Helical filter

Details Helical filter Helical filter

1990-08-22

1991-11-19

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333235, H01P 120

Patent

active

050669320

ABSTRACT:
A helical filter is provided which includes a plurality of coupled helical coils each wound around one of a plurality of substantially parallel elongated bobbins having first and second end portions. Each of the coils has an open end at a first end thereof and a grounded end at a second end thereof. A moving member for adjusting the resonance frequency of the filter is provided at the first end portion of one of the bobbins, and a bandwidth-adjusting screw is provided in the hollow interior region of one of the bobbins at the second side thereof. The screw is accessible from the second end portiion of the bobbin so as to be rotated for adjustment of the bandwidth of the filter. The bandwidth-adjusting screw is disposed at the grounded second end of the helical coil wound around the hollow bobbin.

REFERENCES:
patent: 2946847 (1960-07-01), Callender
patent: 3691487 (1972-09-01), Yoshimoto
patent: 4061992 (1977-12-01), Inokuchi
patent: 4365221 (1982-12-01), Vizmuller
patent: 4385279 (1983-05-01), Meador

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