Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1975-07-09
1977-02-08
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
310 83, 310 98, H03H, H03H, H03H, H01L 4110
Patent
active
040074331
ABSTRACT:
An elastic surface wave filter is disclosed which is composed of a substrate for the propagation thereon of elastic surface waves and transmitting and receiving transducers, each having at least an electrode deposited on the major surface of the substrate and in which the transmitting and receiving transducers are disposed line connectin the major surface of the substrate a predetermined distance apart from each other; the electrode of one or both of the transmitting and receiving transducers is formed with first and second comb-shaped electrodes; and the first and second electrodes are disposed with each electrode element of the latter extending between adjacent ones of the electrode elements of the former. The electrode elements of the first and/or second comb-shaped electrodes are weighted in terms of length and the extent of the region of overlapping of the first and second comb-shaped electrodes in a first direction, i.e. parallel to a line connecting the transmitting and receiving transducers, is the same at any point in a second direction perpendicular to the first direction.
REFERENCES:
patent: 3633132 (1972-01-01), Hartemann
patent: 3663899 (1972-05-01), Dieulesaint et al.
patent: 3699364 (1972-10-01), Gerard
patent: 3818382 (1974-06-01), Holland et al.
patent: 3835422 (1974-09-01), Hartemann
Houkawa Kouji
Ishihara Fujio
Nippon Telegraph and Telephone Public Corporation
Nussbaum Marvin
Smith Alfred E.
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