| 摘要 |
<p>A band-pass filter on surface acoustic waves comprises a piezoelectric sublayer (1) on whose surface are located in consecutive order an input apodictic electroacoustic converter (2) with an inclined apodictic structure, a phase compensator (6), a screen (7) and an output non-apodictic electroacoustic converter (9). The sumimg buses (3, 4) of the apodictic converter (2) are V-shaped and each consists of two sections, one of which is oriented parallel to the direction of propagation of the surface acoustic waves and the other is bent at an angle γ in relation to the former. The phase compensator (6) consists of a metallized section shaped as an acute triangle whose base ''a'' and height ''b'' correspond to the following relationships: a = L/4 - d, b = (L/2 - d)tg γ, where L is the length of the apodictic converter, d is the projection of the width of the bent-out section of the bus in the direction of propagation of the surface acoustic waves. The band-pass filter is intended preferably for use in television sets and video cassette recorders.</p> |
