GB2233520B - Frequency filtering apparatus - Google Patents

Frequency filtering apparatus

Info

Publication number
GB2233520B
GB2233520B GB8927813A GB8927813A GB2233520B GB 2233520 B GB2233520 B GB 2233520B GB 8927813 A GB8927813 A GB 8927813A GB 8927813 A GB8927813 A GB 8927813A GB 2233520 B GB2233520 B GB 2233520B
Authority
GB
United Kingdom
Prior art keywords
filtering apparatus
frequency filtering
frequency
filtering
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 - Lifetime
Application number
GB8927813A
Other versions
GB2233520A (en
GB8927813D0 (en
Inventor
David Eric Waller
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.)
BAE Systems PLC
Original Assignee
British Aerospace PLC
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 British Aerospace PLC filed Critical British Aerospace PLC
Publication of GB8927813D0 publication Critical patent/GB8927813D0/en
Publication of GB2233520A publication Critical patent/GB2233520A/en
Application granted granted Critical
Publication of GB2233520B publication Critical patent/GB2233520B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Radio Relay Systems (AREA)
GB8927813A 1988-12-19 1989-12-08 Frequency filtering apparatus Expired - Lifetime GB2233520B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB888828681A GB8828681D0 (en) 1988-12-19 1988-12-19 Frequency filtering apparatus

Publications (3)

Publication Number Publication Date
GB8927813D0 GB8927813D0 (en) 1990-02-14
GB2233520A GB2233520A (en) 1991-01-09
GB2233520B true GB2233520B (en) 1992-05-27

Family

ID=10648183

Family Applications (2)

Application Number Title Priority Date Filing Date
GB888828681A Pending GB8828681D0 (en) 1988-12-19 1988-12-19 Frequency filtering apparatus
GB8927813A Expired - Lifetime GB2233520B (en) 1988-12-19 1989-12-08 Frequency filtering apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB888828681A Pending GB8828681D0 (en) 1988-12-19 1988-12-19 Frequency filtering apparatus

Country Status (1)

Country Link
GB (2) GB8828681D0 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5613197A (en) * 1994-11-03 1997-03-18 Hughes Aircraft Co. Multi-channel transponder with channel amplification at a common lower frequency
JP2803723B2 (en) * 1996-09-02 1998-09-24 日本電気株式会社 Frequency conversion filter
US5790959A (en) * 1996-11-13 1998-08-04 Hewlett-Packard Company Programmable band select and transfer module for local multipoint distribution service basestation
US6115363A (en) * 1997-02-19 2000-09-05 Nortel Networks Corporation Transceiver bandwidth extension using double mixing
US6088569A (en) * 1998-04-23 2000-07-11 Motorola, Inc. Method and apparatus for receiving a plurality of signals having different frequency bandwidths

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB578512A (en) * 1941-11-12 1946-07-02 Gen Electric Co Ltd Improvements in electrical filters
GB583246A (en) * 1944-07-14 1946-12-12 Standard Telephones Cables Ltd Improvements in or relating to electrical arrangements for selecting individual components of a complex wave
GB847243A (en) * 1955-12-30 1960-09-07 Beckman Instruments Inc Improvements in or relating to frequency selective circuit arrangements

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB578512A (en) * 1941-11-12 1946-07-02 Gen Electric Co Ltd Improvements in electrical filters
GB583246A (en) * 1944-07-14 1946-12-12 Standard Telephones Cables Ltd Improvements in or relating to electrical arrangements for selecting individual components of a complex wave
GB847243A (en) * 1955-12-30 1960-09-07 Beckman Instruments Inc Improvements in or relating to frequency selective circuit arrangements

Also Published As

Publication number Publication date
GB2233520A (en) 1991-01-09
GB8828681D0 (en) 1989-05-17
GB8927813D0 (en) 1990-02-14

Similar Documents

Publication Publication Date Title
GB8803826D0 (en) Filter apparatus
IL83329A (en) Filter apparatus
EP0390600A3 (en) Filter apparatuses
EP0253620A3 (en) Filter apparatus
PL286127A1 (en) Filtering apparatus
GB8828949D0 (en) Filtering apparatus
IL88940A0 (en) Filter apparatus
IL88939A0 (en) Filter apparatus
GB2198364B (en) Filter apparatus
GB2233520B (en) Frequency filtering apparatus
GB8727025D0 (en) Filter apparatus
ZA906018B (en) Straining apparatus
GB2234188B (en) Filtration apparatus
GB2185696B (en) Filter apparatus
GB8808363D0 (en) Straining apparatus
GB8900921D0 (en) Filtration apparatus
IL81469A0 (en) Filter apparatus
ZA895901B (en) Filter apparatus
GB2203668B (en) Filtering apparatus
IL78150A0 (en) Filter apparatus
IL87309A (en) Filter apparatus
IL87308A0 (en) Filter apparatus
IL87304A0 (en) Filter apparatus
IL90902A0 (en) Filter apparatus
IL90286A0 (en) Filter apparatus

Legal Events

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

Effective date: 19941208

732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)