Dielectric Resonator-Based Evanescent-Mode Waveguide Filtering Antenna

An inline configuration of a two-pole
$\boldsymbol{TE}_{01\delta }$
mode dielectric resonator-based evanescent-mode waveguide filtering antenna is presented. The proposed design ensures matching of complex admittance at small aperture of evanescent-mode open-ended waveguide (EMOEW) to real admittance of the generator across a 10 dB return-loss bandwidth of 3.7%. The EMOEW having cutoff frequency
$\boldsymbol{f}_{c}$
= 9.6 GHz, radiates with an endfire realized gain of 4.5 dBi at operating frequency
$f_{0}$
= 8.1 GHz. The presence of high-Q dielectric resonators provides sharp selectivity in filtering response, with a shape factor of 2.5 at 20/3 dB. The EMOEW has a small cross-section (0.42
$\lambda _{0}$
× 0.26
$\lambda _{0}$
) and yields a cross-polarization discrimination of 27 dB at
$f_{0}$
. The filtering antenna is fed by a propagating waveguide, making it suitable for high-power applications.