Communication device and communication method

Abstract

The invention relates to a communication device, which comprises a first frequency selection surface element, a second frequency selection surface element, a feed-in radiation part, a first electron gun and a first electron collector, the second frequency-selective surface element is adjacent to the first frequency-selective surface element. The feed-in radiation part can generate an electromagnetic signal, wherein the electromagnetic signal can be propagated by using the first frequency selection surface element and the second frequency selection surface element. The first electron gun can emit a first electron beam. The first electron collector may receive a first electron beam. The first frequency selection surface element, the second frequency selection surface element and the feed-in radiation part can jointly form an antenna structure. A coupling effect can be generated between the first electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal can be enhanced.

Description

Technical Field

[0001] The present invention relates to a communication device, and more particularly to a communication device with high radiation gain. Background Art

[0002] In the Non-Terrestrial Networks (NTN) architecture of 5G and 6G, satellites and high-altitude platform systems are seen as important components to supplement traditional ground mobile networks. Among them, geosynchronous orbit (GSO) satellites remain in a fixed position on the earth and are mainly used for broadcasting and fixed communications; medium earth orbit (MEO) satellites, such as GPS and Galileo, are located at an intermediate orbital altitude; low earth orbit (LEO) satellites, such as SpaceX's Starlink, provide close-range high-speed communications with low latency. In addition, although high-altitude platform systems (HAPS) are not satellites, as communication platforms flying in the atmosphere, they fill the communication coverage gap between the ground and satellites. Whether it is GSO, MEO, LEO satellites or HAPS, their common feature is the need to communicate across long distances. Such distances require high-power and high-efficiency amplifiers to ensure the strength and quality of the signal. Solid State Power Amplifier (SSPA) and Traveling Wave Tube Amplifier (TWTA) are two types of amplifiers commonly used in these applications, with SSPA being characterized by its solid-state design and TWTA being characterized by its high power output. As the demands of communications increase, the performance and efficiency of these amplifiers will become a key area of ​​research and development.

[0003] In addition, array antennas, also known as phased array antennas, are particularly useful for satellite and HAPS communications due to their ability to electronically scan and form directional beams. Such antennas can quickly and flexibly adjust their beam direction to respond to dynamic communication environments and needs.

[0004] Therefore, further optimization of high-performance SSPA and TWTA amplifiers, as well as the integration and development of array antennas, will be key components of future non-terrestrial network technology architectures. Summary of the invention

[0005] In a preferred embodiment, the present invention provides a communication device, comprising: a first frequency selective surface element; a second frequency selective surface element adjacent to the first frequency selective surface element; a feed radiation portion, generating an electromagnetic signal, wherein the electromagnetic signal is propagated by using the first frequency selective surface element and the second frequency selective surface element; a first electron gun, emitting a first electron beam; and a first electron collector, receiving the first electron beam; wherein the first frequency selective surface element, the second frequency selective surface element, and the feed radiation portion together form an antenna structure; wherein a coupling effect occurs between the first electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal will be enhanced.

[0006] In some embodiments, the first frequency selective surface element is configured to partially reflect and partially transmit the electromagnetic signal.

[0007] In some embodiments, the second frequency selective surface element is configured to completely reflect the electromagnetic signal.

[0008] In some embodiments, the second frequency selective surface element is made of an artificial magnetic conductor material.

[0009] In some embodiments, the second frequency selective surface element is made of a metal material.

[0010] In some embodiments, the feed radiation portion is implemented by a patch antenna.

[0011] In some embodiments, the antenna structure covers an operating frequency band between 60 GHz and 500 GHz.

[0012] In some embodiments, a specific distance between the first frequency selective surface element and the second frequency selective surface element is substantially equal to 0.25 or 0.5 wavelengths of the operating frequency band.

[0013] In some embodiments, the communication device further comprises: a first multi-beam aperture plate disposed between the first electron gun and the first electron collector, wherein the first multi-beam aperture plate is used to decompose the first electron beam into a plurality of first small beams.

[0014] In some embodiments, the communication device further includes: a second electron gun that emits a second electron beam; and a second electron collector that receives the second electron beam; wherein another coupling effect occurs between the second electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal will be further enhanced.

[0015] In some embodiments, the second electron beam has a different emission direction than the first electron beam.

[0016] In some embodiments, the communication device further comprises: a second multi-beam aperture plate disposed between the second electron gun and the second electron collector, wherein the second multi-beam aperture plate is used to decompose the second electron beam into a plurality of second small beams.

[0017] In some embodiments, the first multi-beam aperture plate and the second multi-beam aperture plate are each implemented by a silicon photonics substrate.

[0018] In another preferred embodiment, the present invention provides a communication method, comprising the following steps: generating an electromagnetic signal through a feed radiation portion; propagating the electromagnetic signal using a first frequency selective surface element and a second frequency selective surface element, wherein the second frequency selective surface element is adjacent to the first frequency selective surface element, and the first frequency selective surface element, the second frequency selective surface element, and the feed radiation portion together form an antenna structure; emitting a first electron beam through a first electron gun; and receiving the first electron beam through a first electron collector, wherein a coupling effect occurs between the first electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal will be enhanced.

[0019] In some embodiments, the communication method further comprises: decomposing the first electron beam into a plurality of first small beams by a first multi-beam aperture plate, wherein the first multi-beam aperture plate is disposed between the first electron gun and the first electron collector.

[0020] In some embodiments, the communication method further includes: emitting a second electron beam through a second electron gun; and receiving the second electron beam through a second electron collector, wherein another coupling effect occurs between the second electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal will be further enhanced.

[0021] In some embodiments, the communication method further comprises: decomposing the second electron beam into a plurality of second small beams by a second multi-beam aperture plate, wherein the second multi-beam aperture plate is disposed between the second electron gun and the second electron collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram showing a communication device according to an embodiment of the present invention.

[0023] Figure 2 A schematic diagram showing a communication device according to an embodiment of the present invention.

[0024] Figure 3 A schematic diagram showing a communication device according to an embodiment of the present invention.

[0025] Figure 4A three-dimensional diagram showing a communication device according to an embodiment of the present invention.

[0026] Figure 5 A flow chart of a communication method according to an embodiment of the present invention is shown.

[0027] Explanation of symbols:

[0028] 100,200,300,400: Communication device

[0029] 110,410: first frequency selective surface element

[0030] 120,420: Second frequency selective surface element

[0031] 130,430: Feed radiation part

[0032] 140: The first electron gun

[0033] 150:First electron collector

[0034] 160: First electron beam

[0035] 160-1, 160-2, 160-N: First small beam

[0036] 270: First multi-beam aperture plate

[0037] 340: Second electron gun

[0038] 350: Second electron collector

[0039] 360: Second electron beam

[0040] 360-1, 360-2, 360-M: Second small beam

[0041] 370: Second multi-beam aperture plate

[0042] 415: first dielectric substrate

[0043] 417-1,417-2,417-K:Metal strips

[0044] 425: Second dielectric substrate

[0045] 427-1,427-2,427-R:Metal unit

[0046] DS: Specific distance

[0047] S510, S520, S530, S540: Steps

[0048] SE: Electromagnetic signal

[0049] X: X-axis

[0050] Y: Y axis

[0051] Z: Z axis DETAILED DESCRIPTION

[0052] In order to make the purpose, features and advantages of the present invention more clearly understood, specific embodiments of the present invention are given below and described in detail with reference to the accompanying drawings.

[0053] Certain words are used in the specification and claims to refer to specific components. It should be understood by those skilled in the art that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. The words "include" and "comprise" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "include but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem and achieve the basic technical effect within a certain error range. In addition, the word "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device via other devices or connection means.

[0054] The following disclosure provides many different embodiments or examples to implement the different features of the present invention. The following disclosure describes specific examples of various components and their arrangements to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the present disclosure describes a first feature formed on or above a second feature, it means that it may include an embodiment in which the first feature and the second feature are in direct contact, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. In addition, the different examples disclosed below may reuse the same reference symbols or (and) marks. These repetitions are for the purpose of simplification and clarity, and are not intended to limit the specific relationship between the different embodiments or (and) structures discussed.

[0055] In addition, spatially related terms such as "below", "below", "lower", "above", "higher" and similar terms are used to facilitate the description of the relationship between one element or feature and another element or feature in the drawings. In addition to the orientation shown in the drawings, these spatially related terms are intended to include different orientations of the device in use or operation. The device may be turned to different orientations (rotated 90 degrees or other orientations), and the spatially related terms used herein may be interpreted accordingly.

[0056] Figure 1 A schematic diagram of a communication device 100 according to an embodiment of the present invention is shown. For example, the communication device 100 may be a wireless access point, a wearable device, a smart phone, a tablet computer, or a notebook computer. Alternatively, the communication device 100 may be any unit in the Internet of Things (IOT), but is not limited thereto.

[0057] exist Figure 1 In the embodiment of the present invention, the communication device 100 includes: a first frequency selective surface (FSS) element 110, a second frequency selective surface element 120, a feeding radiation element 130, a first electron gun 140, and a first electron collector 150. It should be understood that although not shown in FIG. Figure 1 However, the communication device 100 may further include other components, such as a processor, a touch panel, a speaker, or (and) a housing.

[0058] The second frequency selective surface element 120 is adjacent to the first frequency selective surface element 110, wherein the first frequency selective surface element 110 and the second frequency selective surface element 120 may be substantially parallel to each other. For example, the first frequency selective surface element 110 may be a partially reflective surface (PRS) element. The second frequency selective surface element 120 may be made of an artificial magnetic conductor (AMC) material. Alternatively, the second frequency selective surface element 120 may be made of a metal material. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a situation where the distance between the two corresponding elements is less than a predetermined distance (for example, 10 mm or less), but generally does not include a situation where the two corresponding elements are in direct contact with each other (that is, the aforementioned distance is shortened to 0).

[0059] The feed radiator 130 can be used to generate an electromagnetic signal SE. In addition, the feed radiator 130 can be coupled to a signal source (Signal Source) (not shown). The shape and type of the feed radiator 130 are not particularly limited in the present invention. For example, the feed radiator 130 can be implemented by a patch antenna, a monopole antenna, a dipole antenna, a loop antenna, or a planar inverted F antenna (PIFA).

[0060] The electromagnetic signal SE can be propagated by using the first frequency selective surface element 110 and the second frequency selective surface element 120. For example, the first frequency selective surface element 110 can be used to partially reflect and partially transmit the electromagnetic signal SE, while the second frequency selective surface element 120 can be used to completely reflect the electromagnetic signal SE. In a preferred embodiment, the first frequency selective surface element 110, the second frequency selective surface element 120, and the feed radiation portion 130 can together form an antenna structure (Antenna Structure) of the communication device 100. Because the electromagnetic signal SE can induce constructive interference (Constructive Interference) near the first frequency selective surface element 110, the antenna structure of the communication device 100 will be able to provide a relatively high radiation gain (Radiation Gain).

[0061] In some embodiments, the antenna structure of the communication device 100 may cover an operating frequency band between 60 GHz and 500 GHz to support broadband operation in the millimeter wave (mmWave) frequency band. However, the present invention is not limited thereto. In other embodiments, the antenna structure of the communication device 100 may also support broadband operation in the terahertz (THz) frequency band.

[0062] In order to strengthen the aforementioned constructive interference, a specific distance DS between the first frequency selective surface element 110 and the second frequency selective surface element 120 may be appropriately designed. For example, if the second frequency selective surface element 120 is made of an artificial magnetic conductor material, the specific distance DS may be substantially equal to 0.25 times the wavelength (λ / 4) of the operating frequency band of the antenna structure of the communication device 100. Alternatively, if the second frequency selective surface element 120 is made of a metal material, the specific distance DS may be substantially equal to 0.5 times the wavelength (λ / 2) of the operating frequency band of the antenna structure of the communication device 100. In some embodiments, the first frequency selective surface element 110 and the second frequency selective surface element 120 may each be implemented by a multi-layer structure. In some embodiments, the length of each of the first frequency selective surface element 110 and the second frequency selective surface element 120 may be greater than or equal to 10 times the wavelength (10λ) of the operating frequency band of the antenna structure of the communication device 100. In some embodiments, the width of each of the first frequency selective surface element 110 and the second frequency selective surface element 120 may be greater than or equal to 10 times the wavelength (10λ) of the operating frequency band of the antenna structure of the communication device 100. In addition, the aforementioned specific distance DS may also be substantially equal to 0.1 times the wavelength (λ / 10) of the operating frequency band of the antenna structure of the communication device 100.

[0063] The first electron gun 140 can be used to emit a first electron beam 160, and the first electron collector 150 can be used to receive the first electron beam 160. In some embodiments, the emission direction of the first electron beam 160 can be substantially parallel to the first frequency selective surface element 110 and the second frequency selective surface element 120, but it is not limited thereto. It should be noted that the first electron beam 160 can appear between the first frequency selective surface element 110 and the second frequency selective surface element 120, wherein the first electron beam 160 can interact with the aforementioned electromagnetic signal SE. Generally speaking, a coupling effect occurs between the first electron beam 160 and the electromagnetic signal SE, so that the radiation energy of the electromagnetic signal SE will be enhanced. Under this design, since part of the energy of the first electron beam 160 will be transferred to the electromagnetic signal SE and offset the propagation attenuation of the electromagnetic signal SE, the radiation gain of the antenna structure of the communication device 100 will be greatly improved.

[0064] The following embodiments will introduce various configurations and detailed structural features of the communication device 100. It should be understood that these drawings and descriptions are only for illustrative purposes and are not intended to limit the present invention.

[0065] Figure 2 A schematic diagram showing a communication device 200 according to an embodiment of the present invention is shown. Figure 2 and Figure 1 Similar. Figure 2 In the embodiment of the present invention, the communication device 200 further includes a first multi-beam aperture plate 270. The first multi-beam aperture plate 270 is disposed between the first electron gun 140 and the first electron collector 150. The first multi-beam aperture plate 270 can be used to decompose the first electron beam 160 into a plurality of first small beams 160-1, 160-2, ..., 160-N, wherein "N" is any positive integer greater than or equal to 2. For example, the first multi-beam aperture plate 270 can have N openings, wherein the diameter of each opening can be less than or equal to 100 μm, but is not limited thereto.

[0066] The aforementioned first small beams 160-1, 160-2, ..., 160-N may have different emission directions. For example, an angle between the emission directions of any two adjacent ones of the aforementioned first small beams 160-1, 160-2, ..., 160-N may be between 0 degrees and 60 degrees, but is not limited thereto. According to actual measurement results, the aforementioned first small beams 160-1, 160-2, ..., 160-N may also be used to enhance the radiation energy of the electromagnetic signal SE in various directions. Figure 2 The remaining features of the communication device 200 are the same as Figure 1 The communication device 100 is similar to the embodiment, so the two embodiments can achieve similar operating effects.

[0067] Figure 3 A schematic diagram showing a communication device 300 according to an embodiment of the present invention is shown. Figure 3 and Figure 1 Similar. Figure 3In the embodiment of the present invention, in addition to the aforementioned first electron gun 140 and the first electron collector 150 (not shown), the communication device 300 may further include a second electron gun 340, a second electron collector 350, and a second multi-beam aperture plate 370. The second electron gun 340 may be used to emit a second electron beam 360, and the second electron collector 350 may be used to receive the second electron beam 360. In some embodiments, the emission direction of the second electron beam 360 may also be substantially parallel to both the first frequency selective surface element 110 and the second frequency selective surface element 120, but the second electron beam 360 may have a different emission direction from the aforementioned first electron beam 160. Similarly, the second electron beam 360 may appear between the first frequency selective surface element 110 and the second frequency selective surface element 120, wherein the second electron beam 360 may also interact with the aforementioned electromagnetic signal SE. Generally speaking, another coupling effect occurs between the second electron beam 360 and the electromagnetic signal SE, so that the radiation energy of the electromagnetic signal SE will be further enhanced. In addition, the second multi-beam aperture plate 370 is disposed between the second electron gun 340 and the second electron collector 350. The second multi-beam aperture plate 370 can be used to decompose the second electron beam 360 into a plurality of second small beams 360-1, 360-2, ..., 360-M, where "M" is any positive integer greater than or equal to 2. The aforementioned second small beams 360-1, 360-2, ..., 360-M can have different emission directions. For example, another angle between the emission directions of any two adjacent ones of the aforementioned second small beams 360-1, 360-2, ..., 360-M can be between 0 degrees and 60 degrees, but is not limited thereto. According to actual measurement results, the aforementioned second small beams 360-1, 360-2, ..., 360-M can also be used to enhance the radiation energy of the electromagnetic signal SE in various directions. It must be understood that the second multi-beam aperture plate 370 is only an optional component and can also be removed in other embodiments. Figure 3 The remaining features of the communication device 300 are the same as Figure 1 The communication device 100 is similar to the embodiment, so the two embodiments can achieve similar operating effects.

[0068] In some embodiments, the first multi-beam aperture plate 270 and the second multi-beam aperture plate 370 may be implemented by a silicon photonic substrate. In other embodiments, the first multi-beam aperture plate 270 and the second multi-beam aperture plate 370 may be implemented by an electromagnetic lens, a microstructure array, or an electronic grating, but are not limited thereto.

[0069] Figure 4 A perspective view of a communication device 400 according to an embodiment of the present invention is shown. Figure 4 and Figure 3 Similar. Figure 4 In an embodiment of the present invention, a first frequency selective surface element 410 of the communication device 400 includes a first dielectric substrate 415 and a plurality of metal strips 417-1, 417-2, ..., 417-K, wherein "K" is any positive integer greater than or equal to 2. The aforementioned metal strips 417-1, 417-2, ..., 417-K may be disposed on the first dielectric substrate 415 at intervals to form a periodic structure. In some embodiments, the aforementioned periodic structure may provide a reflectivity greater than 50%. In other embodiments, the aforementioned metal strips 417-1, 417-2, ..., 417-K may have unequal widths and spacings to be suitable for a plurality of different operating frequency bands.

[0070] In addition, a second frequency selective surface element 420 of the communication device 400 includes a second dielectric substrate 425 and a plurality of metal units 427-1, 427-2, ..., 427-R, wherein "R" is any positive integer greater than or equal to 2. For example, each metal unit may be a square metal sheet, but is not limited thereto. The aforementioned metal units 427-1, 427-2, ..., 427-R may also be disposed at intervals on a surface of the second dielectric substrate 425 to form another periodic structure. In some embodiments, the aforementioned periodic structure may provide a phase compensation (Phase Compensation) between 30 degrees and 180 degrees (for example, it may be based on the lowest operating frequency). In some embodiments, the second frequency selective surface element 420 may also include a ground plane (not shown), which may be disposed on another surface opposite to the second dielectric substrate 425. A feeding radiation portion 430 of the communication device 400 may be implemented by a patch antenna, which may be surrounded by the aforementioned metal units 427 - 1 , 427 - 2 , . . . , 427 -R.

[0071] In some embodiments, considering higher power operation, a metal element may be replaced with a vacuum area according to Babinet's Principle without using any dielectric substrate. For example, the metal thickness of each of the first frequency selective surface element 110 and the second frequency selective surface element 120 may be greater than or equal to 1 mm, but is not limited thereto. Furthermore, the first frequency selective surface element 110 and the second frequency selective surface element 120 may be stacked in multiple layers (e.g., more than 2 layers) so as to be used as a heat sink element. It should be noted that in the design of a multi-layer stack, the size of the aforementioned metal strip or metal unit may be slightly different from that of a single-layer structure to maintain the required reflectivity or phase compensation amount.

[0072] In other embodiments, the communication device 400 may further include more feed radiation parts 430 to form an antenna array. In the communication device 400, the first frequency selective surface element 410 and the second frequency selective surface element 420 may be arranged substantially perpendicular to the Z axis, wherein the emission direction of the first electron beam 160 may be substantially parallel to the X axis, and the emission direction of the second electron beam 360 may be substantially parallel to the Y axis, but not limited thereto. As mentioned above, the first electron beam 160 and the second electron beam 360 may be used to simultaneously enhance the radiation energy of the aforementioned electromagnetic signal SE (not shown), thereby improving the radiation gain of the antenna structure of the communication device 400. Figure 4 The remaining features of the communication device 400 are the same as Figure 4 The communication device 300 is similar, so the two embodiments can achieve similar operating effects.

[0073] In other embodiments, in order to further reduce weight, an electron beam of a traveling wave tube amplifier (TWTA) can be incident on a dielectric laser accelerator (DLA), wherein the dielectric laser accelerator can be integrated on a chip. In addition, the dielectric laser accelerator can also be disposed on the same carrier board as the aforementioned antenna structure.

[0074] Figure 5A flow chart of a communication method according to an embodiment of the present invention is shown. First, in step S510, an electromagnetic signal is generated through a feed-in radiation portion. In step S520, a first frequency selective surface element and a second frequency selective surface element are used to propagate the electromagnetic signal, wherein the second frequency selective surface element is adjacent to the first frequency selective surface element, and the first frequency selective surface element, the second frequency selective surface element, and the feed-in radiation portion together form an antenna structure. In step S530, a first electron beam is emitted through a first electron gun. Finally, in step S540, the first electron beam is received through a first electron collector, wherein a coupling effect occurs between the first electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal will be enhanced. It must be understood that the above steps do not need to be performed in sequence, but Figure 1-4 Each feature of the embodiment of the present invention can be applied to Figure 5 of communication methods.

[0075] The present invention provides a novel communication device. According to actual measurement results, the overall antenna radiation gain of the communication device using the above design will be significantly improved, so it is very suitable for application in various types of equipment.

[0076] It is worth noting that the above-mentioned component sizes are not limiting conditions of the present invention. Designers can adjust these setting values ​​according to different needs. The communication device and communication method of the present invention are not limited to Figure 1-5 The present invention may only include Figure 1-5 In other words, not all of the features shown need to be implemented in the communication device and communication method of the present invention at the same time.

[0077] The method of the present invention, or a specific form or part thereof, may exist in the form of program code. The program code may be contained in a physical medium, such as a floppy disk, a CD, a hard disk, or any other machine-readable (such as computer-readable) storage medium, or a computer program product that is not limited to an external form, wherein when the program code is loaded and executed by a machine, such as a computer, the machine becomes a device for participating in the present invention. The program code may also be transmitted through some transmission medium, such as wires or cables, optical fibers, or any transmission mode, wherein when the program code is received, loaded and executed by a machine, such as a computer, the machine becomes a device for participating in the present invention. When actually operated on a general-purpose processing unit, the program code combines with the processing unit to provide a unique device that operates similarly to an application-specific logic circuit.

[0078] In the present specification and claims, ordinal numbers, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to distinguish two different components with the same name.

[0079] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A communication device, include: a first frequency selective surface element; a second frequency selective surface element, adjacent to the first frequency selective surface element; A feed radiation portion, generating an electromagnetic signal, wherein the electromagnetic signal is propagated by using the first frequency selective surface element and the second frequency selective surface element; a first electron gun emitting a first electron beam; and a first electron collector, receiving the first electron beam; The first frequency selective surface element, the second frequency selective surface element, and the feed radiation portion together form an antenna structure; A coupling effect occurs between the first electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal is enhanced.

2. The communication device as claimed in claim 1, wherein the first frequency selective surface element is configured to partially reflect and partially transmit the electromagnetic signal. 3 . The communication device as claimed in claim 1 , wherein the second frequency selective surface element is configured to completely reflect the electromagnetic signal.

4. The communication device as claimed in claim 1, wherein the second frequency selective surface element is made of an artificial magnetic conductor material. 5 . The communication device as claimed in claim 1 , wherein the second frequency selective surface element is made of a metal material.

6. The communication device as claimed in claim 1, wherein the feed radiation portion is implemented by a patch antenna. 7 . The communication device as claimed in claim 1 , wherein the antenna structure covers an operating frequency band, and the operating frequency band is between 60 GHz and 500 GHz. 8 . The communication device as claimed in claim 7 , wherein a specific distance between the first frequency selective surface element and the second frequency selective surface element is substantially equal to 0.25 or 0.5 wavelength of the operating frequency band.

9. The communication device as claimed in claim 1, further comprising: include: A first multi-beam aperture plate is disposed between the first electron gun and the first electron collector, wherein the first multi-beam aperture plate is used to decompose the first electron beam into a plurality of first small beams.

10. The communication device as claimed in claim 9, further comprising: include: a second electron gun emitting a second electron beam; as well as a second electron collector, receiving the second electron beam; Another coupling effect occurs between the second electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal is further enhanced. The communication device as claimed in claim 10 , wherein the second electron beam and the first electron beam have different emission directions.

12. The communication device according to claim 10, further comprising: include: A second multi-beam aperture plate is disposed between the second electron gun and the second electron collector, wherein the second multi-beam aperture plate is used for decomposing the second electron beam into a plurality of second small beams. 13 . The communication device as claimed in claim 12 , wherein the first multi-beam aperture plate and the second multi-beam aperture plate are each implemented by a silicon photonics substrate.

14. A communication method comprising the following steps: An electromagnetic signal is generated through a feed-in radiation portion; Using a first frequency selective surface element and a second frequency selective surface element to propagate the electromagnetic signal, wherein the second frequency selective surface element is adjacent to the first frequency selective surface element, and the first frequency selective surface element, the second frequency selective surface element, and the feeding radiation portion together form an antenna structure; emitting a first electron beam through a first electron gun; and The first electron beam is received by a first electron collector, wherein a coupling effect occurs between the first electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal is enhanced. 15 . The communication method as claimed in claim 14 , wherein the antenna structure covers an operating frequency band, and the operating frequency band is between 60 GHz and 500 GHz. 16 . The communication method as claimed in claim 15 , wherein a specific distance between the first frequency selective surface element and the second frequency selective surface element is substantially equal to 0.25 times or 0.5 times the wavelength of the operating frequency band.

17. The communication method according to claim 14, further comprising: include: The first electron beam is decomposed into a plurality of first small beams by a first multi-beam aperture plate, wherein the first multi-beam aperture plate is arranged between the first electron gun and the first electron collector.

18. The communication method according to claim 17, further comprising: include: emitting a second electron beam through a second electron gun; as well as The second electron beam is received by a second electron collector, wherein another coupling effect occurs between the second electron beam and the electromagnetic signal, so that the radiation energy of the electromagnetic signal is further enhanced.

19. The communication method as claimed in claim 18, wherein the second electron beam and the first electron beam have different emission directions.

20. The communication method according to claim 18, further comprising: include: The second electron beam is decomposed into a plurality of second small beams by a second multi-beam aperture plate, wherein the second multi-beam aperture plate is arranged between the second electron gun and the second electron collector.

Images