Effect of Mutual Coupling on Microstrip Antenna

The purpose of this study is to observe the effect of mutual coupling on microstrip antenna (MSAs). A modification is done in such a way that, a gap coupling is used to increase the separation between the frequency bands. Before this phenomenon was introduced, there were problems such as destructive interference caused by the multiple resonant frequencies which implies the mutual coupling effect. In multi-resonant configurations, separation between the resonant frequencies is varied to make them operate in desired frequency band. The separation between the resonant frequencies of individual elements, is sufficiently increased and by appropriately providing the matching for different resonances, dual or multi frequency operation is obtained. Also, a brief summary of radiation characteristics of these microstrip antennas is presented, which can help in deciding whether these structures are suitable for their use in various applications with particular requirement for radiation pattern.A model is designed to resonate at 750 MHz and 1.16 GHz, which gives two resonant frequencies.