GB1508714A - Tunable band-stop filter with variable attenuation - Google Patents

Tunable band-stop filter with variable attenuation

Info

Publication number
GB1508714A
GB1508714A GB1316776A GB1316776A GB1508714A GB 1508714 A GB1508714 A GB 1508714A GB 1316776 A GB1316776 A GB 1316776A GB 1316776 A GB1316776 A GB 1316776A GB 1508714 A GB1508714 A GB 1508714A
Authority
GB
United Kingdom
Prior art keywords
inductor
inductors
coupling
circuit
shaft
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
GB1316776A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1508714A publication Critical patent/GB1508714A/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
    • 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

Landscapes

  • Filters And Equalizers (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

1508714 Tunable band-stop filters PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 1 April 1976 [4 April 1975] 13167/76 Heading H3U [Also in Division H1] To avoid variation of the suppressed frequency when the amount of suppression is adjusted in a band-stop filter circuit, Fig. 1, a coupling inductor 7 and a compensation inductor 19 are movable simultaneously relative to a tuned-circuit inductor 15 by a drive mechanism 43, 41, Fig. 4, so that an increase in the coupling between inductors 15 and 7 is accompanied by a decrease in the coupling between inductors 15 and 19, and vice versa. As shown in Fig. 1, inductor 7 has a centre tapping 11 connected to a shunt arm impedance 13, e.g. parallel-connected capacitor 45 and resistor 47, Fig. 4, and compensation inductor 19 is shortcircuited. The filter is tuned by a variable capacitor 17 in series with inductor 15. The drive mechanism comprises a rotary shaft 43 carrying an eccentric disc 41 which engages both inductor 19, which is constituted by a resilient wire, and an adjusting screw 39 for inductor 7, which is constituted by a spring-biased metal strip, so that upon rotation of shaft 43 one of the inductors 7, 19 approaches inductor 15 while the other is moved further away. An alternative arrangement in which inductors 7, 19 are fixed and inductor 15 is movable is also envisaged. A fine adjustment of the frequency of the tuning-circuit may be effected by rotation of a metal plate 53 on a shaft 55 to vary the inductance of inductor 15.
GB1316776A 1975-04-04 1976-04-01 Tunable band-stop filter with variable attenuation Expired GB1508714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7504004A NL176728C (en) 1975-04-04 1975-04-04 ADJUSTABLE BELT FILTER WITH ADJUSTABLE SUPPRESSION.

Publications (1)

Publication Number Publication Date
GB1508714A true GB1508714A (en) 1978-04-26

Family

ID=19823512

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1316776A Expired GB1508714A (en) 1975-04-04 1976-04-01 Tunable band-stop filter with variable attenuation

Country Status (7)

Country Link
JP (1) JPS51123039A (en)
DE (1) DE2613990C2 (en)
ES (1) ES446630A1 (en)
FR (1) FR2306572A1 (en)
GB (1) GB1508714A (en)
IT (1) IT1057827B (en)
NL (1) NL176728C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446188A (en) * 2007-02-01 2008-08-06 Blackstar Amplification Ltd Variable middle- or centre-dip frequency for an audio equalizer/amplifier

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2682837B1 (en) * 1991-10-17 1994-01-07 Electricite De France DIRECTIVE SEPARATOR-COUPLER CIRCUIT FOR MEDIUM FREQUENCY CARRIER CURRENTS ON LOW VOLTAGE ELECTRIC LINE.
KR102233949B1 (en) * 2018-11-16 2021-03-31 주식회사 루트로닉 Energy transfer module for a vagina wall treatment device, control method of a vagina wall treatment device comprising that

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932435A (en) * 1931-12-15 1933-10-31 Bell Telephone Labor Inc Transmission network
GB390926A (en) * 1932-02-16 1933-04-20 Carl Fichlander Improvements in electrical coupling arrangements for thermionic valve amplifiers
NL39540C (en) * 1933-01-30
DE691813C (en) * 1936-11-24 1940-06-06 Bernd Meininghaus Resonance curve
US2187340A (en) * 1937-07-24 1940-01-16 Telefunken Gmbh Means adapted to regulate the band width
FR857456A (en) * 1938-08-12 1940-09-14 Schaub Appbau Gmbh Wavelength Bandwidth Radio Regulator
DE938388C (en) * 1943-03-10 1956-01-26 Siemens Ag High-frequency band filter made up of three coupled circuits with bandwidth changes due to mutual displacement of the coupling coils
NL65491C (en) * 1943-08-09 1900-01-01
US2694150A (en) * 1951-06-29 1954-11-09 Avco Mfg Corp Combined very-high-frequency and ultra-high-frequency tuner for television receivers
FR2075595A5 (en) * 1970-01-19 1971-10-08 Cselt Centro Studi Lab Telecom
DE2148038C3 (en) * 1971-09-25 1978-12-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Notch filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446188A (en) * 2007-02-01 2008-08-06 Blackstar Amplification Ltd Variable middle- or centre-dip frequency for an audio equalizer/amplifier
GB2446188B (en) * 2007-02-01 2011-07-27 Blackstar Amplification Ltd Audio amplifier

Also Published As

Publication number Publication date
FR2306572B1 (en) 1982-05-07
DE2613990A1 (en) 1976-10-14
NL176728B (en) 1984-12-17
JPS566722B2 (en) 1981-02-13
ES446630A1 (en) 1977-06-16
FR2306572A1 (en) 1976-10-29
NL176728C (en) 1985-05-17
DE2613990C2 (en) 1983-06-01
NL7504004A (en) 1976-10-06
IT1057827B (en) 1982-03-30
JPS51123039A (en) 1976-10-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee