A Y-shaped proximity coupled V-slot microstrip patch antenna (MPA) is presented in this letter. Separating the patch from the Y-shaped stub by a foam layer with height of 0.05lambda0(lambda0is the free-space wavelength at the center frequency), the proposed MPA shows an impedance bandwidth (BW) of 21%, simple structure and a high gain of about 9 dBi, which is not sensitive to the fabrication and construction errors
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Qu et al. (2007) studied this question.
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