GB544775A - Improvements in and relating to band filters - Google Patents

Improvements in and relating to band filters

Info

Publication number
GB544775A
GB544775A GB15560/40A GB1556040A GB544775A GB 544775 A GB544775 A GB 544775A GB 15560/40 A GB15560/40 A GB 15560/40A GB 1556040 A GB1556040 A GB 1556040A GB 544775 A GB544775 A GB 544775A
Authority
GB
United Kingdom
Prior art keywords
circuit
coupling
coupled
band
relating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB15560/40A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri AG Switzerland, BBC Brown Boveri France SA filed Critical BBC Brown Boveri AG Switzerland
Publication of GB544775A publication Critical patent/GB544775A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H03H7/0169—Intermediate frequency filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/06—Frequency selective two-port networks including resistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1708—Comprising bridging elements, i.e. elements in a series path without own reference to ground and spanning branching nodes of another series path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1775—Parallel LC in shunt or branch path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/09—Filters comprising mutual inductance

Abstract

544,775. Band-pass filters. AKT.-GES. BROWN, BOVERI, & CIE. Oct. 22, 1940, No. 15560. Convention date, Sept. 11, 1939. [Class 40 (iii)] A filter comprises a pair of tightly coupled tuned circuits such as l<SP>1</SP>, C1, and l<SP>2</SP>, C<SP>2</SP> loosely coupled to a third tuned circuit l<SP>3</SP>, C3, the damping of which is adjustable as by a shunt resistance W3 or a series resistance, to vary the band width. The shape of the attenuation curve can be adjusted by varying the tuning of the third circuit and the value of the coupling condenser C4. The latter may be fixed and associated with the third circuit by means of a potentiometer or may be replaced by a resistive coupling in the form of a bridged T-network. In a further modification, the coil l<SP>s</SP> is coupled to both coils l<SP>1</SP>, l<SP>2</SP>. The coupling l<SP>1</SP>, C<SP>1</SP> and l<SP>2</SP>, C2 may be capacitive or galvanic.
GB15560/40A 1939-09-11 1940-10-22 Improvements in and relating to band filters Expired GB544775A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH544775X 1939-09-11

Publications (1)

Publication Number Publication Date
GB544775A true GB544775A (en) 1942-04-27

Family

ID=4519282

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15560/40A Expired GB544775A (en) 1939-09-11 1940-10-22 Improvements in and relating to band filters

Country Status (1)

Country Link
GB (1) GB544775A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10575395B2 (en) 2016-06-07 2020-02-25 Honeywell International Inc. Band pass filter-based galvanic isolator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10575395B2 (en) 2016-06-07 2020-02-25 Honeywell International Inc. Band pass filter-based galvanic isolator

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