An antenna device for an electronic device

Abstract

The invention provides an antenna arrangement (1) for an electronic device (2), the antenna arrangement comprising: an antenna array (3) comprising a plurality of antenna elements (4) generating millimeter wave frequency radiation; at least one radiation reflecting surface (5) at least partially overlapping the antenna array (3) and configured to reflect at least a portion of the millimeter wave frequency radiation in at least one direction. The reflecting surface (5) comprises at least one of: a non-conductive reflector unit (5a) comprising a material having a dielectric constant of at least 10; a plurality of parallel elongated conductive reflectors (5b). Each pair of parallel elongated conductive reflectors (5b) is separated by an elongated gap (6) filled with a dielectric solid or air. The reflecting surface (5) can be embedded in a display panel (7), a frame (8) or a substrate (9) of the electronic device (2).

Description

Technical Field

[0001] The present invention relates to an antenna device for an electronic device, the antenna device comprising at least one radiating reflector and an antenna array, the antenna array comprising a plurality of antenna elements arranged along the antenna array axis and used to generate millimeter wave frequency radiation in a direction perpendicular to the antenna array axis. Background Technology

[0002] Mobile devices such as smartphones require fully covered dual-polarization millimeter-wave antennas to achieve stable communication in all directions and orientations. However, the design requirements for these devices include a curved design featuring a smooth metal frame and a large display with very small gaps, ideally without any visible openings. These design requirements conflict with antenna requirements, making it difficult to achieve both a contemporary design and sufficient antenna coverage in a single device.

[0003] Millimeter-wave antennas require display-side radiation. For millimeter-wave radiation, antennas in the form of dipoles or monopoles are typically used. These elements provide an omnidirectional radiation pattern; however, they can cause energy leakage or radiation in undesired directions (e.g., away from the display side of the device). Therefore, millimeter-wave antennas require reflectors to reflect and redirect radiation from undesired directions to desired directions. However, such reflectors can interfere with the performance of antenna components outside the millimeter-wave range—e.g., feed pillars below 6 GHz.

[0004] In at least one known approach, a dielectric rod antenna is used to generate radiation toward the display side of the device. However, dielectric rod antennas require a significant amount of free space to be used within the device, and this approach is generally incompatible with feed pillars below 6 GHz. Furthermore, this approach requires multiple device layers with different permittivity (i.e., dielectric constant) and notches in the display.

[0005] In another known approach, high-impedance surface spikes are added to the metal frame. This allows modification of the radiation pattern to enhance directivity towards the display side. However, the spikes can intersect with feed pillars below 6 GHz, increasing the difficulty of implementation. Furthermore, the incompatibility of the feed pillars negatively impacts performance, at least below 6 GHz.

[0006] Therefore, a solution is needed that can provide good end-fire performance and directionality for devices with metal frames and curved displays. Summary of the Invention

[0007] The object of this invention is to provide an improved antenna device for handheld devices. The above and other objects are achieved through the features of the independent claims. Other implementations will be apparent from the dependent claims, the description, and the drawings.

[0008] According to a first aspect, an antenna device for an electronic device is provided, the antenna device comprising: an antenna array including a plurality of antenna elements arranged along an antenna array axis and used to generate millimeter-wave frequency radiation in a direction perpendicular to the antenna array axis; at least one radiation reflecting surface at least partially overlapping the antenna array and extending parallel to the antenna array axis, the reflecting surface being used to reflect at least a portion of the millimeter-wave frequency radiation in at least one of the directions. The reflecting surface includes at least one of: a non-conductive reflector element comprising a material with a dielectric constant of at least 10; a plurality of parallel elongated conductive reflectors, wherein each pair of the parallel elongated conductive reflectors is separated by an elongated gap, the longitudinal axis of the parallel reflectors and the longitudinal axis of the gap extending perpendicular to the antenna array axis, the gap being filled with a dielectric solid or air.

[0009] This approach enables the redirection of millimeter-wave frequency radiation using a reflector that can be positioned closer to the millimeter-wave antenna element, maintaining a greater distance than conventional solutions between the reflector and other antenna signal elements (e.g., feed pillars below 6 GHz). This antenna device offers a highly efficient radiation field with full coverage while freeing up internal space for components such as batteries. Furthermore, the antenna device can be used with highly curved display elements because the reflector provides the correct radiation redirection regardless of the distance involved. The use of non-conductive reflector units eliminates the need for grounding, while the use of multiple parallel, elongated conductive reflectors facilitates planar implementations.

[0010] In one possible implementation of the first aspect, the longitudinal axis extends within the main plane of the reflective surface, for example, by providing a reflective surface that is as thin as possible.

[0011] In another possible implementation of the first aspect, at least one of the antenna elements is an end-fire antenna element, wherein the end-fire antenna element is used to generate millimeter-wave frequency radiation having a main beam direction, a first polarization, and a second polarization, the first polarization extending perpendicular to the main beam direction, and the reflecting surface is used to reflect the millimeter-wave frequency radiation having the first polarization. This can improve the radiation having the first polarization without affecting or reducing the radiation having the second polarization.

[0012] In another possible implementation of the first aspect, the antenna device includes multiple reflective surfaces for reflecting the millimeter-wave frequency radiation in different directions, providing the device with maximum flexibility and adaptability.

[0013] In another possible implementation of the first aspect, the reflective surface is positioned at a distance ≤λ / 2 from the antenna element, where λ is the wavelength of the millimeter-wave frequency radiation. By placing the reflective surface close to the antenna element, the overall required volume is reduced, increasing design freedom.

[0014] In another possible implementation of the first aspect, the reflective surface is positioned at a distance between λ / 4 and λ / 10 from the antenna element. By placing the reflective surface close to the antenna element, the overall required volume is reduced, increasing design freedom.

[0015] In another possible implementation of the first aspect, the reflective surface is disposed in the near-field region of the antenna element, wherein, D is the maximum external dimension of the antenna element, which ensures sufficient antenna performance while still providing a very compact antenna assembly.

[0016] In another possible implementation of the first aspect, the reflector forms an impedance discontinuity in the antenna device, reflecting radiation such that it complementarily increases in the desired radiation direction.

[0017] In another possible implementation of the first aspect, the non-conductive reflector unit comprises a ceramic or plastic material capable of compensating for the dielectric constant to ensure robustness and manufacturability.

[0018] In another possible implementation of the first aspect, the non-conductive reflector unit has a thickness in a direction perpendicular to the main plane of the reflector unit, wherein the thickness is ≤λ / 4, where λ is the wavelength of the millimeter-wave frequency radiation, which has the maximum radiation reflection while avoiding parasitic resonance.

[0019] In another possible implementation of the first aspect, the thickness is between λ / 8 and 3λ / 8, which is conducive to maximizing reflectivity.

[0020] In another possible implementation of the first aspect, the non-conductive reflector unit has a thickness in a direction perpendicular to the main plane of the reflector unit, wherein the thickness is an odd multiple of λ / 4, which is beneficial for maximizing reflectivity.

[0021] In another possible implementation of the first aspect, the thickness is ≤1mm, and the antenna device is as thin as possible.

[0022] In another possible implementation of the first aspect, the conductive reflector and the gap separating the plurality of parallel reflectors are formed in a single conductive sheet, which facilitates a simplified manufacturing process.

[0023] In another possible implementation of the first aspect, the length of the reflective surface in the direction perpendicular to the axis of the antenna array is between λ and λ / 10, where λ is the wavelength of the millimeter-wave frequency radiation. This ensures the end-fire radiation direction and helps to avoid parasitic resonances.

[0024] In another possible implementation of the first aspect, the lengths of the conductive reflector and the gap along the longitudinal axis range between λ and λ / 10, where λ is the wavelength of the millimeter-wave frequency radiation. This ensures the end-radiated direction and helps avoid parasitic resonances.

[0025] In another possible implementation of the first aspect, the gaps separating the plurality of pairs of parallel reflectors allow millimeter-wave frequency radiation with the first polarization to propagate between adjacent pairs of parallel reflectors.

[0026] In another possible implementation of the first aspect, the propagation of millimeter-wave frequency radiation with the second polarization is unaffected by the reflecting surface.

[0027] According to a second aspect, an electronic device is provided, the electronic device comprising: a display panel; a frame; a substrate, wherein the substrate is at least surrounded by the display panel and the frame; and an antenna device according to the above, wherein the antenna device is configured to emit millimeter-wave frequency radiation having a first polarization propagating toward the display panel and to emit a second polarization propagating toward the frame, the antenna device also being configured to reflect at least a portion of the millimeter-wave frequency radiation having the first polarization.

[0028] This allows for improved antenna coverage in electronic devices because a reflector can be used to redirect millimeter-wave frequency radiation. This reflector, positioned closer to the millimeter-wave antenna element, maintains a greater distance than conventional solutions between the reflector and other antenna signal elements (e.g., feed pillars below 6 GHz). This, in turn, allows for a smaller device size for the antenna and eliminates the need for any substantial modifications to existing device designs.

[0029] In one possible implementation of the second aspect, the electronic device further includes at least one antenna, wherein the antenna is used to generate radiation outside the millimeter-wave frequency range, the reflective surface of the antenna device is disposed within the volume of the electronic device, the electronic device includes at least one signal feed probe of the antenna, and the reflective surface is disposed at a certain distance from the signal feed probe, thereby improving the compatibility of the antenna device with non-millimeter-wave antennas and increasing design freedom.

[0030] In another possible implementation of the second aspect, the substrate includes flexible printed circuitry, allowing existing components to be used as carriers for, for example, parts of an antenna device, requiring less modification to the device's framework and occupying less space within the device.

[0031] In another possible implementation of the second aspect, the reflective surface is embedded in the display panel, frame, or substrate, which facilitates assembly and frees up additional space within the device.

[0032] These and other aspects will become apparent from one or more embodiments described below. Attached Figure Description

[0033] In the following detailed description of the invention, aspects, embodiments, and implementations will be explained in more detail with reference to exemplary embodiments shown in the accompanying drawings, in which:

[0034] Figure 1 A side view of an electronic device according to an embodiment of the present invention is shown;

[0035] Figure 2 A partial top view of an electronic device including an antenna arrangement, as shown in an example according to an embodiment of the present invention, is illustrated.

[0036] Figure 3 A cross-sectional view of an electronic device including an antenna device, according to an embodiment of the present invention, is shown;

[0037] Figure 4 A cross-sectional view of an electronic device including an antenna device, according to an embodiment of the present invention, is shown;

[0038] Figure 5 A cross-sectional view of an electronic device including an antenna device, according to an embodiment of the present invention, is shown;

[0039] Figure 6 A cross-sectional view of an electronic device including an antenna device, according to an embodiment of the present invention, is shown;

[0040] Figure 7 A partial perspective view of an electronic device including an antenna arrangement, according to an embodiment of the present invention, is shown.

[0041] Figure 8 A cross-sectional view of an antenna device according to an embodiment of the present invention is shown;

[0042] Figure 9 A partial perspective view of an antenna device according to an embodiment of the present invention is shown. Detailed Implementation

[0043] Figures 3 to 8An antenna device 1 for an electronic device 2 is shown. The antenna device includes: an antenna array 3 comprising a plurality of antenna elements 4 arranged along an antenna array axis A1 and used to generate millimeter-wave frequency radiation in a direction perpendicular to the antenna array axis A1; at least one radiation reflecting surface 5, which at least partially overlaps with the antenna array 3 and extends parallel to the antenna array axis A1. The reflecting surface 5 is used to reflect at least a portion of the millimeter-wave frequency radiation in at least one of the following directions: a non-conductive reflector element 5a comprising a material with a dielectric constant of at least 10. (See [reference needed]). Figures 3 to 7 Multiple parallel, elongated conductive reflectors 5b, each pair of which is separated by an elongated gap 6. The longitudinal axis A2 of the parallel reflectors 5b and the longitudinal axis A3 of the gap 6 extend perpendicularly to the antenna array axis A1. The gap 6 is filled with a dielectric solid or air. See [reference needed]. Figure 8 and Figure 9 .

[0044] Figure 1 and Figure 2 The diagram shows an electronic device 2, which includes: a display panel 7; a frame 8; a substrate 9, which is at least surrounded by the display panel 7 and the frame 8; and an antenna device 1, which will be described in more detail below.

[0045] Frame 8 may include a conductive material. Substrate 9 may include a flexible printed circuit, such as a bent LCP (liquid crystal polymer) plate, as... Figure 8 and 9 As shown. Cutting off a small portion of the plastic material, such as crastin, is sufficient to place the reflector at the optimal distance from the antenna element.

[0046] Antenna device 1 is used to emit millimeter-wave frequency radiation with a first polarization propagating toward display panel 7, and to emit second polarization propagating toward frame 8. Antenna device 1 is also used to reflect at least a portion of the millimeter-wave frequency radiation with the first polarization.

[0047] like Figure 2 As shown, the electronic device 2 may also include at least one antenna 10, which is used to generate radiation outside the millimeter wave frequency range, for example, radiation in the frequency range below 6 GHz.

[0048] The reflective surface 5 of the antenna device 1 is disposed within the volume of the electronic device 2, which includes at least one signal feed probe 11 of the antenna 10. The reflective surface 5 is disposed at a certain distance from the signal feed probe 11.

[0049] This ensures that the antenna device 1 is unaffected by the signal from the feed probe 11.

[0050] The reflective surface 5 can be embedded in the display panel 7, frame 8, or substrate 9, or it can be a separate component applied to the surface of the display panel 7, frame 8, or substrate 9. The reflective surface 5 can be placed between the antenna element 4 and other internal components of the device to prevent radiation leakage to any direction other than the desired direction. The reflective surface 5 can be placed, for example, between the metal of an antenna below 6 GHz and / or under the LCP plate, with the antenna element 4 located above the reflective surface 5.

[0051] Antenna device 1 includes antenna array 3 and at least one radiating reflector 5. Antenna device 1 may include multiple reflectors 5, which are used to reflect millimeter-wave frequency radiation in different directions. Each reflector 5 may create an impedance discontinuity in antenna device 1, thereby causing reflection.

[0052] Antenna array 3 includes multiple antenna elements 4 arranged along antenna array axis A1, such as... Figure 2 As shown, each antenna element 4 includes at least a radiator. The antenna array 3 is used to generate millimeter-wave frequency radiation in a direction perpendicular to the antenna array axis A1.

[0053] At least one of the antenna elements 4 can be an end-fire antenna element 4. The end-fire antenna array is a linear array, wherein the radiation direction is along the line of the antenna, i.e., the main beam direction D0, as shown in the figure. The end-fire antenna element 4 is used to generate millimeter-wave frequency radiation with the main beam direction D0, a first polarization, and a second polarization. The first polarization extends perpendicular to the main beam direction D0, and the reflecting surface 5 is used to reflect the millimeter-wave frequency radiation with the first polarization. The first polarization can be vertical polarization, and the second polarization can be horizontal polarization. A V-pol monopole can be used to generate vertically polarized radiation, and an H-pol dipole can be used to generate horizontally polarized radiation.

[0054] The reflector 5 at least partially overlaps with the antenna array 3 and extends parallel to the antenna array axis A1. The reflector 5 is used to reflect at least a portion of the millimeter-wave frequency radiation in at least one of the directions perpendicular to the antenna array axis A1.

[0055] The reflector 5 can be positioned at a distance ≤λ / 2 from the antenna element 4, where λ is the wavelength of the millimeter-wave frequency radiation. More specifically, the reflector 5 can be positioned at a distance between λ / 4 and λ / 10 from the antenna element 4. The reflector 5 can be positioned in the near-field region of the antenna element 4. D is the maximum external dimension of the antenna element. The maximum external dimension is the largest dimension of the antenna element, such as the length of a radiator with a rectangular surface area or the diameter of a radiator with a circular surface area.

[0056] The length of the reflector 5 in the direction perpendicular to the antenna array axis A1 can be between λ and λ / 10, where λ is the wavelength of the millimeter wave frequency radiation.

[0057] The reflective surface 5 includes at least one of a non-conductive reflector unit 5a and a plurality of parallel elongated conductive reflectors 5b.

[0058] exist Figures 3 to 7 The non-conductive reflector unit 5a shown includes a material with a high dielectric constant, i.e., a dielectric constant of at least 10, for example, 15, 20, or 40, thereby enabling a broadband scheme operating in the 20-50 GHz frequency range. The non-conductive reflector unit 5a may comprise ceramic or high-permeability plastic materials. High-permeability plastic materials typically have a dielectric constant as high as 25 and are generally more flexible than ceramics, thus less prone to breakage. On the other hand, ceramic materials are typically very hard and therefore more brittle. The dielectric constant of ceramics can range from 15-20 to several thousand.

[0059] The reflection and transmission of radiation occur due to the discontinuity at the boundary between the two materials, resulting in reflected waves in one material and transmitted waves in the other. If the thickness of the reflector element 5a is a multiple of half the wavelength λ / 2 (i.e., a positive integer), the reflection at the boundary will be zero at a specific frequency. This means that the reflector element 5a appears transparent to plane waves, which is undesirable. Therefore, to achieve maximum reflectivity, the thickness of the reflector element 5a must be ≠ nλ / 2, where n is a positive integer.

[0060] Therefore, the non-conductive reflector unit 5a can have a thickness ≤ λ / 4 in the direction perpendicular to the principal plane of the reflector unit 5a, where λ is the wavelength of the millimeter-wave frequency radiation. The thickness can be between λ / 8 and 3λ / 8. The non-conductive reflector unit 5a can also have a thickness in the direction perpendicular to the principal plane of the reflector unit 5a, which is an odd multiple of λ / 4, for example, 3λ / 8, to avoid multiples of λ / 2 mentioned above. Furthermore, the reflector bandwidth is limited by the wave impedance (i.e., the effective dielectric constant and parasitic resonances). Parasitic resonances occur above nλ / 2, limiting the highest usable frequency. Therefore, for the purpose of reflecting radiation, the thickness of the reflector unit 5a is preferably less than λ / 4.

[0061] The thickness can be ≤1mm, for example, 0.2mm when the dielectric constant is 40. When the dielectric constant is 40, the reflector unit 5a is too thin and may be prone to breakage or difficult to manufacture. Since the permittivity used when the dielectric constant is 20 is low, the thickness of the reflector unit 5a must be increased to about 0.5mm (λ / 8), which is preferred from a practical point of view. With a dielectric constant of 20, materials other than ceramics can be used, such as high-permittivity plastics, which are more robust and easier to place inside the device.

[0062] In the example where the radiation frequency is 30 GHz and the thickness of the non-conductive reflector element 5a is λ / 8, if the distance between the reflector element 5a and the antenna element 4 is between λ / 10 and λ / 5, the directivity can be around 8 dBi, covering the 24-29.5 and 37-43 GHz frequency bands.

[0063] Multiple parallel, elongated conductive reflectors 5b are arranged such that each pair of parallel, elongated conductive reflectors 5b is separated by an elongated gap 6. The longitudinal axis A2 of the parallel reflectors 5b and the longitudinal axis A3 of the gap 6 extend perpendicularly to the antenna array axis A1, as shown below. Figure 9 As shown. Vertical axes A2 and A3 can extend within the main plane of the reflecting surface 5. The conductive reflector 5b and the gaps 6 separating multiple pairs of parallel reflectors 5b can be formed in a conductive sheet, such as... Figure 9 As shown. The conductive sheet can be a copper sheet. The conductive reflector 5b / conductive sheet can be grounded to the frame 8 or the substrate 9.

[0064] Gap 6 is filled with a dielectric solid or air. Air has a dielectric constant of 1, while the dielectric solid can be any suitable material with a dielectric constant typically in the range of 2-5 (typically 3). The dielectric solid can consist of the main dielectric material of a conventional printed circuit board or liquid crystal polymer board, for example, when the reflective surface 5 (i.e., reflector 5b) is embedded in the board.

[0065] The lengths of the conductive reflector 5b and the gap 6 along the longitudinal axes A2 and A3 can range from λ to λ / 10, where λ is the wavelength of the millimeter-wave frequency radiation.

[0066] The gap 6 separating the multiple pairs of parallel reflectors 5b allows millimeter-wave frequency radiation with a first polarization (e.g., vertical polarization) to propagate between adjacent pairs of parallel reflectors 5b. The propagation of millimeter-wave frequency radiation with a second polarization (e.g., horizontal polarization) can remain unaffected by the reflecting surface 5.

[0067] This document has described various aspects and implementations in conjunction with different embodiments. However, those skilled in the art, upon studying the accompanying drawings, disclosure, and appended claims, will be able to understand and implement other variations of the disclosed embodiments in practicing the claimed subject matter. In the claims, the word "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. The enumeration of certain measures in dissimilar dependent claims does not imply that combinations of these measures cannot be used advantageously.

[0068] The reference numerals used in the claims should not be construed as limiting the scope. Unless otherwise stated, the drawings (e.g., cross shading, component arrangements, scale, degrees, etc.) should be read in conjunction with the specification and should be considered an integral part of the entire written description of the invention. The terms “horizontal,” “vertical,” “left,” “right,” “up,” and “down,” as well as their adjective and adverbial derivatives (e.g., “horizontally,” “to the right,” “upward,” etc.) used herein, when a particular drawing is facing the reader, simply indicate the orientation of the illustrated structure. Similarly, the terms “inward” and “outward” generally refer to the orientation of a surface relative to its axis of elongation or axis of rotation (where applicable).

Claims

1. An antenna device (1) for an electronic device (2), characterized in that, The antenna device includes: Antenna array (3), wherein the antenna array includes a plurality of antenna elements (4), the plurality of antenna elements being arranged along the antenna array axis (A1) and used to generate millimeter wave frequency radiation in a direction perpendicular to the antenna array axis (A1); At least one radiation reflecting surface (5), wherein the at least one radiation reflecting surface at least partially overlaps with the antenna array (3) and extends parallel to the antenna array axis (A1), the reflecting surface (5) being used to reflect at least a portion of the millimeter-wave frequency radiation in at least one of the directions. The reflective surface (5) includes at least one of the following: A non-conductive reflector unit (5a), wherein the non-conductive reflector unit comprises a material with a dielectric constant of at least 10; Multiple parallel elongated conductive reflectors (5b), wherein adjacent parallel elongated conductive reflectors (5b) are separated by elongated gaps (6), the longitudinal axis (A2) of the parallel elongated conductive reflectors (5b) and the longitudinal axis (A3) of the gaps (6) extending perpendicular to the antenna array axis (A1). The gap (6) is filled with dielectric solid or air; At least one of the antenna elements (4) is an end-fire antenna element (4), wherein the end-fire antenna element is used to generate millimeter-wave frequency radiation having a main beam direction (D0), a first polarization and a second polarization, the first polarization extending perpendicular to the main beam direction (D0), and the reflecting surface (5) is used to reflect the millimeter-wave frequency radiation having the first polarization.

2. The antenna device (1) according to claim 1, characterized in that, The reflective surface (5) is positioned at a distance less than or equal to λ / 2 from the antenna element (4), where λ is the wavelength of the millimeter wave frequency radiation.

3. The antenna device (1) according to claim 2, characterized in that, The reflective surface (5) is positioned at a distance between λ / 4 and λ / 10 from the antenna element (4).

4. The antenna device (1) according to claim 1, characterized in that, The reflective surface (5) is disposed in the near-field region of the antenna element (4), wherein the near-field region is located at a distance of less than [missing information] from the antenna element (4). The region is defined as follows: D is the maximum external dimension of the antenna element, and λ is the wavelength of the millimeter-wave frequency radiation.

5. The antenna device (1) according to claim 1, characterized in that, The non-conductive reflector unit (5a) comprises ceramic or plastic material.

6. The antenna device (1) according to claim 1, characterized in that, The non-conductive reflector unit (5a) has a thickness in a direction perpendicular to the main plane of the reflector unit (5a), wherein the thickness is ≤ λ / 4, and λ is the wavelength of the millimeter wave frequency radiation.

7. The antenna device (1) according to claim 1, characterized in that, The non-conductive reflector unit (5a) has a thickness in a direction perpendicular to the main plane of the reflector unit (5a), wherein the thickness is between λ / 8 and 3λ / 8, where λ is the wavelength of the millimeter wave frequency radiation.

8. The antenna device (1) according to claim 1, characterized in that, The non-conductive reflector unit (5a) has a thickness in a direction perpendicular to the main plane of the reflector unit (5a), wherein the thickness is an odd multiple of λ / 4, where λ is the wavelength of the millimeter wave frequency radiation.

9. The antenna device (1) according to claim 1, characterized in that, The conductive reflector (5b) and the gap (6) separating the parallel elongated conductive reflectors (5b) are formed in a conductive sheet.

10. The antenna device (1) according to claim 1, characterized in that, The length of the reflective surface (5) in the direction perpendicular to the antenna array axis (A1) is between λ and λ / 10, where λ is the wavelength of the millimeter wave frequency radiation.

11. The antenna device (1) according to claim 10, characterized in that, The lengths of the conductive reflector (5b) and the gap (6) along the longitudinal axis (A2, A3) range between λ and λ / 10, where λ is the wavelength of the millimeter wave frequency radiation.

12. The antenna device (1) according to claim 1, characterized in that, The gap (6) separating the parallel elongated conductive reflectors (5b) allows millimeter-wave frequency radiation with the first polarization to propagate between adjacent parallel elongated conductive reflectors (5b).

13. The antenna device (1) according to claim 1, characterized in that, The propagation of millimeter-wave frequency radiation with the second polarization is not affected by the reflecting surface (5).

14. An electronic device (2), characterized in that, The electronic device includes: a display panel (7); a frame (8); a substrate (9), wherein the substrate is at least surrounded by the display panel (7) and the frame (8); and an antenna device (1) according to any one of claims 1 to 13. The antenna device (1) is used to emit millimeter-wave frequency radiation with a first polarization propagating toward the display panel (7) and to emit millimeter-wave frequency radiation with a second polarization propagating toward the frame (8). The antenna device (1) is also used to reflect at least a portion of the millimeter-wave frequency radiation having the first polarization.

15. The electronic device (2) according to claim 14, characterized in that, The electronic device further includes at least one antenna (10), wherein the antenna is used to generate radiation outside the millimeter wave frequency range, the reflective surface (5) of the antenna device (1) is used to be disposed within the volume of the electronic device (2), the electronic device includes at least one signal feed probe (11) of the antenna (10), and the reflective surface (5) is disposed at a certain distance from the signal feed probe (11).

16. The electronic device (2) according to claim 14 or 15, characterized in that, The substrate (9) includes a flexible printed circuit.

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