GB1363918A - Crystal filters - Google Patents

Crystal filters

Info

Publication number
GB1363918A
GB1363918A GB3677071A GB3677071A GB1363918A GB 1363918 A GB1363918 A GB 1363918A GB 3677071 A GB3677071 A GB 3677071A GB 3677071 A GB3677071 A GB 3677071A GB 1363918 A GB1363918 A GB 1363918A
Authority
GB
United Kingdom
Prior art keywords
input
resonators
intermediate resonators
grounded
aug
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.)
Expired
Application number
GB3677071A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB1363918A publication Critical patent/GB1363918A/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

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

1363918 Filters WESTERN ELECTRIC CO Inc 5 Aug 1971 [12 Aug 1970] 36770/71 Heading H3U A crystal filter comprises, mounted on a piezo-electric wafer, input, and output, resonators 1, 8 operating in a thickness shear mode, between which are situated short circuited intermediate resonators some of which are connected to an input terminal of the filter, the remainder being grounded, or "floating". The change of attenuation on the skirts of the passband is thus increased. As shown, there are six intermediate resonators of which one, two or three may be connected together and to the input, the remainder being grounded, Figs. 2, 3; Figs. 4-7 (not shown), or two interconnected resonators are connected to the input, with two more "floating", Fig. 8. Frequency-attenuation curves are given, Figs. 2A-9A (not shown), and the effect of the intermediate resonators on such curves can be determined experimentally Figs. 10, 10A, 11, 11A (not shown), and understood in terms of a primary wave produced by the input resonator, interacting with a secondary wave produced by the short circuited intermediate resonators connected to an input terminal. The filter exhibits energy trapping consequent upon mass loading by the electrodes.
GB3677071A 1970-08-12 1971-08-05 Crystal filters Expired GB1363918A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6320470A 1970-08-12 1970-08-12

Publications (1)

Publication Number Publication Date
GB1363918A true GB1363918A (en) 1974-08-21

Family

ID=22047661

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3677071A Expired GB1363918A (en) 1970-08-12 1971-08-05 Crystal filters

Country Status (10)

Country Link
US (1) US3656180A (en)
JP (1) JPS5116093B1 (en)
BE (1) BE771051A (en)
CA (1) CA925967A (en)
DE (1) DE2139218C3 (en)
ES (1) ES394607A1 (en)
FR (1) FR2104192A5 (en)
GB (1) GB1363918A (en)
NL (1) NL162523C (en)
SE (1) SE361800B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739304A (en) * 1971-09-27 1973-06-12 Bell Telephone Labor Inc Resonator interconnections in monolithic crystal filters
JPS5329265B2 (en) * 1972-09-20 1978-08-19
US3947784A (en) * 1974-09-19 1976-03-30 Motorola, Inc. Dual-coupled monolithic crystal element for modifying response of filter
US3944951A (en) * 1974-11-21 1976-03-16 Bell Telephone Laboratories, Incorporated Monolithic crystal filter
US4484158A (en) * 1982-07-07 1984-11-20 General Electric Company Monolithic crystal filter and method of manufacturing same
US4604543A (en) * 1984-11-29 1986-08-05 Hitachi, Ltd. Multi-element ultrasonic transducer
GB0014963D0 (en) * 2000-06-20 2000-08-09 Koninkl Philips Electronics Nv A bulk acoustic wave device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198684A (en) * 1938-09-20 1940-04-30 Bell Telephone Labor Inc Wave filter
US2373431A (en) * 1943-03-30 1945-04-10 Bell Telephone Labor Inc Electric wave filter
US3185943A (en) * 1956-04-23 1965-05-25 Toyotsushinki Kabushiki Kaisha One-piece mechanical filter having portions forming plural resonators and coupling means
US3222622A (en) * 1962-08-14 1965-12-07 Clevite Corp Wave filter comprising piezoelectric wafer electroded to define a plurality of resonant regions independently operable without significant electro-mechanical interaction
FR1430874A (en) * 1963-12-12 1966-03-11 Commissariat Energie Atomique Magnetic resonance magnetometer
US3334307A (en) * 1966-11-14 1967-08-01 Zenith Radio Corp Multi-electrode acoustic amplifier with unitary transducing and translating medium

Also Published As

Publication number Publication date
DE2139218C3 (en) 1974-12-19
SE361800B (en) 1973-11-12
CA925967A (en) 1973-05-08
AU3202771A (en) 1973-02-08
DE2139218B2 (en) 1974-05-09
NL7111061A (en) 1972-02-15
DE2139218A1 (en) 1972-02-17
US3656180A (en) 1972-04-11
JPS5116093B1 (en) 1976-05-21
FR2104192A5 (en) 1972-04-14
BE771051A (en) 1971-12-16
ES394607A1 (en) 1975-04-01
NL162523B (en) 1979-12-17
NL162523C (en) 1980-05-16

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee