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Printed Monopole Antenna with Tunable Band-Notched Characteristic for Use in Mobile and Ultra-Wide Band Applications

Elfergani, I. ; Hussaini , A. ; See, C ; Abd-Alhameed, R.A. Abd-Alhameed ; McEwan, N.J ; Zhu, s ; Rodriguez, J. ; Clarke, R. W.

Intrnl. Journal of RF and Microwave Computer-Aided Engineering Vol. 25, Nº 5, pp. 403 - 412, June, 2015.

ISSN (print): 1096-4290
ISSN (online): 1096-4290

Journal Impact Factor: 0,475 (in 2010)

Digital Object Identifier: 10.1002/mmce.20874

A tunable band-notch printed monopole antenna is presented, exhibiting a
wide impedance bandwidth from 1.5 to 5.5 GHz with good impedance matching
(VSWR2) and a tunable rejected frequency band from 2.38 to 3.87 GHz. The bandnotching
is achieved by adding an inner chorded crescent element within a driven element
of a similar shape. By varying the value of the varactor, which is placed between the inner
and outer arcs, the desired variable rejected can be obtained. Simulated and measured
results show wide impedance bandwidth with a tunable band notch, stable radiation patterns,
and consistent nearly constant gain. The antenna is suitable for mobile and portable