Dual Band Sapphire Stacked RDR Aperture Coupled Antenna with Linear Polarization and Circular Polarization for C-Band Applications

A dual band rectangular dielectric resonator antenna is presented with exhibits linear polarization at a lower frequency band of 5.25 GHz-5.52 GHz which can be utilized for wireless communication applications and circular polarization at a higher frequency band of 7.47GHz- 7.95GHz which can be used for weather radar application as circular polarization reduces signal attenuation as well as reduces the adverse climatic conditions effect on signal. The novel design consists of four-layer structure with sapphire and TMM 13i stacked alternatively. Since sapphire and TMM13i are resistant to physical change they are best for C-Band applications. A patch with corners truncated and slot etched in it in order to attain dual band and two types of polarization respectively. The aperture coupled feed has been employed as it removes spurious feed radiation. The designed antenna has achieved an axial ratio>3dB and overall gain of 5dB. The VSWR (Voltage standing wave ratio) is less than 1 for both the bands. The design is simulated using HFSS.