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JPS5516569A - Piezoelectric filter - Google Patents

Piezoelectric filter

Info

Publication number
JPS5516569A
JPS5516569A JP8955678A JP8955678A JPS5516569A JP S5516569 A JPS5516569 A JP S5516569A JP 8955678 A JP8955678 A JP 8955678A JP 8955678 A JP8955678 A JP 8955678A JP S5516569 A JPS5516569 A JP S5516569A
Authority
JP
Japan
Prior art keywords
conductive film
propagation
comb
piezoelectric substrate
wave surge
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
JP8955678A
Other languages
Japanese (ja)
Other versions
JPS6243363B2 (en
Inventor
Takeshi Inoue
Tomeji Ono
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8955678A priority Critical patent/JPS5516569A/en
Publication of JPS5516569A publication Critical patent/JPS5516569A/en
Publication of JPS6243363B2 publication Critical patent/JPS6243363B2/ja
Granted 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
    • H03H9/56—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 suppress the propagation of an elastic wave surge, to remove unneeded vibrations, and to improve resuring attenuation cut-off characteristics of a stopping band, by forming a comb-shaped conductive film with several branches at the middle part of a filter element. CONSTITUTION:On piezoelectric substrate 31, double mode filters 32 and 33 and electrode 34 as a coupling capacity are formed and comb-shaped conductive film 35 is provided at its center. The reflection of a propagation wave surge reaching from the input side direct to the output side, caused by a difference in impedance between the exposed part of the piezoelectric substrate and the part where the conductive film is formed and the potential of the conductive film part are even over the entire surface, so that the propagation of the surface can electrically be stopped.
JP8955678A 1978-07-21 1978-07-21 Piezoelectric filter Granted JPS5516569A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8955678A JPS5516569A (en) 1978-07-21 1978-07-21 Piezoelectric filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8955678A JPS5516569A (en) 1978-07-21 1978-07-21 Piezoelectric filter

Publications (2)

Publication Number Publication Date
JPS5516569A true JPS5516569A (en) 1980-02-05
JPS6243363B2 JPS6243363B2 (en) 1987-09-14

Family

ID=13974086

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8955678A Granted JPS5516569A (en) 1978-07-21 1978-07-21 Piezoelectric filter

Country Status (1)

Country Link
JP (1) JPS5516569A (en)

Also Published As

Publication number Publication date
JPS6243363B2 (en) 1987-09-14

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