DEVELOPMENT AND PERFORMANCE IMPROVEMENT IN MULTIBAND COAXIAL CONTINUOUS TRANSVERSE STUB ARRAY ANTENNA FOR SATELLITE APPLICATION
Continuous Transverse Stub (CTS) technology along with the coaxial lines can be used to produce the simple, light weight, low-loss microwave structures to provide omnidirectional radiation pattern in the horizon plane. The CTS antenna provides low reflection with good input impedance and high radiation efficiency. The C-band coaxial CTS antenna is designed to improve the radiation efficiency and gain. The proposed antenna operates at two frequencies, 4.74 GHz (downlink) and 6.984 GHz (uplink), in INSAT / Super Extended C-band. The basic theory is analyzed. Design and optimization is done using CST Microwave Studio commercial software. The simulation result shows the improvement in the performance of the C-band antenna. The radiation efficiency at 4.74 GHz and 6.984 GHz are obtained as 98.4% and 97.5%. The radiation pattern is omnidirectional in horizontal plane with the gain 5.56dB and 7.814dB respectively. The achieved impedance doesn’t worse the result obviously. This high efficiency, low cost antenna with 55% reduction in size can be used for satellite communication systems, personal communication systems and wireless communication. Terabit/s satellite services can also be provided by the antenna of this similar technology operating in Q-band.