Rotary vane attenuator wherein rotor has orthogonally disposed resistive and dielectric cards

Claim 2

In a rotary vane attenuator of the type including first, second and third waveguide sections aligned along a selected axis, with said first and third sections being stationary and said second center section being rotatable about said axis, with said first and third sections supporting electrically conductive means in a common plane extending through said axis and said second section supporting electrically conductive means in a plane extending through said axis, the improvement comprising: dielectric means in said second section extending orthogonally to the electrically conductive means which is supported in said second section, in a plane which passes through said selected axis.

Claim 3

The arrangement as recited in claim 1 wherein the electrically conductive means in each of said sections is a flat card with a resistive film thereon, and said dielectric means in said second section is a card of dielectric material which is not coated by a resistive film.

Claim 4

The arrangement as recited in claim 2 wherein each of the cards extends the length of the section in which it is supported, and at least the second section is cylindrical with its longitudinal axis coinciding with said selected axis.

Claim 5

A rotary vane attenuator comprising: a first waveguide section having a longitudinal axis extending along and coinciding with a preselected axis; a first card with resistive film thereon, supported in said first waveguide section in a first plane which extends through said preselected axis, said first waveguide section being fixedly positioned about said preselected axis; a second waveguide section, spaced from said first section, and having a longitudinal axis extending along and coinciding with said preselected axis; a second card with a resistive film thereon, supported in said second section in said first plane which extends through said preselected axis; a third waveguide section between said first and second sections and having a longitudinal axis which extends along and coincides with said preselected axis, said third section being rotatable about said preselected axis; a third card with a resistive film thereon, supported in said third section in a plane which extends through said preselected axis; and a fourth card of dielectric material, which does not include a resistive film thereon, supported in said third section in a plane perpendicular to the plane in which the third card is supported, and which extends through said preselected axis.

Claim 6

A rotary vane attenuator comprising: a first waveguide section having a longitudinal axis extending along and coinciding with a preselected axis; a first card with resistive film thereon, supported in said first waveguide section in a first plane which extends through said preselected axis, said first waveguide section being fixedly positioned about said preselected axis; a second waveguide section, spaced from said first section, and having a longitudinal axis extending along and coinciding with said preselected axis; a second card with a resistive film thereon, supported in said second section in said first plane which extends through said preselected axis; a third waveguide section between said first and second sections and having a longitudinal axis which extends along and coincides with said preselected axis, said third section being rotatable about said preselected axis; a third card with a resistive film thereon, supported in said third section in a plane which extends through said preselected axis; and a fourth card of dielectric material, which does not include a resistive film thereon, supported in said third section in a plane perpendicular to the plane in which the third card is supported, and which extends through said preselected axis.