Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1981-03-30
1983-02-15
Kozma, Thomas J.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
336 84C, 336 87, H01P 120, H01P 700
Patent
active
043743706
ABSTRACT:
A helical resonator filter comprising two or more helical coils is provided with a conductive coupling element between the helical coils for modifying the filter bandwidth. A coupling element is a conductor and is positioned in the maximum of the electrical field at the open end of the helical coils or at the maximum of the magnetic field at the grounded end of the coils, or both thereby creating controlled change in capacitive (electrical) or inductive (magnetic) coupling, respectively. A block of suitable dielectric with grooves for receiving the coupling element and the ribs on the inside of a conductive cover can be used to center the coupling element and the whole filter assembly structure when the cover is put in place and clamps the block securely to the base of the filter. Additional coupling elements can be used in a similar manner as above when additional helical coils are used in a filter.
REFERENCES:
patent: 1911980 (1933-05-01), Vance
patent: 1993794 (1935-03-01), Meyerhans
patent: 2308863 (1943-01-01), Craymer
patent: 2383475 (1945-08-01), Dodington
patent: 2570650 (1951-10-01), Davis
patent: 2691141 (1954-10-01), Hollis
patent: 3621484 (1971-11-01), Sholt
patent: 3691487 (1972-09-01), Yoshimoto
patent: 3836881 (1974-09-01), Koizumi
patent: 4200853 (1980-04-01), De Jong et al.
patent: 4210884 (1980-07-01), Tabuchi et al.
patent: 4284966 (1981-08-01), Wanat
Popovski George N.
Vizmuller Peter
Gillman James W.
Hackbart Rolland R.
Kozma Thomas J.
Motorola Inc.
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