A dual-ISM-band antenna of small size using a spiral structure with parasitic element

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A dual-ISM-band antenna of small size using a spiral structure with parasitic element

Buckley, John; McCarthy, Kevin G.; Loizou, Loizos; O'Flynn, Brendan; O'Mathuna, Cian
Date: 2015-08-06
Copyright: © 2015, IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Related: https://ieeexplore.ieee.org/abstract/document/7181661
Citation: Buckley, J. L., McCarthy, K. G., Loizou, L., O'Flynn, B. and O'Mathuna, C. (2016) 'A dual-ISM-band antenna of small size using a spiral structure with parasitic element', IEEE Antennas and Wireless Propagation Letters, 15, pp. 630-633. doi: 10.1109/LAWP.2015.2465831
Published Version: 10.1109/LAWP.2015.2465831

Abstract:

This letter presents a compact, single-feed, dual-band antenna covering both the 433-MHz and 2.45-GHz Industrial Scientific and Medical (ISM) bands. The antenna has small dimensions of 51 ×28 mm². A square-spiral resonant element is printed on the top layer for the 433-MHz band. The remaining space within the spiral is used to introduce an additional parasitic monopole element on the bottom layer that is resonant at 2.45 GHz. Measured results show that the antenna has a 10-dB return-loss bandwidth of 2 MHz at 433 MHz and 132 MHz at 2.45 GHz, respectively. The antenna has omnidirectional radiation characteristics with a peak realized gain (measured) of -11.5 dBi at 433 MHz and +0.5 dBi at 2.45 GHz, respectively.

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