Accession Number:

ADA051187

Title:

Analysis of the Microstrip Disk Antenna Element,

Descriptive Note:

Corporate Author:

ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s):

Report Date:

1977-11-01

Pagination or Media Count:

27.0

Abstract:

The circular microstrip antenna element is formed by a radiating disk closely spaced above a groundplane. It is modeled as a cylindrical cavity with magnetic walls that can be resonant in the TM modes. The far-fields and the radiation conductances for different mode structures have been calculated assuming a magnetic line current flowing around the perimeter of the disk. The directivity of the 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 dielectric and due to finite conductivity of the conductors, have been derived by means of a perturbation technique assuming small losses dont drastically change the fields from their loss-free case. Graphs are given for design purposes showing the input impedance, the Q-factor, and the radiation efficiency at resonance for different modes and spacings. The air-filled microstrip antenna has the highest efficiency and the broadest bandwidth for a given frequency. Author

Subject Categories:

  • Electrical and Electronic Equipment
  • Electricity and Magnetism
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE