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JPS5762616A - Filter circuit using surface acoustic wave filter - Google Patents

Filter circuit using surface acoustic wave filter

Info

Publication number
JPS5762616A
JPS5762616A JP55136730A JP13673080A JPS5762616A JP S5762616 A JPS5762616 A JP S5762616A JP 55136730 A JP55136730 A JP 55136730A JP 13673080 A JP13673080 A JP 13673080A JP S5762616 A JPS5762616 A JP S5762616A
Authority
JP
Japan
Prior art keywords
saw
auxiliary
acoustic wave
surface acoustic
main
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
JP55136730A
Other languages
Japanese (ja)
Inventor
Riichi Kodama
Masayoshi Etsuno
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55136730A priority Critical patent/JPS5762616A/en
Publication of JPS5762616A publication Critical patent/JPS5762616A/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
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6406—Filters characterised by a particular frequency characteristic

Landscapes

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

Abstract

PURPOSE:To make a trap deep, by providing the auxiliary surface acoustic wave filter, which has the output of a specific frequency of the same amplitude and the opposite phase and has a different center frequency, in parallel with a main surface acoustic wave filter. CONSTITUTION:A main surface acoustic wave filter (main SAW) consists of converters 2 and 3, and an auxiliary surface acoustic wave filter (auxiliary SAW) consists of converters 4 and 5. The band width of the auxiliary SAW in -3DB is within 30% of that of the main SAW, and their center frequencies are different. Delay quantities of the main SAW and the auxiliary SAW are so that outputs of the main SAW and the auxiliary SAW have the same amplitude and phases opposite to each other in a frequency where a trap is to be obtained. By connecting the main SAW and the auxiliary SAW in parallel, outputs in the trap frequency are canceled by each other and are hardly output. A phase shifter may be provided to obtained delay quantities.
JP55136730A 1980-10-02 1980-10-02 Filter circuit using surface acoustic wave filter Pending JPS5762616A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55136730A JPS5762616A (en) 1980-10-02 1980-10-02 Filter circuit using surface acoustic wave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55136730A JPS5762616A (en) 1980-10-02 1980-10-02 Filter circuit using surface acoustic wave filter

Publications (1)

Publication Number Publication Date
JPS5762616A true JPS5762616A (en) 1982-04-15

Family

ID=15182156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55136730A Pending JPS5762616A (en) 1980-10-02 1980-10-02 Filter circuit using surface acoustic wave filter

Country Status (1)

Country Link
JP (1) JPS5762616A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5661444A (en) * 1994-06-06 1997-08-26 Siemens Aktiengesellschaft Multi-channel, narrow-band saw filter
US5666092A (en) * 1993-05-19 1997-09-09 Nec Corporation Bandpass filter having at least two saw resonator filters coupled in parallel
EP1104952A1 (en) 1999-05-14 2001-06-06 Kabushiki Kaisha Toshiba Surface acoustic wave device
EP1189346A2 (en) * 2000-09-13 2002-03-20 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and communication apparatus with the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5666092A (en) * 1993-05-19 1997-09-09 Nec Corporation Bandpass filter having at least two saw resonator filters coupled in parallel
US5661444A (en) * 1994-06-06 1997-08-26 Siemens Aktiengesellschaft Multi-channel, narrow-band saw filter
EP1104952A1 (en) 1999-05-14 2001-06-06 Kabushiki Kaisha Toshiba Surface acoustic wave device
EP1104952A4 (en) * 1999-05-14 2006-02-22 Toshiba Kk Surface acoustic wave device
EP1189346A2 (en) * 2000-09-13 2002-03-20 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and communication apparatus with the same
EP1189346A3 (en) * 2000-09-13 2005-03-16 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and communication apparatus with the same

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