| 摘要 |
<p>A distributed acoustic reflection transducer has a reflection function comprising at least one sign change, i.e. it has at least one reflector (7) and generally a set of reflectors with a centre at a distance k μ/2 + μ/4 from the centre of the other reflectors, μ being the wavelength corresponding to the operational centre frequency of the transducer. Said transducer may be used to produce surface wave filters for radio systems.</p> |
