Mutual Coupling Reduction Techniques in Microstrip Patch Antennas: a Survey

An important challenge in communication industry is to reduce the total size of devices. Similarly array size reduction has attracted increasing interest in recent years. Placing elements of an antenna array close to each other is certainly one way to reduce the total size of an array antenna. However, one of the factor called mutual coupling depends on inter element separation and relative orientation, causes undesirable effects on antenna characteristics. Therefore, within a compact structure of an antenna, reduction in mutual coupling in microstrip antennas is a major challenge.