Proximity Fed Broadband Equilateral Triangular Microstrip Antenna Using Parasitic Rectangular Patches

Gap coupled design of proximity fed equilateral triangular microstrip antenna along with variations of rectangular microstrip antennas are proposed. Design of equilateral triangular microstrip antenna provides a bandwidth of 302 MHz (25 % ) with broadside gain of 7.6 dBi. Enhancement in bandwidth and gain is realized by gap coupling rectangular patches. Optimum result with VSWR bandwidth of more than 670 MHz (57%), showing peak gain of 9.7 dBi is obtained in gap coupled configuration with two adjacent layers of two and four rectangular patches. Proposed design is simpler in implementation and measured results show close agreement.