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GB493982A - Electric wave filter systems - Google Patents

Electric wave filter systems

Info

Publication number
GB493982A
GB493982A GB30382/37A GB3038237A GB493982A GB 493982 A GB493982 A GB 493982A GB 30382/37 A GB30382/37 A GB 30382/37A GB 3038237 A GB3038237 A GB 3038237A GB 493982 A GB493982 A GB 493982A
Authority
GB
United Kingdom
Prior art keywords
pass
bands
filter
frequencies
attenuation
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
GB30382/37A
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
C Lorenz AG
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 Standard Elektrik Lorenz AG, C Lorenz AG filed Critical Standard Elektrik Lorenz AG
Publication of GB493982A publication Critical patent/GB493982A/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
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1766—Parallel LC in 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
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • 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
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1783—Combined LC in series path

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)
  • Television Systems (AREA)

Abstract

493,982. Multiplex transmission. LORENZ AKT.-GES., C. Nov. 5, 1937, No. 30382. Convention date, Nov. 6, 1936. [Class 40 (iv)] [Also in Group XL] In a separator for filtering the carrier frequencies assigned to three or more transmitters or receivers S1, S2, S3, the cut-off frequencies determined by the attenuation characteristics of a low-pass filter F1, a highpass filter F3, and one or more band-pass filters such as F2, instead of coinciding with the limits of the appropriate side-bands, coincide with the carrier frequencies belonging to adjacent side-bands. Thus the attenuation characteristic of each filter has a wide pass band which overlaps the pass bands of adjacent filters, but undesired frequencies are excluded by the high value of the image impedances, which are arranged to be infinite at the cut-off frequencies. Correctors K1, K3 are added when necessary to ensure the latter result, and the impedances of the filters are matched to the apparatus S1, S2, S3 by networks N1, N2, N3. The arrangement has the advantage that the attenuation in the working pass range of each filter is lower than it would be if the pass bands determined by the attenuation constants were narrowed to coincide with the signal side-bands.
GB30382/37A 1936-11-06 1937-11-05 Electric wave filter systems Expired GB493982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE493982X 1936-11-06

Publications (1)

Publication Number Publication Date
GB493982A true GB493982A (en) 1938-10-18

Family

ID=6544651

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30382/37A Expired GB493982A (en) 1936-11-06 1937-11-05 Electric wave filter systems

Country Status (3)

Country Link
US (1) US2167522A (en)
FR (1) FR828731A (en)
GB (1) GB493982A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1061281B (en) * 1953-04-28 1959-07-16 Erich Kiefer Drying device for parachutes
DE977521C (en) * 1951-10-13 1966-11-03 Siemens Ag Circuit arrangement for reducing the mutual influence of filters connected together on the input or output side

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768351A (en) * 1951-03-13 1956-10-23 Hartford Nat Bank & Trust Co Multipole network
JPH01227530A (en) * 1988-03-07 1989-09-11 Kokusai Electric Co Ltd Branching filter
FR2996385A1 (en) * 2012-09-28 2014-04-04 St Microelectronics Sa PASSIVE FILTER

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977521C (en) * 1951-10-13 1966-11-03 Siemens Ag Circuit arrangement for reducing the mutual influence of filters connected together on the input or output side
DE1061281B (en) * 1953-04-28 1959-07-16 Erich Kiefer Drying device for parachutes

Also Published As

Publication number Publication date
US2167522A (en) 1939-07-25
FR828731A (en) 1938-05-27

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