A frequency reconfigurable antenna based on metamaterial is presented. It is composed of a coplanar-fed straight-line monopole with two double split-ring resonators (DSRRs) of different size disposed at its proximity. Each cell exhibits a negative permeability over a frequency band, which produces magnetic couplings with the monopole that starts to radiate at new bands; the whole structure is now a tri-band antenna. The frequencies over which the two DSRRs exhibit a negative permeability have been arbitrarily chosen to show that the proposed approach can be used to create new operating bands and also to introduce notches. By using a single switch at each metamaterial cell, their effect can be deactivated and the corresponding resonance can be suppressed, resulting in a frequency reconfigurable antenna. Simulated and measured results are presented and good agreement is achieved.

This article presents an optimized design for a novel printed monopole antenna, with a notched semi‐elliptical ground plane. A parametric study of the antenna parameters and their effects is given. The monopole antenna with the proposed bandwidth enhancement technique covers the band 3.1–10.6 GHz, which has been approved by the Federal Communications Commission as a commercial band for ultra‐wideband communication systems, with a measured return loss bandwidth of 7.9 GHz (2.9–10.8 GHz). © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 54–58, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24830

Abstract-A compact printed dipole antenna using fractal shape for Radio Frequency IDentification (RFID) is presented. The proposed antenna consists of a third iteration fractal tree structure with the aim of reducing the antenna size. It occupies a volume of 78×30×1.58 mm 3 and the radiator is composed of two arms. The antenna has been designed and optimized to cover the bi-band for passive RFID tag at 915 MHz and 2.4 GHz. A parametric study of the proposed antenna was carried out in order to optimize the main parameters. Details of the proposed antenna design and measurement results are presented and discussed.

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