Design of Compact Semi-circular Microstrip Antenna Loaded with Shorting Post

With an increase in the demand for personal communication systems, requirement of antennas occupying smaller area has increased which has led to the developments in compact antenna design. Many microstrip configurations using slots and shorting post have been reported. However reported work lacks in providing in-depth explanations about antenna working in terms of resonant modes and thus does not put forward any design guidelines. This paper presents a systematic study which highlight upon the behavior of antenna in terms of resonant modes of the shorted patch. Resonant length formulations for shorted patch modes and subsequent design procedure using the same have been presented, which serves as guideline in designing similar configurations at different frequencies.