Title :
Analysis of a cavity-backed annular slot antenna with one point shorted
Author :
Morishita, Hisashi ; Hirasawa, Kazuhiro ; Fujimoto, Kyohei
Author_Institution :
Inst. of Appl. Phys., Tsukuba Univ., Japan
fDate :
10/1/1991 12:00:00 AM
Abstract :
Analysis of a cavity-backed annular slot antenna with one point shorted is performed experimentally and theoretically. Resonance frequencies, bandwidths, and radiation patterns are studied with respect to slot width, cavity depth, and slot shorting position. In the theoretical analysis, the method of moments is applied to find the magnet current on the slot, and the Green´s function for the field inside the cavity has been newly derived. By selecting a slot shorting position, circular polarization, and a bandwidth of more than 10%, the voltage standing-wave ratio (VSWR) ⩽2 for the input impedance is obtained
Keywords :
antenna radiation patterns; electric impedance; waveguide antennas; Green´s function; VSWR; bandwidth; cavity depth; cavity-backed annular slot antenna; circular polarization; input impedance; magnet current; method of moments; radiation patterns; resonance frequency; slot shorting position; slot width; voltage standing-wave ratio; Antenna radiation patterns; Antenna theory; Bandwidth; Green´s function methods; Magnetic analysis; Magnetic resonance; Moment methods; Performance analysis; Resonant frequency; Slot antennas;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
