Enhancement of Parameters of Slotted Waveguide Antennas Using Metamaterials
关键词:
antenna measurement, antenna modeling, beamwidth, metamaterials, slotted antenna, split-ring resonator摘要
An approach to increasing the gain of a slotarray antenna through the use of metamaterials is presented. The specific array antenna used in this study is a 2x4 resonant, slotted-waveguide array, although the results presented should be applicable to most arrays with slot radiators. To achieve increased gain, a metamaterial structure comprised of a split-ring resonator in conjunction with a wire structure was placed above the radiating slots. Modeled results for this configuration predicted an increase in directivity of 49%, and this result was subsequently validated by fabricating and performing measurements on antenna arrays incorporating the metamaterials. The increase in directivity also resulted in increased efficiency and sidelobe depth and yet did not degrade return loss. The measured results show that the maximum gain enhancement of antennas with metamaterials increased by up to 58% with respect to the control antenna which did not employ metamaterials.
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