This paper presents a CPW-fed UWB band-notched antenna having continuously tunable WiMAX rejection band and fixed WLAN rejection band. As the WLAN frequency band is fixed all over the world, it is made fixed with the use of a newly designed resonator in the radiating patch. As the main problem is that the WiMAX band is different in different countries of the world, between 3 and 4 GHz, it is made continuously tunable by using a novel miniaturized implemented resonator in the partial ground plane with variable capacitors. Altering the values of these capacitors tunes the 3-4 GHz rejection band continuously.
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doi:10.1109/LAWP.2012.2234718
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14., "Wideband-to-narrowband tunable monopole antenna with integrated bandpass filters for UWB/WLAN applications," IEEE Antennas and Wireless Propagation Letters, Vol. 16, 2734-2737, 2017.
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doi:10.1109/TAP.2017.2760363
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