Title :
Theory and experiment of the hemispherical cavity-backed slot antenna
Author :
Leung, K.W. ; Chow, K.Y.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, Hong Kong
fDate :
8/1/1998 12:00:00 AM
Abstract :
The hemispherical cavity-backed slot antenna is studied theoretically and experimentally. The exact magnetic field Green´s function of the cavity is derived rigorously and expressed in a form convenient for numerical computation. The moment method is used to find the equivalent magnetic current in the slot and, hence, the input impedance of the antenna configuration. The effects of the cavity size, of the slot length, and of the slot offset on the input impedance are studied and very good agreement between theory and experiment is obtained. The variation of the magnetic current around the slot and cavity resonances are discussed. Comparisons between the rigorous solution and the single-mode theory are given and the limitation of the single-mode theory is discussed
Keywords :
Green´s function methods; antenna theory; cavity resonators; convergence of numerical methods; electric impedance; method of moments; slot antennas; cavity resonance; cavity size effect; equivalent magnetic current; hemispherical cavity-backed slot antenna; input impedance; magnetic field Green´s function; moment method; numerical computation; rigorous solution; single-mode theory; slot length effect; slot offset effect; Admittance; Antenna theory; Apertures; Electromagnetic waveguides; Impedance; Magnetic fields; Magnetic resonance; Magnetic separation; Moment methods; Slot antennas;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
