Compact Reconfigurable Waveguide Filtering Antenna

• Published in: IEEE antennas and wireless propagation letters 2023-02, Vol.22 (2), p.1-5
• Main Authors: Singhal, Dristi, Singh Chauhan, Shakti, Dhwaj, Kirti
• Format: Article
• Language: English
• Subjects: Antennas; Apertures; constant absolute bandwidth (CABW); constant realized gain (CRG); constant shape factor (CSF); Couplings; dielectric resonator (DR); Dielectric resonator antennas; Fasteners; Filtering; Filtration; Frequency variation; Reconfigurable filtering antenna (RFA); Reconfiguration; Selectivity; Shape; Shape factor; Superhigh frequencies; Tuning; Wave propagation; Waveguides
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2022.3213721

A dielectric resonator (DR) loaded frequency reconfigurable X-band evanescent-mode waveguide filtering antenna is presented. The methodology for providing simultaneous constant absolute bandwidth (CABW), constant shape factor (CSF) and constant realized gain (CRG) with variation of operating frequency (\boldmath f_{0}) of filtering antenna is described. The proposed reconfigurable filtering antenna (RFA) provides 10% of \boldmath f_{0} tuning with a 10-dB \boldmath S_{11} CABW of 350 MHz, while maintaining an end-fire realized gain of 5.8 \pm 0.1 dBi over the tuning range. The high-Q DRs are responsible for appreciable gain and sharp selectivity with a shape factor of 1.68 \pm 0.01 at 10/3 dB. The wide beamwidth RFA radiates from a small aperture of size \boldmath 0.43\lambda _{0} × 0.27\lambda _{0}, where \lambda _{0} is the free space wavelength at the lowest f_{0} in the tuning range. Finally, the RFA is fed by a standard propagating waveguide, making it apt for high power applications.