Title :
Broadband lumped-element 180-degree hybrids utilizing lattice circuits
Author :
Kawai, T. ; Kokubo, Y. ; Ohta, I.
Author_Institution :
Dept. of Electron., Himeji Inst. of Technol., Hyogo, Japan
Abstract :
This paper suggests a novel lumped-element 180/spl deg/ hybrid utilizing lattice circuits. The present hybrid possesses a wide-band property differently from ordinary lumped-element hybrids composed of /spl Pi/ or/and T networks. The bandwidth ratio is 2.4 for a regular type and can be increased to 7.13 by adding a lattice type impedance transformer at each port. The validity and usefulness of this idea also are demonstrated by electromagnetic simulation for a uniplanar circuit pattern.
Keywords :
impedance convertors; lattice networks; lumped parameter networks; waveguide couplers; bandwidth ratio; broadband lumped-element hybrid coupler; electromagnetic simulation; impedance transformer; lattice circuit; uniplanar circuit; Bandwidth; Circuit simulation; Coupling circuits; Distributed parameter circuits; Frequency dependence; Impedance; Lattices; Propagation losses; Transmission line theory; Wideband;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.966836
