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Compact wideband double-layer half-mode substrate integrated waveguide 90°deg coupler

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3 Author(s)
Ali, A.A.M. ; LAAS, CNRS, Toulouse, France ; El-Shaarawy, H.B. ; Aubert, H.

Presented are two novel double layer substrate integrated waveguide (SIW)-based couplers, the longitudinal-slots-based broadwall SIW coupler and its corresponding half-mode SIW coupler. Coupling takes place through a set of narrow, offset slots, which feature a flexible design providing a wide coupling dynamic range with wideband characteristics. This technique provides a compact design through both the double layer scheme and the half-mode structure. Isolation and input reflection characteristics better than 15 dB and 13 dB, respectively, are experimentally validated over 24% fractional bandwidth at 12.5 GHz. Measured coupling magnitudes and phases exhibit dispersive characteristics lower than 1 dB, and 8 with respect to the adopted design values, respectively, over the entire frequency band.

Published in:

Electronics Letters  (Volume:47 ,  Issue: 10 )