Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Reexamination Certificate
2007-11-06
2007-11-06
Maung, Nay (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
C455S188100, C455S313000, C455S323000, C342S042000, C342S043000, C342S050000, C342S051000, C342S060000, C342S175000, C375S147000, C375S150000, C375S152000, C375S153000
Reexamination Certificate
active
10946420
ABSTRACT:
An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation of a SAW input to the IDT and thereby lends itself to further application as a signal generator in a communication device. However, internal dimensions of IDTs are inversely proportional to operating frequency, such that high frequency IDTs present significant manufacturing difficulties. Fabrication of IDTs for high frequency applications is simplified by exploiting a harmonic frequency SAW generated by IDTs. An IDT may therefore be designed according to fundamental frequency internal dimension criteria but can operate at a multiple of the fundamental frequency, thereby providing much higher frequency operation than conventional SAW systems. Operation of a second harmonic SAW system at 2.4 GHz based on a fundamental frequency of 1.2 GHz is contemplated.
REFERENCES:
patent: 2742618 (1956-04-01), Weber
patent: 2745067 (1956-05-01), True et al.
patent: 4015223 (1977-03-01), Cheze
patent: 4247903 (1981-01-01), Grudkowski et al.
patent: 4249146 (1981-02-01), Yen et al.
patent: 4405874 (1983-09-01), Suthers
patent: 4612669 (1986-09-01), Nossen
patent: 4737790 (1988-04-01), Skeie et al.
patent: 4746830 (1988-05-01), Holland
patent: 5170500 (1992-12-01), Broderick
patent: 5187454 (1993-02-01), Collins et al.
patent: 5438306 (1995-08-01), Yamanouchi et al.
patent: 5459440 (1995-10-01), Claridge et al.
patent: 5564086 (1996-10-01), Cygan et al.
patent: 5568002 (1996-10-01), Kawakatsu et al.
patent: 5631611 (1997-05-01), Luu
patent: 5778308 (1998-07-01), Sroka et al.
patent: 5790000 (1998-08-01), Dai et al.
patent: 5835990 (1998-11-01), Saw et al.
patent: 5889252 (1999-03-01), Williams et al.
patent: 5905324 (1999-05-01), Shiba et al.
patent: 6255915 (2001-07-01), Edmonson
patent: 6462698 (2002-10-01), Campbell et al.
patent: 6535545 (2003-03-01), Ben-Bassat et al.
patent: 0 047 354 (1982-03-01), None
patent: 0 797 315 (1997-09-01), None
patent: 0 800 270 (1997-10-01), None
patent: 9-162757 (1997-06-01), None
patent: 11-88201 (1999-03-01), None
Endoh, G. et al.: “High Performance Balanced Type SAW Filters in the Range of 900 MHz and 1.9GHz,” IEEE Ultrasonics Symposium, New York, USA, Oct. 5, 1997, pp. 41-44 (XP-000848455).
Edmonson, P. et al.:“Radiation Conductance and Grating Reflectivity Weighing Parameters for Dual Mode Leaky-SAW Resonator Filter Design,” Department of Electrical and Computer Engineering, McMaster University, Hamilton, Canada, 1994 Ultrasonics Symposium, pp. 75-79.
Edmonson, P.: “Coupling-Of-Modes Studies of Surface Acoustic Wave Oscillators and Devices,” A Thesis Submitted to the School of Graduate Studies in Partial Fulfilment of Requirements for the Degree of Doctor of Philosophy, McMaster University, Feb. 1995, pp. 19, 83.
Saw, et al.: “Improved Design of Single-Phase Unidirectional Transducers for Low-loss Saw Filters,” Proceedings of the Ultrasonics Symposium, Denver, Oct. 14-16, 1987, New York, US, IEEE, vol. 1, 1987, pp. 169-172 (XP 000570867).
Huegli, R.: “GHz Filters with Third Harmonic Unidirectional Transducers,” Proceedings of 1990 Ultrasonics Symposium, pp. 165-168, IEEE Publication 1051-0117/90/0000-0165 (XP 002185586).
Fleischmann, B. et al.: “Higher Harmonic Surface Transverse Wave Filters,” Proceedings of 1989 Ultrasonics Symposium; pp. 235-239; IEEE Publication 0090-5607/89/0000-0235.
Dill, R. et al.: “Ghz Low-Loss Filters on LITAO3 Operating at Higher Harmonics,” Proceedings of 1989 Ultrasonics Symposium; pp. 251-254; IEEE Publication 0090-5607/89/0000-0251.
Huegli, R.: “Harmonic GHz Surface-Acoustic Wave Filters with Unidirectional Transducers,” IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control; vol. 40, No. 3, May 1993; pp. 177-182; IEEE Publications 0885-3010/93.
Hines, J. et al.: “A High Frequency SAW Device Transducer Structure Using Conventional Manufacturing Processes,” Proceedings of 1994 Ultrasonics Symposium; pp. 93-97; IEEE Publication 1051-0117/94/0000-0093.
Sato, T. et al.: “Experimental Investigation on the Operation of SAW Devices at Harmonic Frequencies with Stepped-Finger Interdigital Transducer,” Proceedings of 1996 IEEE Ultrasonics Symposium; pp. 267-270; IEEE Publication 0-7803-3615-1/96.
Hode, J. et al.: “Application of Low Loss S.A.W. Filters to RF and IF Filtering in Digital Cellular Radio Systems,” Proceedings of 1990 IEEE Ultrasonics Symposium; pp. 429-434; IEEE Publication 1051-0117/90/0000-0429 (XP-000290093).
Takehara, K.: “A SAW-Based Spread Spectrum Wireless LAN System,” IEICE Transactions on Communications, E76-B (1993) August, No. 8, Tokyo, Japan, pp. 990-995 (XP-000396903).
Hikita, M. et al.: “A Wideband SAW Resonator and Its Application to a VCO for Mobile Radio Transceivers,” 8105 IEEE Transactions on Vehicular Technology, 43 (1994) November, No. 4, New York, US, pp. 863-869 (XP-000493417).
PCT/CA00/00547 International Search Report, Sep. 13, 2000, 4 pgs.
Campbell Colin K.
Edmonson Peter J.
Jones Day
Liang Robert C.
Pathiyal Krishna K.
Research In Motion Limited
Young Janelle N.
LandOfFree
Wireless communication system using surface acoustic wave... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wireless communication system using surface acoustic wave..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wireless communication system using surface acoustic wave... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3882109