Title :
Impedance matching of a dual-frequency microstrip antenna with an air gap
Author :
Lee, Choon Sae ; Nalbandian, Vahakn
Author_Institution :
Dept. of Electr. Eng., Southern Methodist Univ., Dallas, TX, USA
fDate :
5/1/1993 12:00:00 AM
Abstract :
A microstrip antenna has been proposed to operate at dual frequencies. The microstrip is a single layer patch with nonradiating edges closed with a conducting foil. Resonant frequencies are altered by varying the air gap under the patch. The separation of the resonant frequencies can be nearly zero and has no upper limit in principle. The input impedance is easily matched by shifting the air gap. The radiation patterns are not affected by modification for dual-frequency operation
Keywords :
impedance matching; microstrip antennas; air gap; conducting foil; dual-frequency operation; impedance matching; input impedance; microstrip antenna; nonradiating edges; radiation patterns; resonant frequencies; single layer patch; Antennas and propagation; Bandwidth; Cutoff frequency; Fourier transforms; Impedance matching; Microstrip antennas; Polarization; Radar scattering; Resonant frequency; Time frequency analysis;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
