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A novel stacked folded shorted patch antenna for dual-band operation is presented. It has impedance bandwidths (SWR<2) of 22.9 and 20.3% in the lower and the upper bands, respectively. It is 0.046λL in height and 0.27λL in length, where λL is the free space wavelength at the centre frequency of the lower band. Therefore, it is very suitable for today's multi-band wireless communication systems.
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Lau et al. (2007) studied this question.
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