Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1974-11-21
1976-03-16
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
310 82, 310 98, 333 70R, H03H 920, H03H 926, H03H 932
Patent
active
039449513
ABSTRACT:
An improved monolithic crystal filter is disclosed. The filter has input and output ports formed from particular combinations of first, second and third terminals, the latter terminals having been adapted to be connected to certain preselected electrodes of the two adjacent resonators comprising the filter. More specifically, the first terminal is adapted to be connected to one of the electrodes of a first one of the aforesaid two resonators, the second terminal to the other electrode of the first resonator and to one of the electrodes of the second of the two resonators, and the third terminal to the remaining electrode of the second resonator. With the first, second and third terminals so adapted, the employment of the first and third terminals as one of the input and output ports of the filter and the employment of any other combination of two of the terminals as the other one of the input and output ports thereof results in a filter which is found to exhibit two finite frequency attenuation poles whose locations can be varied by varying the filter parameters. As a result, by proper selection of such filter parameters, the attenuation poles of the filter can be made to bracket the filter passband, thereby causing the filter attenuation characteristic to steeply rise near the edges of such band.
REFERENCES:
patent: 2233199 (1941-02-01), Donley
patent: 2373431 (1945-04-01), Sykes
patent: 2429639 (1947-10-01), McSkimin
patent: 3334307 (1967-08-01), Blum
patent: 3564463 (1971-02-01), Beaver et al.
patent: 3656180 (1972-04-01), Braun
patent: 3739304 (1973-06-01), Braun
patent: 3831116 (1974-08-01), Davis, Jr. et al.
patent: 3836877 (1974-09-01), Guntersdorfer
Bell Telephone Laboratories Incorporated
Nussbaum Marvin
Smith Alfred E.
Torrente John J.
Wisner Wilford L.
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