Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Reexamination Certificate
2007-09-28
2010-06-29
Maung, Nay A (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
C455S313000, C375S151000, C375S153000, C333S150000, C333S154000, C333S193000, C340S010100
Reexamination Certificate
active
07747220
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.
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PCT/CA00/00547 International Search Report, Sep. 13, 2000, 4 pgs.
Campbell Colin K.
Edmonson Peter J.
Jones Day
Liang Robert C.
Maung Nay A
Pathiyal Krishna K.
Research In Motion Limited
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