Broadband Gap-coupled Variations of Equilateral Triangular Microstrip Antennas

Various broadband multi-resonator gap-coupled configurations of equilateral triangular microstrip antenna and its compact variation, half equilateral triangular microstrip antenna, are proposed. The broadband proximity fed equilateral triangular microstrip antenna yields bandwidth of more than 650 MHz (~44%), whereas equivalent proximity fed gap-coupled half equilateral triangular microstrip antennas yields bandwidth of more 700 MHz (~47%). The bandwidth of proximity fed equilateral triangular and half equilateral triangular microstrip antennas is further increased by using gap-coupled configurations with equal and unequal dimensions compact half equilateral microstrip antennas. These gap-coupled configurations yields bandwidth of more than 800 MHz (>50%) with broadside radiation pattern and peak gain of nearly 8 dBi.