Abstract
This paper presents two designs of square-ring slot antennas to suppress the 2nd and 3rd harmonics by involving a frequency-selective surface (FSS) with square-loop-type and meandered-dipole-type elements. The transparency of the surface in the higher-order mode makes the ground plane invalid, so that the harmonics cannot resonate and emit. The experimental results show that the FSS structure not only demonstrates band-reject characteristics, but also well retains the antenna performances for fundamental-mode operation. Moreover, with the square-loop-type lattice, the impedance bandwidth was increased by about four times as much as that of the reference antenna. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 47–49, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21256
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