Wireless keyless entry and tyre pressure monitoring systems based on SAW resonators are catching on in a big way in automotive engineering. Although many applications require ISM bandwidth only momentarily, mutual interference can result if different signals are transmitted simultaneously on the same frequency.
To combat this Epcos developed a two-in-one SAW resonator; the R770 (433,81/434,06 MHz) and R771 (314,875/315,125 MHz). Each type contains two electrically independent, high-precision single-port SAW resonators in a QCC8C SMD ceramic package with a footprint of 5 x 5 mm. Both single-port resonators are implemented on the same chip and fabricated simultaneously in an identical process. This results in superior synchronism against temperature and in frequency response. Almost any desired frequency difference between the two resonators can be designed. In the send oscillator, the two resonators are alternately connected to the oscillator circuit. Switching is done via PIN diodes.
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