US5477098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Efficient surface acoustic wave device capable of excitation in plural frequency bands, and signal receiver and communication system utilizing the same
Assignee: Canon Inc
•
Filing: 1994-05-31
•
Granted: 1995-12-19
•
Expires: 2014-05-31
Abstract
Abstract A surface acoustic wave device includes a piezoelectric substrate, a wave guide path provided on the piezoelectric substrate and an interdigital transducer for exciting a surface acoustic wave. The interdigital transducer is provided with plural portions of mutually different pitches of the electrode finger, respectively corresponding to different frequencies. The portions are parallelly arranged along a direction perpendicular to the propagation direction of the surface acoustic wave. The surface acoustic wave generated by the interdigital transducer is entered in concentrated manner into the wave guide path.
Inventors
- 👤 Tadashi Eguchi
- 👤 Akira Torisawa
- 👤 Norihiro Mochizuki
- 👤 Koichi Egara
- 👤 Akihiro Koyama
- 👤 Takahiro Hachisu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:32
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/14547; G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195; H03H9/02535; H03H9/02637; H03H9/02685; H03H9/0274; H03H9/02748; H03H9/02779; H03H9/02787; H03H9/14555; H03H9/14561; H03H9/14564; H03H9/14567; H03H9/46; H03H9/64; H03H9/6406; H03H9/14502; H03H9/14505; H03H9/14508; H03H9/1455; H03H9/14552
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
99 words
A surface acoustic wave device comprising: a piezoelectric substrate; a wave guide path provided on said piezoelectric substrate, for guiding a surface acoustic wave; and an interdigital transducer provided on said piezoelectric substrate, for exciting a surface acoustic wave, said interdigital transducer being provided with plural portions of mutually different pitches of electrode fingers, respectively corresponding to different frequencies, said portions being arranged in parallel manner along a direction perpendicular to the propagating direction of the surface acoustic wave; wherein the surface acoustic wave generated by said interdigital transducer is entered in concentrated manner into said wave guide path.
Claim 2
Dependent Claim
99 words
A surface acoustic wave device comprising: a piezoelectric substrate; a wave guide path provided on said piezoelectric substrate, for guiding a surface acoustic wave; and an interdigital transducer provided on said piezoelectric substrate, for exciting a surface acoustic wave, said interdigital transducer being provided with plural portions of mutually different pitches of electrode fingers, respectively corresponding to different frequencies, said portions being arranged in parallel manner along a direction perpendicular to the propagating direction of the surface acoustic wave; wherein the surface acoustic wave generated by said interdigital transducer is entered in concentrated manner into said wave guide path.
Claim 3
Dependent Claim
35 words
A surface acoustic wave device according to claim 1, wherein means for the concentrated entry is comprised, in said interdigital transducer, of an arc-shaped structure of the electrode fingers, concave to said wave guide path.
Claim 4
Dependent Claim
62 words
A surface acoustic wave device according to claim 2, wherein the length of a portion which connects an overlapping portion of the electrode fingers of the interdigital transducer and a pad portion for electric power supply to the electrode fingers is shortened within an extent that the surface acoustic wave excited by the interdigital transducer does not proceed to said pad portion.
Claim 5
Dependent Claim
28 words
A surface acoustic wave device according to claim 1, wherein means for the concentrated entry comprises a horn provided between said interdigital transducer and said wave guide path.
Claim 6
Dependent Claim
29 words
A surface acoustic wave device according to claim 1, wherein means for the concentrated entry comprises an acoustic lens provided between said interdigital transducer and said wave guide path.
Claim 7
Dependent Claim
36 words
A surface acoustic wave device according to claim 1, wherein said plural portions of different pitches of the electrode fingers of the interdigital transducer are positioned symmetrically with respect to the center of said interdigital transducer.
Claim 8
Dependent Claim
36 words
A surface acoustic wave device according to claim 6, wherein the symmetrical positioning is made in such a manner that the portion with a wider pitch of the electrode fingers is positioned farther from the center.
Claim 9
Dependent Claim
27 words
A surface acoustic wave device according to claim 1, wherein plural portions of different pitches of the electrode fingers of the interdigital transducer are connected in parallel.
Claim 10
Dependent Claim
27 words
A surface acoustic wave device according to claim 1, wherein plural portions of different pitches of the electrode fingers of the interdigital transducer are connected in series.
Claim 11
Dependent Claim
22 words
A surface acoustic wave device according to claim 9, wherein the electrode fingers are shaped in dog-legged manner to achieve serial connection.
Claim 12
Dependent Claim
27 words
A surface acoustic wave device according to claim 1, wherein electrical energy is supplied to the electrode fingers of the interdigital transducer from three or more points.
Claim 13
Dependent Claim
19 words
A surface acoustic wave device according to claim 1, wherein the interdigital transducer is comprised of doubled electrode fingers.
Claim 14
Dependent Claim
19 words
A surface acoustic wave device according to claim 1, where in the interdigital transducer is provided with one-directional property.
Claim 15
Dependent Claim
111 words
A surface acoustic wave device comprising: a piezoelectric substrate; plural interdigital transducers provided on said piezoelectric substrate, for exciting surface acoustic waves, each of said interdigital transducers being provided with plural portions of mutually different pitches of electrode fingers, respectively corresponding to different frequencies, and said portions being arranged in parallel manner in a direction perpendicular to the propagating direction of the surface acoustic waves; and a wave guide path provided on said piezoelectric substrate, for outputting a convolution signal by the surface acoustic waves excited by said plural interdigital transducers; wherein the surface acoustic waves generated by said interdigital transducers are entered in concentrated manner into said wave guide path.
Claim 16
Dependent Claim
111 words
A surface acoustic wave device comprising: a piezoelectric substrate; plural interdigital transducers provided on said piezoelectric substrate, for exciting surface acoustic waves, each of said interdigital transducers being provided with plural portions of mutually different pitches of electrode fingers, respectively corresponding to different frequencies, and said portions being arranged in parallel manner in a direction perpendicular to the propagating direction of the surface acoustic waves; and a wave guide path provided on said piezoelectric substrate, for outputting a convolution signal by the surface acoustic waves excited by said plural interdigital transducers; wherein the surface acoustic waves generated by said interdigital transducers are entered in concentrated manner into said wave guide path.
Claim 17
Dependent Claim
35 words
A surface acoustic wave device according to claim 14, wherein means for the concentrated entry is comprised, in said interdigital transducers, of an arc-shaped structure of the electrode fingers, concave to said wave guide path.
Claim 18
Dependent Claim
62 words
A surface acoustic wave device according to claim 15, wherein the length of a portion which connects an overlapping portion of the electrode fingers of the interdigital transducer and a pad portion for electric power supply to the electrode fingers is shortened within an extent that the surface acoustic wave excited by the interdigital transducer does not proceed to said pad portion.
Claim 19
Dependent Claim
28 words
A surface acoustic wave device according to claim 14, wherein means for the concentrated entry comprises a horn provided between said interdigital transducer and said wave guide path.
Claim 20
Dependent Claim
29 words
A surface acoustic wave device according to claim 14, wherein means for the concentrated entry comprises an acoustic lens provided between said interdigital transducer and said wave guide path.
Claim 21
Dependent Claim
36 words
A surface acoustic wave device according to claim 14, wherein said plural portions of different pitches of the electrode fingers of the interdigital transducer are positioned symmetrically with respect to the center of said interdigital transducer.
Claim 22
Dependent Claim
36 words
A surface acoustic wave device according to claim 19, wherein the symmetrical positioning is made in such a manner that the portion with a wider pitch of the electrode fingers is positioned farther from the center.
Claim 23
Dependent Claim
27 words
A surface acoustic wave device according to claim 14, wherein plural portions of different pitches of the electrode fingers of the interdigital transducer are connected in parallel.
Claim 24
Dependent Claim
27 words
A surface acoustic wave device according to claim 14, wherein plural portions of different pitches of the electrode fingers of the interdigital transducer are connected in series.
Claim 25
Dependent Claim
22 words
A surface acoustic wave device according to claim 22, wherein the electrode fingers are shaped in dog-legged manner to achieve serial connection.
Claim 26
Dependent Claim
27 words
A surface acoustic wave device according to claim 14, wherein electrical energy is supplied to the electrode fingers of the interdigital transducer from three or more points.
Claim 27
Dependent Claim
19 words
A surface acoustic wave device according to claim 14, wherein the interdigital transducer is comprised of doubled electrode fingers.
Claim 28
Dependent Claim
16 words
A surface acoustic wave device according to claim 14, wherein the interdigital transducer has one-directional property.
Claim 29
Dependent Claim
159 words
A signal receiver comprising: a code generator for generating a reference signal; a surface acoustic wave device for outputting a convolution signal of a received signal and the reference signal; and a circuit for demodulating information, using the convolution signal outputted from the surface acoustic wave device; wherein said surface acoustic wave device includes: a piezoelectric substrate; plural interdigital transducers provided on said piezoelectric substrate, for exciting surface acoustic waves, each of said interdigital transducers being provided with plural portions of mutually different pitches of electrode fingers, respectively corresponding to different frequencies, and said portions being arranged in parallel manner in a direction perpendicular to the propagating direction of the surface acoustic waves; and a wave guide path provided on said piezoelectric substrate, for outputting a convolution signal by the surface acoustic waves excited by said plural interdigital transducers; wherein the surface acoustic waves generated by said interdigital transducers are entered in concentrated manner into said wave guide path.
Claim 30
Dependent Claim
159 words
A signal receiver comprising: a code generator for generating a reference signal; a surface acoustic wave device for outputting a convolution signal of a received signal and the reference signal; and a circuit for demodulating information, using the convolution signal outputted from the surface acoustic wave device; wherein said surface acoustic wave device includes: a piezoelectric substrate; plural interdigital transducers provided on said piezoelectric substrate, for exciting surface acoustic waves, each of said interdigital transducers being provided with plural portions of mutually different pitches of electrode fingers, respectively corresponding to different frequencies, and said portions being arranged in parallel manner in a direction perpendicular to the propagating direction of the surface acoustic waves; and a wave guide path provided on said piezoelectric substrate, for outputting a convolution signal by the surface acoustic waves excited by said plural interdigital transducers; wherein the surface acoustic waves generated by said interdigital transducers are entered in concentrated manner into said wave guide path.
Claim 31
Dependent Claim
179 words
A communication system comprising: a transmitter for transmitting a signal modulated according to information; and a receiver including: a code generator for generating a reference signal; a surface acoustic wave device for outputting a convolution signal of a received signal and the reference signal; and a circuit for demodulating information, using the convolution signal outputted from said surface acoustic wave device, said surface acoustic wave device including: a piezoelectric substrate; plural interdigital transducers provided on said piezoelectric substrate, for exciting surface acoustic waves; each of said interdigital transducers being provided with plural portions of mutually different pitches of the electrode fingers, respectively corresponding to different frequencies, and said portions being arranged in parallel manner in a direction perpendicular to the propagating direction of the surface acoustic waves; and a wave guide path provided on said piezoelectric substrate, for outputting a convolution signal by the surface acoustic wave excited by said plural interdigital transducers; wherein the surface acoustic waves generated by said interdigital transducers in said surface acoustic wave device are entered in concentrated manner into said wave guide path.
Claim 32
Dependent Claim
179 words
A communication system comprising: a transmitter for transmitting a signal modulated according to information; and a receiver including: a code generator for generating a reference signal; a surface acoustic wave device for outputting a convolution signal of a received signal and the reference signal; and a circuit for demodulating information, using the convolution signal outputted from said surface acoustic wave device, said surface acoustic wave device including: a piezoelectric substrate; plural interdigital transducers provided on said piezoelectric substrate, for exciting surface acoustic waves; each of said interdigital transducers being provided with plural portions of mutually different pitches of the electrode fingers, respectively corresponding to different frequencies, and said portions being arranged in parallel manner in a direction perpendicular to the propagating direction of the surface acoustic waves; and a wave guide path provided on said piezoelectric substrate, for outputting a convolution signal by the surface acoustic wave excited by said plural interdigital transducers; wherein the surface acoustic waves generated by said interdigital transducers in said surface acoustic wave device are entered in concentrated manner into said wave guide path.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-18 | 1999-06-19 | 1999-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-18 | 2003-06-19 | 2003-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-18 | 2007-06-19 | 2007-12-19 | $7700.00 | Window Closed / Lapsed |