Slot-coupling directional coupler based on integrated substrate gap waveguide

Abstract

The invention discloses a slot-coupling directional coupler based on an integrated substrate gap waveguide. The coupler comprises two ISGW coupling waveguides with same structure, and each coupling waveguide comprises a via hole layer dielectric plate and a gap layer dielectric plate. One surface of the via hole layer dielectric plate is printed with a metal ground layer, the other surface of thevia hole layer dielectric plate is printed with a periodic circular metal patch and a coupling microstrip line, and metal via holes are formed in the circular metal patch and the coupling microstrip line; one surface of the gap layer dielectric plate is printed with a coupling microstrip line, and the other surface of the gap layer dielectric plate is printed with a metal ground layer with a coupling gap; the upper surface of each gap layer dielectric plate is tightly connected with the lower surface of the corresponding via hole dielectric plate to form the corresponding coupling waveguide; and the two coupling waveguides are tightly connected after 180-degree relative rotation. The slot-coupling directional coupler can overcome the disadvantages of an existing coupler, realizes broad broadband and relatively high isolation simultaneously, and has the advantages of easy integration, small size, adjustable coupling coefficient, broad broadband, relatively high isolation, applicabilityfor 5G frequency bands and the like.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a slot coupling directional coupler based on an integrated substrate gap waveguide. Background technique [0002] Directional coupler is an important microwave and millimeter wave device, which can be used for signal isolation, separation and mixing, such as power monitoring, source output power stabilization, signal source isolation, frequency sweep test of transmission and reflection, etc. The forms of couplers mainly include metal waveguide couplers and microstrip couplers. With the development of 5G communication systems, the frequency requirements for microwave and millimeter wave devices are getting higher and higher. However, the traditional metal waveguide coupler structure is not easy to integrate, and the microstrip coupler application has a large loss at high frequencies, which limits its in high frequency applications. [0003] Substrate Integrated Waveguide (Subst...

AI Technical Summary

Problems solved by technology

However, the SIW-based coupler still has the problems of space radiation and surface waves, and the size of the gap waveguide coupler is large, which is not suitable for integration

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