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This paper presents a novel planar matching load for travelingwave-fed substrate integrated waveguide (SIW) slot arrays. The load consists of a planar grounded coplanar waveguide (GCPW) matching load and a planar GCPW to SIW transition which makes the GCPW matching load compatible with the SIW. In the GCPW matching load a high frequency resistor is used to dissipate the remaining power. A traveling-wave-fed SIW slot array with the novel load is designed, fabricated and measured. The measurement results show the proposed planar matching load performs well over a wide band 24.2–26.0GHz, and reflection coefficient and side lobe level (SLL) of the array is significantly reduced comparing with the array with no load.

Design of planar matching loads for traveling-wave-fed SIW slot arrays