Abstract
A wideband air-filled ridge substrate integrated waveguide (AFRSIW) and its transition to microstrip are proposed first in this paper. The AFRSIW combines the broadband advantage of the ridge substrate integrated waveguide (RSIW) and the low loss of the air-filled SIW (AFSIW). Therefore, the AFRSIW allows for lower cut-off frequency and broader mono-modal bandwidth compared with AFSIW with same width and height, because of the involvement of the ridge made of an additional layer of dielectric substrate. Moreover, the AFRSIW has lower loss compared with RSIW due to the removal of the dielectric. The transition from AFRSIW to microstrip consists of a tapered microstrip line and two suppressing stubs. The tapered microstrip line is used to ensure impedance matching, and two suppressing stubs preventing the undesired radiation are introduced to improve the impedance match broadening the operating bandwidth of the transition. The AFRSIW together with the transition is simulated and optimized with HFSS. For demonstration, a back-to-back transition prototype is fabricated and measured. A mono-modal bandwidth of 77.6% with 15 dB return loss is obtained from 8.6 to 19.5 GHz.
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