Wide Angle Beam Scanning Method (BSM) for the WSN Communication Applications

Nowadays, ultra-high frequency (UHF) radio frequency identification (RFID) technique has rapidly been used for the application of multiple wireless sensor networks (WSN s) system. Additionally, it is very important to have a strengthen information signals at the receiver for which the exact location of the RFID tag must be traced at a particular boundary to be communicated properly. Therefore, in this paper, an advanced direction finding method namely the beam scanning (BS) along with a selective beam switching (SBS) system based on the electronically steerable parasitic array radiator (ESP AR) antenna is proposed to improve the signal link budget for the long distance communication, received the strengthen information signal from a particular direction, and QoS (quality of service) by minimizing the interference at the receiver in the interference channel. Beam scanning method (BSM) in the ESP AR antenna side is based on the magnitude of the received signal strength (RSS) of the tag's pilot carrier. The simulation results provide wide beam scanning angle range from -48 to 48 with a peak gain of 11 dBi and the scanning loss drops to 2 dB approximately from the peak gain due to the sub array pattern.