DocumentCode :
1172564
Title :
Radiation modes in circular patch antennas
Author :
How, Hoton ; Vittoria, Carmine
Author_Institution :
ElectroMagnetic Appl. Inc., Boston, MA, USA
Volume :
42
Issue :
10
fYear :
1994
fDate :
10/1/1994 12:00:00 AM
Firstpage :
1939
Lastpage :
1944
Abstract :
We have formulated exact solutions of the normal modes in the microstrip patch antenna possessing circular geometry. The theory makes use of a new Green´s function in conjunction with current potential analysis. The calculations demonstrate that the magnetic wall confinement boundary conditions as formulated in past theories hold approximately true if the surface wave loss is minimal compared to other losses: dielectric loss, conductor loss, and radiation loss. For practical path antennas the normal modes are not confined locally near the microstrip patch. Rather, they are composed of propagation surface waves which extend far beyond the region containing the patch antenna. We term these normal modes as leaky modes, since they resemble the leaky modes found in dielectric image guides. Measurements by us of the radiation mode frequencies and the intrinsic Q-values of the microstrip patch antennas compared very well with theory
Keywords :
Green´s function methods; antenna theory; boundary-value problems; microstrip antennas; Green´s function; circular geometry; circular patch antennas; conductor loss; current potential analysis; dielectric image guides; dielectric loss; exact solutions; intrinsic Q-values; leaky modes; magnetic wall confinement boundary conditions; microstrip patch; microstrip patch antenna; normal modes; path antennas; propagation surface waves; radiation loss; radiation mode frequencies a; radiation modes; surface wave loss; Boundary conditions; Conductors; Dielectric losses; Geometry; Green´s function methods; Magnetic analysis; Magnetic confinement; Microstrip antennas; Patch antennas; Surface waves;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/22.320777
Filename :
320777
Link To Document :
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