Title :
Planar ultra-wideband balun using coupled microstrip lines
Author_Institution :
Sch. of ITEE, Univ. of Queensland, St. Lucia, QLD, Australia
Abstract :
A planar balun based on using parallel-coupled microstrip lines is presented. It is designed to transfer the unbalanced microstrip line to a balanced coplanar stripline as needed in many applications such as centre-fed dipole antennas. The balun includes a T-junction of stepped-impedance and tapered microstrip lines and two pairs of stepped-impedance parallel-coupled lines. The designed balun covers the band from 3 to 11 GHz with less than 0.4 dB insertion loss.
Keywords :
antenna feeds; baluns; coplanar waveguides; dipole antennas; microstrip lines; T-junction; balanced coplanar stripline; centre-fed dipole antennas; frequency 3 GHz to 11 GHz; parallel-coupled microstrip lines; planar ultra-wideband balun; stepped-impedance; tapered microstrip lines; unbalanced microstrip line;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2013.0922
