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Design and analysis of TX/RX dual microstrip antenna using FDTD at Ku-band

Design and analysis of TX/RX dual microstrip antenna using FDTD at Ku-band

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A TX/RX dual microstrip 8×4 array antenna for satellite communication is designed, fabricated and measured and its element characteristics are analysed using finite difference time domain (FDTD). TX/RX frequency ranges are 14.0–14.5 GHz, 11.7–12.75 GHz, respectively, and vertical and horizontal polarisations are used for TX and RX. This antenna uses microstrip direct feeding for RX and aperture coupled stripline feeding for TX and accommodates stacked elements for a high directivity and wide impedance bandwidth. FDTD gives more accurate results because of the consideration of finite structure and imperfect two ground planes. This element has a return loss below −8 and −14 dB over the TX and RX frequency ranges and a gain of 7.5 and 8.3 dBi at the centre frequency of TX and RX. Return loss below −10 and −14 dB and a gain of 21.4 and 20.0 dBi were achieved for the TX and RX array, respectively.

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