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PIER Letters  2012 

Tunable Filtenna Using Varactor Tuned Rings FED with an Ultra Wideband Antenna

DOI: 10.2528/PIERL11111810

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Abstract:

A tunable filtering antenna (filtenna) realized using rings fed with an ultra-wideband (UWB) planar, elliptical monopole antenna is proposed. An array of slotted rings with varactors is placed in close proximity of the planar monopole to obtain the low profile tunable filtenna. The array of rings can be viewed as a small tunable frequency selective surface. The design produces a tuning range of about 3.8-4.4 GHz over a varactor reverse bias voltage of 1-4 V.

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