Title :
Stacked-patch antenna with switchable propagating mode for UHF body-centric communications
Author :
Scanlon, William G. ; Chandran, Anupam R.
Author_Institution :
Inst. of Electron., Commun. & Inf. Technol., Queen´´s Univ. of Belfast, Belfast
Abstract :
The ability to electronically switch between off-body and on-body communications is a useful feature for wearable antenna applications. Therefore, we present a novel stacked-patch antenna with a switched propagation mode for body-centric communications at 2.45 GHz. Mounted 2 mm above a muscle-tissue phantom and in the on-body mode, the proposed single-port antenna had an efficiency of 62% and an impedance bandwidth of 70 MHz. The antenna performance increased in the off-body mode with an efficiency of 80% and an impedance bandwidth of 247 MHz. In terms of on-body coupling in anechoic conditions, peak |S21| path gains of -39.6 dB and -48.0 dB were obtained for the on-body and off-body configurations, respectively. These results clearly demonstrate the mode isolation obtained.
Keywords :
UHF antennas; biomedical communication; electromagnetic wave propagation; microstrip antennas; UHF body-centric communications; bandwidth 247 MHz; bandwidth 70 MHz; efficiency 62 percent; efficiency 80 percent; frequency 2.45 GHz; gain -39.6 dB; gain -48.0 dB; impedance bandwidth; muscle-tissue phantom; on-body coupling; single-port antenna; stacked-patch antenna; switchable propagating mode; wearable antenna applications; Antenna radiation patterns; Antennas and propagation; Biosensors; Communication switching; Feeds; Imaging phantoms; Switches; UHF antennas; UHF propagation; Wireless sensor networks;
Conference_Titel :
Antenna Technology, 2009. iWAT 2009. IEEE International Workshop on
Conference_Location :
Santa Monica, CA
Print_ISBN :
978-1-4244-4395-6
Electronic_ISBN :
978-1-4244-4396-3
DOI :
10.1109/IWAT.2009.4906964
