A Study on Communicaton Antenna Isolation
HOWARD UNIV WASHINGTON DC SCHOOL OF ENGINEERING
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Problems on FAA communication antennas related to isolation are analyzed. The concpet of using progressively phased circular array to achieve high isolation is studied. The method of study is divided into theoretical and experimental. Theoretical study involved using moment method. Symmetrical dipoles were used as elements. Factors analyzed include array radius, antenna size, position accuracy, impedance, radiation pattern, and isolation. The experimental study involved building scale antennas from existing FAA coaxial dipoles and used them as array elements, and simulated matrix feed conditions to study isolation and radiation pattern. An isolation of 55 db was found possible. The concept is shown to provide high isolation in a very limited space. It provides flexibility for beam forming, and azimuth scanning.
- Electrical and Electronic Equipment
- Air Navigation and Guidance