CAD model to compute the input impedance of tunable triangular patch antenna

To compute accurately the input impedance of an equilateral triangular patch antenna (ETMPA) with and without air gap, a simple and efficient CAD model based on cavity model analysis is proposed. The computed values for wide range of feed location and air gaps of an ETMPA with different antenna parameters are compared with different experimental and theoretical values available in open literature showing close agreement. This structure is also validated by employing a simulator.