GB2210749B - Method of and apparatus for switching lowpass filter cut off frequencies to enable and disable selective passband operation - Google Patents

Method of and apparatus for switching lowpass filter cut off frequencies to enable and disable selective passband operation

Info

Publication number
GB2210749B
GB2210749B GB8817531A GB8817531A GB2210749B GB 2210749 B GB2210749 B GB 2210749B GB 8817531 A GB8817531 A GB 8817531A GB 8817531 A GB8817531 A GB 8817531A GB 2210749 B GB2210749 B GB 2210749B
Authority
GB
United Kingdom
Prior art keywords
frequencies
switching
enable
lowpass filter
filter cut
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
GB8817531A
Other versions
GB8817531D0 (en
GB2210749A (en
Inventor
Ben H Tongue
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.)
Blonder Tongue Laboratories Inc
Original Assignee
Blonder Tongue Laboratories Inc
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 Blonder Tongue Laboratories Inc filed Critical Blonder Tongue Laboratories Inc
Publication of GB8817531D0 publication Critical patent/GB8817531D0/en
Publication of GB2210749A publication Critical patent/GB2210749A/en
Application granted granted Critical
Publication of GB2210749B publication Critical patent/GB2210749B/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
    • 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
    • H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
    • 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
    • H03H7/1758—Series LC in shunt or branch path
GB8817531A 1987-10-07 1988-07-22 Method of and apparatus for switching lowpass filter cut off frequencies to enable and disable selective passband operation Expired GB2210749B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10624287A 1987-10-07 1987-10-07

Publications (3)

Publication Number Publication Date
GB8817531D0 GB8817531D0 (en) 1988-08-24
GB2210749A GB2210749A (en) 1989-06-14
GB2210749B true GB2210749B (en) 1991-09-11

Family

ID=22310313

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8817531A Expired GB2210749B (en) 1987-10-07 1988-07-22 Method of and apparatus for switching lowpass filter cut off frequencies to enable and disable selective passband operation

Country Status (1)

Country Link
GB (1) GB2210749B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2280808B (en) * 1993-08-07 1997-06-11 Motorola Gmbh A filter and a radio communications device comprising the same
FI95327C (en) * 1994-01-26 1996-01-10 Lk Products Oy Adjustable filter
DE102005050630A1 (en) 2005-10-21 2007-04-26 Rohde & Schwarz Gmbh & Co. Kg Switchable diplexer for microwave applications, has transverse units formed as switching units in highpass filter path and in lowpass filter path, making selective connection to ground

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099040A2 (en) * 1982-07-13 1984-01-25 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Filter with switchable bandwidth

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099040A2 (en) * 1982-07-13 1984-01-25 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Filter with switchable bandwidth

Also Published As

Publication number Publication date
GB8817531D0 (en) 1988-08-24
GB2210749A (en) 1989-06-14

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Legal Events

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

Effective date: 19950722