Multi-resonator Variations of 120° Sectoral Microstrip Antennas for Wider Bandwidth

Sectoral Microstrip Antennas are realized by modifying the circular microstrip antennas. In this paper, proximity-fed design of 120° Sectoral microstrip antenna is discussed first. It yields bandwidth of nearly 650 MHz (~49%) with antenna gain of above 8 dBi in 1200 MHz frequency range. To enhance the bandwidth and gain of 120° Sectoral microstrip antenna, its various gap-coupled configurations coupled along the diagonal axes are proposed. Configurations with either single patch or two patches gap-coupled along diagonal axis are discussed with variations in the coupling edges. A maximum bandwidth of more than 1000 MHz (>70%) is realized for specific configurations of 120° patches, when they were coupled along both diagonal axes. In all gap-coupled variations, broadside MSA gain is nearly 9 dBi with pattern maximum in boresight direction is observed.