One of the typical plots shown in Fig. 2. The expression was subsequently used to verify the measurement of ‘Cp’ in H-plane configuration of the measurement of past workers Jedlicka et.at (Fig. 3a & 3b) & Penard et.al (Fig. 4). The agreement between theoretical model and measurement was found to be good. This expression can be readily used in the computer aided design Microstrip antenna at arrays.