Title :
Microwave filter application of inductively coupled superconducting striplines
Author :
Yoshida, K. ; Kudo, K. ; Hossain, M.S. ; Watanabe, K. ; Enpuku, K. ; Yamafuji, K.
Author_Institution :
Dept. of Electron., Kyushu Univ., Fukuoka, Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
A design theory is presented to apply inductively coupled superconducting striplines to microwave filters, in which the coupled stripline system is considered as four-port circuitry. By obtaining eigenvalues for impedance, admittance, and scattering matrices, the authors obtained general formulas for designing bandpass filters. The microwave filters using this coupling scheme are simple in design and have advantages of external-modulation capability. Experiments to demonstrate the validity of this coupling scheme have been performed in the frequency range between DC and 300 GHz by investigating the coupling between a Josephson oscillator and an external stripline.<>
Keywords :
S-matrix theory; band-pass filters; distributed parameter networks; equivalent circuits; linear network synthesis; microwave filters; passive filters; strip line components; superconducting microwave devices; 0 to 300 GHz; admittance; bandpass filters; coupled stripline system; design theory; eigenvalues; external-modulation capability; four-port circuitry; impedance; inductively coupled superconducting striplines; microwave filters; scattering matrices; Band pass filters; Coupling circuits; Eigenvalues and eigenfunctions; Filtering theory; Microwave circuits; Microwave filters; Microwave theory and techniques; Stripline; Superconducting filters; Superconducting microwave devices;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
