Cross-Polarization Level In Radiation from a Microstrip Dipole Antenna.

The cross-polarization level, inherent in radiation from a small horizontal electric dipole (HED) on a flat grounded dielectric substrate, is investigated in detail. The study is directed toward the design of a very low cross-polarization level in a linear array of microstrip antenna elements. Field expressions for a microstrip HED are derived in spherical coordinates with respect to the array direction. In particular, two important cases, namely, an HED along the array direction (i.e., parallel polarization) and an HED perpendicular to array direction (i.e., perpendicular polarization) are investigated. Extensive numerical examples for the cross-polarization levels are given. It is shown that, in general, there are inherent limitations in achieving very low cross-polarization levels.

Main Author: Hoorfar, Ahmad.
Other Authors: Gupta, Kuldip C., Chang, David C.
Language: English
Published: 1988
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