Beam Control and Interference Nulling of ESPAR Antenna for WSN Communication

Abstract

Abstract It is very important to have reliable information signal at the receiver of the UHF (ultra-high frequency) RFID (radio frequency identification) communication system. For this goal, an exact location of the RFID tag must be traced, and the definite direction from the RFID reader to the RFID tag must be stated at the particular boundaries to be communicated properly. In this paper, an advanced direction finding method based on the beam scanning (BS) is studied to receive the stronger information signal from a particular direction. Unlike the traditional systems i.e. peak searching (PS) and symmetrical constant (SC), the beam scanning method (BSM) in the ESPAR (electronically steerable parasitic array radiation) antenna provides efficient advantages to find out the direction, location of tags, and to receive the signals. Likewise, a selective beam switching (SBS) system by designing ESPAR antenna is proposed to minimize the interference. To be noted, the beam scanning method (BSM) is the prerequisite process of the selective beam switching (SBS) since there is an appropriate system configuration about the tag’s location, direction finding, and the optimum SNR (signal to noise ratio) by suppressing noise and interference. The work can be applied into the wireless ECG monitoring system by providing better advantages such as higher accuracy, longer range and the longer battery life span. The antenna nulling is very good to enhance SIR (Signal to Interference Ratio) performance of the system. Thus, it can be concluded that the proposed design is a reliable, robust, relatively long distance, and low power WSN (wireless senor network) communication system and IoT communication networks.