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A bow-tie antenna with asymmetrical and overlapped arms printed on the top and bottom of a dielectric substrate is proposed and tested. By adjusting the asymmetry and overlapping of the two arms, return loss below −10 dB, quasi-omnidirectional radiation characteristics, reasonable gain values and beam tilt can be achieved at GSM/CDMA and 3G/WLAN bands.
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Wang et al. (2007) studied this question.
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