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This letter proposes a planar passive circularly polarized (CP) retrodirective antenna (RDA) array for vehicle radar applications. Different than the linearly polarized RDA arrays, the retrodirective signal generated by the CP RDA arrays can easily be extracted due to the orthogonal polarized character of the scattering and retrodirective signals. Circular polarization is achieved by a substrate integrated...
In this paper, a cavity-backed substrate integrated waveguide (SIW) antenna with two reconfigurable circular polarizations is proposed and investigated. The circular polarizations are generated by a combination of complementary square split ring on the top layer and a shorting via between the top layer and the ground plane which introduces current perturbation. The polarization states of the proposed...
This paper proposes a planar antenna having two realizable circular polarizations. The proposed antenna can radiate with either right hand circular polarization (RHCP) or left hand circular polarization (LHCP) by using different feeding ports. The substrate integrated waveguide (SIW) cavity is used in the antenna designs, and a single grounded coplanar waveguide (GCPW) is employed as the feeding element...
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