Abstract
This study investigates a novel concept of using slot and Coplanar Waveguide fed antenna to obtain multiband operation. The compact antenna includes a star monopole patch with a slit gap and a Star-shape slot on the patch as the radiating part and Dual Square shaped slots on the material as the ground plane. The presentation of techniques in the star-shaped patch and ground plane expands the total length of the current path. This increasing makes the multiband antenna to operate at 4.9 (WLAN), 5.9 (upper WiMAX), 8.2 (satellite TV), 11.8 (X-band) and 17.7 GHz (Ku-band), respectively. The antenna has a physical dimension of 0.32lambda_{0} times 0.24lambda_{0} times 0.01lambda_{0} = (20 times 15 times 1) mm3, at the minimum frequency of 4.9 GHz. The proposed configuration operates at 4.9, 5.9, 8.2, 11.8 and 17.7 GHz with bandwidth (S11 < −10 dB) of about 90%, 74.7%, 53.8%, 8.4% and 4.7%, respectively for simulation part. The antenna exhibits measured bandwidth (S11 < −10 dB) of about 108%, 84%, 64%, 9%, and 7% at resonant frequencies of 4.69, 6.03, 7.99, 11.88, and 17.53 GHz, respectively. The stability of the radiation features, VSWR < 1.5 and good agreement impedance are noticed across the operating bandwidth of the multiband antenna.
Highlights
Nowadays, there are many demands for the new generation of wireless communication systems such as multi-frequency antennas, wide broadband antennas, and small size antennas for mobile and satellite communication systems
Multi-band antennas consist of various band frequencies that can be applied for more than applications of wireless communication like radar, mobile, and satellite communications [1]
This study shows that the antenna resonates at 4.9 (WLAN (802.11j)), 5.9, 8.2 (Satellite TV), 11.8 (X-band), and 17.7 GHz (Kuband) under simulation and at 4.69, 6.03, 7.99, 11.88, and 17.53 GHz in measurement testing, respectively
Summary
There are many demands for the new generation of wireless communication systems such as multi-frequency antennas, wide broadband antennas, and small size antennas for mobile and satellite communication systems. Multi broadband wireless antennas are usually designed by adding fractals [2], multi-split strips, feeding methods [3,4,5,6], print slots [7,8,9], etc These technologies face some critical points for instance low gain, narrow bandwidth and less efficiency characteristics.
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