Evanescent mode triple ridge lowpass harmonic filter

Details Evanescent mode triple ridge lowpass harmonic filter Evanescent mode triple ridge lowpass harmonic filter

1984-11-02

1987-06-16

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333248, H01P 1211

Patent

active

046739033

ABSTRACT:
A waveguide lowpass filter has successive groups of three separate ridges spaced longitudinally in said filter. A center ridge of each filter has a larger cross-sectional area than two side ridges which are the same size. All ridges are parallel to one another in a longitudinal direction. The groups are associated with shunt capacitances and the spaces between adjacent groups are associated with series inductances in an evanescent mode. In operation, the filter is capable of supporting a TE.sub.10 mode in the passband and three modes, TE.sub.10, TE.sub.20 and TE.sub.30 in the stopband. The filter has a relatively high power handling capability as compared to previous evanescent mode lowpass harmonic filters.

REFERENCES:
patent: 2785381 (1957-03-01), Brown
patent: 3046503 (1962-07-01), Vohn
patent: 3271706 (1966-09-01), Rooney
Young et al., "New & Improved Types of Waffle Iron Filters", Proc. IEEE, vol. 110, No. 7, Jul. 1963, pp. 1191-1198.

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