Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1994-08-23
1998-02-17
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333219, H01P 1203
Patent
active
057195390
ABSTRACT:
A dielectric antenna duplexer used in a high frequency radio device such as a portable telephone, and a dielectric filter for forming the duplexer of the SIR (stepped impedance resonator) composed by cascade connection of first transmission lines having one end grounded and second transmission lines having one end open and lower in characteristic impedance than in the first transmission lines, first transmission lines and second transmission lines are individually coupled in electromagnetic field, thereby forming an antenna duplexer and a dielectric filter of small insertion loss, high bandwidth selectivity, excellent band pass characteristic, and low cost.
REFERENCES:
patent: 4431977 (1984-02-01), Sokola et al.
patent: 4506241 (1985-03-01), Makimoto et al.
patent: 4701727 (1987-10-01), Wong
patent: 4742562 (1988-05-01), Kommrusch
patent: 5124676 (1992-06-01), Ueno
patent: 5144268 (1992-09-01), Weidman
patent: 5248949 (1993-09-01), Eguchi
patent: 5349314 (1994-09-01), Shimizu et al.
patent: 5373271 (1994-12-01), Hirai et al.
patent: 5416454 (1995-05-01), McVeety
patent: 5448209 (1995-09-01), Hirai et al.
G. Mattaei; "Comb-Line Band-Pass Filters of Narrow or Moderate Bandwidth", pp. 82-91 (Aug., 1963).
J.D. Rhodes; "The Stepped Digital Elliptic Filter", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-17, No. 4, pp. 178-184 (Apr. 1969).
R. Pregla; "Microwave Filters of Coupled Lines and Lumped Capacitances", IEEE Transactions on Microwave Theory and Techniques, pp. 278-280, (May 1970).
M. Makimoto et al; "Compact Bandpass Filters Using Stepped Impedance Resonators", Proceedings of the IEEe, vol. 67, No. 1, pp. 16-19, (Jan. 1979).
T. Ishizaki et al; "A Very Small Dielectric Planar Filter For Portable Telephones" 1993 IEEE MTT-S Digest, pp. 177-180.
H. Kagata et al; "Low-Fire Microwave Dielectric Ceramics and Multilayer Devices With Silver Internal Electrode", Ceramic Transactions, vol. 32, 1993, pp. 81-90.
Partial European Search Report dated Dec. 7, 1995.
Curtis, J.A. et al., "Multi-Layered Planar Filters Based on Aperture Coupled, Dual Mode Microstrip or Stripline Resonators," IEEE MTT-S Int'l Microw. Symposium-Digest, vol. 3, 1992, Albuquerque, pp. 1203-1206.
Ishizaki, T. et al., "A Very Small Dielectric Planar Filter for Portable Telephones," IEEE MTT-S Int'l Microw. Symposium--Digest, vol. 1, 1993, Atlanta, pp. 177-180.
Kagata, H. et al., "Low-Fire Bismuth-Based Dielectric Ceramics for Microwave Use," Japanese Journal of Applied Physics, vol. 31, No. 9b, Sep. 1992, Tokyo, pp. 3152-3155.
Lo, Wen-Teng et al., "KBand Quasi-Planar Tapped Combline Filter and Diplexer," IEEE Transactions on Microwave Theory and Techniques, vol. 41, No. 2, Feb. 1993, New York, pp. 215-223.
Nishikawa, T., "RF Front End Circuit Components Miniaturized Using . . . ," Transactions of the Institute of Electronics, Information and Communication Engineers of Japan, vol. E74, No. 6, 1991, Tokyo, pp. 1556-1562.
Partial European Search Report dated Jan. 30, 1996.
Aizawa Kimio
Fujino Takashi
Ishizaki Toshio
Kushitani Hiroshi
Nakakubo Hideaki
Matsushita Electric - Industrial Co., Ltd.
Pascal Robert
Vu David
LandOfFree
Dielectric filter with multiple resonators does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dielectric filter with multiple resonators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dielectric filter with multiple resonators will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1787175