THz dual-frequency transmitarray antenna

Abstract

The application relates to the technical field of wireless communication and discloses a THz dual-frequency transmissive array antenna, which comprises a feed source and a transmissive component, the transmissive component comprises a dielectric substrate with a metal layer on one side surface, the metal layer is provided with a first transmissive array and a second transmissive array formed by a plurality of through holes; the first transmissive array comprises M*N first transmissive units composed of cross holes, is used for transmitting first-band electromagnetic waves, and the length L of the first transmissive unit can be adjusted to make the first transmissive unit produce a preset phase compensation value for the first-band electromagnetic waves; the second transmissive array comprises m*n second transmissive units composed of concentric circular holes and circular ring holes, is used for transmitting second-band electromagnetic waves, and the radius r of the circular hole can be adjusted to make the second transmissive unit produce a preset phase compensation value for the second-band electromagnetic waves; the first transmissive units and the second transmissive units are staggered and arranged on the dielectric substrate. By adjusting the phase compensation values of the transmissive units, the deflection of the transmitted electromagnetic waves can be produced, so that the required beam shape is achieved.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, specifically to a THz dual-frequency transmission array antenna. Background Technology

[0002] The development of next-generation wireless communication systems is no longer limited to terrestrial communication; integrated air-space-ground communication has become an inevitable trend, with 6G technology playing an indispensable role in this process. Compared to lower-frequency satellite communications such as the X-band and Ku-band, 6G THz communication is attracting increasing attention due to its advantages such as wide bandwidth, high gain, and small size. High-gain and multi-beam antennas have attracted researchers' attention due to their practical value in communication applications and radar systems, and in recent years, many high-gain and multi-beam antennas based on metasurfaces have emerged. Currently, most research focuses on single-band high-gain transmission array antennas, but the frequency bands and functions that can be achieved are often limited. Therefore, THz transmission arrays typically require antennas with multi-band and multi-functional characteristics. Thus, designing dual-band multi-functional antennas that meet the requirements of the THz band has become an inevitable trend. Summary of the Invention

[0003] The purpose of this invention is to provide a THz dual-frequency transmission array antenna, wherein the transmission component can deflect the phase of electromagnetic waves in two frequency bands emitted by the feed. By adjusting the phase compensation value of each transmission unit in the transmission component, the electromagnetic waves of the transmitted radio frequency band can be deflected to achieve the desired beam shape.

[0004] To achieve the above objectives, the present invention provides a THz dual-band transmission array antenna, including a feed source and a transmission component. The transmission component includes a dielectric substrate with a metal layer on one side surface. The metal layer has a first transmission array and a second transmission array formed by a plurality of through holes. The first transmission array includes M×N periodically arranged first transmission elements composed of cross-shaped holes, used to transmit electromagnetic waves of a first frequency band emitted by the feed source. Adjusting the length L of each first transmission element can cause the first transmission element to generate a preset phase compensation value for the electromagnetic waves of the first frequency band. The second transmission array includes m×n periodically arranged second transmission elements, used to transmit electromagnetic waves of a second frequency band emitted by the feed source. The second transmission element includes concentric circular holes and annular holes. Adjusting the radius r of each circular hole can cause the second transmission element to generate a preset phase compensation value for the electromagnetic waves of the second frequency band. The first transmission elements and the second transmission elements are staggered on the dielectric substrate.

[0005] Preferably, each end of the cross-shaped hole is provided with an arc-shaped hole.

[0006] Preferably, the transmission component includes four dielectric substrates, each dielectric substrate having a first transmission array and a second transmission array facing each other, the spacing between adjacent dielectric substrates being D, where D = λ0 / 2; λ0 is the wavelength corresponding to the center frequency electromagnetic wave of the higher frequency band in the first and second frequency bands; the phase compensation value for the transmitted first frequency band electromagnetic wave after the first transmission units facing each other in the four dielectric substrates are superimposed is P1, and the relationship between P1 and L is: P1 = a1 sin(b1L + c1); the phase compensation value for the transmitted second frequency band electromagnetic wave after the second transmission units facing each other in the four dielectric substrates are superimposed is P2, and the relationship between P2 and r is P2 = d1r + e1; where a1∈(323,526), ​​b1∈(0.004,0.01), c1∈(13.8,18.6), d1∈(-3,-2.3), e1∈(410.7,530.3), and the units of L and r are both μm.

[0007] Preferably, a1 = 424, b1 = 0.007, c1 = 16.2, d1 = -2.66, e1 = 470.5.

[0008] Preferably, the transmission component includes three dielectric substrates, each dielectric substrate having a first transmission array and a second transmission array facing each other, the spacing between adjacent dielectric substrates being D, where D = λ0 / 2; λ0 is the wavelength corresponding to the center frequency electromagnetic wave of the high-frequency band in the first and second frequency bands; the phase compensation value for the transmitted first frequency band electromagnetic wave after the first transmission units facing each other in the three dielectric substrates are superimposed is P3, and the relationship between P3 and L is: P3 = a²sin(b²L + c²); the phase compensation value for the transmitted second frequency band electromagnetic wave after the second transmission units facing each other in the three dielectric substrates are superimposed is P4, and the relationship between P4 and r is: P4 = d²r + e²; where a² = 401.5, b² = 0.004, c² = 18.5, d² = -1.7, e² = 55.3, and the units of W and r are both μm.

[0009] Preferably, the angle of the electromagnetic wave transmitted from the end of each transmission unit of the transmission assembly is . Its relationship with the phase compensation value P of each transmission unit is as follows:

[0010]

[0011]

[0012] In the formula, (x0, y0, z0) are the coordinates of the feed source, (x i ,y j Let d be the coordinates of the transmission unit in the i-th row and j-th column. ijThe distance between each of the transmission elements and the feed source is k0 = 2π / λ C θ is the pitch angle. It is the azimuth angle.

[0013] Preferably, for the first transmission array, θ = 0. For the second transmission array, θ = ±20°.

[0014] Preferably, the first transmission array is used to transmit electromagnetic waves in the 90GHz band; the second transmission array is used to transmit electromagnetic waves in the 140GHz band.

[0015] Preferably, M = N = m = n = 21.

[0016] Preferably, the focal diameter ratio of the antenna is 0.85.

[0017] Based on the above description and practice, the THz dual-frequency transmission array antenna of the present invention radiates electromagnetic waves of two different frequency bands by setting two transmission arrays in the transmission component. Under the premise that the position of the feed source and the position of each transmission element are determined, the phase compensation value of the transmitted electromagnetic wave can be adjusted by adjusting the size of the transmission element in each transmission array. Thus, the electromagnetic wave with the required beam shape can be formed by the transmission array to be suitable for different application scenarios. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a THz dual-frequency transmission array antenna according to one embodiment of the present invention.

[0019] Figure 2 This is a distribution diagram of the first and second transmission arrays on the dielectric substrate of a THz dual-frequency transmission array antenna according to one embodiment of the present invention.

[0020] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0021] Figure 4 This is a diagram showing the relationship between the phase compensation value of the transmitted electromagnetic waves and its own length L for the four opposing first transmission elements on the four dielectric substrates of a THz dual-frequency transmission array antenna in one embodiment of the present invention.

[0022] Figure 5 This is a diagram showing the relationship between the phase compensation value of the transmitted electromagnetic waves and the radius r of the circular aperture of the four opposing second transmission elements on the four dielectric substrates of a THz dual-frequency transmission array antenna in one embodiment of the present invention.

[0023] Figure 6This is a transmission coefficient diagram of a THz dual-frequency transmission array antenna at different frequencies, according to one embodiment of the present invention.

[0024] Figure 7 This is a peak gain diagram of a THz dual-frequency transmission array antenna at different frequencies, according to one embodiment of the present invention.

[0025] Figure 8 This is the radiation pattern of a THz dual-frequency transmission array antenna at 90GHz in one embodiment of the present invention.

[0026] Figure 9 This is the radiation pattern of a THz dual-frequency transmission array antenna at 140 GHz in one embodiment of the present invention.

[0027] The attached figures are labeled as follows:

[0028] 1. Feed source; 2. Transmission component; 31. First transmission unit; 32. Second transmission unit; 41. Cross hole; 42. Arc hole; 43. Circular hole; 44. Circular hole; 5. Dielectric substrate; 6. Metal layer. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0030] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not 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 the invention.

[0031] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] This embodiment discloses a THz dual-frequency transmission array antenna. Figure 1 The three-dimensional structure of the THz dual-frequency transmission array antenna is shown. Figure 2 The diagram shows a top view of the dielectric substrate of the THz dual-frequency transmission array antenna, which includes the distribution of the first and second transmission arrays. Figure 3 It shows Figure 2 The magnified structure in section A shows in detail the specific structures of the first and second transmission arrays.

[0033] Please refer to Figures 1-3 The THz dual-frequency transmission array antenna in this embodiment includes a feed source 1 and a transmission component 2, with the transmitting end of the feed source 1 facing the center of the transmission component 2. The transmission component 2 includes a dielectric substrate 5 with a metal layer 6 on one side surface, and a first transmission array and a second transmission array formed by a plurality of through holes on the metal layer 6, which are used to transmit electromagnetic waves of different frequency bands, respectively.

[0034] The first transmission array comprises M×N periodically arranged first transmission elements 31. Each first transmission element 31 is a cross-shaped aperture 41 penetrating the aforementioned metal layer 6, used to transmit electromagnetic waves of the first frequency band emitted by the feed source 1 and to generate a certain phase compensation value for the first frequency band electromagnetic waves. The length of the first transmission element 31 is L, that is, the cross-shaped aperture 41 is located at... Figure 3 The horizontal and vertical lengths of the cross-shaped aperture 41 are L; the width of the first transmission unit 31 body is W0, i.e., the aperture width of the cross-shaped aperture 41 is W0. The value of W0 is a preset fixed value, meaning that the width of each first transmission unit 31 body is the same. The value range depends on the frequency of the transmitted electromagnetic wave, and can be specifically selected between 0.1mm and 0.2mm according to actual needs. In this embodiment, W0 = 0.12mm. Adjusting the L value of each first transmission unit 31 can cause the first transmission unit 31 to generate a preset phase compensation value for the first frequency band electromagnetic wave. In other words, the phase compensation value for the first frequency band electromagnetic wave can be adjusted by controlling the size of the cross-shaped aperture 41. Then, M×N first transmission units 31 can form an array. By controlling the phase compensation value of different units in the array, the electromagnetic wave passing through it can be deflected at the required angle to form a transmission beam of the desired shape.

[0035] The second transmission array includes m×n periodically arranged second transmission units 32, used to transmit second-band electromagnetic waves emitted by the feed source 1 and generate a certain phase compensation value for the second-band electromagnetic waves. Each first transmission unit 31 includes a concentric circular hole 44 and an annular hole 43, both of which penetrate the aforementioned metal layer 6. The outer diameter of the annular hole 43 is a preset fixed value R0, and the distance between the circular hole 44 and the annular hole 43 is a preset fixed value L0, that is, R0 and L0 are fixed in each second transmission unit 32. The range of values ​​for R0 and L0 depends on the frequency of the transmitted electromagnetic waves. Specifically, R0 can be between 0.5mm and 1mm, and L0 can be between 0.05mm and 0.1mm, depending on actual needs. In this embodiment, R0 = 0.64mm and L0 = 0.08mm. The radius of the circular aperture 44 is r. By adjusting the value of r of each second transmission unit 32, the second transmission unit 32 can generate a preset phase compensation value for the second frequency band electromagnetic wave. In other words, the phase compensation value of the second transmission unit 32 for the second frequency band electromagnetic wave can be adjusted by controlling the size of the circular aperture 44. Subsequently, m×n second transmission units 32 can be arranged into an array. By controlling the phase compensation value of different units in the array, the electromagnetic wave passing through it can be deflected at the required angle to form a transmission beam of the desired shape.

[0036] In this embodiment, the first transmission units 31 and the second transmission units 32 are staggered on the dielectric substrate 5, and the transmitting end of the feed source 1 faces the center of the transmission component 2. Therefore, the electromagnetic waves emitted by the feed source 1 can radiate mostly onto the first transmission array and the second transmission array, thereby achieving the corresponding beam shift as required.

[0037] Since the positions of the feed 1, the first transmission elements 31, and the second transmission elements 32 are fixed, the incident phase of the electromagnetic wave emitted by the feed 1 to each transmission element is fixed. Therefore, by changing the phase compensation value of the transmitted electromagnetic wave located in each transmission element, the desired phase of the transmitted electromagnetic wave can be obtained. That is, by controlling the phase compensation value of each transmission element, the desired shape of the transmitted beam can be obtained. For transmission arrays with beam-focusing effects, the signal strength can be improved within a certain range. Furthermore, the antenna uses two staggered transmission arrays to radiate electromagnetic waves in two different frequency bands, producing a beam shifting effect for both frequency bands. The basic structure of the antenna is given above. In practical applications, the above parameters can be adjusted in a timely manner according to the required beam shift angle to achieve the best radiation effect.

[0038] Furthermore, in this embodiment, an arc-shaped hole 42 is provided at each end of each cross hole 41. On the one hand, this can improve the transmission coefficient of the first transmission array to the first frequency band electromagnetic waves, so as to transmit more electromagnetic waves and achieve better transmission effect; on the other hand, it can also improve the phase compensation value of a single first transmission unit 31 to the first frequency band electromagnetic waves, and a wider range of phase compensation values ​​can be obtained when adjusting the L value.

[0039] Specifically, in this embodiment, the transmission component 2 includes four dielectric substrates 5. Each dielectric substrate 5 is provided with a first transmission array and a second transmission array. The first transmission arrays on adjacent dielectric substrates 5 are arranged facing each other, and the second transmission arrays on adjacent dielectric substrates 5 are also arranged facing each other. That is, the four opposing transmission units in the four dielectric substrates 5 have the same shape and size. The first transmission array is used to transmit electromagnetic waves in the 90GHz frequency band, and the second transmission array is used to transmit electromagnetic waves in the 140GHz frequency band. The four opposing transmission units can form a transmission cell. By adjusting the size of each transmission unit, this type of transmission cell can achieve a phase compensation range of more than 360° for electromagnetic waves. For example, by simultaneously adjusting the L value of the four opposing first transmission units 31, a phase compensation value of more than 360° can be generated for the first frequency band electromagnetic wave signal, thus enabling transmission beams of single-beam, dual-beam, and four-beam shapes. Similarly, by simultaneously adjusting the r values ​​of the four opposing second transmission units 32, a phase compensation value of more than 360° can be generated for the second frequency band electromagnetic wave signal, thus enabling transmission beams of single-beam, dual-beam, and four-beam shapes.

[0040] Specifically, the spacing between two adjacent dielectric substrates 5 is D, where D = λ0 / 2; λ0 is the wavelength corresponding to the center frequency electromagnetic wave of the higher frequency band in the first and second frequency bands. The phase compensation value of the first transmission unit 31 for the transmitted first frequency band electromagnetic wave is P1, and the relationship between P1 and L is: P1 = a1 sin(b1L + c1); the phase compensation value of the second transmission unit 32 for the transmitted second frequency band electromagnetic wave is P2, and the relationship between P2 and r is P2 = d1r + e1; where a1∈(323,526), ​​b1∈(0.004,0.01), c1∈(13.8,18.6), d1∈(-3,-2.3), e1∈(410.7,530.3), and the units of L and r are both μm, with L ranging from 820μm to 960μm and r ranging from 120μm to 220μm. Meanwhile, the range of values ​​for a1, b1, c1, d1, and e1 is given above. Within this range, the error of P1 under the same L value will not exceed 5%, and the error of P2 under the same r value will not exceed 5%.

[0041] In this embodiment, a1 = 424, b1 = 0.007, c1 = 16.2, d1 = -2.66, e1 = 470.5, and correspondingly, Figure 4 The diagram illustrates the relationship between P1 and L for different values ​​of r, where the vertical axis represents the phase compensation value P1. It shows that the relationship between P1 and L remains essentially the same as r changes, meaning that changes in the size of the second transmission unit 32 do not significantly affect the phase compensation value of the first transmission unit 31. Furthermore, within the aforementioned value range, L ensures that the first transmission unit 31 achieves a phase compensation value exceeding 360° for the transmitted electromagnetic waves. Figure 5 The diagram illustrates the relationship between P2 and r for different values ​​of L, where the vertical axis represents the phase compensation value P2. It shows that the relationship between P2 and r remains essentially the same as L changes, meaning that changes in the size of the first transmission unit 31 do not significantly affect the phase compensation value of the second transmission unit 32. Furthermore, within the aforementioned range of r values, it can be ensured that the second transmission unit 32 achieves a phase compensation value exceeding 360° for the transmitted electromagnetic wave. Therefore, the first transmission unit 31 and the second transmission unit 32 possess a high degree of independence, and each can generate a phase compensation value exceeding 360° for the transmitted radio frequency band of electromagnetic waves. This facilitates the formation of a transmission array, thereby achieving the transmission of electromagnetic waves with the desired beam shape, making it suitable for various application scenarios.

[0042] After determining the required phase compensation value for a first transmission element 31, the specific length L of the first transmission element 31 can be calculated using the formula P1 = a1 sin(b1L + c1). After determining the required phase compensation value for a second transmission element 32, the specific radius r of the circular aperture 44 in the second transmission element 32 can be calculated using the formula P2 = d1r + e1. During antenna design, the positions of each transmission element and the incident angle of the electromagnetic wave incident on them are known. For electromagnetic waves with a specific shape of transmission beam, the transmission angle of each transmission element is also fixed. Therefore, the required phase compensation value for each transmission element can be calculated according to the requirements. Thus, after determining the phase compensation value for each transmission element, the values ​​of L and r can be calculated using the formulas P1 = a1 sin(b1L + c1) and P2 = d1r + e1.

[0043] Furthermore, when the value of W0 remains constant, the value of P1 is only related to L; when the values ​​of R0 and L0 remain constant, the value of P2 is only related to r. Therefore, this application only provides the value ranges of W0, R0, and L0. In practical applications, the specific values ​​of these parameters can be set within the above value ranges based on known parameters such as antenna size and the number of transmission elements.

[0044] Furthermore, in this embodiment, a formula for calculating the phase compensation value P of each transmission unit is also provided. Here, P represents the phase compensation value of each first transmission unit 31 and each second transmission unit 32, meaning that the formula applies to both the first transmission unit 31 and the second transmission unit 32. This phase compensation value P is related to the angle between the phase compensation value P and the electromagnetic wave transmitted from the end of each transmission unit. Related. Specifically,

[0045]

[0046]

[0047] In the formula, (x0, y0, z0) are the coordinates of feed source 1, (x i ,y j Let ) represent the coordinates of the transmission element in the i-th row and j-th column, and d ij Let Z be the distance between each transmission unit and feed 1. To simplify the calculation, the plane where each transmission unit is located is set as the plane with Z=0 in the spatial coordinate system. The angle of the electromagnetic waves transmitted by each of the first transmission unit 31 and the second transmission unit 32, when the required beam shape is determined. Also a fixed value. Where θ is the pitch angle, The azimuth angle is k0 = 2π / λ. C , λ C λ is the wavelength of the electromagnetic wave at the operating frequency. For the first transmission unit 31, λ C The wavelength of an electromagnetic wave with a frequency of 90 GHz; for the second transmission unit 3242, λ C Let i be the wavelength of an electromagnetic wave with a frequency of 140 GHz. i and j are natural numbers greater than 0. For the first transmission array, i ≤ M, j ≤ N. For the second transmission array, i ≤ m, j ≤ n.

[0048] Furthermore, in this embodiment, the first transmission array is designed to transmit electromagnetic waves in a focused single-beam shape, which can improve the signal strength in a local area and achieve better point-to-point communication. The transmission angle of each of its first transmission units 31 is... Where: θ = 0°, Based on this, the L value in each of the first transmission elements 31 can be calculated. The second transmission array is designed to transmit electromagnetic waves in a dual-beam shape, which can be used for point-to-many communication. The transmission angle of each of its second transmission elements 32 is... Where: θ=±20°, Based on this, the r value in each of the second transmission units 32 can be calculated.

[0049] More specifically, in this embodiment, M = N = 20, and m = n = 20. That is, each first transmission array has 20 rows and 20 columns of first transmission elements 31; each second transmission array has 20 rows and 20 columns of second transmission elements 32. Furthermore, in this embodiment, each second transmission element 32 is located in the middle of four adjacent first transmission elements 31, and the first transmission elements 31 in each row and the second transmission elements 32 in adjacent rows are not on the same straight line, nor are the first transmission elements 31 in each column and the second transmission elements 32 in adjacent columns on the same straight line. This structural form allows for the arrangement of a large number of transmission elements on a relatively small area of ​​dielectric substrate 5, while also maintaining low mutual coupling between adjacent transmission elements. In other embodiments, the number of first transmission elements 31 and second transmission elements 32 can be changed according to the predetermined antenna size, achieving the same effect.

[0050] Please see Figure 6 The diagram shows the transmission coefficients of this THz dual-frequency transmission array antenna for electromagnetic waves of different frequencies. It can be seen that its transmission coefficients are higher than -2dB in both the 90GHz and 140GHz frequency bands, indicating low signal transmission loss. Figure 7 The peak gain of the antenna at different frequencies is shown. It can be seen that its peak gain is higher than 18.5 dBi in the 90 GHz band and higher than 24.5 dBi in the 140 GHz band. The 1-dB gain is around 9% in both bands, exhibiting a wide bandwidth. In other words, the antenna achieves both low loss and high gain with a wide bandwidth.

[0051] Figure 8 The radiation pattern of the antenna at 90 GHz is shown. Figure 9 The radiation pattern of the antenna at 140 GHz is shown, which shows that the antenna achieves good focusing and dual-beam performance in both frequency bands.

[0052] In another embodiment, the transmission component 2 includes three dielectric substrates 5, each with a first transmission array and a second transmission array. The first transmission arrays on adjacent dielectric substrates 5 face each other, and the second transmission arrays on adjacent dielectric substrates 5 also face each other. That is, the four opposing transmission units on the four dielectric substrates 5 have the same shape and size. The first transmission array is used to transmit electromagnetic waves in the 90GHz band, and the second transmission array is used to transmit electromagnetic waves in the 140GHz band. When these three transmission units are combined and their dimensions are adjusted, a phase compensation range of approximately 200° for the electromagnetic waves can be achieved, thus producing a certain angular correction for the electromagnetic waves and ultimately achieving the desired beam shape.

[0053] Specifically, the spacing between two adjacent dielectric substrates 5 is D, where D = λ0 / 2; λ0 is the wavelength corresponding to the center frequency electromagnetic wave of the high-frequency band in the first and second frequency bands. The phase compensation value of the first transmission unit 31 for the transmitted first frequency band electromagnetic wave is P3, and the relationship between P3 and L is: P3 = a2 sin(b2L + c2); the phase compensation value of the second transmission unit 32 for the transmitted second frequency band electromagnetic wave is P4, and the relationship between P4 and r is P4 = d2r + e2; where a2 = 401.5, b2 = 0.004, c2 = 18.5, d2 = -1.7, e2 = 55.3, and the units of L and r are both μm, with L ranging from 820μm to 960μm and r ranging from 120μm to 220μm.

[0054] In other words, when the angular deflection of electromagnetic waves is small, only a small number of dielectric substrates 5 and their transmission units are needed to achieve the corresponding phase compensation value. Therefore, the number of dielectric substrates 5 and transmission units in the above-mentioned transmission component 2 can be appropriately reduced to achieve the corresponding function at the lowest cost.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A THz dual-frequency transmissive array antenna, characterized in that, The THz dual-frequency transmissive array antenna comprises a feed source and a transmissive component, the transmissive component comprises a dielectric substrate with a metal layer on one side surface, and a first transmissive array and a second transmissive array formed by a plurality of through holes on the metal layer; the first transmissive array is used for transmitting electromagnetic waves in a 90 GHz frequency band; and the second transmissive array is used for transmitting electromagnetic waves in a 140 GHz frequency band. The first transmissive array comprises M*N first transmissive units arranged periodically and formed by cross holes, is used for transmitting electromagnetic waves in the first frequency band, and adjusting the length L of each first transmissive unit can make the first transmissive unit produce a preset phase compensation value for the electromagnetic waves in the first frequency band. The second transmissive array comprises m*n second transmissive units arranged periodically and used for transmitting electromagnetic waves in the second frequency band, each second transmissive unit comprises a concentric circular hole and a circular ring hole, and adjusting the radius r of each circular hole can make the second transmissive unit produce a preset phase compensation value for the electromagnetic waves in the second frequency band. The first transmissive units and the second transmissive units are arranged alternately on the dielectric substrate; the transmissive component comprises four dielectric substrates, each dielectric substrate is provided with the first transmissive array and the second transmissive array facing each other; four facing transmissive units form a transmissive unit cell, and when the size of each transmissive unit is adjusted, the transmissive unit cell can realize phase compensation of electromagnetic waves exceeding 360°.

2. The THz dual-frequency transmissive array antenna of claim 1, wherein Each end of the cross hole is provided with an arc-shaped hole.

3. The THz dual-frequency transmissive array antenna of claim 1, wherein The distance between adjacent dielectric substrates is D, and D = λ0 / 2; λ0 is the wavelength corresponding to the center frequency electromagnetic wave of the higher frequency band of the first frequency band and the second frequency band; The phase compensation value of the first transmissive units of the four dielectric substrates facing each other after superposition for the transmitted electromagnetic waves in the first frequency band is P1, and the relationship between P1 and L is P1 = a1sin(b1L + c1); The phase compensation value of the second transmissive units of the four dielectric substrates facing each other after superposition for the transmitted electromagnetic waves in the second frequency band is P2, and the relationship between P2 and r is P2 = d1r + e1; In the formula, a1 ∈ (323, 526), b1 ∈ (0.004, 0.01), c1 ∈ (13.8, 18.6), d1 ∈ (-3, -2.3), e1 ∈ (410.7, 530.3), and the units of L and r are both μm.

4. The THz dual-frequency transmissive array antenna of claim 3, wherein a1 = 424, b1 = 0.007, c1 = 16.2, d1 = -2.66, and e1 = 470.

5.

5. The THz dual-frequency transmissive array antenna of any one of claims 1-4, wherein The angle of the electromagnetic wave transmitted by each of the transmission units of the transmission assembly is (θ, ), which has a relationship with the phase compensation value P of each of the transmission units as follows: where (x0, y0, z0) is the coordinate of the feed, (x i , y j ) is the coordinate of the transmission unit in the i-th row and j-th column, d ij is the distance from the transmission unit to the feed, k0=2π / λ C , θ is the elevation angle, is the azimuth angle.

6. The THz dual-frequency transmissive array antenna of claim 5, wherein For the first transmitting array, θ = 0, For the second transmission array, θ = ±20, 7. The THz dual-frequency transmissive array antenna of claim 5, wherein M = N = m = n = 21.

8. The THz dual-frequency transmissive array antenna of claim 5, wherein The focal ratio of the antenna is 0.

85. The focal ratio of the antenna is 0.85.

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