Wide Band Design of Half Equilateral Traingular Microstrip Antenna Using 30° Sectoral Patches

Abstract

Compact configuration of electromagnetically coupled half-equilateral triangular microstrip antenna, using proximity feed is discussed which gives 355 MHz (28.1%) of bandwidth. Further compact gap-coupled designs of half-equilateral triangular patch with 300 Sectoral patches are proposed. Gap-coupled design with single 300 Sectoral patch realizes impedance bandwidth of 478 MHz (37.52%) which is 9% higher than bandwidth obtained in single patch configuration. Gap-coupled antenna employing two 300 Sectoral patches coupled along triangular patch side length gives maximum bandwidth of 613 MHz (45.16%). This bandwidth is more than 15% as compared to the bandwidth obtained from half equilateral triangular patch. As the patches are coupled along the side length in triangular patch, it do not increase effective antenna area and thus configuration is compact in design. Bore-sight pattern across impedance bandwidth with maximum gain of 8 dBi is obtained in proposed multi-resonator design. Keywords—Gap-coupled microstrip antenna, Compact Half equilateral traingular microstrip antenna, 300 Sectoral microstrip antenna, Proximity feeding.