Reconfigurable UWB circularly polarized slot antenna with three modes of operation and continuous tuning range

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Bahrami, Sirous
Moloudian, Ghollamhosein
Song, Ho-Jin
Buckley, John L.
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In this paper, a tunable circularly polarized antenna with a reconfigurable integrated feed network is proposed for cognitive radio applications. The integrated feed network is composed of an ultra-wideband (UWB) band-pass filter (BPF), a continuously tunable T-shaped resonator, and an L-shaped microstrip line. The feed network employs 3 PIN diodes to switch between different RF paths, resulting in 3 modes of operation: an ultra-wideband mode (3.5-8.5 GHz), a narrowband bandpass (BP) mode and a narrowband bandstop (BS) mode. The continuous tuning range of the bandpass/bandstop narrowband mode is realized by two DC-controlled varactor diodes. The stand-alone antenna attains a -10 dB impedance bandwidth of 92.3 % (3.5-9.5 GHz), while it attains an Axial Ratio (AR) bandwidth of 88.3 % (3.1-8 GHz) in its wideband mode. The overlapped bandwidth (matching and AR) of the reconfigurable antenna is 78.2 % (3.5-8 GHz). The communicating state covers 80% of the sensing spectrum while maintaining circularly polarized radiation. The measured peak realized gain values for the wideband mode range from 2 to 3.2 dBic while the maximum gain for the narrowband mode ranged from 1.95 to 3.1 dBic. The measured results show that the proposed filtenna is suitable for UWB cognitive radio systems
Antennas , Band-pass filters , Circularly polarized antenna , cognitive radio , Microstrip antennas , microstrip slot antenna , Narrowband , reconfigurable antenna , Slot antennas , Transmitting antennas , Tuning
Bahrami, S., Moloudian, G., Song, H.-J. and Buckley, J. L. (2022) 'Reconfigurable UWB Circularly Polarized Slot Antenna with Three Modes of Operation and Continuous Tuning Range', IEEE Transactions On Antennas and Propagation, (6 pp). doi: 10.1109/TAP.2022.3161358
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