GB1474605A - Surface acoustic wave devices - Google Patents

Surface acoustic wave devices

Info

Publication number
GB1474605A
GB1474605A GB2114874A GB2114874A GB1474605A GB 1474605 A GB1474605 A GB 1474605A GB 2114874 A GB2114874 A GB 2114874A GB 2114874 A GB2114874 A GB 2114874A GB 1474605 A GB1474605 A GB 1474605A
Authority
GB
United Kingdom
Prior art keywords
gratings
waves
reflected
output
surface wave
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
GB2114874A
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB2114874A priority Critical patent/GB1474605A/en
Publication of GB1474605A publication Critical patent/GB1474605A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/36—Devices for manipulating acoustic surface waves
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H03H9/42—Time-delay networks using surface acoustic waves
    • H03H9/44—Frequency dependent delay lines, e.g. dispersive delay lines
    • 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
    • H03H9/6423—Means for obtaining a particular transfer characteristic
    • H03H9/643—Means for obtaining a particular transfer characteristic the transfer characteristic being determined by reflective or coupling array characteristics
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/04—Shaping pulses by increasing duration; by decreasing duration
    • H03K5/06—Shaping pulses by increasing duration; by decreasing duration by the use of delay lines or other analogue delay elements
    • H03K5/065—Shaping pulses by increasing duration; by decreasing duration by the use of delay lines or other analogue delay elements using dispersive delay lines

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

1474605 Surface wave devices DEFENCE SECRETARY OF STATE FOR 14 May 1975 [13 May 1974] 21148/74 Heading H3U In a surface wave device, waves from input transducer means 2 travelling along tracks 3 and 4 are respectively reflected by gratings 5, 6 towards further gratings 9, 10 which reflect the waves to output transducer means 13, 14, metal layers 15, 16 of varying width being provided between the gratings in each track so as to vary the velocity of waves passing beneath them and thus to determine the impulse response of the device. The grating elements 7, 8 are strip conductors or equal depth grooves and, as shown, their spacing varies along the length of the gratings so that the device gives a swept frequency output. The shapes of layers 15, 16 are complementary, in that they would form a trapezium if combined, and the indent and narrowest parts of layer 15 introduce phase changer of # and #/2 respectively so that waves reflected at the ends of the gratings cancel at the combined output 17 and waves reflected at the centres are in phase. Alternatively elements 7, 8 may be equallyspaced, in which case the metal layers would combine to form a rectangle. In the modification of Fig. 4 (not shown) tracks 3, 4 lie on opposite sides of input transducer 2 and a single output transducer is used. In an alternative arrangement two input transducers may be used.
GB2114874A 1975-05-14 1975-05-14 Surface acoustic wave devices Expired GB1474605A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2114874A GB1474605A (en) 1975-05-14 1975-05-14 Surface acoustic wave devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2114874A GB1474605A (en) 1975-05-14 1975-05-14 Surface acoustic wave devices

Publications (1)

Publication Number Publication Date
GB1474605A true GB1474605A (en) 1977-05-25

Family

ID=10158005

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2114874A Expired GB1474605A (en) 1975-05-14 1975-05-14 Surface acoustic wave devices

Country Status (1)

Country Link
GB (1) GB1474605A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403689A1 (en) * 1977-09-20 1979-04-13 Thomson Csf SURFACE ELASTIC WAVE DEVICE FOR TREATMENT OF HIGH FREQUENCY SIGNALS
EP0117081A2 (en) * 1983-01-31 1984-08-29 Nec Corporation Surface acoustic wave dispersive delay lines
EP0163372A2 (en) * 1984-05-31 1985-12-04 Trw Inc. Surface acoustic wave device for data rate reduction
DE3937871A1 (en) * 1989-11-14 1991-05-16 Siemens Ag Reflector filter for acoustic surface waves - has input converter(s) with main wave propagation device and output converter(s) with such device
EP0585863A1 (en) * 1992-09-02 1994-03-09 Mitsubishi Denki Kabushiki Kaisha Surface acoustic wave device
CN105242244A (en) * 2015-08-31 2016-01-13 北京中讯四方科技股份有限公司 Low-time-bandwidth-product and low-time-sidelobe surface acoustic wave compression line

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403689A1 (en) * 1977-09-20 1979-04-13 Thomson Csf SURFACE ELASTIC WAVE DEVICE FOR TREATMENT OF HIGH FREQUENCY SIGNALS
EP0117081A2 (en) * 1983-01-31 1984-08-29 Nec Corporation Surface acoustic wave dispersive delay lines
EP0117081A3 (en) * 1983-01-31 1986-03-19 Nec Corporation Surface acoustic wave dispersive delay lines
EP0163372A2 (en) * 1984-05-31 1985-12-04 Trw Inc. Surface acoustic wave device for data rate reduction
EP0163372A3 (en) * 1984-05-31 1988-10-05 Trw Inc. Surface acoustic wave device for data rate reduction
DE3937871A1 (en) * 1989-11-14 1991-05-16 Siemens Ag Reflector filter for acoustic surface waves - has input converter(s) with main wave propagation device and output converter(s) with such device
EP0585863A1 (en) * 1992-09-02 1994-03-09 Mitsubishi Denki Kabushiki Kaisha Surface acoustic wave device
US5396199A (en) * 1992-09-02 1995-03-07 Mitsubishi Denki Kabushiki Kaisha Surface acoustic wave device
CN105242244A (en) * 2015-08-31 2016-01-13 北京中讯四方科技股份有限公司 Low-time-bandwidth-product and low-time-sidelobe surface acoustic wave compression line
CN105242244B (en) * 2015-08-31 2018-03-06 北京中讯四方科技股份有限公司 A kind of small time-bandwidth product and low time sidelobe surface acoustic wave compressed lines

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee