A study of backfire microstrip antenna as a primary radiator

Abstract

This paper proposes a compact backfire circular patch antenna (BCPA). The BCPA is fed from radiation aperture (patch side) by a coaxial cable, which acts as a support structure for a primary radiator of reflector antenna. A balun is used to improve the tilted radiation pattern produced by an unbalanced current on the feeding coaxial cable. We show that antenna characteristics of the BCPA is stable by using balun in both the simulation and measurement. The proposed BCPA is compact and easy to fabricate.