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A shorting-wall loaded metamaterial mushroom array antenna is proposed for bandwidth enhancement and compact design. Owing to the shorting-wall loading, the lower frequency region of the right-handed branch of the composite right/left-handed (CRLH) mushroom structure is exploited. The operating modes of the antenna are investigated. The antenna prototype at 5-GHz band exhibits 26% impedance bandwidth...
A type of metamaterial-based center-fed mushroom antenna is proposed for low-profile broadband antenna design. The mushroom structure is used as the radiating element and aperture coupled beneath the radiators. Unique dual resonant modes are simultaneously excited for broadside radiation. The proposed antenna design methodology has been successfully applied in antenna and array designs for 5-GHz WLAN...
The response of a wideband beamformer based on a rectangular array with spatial-only information is studied. In this beamformer, each of the received array signals is only processed by one single coefficient and its output is an instantaneous weighted combination of the received signals. One interesting property of it is that it has a totally different beam response depending on whether we are considering...
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