Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1975-12-29
1977-06-07
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
310 89, 310 98, H03H 926, H03H 930, H03H 910, H01L 4122
Patent
active
040286460
ABSTRACT:
This invention provides a surface elastic wave device constituted by a unitary body of a piezoelectric plate having a pair of transducers thereon, which unitary body is embedded in a casing, and wherein the wave propagation of a surface elastic wave generated on the surface of the piezoelectric plate during excitation of the device is prevented from being transferred to the casing by a thin film inserted between the casing and the wave propagation surface of the piezoelectric plate or by using as the casing a roll of flexible sheet which has the same function of wave propagation prevention as that of the thin film. This device is advantageous because it has a low spurious signal level without incrementing insertion loss, is easy to manufacture and is inexpensive. This invention also provides an effective method of making the device.
REFERENCES:
patent: 3872331 (1975-03-01), Falco
patent: 3885173 (1975-05-01), Lee
Hagiwara Kitokazu
Ikushima Hiroshi
Nagata Takashi
Nakajima Yasuo
Matsushita Electric - Industrial Co., Ltd.
Nussbaum Marvin
Smith Alfred E.
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