Journal
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
Volume 24, Issue 4, Pages 221-223Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2013.2295297
Keywords
Directional coupler; millimeter-wave integrated circuits; substrate integrated waveguide (SIW)
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Funding
- Fonds de recherche du Quebec-Nature et technologies (FRQNT)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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This letter presents a new class of small-size and high performance directional coupler based on substrate integrated waveguide (SIW) technology. This type of coupler is composed of a waveguide section of four arms connected by a central junction. Quasi-optical coupler technique is realized on standard waveguide by simply inserting a slab with different permittivity in central section to act as a mirror. To make this coupler realizable in the SIW format, the air slab is simply implemented by rectangular through-hole. Characteristics of the proposed coupler with respect to various parameters are presented and discussed. A prototype at 10 GHz is designed, fabricated and measured. Experimental results show that the proposed SIW cruciform coupler has a bandwidth of more than 15% over the operating frequency range.
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