Search

Abstract: A resonator based metamaterial for sensor application is studied in this paper. The resonator is encompassed by a partial ground plane and excited by a microstrip feed‐line. As the resonator, partial ground frame, and the feeding transmission line are on the same microstrip, the measurement can be executed by using the common laboratory facility instead of using the waveguide. The proposed metamaterial occupies a compact size of 20 × 20 mm2 and is imprinted on a low‐cost FR4 substrate. The substrate has a relative permittivity of 4.6 with a dielectric loss tangent of 0.02. The resonator and the ground frame are placed on the similar part of the substrate and the feed‐line is placed on the other part of the substrate. In metamaterial design, normally arrays of metamaterial unit cells are needed, whereas this study presents only one cell, which can achieve the metamaterial properties. The characteristic parameters are fetched and analyzed to find the concurrency between the simulated and measured results. The presented metamaterial is applied in sensor applications where the simulated and measured results reveal considerable agreement. [ABSTRACT FROM AUTHOR]

This article presents a compact microstrip meander-line antenna for sensor network applications in the 290 MHz band. The antenna is fed by coplanar waveguide and its dimension is 15 mm × 15 mm × 2 mm. Because of the use of a very high relative permittivity substrate (ℇr = 90) and meander-line structure simultaneously, the side length of the designed antenna is about λg/12 (λg is the guided wavelength) so that the circuit size is reduced greatly. Measurements verify that the proposed antenna has bandwidth of 12% at the resonant frequency of 293 MHz. Also, the radiation patterns measured at resonance frequencies are very close to omnidirectional in the E-plane. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2438–2440, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22798 [ABSTRACT FROM AUTHOR]