Dual-frequency dual-circularly polarized antenna device and communication terminal provided with same

Abstract

The invention provides a dual-band dual-circularly polarized antenna device and a communication terminal provided with the same, and the antenna device employs a first band antenna unit, a second band antenna unit and a polarization unit which are arranged in a coplanar manner. The beam directions of the first frequency band antenna and the second frequency band antenna are deflected to the end-fire direction from the back-fire direction by additionally arranging the polarization units, so that the directivity of the antenna unit is improved, the gain axial ratio performance of the antenna unit is improved, the signal receiving and transmitting efficiency is optimized, and meanwhile, the arrangement and cooperation flexibility of each unit in the antenna device is also improved. Furthermore, the antenna device provided by the invention can maintain the low-profile characteristic while maintaining better antenna performance, so that the antenna device can be placed on the back, far away from a screen and an end frame when being applied to the communication terminal, and the antenna device can coexist with antenna devices with other functions while ensuring that good satellite communication performance is realized; and the application scenarios of the antenna device in the communication terminal are enriched.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic radiation technology, and more specifically, to a dual-frequency dual-circular polarization antenna device and a communication terminal equipped with the same. Background Art

[0002] Antennas are basic devices for receiving and sending radio waves and are an essential part of wireless communication systems. Circularly polarized antennas are widely used in mobile communications, base station positioning, and other fields because they have good resistance to multipath effects and interference from weather factors such as rain and fog. Currently, mobile phones on the market that can achieve satellite communications use communications with high-orbit satellites, which have long communication paths and large losses. Due to the small interior of mobile phones suitable for 5G communications, a large number of antennas need to be deployed to achieve various functions. In order to avoid mutual interference between antennas or to avoid interference of antenna functions by other parts of the device, such as batteries and screens, many mobile phones design antennas on the frame of the body, usually in certain areas of the metal frame, especially the top, bottom or side areas of the phone, to provide better wireless signal coverage.

[0003] The overly limited installation space means that the antenna device used for satellite communication does not have an independent and ideal space to arrange conventional circularly polarized antennas, so only linearly polarized antennas can be used, or circularly polarized antennas can be used but their axial ratio parameters are not ideal, and their performance is almost equivalent to linear polarization, which greatly limits the performance design of satellite communication antennas in mobile phones. For example, in the Chinese invention patent application CN 116053760 A, a communication terminal is mentioned, on which the circular polarization axial ratio of the satellite communication antenna set is less than or equal to 10dB in the working frequency band, and the antenna's transceiver gain is around -6dBi or -7dBi, and the antenna performance is not ideal; at the same time, the antenna in the patent is placed in the upper right corner of the mobile phone, and other antennas are also set at this position, which requires the antennas to overcome the large coexistence interference problem.

[0004] Therefore, it is necessary to design the structure and application functions of the antenna for satellite communication reception and transmission according to the actual application environment of mobile phone products, and to provide a dual-frequency dual circularly polarized satellite communication antenna product with good axial ratio parameters, good antenna gain, and easy coexistence with other antennas. Summary of the invention The present invention aims to overcome at least one of the above-mentioned deficiencies of the prior art and provides a dual-frequency dual-circular polarization antenna device and a communication terminal equipped with the same.

[0005] An object of the present invention is to provide a dual-frequency dual-circular polarization antenna device, comprising a first frequency band antenna unit, a second frequency band antenna unit and a polarization unit arranged in a coplanar manner; The first frequency band antenna unit and the second frequency band antenna unit are arranged in parallel in the horizontal direction, the polarization unit and the first frequency band antenna unit and the second frequency band antenna unit are arranged in parallel in the vertical direction, and there is a gap between the first frequency band antenna unit, the second frequency band antenna unit and the polarization unit; The first-band antenna unit uses a first radiation patch to achieve right-hand circular polarization, and the second-band antenna unit uses a second radiation patch to achieve left-hand circular polarization; the polarization unit uses a polarization metal sheet, and the polarization unit is used to deflect the beam direction of the first-band antenna unit and the second-band antenna unit from the backfire direction to the endfire direction.

[0006] In the present technical solution, the designed satellite communication antenna device adopts a coplanarly arranged first frequency band antenna unit, a second frequency band antenna unit and a polarization unit, so that the first frequency band antenna unit, the second frequency band antenna unit and the polarization unit are closely matched in physical layout, which can effectively save layout space while providing balanced performance; at the same time, due to the gaps between the units, a decoupling design between the units is realized, thereby improving the working stability and signal clarity of each unit in the antenna device. Furthermore, the antenna device realizes a wider range of satellite communications and more efficient data transmission by adopting a patch antenna to realize a dual-band dual circular polarization design, and meets the needs of stable communication in different frequency bands; specifically, by setting the first frequency band antenna unit and the second frequency band antenna unit to adopt radiating patch antennas, while maintaining the low-profile design of the dual-band antenna units, the circular polarization performance can be easily achieved by adjusting the shape and size of the corresponding radiating patches, thereby greatly improving the gain and axial ratio of the antenna unit; secondly, by setting the first frequency band antenna unit to realize right-hand circular polarization by adopting the first radiating patch, and the second frequency band antenna unit to realize left-hand circular polarization by adopting the second radiating patch, the antenna units of the two adjacent frequency bands are made to form circular polarizations with inconsistent rotation directions, thereby improving the isolation between the antenna units of the two frequency bands, thereby effectively avoiding signal interference between the antenna units, and improving the stability and reliability of satellite communications. Furthermore, by setting a polarization unit, the propagation direction of the signals generated by the first frequency band antenna unit and the second frequency band antenna unit can be accurately controlled. The polarization unit adopts a polarization metal sheet to deflect the beam direction of the first frequency band and the second frequency band antenna from the backfire direction to the endfire direction. By adding separate polarization units to control the propagation direction of the signal, not only the directivity of the antenna unit can be improved, the gain axis ratio performance of the antenna unit can be improved, and the efficiency of signal reception and transmission can be optimized, but also the flexibility of setting and coordinating the units in the antenna device can be improved, thereby expanding the application scope of the antenna device.

[0007] Furthermore, the polarization unit adopts a rectangular polarizing metal plate, and the first radiation patch and the second radiation patch both adopt rectangular radiation patches; the first radiation patch and the second radiation patch are flush with one end close to the rectangular polarizing metal plate; the side length of the rectangular polarizing metal plate close to one end of the first radiation patch and the second radiation patch is not less than the horizontal setting distance between the first radiation patch and the second radiation patch. In the present technical solution, the propagation direction of the signals generated by the first frequency band antenna unit and the second frequency band antenna unit is controlled and adjusted by the polarization unit. Since the first frequency band antenna unit and the second frequency band antenna unit both adopt patch antennas, the effective radiation area of ​​the patch antenna is mainly determined by the physical size of its radiation patch. By setting the side length of the rectangular polarized metal sheet close to one end of the first radiation patch and the second radiation patch to be not less than the horizontal setting distance of the first radiation patch and the second radiation patch, it can be ensured that the rectangular polarized metal sheet covers the radiation area of ​​the first frequency band antenna unit and the second frequency band antenna unit, which helps to maintain consistent polarization characteristics. At the same time, it can also effectively shield some waves that do not conform to a specific polarization direction, thereby improving the polarization selectivity of the antenna device, making the antenna device more directional for receiving or transmitting signals in the first frequency band and the second frequency band, thereby improving the signal quality and transmission efficiency.

[0008] Furthermore, a plurality of metal gaps are provided on the polarizing metal sheet; by providing metal gaps on the polarizing metal sheet, the isolation between the antenna units of the first frequency band and the second frequency band is improved, signal interference between the antenna units of the first frequency band and the second frequency band is avoided, and the working stability and signal clarity of each unit in the antenna device are improved; at the same time, providing metal gaps on the polarizing metal sheet can change the action mode and radiation characteristics of the polarizing metal sheet on electromagnetic waves, further improving the polarization selectivity of the antenna device, making the antenna device more directional for receiving or transmitting signals in the first frequency band and the second frequency band, further improving the gain and axial ratio performance of the antenna units of the first frequency band and the second frequency band, and improving the signal quality and transmission efficiency.

[0009] Preferably, in order to further improve the isolation between the antenna units of the first frequency band and the second frequency band, avoid signal interference between the antenna units of the first frequency band and the second frequency band, and improve the working stability and signal clarity of each unit in the antenna device, an isolation metal sheet is provided in the gap between the first radiation patch and the second radiation patch, and the isolation metal sheet is provided in parallel with the first radiation patch and the second radiation patch and is not connected to each other. Preferably, in order to improve the compactness of the antenna device, reduce the space size, and facilitate impedance matching, the size of the isolation metal sheet is set to be no larger than any one of the first radiation patch and the second radiation patch.

[0010] Another object of the present invention is to provide a communication terminal, comprising: a frame, a screen and a back plate, wherein the screen and the back plate are arranged oppositely and parallel to each other, the frame surrounds and connects the edges of the screen and the back plate, and a receiving cavity is constructed between the frame, the screen and the back plate; The accommodating cavity is provided with a dual-frequency dual-circular polarization antenna device according to the technical solution, the first frequency band antenna unit is an uplink antenna unit, and the second frequency band antenna unit is a downlink antenna unit; The first radiation patch, the second radiation patch and the polarizing metal sheet are arranged on the back plate, and the polarizing metal sheet is arranged close to the top edge of the back plate.

[0011] In the present technical scheme, the dual-frequency dual-circularly polarized antenna device provided in the present technical scheme is used as an antenna device for realizing satellite communication in a communication terminal, and the first frequency band antenna unit is set as an uplink antenna unit, and the second frequency band antenna unit is set as a downlink antenna unit. By covering the antenna units with dual frequency band settings, the two-way communication requirements of the communication terminal are realized, and the dual circular polarization of the uplink antenna unit and the downlink antenna unit is realized by adopting patch antennas; further, by controlling the shape and size of the radiation patches in the uplink antenna unit and the downlink antenna unit, the uplink antenna unit realizes right-hand circular polarization, and the downlink antenna unit realizes left-hand circular polarization, which not only broadens the bandwidth of the antenna unit, but also improves the isolation between the uplink and downlink antenna units, effectively avoids signal interference between the antenna units, and improves the gain and axial ratio of the antenna unit, thereby ensuring the frequency stability and reliability of uplink and downlink communications. Furthermore, the antenna unit and the deflection unit can be coplanarly arranged on the back panel of the communication terminal, and the polarization metal sheet is arranged close to the top edge of the back panel. Not only is the isolation between the uplink and downlink antenna units further improved by introducing the deflection metal sheet between the patch antennas, the gain and axial ratio of the antenna unit are improved, but also the beam propagation direction of the antenna unit is adjusted so that the signal propagation direction can be propagated along the end, which can better connect to the satellite. At the same time, since the antenna device is placed on the back of a communication terminal such as a mobile phone, away from the screen and the end frame, the back space of the communication terminal is fully utilized, and the frame position is not competed with antenna devices that realize other functions, which enriches the application scenarios of the antenna device in communication terminals such as mobile phones. At the same time, when using the communication terminal for calls, the head can be effectively prevented from affecting the antenna device.

[0012] In one embodiment, the first frequency band antenna unit and the second frequency band antenna unit both achieve circular polarization effect by using rectangular radiation patches with metal slots. Specifically, the first radiation patch uses a rectangular radiation patch, and the first radiation patch has a horizontally set first metal slot on one side adjacent to the polarizing metal sheet and on the opposite side; the second radiation patch uses a rectangular radiation patch, and the second radiation patch has a horizontally set second metal slot on one side adjacent to the polarizing metal sheet and on the opposite side. By providing metal slots on the radiation patches, the corresponding radiation patches and the size of the metal slots can be selected quickly and easily according to the working frequency band corresponding to the antenna unit, thereby reducing the setting size of the radiation patches while increasing the bandwidth of the antenna unit, and at the same time increasing the gain and axial ratio of the antenna unit.

[0013] Preferably, in order to ensure that both the first frequency band antenna unit and the second frequency band antenna unit maintain good antenna performance while maintaining their low profile characteristics, so that the antenna device can be arranged in the back panel space of the communication terminal without affecting the installation space of other devices in the accommodating cavity, the cross-sectional dimensions of the first frequency band antenna unit and the second frequency band antenna unit are set to 0.005~0.01 times the working wavelength of the uplink antenna unit.

[0014] In one embodiment, the first frequency band antenna unit and the second frequency band antenna unit both realize circular polarization effect by adopting rectangular radiation patches with cut corners. Specifically, the first radiation patch adopts a rectangular radiation patch, and the first radiation patch cuts off the areas of two right-angled triangles located at the diagonal position of the rectangular radiation patch; the second radiation patch adopts a rectangular radiation patch, and the second radiation patch cuts off the areas of two right-angled triangles located at the diagonal position of the rectangular radiation patch; by setting the cut corners on the radiation patch, it is convenient and quick to select the corresponding radiation patch and the size of the cut right-angled triangle according to the working frequency band corresponding to the antenna unit, while reducing the setting size of the radiation patch and improving the bandwidth of the antenna unit, and at the same time improving the gain and axial ratio of the antenna unit. Further, in order to simultaneously realize the circular polarization performance of the first frequency band antenna unit and the second frequency band antenna unit, and improve the isolation between the first frequency band antenna unit and the second frequency band antenna unit, it is set so that the cut corner direction of the rectangular radiation patch on the first radiation patch is different from the cut corner direction of the rectangular radiation patch on the second radiation patch.

[0015] Preferably, in order to make the polarization unit have a good beam deflection effect for both the first frequency band antenna unit and the second frequency band antenna unit, the polarization unit is configured to use a rectangular polarization metal sheet, with the side of the rectangular polarization metal sheet adjacent to the first radiation patch and the second radiation patch as the long side, and the side vertically arranged and perpendicular to the long side as the wide side; The length of the long side of the rectangular polarizing metal sheet is set to be greater than 0.45 times the working wavelength of the uplink antenna unit; The setting length of the wide side of the rectangular polarizing metal sheet is greater than 0.3 times the working wavelength of the uplink antenna unit.

[0016] Further preferably, in order to make the polarization unit have a better beam deflection effect for both the first frequency band antenna unit and the second frequency band antenna unit, the first radiation patch and the second radiation patch are arranged to be flush with one end of the rectangular polarization metal plate; and the setting spacing length between the rectangular polarization metal plate and the first radiation patch and the second radiation patch is 0.01~0.03 times the working wavelength of the uplink antenna unit, and the setting spacing length between the rectangular polarization metal plate and the first radiation patch and the second radiation patch is not greater than 3mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. A dual-band dual circular polarization satellite communication antenna device is provided. By adopting a first-band antenna unit, a second-band antenna unit and a polarization unit arranged in a coplanar manner, the beam direction of the first-band and second-band antennas is deflected from the backfire direction to the endfire direction by adding a separate polarization unit, thereby improving the directivity of the antenna unit, improving the gain axis ratio performance of the antenna unit, optimizing the efficiency of signal reception and transmission, and at the same time improving the flexibility of the setting and coordination of each unit in the antenna device, thereby expanding the application range of the antenna device. Among them, the first-band antenna unit, the second-band antenna unit and the polarization unit are closely matched in physical layout, which can effectively save layout space while providing balanced performance; at the same time, due to the gaps between the units, the decoupling design between the units is realized, thereby improving the working stability and signal clarity of each unit in the antenna device.

[0018] 2. By setting the first frequency band and the second frequency band antenna units to use radiating patch antennas, while maintaining the low-profile design of the dual-band antenna units, the circular polarization performance can be easily achieved by adjusting the shape and size of the corresponding radiating patches, thereby greatly improving the gain and axial ratio of the antenna unit; secondly, by allowing the antenna units of the two adjacent frequency bands to form circular polarization with inconsistent rotation directions, the isolation between the antenna units of the two frequency bands is improved, thereby effectively avoiding signal interference between the antenna units and improving the stability and reliability of satellite communications.

[0019] 3. A communication terminal is provided, which realizes the two-way communication needs of the communication terminal by covering the antenna unit with dual-band settings, and realizes right-hand circular polarization for the uplink antenna unit and left-hand circular polarization for the downlink antenna unit by adopting a patch antenna. It not only broadens the bandwidth of the antenna unit, but also improves the isolation between the uplink and downlink antenna units, effectively avoids signal interference between the antenna units, improves the gain and axial ratio of the antenna unit, and thus ensures the frequency stability and reliability of uplink and downlink communications. Furthermore, the antenna device is arranged at the back panel of the communication terminal, and the polarization metal sheet is arranged near the top edge of the back panel. Not only the isolation between the uplink and downlink antenna units is further improved by introducing the deflection metal sheet between the patch antennas, the gain and axial ratio of the antenna unit are improved, but also the beam propagation direction of the antenna unit is adjusted so that the signal propagation direction can be propagated along the end, which can better connect with the satellite. At the same time, since the antenna device is placed on the back of a communication terminal such as a mobile phone, away from the screen and the end frame, the back space of the communication terminal is fully utilized, and the frame position is not competed with antenna devices that realize other functions, which enriches the application scenarios of the antenna device in communication terminals such as mobile phones. At the same time, when using the communication terminal for calls, the head can be effectively prevented from affecting the antenna device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is one of the structural schematic diagrams of the dual-frequency dual circular polarization antenna device of the present invention; Figure 2 This is the second structural schematic diagram of the dual-frequency dual circular polarization antenna device of the present invention; Figure 3 This is the third structural schematic diagram of the dual-frequency dual circular polarization antenna device of the present invention; Figure 4 A schematic diagram of the structure of a communication terminal provided in Embodiment 5 of the present invention; Figure 5 A schematic diagram of the structure of a communication terminal provided in Comparative Example 1 of the present invention; Figure 6 A schematic diagram of S parameters of an uplink antenna unit in a communication terminal provided in Comparative Example 1 of the present invention; Figure 7 A schematic diagram of axial ratio parameters of an uplink antenna unit in a communication terminal provided in Comparative Example 1 of the present invention; Figure 8 A schematic diagram of the gain direction of an uplink antenna unit in a communication terminal provided in Comparative Example 1 of the present invention; Fig. 9 A schematic diagram of S parameters of a downlink antenna unit in a communication terminal provided in Comparative Example 1 of the present invention; Fig.10 A schematic diagram of axial ratio parameters of an uplink antenna unit in a communication terminal provided in Comparative Example 1 of the present invention; Fig.11 A schematic diagram of the gain direction of a downlink antenna unit in a communication terminal provided in Comparative Example 1 of the present invention; Fig.12 A schematic diagram of S parameters and axial ratio parameters of an uplink antenna unit in a communication terminal provided in Embodiment 5 of the present invention; Fig.13 A schematic diagram of the gain direction of an uplink antenna unit in a communication terminal provided in Embodiment 5 of the present invention; Fig.14 A schematic diagram of the axial ratio direction of the uplink antenna unit in the communication terminal provided in Embodiment 5 of the present invention; Fig.15 A schematic diagram of S parameters and axial ratio parameters of a downlink antenna unit in a communication terminal provided in Embodiment 5 of the present invention; Fig.16 A schematic diagram of the gain direction of a downlink antenna unit in a communication terminal provided in Embodiment 5 of the present invention; Fig.17 A schematic diagram of the axial ratio direction of the downlink antenna unit in the communication terminal provided in Embodiment 5 of the present invention; Fig.18 A schematic diagram of isolation data between an uplink antenna unit and a downlink antenna unit in a communication terminal provided by Embodiment 5 of the present invention; Fig.19 This is a schematic diagram of a simulation of a real call scenario using the communication terminal provided in Example 5 and a human head and hand model provided in Comparative Example 2 of the present invention; Fig. 20 This is a schematic diagram of the S parameters of the uplink antenna unit in the communication terminal when simulating a real call scenario in Comparative Example 2 of the present invention; Fig.21 The gain pattern of the uplink antenna unit in the communication terminal when simulating a real call scenario in Comparative Example 2 of the present invention; Fig. 22 This is a schematic diagram of the S parameters of the downlink antenna unit in the communication terminal when simulating a real call scenario in Comparative Example 2 of the present invention; Fig.23 This is the gain pattern of the downlink antenna unit in the communication terminal when simulating a real call scenario in Comparative Example 2 of the present invention.

[0021] Description of the drawings: a first frequency band antenna unit 100 , a second frequency band antenna unit 200 , a polarization unit 300 , an uplink antenna unit 10 , a downlink antenna unit 20 , a polarization metal sheet 30 , a frame 40 , and a battery 50 . DETAILED DESCRIPTION

[0022] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0023] Example 1 like Figure 1-Figure 3 As shown, this embodiment provides a dual-frequency dual circularly polarized antenna device, including a first frequency band antenna unit 100, a second frequency band antenna unit 200 and a polarization unit 300 arranged in a coplanar manner. The coplanar arrangement allows the first frequency band antenna unit 100, the second frequency band antenna unit 200 and the polarization unit 300 to be closely matched in physical layout, which can effectively save layout space while providing balanced performance; at the same time, the first frequency band antenna unit 100 and the second frequency band antenna unit 200 are arranged in parallel in the horizontal direction, the polarization unit 300 and the first frequency band antenna unit 100 and the second frequency band antenna unit 200 are arranged in parallel in the vertical direction, and there are gaps between the first frequency band antenna unit 100, the second frequency band antenna unit 200 and the polarization unit 300, thereby realizing a decoupling design between the units and improving the working stability and signal clarity of each unit in the antenna device.

[0024] Furthermore, the first frequency band antenna unit 100 uses a first radiation patch to achieve right-hand circular polarization, and the second frequency band antenna unit 200 uses a second radiation patch to achieve left-hand circular polarization; the polarization unit 300 uses a polarization metal sheet, and the polarization unit 300 is used to deflect the beam direction of the first frequency band antenna unit 100 and the second frequency band antenna unit 200 from the backfire direction to the endfire direction. By using a patch antenna to achieve dual-band dual circular polarization of the antenna device, a wider range of satellite communications and more efficient data transmission are achieved. While maintaining the low-profile design of the dual-band antenna units, the circular polarization performance can be easily achieved by adjusting the shape and size of the corresponding radiation patch, thereby greatly improving the gain and axial ratio of the antenna unit; secondly, by making the antenna units of the two adjacent frequency bands form circular polarizations with inconsistent rotation directions, the isolation between the antenna units of the two frequency bands is improved, thereby effectively avoiding signal interference between the antenna units. Furthermore, a separately arranged polarization unit 300 is used to deflect the beam direction of the first frequency band and the second frequency band antenna from the backfire direction to the endfire direction, thereby improving the directivity of the antenna unit, improving the gain axis ratio performance of the antenna unit, optimizing the efficiency of signal reception and transmission, and at the same time improving the flexibility of the setting and coordination of each unit in the antenna device, thereby expanding the application scope of the antenna device.

[0025] Furthermore, the polarization unit 300 adopts a rectangular polarization metal plate, and the first radiation patch and the second radiation patch both adopt rectangular radiation patches; the first radiation patch and the second radiation patch are flush with one end close to the rectangular polarization metal plate; the side length of the rectangular polarization metal plate close to one end of the first radiation patch and the second radiation patch is not less than the horizontal setting distance between the first radiation patch and the second radiation patch, thereby improving the polarization selectivity of the antenna device, making the antenna device more directional for receiving or transmitting signals in the first frequency band and the second frequency band, thereby improving the signal quality and transmission efficiency.

[0026] Furthermore, a plurality of metal gaps are provided on the polarizing metal sheet; by providing metal gaps on the polarizing metal sheet, the isolation between the first frequency band antenna unit 200 and the second frequency band antenna unit 200 is improved, signal interference between the first frequency band antenna unit 200 and the second frequency band antenna unit 200 is avoided, and the working stability and signal clarity of each unit in the antenna device are improved; at the same time, providing metal gaps on the polarizing metal sheet can change the action mode and radiation characteristics of the polarizing metal sheet on electromagnetic waves, further improving the polarization selectivity of the antenna device, making the antenna device more directional for receiving or transmitting signals in the first frequency band and the second frequency band, further improving the gain and axial ratio performance of the first frequency band and the second frequency band antenna unit 200, and improving the signal quality and transmission efficiency.

[0027] Preferably, in order to further improve the isolation between the first frequency band and the second frequency band antenna units 200, avoid signal interference between the first frequency band and the second frequency band antenna units 200, and improve the working stability and signal clarity of each unit in the antenna device, an isolation metal sheet is provided in the gap between the first radiation patch and the second radiation patch, and the isolation metal sheet is provided in parallel with the first radiation patch and the second radiation patch and is not connected to each other. Further preferably, in order to improve the compactness of the antenna device, reduce the space size, and facilitate impedance matching, the size of the isolation metal sheet is set to be no larger than any one of the first radiation patch and the second radiation patch.

[0028] Example 2 like Figure 4 As shown, this embodiment provides a communication terminal, including: a frame 40, a screen and a back plate, the screen and the back plate are arranged oppositely and parallel, the frame 40 surrounds and connects the edges of the screen and the back plate, and a receiving cavity is constructed between the frame 40, the screen and the back plate; The dual-frequency dual-circular polarization antenna device as provided in Example 1 is arranged in the accommodating cavity, the first frequency band antenna unit is an uplink antenna unit 10, and the second frequency band antenna unit is a downlink antenna unit 20; The first radiation patch, the second radiation patch and the polarization metal sheet 30 are arranged on the back panel, and the polarization metal sheet 30 is arranged near the top edge of the back panel. Specifically, the first frequency band antenna unit is the uplink antenna unit 10, and the second frequency band antenna unit is the downlink antenna unit 20. By covering the antenna units with dual frequency band settings, the two-way communication requirements of the communication terminal are realized, and by controlling the shape and size of the radiation patches in the uplink antenna unit 10 and the downlink antenna unit 20, the uplink antenna unit 10 realizes right-hand circular polarization, and the downlink antenna unit 20 realizes left-hand circular polarization, which not only broadens the bandwidth of the antenna unit, but also improves the isolation between the uplink antenna unit 10 and the downlink antenna unit 20, thereby ensuring the frequency stability and reliability of uplink and downlink communications. Furthermore, the antenna unit and the deflection unit can be coplanarly arranged on the back panel of the communication terminal, and the polarization metal sheet 30 is arranged close to the top edge of the back panel, which not only further improves the isolation between the uplink antenna unit 10 and the downlink antenna unit 20, and improves the gain and axial ratio of the antenna unit, but also adjusts the beam propagation direction of the antenna unit so that its signal propagation direction can propagate along the end, and can better connect with the satellite. At the same time, since the antenna device is placed on the back of a communication terminal such as a mobile phone, away from the screen and the end frame, the back space of the communication terminal is fully utilized, and the frame position is not competed with antenna devices that realize other functions, which enriches the application scenarios of the antenna device in communication terminals such as mobile phones. At the same time, when using the communication terminal for calls, the head can be effectively prevented from affecting the antenna device.

[0029] Preferably, in order to ensure that both the first frequency band antenna unit and the second frequency band antenna unit maintain good antenna performance while maintaining their low profile characteristics, so that the antenna device can be arranged in the back panel space of the communication terminal without affecting the installation space of other devices in the accommodating cavity, the cross-sectional dimensions of the first frequency band antenna unit and the second frequency band antenna unit are set to 0.005~0.01 times the working wavelength of the uplink antenna unit 10.

[0030] Preferably, in order to make the polarization unit have a good beam deflection effect for both the first frequency band antenna unit and the second frequency band antenna unit, the polarization unit is configured to use a rectangular polarization metal sheet 30, with the side of the rectangular polarization metal sheet 30 adjacent to the first radiation patch and the second radiation patch as the long side, and the side vertically arranged and perpendicular to the long side as the wide side; The length of the long side of the rectangular polarizing metal sheet 30 is set to be greater than 0.45 times the working wavelength of the uplink antenna unit 10; The width of the rectangular polarizing metal sheet 30 is set to have a length greater than 0.3 times the working wavelength of the uplink antenna unit 10 .

[0031] Further preferably, in order to make the polarization unit have a better beam deflection effect for both the first frequency band antenna unit and the second frequency band antenna unit, the first radiation patch is arranged to be flush with the second radiation patch close to one end of the rectangular polarization metal plate 30; the setting spacing length between the rectangular polarization metal plate 30 and the first radiation patch and the second radiation patch is 0.01~0.03 times the working wavelength of the uplink antenna unit 10, and the setting spacing length between the rectangular polarization metal plate 30 and the first radiation patch and the second radiation patch is not greater than 3mm.

[0032] Example 3 like Figure 4 As shown, this embodiment provides a communication terminal, the communication terminal includes: a frame 40, a screen and a back plate, the screen and the back plate are arranged oppositely and parallel, the frame 40 surrounds and connects the edges of the screen and the back plate, and a receiving cavity is constructed between the frame 40, the screen and the back plate, and the receiving cavity is provided with a dual-frequency dual circularly polarized antenna device as provided in Example 1. The difference from Example 2 is that: The first frequency band antenna unit and the second frequency band antenna unit both achieve circular polarization effect by using rectangular radiation patches with metal slots. Specifically, the first radiation patch uses a rectangular radiation patch, and the first radiation patch has a horizontally set first metal slot on one side adjacent to the polarization metal sheet 30 and on the opposite side thereof; the second radiation patch uses a rectangular radiation patch, and the second radiation patch has a horizontally set second metal slot on one side adjacent to the polarization metal sheet 30 and on the opposite side thereof. By providing metal slots on the radiation patches, the corresponding radiation patches and the size of the metal slots provided can be conveniently and quickly selected according to the working frequency band corresponding to the antenna unit, thereby reducing the setting size of the radiation patches while increasing the bandwidth of the antenna unit, and at the same time increasing the gain and axial ratio of the antenna unit.

[0033] Example 4 like Figure 4 As shown, this embodiment provides a communication terminal, the communication terminal includes: a frame 40, a screen and a back plate, the screen and the back plate are arranged oppositely and parallel, the frame 40 surrounds and connects the edges of the screen and the back plate, and a receiving cavity is constructed between the frame 40, the screen and the back plate, and the receiving cavity is provided with a dual-frequency dual circularly polarized antenna device as provided in Example 1. The difference from Example 2 is that: The first frequency band antenna unit and the second frequency band antenna unit both achieve circular polarization effect by using rectangular radiation patches with cut corners. Specifically, the first radiation patch adopts a rectangular radiation patch, and the first radiation patch cuts off the areas of two right-angled triangles located at the diagonal position of the rectangular radiation patch; the second radiation patch adopts a rectangular radiation patch, and the second radiation patch cuts off the areas of two right-angled triangles located at the diagonal position of the rectangular radiation patch; by setting the cut corners on the radiation patch, it is convenient and quick to select the corresponding radiation patch and the size of the cut right-angled triangle according to the working frequency band corresponding to the antenna unit, while reducing the setting size of the radiation patch and increasing the bandwidth of the antenna unit, and at the same time increasing the gain and axial ratio of the antenna unit. Further, in order to simultaneously achieve the circular polarization performance of the first frequency band antenna unit and the second frequency band antenna unit, and improve the isolation between the first frequency band antenna unit and the second frequency band antenna unit, it is set so that the cut corner direction of the rectangular radiation patch on the first radiation patch is different from the cut corner direction of the rectangular radiation patch on the second radiation patch.

[0034] Example 5 like Figure 4 As shown, this embodiment provides a communication terminal, the communication terminal includes: a frame 40, a screen and a back plate, the screen and the back plate are arranged oppositely and parallel, the frame 40 surrounds and connects the edges of the screen and the back plate, and a receiving cavity is constructed between the frame 40, the screen and the back plate, and a dual-frequency dual circular polarization antenna device as provided in Example 1 is arranged in the receiving cavity; wherein the uplink antenna unit 10 and the downlink antenna unit 20 both adopt a patch antenna with a cut corner setting, which is different from Example 4 in that: The accommodating cavity also includes a battery 50. In the dual-frequency dual-circular polarization antenna device, the target operating frequency band of the uplink antenna unit 10 is 1.955-1.975GHz, and the target operating frequency band of the downlink antenna unit 20 is 2.145-2.165GHz. Among them, the cross-sectional size of the uplink antenna unit 10 and the downlink antenna unit 20 is 0.007 times the operating wavelength of the uplink antenna unit 10, which is 1mm; the polarization unit adopts a rectangular polarization metal sheet 30, and a plurality of metal gaps are arranged on the rectangular polarization metal sheet 30. In order to ensure the beam deflection effect of the rectangular polarization metal sheet 30 on the uplink and downlink antenna units 20, the first radiation patch is set to be flush with the second radiation patch close to one end of the rectangular polarization metal sheet; and the setting spacing length between the rectangular polarization metal sheet 30 and the first radiation patch and the second radiation patch is 0.02 times the working wavelength of the uplink antenna unit 10, which is 3mm; the long side dimension of the rectangular polarization metal sheet 30 is greater than 0.45 times the working wavelength of the uplink antenna unit 10, and the wide side dimension of the rectangular polarization metal sheet 30 is greater than 0.3 times the working wavelength of the uplink antenna unit 10.

[0035] Comparative Example 1 like Figure 5 As shown, this comparative example provides a communication terminal. The difference between this comparative example 1 and embodiment 5 is that the polarizing metal sheet 30 is not included.

[0036] Comparative Example 2 like Fig.19 As shown, this comparative example uses the communication terminal provided in Example 5 in combination with a human head and hand model to simulate a real call scenario, and then tests the influence of the human head and hand in the usage scenario on the antenna device in the communication terminal.

[0037] like Figure 4-Figure 23 As shown, the dual-frequency dual circular polarization antenna device and the communication terminal provided in Example 5 were subjected to performance tests, and compared with the communication terminals provided in Comparative Example 1 and Comparative Example 2, and the results are as follows: like Figure 6-7 As shown, the schematic diagram of the S parameters and axial ratio parameters of the uplink antenna unit in the communication terminal provided in Comparative Example 1 shows that within the target frequency band of 1.955-1.975GHz, the antenna impedance matching is ≤-10dB and the axial ratio is ≤3dB; Figure 8 As shown, the schematic diagram of the gain direction of the uplink antenna unit in the communication terminal provided in Comparative Example 1 shows that the main radiation direction of the antenna unit is the front and back of the communication terminal; Figure 9-10 As shown, the schematic diagram of the S parameters and axial ratio parameters of the downlink antenna unit in the communication terminal provided in Comparative Example 1 shows that: in the target frequency band: within the target frequency band: 2.145-2.165GHz, the antenna impedance matching is ≤-15dB, and the axial ratio is ≤3dB; Fig.11 As shown, the schematic diagram of the gain direction of the downlink antenna unit in the communication terminal provided in Comparative Example 1 shows that the main radiation direction of the antenna unit is the front and back of the communication terminal.

[0038] like Fig.12 As shown, the S parameter schematic diagram of the uplink antenna unit in the communication terminal provided in Example 5 shows that: within the target frequency band of 1.955-1.975GHz, the antenna impedance matching is ≤-10dB; Fig.13 As shown, the schematic diagram of the gain direction of the uplink antenna unit in the communication terminal provided in Example 5 shows that: the main radiation direction of the antenna unit is deflected from the front and back of the communication terminal to the top direction; Fig.14 As shown, the schematic diagram of the axial ratio direction of the uplink antenna unit in the communication terminal provided in Example 5 shows that: at a position where the antenna gain is good, a pit appears in the axial ratio direction diagram, the axial ratio is also good, and the antenna unit presents a good circular polarization characteristic. Fig.15 As shown, the S parameter schematic diagram of the downlink antenna unit in the communication terminal provided in Example 5 shows that: in the target frequency band: 2.145-2.165GHz, the antenna impedance matching is ≤-10dB; Fig.16As shown, the schematic diagram of the gain direction of the downlink antenna unit in the communication terminal provided in Example 5 shows that: the main radiation direction of the antenna unit is deflected from the front and back of the communication terminal to the top direction; Fig.17 As shown, the schematic diagram of the axial ratio direction of the downlink antenna unit in the communication terminal provided in Example 5 shows that: at a position where the antenna gain is good, a pit appears in the axial ratio direction diagram, the axial ratio is also good, and the antenna unit presents a good circular polarization characteristic. Fig.18 As shown, the isolation between the uplink antenna unit and the downlink antenna unit in the communication terminal provided by Example 5 is ≥20dB.

[0039] like Fig. 20 As shown, the S parameter diagram of the uplink antenna unit in the communication terminal when simulating a real call scenario provided by Comparative Example 2 shows that: in the target frequency band: 1.955-1.975GHz, the antenna impedance matching is ≤-10dB, that is, the standing wave of the antenna unit is minimally affected by the head and hand; Fig.21 As shown, the gain pattern of the uplink antenna unit in the communication terminal when simulating a real call scenario provided by Comparative Example 2 shows that the main radiation direction of the antenna unit is deflected from the front and back of the communication terminal to the top, that is, the human head and hand have little effect on the beam of the antenna unit; Fig. 22 As shown, the S parameter diagram of the downlink antenna unit in the communication terminal when simulating a real call scenario provided by Comparative Example 2 shows that: in the target frequency band: 2.145-2.165GHz, the antenna impedance matching is ≤-10dB, that is, the standing wave of the antenna unit is minimally affected by the head and hand; Fig.23 As shown, the gain pattern of the uplink antenna unit in the communication terminal when simulating a real call scenario provided by Comparative Example 2 shows that the main radiation direction of the antenna unit is deflected from the front and back of the communication terminal to the top, that is, the human head and hands have little influence on the beam of the antenna unit; therefore, placing the antenna device on the back of the communication terminal can effectively isolate the impact of the head and hands on the performance of the antenna device.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A dual-frequency dual circular polarization antenna device, characterized in that: It includes a first frequency band antenna unit, a second frequency band antenna unit and a polarization unit which are arranged in a coplanar manner; The first frequency band antenna unit and the second frequency band antenna unit are arranged in parallel in the horizontal direction, the polarization unit and the first frequency band antenna unit and the second frequency band antenna unit are arranged in parallel in the vertical direction, and there is a gap between the first frequency band antenna unit, the second frequency band antenna unit and the polarization unit; The first-band antenna unit uses a first radiation patch to achieve right-hand circular polarization, and the second-band antenna unit uses a second radiation patch to achieve left-hand circular polarization; the polarization unit uses a polarization metal sheet, and the polarization unit is used to deflect the beam direction of the first-band antenna unit and the second-band antenna unit from the backfire direction to the endfire direction.

2. The dual-frequency dual circular polarization antenna device according to claim 1, characterized in that: The polarization unit adopts a rectangular polarization metal sheet, and the first radiation patch and the second radiation patch both adopt rectangular radiation patches; The first radiation patch is flush with one end of the second radiation patch close to the rectangular polarizing metal plate; the side length of the rectangular polarizing metal plate close to one end of the first radiation patch and the second radiation patch is not less than the horizontal setting distance between the first radiation patch and the second radiation patch.

3. The dual-frequency dual circular polarization antenna device according to claim 1, characterized in that: The polarizing metal sheet is provided with a plurality of metal gaps.

4. The dual-frequency dual circular polarization antenna device according to claim 1, characterized in that: An isolation metal sheet is disposed in the gap between the first radiation patch and the second radiation patch. The isolation metal sheet is disposed in parallel with the first radiation patch and the second radiation patch and is not connected to each other.

5. A communication terminal, characterized in that: include: A frame, a screen and a back plate, wherein the screen and the back plate are arranged oppositely and in parallel, the frame surrounds and connects the edges of the screen and the back plate, and a receiving cavity is constructed between the frame, the screen and the back plate; The accommodating cavity is provided with a dual-frequency dual-circularly polarized antenna device according to any one of claims 1 to 4, and the first frequency band antenna unit is an uplink antenna unit, and the second frequency band antenna unit is a downlink antenna unit; The first radiation patch, the second radiation patch and the polarizing metal sheet are arranged on the back plate, and the polarizing metal sheet is arranged close to the top edge of the back plate.

6. The communication terminal according to claim 5, characterized in that: The first radiation patch is a rectangular radiation patch, and the first radiation patch is provided with a horizontally arranged first metal gap on a side adjacent to the polarizing metal sheet and on a side opposite to the polarizing metal sheet; The second radiation patch is a rectangular radiation patch, and a second metal gap arranged horizontally is formed on one side adjacent to the polarizing metal sheet and on one side opposite to the polarizing metal sheet.

7. The communication terminal according to claim 5, characterized in that: The first radiation patch is a rectangular radiation patch, and the first radiation patch cuts off two right-angled triangle areas located at the diagonal position of the rectangular radiation patch; The second radiation patch is a rectangular radiation patch, and the second radiation patch cuts off two right-angled triangle areas located at the diagonal position of the rectangular radiation patch; The cutting direction of the rectangular radiation patch on the first radiation patch is different from the cutting direction of the rectangular radiation patch on the second radiation patch.

8. The communication terminal according to any one of claims 5 to 7, characterized in that: The cross-sectional dimensions of the first frequency band antenna unit and the second frequency band antenna unit are 0.005 to 0.01 times the working wavelength of the uplink antenna unit.

9. The communication terminal according to any one of claims 5 to 7, characterized in that: The polarization unit adopts a rectangular polarization metal sheet, with the side of the rectangular polarization metal sheet adjacent to the first radiation patch and the second radiation patch as the long side, and the side vertically arranged and perpendicular to the long side as the wide side; The length of the long side of the rectangular polarizing metal sheet is set to be greater than 0.45 times the working wavelength of the uplink antenna unit; The setting length of the wide side of the rectangular polarizing metal sheet is greater than 0.3 times the working wavelength of the uplink antenna unit.

10. The communication terminal according to claim 9, characterized in that: The first radiation patch is flush with the second radiation patch near one end of the rectangular polarizing metal plate; the setting spacing length between the rectangular polarizing metal plate and the first radiation patch and the second radiation patch is 0.01~0.03 times the working wavelength of the uplink antenna unit, and the setting spacing length between the rectangular polarizing metal plate and the first radiation patch and the second radiation patch is not greater than 3mm.

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