A 3-D Printed Circularly Polarized Filtering Antenna

In this paper, a novel circularly polarized filtering antenna is designed and fabricated. It consists of five resonators and four of them have radiation apertures in the end. Each radiation aperture is truncated to implement left-hand circular polarization. Moreover, high gain can be achieved with the four radiation apertures. The proposed antenna is characterized with a second-order Chebyshev bandpass response with center frequency of 32 GHz and impedance bandwidth of 450 MHz. In order to minimize its size, weight and cost, the antenna is fabricated using 3D-printing technology with ceramic filled resin.