A Simple Dual-Band Antenna Using Half Mode Substrate Integrated Waveguide Technique with Low Cross Polarization

A novel dual-band half mode substrate integrated waveguide (HMSIW) cavity-based antenna with low cross polarization is presented in this paper. The proposed antenna is constructed on a single-layered substrate which excited by a coaxial probe, and by etching a rectangular slot near the open aperture side, dual resonant frequencies are realized in X band. Moreover, the energy is radiated into the free space by the open aperture side and the slot when the cavity resonating at different frequencies. The simulated result indicates that the proposed antenna has stable radiation patterns with a gain of 4.4-4.6 dBi as well as low cross polarization of larger than 23 dB, and a front-to-back ratio of larger than 10 dB over different operating frequencies.