JPS5624821A - Piezoelectric filter - Google Patents

Piezoelectric filter

Info

Publication number
JPS5624821A
JPS5624821A JP10098579A JP10098579A JPS5624821A JP S5624821 A JPS5624821 A JP S5624821A JP 10098579 A JP10098579 A JP 10098579A JP 10098579 A JP10098579 A JP 10098579A JP S5624821 A JPS5624821 A JP S5624821A
Authority
JP
Japan
Prior art keywords
mode resonator
electrode
series arm
frequency
terminal
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.)
Granted
Application number
JP10098579A
Other languages
Japanese (ja)
Other versions
JPS6040213B2 (en
Inventor
Kimio Seike
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.)
NOTO DENSHI KOGYO KK
Original Assignee
NOTO DENSHI KOGYO KK
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 NOTO DENSHI KOGYO KK filed Critical NOTO DENSHI KOGYO KK
Priority to JP10098579A priority Critical patent/JPS6040213B2/en
Priority to US06/113,449 priority patent/US4287493A/en
Publication of JPS5624821A publication Critical patent/JPS5624821A/en
Publication of JPS6040213B2 publication Critical patent/JPS6040213B2/en
Expired 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 devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/56—Monolithic crystal filters
    • H03H9/566—Electric coupling means therefor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/56—Monolithic crystal filters

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 the symmetry of attenuation characteristics by improving the attenuation degree of a high-frequency side by decreasing the antiresonance frequency of the series arm of a ladder type filter by connecting a capacitor between the input terminal and output terminal of the series arm. CONSTITUTION:On piezoelectric substrate 1, at least one couple of multiple-mode resonator 2 and single-mode resonator 3 are formed and used as the series arm and parallel arm of a ladder type filter respectively. Then, capacitor C is connected between terminal electrode 5 connecting with split electrode 2a at the input side of the multiple-mode resonator and terminal electrode 7 connecting with split electrode 2b at the output side of multiple-mode resonator 2 by way of one electrode of single- mode resonator 3. Therefore, the antiresonance frequency of the series arm forming a high-frequency side pole decreases, and consequently the attenuation degree of the high-frequency side improve, improving the symmetry of attenuation characteristics.
JP10098579A 1979-01-25 1979-08-07 piezoelectric filter Expired JPS6040213B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP10098579A JPS6040213B2 (en) 1979-08-07 1979-08-07 piezoelectric filter
US06/113,449 US4287493A (en) 1979-01-25 1980-01-21 Piezoelectric filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10098579A JPS6040213B2 (en) 1979-08-07 1979-08-07 piezoelectric filter

Publications (2)

Publication Number Publication Date
JPS5624821A true JPS5624821A (en) 1981-03-10
JPS6040213B2 JPS6040213B2 (en) 1985-09-10

Family

ID=14288608

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10098579A Expired JPS6040213B2 (en) 1979-01-25 1979-08-07 piezoelectric filter

Country Status (1)

Country Link
JP (1) JPS6040213B2 (en)

Also Published As

Publication number Publication date
JPS6040213B2 (en) 1985-09-10

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