GB528403A - Improvements in or relating to electrical filter circuits - Google Patents

Improvements in or relating to electrical filter circuits

Info

Publication number
GB528403A
GB528403A GB1352839A GB1352839A GB528403A GB 528403 A GB528403 A GB 528403A GB 1352839 A GB1352839 A GB 1352839A GB 1352839 A GB1352839 A GB 1352839A GB 528403 A GB528403 A GB 528403A
Authority
GB
United Kingdom
Prior art keywords
impedance
capacity
separator
constant
designed
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
GB1352839A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and Co Ltd
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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB1352839A priority Critical patent/GB528403A/en
Publication of GB528403A publication Critical patent/GB528403A/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
    • H03H7/38—Impedance-matching networks
    • 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
    • H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H7/463—Duplexers
    • 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
    • H03H7/175—Series 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
    • H03H7/17—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

Abstract

528,403. Impedance networks. SIEMENS BROS. & CO., Ltd., and REED, M. May 5, 1939, No. 13528. [Class 40 (iii)] In a separator comprising a number of bandpass filters A, B ... N having their input or output terminals connected in parallel, the individual filters are so designed that, over the complete working range of the separator, the impedance as seen from the common terminals is equivalent to a constant resistance shunted by a constant capacity. The insertion of a suitable four-terminal correcting network CN in the common input or output circuit brings the impedance of the whole to a constant resistance. The separator is suitable for selecting different harmonic frequencies produced by a single generator, and each band-pass filter comprises one or more T-sections of the kind shown, or with the series and shunt arms interchanged. In certain cases when the frequencies are high enough, equivalent quartz crystal arrangements may be used. The Specification explains how the filters are designed so that all have the same image impedance in their respective pass ranges and so that the image impedance of each filter outside its pass range is equivalent to a constant capacity. The impedance as seen from the common terminals is then that of a resistance R shunted by a capacity C. The correcting network CN is designed as a band-pass filter (Fig. 1) or as a low-pass filter (Figs. 2, 3) presenting a constant resistance equal to R over the working range, but the shunt capacity CP is made less than the calculated value by the amount C.
GB1352839A 1939-05-05 1939-05-05 Improvements in or relating to electrical filter circuits Expired GB528403A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1352839A GB528403A (en) 1939-05-05 1939-05-05 Improvements in or relating to electrical filter circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1352839A GB528403A (en) 1939-05-05 1939-05-05 Improvements in or relating to electrical filter circuits

Publications (1)

Publication Number Publication Date
GB528403A true GB528403A (en) 1940-10-29

Family

ID=10024610

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1352839A Expired GB528403A (en) 1939-05-05 1939-05-05 Improvements in or relating to electrical filter circuits

Country Status (1)

Country Link
GB (1) GB528403A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1260648B (en) * 1957-05-31 1968-02-08 Siemens Ag Tunable crossover filter arrangement for very short electromagnetic waves
US4851796A (en) * 1987-07-13 1989-07-25 U.S. Philips Corporation TV-RF input circuit
US6734761B2 (en) 2000-08-10 2004-05-11 Infineon Technologies Ag Radio-frequency input stage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1260648B (en) * 1957-05-31 1968-02-08 Siemens Ag Tunable crossover filter arrangement for very short electromagnetic waves
US4851796A (en) * 1987-07-13 1989-07-25 U.S. Philips Corporation TV-RF input circuit
US6734761B2 (en) 2000-08-10 2004-05-11 Infineon Technologies Ag Radio-frequency input stage

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