Dielectric lens, dielectric lens device, design method of dielectric lens, manufacturing method and transceiving equipment of dielectric lens
First Claim
1. A design method of a dielectric lens having a front face on the radiator side of the dielectric lens and a rear face on the non-radiator side of the dielectric lens comprising:
- (a) determining a desired aperture distribution;
(b) converting Snell'"'"'s law at the rear face, electric power conservation law, and the formula representing light-path-length constraint, into simultaneous equations, and computing the shapes of the front face and rear face surfaces at the azimuthal angle θ
of a primary ray from the focal point of the dielectric lens to the rear face of the dielectric lens; and
(c) reducing the light path length in said formula showing light-path-length constraint by an integral multiple of the wavelength in the air when the coordinates on the surface of the dielectric lens reach a predetermined restriction thickness position;
repeating (b) and (c) at least once;
wherein said azimuthal angle θ
of a primary ray is changed from its initial value.
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Accused Products
Abstract
A design process first determines a desired aperture distribution, then converts the electric power conservation law, Snell'"'"'s law on the rear face side of a dielectric lens, and the formula representing light-path-length constraint, into simultaneous equations, and computes the shapes of the surface and rear face of the dielectric lens depending on the azimuthal angle θ of a primary ray from the focal point of the dielectric lens to the rear face of the dielectric lens, and then reduces the light path length in the formula showing light-path-length constraint by an integral multiple of the wavelength when the coordinates on the surface of the dielectric lens reach a predetermined restriction thickness position. A dielectric lens is designed by sequentially changing the lazimuthal angle θ from its initial value, and also repeating the second and third steps. Thus, downsizing and quantification is realized by zoning while keeping antenna properties at the time of constituting a dielectric lens antenna in a good condition.
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Citations
20 Claims
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1. A design method of a dielectric lens having a front face on the radiator side of the dielectric lens and a rear face on the non-radiator side of the dielectric lens comprising:
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(a) determining a desired aperture distribution; (b) converting Snell'"'"'s law at the rear face, electric power conservation law, and the formula representing light-path-length constraint, into simultaneous equations, and computing the shapes of the front face and rear face surfaces at the azimuthal angle θ
of a primary ray from the focal point of the dielectric lens to the rear face of the dielectric lens; and(c) reducing the light path length in said formula showing light-path-length constraint by an integral multiple of the wavelength in the air when the coordinates on the surface of the dielectric lens reach a predetermined restriction thickness position; repeating (b) and (c) at least once; wherein said azimuthal angle θ
of a primary ray is changed from its initial value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A dielectric lens of which the principal portion forms a rotationally symmetrical member with the optical axis as a rotation center, and a front-side surface opposite to a primary radiator comprising:
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multiple front-side refraction faces which protrude from the front-side surface; and a stepped face which connects adjoining front-side refraction faces; wherein the stepped face forms an angle within the limits of ±
20°
to the primary ray which enters into an arbitrary position of a rear face which faces said primary radiator from a focal point, and progresses within the lens, and a curved face by zoning is provided in the position in said rear face of the primary ray passing through said front-side refraction face. - View Dependent Claims (13, 14, 15, 16)
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9. A dielectric lens of which the principal portion forms a rotationally symmetrical member with the optical axis as a rotation center, and a front-side surface opposite to a primary radiator comprising:
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multiple front-side refraction faces which protrude from the front-side surface; and a stepped face which connects adjoining front-side refraction faces; wherein the stepped face forms within the limits of ±
20°
to the primary ray which enters into an arbitrary position of a rear face which faces said primary radiator from a focal point, and progresses within the lens, and a curved face by zoning is provided in the position in said rear face of the primary ray passing through said front-side refraction face, and wherein the curved face by zoning between said front-side refraction face and said rear face is a curved face obtained by Snell'"'"'s law regarding the rear face, light-path-length conditions, and the electric power conservation law which provides a desired aperture distribution. - View Dependent Claims (10, 11, 12, 17, 18, 19, 20)
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Specification