Microwave tube transformer-window assembly having a window thickness equivalent to one-quarter wavelength and metallic step members to transform impedance

Claim 2

A microwave waveguide seal and transformation assembly comprising a first waveguide portion of first cross section and first impedance, a second waveguide portion of second Cross section and second impedance larger than said first cross section and impedance, and connected to said first waveguide portion, a dielectric member located and sealed within said second waveguide portion adjacent the connection with said first waveguide portion, said dielectric member having a thickness equivalent to a quarter of the guide wavelength and a third impedance between said first and said second impedances, at least one metallic member positioned in said second waveguide portion on the side of said dielectric member opposite said first waveguide portion, said metallic member dimensioned to provide within said second waveguide a fourth impedance between said third and said second impedances.

Claim 3

The microwave waveguide assembly of claim 1 with substantially equal differences between successive impedances between said first and second impedances.

Claim 4

The microwave waveguide assembly of claim 2, wherein said metallic member is dimensioned to provide said fourth impedance over a length equivalent to a quarter of the guide wavelength.

Claim 5

In a microwave tube having an interior waveguiding portion of a first cross section and maintained at a predetermined pressure less than atmospheric pressure to provide a first impedance, and a contiguous exterior waveguiding portion of a second cross section larger than said first cross section and maintained at a pressure greater than that of said interior waveguiding portion to provide a second impedance greater than said first impedance; a microwave-permeable window positioned and sealed within said exterior waveguide portion adjacent said interior waveguiding portion, said window having a thickness equivalent to a quarter of the guide wavelength and a third impedance between said first and second impedances, and at least a pair of metallic step members in said exterior waveguide portion exteriorly of said window and dimensioned to provide a pair of impedance regions between said window and said exterior waveguiding portion with substantially equal impedance steps between said third and second impedances.

Claim 6

In a microwave tube having an interior waveguiding portion of a first cross section and maintained at a predetermined pressure less than atmospheric pressure to provide a first impedance, and a contiguous exterior waveguiding portion of a second cross section larger than said first cross section and maintained at a pressure greater than that of said interior waveguiding portion to provide a second impedance greater than said first impedance; a microwave-permeable window positioned and sealed within said exterior waveguide portion adjacent said interior waveguiding portion, said window having a thickness equivalent to a quarter of the guide wavelength and a third impedance between said first and second impedances, and at least a pair of metallic step members in said exterior waveguide portion exteriorly of said window and dimensioned to provide a pair of impedance regions between said window and said exterior waveguiding portion with substantially equal impedance steps between said third and second impedances.

Claim 7

In a microwave tube of claim 4, said window and step member dimensioned to provide substantially equal differences between successive impedances between first and second impedances.

Claim 8

In a microwave tube of claim 5, said step members dimensioned to provide said respective impedances over lengths equivalent to quarter wavelengths of the guide.