This paper presents a comparison of on-body performances between omnidirectional (loop antenna) and reconfigurable beam steering\nantennas. Both omnidirectional and reconfigurable antennas were manufactured on the same fabric substrate and operated\nat the frequency band of the WLAN 802.11a (5.725ââ?¬â??5.85GHz). The reconfigurable antenna was designed to steer the beam\ndirections. In order to implement the beam-steering capability, the antenna used two PIN diodes. The maximum beam directions\nof three states (states 0, 1, and 2) were steerable in the YZ-plane (? = 2?, 28?, and 326?, resp.). The measured peak gains were 5.9ââ?¬â??\n6.6 dBi and the overall half power beam width (HPBW) was 102?. The measured results of total radiated power (TRP) and total\nisotropic sensitivity (TIS) indicated that the communication efficiency of the reconfigurable beam steering antenna was better than\nthat of the loop antenna. When the input power was 0.04W (16 dBm), the simulated specific absorption rate (SAR) values of the\nreconfigurable beam steering antenna on the body were less than 0.979 W/kg (1 g tissue) in all states, satisfying the SAR criteria of\nthe US.
Loading....