Small broadband substrate integrated waveguide planar magic-T structure

Abstract

The invention relates to a small broadband substrate integrated waveguide planar magic-T structure, which comprises an upper layer of metal surface, a middle layer of metal surface and a lower layer of metal surface of a dielectric substrate. The dielectric substrate is provided with two rows of parallel metal posts, and a slot line structure etched out from the middle layer of metal surface so as to greatly realize the energy transmission from a microstrip line to substrate integrated waveguide (SIW). The adopted equal power division network of the substrate integrated waveguide (SIW) replaces the traditional branch structure, so that the volume of the whole planar magic-T structure is decreased to a half of the volume of the past substrate integrated waveguide (SIW) planar magic-T structure, the relative bandwidth of work of the magic-T is greatly increased, and the planar magic-T structure has good isolation characteristics with a difference arm and an equal power division port. The small broadband substrate integrated waveguide (SIW) planar magic-T has simple design, small volume and good electrical property and is easy to be integrated with other planar microwave millimeter wave circuits.

Description

technical field [0001] The invention belongs to microwave and millimeter wave hybrid integrated circuits, in particular to a novel small broadband substrate integrated waveguide planar magic T structure with a floor slot 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. The traditional waveguide magic T structure is large in size, and it is difficult to realize a broadband matching circuit, so the transmission bandwidth is average. less than 10%. The planar magic T structure realized by using the mature design platform of SIW (Substrate Integrated Waveguide) combines the advantages of rectangular waveguide and microstrip line, and has the advantages of small size, light weight and relatively wider bandwidth. , and at the same time can withstand a higher power threshold, and the Q value is relatively high. Both theory and experiments have shown that this type of p...

AI Technical Summary

Problems solved by technology

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

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