Abstract
A novel wideband-to-narrowband tunable monopole antenna with switchable integrated feed network for ultrawideband (UWB)/wireless local area network (WLAN) applications is proposed in this letter. The integrated feed network is composed of a 50 Ω microstrip line, an open-loop bandpass filter, and a three-pole hairpin bandpass filter. The feed network can enable the ultrawideband state, the 2.4 GHz WLAN narrowband state, and 5.8 GHz WLAN narrowband state separately by selecting different RF paths. The RF path selections resulting in frequency reconfiguration are realized by dc controlled p-i-n diodes. The antenna is simulated, fabricated, and measured. Measured tuning ranges and radiation patterns indicate that the proposed reconfigurable filtering antenna is in good performance. The antenna is suitable for multifunctional systems incorporating UWB and WLAN systems.
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