Broadband Sectoral Microstrip Antennas

Abstract

Broadband sectoral microstrip antennas are proposed. The variation in sectoral angle changes the spacing between the first three patch resonant modes to yield bandwidth of more than 700 MHz (> 60%). Furthermore, the effects of variations in sector radius are presented. In a smaller sectoral angle, the sector radius optimizes the spacing between patch resonant modes to yield bandwidth of more than 850 MHz (~70%). Due to orthogonal surface currents at first and third resonant modes, the proposed antenna gives elliptical polarization with variation in gain from 8 to less than 4 dBi over the operating bandwidth.