Lumped-Element Balun for UHF UWB Printed Balanced Antennas

A semi-lumped balun transformer for UHF and ultrawideband (UWB) dipole antennas is presented in this paper. The proposed structure is based on two asymmetric filters that also transform the variable antenna impedance into the desired source impedance. These asymmetric filters make use of a binomial...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2008-07, Vol.56 (7), p.2102-2107
Main Authors: Gonzalez-Posadas, V., Martin-Pascual, C., Jimenez-Martin, J.L., Segovia-Vargas, D.
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Asymmetry
Balancing
Baluns
Band pass filters
Bandwidth
Binomials
Dipole antennas
Exact sciences and technology
Impedance
Impedance matching
Low pass filters
Matched filters
Microwave frequencies
Radiocommunications
Telecommunications
Telecommunications and information theory
Transformers
UHF
UHF antennas
Ultra wideband antennas
Ultra wideband technology
ultrawideband (UWB) antennas
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A semi-lumped balun transformer for UHF and ultrawideband (UWB) dipole antennas is presented in this paper. The proposed structure is based on two asymmetric filters that also transform the variable antenna impedance into the desired source impedance. These asymmetric filters make use of a binomial impedance transformer in each filter section. The asymmetric filters (one low pass filter, LPF, and other high pass filter, HPF) allow the balun bandwidth to be increased while the binomial transformer matches the variable balanced dipole impedance. In this way the ripple in the balun response due to the variation of the UWB dipole impedance is reduced. A balun for a UHF and UWB dipole antenna working from 220 to 820 MHz (bandwidth of 4:1) has been achieved with losses lower than 1 dB. These types of baluns are particularly useful in the low microwave frequency band.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2008.924769