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Compact planar quasi-Yagi antenna with band-notched characteristic for WLAN and DSRC for ultra-wideband applications

Compact planar quasi-Yagi antenna with band-notched characteristic for WLAN and DSRC for ultra-wideband applications

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A compact planar quasi-Yagi antenna with a wideband microstrip-to-slotline transition and a modified bow-tie driver is designed with an enhanced bandwidth for precise indoor positioning applications. A compact interdigital capacitor loaded loop resonator with a high quality factor is placed inside the ring resonator at the end of the antenna's slot to realise band-notched characteristics over a frequency range of 5.1–6.3 GHz, thus avoiding interference from wireless local area networks (WLANs) and dedicated short-range communications (DSRCs). Measured results show that the proposed antenna obtains a relative impedance bandwidth, determined by the voltage standing wave ratio <2, higher than 122.6% (3.0–12.5 GHz) and a gain of 4.9–7.8 dBi outside of the stop band.

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