JPS55107319A - Surface acoustic wave filter - Google Patents

Surface acoustic wave filter

Info

Publication number
JPS55107319A
JPS55107319A JP1481979A JP1481979A JPS55107319A JP S55107319 A JPS55107319 A JP S55107319A JP 1481979 A JP1481979 A JP 1481979A JP 1481979 A JP1481979 A JP 1481979A JP S55107319 A JPS55107319 A JP S55107319A
Authority
JP
Japan
Prior art keywords
trd
oscillation
zero
sources
surface acoustic
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
JP1481979A
Other languages
Japanese (ja)
Other versions
JPS6219088B2 (en
Inventor
Michio Kadota
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.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing 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 Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP1481979A priority Critical patent/JPS55107319A/en
Publication of JPS55107319A publication Critical patent/JPS55107319A/en
Publication of JPS6219088B2 publication Critical patent/JPS6219088B2/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
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6489—Compensation of undesirable effects
    • H03H9/6493—Side lobe suppression
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/1455—Transducers of particular shape or position constituted of N parallel or series transducers

Landscapes

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

Abstract

PURPOSE:To increase the attenuation of side lobe, by separating the normal type transducer TRD into two via the zero oscillation source and coupling the oscillation groups of two or more TRD separated via the zero oscillation sources two pieces in succession. CONSTITUTION:The normal type inter-digital TRD electrode 20 are separated into the parts 21, 22 with the zero oscillation source 23, and they are connected in series through the fingers 22a, 22b and the capacitance of overall TRD 20 is reduced to 1/4 in comparison with the capacitance before separation. The part 21 of TRD is constituted with three connected fingers 24a-24c, 25a-25c of the same potential and includes the oscillation source groups 24, 25 in which two sets of zero oscillation sources are continued, and the oscillation source groups 26-28 having a suitable number of plus and minus oscillation sources are provided by clipping them. Similarly, the part 22 of TRD is provided with the plus and minus oscillation sources 31-33 by clipping the zero oscillation sources 29-30 two sets in succession. Thus, the attenuation of side lobe adjacent to the passing band is increased and the surface acoustic filter having TRD of high impedance suitable for hermetic package can be obtained.
JP1481979A 1979-02-09 1979-02-09 Surface acoustic wave filter Granted JPS55107319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1481979A JPS55107319A (en) 1979-02-09 1979-02-09 Surface acoustic wave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1481979A JPS55107319A (en) 1979-02-09 1979-02-09 Surface acoustic wave filter

Publications (2)

Publication Number Publication Date
JPS55107319A true JPS55107319A (en) 1980-08-18
JPS6219088B2 JPS6219088B2 (en) 1987-04-27

Family

ID=11871642

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1481979A Granted JPS55107319A (en) 1979-02-09 1979-02-09 Surface acoustic wave filter

Country Status (1)

Country Link
JP (1) JPS55107319A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5585770A (en) * 1993-06-30 1996-12-17 Motorola, Inc. Three terminal surface acoustic wave (SAW) device
US5990762A (en) * 1996-05-23 1999-11-23 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and multistage filter with multiple inside busbar lead-out electrodes
US6348845B2 (en) 1996-05-23 2002-02-19 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and multistage surface acoustic wave filter
US6801100B2 (en) 1996-05-23 2004-10-05 Matsushita Electric Industrial Co., Ltd. Inter-digital transducer, surface acoustic wave filter and communication apparatus using the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5585770A (en) * 1993-06-30 1996-12-17 Motorola, Inc. Three terminal surface acoustic wave (SAW) device
US5990762A (en) * 1996-05-23 1999-11-23 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and multistage filter with multiple inside busbar lead-out electrodes
EP0921636A3 (en) * 1996-05-23 2000-05-17 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and multistage surface acoustic wave filter
US6348845B2 (en) 1996-05-23 2002-02-19 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and multistage surface acoustic wave filter
US6351196B1 (en) 1996-05-23 2002-02-26 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and multistage surface acoustic wave filter
US6801100B2 (en) 1996-05-23 2004-10-05 Matsushita Electric Industrial Co., Ltd. Inter-digital transducer, surface acoustic wave filter and communication apparatus using the same

Also Published As

Publication number Publication date
JPS6219088B2 (en) 1987-04-27

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