Circularly polarized horn antenna
First Claim
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1. A horn antenna, comprising:
- a circular polarizer comprising a slab of dielectric material having a rectangular cross section, the slab having a first portion of a first width and a second portion of a second width smaller than the first width such that the slab has a step shape, the second portion of the slab being positioned at an aperture of the horn antenna, wherein the first portion of the slab has a first side and a second side, the first side and the second side being separated by the first width, and the second portion of the slab has a third side and a fourth side that are separated by a second width, wherein the second portion is positioned between the first side and the second side and displaced from the first side and the second side, wherein the second portion has a substantially flat end extending between the third side and the fourth side.
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Abstract
In some embodiments, a circularly polarized horn antenna may include a circular polarizer having a step shape. In some embodiments, a circularly polarized horn antenna may include a choke that is offset in position with respect to the antenna aperture. Such antennas may have a relatively constant beamwidth with respect to frequency, compact size, and/or low weight.
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Citations
20 Claims
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1. A horn antenna, comprising:
a circular polarizer comprising a slab of dielectric material having a rectangular cross section, the slab having a first portion of a first width and a second portion of a second width smaller than the first width such that the slab has a step shape, the second portion of the slab being positioned at an aperture of the horn antenna, wherein the first portion of the slab has a first side and a second side, the first side and the second side being separated by the first width, and the second portion of the slab has a third side and a fourth side that are separated by a second width, wherein the second portion is positioned between the first side and the second side and displaced from the first side and the second side, wherein the second portion has a substantially flat end extending between the third side and the fourth side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A horn antenna, comprising:
a ring-shaped choke displaced from an aperture of the horn antenna by a distance of between 0. 55λ
center and 0.61λ
center inclusive, where λ
center is a wavelength of a radio wave at a center frequency of a radio frequency band upon which the horn antenna is designed to operate.- View Dependent Claims (18, 19, 20)
Specification