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International Journal of Antennas and Propagation
Volume 2014, Article ID 802815, 8 pages
http://dx.doi.org/10.1155/2014/802815
Research Article

Miniaturized Antenna Solution Based on Lossy Planar Microresonators to Conjointly Control Radiation and Selectivity

1School of Electronics and Information Engineering, South China University of Technology, 381 Road Wushan, Guangzhou 510640, China
2LUNAM University, University of Nantes, IETR CNRS 6164, Polytech Nantes, La Chantrerie, rue Christian Pauc, BP 50609, 44306 Nantes, France

Received 14 March 2014; Revised 1 September 2014; Accepted 1 September 2014; Published 13 October 2014

Academic Editor: Matteo Pastorino

Copyright © 2014 Biyun Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We propose a new method to design miniaturized compact antennas, in which it is possible to control conjointly the radiation efficiency and the bandwidth selectivity of the antenna. And this method has been validated by the realization of prototypes based on planar resonators. The geometry of these resonators has been chosen because their unloaded quality factor can be controlled and is mainly dependent on radiation loss. In the first time, a filter with a significant potential to radiation has been realized by choosing suitable miniaturized resonators. An antenna, based on the same structure, in which the output of the filter was removed (load by air resistance) can be obtained. Modification of the quality factor of each resonator is necessary to take into account the change of the load value from the previous filter to the final structure. The position and the quality factor of the resonators are determined by a filter design concept to obtain a specific frequency response in which each resonator is a basic radiation element. Load of the antenna is ultimately a distributed load constituted by the parallel contributions of each resonators to radiation loss. In other words such an antenna can also be called radiating filter.