JPS54161247A - Elastic surface-wave filter - Google Patents

Elastic surface-wave filter

Info

Publication number
JPS54161247A
JPS54161247A JP6988078A JP6988078A JPS54161247A JP S54161247 A JPS54161247 A JP S54161247A JP 6988078 A JP6988078 A JP 6988078A JP 6988078 A JP6988078 A JP 6988078A JP S54161247 A JPS54161247 A JP S54161247A
Authority
JP
Japan
Prior art keywords
transducer
transducers
filter
wave
difference
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
JP6988078A
Other languages
Japanese (ja)
Inventor
Noboru Wakatsuki
Yoshiaki Fujiwara
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP6988078A priority Critical patent/JPS54161247A/en
Publication of JPS54161247A publication Critical patent/JPS54161247A/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 devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6489—Compensation of undesirable effects

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

PURPOSE:To make it possible to set the trap width large without increasing the size of a filter by providing an auxiliary transducer onto a piezoelectric substrate and by connecting it to either main transducer. CONSTITUTION:On piezoelectric substrate 16, wave-transmitting transducer 17 and wave-receiving transducer 18 are both provided and near transducer 18, auxiliary transducer 19 with a relatively-broad band, namely, fewer couples of electrodes is provided. Then, the propagation distance between transducers 17 and 19 is set different with that between 17 and 18. In addition, transducers 18 and 19 are connected in series. The apparent response characteristics of transducer 19 depends chiefly upon a difference in transmission characteristics of transducer 17 to 18, and connecting transducers 18 and 19 together equalizes the IF filter response characteristics of TV to the sum or difference between characteristics of transducers 18 and 19. Therefore, an IF filter can be obtained which is large in trap width and small in size.
JP6988078A 1978-06-12 1978-06-12 Elastic surface-wave filter Pending JPS54161247A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6988078A JPS54161247A (en) 1978-06-12 1978-06-12 Elastic surface-wave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6988078A JPS54161247A (en) 1978-06-12 1978-06-12 Elastic surface-wave filter

Publications (1)

Publication Number Publication Date
JPS54161247A true JPS54161247A (en) 1979-12-20

Family

ID=13415519

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6988078A Pending JPS54161247A (en) 1978-06-12 1978-06-12 Elastic surface-wave filter

Country Status (1)

Country Link
JP (1) JPS54161247A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6005326A (en) * 1996-10-14 1999-12-21 Nec Corporation Surface acoustic wave device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6005326A (en) * 1996-10-14 1999-12-21 Nec Corporation Surface acoustic wave device
US6040651A (en) * 1996-10-14 2000-03-21 Nec Corporation Surface acoustic wave device

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