Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1998-10-21
2000-04-18
Lee, Benny
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333219, 333238, H01P 1203, H01P 308, H01P 708
Patent
active
060520434
ABSTRACT:
A thin-film multilayered electrode has a dielectric substrate; a ground conductor provided on a back surface of the dielectric substrate; and a plurality of thin-film conductive layers and dielectric layers alternately stacked on a front surface of the dielectric substrate. In one example, the ground conductor, one of the thin-film conductive layers in contact with the dielectric substrate and the dielectric substrate interposed therebetween form a TEM mode principal transmission line, and each thin-film dielectric layer and a pair of thin-film conductive layers sandwiching the thin-film dielectric layer form a TEM mode sub-transmission line. A thickness and a dielectric constant of each thin-film dielectric layer is set such that phase velocities of TEM waves which propagate through the TEM mode principal transmission line and the TEM mode sub-transmission lines are substantially identical with each other. A thickness of each thin-film conductive layer is set at a predetermined value which is smaller than a skin depth at a predetermined operating frequency such that electromagnetic fields between the TEM mode principal transmission line and its adjacent TEM mode sub-transmission line, and between each adjacent pair of TEM mode sub-transmission lines, are coupled with each other. At least one of the thin-film dielectric layers which is closest to the dielectric substrate has a thickness greater than that of the other thin-film dielectric layers.
REFERENCES:
patent: 2879183 (1959-03-01), Doherty et al.
patent: 5770988 (1998-06-01), Goto et al.
patent: 5920243 (1999-07-01), Ishikawa et al.
patent: 5920244 (1999-07-01), Kobayashi et al.
Patenet Abstracts of Japan, vol. 16, No. 539 (E-1289), Nov. 10, 1992 & JP 04 206607 A (Hitachi Maxell Ltd), Jul. 28, 1992, abstract.
Patent Abstracts of Japan, vol. 98, No. 4, Mar. 31, 1998 & JP 09 326608 A (Murata Mfg Co Ltd), Dec. 16, 1997, abstract.
European Search Report dated Jan. 29, 1999.
Gotoh Yoshihiko
Kobayashi Masato
Tanaka Katsuhiko
Lee Benny
Murata Manufacturing Co. Ltd.
Summons Barbara
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