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Bandwidth and Impedance-Matching Enhancement of Fractal Monopole Antennas Using Compact Grounded Coplanar Waveguide

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3 Author(s)
Naghshvarian Jahromi, M. ; Electr. Eng. Dept., Iran of Univ. Sci. & Technol., Tehran, Iran ; Falahati, A. ; Edwards, R.M.

Grounded coplanar waveguides (GCPW) are used to enhance antenna characteristics, namely, reference to the VSWR <; 2 bandwidth and the input impedance dynamic range. A printed fractal monopole such as the Sierpinski-Carpet (SC) antenna can be considered as a good candidate for comparing a coaxial-fed system with a GCPW-fed antenna. Conventional SC can be applied at 6.25-8.4 GHz (ref to VSWR <; 2 ), while modified SC matches throughout the 4.65-10.5 GHz (ref to VSWR <; 2 ). Clearly, this new feeding technique changes the behavior of the fractal elements from multiband to wideband. The GCPW-fed antennas have a low crosspolar field and a well-behaved pattern over the enhanced ones. This system of antennas is a possible competitor for the FCC ultrawideband radio short, fat pipe systems. In addition, time-domain analyses are performed to realize the proposed antenna time-domain application over ultrawideband.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 7 )