Terahertz ultra-wideband lens antenna

Abstract

The utility model discloses a terahertz ultra-wideband lens antenna, and relates to the technical field of terahertz. The terahertz ultra-wideband lens antenna comprises a logarithmic helical antenna body and dielectric lenses, the dielectric lenses comprise a hemispherical dielectric lens and a cylindrical dielectric lens, and the radius of the cylindrical dielectric lens is equal to that of the hemispherical dielectric lens. The bottom wall of the cylindrical dielectric lens is attached to the plane wall of the hemispherical dielectric lens, the logarithmic helical antenna body is arranged on the top wall of the cylindrical dielectric lens, and the logarithmic helical antenna body comprises a first helical arm and a second helical arm. The logarithmic helical antenna body has the characteristics of ultra wide band and non-frequency variation, the logarithmic helical antenna body is arranged on the dielectric lens, the dielectric lens can eliminate surface waves generated by optical property discontinuity of the logarithmic helical antenna body and a free space, and meanwhile, beams are focused, so that the radiation direction of the antenna is oriented.

Description

TECHNICAL FIELD

[0001] The utility model relates to terahertz technology field especially relates to a terahertz ultra wide band lens antenna. BACKGROUND

[0002] The terahertz wave in the terahertz antenna usually refers to the electromagnetic wave of frequency 0.1~10THz (wavelength is between microwave and infrared wave 0.03~3 millimeter range), and the terahertz wave fuses the characteristics of microwave millimeter wave technology and infrared optical technology, has short wavelength, wide frequency band, low photon energy, high penetration, high signal-to-noise ratio, fingerprint characteristics, etc., these characteristics make the terahertz wave have extensive prospect in many military and civilian application fields such as high data rate communication, high-precision radar detection, security imaging, nondestructive testing, biomedical, etc.

[0003] At present, the common terahertz antenna has a butterfly antenna, a logarithmic periodic antenna.The butterfly antenna is most widely used, is easy to process, and the impedance fluctuation is smaller when the frequency changes relative to the logarithmic periodic antenna, but it is also difficult to maintain good matching performance in a wide frequency band, and the working frequency band range is narrow, which cannot satisfy the increasing demand;The logarithmic periodic antenna has good gain, but the surface wave generated by the discontinuity of the logarithmic periodic antenna and the free space optical properties will cause the antenna to be difficult to directional radiation. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of terahertz ultra wide band lens antenna, to solve the technical problem that the surface wave generated by the discontinuity of logarithmic periodic antenna and free space optical properties will cause the antenna to be difficult to directional radiation in prior art.

[0005] The utility model provides a kind of terahertz ultra wide band lens antenna, including logarithmic spiral antenna body and dielectric lens, the dielectric lens includes hemispherical dielectric lens and cylindrical dielectric lens, the radius of the cylindrical dielectric lens is equal to the radius of the hemispherical dielectric lens, the bottom wall of the cylindrical dielectric lens is attached to the plane wall of the hemispherical dielectric lens, and the logarithmic spiral antenna body is set to the top wall of the cylindrical dielectric lens.

[0006] The terahertz ultra wide band lens antenna as described above, the height of the cylindrical dielectric lens is 150um.

[0007] The terahertz ultra wide band lens antenna as described above, the radius of the cylindrical dielectric lens and the radius of the hemispherical dielectric lens are both 300um.

[0008] The terahertz ultra wide band lens antenna as described above, the logarithmic spiral antenna body includes first spiral arm and second spiral arm, and the distance between the outer side wall of the first spiral arm end and the outer side wall of the second spiral arm end is 286um.

[0009] The terahertz ultra-wideband lens antenna described above has an operating frequency band covering 200GHz-1000GHz.

[0010] As described above, in the terahertz ultra-wideband lens antenna, the first spiral arm is formed by two equiangular spirals, the number of spiral rotations of the first spiral arm is two circles, and the first spiral arm is rotated 180° on the plane to form the second spiral arm.

[0011] In the terahertz ultrawideband lens antenna described above, the rotation center of the first spiral arm is the center of the cylindrical dielectric lens.

[0012] In the terahertz ultra-wideband lens antenna described above, both the hemispherical dielectric lens and the cylindrical dielectric lens are silicon lenses.

[0013] In the terahertz ultra-wideband lens antenna described above, the dielectric constants of both the hemispherical dielectric lens and the cylindrical dielectric lens are 11.7.

[0014] As described above, the terahertz ultra-wideband lens antenna has a logarithmic spiral antenna body that is a thin metal layer structure.

[0015] Implementing the embodiments of this utility model will have the following beneficial effects:

[0016] In this invention, the terahertz ultra-wideband lens antenna includes a logarithmic spiral antenna body and a dielectric lens. The dielectric lens includes a hemispherical dielectric lens and a cylindrical dielectric lens. The radius of the cylindrical dielectric lens is equal to that of the hemispherical dielectric lens. The bottom wall of the cylindrical dielectric lens is attached to the planar wall of the hemispherical dielectric lens. The logarithmic spiral antenna body is disposed on the top wall of the cylindrical dielectric lens. The logarithmic spiral antenna body includes a first spiral arm and a second spiral arm. The logarithmic spiral antenna body has ultra-wideband and non-frequency-varying characteristics. By placing the logarithmic spiral antenna body on the dielectric lens, the dielectric lens can eliminate surface waves generated by the discontinuity between the logarithmic spiral antenna body and the optical properties of free space, and simultaneously focus the beam, thus orienting the antenna radiation direction. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a terahertz ultrawideband lens antenna according to an exemplary embodiment;

[0019] Figure 2 This is a top view of a terahertz ultrawideband lens antenna according to an exemplary embodiment;

[0020] Figure 3 This is a return loss diagram of a terahertz ultrawideband lens antenna according to an exemplary embodiment;

[0021] Figure 4 This is a test efficiency diagram of a terahertz ultrawideband lens antenna according to an exemplary embodiment;

[0022] Figure 5 This is a radiation pattern of a terahertz ultrawideband lens antenna according to an exemplary embodiment.

[0023] Among them: 1. Hemispherical medium lens; 2. Cylindrical medium lens; 3. First spiral arm; 4. Second spiral arm. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] See Figure 1 and Figure 2 This invention provides a terahertz ultra-wideband lens antenna, comprising a logarithmic spiral antenna body and a dielectric lens. The dielectric lens includes a hemispherical dielectric lens 1 and a cylindrical dielectric lens 2. The radius of the cylindrical dielectric lens 2 is equal to the radius of the hemispherical dielectric lens 1. The bottom wall of the cylindrical dielectric lens 2 is attached to the planar wall of the hemispherical dielectric lens 1. The logarithmic spiral antenna body is disposed on the top wall of the cylindrical dielectric lens 2. The logarithmic spiral antenna body has ultra-wideband and non-frequency-varying characteristics. By placing the logarithmic spiral antenna body on the dielectric lens, the dielectric lens can eliminate surface waves generated by the discontinuity between the logarithmic spiral antenna body and the optical properties of free space, and simultaneously focus the beam, thus orienting the antenna radiation direction.

[0030] The shape of the logarithmic spiral antenna is determined only by the angle and does not include the linear length, which makes the characteristics of the terahertz ultra-wideband lens antenna unaffected by frequency changes and gives it an extremely wide bandwidth.

[0031] Furthermore, the height of the cylindrical dielectric lens 2 is 150 μm; the radius of the cylindrical dielectric lens 2 and the radius of the hemispherical dielectric lens 1 are both 300 μm; the logarithmic spiral antenna body includes a first spiral arm 3 and a second spiral arm 4, and the distance between the outer wall of the end of the first spiral arm 3 and the outer wall of the end of the second spiral arm 4 is 286 μm. This allows the antenna to operate in a frequency band covering 200 GHz-1000 GHz, meeting the usage requirements of mobile devices.

[0032] Furthermore, the logarithmic spiral antenna operates in a frequency band of 200GHz-1000GHz, meeting the usage requirements of mobile devices.

[0033] Furthermore, the first spiral arm 3 is formed by two equiangular helices, and the number of helical rotations of the first spiral arm 3 is two circles. The first spiral arm 3 is rotated 180° in the plane to form the second spiral arm 4. Since the logarithmic spiral antenna can transmit traveling wave current in a finite structure, the current attenuates very quickly, resulting in a very weak termination effect. Therefore, it has extremely smooth frequency characteristics, which ensures the ultra-wideband operation of the antenna.

[0034] Specifically, the edges of the first spiral arm 3 and the second spiral arm 4 are described only by angles, thus satisfying the shape requirements of a non-frequency variable antenna. When the beginning of the first spiral arm 3 and the second spiral arm 4 is fed, the equiangular spirals of the first spiral arm 3 and the second spiral arm 4 can be regarded as a pair of deformed transmission lines. The current on the first spiral arm 3 and the second spiral arm 4 is transmitted, radiated and attenuated along the line. Each small segment on the spiral is a basic radiating plate, and their orientation changes along the spiral. The total radiation field is the superposition of these elementary radiation fields.

[0035] Furthermore, the rotation center of the first spiral arm 3 is the center of the cylindrical medium lens 2.

[0036] Furthermore, both the hemispherical dielectric lens 1 and the cylindrical dielectric lens 2 are silicon lenses. Specifically, the hemispherical dielectric lens 1 and the cylindrical dielectric lens 2 are made of high-resistivity silicon material, which results in less absorption and scattering of terahertz waves.

[0037] Furthermore, the dielectric constant of both the hemispherical dielectric lens 1 and the cylindrical dielectric lens 2 is 11.7. This dielectric constant is a relative dielectric constant, which is the ratio of the dielectric constant of the medium to the dielectric constant of vacuum.

[0038] Furthermore, the logarithmic spiral antenna body is a thin metal layer structure. Specifically, the logarithmic spiral antenna body is printed from copper foil, which is directly printed on the top wall of the cylindrical dielectric lens 2, resulting in a simple overall antenna structure.

[0039] After constructing the basic antenna structure, the terahertz ultra-wideband lens antenna provided in this embodiment is tested in a practical application environment. The debugging method is well known to those skilled in the art and will not be described in detail here.

[0040] The test performance of the terahertz ultra-wideband lens antenna after commissioning is as follows: Figures 3-5 As shown, from Figure 3 As can be seen from the return loss, the terahertz ultra-wideband lens antenna operates in the 200GHz-1000GHz frequency range, exhibiting ultra-wideband capability; from Figure 4As can be seen, the terahertz ultra-wideband lens antenna achieves an efficiency greater than 70% in the 200GHz-1000GHz frequency band, meeting the expected performance targets and demonstrating excellent spatial coverage capabilities, thus achieving superior radiation performance. Figure 5 As can be seen, the dielectric lens focuses the radiation beam of the logarithmic spiral antenna body, thus orienting the radiation direction of the terahertz ultra-wideband lens antenna.

[0041] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit the scope of protection of the utility model.

Claims

1. A terahertz ultra-wideband lens antenna, characterized by, The logarithmic spiral antenna body and the dielectric lens, the dielectric lens comprising a hemispherical dielectric lens and a cylindrical dielectric lens, the radius of the cylindrical dielectric lens being equal to the radius of the hemispherical dielectric lens, the bottom wall of the cylindrical dielectric lens being attached to the plane wall of the hemispherical dielectric lens, the logarithmic spiral antenna body being arranged on the top wall of the cylindrical dielectric lens.

2. The terahertz ultra-wideband lens antenna according to claim 1, characterized in that, The height of the cylindrical dielectric lens is 150 um.

3. The terahertz ultra-wideband lens antenna according to claim 2, characterized in that, The radius of the cylindrical dielectric lens is equal to the radius of the hemispherical dielectric lens, both being 300 um.

4. The terahertz ultra-wideband lens antenna according to claim 3, characterized in that, The logarithmic spiral antenna body comprises a first spiral arm and a second spiral arm, the distance between the outer side wall of the end of the first spiral arm and the outer side wall of the end of the second spiral arm being 286 um.

5. The terahertz ultra-wideband lens antenna according to claim 4, characterized in that, The working frequency band of the logarithmic spiral antenna body covers 200 GHz-1000 GHz.

6. The terahertz ultra-wideband lens antenna according to claim 4, wherein, The first spiral arm is formed by closing two equiangular spiral lines, the number of spiral turns of the first spiral arm being two circumferences, the first spiral arm rotating 180° in the plane to form the second spiral arm.

7. The terahertz ultra-wideband lens antenna according to claim 6, characterized in that, The center of rotation of the first spiral arm is the center of the cylindrical dielectric lens.

8. The terahertz ultra-wideband lens antenna according to any one of claims 1-4, wherein, The hemispherical dielectric lens and the cylindrical dielectric lens are both silicon lenses.

9. The terahertz ultra-wideband lens antenna according to claim 8, characterized in that, The dielectric constant of the hemispherical dielectric lens and the cylindrical dielectric lens is both 11.

7.

10. The lens antenna according to claim 1, wherein, The logarithmic spiral antenna body is a metal thin layer structure.

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