Analysis of aperture antennas in inhomogeneous media
- Creators
- Damlamayan, Dikran
Abstract
The object of this report is to calculate the admittance and the radiation pattern of aperture antennas fed by waveguides of arbitrary cross-section and radiating into dielectric slabs, whose constitutive parameters may be functions of position along the direction normal to the slab faces. For a given aperture field distribution the antenna aperture admittance and the radiation field are expressed here, for the first time, in terms of two auxiliary quantities directly related to the plane wave reflection and transmission coefficients of the dielectric slab. These quantities are the input admittance of the dielectric slab and the ratio of the total electric field amplitude transmitted at one end of the slab to the transverse field at the other, both calculated for plane waves as a function of incident propagation direction. This approach introduces a great simplification in the solution of the problem, particularly in the case of an antenna radiating into an inhomogeneous dielectric slab. A simple and powerful method has been devised for the computation of the input admittance of an inhomogeneous dielectric slab as well as for the electric field ratio. In this case the impracticability of obtaining analytical results has necessitated the use of numerical techniques. Examples of the application of the theory to typical dielectric slabs are given and the results are discussed.
Additional Information
I wish to express my sincere gratitude to my research advisor Professor Charles Herach Papas, for his continued guidance and support during the course of this work, as well as for the unceasing encouragement and deep inspiration I received from him throughout my studies at the California Institute of Technology. I acknowledge with thanks the assistance of Miss Kikuko Matsumoto in computer programming, and the efforts of Mrs. Carol Teeter in typing the final manuscript. I also wish to thank Dr. Henri Hodara of Tetra Tech for his enthusiasm and interest in this work.Files
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Additional details
- Eprint ID
- 12291
- Resolver ID
- CaltechAUTHORS:DALantennalabrpt52
- Air Force Office of Scientific Research (AFOSR)
- Created
-
2008-11-04Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field
- Caltech groups
- Caltech Antenna Laboratory
- Series Name
- Caltech Antenna Laboratory Technical Report
- Series Volume or Issue Number
- 52
- Other Numbering System Name
- NTIS
- Other Numbering System Identifier
- AD0700818