Weighting surface wave filters by withdrawing electrodes

Details Weighting surface wave filters by withdrawing electrodes Weighting surface wave filters by withdrawing electrodes

1973-08-10

1976-03-23

Borchelt, Archie R.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310 98, 333 30R, H03H 920, H03H 926, H01L 4110, H01L 4122

Patent

active

039463427

ABSTRACT:
Prior art methods for shaping the impulse response of a surface wave delay line interdigital transducer include finger width weighting and finger overlap weighting. The new method for shaping the transducer impulse response disclosed herein overcomes several objectional characteristics of the prior art methods. The new method involves removal of individual fingers or groups of fingers from selected portions of the transducer. The amplitude of the impulse response in those regions from which fingers have been removed is reduced below the value which it would have if no fingers had been removed. The method thus provides the capability to control the relative amplitudes of the impulse response along the length of the transducer.

REFERENCES:
de Klerk - "Ultrasonic Transducers 3, Surface Wave Transducers" in Ultrasonics Jan. 1971, pp. 39-41.
Dieulesaint et al. - "Acoustic Surface Wave Filters" in Ultrasonics Jan. 1973; pp. 25-30.
Hartemann et al. - "Intrinsic Compensation of Sidelobes in Dispersive Acoustic Delay Line" in Electronic Letters Vol. 5., No. 10, May 15, 1969, pp. 219-220.

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