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JPS55127719A - Ladder-type ceramic filter - Google Patents

Ladder-type ceramic filter

Info

Publication number
JPS55127719A
JPS55127719A JP3503679A JP3503679A JPS55127719A JP S55127719 A JPS55127719 A JP S55127719A JP 3503679 A JP3503679 A JP 3503679A JP 3503679 A JP3503679 A JP 3503679A JP S55127719 A JPS55127719 A JP S55127719A
Authority
JP
Japan
Prior art keywords
resonators
spuriousness
vibration
ladder
peripheral
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.)
Pending
Application number
JP3503679A
Other languages
Japanese (ja)
Inventor
Bunshiro Tsuda
Tetsuo Yoshida
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.)
Tokin Corp
Original Assignee
Tohoku Metal 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 Tohoku Metal Industries Ltd filed Critical Tohoku Metal Industries Ltd
Priority to JP3503679A priority Critical patent/JPS55127719A/en
Publication of JPS55127719A publication Critical patent/JPS55127719A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/58—Multiple crystal filters
    • H03H9/60—Electric coupling means therefor
    • H03H9/605—Electric coupling means therefor consisting of a ladder configuration

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

PURPOSE:To improve a spuriousness by using vibrators, which utilize length vibration and peripheral vibration respectively, as the series resonator and the parallel resonator of a ladder-type ceramic filter. CONSTITUTION:Plural series resonators 1 and parallel resonators 2 are combined to constitute a ladder-type ceramic filter, and vibrators which are easy to produce and may have a large dimension tolerance of resonators and utilize square peripheral vibration are used as parallel resonators, and piezo-electric vibrators which utilize length vibration of rectangular plates are used as series resonators. Peculiar spuriousness is generated near a frequency as about 1.4 times as high as the main resonance frequency in peripheral vibrarion of the square plate; however, since spuriousness (a) generated in the main resonance frequency of the rectangular plate is considerably different from that of the square plate, the spuriousness is improved considerably in comparison with spuriousness (b) of the filter, which utilizes peripheral vibration of the square plate conventionally, by combining both resonators.
JP3503679A 1979-03-27 1979-03-27 Ladder-type ceramic filter Pending JPS55127719A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3503679A JPS55127719A (en) 1979-03-27 1979-03-27 Ladder-type ceramic filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3503679A JPS55127719A (en) 1979-03-27 1979-03-27 Ladder-type ceramic filter

Publications (1)

Publication Number Publication Date
JPS55127719A true JPS55127719A (en) 1980-10-02

Family

ID=12430819

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3503679A Pending JPS55127719A (en) 1979-03-27 1979-03-27 Ladder-type ceramic filter

Country Status (1)

Country Link
JP (1) JPS55127719A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7126253B2 (en) * 2001-07-18 2006-10-24 Epcos Ag Reactance filter having an improved edge steepness

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7126253B2 (en) * 2001-07-18 2006-10-24 Epcos Ag Reactance filter having an improved edge steepness

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