Folded-over helical resonator

Details Folded-over helical resonator Folded-over helical resonator

1981-11-10

1983-12-20

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333219, 333235, 333222, H01P 1201, H01P 1208, H01P 700

Patent

active

044220588

ABSTRACT:
A helical resonator includes a helical coil with one end flared out and folded back over a portion of the cylindrical helix made by the coil to create a winding of opposite pitch superimposed over the cylindrical helix. As an alternative design, a resonator is formed of a helical coil of a first length connected to a helical of opposite pitch. This resonator inhibits a third harmonic resonance but re-resonates around the fourth harmonic. When this resonator is used in combination with a conventional helical resonator, the undesired re-resonances are suppressed.

REFERENCES:
patent: 1575824 (1926-03-01), Eiffert
patent: 2431045 (1947-11-01), Johnson
patent: 2843683 (1958-07-01), Lewis, Jr.
patent: 3621484 (1971-11-01), Shult
patent: 3851830 (1974-12-01), Barthalon
patent: 3936776 (1976-02-01), Sundquist
patent: 3987386 (1976-10-01), Valliere

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