Abstract
In this paper, a compact circularly polarized (CP) substrate integrated waveguide (SIW) horn antenna is proposed and investigated. Through etching a sloping slot on the common broad wall of two SIWs, mode coupling is generated. During the coupling process along the sloping slot, the different guide wavelengths brings phase shift between two modes, which provides possibility for radiating CP wave. Moreover, the two different ports will generate the electric field components of TE01 mode with opposite direction, which indicates the compact SIW horn antenna with dual circularly polarized property can be realized as well. Results indicate that the proposed antenna operates with a wide 3-dB axial ratio (AR) bandwidth of 11.8% ranging from 17.6 GHz to 19.8 GHz.
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