A communication device

Abstract

This application provides a communication device, relating to the field of antenna technology, for solving the problem of improving antenna gain without interfering with antenna modularity. Specifically, the communication device includes an antenna and a dense medium. The dense medium is located in the transmission direction of the antenna and is spaced apart from the antenna. The dielectric constant of the medium on the side of the dense medium closer to the antenna and the dielectric constant of the medium on the side of the dense medium farther from the antenna are both less than the dielectric constant of the dense medium. The thickness D of the dense medium from the surface closer to the antenna to the surface farther from the antenna satisfies: 0.5nλg(1-10%)≤D≤0.5nλg(1+10%), where n=1,2,3…, and λg is the resonant wavelength of the antenna operating frequency band in the dense medium. The communication device provided by this application is used to transmit and receive electromagnetic wave signals.

Description

[0001] This application is a divisional application of the invention patent application filed with the China National Intellectual Property Administration, application number 202210103508.9, filed on January 27, 2022, entitled "A Communication Device". Technical Field

[0002] This application relates to the field of antenna technology, and more particularly to a communication device with an antenna. Background Technology

[0003] Currently, signals in frequency bands such as Sub-6GHz, millimeter wave (mmWave), and terahertz (THz) experience varying degrees of attenuation during transmission in space. To improve the coverage of equipment (base stations or terminals), this problem is generally addressed by increasing the antenna gain. To improve antenna gain, the antenna's shape, material, or size can be optimized. However, antennas such as mmWave antennas are relatively small and tend to be modular. Changing their shape, material, or size would significantly increase the manufacturing difficulty and cost, making it difficult to improve the gain of these antennas. Summary of the Invention

[0004] This application provides a communication device for solving the problem of how to improve antenna gain without interfering with antenna modularization.

[0005] To achieve the above objectives, embodiments of this application provide a communication device comprising an antenna and a dense medium. The dense medium is located in the transmission direction of the antenna and is spaced apart from the antenna. The dielectric constant of the medium located on the side of the dense medium closer to the antenna and the dielectric constant of the medium located on the side of the dense medium farther from the antenna are both less than the dielectric constant of the dense medium. The thickness D of the dense medium from the surface closer to the antenna to the surface farther from the antenna satisfies: 0.5nλg(1-10%)≤D≤0.5nλg(1+10%), where n=1,2,3…, and λg is the resonant wavelength of the antenna operating frequency band in the dense medium.

[0006] Because the dielectric constant of the medium located on the antenna side of the denser medium and the dielectric constant of the medium located on the antenna side of the denser medium are both lower than the dielectric constant of the denser medium, the dielectric constant of the medium located on the antenna side of the denser medium and the medium located on the antenna side of the denser medium is lower than that of the denser medium, and they are classified as less dense media. When the electromagnetic wave emitted by the antenna enters the denser medium from the less dense medium located on the antenna side, it undergoes a first wave division. Assuming the transmitted electromagnetic wave is the first transmitted electromagnetic wave and the reflected electromagnetic wave is the first reflected electromagnetic wave, the first transmitted electromagnetic wave passes through the denser medium and enters the less dense medium located on the antenna side of the denser medium, undergoing a second wave division. In the second wave division, the transmitted electromagnetic wave is the second transmitted electromagnetic wave, and the reflected electromagnetic wave is the second reflected electromagnetic wave. The second reflected electromagnetic wave reverses and passes through the denser medium into the less dense medium located on the antenna side of the denser medium, and the transmitted electromagnetic wave is the third transmitted electromagnetic wave. Based on this, since the thickness D of the dense medium from the surface near the antenna to the surface away from the antenna satisfies: 0.5nλg(1-10%)≤D≤0.5nλg(1+10%), where n=1,2,3,…,λg is the resonant wavelength of the antenna's operating frequency band in the dense medium, the thickness of the dense medium is an integer multiple of half the wavelength of the antenna in the dense medium. The dense medium forms a Fabry-Perot resonator, and electromagnetic waves reflected from the less dense medium to the dense medium have a 180° phase difference and transmitted with a 0° phase difference; reflected from the dense medium to the less dense medium have a 0° phase difference and transmitted with a 0° phase difference. That is, there is a 180° phase difference between the first reflected electromagnetic wave and the electromagnetic wave emitted by the antenna. There is a 0° phase difference between the electromagnetic wave emitted by the antenna and the first transmitted electromagnetic wave, between the first transmitted electromagnetic wave and the second reflected electromagnetic wave, and between the second reflected electromagnetic wave and the third transmitted electromagnetic wave. Therefore, the phase difference between the first reflected electromagnetic wave and the third transmitted electromagnetic wave is exactly 180°, which is an interference phase cancellation. Therefore, the Fabry-Perot resonator can achieve the anti-reflection effect and improve the antenna gain.

[0007] In one possible implementation, n=1. This results in a smaller thickness D of the spectral density medium, allowing for installation within space-constrained communication devices and enabling the thinning of the communication equipment.

[0008] In one possible implementation, the thickness D of the high-density dielectric is less than or equal to 2 mm. This facilitates the installation of the high-density dielectric within space-constrained communication equipment, ensuring the thinness of the communication device.

[0009] In one possible implementation, the thickness D of the high-density dielectric is also greater than or equal to 0.1 mm. This ensures the structural strength of the high-density dielectric 40, facilitating its installation within communication equipment.

[0010] In one possible implementation, the thickness D of the bromide medium can be 0.1 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2.0 mm.

[0011] In one possible implementation, the dielectric constant DK of the dense medium is greater than or equal to 14 and less than or equal to 40. This way, when n=1 and the antenna is a mmWave band antenna, the antenna's operating frequency band is between 24GHz and 40GHz, and the thickness D of the dense medium is approximately 1mm. This allows for maintaining the structural strength of the dense medium without compromising the thinness of the communication equipment.

[0012] In one possible implementation, the material of the PWM medium is zirconia ceramic. Zirconia ceramic has a dielectric constant DK of 30. When n=1, the thickness D of the PWM medium is about 1mm, which can ensure the structural strength of the PWM medium without affecting the thinness of the communication equipment.

[0013] In one possible implementation, the antenna is separated from the dense medium by an air gap, with the air forming the medium within the communication device located on the antenna side of the dense medium. Air has a low dielectric constant, thus having a smaller impact on the Fabry-Perot effect of the dense medium.

[0014] In one possible implementation, the distance between the antenna and the denser medium is greater than 0 mm and less than 10 mm. This minimizes the impact on the thinness of the communication device, while the denser medium provides a better boost to the antenna gain.

[0015] In one possible implementation, the spacing between the antenna and the denser medium is greater than 0.02 mm and less than 3 mm. This minimizes the impact on the thinness of the communication device, while the denser medium provides a better boost to the antenna gain.

[0016] In one possible implementation, the spacing between the antenna and the denser medium is greater than or equal to 0.5 mm and less than or equal to 1 mm. This minimizes the impact on the thinness of the communication device, while the denser medium provides a better boost to the antenna gain.

[0017] In one possible implementation, the communication device further includes a back cover. An antenna is located inside the back cover, and a dense dielectric medium is located between the antenna and the back cover and disposed on the inner surface of the back cover. The back cover forms the dielectric medium within the communication device located on the side of the dense dielectric medium away from the antenna. Optionally, the back cover can be made of plastic or glass. Plastics and glass have lower dielectric constants, thus having a smaller impact on the Fabry-Perot effect of the dense dielectric medium.

[0018] In one possible implementation, the communication device also includes a back cover. The antenna is located inside the back cover, and a high-density dielectric is embedded in the area of ​​the back cover opposite the antenna. This reduces the thickness of the communication device, facilitating its thinner design.

[0019] In one possible implementation, the hole on the back cover for embedding the bromide medium can be either a blind hole or a through hole. When the hole on the back cover for embedding the bromide medium is a blind hole, the blind hole can penetrate the inner surface of the back cover but not the outer surface, or it can penetrate the outer surface of the back cover but not the inner surface; no specific limitation is made here. When the hole on the back cover for embedding the bromide medium is a blind hole, and the blind hole penetrates the inner surface of the back cover but not the outer surface, a portion of the bromide medium is located on the inner side of the back cover, and the other portion is embedded in the blind hole. When the hole on the back cover for embedding the bromide medium is a blind hole, and the blind hole penetrates the outer surface of the back cover but not the inner surface, a portion of the bromide medium is located on the outer side of the back cover, and the other portion is embedded in the blind hole.

[0020] In one possible implementation, when the hole on the back cover for embedding the dense medium is a through hole, the surface of the dense medium away from the antenna can be flush with the outer surface of the back cover or protrude to the outside of the back cover. Optionally, the surface of the dense medium away from the antenna is flush with the outer surface of the back cover. This improves the aesthetic appearance of the communication device.

[0021] In one possible implementation, the communication device further includes a back cover; the antenna is located inside the back cover, and the high-density medium includes a first part and a second part. The first part is formed by a portion of the back cover, and the second part is located between the first part and the antenna, and is disposed on the inner surface of the first part. In this way, the sum of the thicknesses of the first and second parts equals the thickness of the high-density medium, which also contributes to the thinning of the communication device. Furthermore, since the second part is disposed on the surface of the first part near the antenna, it does not affect the appearance of the communication device.

[0022] In one possible implementation, the second part may be located on the side of the first part away from the antenna and disposed on the outer surface of the first part. Alternatively, a portion of the second part may be located between the first part and the antenna and disposed on the inner surface of the first part, while another portion may be located on the side of the first part away from the antenna and disposed on the outer surface of the first part.

[0023] In one possible implementation, the first and second parts are molded as a single unit. This reduces the structural complexity of the communication device and improves assembly efficiency.

[0024] In one possible implementation, the communication device further includes a back cover; the antenna is located inside the back cover, and the high-density dielectric is located outside the back cover, with the high-density dielectric disposed on the outer surface of the back cover. In this way, the high-density dielectric does not occupy the internal space of the communication device, thus avoiding any compression of the installation space for other components within the communication device.

[0025] In one possible implementation, the antenna's orthographic projection onto the back cover is a first projection, and the dense medium's orthographic projection onto the back cover is a second projection. The area of ​​the second projection is larger than the area of ​​the first projection, and the edge of the second projection lies outside the edge of the first projection, with the edges of the second and first projections spaced apart. In this way, the size of the dense medium exceeds the size of the antenna, allowing it to completely cover the antenna and maximizing its gain.

[0026] In one possible implementation, the antenna is a millimeter-wave band antenna. Compared to the Sub-6GHz band, the millimeter-wave band offers higher bandwidth, wider connectivity, and lower latency. However, millimeter-wave signals attenuate rapidly in space, necessitating increased gain to improve the coverage of millimeter-wave communication devices (such as base stations or terminals). Furthermore, compared to the terahertz band, the millimeter-wave band is less expensive, thus offering greater applicability. Attached Figure Description

[0027] Figure 1 This is a front view of a communication device provided in some embodiments of this application; Figure 2 for Figure 1 A schematic diagram of the rear structure of the communication device shown. Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the communication device shown along the AA direction; Figure 4 for Figure 3 A schematic diagram showing the relative positions of the middle plate, back cover, antenna, and high-density medium inside the communication device. Figure 5 for Figure 4 A schematic diagram of the transmission path of electromagnetic waves emitted by the antenna in the communication device shown in the high-density medium. Figure 6 for Figure 2 and Figure 3 A schematic diagram showing the orthographic projection of the antenna onto the back cover and the orthographic projection of the high-density medium onto the back cover in the communication device shown. Figure 7 for Figures 1-3 The input return loss of the antenna of the communication device shown is as follows: when the communication device is not equipped with a high-density medium and when it is equipped with a high-density medium. Figure 8 for Figures 1-3The radiation patterns of the antenna at 26 GHz for the communication device shown are as follows: with and without a high-density medium. Figure 8 (a) in the diagram represents the antenna radiation pattern at 26 GHz when no high-density medium is used; Figure 8 (b) in the diagram represents the antenna radiation pattern at 26 GHz when a high-density medium is used; Figure 9 for Figures 1-3 The radiation patterns of the antenna at 28 GHz for the communication device shown are as follows: with and without a high-density medium. Figure 9 (a) in the diagram represents the antenna radiation pattern at 28 GHz when no high-density medium is used; Figure 9 (b) in the diagram represents the antenna radiation pattern at 28 GHz when a high-density medium is used; Figure 10 for Figures 1-3 The radiation pattern of the communication device shown at 26 GHz after the antenna reference layer size is optimized and a high-density medium is provided. Figure 11 for Figures 1-3 The radiation pattern of the communication device shown at 28 GHz after the antenna reference layer size is optimized and a high-density medium is provided. Figure 12 for Figures 1-3 The radiation pattern of the communication device shown at 26 GHz is obtained after optimizing the size of the antenna reference layer without setting a spectral density medium. Figure 13 for Figures 1-3 The radiation pattern of the communication device shown at 28 GHz is obtained after optimizing the size of the antenna reference layer without setting a high-density medium. Figure 14 A schematic diagram showing the relative positions of the middle plate, back cover, antenna, and spectral density medium within a communication device provided in some embodiments of this application; Figure 15 A schematic diagram showing the relative positions of the middle plate, back cover, antenna, and spectral density medium within a communication device provided in some embodiments of this application; Figure 16 A schematic diagram showing the relative positions of the middle plate, back cover, antenna, and spectral density medium within a communication device provided in some embodiments of this application; Figure 17 A schematic diagram showing the relative positions of the middle plate, back cover, antenna, and spectral density medium within a communication device provided in some embodiments of this application; Figure 18 This is a schematic diagram of the rear structure of a communication device provided in some embodiments of this application; Figure 19 for Figure 18 A schematic diagram of the cross-sectional structure of the communication device shown along the BB direction; Figure 20 A schematic diagram showing the relative positions of the inner plate, camera trim, antenna, and spectral density medium in a communication device provided for some embodiments of this application; Figure 21 A schematic diagram showing the relative positions of the inner plate, camera trim, antenna, and spectral density medium in a communication device provided for some embodiments of this application; Figure 22 This is a schematic diagram of the rear structure of a communication device provided in some embodiments of this application; Figure 23 for Figure 22 The diagram shows the structure of the communication device as viewed from direction D1. Figure 24 for Figure 22 The diagram shows the structure of the communication device as viewed from direction D2. Figure 25 for Figure 22 The diagram shows the structure of the communication device as viewed from direction D3. Figure 26 for Figure 22 The diagram shows the structure of the communication device as viewed from direction D4. Figure 27 This application provides a schematic diagram showing the relative positions of the antenna, the high-density medium, and the middle plate in a communication device for further embodiments; Figure 28 This application provides a schematic diagram showing the relative positions of the antenna, the spectral density medium, and the middle plate in a communication device for some other embodiments. Detailed Implementation

[0028] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0029] In order to improve the antenna gain without interfering with the antenna modularity, this application uses the Fabry-Perot effect (also known as the FP effect) to set a resonator in the antenna's transmission direction. This allows the antenna gain to be improved without changing the shape, material, or size of the existing modular antenna, thus without interfering with the initial performance of the modular antenna.

[0030] The embodiments of this application are described in detail below with reference to the accompanying drawings. Before describing the embodiments of this application, the application scenarios of the embodiments of this application will be introduced first.

[0031] This application provides a communication device, which is a type of communication device with wireless signal transmission and reception capabilities. Specifically, the communication device can be a portable electronic device or other suitable electronic device. For example, the communication device can be a mobile phone, base station, tablet personal computer, laptop computer, laptop computer, personal digital assistant (PDA), wearable device, etc. Among them, wearable devices include, but are not limited to, wristbands, watches, augmented reality (AR) glasses, AR headsets, virtual reality (VR) glasses, or VR headsets, etc.

[0032] Please see Figures 1-3 , Figure 1 This is a front structural diagram of a communication device 100 provided in some embodiments of this application. Figure 2 for Figure 1 A schematic diagram of the rear structure of the communication device 100 shown. Figure 3 for Figure 2 The diagram shows a cross-sectional view of the communication device 100 along the AA direction. This embodiment and subsequent embodiments use a mobile phone as an example for illustration; this should not be considered a specific limitation imposed on the communication device 100. The communication device 100 includes a screen 10, a back cover 20, a circuit board (not shown), and an antenna 30.

[0033] For the convenience of the description of the embodiments below, an XYZ coordinate system is established. Specifically, the length direction of the communication device 100 is defined as the Y-axis, the width direction as the X-axis, and the thickness direction as the Z-axis. It is understood that the coordinate system settings of the communication device 100 can be flexibly set according to actual needs, and are not specifically limited here.

[0034] Screen 10 is used to display images, videos, etc. Screen 10 includes a light-transmitting cover plate 11 and a display screen 12. The light-transmitting cover plate 11 is stacked and fixedly connected to the display screen 12. The light-transmitting cover plate 11 is mainly used to protect the display screen 12 and prevent dust. The material of the light-transmitting cover plate 11 includes, but is not limited to, glass. The display screen 12 can be a flexible display screen or a rigid display screen. For example, the display screen 12 can be an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode (MLED) display screen, a micro organic light-emitting diode (MLED) display screen, a quantum dot light-emitting diode (QLED) display screen, or a liquid crystal display (LCD).

[0035] The back cover 20 protects the internal electronic components of the communication device 100. The back cover 20 includes a back cover 21 and a frame 22. The back cover 21 is made of materials including, but not limited to, glass, plastics such as polycarbonate (PC), and ceramics. The back cover 21 is located on the side of the display screen 12 away from the light-transmitting cover plate 11 and is stacked with the light-transmitting cover plate 11 and the display screen 12. The frame 22 is located between the back cover 21 and the light-transmitting cover plate 11 and is fixed to the back cover 21. Exemplarily, the frame 22 can be fixed to the back cover 21 by adhesive. The frame 22 can also be integrally formed with the back cover 21, i.e., the frame 22 and the back cover 21 are a single integral structure. The light-transmitting cover plate 11 is fixed to the frame 22. In some embodiments, the light-transmitting cover plate 11 can be fixed to the frame 22 by adhesive. The light-transmitting cover plate 11, the back cover 21, and the frame 22 form an internal receiving space for the communication device 100. This internal receiving space houses the display screen 12.

[0036] In some embodiments, the communication device 100 further includes a middle plate 23. The middle plate 23 is disposed between the display screen 12 and the back cover 21, and the middle plate 23 is fixed to the inner surface of the frame 22. For example, the middle plate 23 can be glued to the frame 22, or the middle plate 23 can be integrally formed with the frame 22. The middle plate 23 is made of metal material, and the middle plate 23 can be used as a reference ground for electronic components within the communication device 100.

[0037] The circuit board is disposed within the internal accommodating space of the communication device 100. In some embodiments, the circuit board is located between the middle plate 23 and the back cover 21, and the circuit board is fixed on the middle plate 23. The circuit board can be a main circuit board or a secondary circuit board, and this application does not specifically limit it in this regard.

[0038] Antenna 30 is disposed within the internal housing space of communication device 100. In some embodiments, please refer to... Figure 3 Antenna 30 is located between the middle plate 23 and the back cover 21.

[0039] In some embodiments, the circuit board is provided with a radio frequency circuit, and the antenna 30 is electrically connected to the radio frequency circuit on the circuit board to transmit the radio frequency signal from the radio frequency circuit to the outside space in the form of electromagnetic waves to realize signal transmission; or to receive electromagnetic waves from the outside space and convert the electromagnetic waves into radio frequency signals and transmit them to the radio frequency circuit to realize signal reception.

[0040] Antenna 30 can be a directional antenna or an omnidirectional antenna. See also the following for some embodiments: Figure 3 The antenna 30 can transmit signals to the side of the back cover 21 away from the screen 10. Furthermore, the antenna 30 can also be used to receive electromagnetic wave signals from the side of the back cover 21 away from the screen 10. In some other embodiments, the antenna 30 can also transmit signals to the side of the frame 22 away from the internal accommodating space of the communication device 100, or to the side of the screen 10 away from the back cover 21. This embodiment uses the example of the antenna 30 transmitting signals to the side of the back cover 21 away from the screen 10 for illustration, and this should not be considered a special limitation of this application.

[0041] It should be noted that while transmitting signals to the side of the back cover 21 away from the screen 10, the antenna 30 can also transmit signals to other sides, such as the side of the frame 22 away from the internal space of the communication device 100, or the side of the screen 10 away from the back cover 21. No specific limitation is made here.

[0042] Antenna 30 includes, but is not limited to, Sub-6GHz band antennas, millimeter-wave (mmWave) band antennas, and terahertz (THz) band antennas. In some embodiments, antenna 30 is an mmWave band antenna. As one of the frequency bands for 5G mobile communication, the mmWave band offers advantages over the Sub-6GHz band, such as higher bandwidth, wider connectivity, and lower latency. However, mmWave band signals attenuate rapidly in space, necessitating increased gain to enhance the coverage of mmWave band communication devices (such as base stations or terminals). Furthermore, compared to the THz band, the mmWave band is less expensive, thus offering wider applicability. Specifically, when antenna 30 is an mmWave band antenna, its operating frequency band can be the n257 band (26.5 GHz-29.5 GHz), the n258 band (24.25 GHz-27.5 GHz), or the n260 band (37-40 GHz), without further specific limitations.

[0043] To improve the production efficiency of communication equipment, the antenna 30 can be supplied as a module. This facilitates management and improves the production efficiency of communication equipment containing the antenna 30. However, this approach makes it difficult to increase the gain of the antenna 30 by changing its shape, material, or size.

[0044] Based on the above, in order to improve the gain of antenna 30 while maintaining its modularity without interference, please refer to [link to relevant documentation]. Figure 2 and Figure 3 The communication equipment also includes a high-density medium 40.

[0045] The density medium 40 is a structure used to improve the gain of the antenna 30. In some embodiments, please refer to... Figure 3 The bromide medium 40 is in the shape of a rectangular sheet. In other embodiments, the bromide medium 40 may also be in the shape of a circular sheet, an elliptical sheet, a triangular sheet, or a polygonal sheet, etc.

[0046] The high-density medium 40 is located in the transmission direction of the antenna 30, and is spaced apart from the antenna 30. Specifically, the high-density medium 40 can be located between the antenna 30 and the back cover 21, or it can be disposed in the area on the back cover 21 opposite to the antenna 30, or it can be disposed on the side of the back cover 21 away from the antenna 30. In some embodiments, please refer to... Figure 3The high-density dielectric 40 is located between the antenna 30 and the back cover 21, and is disposed on the inner surface of the back cover 21. The inner surface of the back cover 21 refers to the surface of the back cover 21 facing the internal accommodating space of the communication device 100, that is, the surface of the back cover 21 closest to the screen 10. Specifically, the high-density dielectric 40 can be adhesively bonded to the inner surface of the back cover 21, or it can be directly molded onto the inner surface of the back cover 21 using the back cover 21 as a base; this embodiment does not specifically limit this.

[0047] The density medium 40 and the antenna 30 can be separated by a solid medium, by air, or by at least one layer of solid medium and at least one layer of air; no specific limitation is made here. In some embodiments, please refer to... Figure 4 , Figure 4 for Figure 3 The diagram shows the relative positions of the inner plate 23, back cover 21, antenna 30, and high-density medium 40 within the communication device 100. The high-density medium 40 and the antenna 30 are separated by air. This structure is simple, and air is inexpensive and easy to implement.

[0048] Within the communication device 100, the dielectric constant (DK, also known as the dielectric constant) of the medium located on the side of the dense medium 40 closer to the antenna 30, and the DK value of the medium located on the side of the dense medium 40 farther from the antenna 30, are both less than the DK value of the dense medium 40. Specifically, the medium located on the side of the dense medium 40 closer to the antenna 30 refers to the medium located on the side of the dense medium 40 closest to the antenna 30 and adjacent to the dense medium 40. Similarly, the medium located on the side of the dense medium 40 farther from the antenna 30 refers to the medium located on the side of the dense medium 40 farther from the antenna 30 and adjacent to the dense medium 40. For an example, please refer to [link to example]. Figure 4 The dielectric material on the side of the denser medium 40 closer to the antenna 30 is air, while the dielectric material on the side of the denser medium 40 farther from the antenna 30 is the back cover 21. That is, the dielectric constant (DK) of both air and the back cover 21 is less than that of the denser medium 40. Based on this, the material of the back cover 21 can be chosen to be plastic or glass, which have a lower DK value. Thus, compared to the denser medium 40, the dielectric material on the side of the denser medium 40 closer to the antenna 30 and the dielectric material on the side of the denser medium 40 farther from the antenna 30 have lower dielectric constants, classifying them as less dense dielectrics.

[0049] Please see Figure 5 , Figure 5 for Figure 4The diagram illustrates the transmission path of electromagnetic waves emitted by antenna 30 in the communication device 100 within a denser medium 40. Electromagnetic wave a emitted by antenna 30 enters the denser medium 40 via a less dense medium located on the side closer to antenna 30. After undergoing a first wave division, the transmitted electromagnetic wave is the first transmitted electromagnetic wave b, and the reflected electromagnetic wave is the first reflected electromagnetic wave c. The first transmitted electromagnetic wave b passes through the denser medium 40 and enters a less dense medium located on the side of the denser medium 40 away from antenna 30. After a second wave division, the transmitted electromagnetic wave is the second transmitted electromagnetic wave d, and the reflected electromagnetic wave is the second reflected electromagnetic wave e. The second reflected electromagnetic wave e then passes through the denser medium 40 in the opposite direction and enters a less dense medium located on the side of the denser medium 40 closer to antenna 30, transmitting the third transmitted electromagnetic wave f.

[0050] Based on the above embodiment, the thickness D of the dense medium 40 from the surface near the antenna 30 to the surface away from the antenna 30 satisfies: 0.5nλg(1-10%)≤D≤0.5nλg(1+10%). Where n=1,2,3,…,λg is the resonant wavelength of the operating frequency band of the antenna 30 in the dense medium 40.

[0051] in, . This is the resonant wavelength of the antenna 30 operating frequency band in a vacuum. , The speed at which electromagnetic waves travel in a vacuum. F represents the operating frequency band of antenna 30. F indicates a frequency range; for example, if the operating frequency band of antenna 30 is the n257 band, then F is 26.5GHz-29.5GHz. Based on this, It also refers to a wavelength range, specifically... / Upper limit within the F band range- The lower limit within the / F band range. Let D be the dielectric constant of the dense medium 40. Different materials will produce different values ​​for the dense medium 40. Therefore, λg is also a wavelength range. Thus, the thickness D satisfies the condition: 0.5nλg(1-10%)≤D≤0.5nλg(1+10%), which means the thickness D satisfies: 0.5nλg1(1-10%)≤D≤0.5nλg2(1+10%), where λg1 is the resonant wavelength of the upper limit frequency of the antenna 30's operating frequency band in the dense medium 40, and λg2 is the resonant wavelength of the lower limit frequency of the antenna 30's operating frequency band in the dense medium 40.

[0052] In this way, the thickness D of the dense medium 40 is an integer multiple of half the wavelength of the antenna 30 in the dense medium 40. The dense medium 40 forms a Fabry-Perot resonator. Electromagnetic waves reflect from the less dense medium to the dense medium with a 180° phase difference and transmit with a 0° phase difference; they also reflect from the dense medium to the less dense medium with a 0° phase difference and transmit with a 0° phase difference. That is, there is a 180° phase difference between the first reflected electromagnetic wave c and electromagnetic wave a, and there are 0° phase differences between electromagnetic wave a and the first transmitted electromagnetic wave b, between the first transmitted electromagnetic wave b and the second reflected electromagnetic wave e, and between the second reflected electromagnetic wave e and the third transmitted electromagnetic wave f. Therefore... Figure 5 The phase difference between the first reflected electromagnetic wave b and the third transmitted electromagnetic wave f is exactly 180°, which results in phase cancellation of interference. Therefore, the Fabry-Perot resonator can achieve a transmission enhancement effect and improve the gain of the antenna 30.

[0053] In some embodiments, n=1. This results in a smaller thickness D of the baud rate medium 40, enabling installation within space-constrained communication devices and achieving a thinner form factor.

[0054] In some embodiments, the thickness D of the high-density dielectric 40 can be less than or equal to 2 mm. This facilitates the installation of the high-density dielectric 40 within space-constrained communication equipment, ensuring the thinness of the communication equipment. Optionally, the thickness D of the high-density dielectric 40 can also be greater than or equal to 0.1 mm. This ensures the structural strength of the high-density dielectric 40 without compromising the thinness of the communication equipment, facilitating its installation within the communication equipment. Specifically, the thickness D of the high-density dielectric 40 can be 0.1 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2.0 mm.

[0055] To achieve the above objectives, when antenna 30 is a mmWave band antenna (e.g., n257 band: 26.5-29.5GHz; n258 band: 24.25-27.5GHz; n260 band: 37-40GHz), the DK value of the density medium 40 can be greater than or equal to 14 and less than or equal to 40. Thus, when n=1 and antenna 30 is a mmWave band antenna, the operating frequency of antenna 30 is between 24GHz and 40GHz, and the thickness D of the density medium 40 is approximately 1mm. This ensures the structural strength of the density medium 40 without compromising the thinness of the communication equipment.

[0056] In some embodiments, the material of the PWM medium 40 includes, but is not limited to, zirconia ceramic and alumina ceramic. The dielectric constant DK of zirconia ceramic and alumina ceramic can reach 26-35. When n=1, the thickness D of the PWM medium 40 is about 1mm, which can ensure the structural strength of the PWM medium 40 without affecting the thinness of the communication device.

[0057] In some embodiments, please refer to Figure 4 The distance between the dense medium 40 and the antenna 30 (i.e., the height h of the air gap) is greater than 0 mm and less than 10 mm. This minimizes the impact on the thinness of the communication device 100 while ensuring a better gain improvement for the antenna 30. Further optionally, the height h is greater than 0.02 mm and less than 3 mm. This minimizes the impact on the thinness of the communication device 100 while further enhancing the gain improvement of the antenna 30. Further optionally, the height h is greater than or equal to 0.5 mm and less than or equal to 1 mm. This minimizes the impact on the thinness of the communication device 100 while further enhancing the gain improvement of the antenna 30.

[0058] In some embodiments, the orthographic projection of the antenna 30 onto the back cover 21 is a first projection, and the orthographic projection of the dense medium 40 onto the back cover 21 is a second projection, with the first and second projections overlapping. Thus, the dense medium 40 is located in the transmission direction of the antenna 30 and directly opposite the antenna 30, which can improve the gain of the antenna 30. The overlap between the first and second projections indicates that: a portion of the first projection overlaps with a portion of the second projection; or, the entire first projection overlaps with a portion of the second projection; or, a portion of the first projection overlaps with the entire second projection; or, the entire first projection overlaps with the entire second projection.

[0059] In some embodiments, the area of ​​the second projection is larger than the area of ​​the first projection, and the edge of the second projection is located outside the edge of the first projection, with the edge of the second projection and the edge of the first projection spaced apart.

[0060] For an example, please refer to Figures 1-3 Antenna 30 is in the shape of a rectangular plate, and the high-density dielectric 40 is in the shape of a rectangular sheet. Please refer to [link / reference]. Figure 6 , Figure 6 for Figure 2 and Figure 3The diagram illustrates the orthographic projection of the antenna 30 onto the back cover 21 (i.e., the first projection O1) and the orthographic projection of the dense medium 40 onto the back cover 21 (i.e., the second projection O2) in the communication device 100. Both the first projection O1 and the second projection O2 are rectangular. The length direction of the first projection O1 is the same as the length direction of the second projection O2, and the width direction of the first projection O1 is the same as the width direction of the second projection O2. The first projection O1 is located within the second projection O2. The length L1 of the first projection O1 is less than the length L2 of the second projection O2, and the width W1 of the first projection O1 is less than the width W2 of the second projection O2. The edge C1 of the first projection O1 and the edge C2 of the second projection O2 are spaced apart. In this way, the size of the dense medium 40 exceeds the size of the antenna 30, allowing the dense medium 40 to cover the antenna 30 and maximizing the gain of the antenna 30.

[0061] Based on the above description, to verify the effect of the high-density dielectric 40 on the gain of the antenna 30, please refer to [link / reference needed]. Figure 7 , Figure 7 for Figures 1-3 The diagram illustrates the input return loss S11 of antenna 30 when the communication device 100 is equipped with and without a high-density medium 40. Specifically, S11_noFP represents the input return loss of antenna 30 when the communication device 100 is not equipped with a high-density medium 40; S11_0.25λg represents the input return loss of antenna 30 when the communication device 100 is equipped with a high-density medium 40 and the thickness of the high-density medium 40 is 0.25λg; S11_0.5λg represents the input return loss of antenna 30 when the communication device 100 is equipped with a high-density medium 40 and the thickness of the high-density medium 40 is 0.5λg; and S11_0.75λg represents the input return loss of antenna 30 when the communication device 100 is equipped with a high-density medium 40 and the thickness of the high-density medium 40 is 0.75λg. Figure 5 It can be seen that when the thickness of the dense medium 40 is far from 0.5λg, the S11 of the antenna 30 deteriorates significantly. When the thickness of the dense medium 40 is close to 0.5λg, although the bandwidth narrows, S11 can still be guaranteed to be <-10dB at the resonant frequency. This shows that the dense medium 40 has a wave-transmitting effect and can improve the gain of the antenna 30.

[0062] Please see Figure 8 , Figure 8 for Figures 1-3 The radiation pattern of antenna 30 at 26 GHz is shown for the communication device 100 with and without the high-density medium 40. Specifically, Figure 8 (a) in the diagram represents the radiation pattern of antenna 30 at 26 GHz when the spectral density medium 40 is not provided; Figure 8(b) in the figure represents the radiation pattern of antenna 30 at 26 GHz when a dense medium 40 is provided, wherein the thickness of the dense medium 40 is close to 0.5λg. Figure 8 In (a) of the diagram, when the spectral density medium 40 is not set, the gain of the antenna 30 is 3.6 dBi. Figure 8 In (b) of the diagram, when the dense medium 40 is provided, the gain of the antenna 30 is 7.8 dBi, which is an increase of about 4.2 dBi.

[0063] Please see Figure 9 , Figure 9 for Figures 1-3 The radiation patterns of antenna 30 at 28 GHz are shown for the communication device 100 with and without the high-density medium 40. Specifically, Figure 9 (a) in the diagram represents the radiation pattern of antenna 30 at 28 GHz when the spectral density medium 40 is not installed; Figure 9 (b) in the figure represents the radiation pattern of antenna 30 at 28 GHz when a dense medium 40 is provided, wherein the thickness of the dense medium 40 is close to 0.5λg. Figure 9 In (a) of the diagram, when the spectral density medium 40 is not set, the gain of the antenna 30 is 3.7 dBi. Figure 8 In (b) of the diagram, when the dense medium 40 is provided, the gain of the antenna 30 is 8.1 dBi, which is an increase of about 4.4 dBi.

[0064] because Figures 1-3 In the communication device 100 shown, the size of the dense medium 40 exceeds the size of the antenna 30, and the size of the reference ground layer within the modular antenna 30 is less than or equal to the size of the antenna 30. Therefore, the size of the dense medium 40 exceeds the size of the reference ground layer within the antenna 30. Based on this, the size of the reference ground layer can be increased to direct the energy of the electromagnetic field extended within the dense medium 40 as far away from the reference ground layer as possible, thereby further improving the gain of the antenna 30. To optimize the size of the reference ground layer of the antenna 30 without affecting its modularity, in some embodiments, the reference ground layer of the antenna 30 can be electrically connected to a larger-sized middle plate 23 or a reference ground layer within a circuit board to increase the size of the reference ground layer of the antenna 30, thereby further improving the gain of the antenna 30.

[0065] Please see Figure 10 and Figure 11 , Figure 10 for Figures 1-3 The communication device 100 shown is equipped with a high-density medium 40, and the size of the reference ground layer of the antenna 30 is optimized. The radiation pattern of the antenna 30 at 26 GHz is shown below. Figure 11 for Figures 1-3The radiation pattern of the communication device 100 at 28 GHz is shown after the communication device 100 is equipped with a high-density medium 40 and the size of the reference ground layer of the antenna 30 is optimized. Figure 10 and Figure 11 As can be seen, after setting the density medium 40 and optimizing the size of the reference layer of antenna 30, the gain of antenna 30 is increased from 7.8 dBi to 14.1 dBi at 26 GHz and from 8.1 dBi to 17.8 dBi at 28 GHz. This further improves the gain of antenna 30.

[0066] It should be noted that when optimizing the size of the reference layer for the antenna 30 with no dielectric 40, please refer to [reference needed]. Figure 12 and Figure 13 , Figure 12 for Figures 1-3 The communication device 100 shown does not have a high-density medium 40, but after optimizing the size of the reference ground layer of the antenna 30, the radiation pattern of the antenna 30 at 26 GHz is shown. Figure 13 for Figures 1-3 The radiation pattern of the communication device 100 at 28 GHz is shown after optimizing the size of the reference ground layer of the antenna 30 without setting the wavelength density medium 40. Figure 12 and Figure 13 It can be seen that the gain slightly increased after optimizing the size of the reference ground layer of antenna 30. Specifically, the gain of antenna 30 increased from 3.6 dBi to 3.8 dBi at 26 GHz and from 3.7 dBi to 4.0 dBi at 28 GHz, but the radiation pattern also showed distortion. Therefore, it can be concluded that further optimization of the size of the reference ground layer of antenna 30, in addition to setting the wavelength density medium 40, is necessary to achieve a significant increase in gain.

[0067] The above embodiments illustrate an example where the antenna 30 can transmit signals to the side of the back cover 21 away from the screen 10, and the high-density medium 40 is disposed on the inner surface of the back cover 21. As described above, the high-density medium 40 can also be disposed in the area on the back cover 21 opposite to the antenna 30, or on the side of the back cover 21 away from the antenna 30. Furthermore, the antenna 30 can also transmit signals to the side of the frame 22 away from the internal accommodating space of the communication device 100, or to the side of the screen 10 away from the back cover 21. Based on this, the high-density medium 40 can be disposed on the inner surface of the frame 22 or the screen 10, in the area opposite to the antenna 30, or on the side away from the antenna 30.

[0068] Please see Figure 14 , Figure 14This is a schematic diagram showing the relative positions of the inner plate 23, back cover 21, antenna 30, and high-density medium 40 within a communication device 100 provided in some embodiments of this application. In this embodiment, the high-density medium 40 is embedded in the area of ​​the back cover 21 opposite to the antenna 30. This reduces the thickness of the communication device, which is beneficial for making the communication device thinner.

[0069] In the above embodiments, the hole on the back cover 21 for embedding the high-density medium 40 can be a blind hole or a through hole. When the hole on the back cover 21 for embedding the high-density medium 40 is a blind hole, the blind hole can penetrate the inner surface of the back cover 21 but not the outer surface, or it can penetrate the outer surface of the back cover 21 but not the inner surface; no specific limitation is made here. When the hole on the back cover 21 for embedding the high-density medium 40 is a blind hole, and the blind hole penetrates the inner surface of the back cover 21 but not the outer surface, a portion of the high-density medium 40 is located on the inner side of the back cover 21, and the other portion is embedded in the blind hole. When the hole on the back cover 21 for embedding the high-density medium 40 is a blind hole, and the blind hole penetrates the outer surface of the back cover 21 but not the inner surface, a portion of the high-density medium 40 is located on the outer side of the back cover 21, and the other portion is embedded in the blind hole.

[0070] When the hole on the back cover 21 for embedding the high-density medium 40 is a through hole, the surface of the high-density medium 40 away from the antenna 30 can be flush with the outer surface of the back cover 21 or protrude to the outside of the back cover 21. Figure 14 In the illustrated embodiment, the surface of the high-density medium 40 away from the antenna 30 is flush with the outer surface of the back cover 21. This improves the aesthetic appearance of the communication device 100.

[0071] In the above embodiments, the outer surface of the back cover 21 refers to the surface of the back cover 21 that is away from the internal accommodating space of the communication device 100, that is, the surface of the back cover 21 that is away from the screen 10. The outer side of the back cover 21 refers to the side of the outer surface of the back cover 21 that is away from the inner surface of the back cover 21. Correspondingly, the inner side of the back cover 21 refers to the side of the inner surface of the back cover 21 that is away from the outer surface of the back cover 21.

[0072] When the hole on the back cover 21 for embedding the denser medium 40 is a through hole, the less dense medium on the side of the denser medium 40 closer to the antenna 30 is air, and the less dense medium on the side of the denser medium 40 farther from the antenna 30 is also air. The dielectric constant DK of air is small, approximately 1, and has little effect on the FP effect of the denser medium 40.

[0073] Please see Figure 15 , Figure 15This is a schematic diagram showing the relative positions of the inner plate 23, back cover 21, antenna 30, and wave density medium 40 within a communication device 100 provided in some embodiments of this application. In this embodiment, the wave density medium 40 includes a first portion 41 and a second portion 42. The first portion 41 is formed by a portion of the back cover 21. The second portion 42 is located between the first portion 41 and the antenna 30, and is disposed on the surface of the first portion 41 near the antenna 30 (i.e., the inner surface of the first portion 41). Thus, the sum of the thicknesses of the first portion 41 and the second portion 42 is equal to the thickness D of the wave density medium 40, which also facilitates the thinning of the communication device. Furthermore, since the second portion 42 is disposed on the surface of the first portion 41 near the antenna 30, it does not affect the appearance of the communication device.

[0074] In some other embodiments, the second portion 42 may also be disposed on the surface of the first portion 41 that is away from the antenna 30 (i.e., the outer surface of the first portion 41). Alternatively, see [link to relevant documentation]. Figure 16 , Figure 16 This is a schematic diagram showing the relative positions of the inner plate 23, back cover 21, antenna 30 and wave density medium 40 in a communication device 100 provided in some embodiments of this application. In this embodiment, a portion of the second part 42 is disposed on the inner surface of the first part 41, and another portion is disposed on the outer surface of the first part 41.

[0075] In some embodiments, please continue reading Figure 16 The first part 41 and the second part 42 are integrally formed. This reduces the complexity of the communication equipment's structure and improves assembly efficiency.

[0076] exist Figure 15 and Figure 16 In the illustrated embodiment, the less dense medium on the side of the dense medium 40 closer to the antenna 30 is air, and the less dense medium on the side of the dense medium 40 farther from the antenna 30 is also air. Air has a relatively small dielectric constant DK, approximately 1, and therefore has a relatively small impact on the FP effect of the dense medium 40.

[0077] Please see Figure 17 , Figure 17 This is a schematic diagram showing the relative positions of the middle plate 23, back cover 21, antenna 30, and frequency density medium 40 within a communication device 100 provided in some embodiments of this application. In this embodiment, the frequency density medium 40 is located on the side of the back cover 21 away from the antenna 30, that is, the frequency density medium 40 is located on the outer side of the back cover 21. Specifically, the frequency density medium 40 is disposed on the outer surface of the back cover 21. In this way, the frequency density medium 40 does not occupy the internal storage space of the communication device, and can avoid compressing the installation space of other components within the communication device.

[0078] In the above embodiment, the less dense medium located on the side of the dense medium 40 closer to the antenna 30 is the back cover 21, and the less dense medium located on the side of the dense medium 40 farther from the antenna 30 is air. Optionally, the back cover 21 can be made of plastic or glass. Plastic and glass have lower dielectric constants, thus having a smaller impact on the FP effect of the dense medium 40.

[0079] Please see Figure 18 , Figure 18 This is a schematic diagram of the rear structure of a communication device 100 provided in some embodiments of this application. In this embodiment, the communication device 100 further includes a camera decorative element 50, which is disposed on the back cover 21. In some embodiments, the signal transmission direction of the antenna 30 is directed towards the camera decorative element 50. Based on this, please refer to... Figure 19 , Figure 19 for Figure 18 The diagram shows a cross-sectional view of the communication device 100 along the BB direction. The camera decorative element 50 includes a decorative element body 51 and a light-transmitting plate 52 disposed on the side of the decorative element body 51 away from the antenna 30. The decorative element body 51 has a first mounting hole 51a. A portion of the wavelength density medium 40 is located on the side of the camera decorative element 50 closer to the antenna 30, and the other portion of the wavelength density medium 40 is installed in the first mounting hole 51a of the decorative element body 51. In this way, the thickness of the communication device 100 can be reduced to a certain extent, while ensuring the appearance consistency of the camera decorative element 50.

[0080] Please see Figure 20 , Figure 20 This is a schematic diagram showing the relative positions of the inner plate 23, camera decorative element 50, antenna 30, and wavelength density medium 40 within a communication device 100 provided in some embodiments of this application. In this embodiment, the decorative element body 51 has a first mounting hole 51a, and the light-transmitting plate 52 has a second mounting hole 52a. A portion of the wavelength density medium 40 is mounted in the first mounting hole 51a of the decorative element body 51, a portion of the wavelength density medium 40 is mounted in the second mounting hole 52a of the light-transmitting plate 52, and the remaining portion of the wavelength density medium 40 is located on the side of the camera decorative element 50 closer to the antenna 30. This significantly reduces the thickness of the communication device 100.

[0081] Please see Figure 21 , Figure 21This is a schematic diagram showing the relative positions of the inner plate 23, camera trim 50, antenna 30, and wavelength density medium 40 within a communication device 100 according to some embodiments of this application. In this embodiment, the wavelength density medium 40 is located on the side of the camera trim 50 furthest from the antenna 30, that is, the wavelength density medium 40 is located on the outer side of the camera trim 50. Specifically, the wavelength density medium 40 is disposed on the outer surface of the camera trim 50. In this way, the wavelength density medium 40 does not occupy the internal storage space of the communication device, thus avoiding compression of the installation space of other components within the communication device.

[0082] When antenna 30 transmits a signal toward the side of frame 22 that is away from the internal housing space of communication device 100, please refer to Figure 22 , Figure 22 This is a schematic diagram of the rear structure of a communication device 100 provided in some embodiments of this application. The frame 22 includes a lower frame 221, a left frame 222, a right frame 223, and a top frame 224. Please refer to... Figure 23 , Figure 23 for Figure 22 The diagram shows the structure of the communication device 100 as viewed from direction D1. In this embodiment, the antenna 30 transmits signals to the side of the lower frame 221 away from the internal accommodating space of the communication device 100. The wave density medium 40 is disposed on the inner surface of the lower frame 221, embedded in the lower frame 221, integrally formed with the lower frame 221, or disposed on the outer surface of the lower frame 221. In other embodiments, please refer to... Figures 24-26 , Figure 24 for Figure 22 A schematic diagram of the communication device 100 as seen from direction D2; Figure 25 for Figure 22 A schematic diagram of the communication device 100 as viewed from direction D3; Figure 26 for Figure 22 The diagram shows the structure of the communication device 100 as viewed from direction D4. The antenna 30 can also transmit signals to the side of the left frame 222, right frame 223, or top frame 224 away from the internal accommodating space of the communication device 100. In this way, the wave density medium 40 is disposed on the inner surface of the left frame 222, right frame 223, or top frame 224, embedded in the left frame 222, right frame 223, or top frame 224, or disposed on the outer surface of the left frame 222, right frame 223, or top frame 224.

[0083] In the communication devices described in the above embodiments, the number of antennas 30 can be one or more, and the multiple antennas 30 are arranged in an array. When the number of antennas 30 is multiple, a wavelength density medium 40 can be provided for each antenna 30 separately, or the same wavelength density medium 40 can be provided for the multiple antennas 30. The wavelength density medium 40 can cover the multiple antennas 30 to improve the gain of the multiple antennas 30, and no specific limitation is made here.

[0084] For an example, please refer to Figure 27 , Figure 27 This application provides a schematic diagram showing the relative positions of the antenna 30, the wave density medium 40, and the middle plate 23 in a communication device 100 according to some embodiments. There are multiple antennas 30, integrated within the same carrier medium 31. In some embodiments, the carrier medium 31 can be formed by alternating and stacking insulating dielectric layers and metal layers, with the antenna 30 formed by metal layers within the carrier medium 31 and metallized vias connecting the multiple metal layers. Each antenna 30 corresponds to one wave density medium 40, and the wave density media 40 corresponding to multiple antennas 30 are independent of each other. This results in a smaller volume and lower cost for a single wave density medium 40.

[0085] For another example, please refer to Figure 28 , Figure 28 This application provides a schematic diagram showing the relative positions of the antenna 30, the high-density medium 40, and the middle plate 23 in a communication device 100 according to some embodiments. There are multiple antennas 30, which are integrated within the same carrier medium 31. Each antenna 30 corresponds to the same high-density medium 40, which covers all antennas 30 to improve their gain. This results in a smaller number of high-density mediums 40, lower structural complexity of the communication device, easier assembly, and higher efficiency.

[0086] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A communication device, characterized by The communication device includes a back cover, an antenna, and a high-density medium. The antenna is a millimeter-wave band antenna, located inside the back cover. The high-density medium is located in the transmission direction of the antenna and is spaced apart from the antenna. The dielectric constant of the medium located on the side of the wave density medium closer to the antenna within the communication device is less than the dielectric constant of the wave density medium. The dielectric constant of the medium located on the side of the wave density medium away from the antenna within the communication device is less than the dielectric constant of the wave density medium. The thickness of the dense medium from the surface near the antenna to the surface away from the antenna is D, where 0.5nλg(1-10%)≤D≤0.5nλg(1+10%), n=1,2,3…, and λg is the resonant wavelength of the antenna's operating frequency band in the dense medium.

2. The communication device of claim 1, wherein, D≤2mm.

3. The communication device of claim 2, wherein, D≥0.1mm.

4. The communication device of claim 3, wherein, The dielectric constant of the dielectric medium is greater than or equal to 14 and less than or equal to 40.

5. The communication device of claim 4, wherein, The material of the bromide medium is zirconia ceramic or alumina ceramic.

6. The communication device according to any one of claims 1 to 5, characterized by n=1。 7. The communication device according to any one of claims 1 to 6, characterized by An air gap separates the antenna from the dense medium, and the air gap forms a medium within the communication device located on the side of the dense medium closer to the antenna.

8. The communication device of claim 7, wherein, The distance between the antenna and the high-density medium is greater than 0 mm and less than 10 mm.

9. The communication device according to claim 7 or 8, characterized by The spectral density medium is located between the antenna and the back cover and is disposed on the inner surface of the back cover. The back cover forms a medium within the communication device located on the side of the spectral density medium away from the antenna.

10. The communication device according to claim 7 or 8, characterized by The high-density medium is embedded in the area on the back cover opposite to the antenna.

11. The communication device according to claim 7 or 8, characterized in that, The diametric medium includes a first part and a second part, wherein the first part is formed by a portion of the back cover; The second part is located between the first part and the antenna, and the second part is disposed on the inner surface of the first part; Alternatively, the second portion may be located on the side of the first portion away from the antenna, and the second portion may be disposed on the outer surface of the first portion; Alternatively, a portion of the second part may be located between the first part and the antenna and disposed on the inner surface of the first part, while another portion may be located on the side of the first part away from the antenna and disposed on the outer surface of the first part.

12. The communication device according to claim 11, characterized in that, The first part and the second part are integrally formed.

13. The communication device according to any one of claims 1-6, characterized in that, The diaphragm medium is located on the outside of the back cover, and the diaphragm medium is disposed on the outer surface of the back cover.

14. The communication device according to any one of claims 1-13, characterized in that, The orthographic projection of the antenna onto the back cover is the first projection, and the orthographic projection of the density medium onto the back cover is the second projection. The area of ​​the second projection is larger than the area of ​​the first projection, and the edge of the second projection is located outside the edge of the first projection, with the edge of the second projection and the edge of the first projection spaced apart.

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