Title :
Effects of Klopfenstein tapered feedlines on the frequency- and time-domain performance of planar monopole UWB antennas
Author :
Ruvio, G. ; Ammann, M.J.
Author_Institution :
Antennas & High Freq. Res. Group, Centre for Telecommun. Value-chain Res., Dublin
Abstract :
The effects of a Klopfenstein tapered transmission line used to feed a typical planar monopole UWB antenna have been investigated in terms of impedance bandwidth, phase linearity and radiation properties. The analysis shows that the taper allows manipulation of the resonances occurring within the operating bandwidth. A Klopfenstein tapered feedline that matches the 50 Omega input impedance to 30 Omega along 50 mm is able to reduce the maximum group delay variation by 85% with an acceptable variation of the impedance bandwidth and minor changes in the radiation pattern.
Keywords :
antenna radiation patterns; frequency-domain analysis; monopole antennas; planar antennas; time-domain analysis; ultra wideband antennas; Klopfenstein tapered feedlines; frequency-domain performance; impedance bandwidth; phase linearity; planar monopole UWB antennas; radiation pattern; time-domain performance; Antenna feeds; Bandwidth; Frequency; Impedance; Linearity; Planar transmission lines; Resonance; Time domain analysis; Transmission line antennas; Ultra wideband antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2008. AP-S 2008. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2041-4
Electronic_ISBN :
978-1-4244-2042-1
DOI :
10.1109/APS.2008.4619876
