Band‐ and frequency‐reconfigurable circularly polarised filtenna for cognitive radio applications. Issue 7 (18th March 2019)

• Record Type: Journal Article
• Authors: Wen, Zheng; Tang, Ming‐Chun; Ziolkowski, Richard W.
• Is Part Of: IET microwaves, antennas & propagation. Volume 13:Issue 7(2019)
• Page Start: 1003
• Page End: 1008
• Publication Date: 2019-03-18
• Subjects: cognitive radio -- electromagnetic wave polarisation -- antenna radiation patterns -- broadband antennas -- microwave antennas -- microstrip antennas -- varactors -- p‐i‐n diodes; frequency‐reconfigurable circularly polarised filtenna -- cognitive radio applications -- out‐of‐band rejection -- continuously tunable narrowband states -- switchable operational states -- wideband state -- tunable state -- impedance bandwidths -- single PIN diode -- band‐reconfigurable performance -- frequency‐reconfigurable performance -- operational communication frequencies -- axial ratio bandwidths -- frequency 2.44 GHz to 3.19 GHz -- frequency 2.52 GHz to 3.53 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2018.5963
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : A band‐ and frequency‐reconfigurable circularly polarised (CP) filtenna that exhibits good selectivity and out‐of‐band rejection in both its wideband and continuously tunable narrowband states is reported for cognitive radio (CR) applications. The filtenna provides two switchable operational states: a wideband state from 2.52 to 3.53 GHz for sensing and a tunable state of narrowband states from 2.44 to 3.19 GHz for communications. The corresponding 3‐dB axial ratio bandwidths completely overlap these impedance bandwidths. A single PIN diode is utilised to switch between these two operational states to achieve the band‐reconfigurable performance. Two varactor diodes are employed to realise the frequency‐reconfigurable performance by facilitating a continuous shift of the narrowband states over the operational communication frequencies.