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Pattern switching compact patch antenna for on-body and off-body communications at 2.45 GHz

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3 Author(s)
Chandran, A.R. ; Queen''s Univ. of Belfast, Belfast ; Conway, G.A. ; Scanlon, W.G.

The ability to switch between propagating modes is important for body-centric applications such as medical body area networks where a single node may need to be able to optimise communications for either on-body sensor links or off-body links to the wider network. Therefore, we present a compact 2.45 GHz active mode-switching wearable antenna for both on-body and off-body wireless communications. The single-layer patch antenna was pattern-switched using shorting pins and had an impedance bandwidth of 253 MHz and 217 MHz for the on-body and off-body radiating modes, respectively. An efficiency of 57 % and 56.8 % was obtained for on-body and off-body mode respectively when placed in close proximity to a phantom that represents a muscle issue at 2.45 GHz.

Published in:

Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on

Date of Conference:

23-27 March 2009