Title :
Numerical analysis of the annular-ring loaded circular-disk microstrip antenna
Author :
Nie, Z. ; Chew, W.C. ; Lo, Y.T.
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA
Abstract :
The annular-ring-loaded (ARL) circular-disk microstrip antenna with thick substrate and mutual coupling problem is analyzed using the stratified medium Green´s function and the spectral-domain formulation. The intent of the ARL microstrip antenna is to broaden the bandwidth of the antenna. Good agreement has been found between the numerical results and measured data in both resonance and input impedance analysis, even for an antenna with substrate thickness up to 0.1 wavelength. An ARL-disk antenna that had a thickness of 0.089 substrate wavelength and a relative bandwidth as high as 20% was designed. The radiation patterns in the E and H planes were very good, and the cross polarization was less than -6 dB.<>
Keywords :
Green´s function methods; antenna radiation patterns; electric impedance; microstrip antennas; numerical analysis; annular ring loaded circular disc antenna; bandwidth; cross polarization; input impedance; microstrip antenna; mutual coupling; numerical analysis; radiation patterns; resonance; spectral-domain formulation; stratified medium Green´s function; thick substrate; Antenna measurements; Bandwidth; Green´s function methods; Impedance measurement; Microstrip antennas; Mutual coupling; Numerical analysis; Resonance; Thickness measurement; Wavelength measurement;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1989. AP-S. Digest
Conference_Location :
San Jose, CA, USA
DOI :
10.1109/APS.1989.134906
