Title :
Design of narrow-width Fermi antenna with circular radiation pattern
Author :
Sato, Hiroyasu ; Sawaya, Kunio ; Wagatsuma, Yoshihiko ; Mizuno, Koji
Author_Institution :
Graduate Sch. of Eng., Tohoku Univ., Sendai, Japan
Abstract :
The design of the Fermi antenna as a receiving element of PMMW imaging is presented. Using the FDTD analysis, it has been found that the beamwidth of the E-plane and the H-plane of the Fermi antenna can be controlled by changing the width of the aperture and the position of the inflection point of the Fermi-Dirac taper profile respectively. Using these characteristics, a Fermi antenna with circular radiation pattern having a beamwidth of 52° and geometrical width of 0.58λ0 which fits to the f/D=1 optics have been obtained.
Keywords :
antenna radiation patterns; aperture antennas; finite difference time-domain analysis; microwave imaging; receiving antennas; E-plane; FDTD analysis; Fermi-Dirac taper profile; H-plane; PMMW imaging; aperture width; circular radiation pattern; inflection point position; narrow-width Fermi antenna; receiving element; Antenna arrays; Antenna radiation patterns; Aperture antennas; Dielectric substrates; Finite difference methods; Geometry; High-resolution imaging; Image resolution; Lenses; Time domain analysis;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1330305
