DocumentCode :
1017960
Title :
Analysis of the microstrip disk antenna element
Author :
Derneryd, Anders G.
Author_Institution :
Antenna Group, Moelndal, Sweden
Volume :
27
Issue :
5
fYear :
1979
fDate :
9/1/1979 12:00:00 AM
Firstpage :
660
Lastpage :
664
Abstract :
The circular microstrip antenna element is formed by a radiating disk closely spaced above a ground plane. It is modeled as a cylindrical cavity with magnetic walls which can be resonant in the transverse magnetic (TM) modes. The far fields and the radiation conductances for different mode structures have been calculated assuming a magnetic line current flowing along the perimeter of the disk. The directivity of a disk antenna excited in the dominant mode is between 4.8 dB and 9.9 dB, depending on the size. Losses, due to imperfect supporting dielectrics and to the finite conductivity of the conductors, have been derived by means of a perturbation technique. Graphs are given for design purposes showing the input impedance, the Q factor, and the radiation efficiency at resonance for different modes and thicknesses. The air-filled microstrip antenna has the highest efficiency and the broadest bandwidth at a given resonant frequency.
Keywords :
Antenna theory; Microstrip antennas; Bandwidth; Conductivity; Conductors; Dielectric losses; Impedance; Magnetic analysis; Magnetic resonance; Microstrip antennas; Perturbation methods; Resonant frequency;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1979.1142159
Filename :
1142159
Link To Document :
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