Title:
METHOD AND APPARATUS FOR ACHIEVING BROADBAND MATCHING OF NARROW-BAND RESONATOR FILTER IMPEDANCES TO LOADS AND SOURCES
Document Type and Number:
WIPO Patent Application WO2001091292
Kind Code:
A3
Abstract:
A circuit for matching the impedance of a narrow-band resonator filter presented to a port over a broad range of frequencies employs a second resonator that has substantially the same transfer characteristic as the resonator filter. The resonator filter is isolated from the output port using a resonator having a dual characteristic that behaves as a short circuit in the pass-band of the resonator filter, and is an open circuit in the stop-band of the resonator filter. The second resonator is isolated from the port using a resistor that has a value on the order of the ideal or desired impedance to be presented at the port. The circuit provides an impedance at the port that is approximately equal to the desired impedance in the stop-band, and an impedance that is slightly degraded in the pass-band, and particularly at the on-frequency of the resonator filter. The circuit is particularly useful when narrow band-pass resonator filters are employed in broadband multichannel systems coupled to the input ports of an impedance sensitive load, such as a passive mixers used to perform frequency conversion over a wide range of frequencies.
Inventors:
PETROVIC BRANISLAV A
Application Number:
PCT/US2001/017236
Publication Date:
June 06, 2002
Filing Date:
May 24, 2001
Export Citation:
Assignee:
BROADBAND INNOVATIONS INC (US)
International Classes:
H03H7/38; H04B1/26; (IPC1-7): H03H7/38
Foreign References:
| GB2337381A | 1999-11-17 |
Other References:
VON W KRAUTKRAMER AND A RICHTSCHEID: "RESONANZTRANSFORMATOREN MIT DREI REAKTANZEN ALS TRANSFORMIERENDE FILTER", BULL. DES SCHWEIZERISCHEN ELEKTROTECHNIK VEREINS, vol. 64, no. 23, 10 November 1973 (1973-11-10), pages 1500 - 1509, XP002184530
ENG CHUAN LOW ET AL: "A PLASTIC PACKAGE GAAS MESFET 5.8-GHZ RECEIVER FRONT-END WITH ON-CHIP MATCHING FOR ETC SYSTEM", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE INC. NEW YORK, US, vol. 48, no. 2, February 2000 (2000-02-01), pages 209 - 213, XP000906161, ISSN: 0018-9480
ENG CHUAN LOW ET AL: "A PLASTIC PACKAGE GAAS MESFET 5.8-GHZ RECEIVER FRONT-END WITH ON-CHIP MATCHING FOR ETC SYSTEM", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE INC. NEW YORK, US, vol. 48, no. 2, February 2000 (2000-02-01), pages 209 - 213, XP000906161, ISSN: 0018-9480
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