Title :
Comparison of the Performance of Double-Step Rectangular Dielectric Resonator Antennas
Author :
Almpanis, G. ; Fumeaux, C. ; Vahldieck, R.
Author_Institution :
ETH Zurich, Zurich
Abstract :
In this paper, numerical and experimental investigations on various wideband Dielectric Resonator Antennas (DRAs) are reported. The coaxial-fed two-step rectangular DRA has been proposed as a wideband antenna, characterized by easy fabrication, wide impedance bandwidth and stable radiation characteristics. Its operation relies on the excitation of multiple modes at nearby frequencies in order to obtain a wide impedance bandwidth through the overlap of their resonances. Here, this operational concept is further enhanced. It is shown that the impedance bandwidth of "flipped" double-step DRAs is significantly improved, due to the decrease of the radiation Q-factor of the excited modes. Therefore, similar DRAs may present a very different performance for the same feeding scheme and excited modes, depending on the DRAs\´ orientation with respect to the ground plane.
Keywords :
broadband antennas; dielectric resonator antennas; double-step rectangular dielectric resonator antennas; wideband antenna; Bandwidth; Broadband antennas; Coaxial components; Dielectric resonator antennas; Fabrication; Frequency; Impedance; Polarization; Probes; Q factor; Rectangular dielectric resonator antenna; probe coupling;
Conference_Titel :
Electromagnetics in Advanced Applications, 2007. ICEAA 2007. International Conference on
Conference_Location :
Torino
Print_ISBN :
978-1-4244-0767-5
Electronic_ISBN :
978-1-4244-0767-5
DOI :
10.1109/ICEAA.2007.4387447