A Novel Compact Cavity-backed Planar Spiral Antenna with Dual-band Coaperture Design

In this paper, a compact design of co-aperture cavity-backed planar spiral (CBPS) antenna for 2~40GHz is presented. This novel design integrates two separate bands of apertures into a single radome which can effectively decrease radar cross section (RCS) and installation difficulties. The FDTD based CST Microwave Studio is used for the antenna modelling and simulation. Moreover, measurement results reveal good performance over both frequency bands, therefore this proposed antenna can be considered as a candidate to replace the conventional design with separate apertures.