Title :
Design of broadband semi-lumped and lumped element quadrature hybrids
Author :
Yamasaki, Jun ; Ohta, Isao ; Kawai, Tadashi ; Kokubo, Yoshihiro
Abstract :
Band-broadening techniques for semi-lumped and lumped element quadrature 3 dB hybrids are described. A semi-lumped hybrid is spiral-inductor-free, and the occupied area is about 1/150 compared with a distributed-element one at 1 GHz band. In lumped-element version, two kinds of matching networks are dealt with; one consists of an admittance inverter and a parallel tuned circuit, and the other makes good use of a series one. The former is marked by lower inductance values and the latter by less devise count and wider bandwidth. The fractional bandwidths of the designed hybrids are 20-27% for return loss better than 20 dB and amplitude balance tolerance 0.18 dB.
Keywords :
UHF couplers; coupled transmission lines; directional couplers; equivalent circuits; lumped parameter networks; microwave integrated circuits; 1 GHz; admittance inverter; band-broadening techniques; broadband lumped element quadrature hybrid; broadband semi-lumped element quadrature hybrid; directional couplers; lumped element microwave circuits; matching networks; microwave integrated circuits; parallel tuned circuit; passive circuits; Admittance; Bandwidth; Couplers; Frequency; Inductance; Inverters; Microwave devices; Microwave integrated circuits; Power transmission lines; RLC circuits;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1516903
