Investigations of a Dieleric Resonator Antenna for ISM, WLAN and C-Band Applications

The paper presents the development and experimental analysis of a triple band dielectric resonator antenna (DRA). The ground plane and feeding line was printed on FR-4 substrate. The antenna has been excited using aperture coupling. The antenna was loaded with an indigenously prepared hexagonal shaped ceramic (Al2O3) dielectric material of permittivity 9.6 and loss tangent 0.0003. The proposed antenna was designed and simulated with the help of CST Microwave Studio. It was practically fabricated and the results were verified using Vector Network Analyzer (VNA). A promising match between simulated and measured results was found. The fabricated DRA resonates at three different frequencies in S and C bands with bandwidths of 191 MHz (2.347 GHz2.538GHz), 331 MHz (4.63 GHz-4.961 GHz) and 609 MHz (5.649 GHz-6.258 GHz). The VSWR is under the magnitude of 2 for all the three bands and the Return Loss (RL) at resonance of the bands is -21.18 dB, -36.48 dB and -32.48 dB respectively. A good impedance matching at the resonant frequencies is achieved. The designed DRA is a good candidate for ISM (Industrial, Scientific and Medical) and C-band radar, Wireless LAN (WLAN) and satellite applications.