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BAW Delay Lines |
Teledyne’s Bulk Acoustic Wave (BAW) Product Line has been producing BAW delay devices
since the
early 1960’s. Over the years,
Teledyne Microwave has constantly improved
BAW technology and is currently the world’s only supplier of microwave bulk acoustic
wave delay devices. Markets for BAW devices include instrumentation and radar altimeters
and are available in both connectorized, pin and surface mount configurations.
BAW devices operate as low as 300 MHz and as high as 17 GHz, usually in sub-bands
of around 10%. Depending on the delay and frequency of operation the insertion loss
is in the range 30 dB to 90 dB.
The basic microwave acoustic delay device form consists of a cylindrical rod of
suitable transmission material (usually sapphire or quartz crystals) for the propagation
of the acoustic wave. At the ends of the rod are transducers for converting electromagnetic
energy to acoustic energy. Electrical matching networks, or filters, are attached
to each of the transducers for coupling to the external microwave circuit. |
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Thus, a microwave signal is coupled through the matching network to the input transducer
which in turn transmits this signal into the acoustic delay medium. Reconversion
to electromagnetic form occurs at the output transducer and the signal appears at
the output electrical network delayed by the propagation time through the acoustic
medium. The slow velocity of elastic waves in solids provides approximately one
microsecond delay per centimeter of delay material, which is more than a factor
of 10,000 shorter than the equivalent path length for a microwave signal in free
space.
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For pdf Catalog:
Teledyne Microwave BAW Products |
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