Title :
Optimization of a lumped element circulator based on eigen inductance evaluation and structural improvement
Author :
Miura, T. ; Kobayashi, M. ; Nagata, H. ; Konishi, Y.
Author_Institution :
Mater. Res. Center, TDK Corp., Chiba, Japan
Abstract :
An optimization technique for a lumped element circulators has been established from the point of view of structure and characteristic design. Structural optimization was achieved by the application of multilayer ceramic technology and a novel conductor formation method to decrease the insertion loss of the circulator. A theoretical design based on an evaluation of eigen inductance made it possible to broaden the isolation bandwidth of a structurally improved circulator. The 20 dB isolation bandwidth of 5.8% and the insertion loss of 0.55 dB at 800 MHz obtained by this circulator have significantly exceeded the characteristics of conventional circulators of the same size.
Keywords :
circulators; eigenvalues and eigenfunctions; inductance; lumped parameter networks; optimisation; 0.55 dB; 800 MHz; conductor formation; design; eigen inductance; insertion loss; isolation bandwidth; lumped element circulator; multilayer ceramic technology; structural optimization; Bandwidth; Ceramics; Conductors; Coupling circuits; Design optimization; Equivalent circuits; Inductance; Insertion loss; Resonance; Resonant frequency;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.508476
