Citation:Buckley, J. L., McCarthy, K. G., Gaetano, D., Loizou, L., O'Flynn, B. and O'Mathuna, C. (2017) 'Design of a compact, fully-autonomous 433 MHz tunable antenna for wearable wireless sensor applications', IET Microwaves, Antennas and Propagation, 11(4), pp. 548-556. doi: 10.1049/iet-map.2015.0712
The authors present the design of a tunable 433 MHz antenna that is tailored for wearable wireless sensor applications. This study first presents a detailed analysis of the measured impedance characteristics of a chosen antenna under test (AUT) in varying proximity to a human test subject. Instead of limiting the analysis to the head and hand only, this analysis measures the AUT impedance at varying distances from 11 different body positions. A novel antenna equivalent circuit model is then developed that enables both the free-space and total on-body AUT impedance variation to be rapidly computed using a circuit simulator instead of the requirement for computationally intensive finite-element methods for example. The design and characterisation of a tunable matching network that enables AUT impedance matching for 11 different positions on the human body is then outlined. Finally, a fully-autonomous 433 MHz tunable antenna is demonstrated. The antenna occupies a small printed circuit board area of 51 × 28 mm and is printed on standard FR-4 material with the tuner completely integrated into the antenna itself. Prototype measurements show an improvement of 3.9 dB in power delivery to the antenna for a load voltage standing wave ratio of 17:1, with a maximum matching loss of 0.84 dB and S 11 (−10 dB) ≥ 18 MHz for all load conditions.
Kumar, Sanjeev; Buckley, John L.; Barton, John; Newberry, Robert; Dunlop, Gary; Rodencal, Matthew; Webster, Carlo; Pigeon, Melusine; Scanlon, William G.; O'Flynn, Brendan(Institute of Electrical and Electronics Engineers (IEEE), 2020-03)
A compact 915 MHz antenna integrated within a wristwatch wireless sensor device is presented. The antenna is a variant of a planar inverted-F antenna (PIFA) and uses a dual-resonator configuration. The results of simulation ...
Bahrami, Sirous; Moloudian, Ghollamhosein; Song, Ho-Jin; Buckley, John L.(IEEE, 2022-03-28)
In this paper, a tunable circularly polarized antenna with a reconfigurable integrated feed network is proposed for cognitive radio applications. The integrated feed network is composed of an ultra-wideband (UWB) band-pass ...
Kumar, Sanjeev; Buckley, John; Di Serio, Adolfo; O'Flynn, Brendan(Institute of Electrical and Electronics Engineers (IEEE), 2018-12-24)
Antennas are a critical component of an internet of things device and are typically modelled using full-wave electromagnetic (EM) solvers for their optimal design. In this paper, we investigate and compare the impact, ...
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