H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/59 (2006.01) H03H 9/00 (2006.01) H03H 9/64 (2006.01) H04B 7/00 (2006.01) H04R 17/00 (2006.01) H03H 9/02 (2006.01)
Patent
CA 2349128
SAW devices such as interdigital transducers (IDTs) have been widely used in RADAR applications and as filters. 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, conventional SAW expanders and compressors typically have insertion losses greater than 20 dB, which can have a profound effect on an RF link budget in a communication system. Insertion losses are drastically reduced by using a single phase unidirectional transducer (SPUDT-type) instead of a conventional IDT as a SAW expander/compressor. A SPUDT-type reflects SAW components which are lost in conventional IDT designs so that a stronger SAW is directed toward a transmission element. In a receiver, a SPUDT-type directs a stronger S,AW toward a compressor IDT. A communication system based on SPUDT-type techniques would be low-cost, low-power, small and simple alternative to known short range communications schemes, including for example the Bluetooth TM solution. Operation of a SAW system at a frequency of 2.4 GHz is contemplated.
Campbell Colin K.
Edmonson Peter J.
Research In Motion Limited
Sim & Mcburney
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