Design of ESPAR Antenna Array for High Gain Communication Services

Nowadays, the high gain directional antennas are very essential for any wireless communication system to reduce interference. In this paper, a new Electronically Steerable Parasitic Array Radiator (ESPAR) array antenna is presented for high gain communications and sensing. The antenna array (1x2) consists of two single ESPAR antennas with an optimum distance. The peak gain of the array antenna is 11.40 dB whereas the minimum gain is 9.95 dB. Approximately 3 dB gain increases as compared to the single ESPAR antenna (8.17 dB). The designed antenna could operate at the ISM frequency band of (2.40~ 2.50) GHz. The distance between the active and parasitic elements is chosen as λ/4 for optimum performance. To reduce the mutual coupling, the space between the two ESPAR antennas is selected as λ/8. This proposed array design of ESPAR antenna could be applied in many personal communications, ECG (electrocardiogram) monitoring system, Weather tracking, and in many others Wireless Sensor Networks (WSNs) applications.