Title :
Nonradiative dielectric (NRD) rotman lens with gap-coupled unidirectional dielectric radiator (UDR)
Author :
Jae-Gon Lee ; Jeong-Hae Lee ; Heung-Sik Tae
Author_Institution :
Dept of Radio Sci. & Commun. Eng., Hong Ik Univ., Seoul, South Korea
Abstract :
In this paper, nonradiative dielectric (NRD) rotman tens with a gap-coupled unidirectional dielectric radiator (UDR) has been presented. Design parameters of UDR such as length of resonator and distance of gap are determined using an equivalent circuit model of an evanescent NRD guide. Experimental prototype is fabricated and measured around 38 GHz. The result shows a good agreement with theory. Finally, total beam pattern of NRD rotman lens of multi-beam feed has been obtained using a measured pattern of UDR and army factor of NRD rotman lens. The obtained beam pattern shows remarkably suppressed side lobe.
Keywords :
antenna feeds; antenna radiation patterns; dielectric resonator antennas; equivalent circuits; lens antennas; millimetre wave antennas; 38 GHz; E-plane radiation pattern; design parameters; equivalent circuit model; evanescent guide; gap-coupled unidirectional dielectric radiator; multibeam feed; nonradiative dielectric rotman tens; resonator length; return loss; total beam pattern; Conductors; Dielectric loss measurement; Dielectric measurements; Equivalent circuits; Feeds; Lenses; Prototypes; Radar antennas; Waveguide discontinuities; Waveguide transitions;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1220366
