Abstract
A planar substrate integrated circular polarized (CP) antenna is proposed using a pair of wideband ±45o slot radiators for Q-band wireless applications. The introduced radiator is a modified top-wall 45o slot on the broadside of a substrate integrated waveguide (SIW), and the SIW is terminated with a ±45o short-circuit end together with a pair of inductive via is adopted for impedance matching, both of which contribute to a wideband performance. By connecting a pair of ±45o slots to a 90o SIW directional coupler, a CP antenna is implemented with a wide axial ratio (AR) and impedance bandwidth. The proposed antenna has a wide AR bandwidth of 14% from 42.1 to 48.5GHz with gain>5.5 dBic and S11<−15dB.
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