Waveguide frequency multiplier

Claim 2

A waveguide frequency multiplier comprising: a waveguide having a constant cross-section throughout its length, said waveguide having a cut-off frequency above an input frequency to said multiplier; an output filter disposed in said waveguide at one end thereof, said output filter being tuned to an output frequency of said multiplier equal to a given harmonic of said input frequency; and an input filter disposed in said waveguide at the other end thereof, said input filter being an evanescent mode filter tuned to said input frequency.

Claim 3

A multiplier according to claim 1, further including a non-linear reactance device disposed in said waveguide between said input and output filters.

Claim 4

A multiplier according to claim 1, wherein said waveguide has a cut-off frequency above that of said output frequency; and said output filter includes an evanescent mode filter tuned to said output frequency.

Claim 5

A multiplier according to claim 3, wherein said waveguide has a square cross-section.

Claim 6

A multiplier according to claim 3, further including at least one intermediate filter disposed in said waveguide between said input and output filters, said intermediate filter being an evanescent mode filter tuned to an appropriate frequency intermediate said input and output frequencies.

Claim 7

A multiplier according to claim 5, further including a first non-linear reactance device disposed in said waveguide between said input filter and said intermediate filter; and a second non-linear reactance device disposed in said waveguide between said intermediate filter and said output filter.

Claim 8

A multiplier according to claim 1, wherein said waveguide has a cut-off frequency below that of said output frequency and dimensioned such that said output filter is propagating in a dominant mode at said output frequency.

Claim 9

A multiplier according to claim 7, wherein said waveguide has a rectangular cross-section.

Claim 10

A waveguide frequency multiplier comprising: a length of waveguide having a constant cross-section throughout its entire length, said length of waveguide including a first portion and a second portion, said length of waveguide having a cut-off frequency above a given input frequency to said multiplier; a non-linear reactance device disposed in said length of waveguide between said first and second portions, said device being responsive to said input frequency to generate harmonics thereof; a plurality of capacitive screws spaced along one wall of and extending through said one wall into said first portion between an input end of said first portion and said device so that when said input frequency is applied to said input end said first portion functions as a multiple section evanescent mode filter to transfer energy at said input frequency to said device; and a harmonic frequency selecting filter disposed in said second portion for transferring energy at a selected harmonic frequency through said second portion.

Claim 11

A waveguide frequency multiplier comprising: a length of waveguide having a constant cross-section throughout its entire length, said length of waveguide including a first portion and a second portion, said length of waveguide having a cut-off frequency above a given input frequency to said multiplier; a non-linear reactance device disposed in said length of waveguide between said first and second portions, said device being responsive to said input frequency to generate harmonics thereof; a plurality of capacitive screws spaced along one wall of and extending through said one wall into said first portion between an input end of said first portion and said device so that when said input frequency is applied to said input end said first portion functions as a multiple section evanescent mode filter to transfer energy at said input frequency to said device; and a harmonic frequency selecting filter disposed in said second portion for transferring energy at a selected harmonic frequency through said second portion.

Claim 12

A multiplier according to claim 9, further including a plurality of metal cups conductively attached to an inner surface of a wall of said first portion opposite said one wall, each of said cups being disposed to receive a different one of said plurality of screws in a coaxial relationship therewith.

Claim 13

A multiplier according to claim 10, further including an inner lining of dielectric material disposed in each of said cups to electrically insulate each of said cups from its associated one of said screws.