electronically steerable parasitic array radiator (ESPAR) antenna switched-beam antenna wireless sensor network (WSN) received signal strength (RSS) Antenna radiation patterns Direction-of-arrival estimation Directive antennas Estimation Internet of Things (IoT) Switches Switching circuits Wireless sensor networks anechoic chambers (electromagnetic) antenna arrays antenna radiation patterns array signal processing calibration direction-of-arrival (DoA) direction-of-arrival estimation directionof- arrival (DoA) electronically reconfigurable superstate (ERES) antenna reconfigurable antenna steerable antenna superstrate antenna