Broadband substrate integrated waveguide (SIW) phase shifter loaded with rectangular air slots

Abstract

A phase shifter is one of key modules in microwave and millimeter wave circuit and system, and is widely applied to the aspects of phased array beam forming, orthogonal circuit design, instrument and equipment testing and the like. The invention proposes a substrate integrated waveguide (SIW) phase shifter loaded with rectangular air slots. The phase shifter comprises two typical SIW circuit structures of a branch circuit I and a branch circuit II. The branch circuit I corresponds to a referenced zero phase; and a plurality of rectangular air slots are formed in an SIW body in the circuit structure of the branch circuit II and correspond to required phase shifting degrees. The branch circuit II further comprises a one-side metalized dielectric PCB cover plate matched in size with the SIW body. Four metalized matching through holes are introduced in upper and lower parts of the edge, connected with the SIW body, of a gradual transition structure. The phase shifter realizes relatively wide frequency bandwidth and has relatively low insertion loss and fixed zero phase reference value; and the phase shifter can be conveniently integrated with other planar passive and active circuits, can be realized on a PCB and is relatively low in cost and convenient and reliable to machine.

Description

technical field [0001] Phase shifter is one of the key modules in microwave and millimeter wave circuits and systems, and it is widely used in phased array beamforming, quadrature circuit design, testing equipment, etc. A substrate integrated waveguide (SIW) phase shifter loaded with a rectangular air slot can be applied in a substrate integrated waveguide (circuit) to realize overall design and broadband phase shifting function. technical background [0002] Substrate-integrated waveguide SIW is a new form of microwave transmission line, which uses metal vias fabricated on a dielectric substrate to achieve a field propagation mode similar to a metal waveguide. SIW is a transmission line between microstrip and dielectric-filled metal waveguide. It takes into account the advantages of traditional waveguide and microstrip transmission line, and can realize high-performance microwave millimeter wave planar circuit structure. [0003] A phase shifter is a very important microwa...

AI Technical Summary

Problems solved by technology

The actual measurement results are not clearly given)

[0008] The first type of phase shifter realizes phase self-compensation based on the delay line and unequal width SIW structure. Although it has good amplitude and phase characteristics, its reference phase reference is variable, that is, there is no fixed zero phase reference value in theory. In practical applications, the system will become complex and redundant due to multiple zero-phase reference values; the bandwidth of the second phase shifter needs to be improved within the range of its defined phase shift accuracy; the insertion of the third phase shifter The loss is relatively large (about -5dB), and the test bandwidth is narrow, so the practicability is questionable

All three methods have their own limitations

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