Title :
New classes of miniaturized planar Marchand baluns
Author :
Fathelbab, Wael M. ; Steer, Michael B.
Author_Institution :
Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA
fDate :
4/1/2005 12:00:00 AM
Abstract :
Three new classes of miniaturized Marchand balun are defined based on the synthesis of filter prototypes. They are suitable for mixed lumped-distributed planar realizations with small size resulting from transmission-line resonators being a quarter-wavelength long at frequencies higher than the passband center frequency. Each class corresponds to an S-plane bandpass prototype derived from the specification of transmission zero locations. A tunable 50:100-Ω balun is realized at 1 GHz to demonstrate the advantages of the approach presented here.
Keywords :
baluns; band-pass filters; high-pass filters; network synthesis; poles and zeros; resonator filters; 1 GHz; bandpass filters; filter prototypes; high-pass filter; miniaturized planar Marchand baluns; network synthesis; transmission line resonators; transmission zero; Band pass filters; Circuit synthesis; Coupling circuits; Filtering theory; Frequency; Impedance matching; Network synthesis; Passband; Prototypes; Transmission lines; High-pass/bandpass prototypes; Marchand balun; network synthesis; transmission zeros;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.845707
