Circularly polarized wave-linearly polarized wave transducer

A circularly polarized wave-linearly polarized wave transducer comprising:

• a waveguide having
• a) a first end with an inner wall section having a first diameter, and
• b) a second end with an inner wall section in a shape of a circle and having a first partial circular portion with a second diameter in combination with a second partial circular portion with a third diameter i) different from the second diameter and ii) orthogonal to the second diameter, and
• c) a linear taper extending along the inner wall from the first end of the waveguide to the second end of the waveguide,
• wherein the inner wall section of the second end of the waveguide has an elliptical shape.

A wave transducer for use with a circularly polarized wave comprising:

• a waveguide having
• a first end and a second end opposite the first end and an axial direction, and
• an inner wall tapered in the axial direction, including a plurality of curved axial inner wall portions extending from the first end to the second end of the waveguide, adjacent ones of said plurality of curved axial inner wall portions having different linear tapers in the axial direction inside the waveguide,
• wherein an inner wall section of the second end of the waveguide has an elliptical shape.

A wave transducer for use with a circularly polarized wave comprising:

• a waveguide having
• a first end and a second end opposite the first end and an axial direction, and
• an inner wall tapered in the axial direction, including a plurality of curved axial inner wall portions extending from the first end to the second end of the waveguide, adjacent ones of said plurality of curved axial inner wall portions having different linear tapers in the axial direction inside the waveguide,
• the first end includes
• a first diameter in a first portion of the inner wall, the first diameter having a first constant gradient in the axial direction of the waveguide, and
• a second diameter in a second portion of the inner wall, the second diameter having a second constant gradient different from the first constant gradient in the axial direction of the waveguide,
• the second end includes
• a third diameter in the first portion of the inner wall, and
• a fourth diameter in the second portion of the inner wall,
• the first portion having the first constant gradient extends from the first end of the waveguide to the second end of the wave guide and the diameter of the waveguide in the first portion varies between the first diameter and the third diameter, and
• the second portion having the second constant gradient extends from the first end of the waveguide to the second end of the wave guide and the diameter of the waveguide in the second portion varies between the second diameter and the fourth diameter, wherein
• the first portion of the inner wall of the wave guide includes two curved one-quarter portions of the inner wall,
• the second portion of the inner wall of the wave guide includes the remaining two curved one-quarter portions of the inner wall,
• the inner wall at the first end of the waveguide alternates between the first diameter and the second diameter, and
• the inner wall at the second end of the waveguide alternates between the third diameter and the fourth diameter.

A circularly polarized wave-linearly polarized wave transducer comprising:

• a circular waveguide having an axial direction and a curved inner wall defining a plurality of axial sections perpendicular to the axis of the circular waveguide,
• each axial section of said plurality of axial sections having a respective constant gradient in the axial direction, and
• one of said plurality of axial sections being tapered with a first constant gradient, another of said sections being tapered with a second constant gradient different from said first constant gradient, the taper gradient in the axial direction is different in plural portions in the circumferential direction of the inner wall,
• wherein an inner wall section of at least one end of the waveguide has an elliptical shape.