volume | PIER Journals

Abstract

Aperture efficiency determines the percentage of radiation power incident upon the antenna available at the feed-point. Because the geometry of reflector is fixed, the behavior is primarily a function of the feed. The feed line that connects (transmit/receive) RF to the feed becomes an integral part of the system, so achieving maximum aperture efficiency depends on the capacity of feed line. This paper proposes a microstrip feed line behavioral model for parabolic reflector antenna systems, using an open loop characterization approach. Dielectric material loss intensity varies from material to material. This is consequently used for the effective design of feed line, because characteristic impedance of transmission line varies with material type and the material properties. This causes the reflection loss due to mismatched impedance at the source and load. Loss tangential factor of each material has significant effect on the loss profile. The developed model is analyzed with losses of the feed pattern, and the distance between the edge and the vertex. The proposed attenuation factor can be used to predict loss intensity per feed line length, at different terrestrial and satellite communications frequency bands.

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Dr. Oluwole John Famoriji

Dr. Thokozani Shongwe