plane magic-T is reduced by 3 / 4 by comparing with the plane magic-T structure of past substrate integrated waveguide SIW (Substrate Integrated Waveguide), the relative working bandwidth of the magic-T is improved greatly, and the differential arm and the equal power division port of the plane magic-T are provided with an excellent isolation performance therebetween. The magic-T structure of a mini-type wideband HMSIW plane provided by the invention has the advantages that the design is simple, the volume is small, the electrical property is good, and the magic-T is easy to be integrated with other microwave millimeter wave circuits.

Description

technical field [0001] The invention belongs to a microwave and millimeter wave hybrid integrated circuit, in particular to a new type of small broadband half-mode substrate integrated waveguide planar magic T structure with a floor groove line etching structure. Background technique [0002] The magic T structure is a four-port microwave device. Ideally, the magic T structure is a 180° hybrid ring. However, the traditional waveguide magic T structure is bulky and it is difficult to realize a broadband matching circuit, so the transmission is relatively Bandwidth is generally below 10%. The planar structure realized by applying mature design platforms such as SIW (Substrate Integrated Waveguide) and half-mode substrate integrated waveguide (HMSIW (Half Mode Substrate Integrated Waveguide)), combines the advantages of rectangular waveguide and microstrip line. Advantages, it has the advantages of small size, light weight, relatively wide bandwidth, and can withstand a high p...

AI Technical Summary

Problems solved by technology

In the past, the substrate integrated waveguide (SIW) planar magic T structure used a T-shaped or Y-shaped branch network. The disadvantages of this type of structure are: (1) large size; (2) circuit matching design is complicated, and the relative bandwidth is small , the relative bandwidth in Document 2 is small, only 11.2% (8.4-9.4GHz); (3) The transmission characteristics between ports are poor, and the isolation is relatively small

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