EP0828306A3 - A matched impedance filter - Google Patents

A matched impedance filter Download PDF

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Publication number
EP0828306A3
EP0828306A3 EP97306729A EP97306729A EP0828306A3 EP 0828306 A3 EP0828306 A3 EP 0828306A3 EP 97306729 A EP97306729 A EP 97306729A EP 97306729 A EP97306729 A EP 97306729A EP 0828306 A3 EP0828306 A3 EP 0828306A3
Authority
EP
European Patent Office
Prior art keywords
filter
port
matched impedance
impedance
impedance filter
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.)
Withdrawn
Application number
EP97306729A
Other languages
German (de)
French (fr)
Other versions
EP0828306A2 (en
Inventor
Panu Hagstrom
Seppo Yrjola
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.)
Powerwave Comtek Oy
Original Assignee
LK Products Oy
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
Priority claimed from FI963445A external-priority patent/FI110968B/en
Priority claimed from FI963446A external-priority patent/FI963446A/en
Application filed by LK Products Oy filed Critical LK Products Oy
Publication of EP0828306A2 publication Critical patent/EP0828306A2/en
Publication of EP0828306A3 publication Critical patent/EP0828306A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2136—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using comb or interdigital filters; using cascaded coaxial cavities

Landscapes

  • Transceivers (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

In a radiofrequency filter (34; 35; 36) there is a port (34a; 34b; 34c) by means of which it is connected to an external component (14; 17; 21) and the impedance of which is adjusted by internal filter circuits so as to correspond to the impedance of the external component (Zant, ZRX, ZTX) at the operating frequency. The filter may for example be a duplex filter (34), in which case the internal impedance matching may be employed at the antenna port (34a), at the reception port (34b) and/or at the transmission port (34c).
EP97306729A 1996-09-03 1997-09-02 A matched impedance filter Withdrawn EP0828306A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI963445A FI110968B (en) 1996-09-03 1996-09-03 RF filtering resolution for a radio transmitter
FI963445 1996-09-03
FI963446 1996-09-03
FI963446A FI963446A (en) 1996-09-03 1996-09-03 Impedance-adapted filter

Publications (2)

Publication Number Publication Date
EP0828306A2 EP0828306A2 (en) 1998-03-11
EP0828306A3 true EP0828306A3 (en) 2000-03-22

Family

ID=26160204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97306729A Withdrawn EP0828306A3 (en) 1996-09-03 1997-09-02 A matched impedance filter

Country Status (1)

Country Link
EP (1) EP0828306A3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010020733A1 (en) 2010-05-17 2011-11-17 Albert-Ludwigs-Universität Freiburg Electronic device
US8948707B2 (en) 2013-01-07 2015-02-03 Google Technology Holdings LLC Duplex filter arrangements for use with tunable narrow band antennas having forward and backward compatibility

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0336255A1 (en) * 1988-04-01 1989-10-11 Motorola, Inc. Surface mount filter with integral transmission line connection
US5355524A (en) * 1992-01-21 1994-10-11 Motorola, Inc. Integrated radio receiver/transmitter structure
US5432489A (en) * 1992-03-09 1995-07-11 Lk-Products Oy Filter with strip lines
EP0706230A1 (en) * 1994-10-07 1996-04-10 Lk-Products Oy Radio frequency filter comprising helix resonators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0336255A1 (en) * 1988-04-01 1989-10-11 Motorola, Inc. Surface mount filter with integral transmission line connection
US5355524A (en) * 1992-01-21 1994-10-11 Motorola, Inc. Integrated radio receiver/transmitter structure
US5432489A (en) * 1992-03-09 1995-07-11 Lk-Products Oy Filter with strip lines
EP0706230A1 (en) * 1994-10-07 1996-04-10 Lk-Products Oy Radio frequency filter comprising helix resonators

Also Published As

Publication number Publication date
EP0828306A2 (en) 1998-03-11

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