Helical resonator band pass filter with novel coupling means

Details Helical resonator band pass filter with novel coupling means Helical resonator band pass filter with novel coupling means

1978-06-05

1980-07-01

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333212, 333219, H01P 700, H01P 500, H01P 120

Patent

active

042108845

ABSTRACT:
In a band pass filter having a plurality of helical resonators each including a quarter-wavelength winding, at least two of the helical resonators are substantially shielded from each other by a partition wall, while the corresponding two quarter-wavelength windings which are shielded from each other are electrically connected to each other through a lead line which is insulated from the shield casing, thereby improving the cut off characteristic of the filter to cut off the applied signal more rapidly in the high frequency region of the band being filtered than in the low frequency region.

REFERENCES:
patent: 3293644 (1966-12-01), Loos et al.
patent: 3337791 (1967-08-01), Barton et al.
Sverev et al., "Realization of a Filter with Helical Components" in IRE Trans. on Component Parts, Part 8, No. 3, Sep. 1961, pp. 99-110.
Macalpine et al., "Resonators with Helical Inner Conductor" in Proceedings of the IRE, Dec. 1959, pp. 2099-2104.

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