A millimeter wave lens antenna
A lens antenna, millimeter wave technology, applied in the direction of antenna, antenna grounding switch structure connection, electrical components, etc., can solve the problems of low aperture efficiency and radiation efficiency, and achieve the effect of high gain, high radiation efficiency and low profile
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Embodiment 1
[0034] The structure designed in this embodiment is divided into two parts, the first part is the lens structure, and the second part is the feeding structure, and the overall structure of the antenna can be obtained by assembling the two parts.
[0035] Traditional lens antennas such as figure 1 As shown, it is a high-gain directional antenna structure. It is necessary that the distance between the feed source and the convex lens (that is, the focal length) is sufficiently large, so that the lens can better correct the phase of the electromagnetic radiation to obtain a more uniform aperture illumination. high gain.
[0036] Such as image 3 As shown, a millimeter-wave lens antenna includes a lens 1 and a feed 2 oppositely arranged, and also includes a dielectric layer 3 and is used for equivalently increasing the distance between the feed source and the lens so as to realize the radiation electromagnetic wave under the condition of an equivalent long focal length A phase-co...
Embodiment 2
[0044] The difference between this embodiment and Embodiment 1 is:
[0045] Such as Figure 4 As shown, the lens 1 is a Fresnel partition lens, and the partition radius formula of the Fresnel partition lens is: where λ g is the wavelength in the medium layer, F is the sum of focal length and lens thickness, N is the division number of Fresnel lens, N=1, 2, 3..., P is a positive integer, λ / P represents the phase of λ / P Difference correction, when P=2, corresponds to 180-degree phase correction, that is, λ / 2 phase correction Fresnel lens; when P=4, corresponds to 90-degree phase correction, that is, λ / 4 phase correction Fresnel lens; whether the electromagnetic wave is Propagate in free space or in the medium, the thickness d of the partition step of the Fresnel partition lens makes the electric length of the electromagnetic wave in the medium longer than the electric length in air by 1 / P times the wavelength; the corresponding step thickness d The satisfying formula is: w...
Embodiment 3
[0048] The difference between this embodiment and embodiment two is:
[0049] Such as Figure 5 with Image 6 As shown, while the feed source 2 is fed through the circular waveguide, a tapered tapered dielectric strip 6 integrally formed with the dielectric layer 3 is arranged in the circular waveguide, because if the circular waveguide is filled with air, When the electromagnetic wave emitted by the feed source 2 enters the dielectric layer 3 from the air, energy reflection will be caused due to the difference in impedance between the two. By setting the tapered tapered dielectric strip 6 made of polytetrafluoroethylene material, impedance matching can be realized to reduce reflection purpose of loss. In addition, the tapered tapered dielectric strip 6 can also be used in the circular waveguide of the first embodiment.
[0050] In the above-mentioned embodiment, the required lens antenna is obtained by combining the main structure and the feed structure, such as Image 6 ...
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