Analysis of biconical microstrip antennas

Author

Lin, Y. ; Shafai, L.

Author_Institution

Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada

Volume

139

Issue

6

fYear

1992

fDate

12/1/1992 12:00:00 AM

Firstpage

483

Lastpage

490

Abstract

Biconical microstrip antennas having a conical patch over a conical substrate are investigated. Analytical expressions for the field distribution inside the conical cavity are developed in a spherical coordinate system and used to determine the eigenvalues of the resonant modes. It is found that, in addition to the axially symmetric modes, TE modes can also resonate which are asymmetric and dependent on the azimuthal angle. For coaxial probe excitation of the cavity, analytic expressions for the field components are determined and used to investigate the antenna input parameters and radiation patterns. The special case of a conical patch microstrip antenna with a planar substrate is also studied. It is shown that, in comparison with circular disc microstrip antennas, a conical patch yields a wider impedance bandwidth and higher gain

Keywords

antenna radiation patterns; antenna theory; eigenvalues and eigenfunctions; electric admittance; electric impedance; microstrip antennas; TE modes; antenna input parameters; axially symmetric modes; azimuthal angle; biconical microstrip antennas; coaxial probe excitation; conical cavity; conical patch; conical substrate; eigenvalues; field distribution; gain; impedance bandwidth; planar substrate; radiation patterns; resonant modes; spherical coordinate system;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings H

Publisher

iet

ISSN

0950-107X

Type

jour

Filename

180450