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

Abstract

The present invention provides a dual-band and dual-circularly polarized antenna device and a communication terminal provided with the same. In the antenna device, a first-band antenna unit, a second-band antenna unit and a polarization unit are arranged coplanarly. By adding a separately arranged polarization unit, the beam directions of the first-band and second-band antennas are deflected from the back-radiation direction to the end-fire direction, improving the directivity of the antenna unit, improving the gain axial ratio performance of the antenna unit, optimizing the signal reception and transmission efficiency, and at the same time improving the flexibility of the setting and cooperation of each unit in the antenna device. Further, the antenna device provided by the present invention can maintain its low-profile characteristics while maintaining good antenna performance, so that when applied to a communication terminal, it can be placed on the back, away from the screen and the end frame, realizing the coexistence with other functional antenna devices while ensuring good satellite communication performance, and enriching the application scenarios of the antenna device in the communication terminal.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic radiation, and more specifically, to a dual-band and dual-circularly polarized antenna device and a communication terminal provided with the same. Background Art

[0002] As a basic device for receiving and transmitting radio waves, an antenna is an essential component of a wireless communication system. Among them, due to the good ability of a circularly polarized antenna to resist multipath effects and interference from weather factors such as rain and fog, it is widely used in fields such as mobile communication and base station positioning. Currently, mobile phone products that can achieve satellite communication on the market use communication with geostationary satellites, which have a long communication path and large losses. For mobile phones suitable for 5G communication, due to the narrow internal space, a large number of antennas for implementing various functions need to be arranged inside. To avoid mutual interference between antennas or to prevent the antenna function from being interfered by other components of the device, such as the battery, screen, etc., many mobile phones design the antenna on the frame of the body, usually in certain areas of the metal frame, especially the top, bottom, or side areas of the mobile phone, in order to provide better wireless signal coverage.

[0003] The overly limited installation space makes the antenna device for satellite communication have no independent and ideal space to arrange a conventional circularly polarized antenna. Therefore, only a linearly polarized antenna can be used, or a circularly polarized antenna is used but its axial ratio parameter is not ideal, and its efficiency is almost equivalent to that of a linearly polarized antenna, which greatly limits the performance design of the antenna for satellite communication in mobile phones. For example, in Chinese Patent Application CN 116053760 A, a communication terminal is mentioned. The circular polarization axial ratio of the satellite communication antenna arranged thereon is less than or equal to 10 dB within the working frequency band, and the transceiver gain of the antenna is about -6 dBi or -7 dBi. The performance of the antenna 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 arranged at the same position, and it is necessary to overcome a large coexistence interference problem between the antennas.

[0004] Therefore, it is necessary to design the structure and application function of the antenna for satellite communication transceiver according to the actual application environment of mobile phone products, and provide a dual-band and 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

[0005] The present invention aims to overcome at least one of the above-mentioned deficiencies of the prior art, and provides a dual-band and dual-circularly polarized antenna device and a communication terminal provided with the same.

[0006] An object of the present invention is to provide a dual-band and dual-circularly polarized antenna device, including a first frequency band antenna unit, a second frequency band antenna unit, and a polarization unit arranged in a coplanar manner;

[0007] The first - band antenna unit and the second - band antenna unit are arranged in parallel in the horizontal direction. The polarization unit is arranged in parallel with the first - band antenna unit and the second - band antenna unit in the vertical direction, and there are gaps between the first - band antenna unit, the second - band antenna unit, and the polarization unit;

[0008] 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 directions of the first - band antenna unit and the second - band antenna unit from the back - radiation direction to the end - radiation direction.

[0009] In this technical solution, the designed satellite communication antenna device adopts a coplanar arrangement of the first - band antenna unit, the second - band antenna unit, and the polarization unit, enabling the first - band antenna unit, the second - band antenna unit, and the polarization unit to closely cooperate in physical layout. While providing balanced performance, it can effectively save layout space; at the same time, since there are gaps between the units, a decoupling design between the units is achieved, improving the working stability and signal clarity of each unit in the antenna device. Further, the antenna device realizes a more extensive satellite communication and more efficient data transmission through a design that uses patch antennas to achieve dual - band dual - circular polarization, meeting the requirements for stable communication in different frequency bands; specifically, by setting both the first - band antenna unit and the second - band antenna unit to use radiation patch antennas, while maintaining the low - profile design of the dual - band antenna unit, the circular polarization performance can be conveniently achieved by adjusting the shape and size of their corresponding radiation patches respectively, thus greatly enhancing the gain and axial ratio of the antenna unit; secondly, by setting the first - band antenna unit to achieve right - hand circular polarization by using a first radiation patch and the second - band antenna unit to achieve left - hand circular polarization by using a second radiation patch, the isolation between the antenna units of the two adjacent frequency bands is improved by making the circular polarizations of the two adjacent frequency - band antenna units have inconsistent rotation directions, effectively avoiding signal interference between the antenna units and enhancing the stability and reliability of satellite communication. Further, the propagation direction of the signals generated by the first - band antenna unit and the second - band antenna unit is accurately controlled by setting a polarization unit. The polarization unit uses a polarization metal sheet and is used to deflect the beam directions of the first - band and second - band antennas from the back - radiation direction to the end - radiation direction. By adding a separately - arranged polarization unit to control the signal propagation direction, not only can the directivity of the antenna unit be improved, the gain - axial - ratio performance of the antenna unit be improved, and the efficiency of signal reception and transmission be optimized, but also the flexibility of the setting and cooperation of each unit in the antenna device is improved, expanding the application range of the antenna device.

[0010] Furthermore, the polarization unit uses a rectangular polarized metal sheet, and both the first radiation patch and the second radiation patch use rectangular radiation patches; one end of the first radiation patch and the second radiation patch close to the rectangular polarized metal sheet is flush; the side length of the rectangular polarized metal sheet close to one end of the first radiation patch and the second radiation patch is not less than the setting distance of the first radiation patch and the second radiation patch together in the horizontal direction. In this 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 both the first frequency band antenna unit and the second frequency band antenna unit use 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 setting distance of the first radiation patch and the second radiation patch together in the horizontal direction, it can be ensured that the rectangular polarized metal sheet covers the radiation areas 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 the specific polarization direction, thereby improving the polarization selectivity of the antenna device, making the antenna device more directional for signal reception or transmission in the first frequency band and the second frequency band, and improving the signal quality and transmission efficiency.

[0011] Furthermore, several metal slits are provided on the polarized metal sheet; by opening metal slits on the polarized metal sheet, the isolation degree between the first frequency band antenna unit and the second frequency band antenna unit is improved, signal interference between the first frequency band antenna unit and the second frequency band antenna unit is avoided, and the working stability and signal clarity of each unit in the antenna device are improved; at the same time, setting metal slits on the polarized metal sheet can change the action mode and radiation characteristics of the polarized metal sheet on electromagnetic waves, further improving the polarization selectivity of the antenna device, making the antenna device more directional for signal reception or transmission in the first frequency band and the second frequency band, further improving the gain and axial ratio performance of the first frequency band antenna unit and the second frequency band antenna unit, and improving the signal quality and transmission efficiency.

[0012] Preferably, in order to further improve the isolation degree between the first frequency band antenna unit and the second frequency band antenna unit, avoid signal interference between the first frequency band antenna unit and the second frequency band antenna unit, 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 arranged parallel to the first radiation patch and the second radiation patch and is not connected to each other. Preferably, in order to improve the setting tightness of the antenna device, reduce the space size, and facilitate impedance matching at the same time, the size of the isolation metal sheet is set to be not larger than any one of the first radiation patch and the second radiation patch.

[0013] Another object of the present invention is to provide a communication terminal, comprising: a housing, a screen and a back plate, wherein the screen and the back plate are oppositely and parallelly arranged, the housing surrounds and connects the edges of the screen and the back plate, and a receiving cavity is constructed between the housing, the screen and the back plate;

[0014] A dual-band dual-circularly polarized antenna device according to the technical solution is arranged in the receiving cavity, the first-band antenna unit is an uplink antenna unit, and the second-band antenna unit is a downlink antenna unit;

[0015] The first radiation patch, the second radiation patch and the polarization metal sheet are arranged on the back plate, and the polarization metal sheet is arranged near the top edge of the back plate.

[0016] In the technical solution, by using the dual-band dual-circularly polarized antenna device provided in the technical solution as the antenna device for realizing satellite communication in the communication terminal, and setting the first-band antenna unit as the uplink antenna unit and the second-band antenna unit as the downlink antenna unit, the two-way communication requirement of the communication terminal is realized through the antenna units arranged in a dual-band manner, and the dual-circular polarization of the uplink antenna unit and the downlink antenna unit is realized by adopting a patch antenna; further, by controlling the shapes and sizes of the radiation patches in the uplink antenna unit and the downlink antenna unit, the uplink antenna unit realizes right-handed circular polarization, and the downlink antenna unit realizes left-handed 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 the uplink and downlink communications. Further, the antenna unit and the deflection unit can be coplanarly arranged at the back plate of the communication terminal, and the polarization metal sheet is arranged near the top edge of the back plate, which not only further improves the isolation between the uplink and downlink antenna units by introducing a deflection metal sheet between the patch antennas, 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 be better connected 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 position of the frame is not snatched by the antenna devices for realizing other functions, enriching the application scenarios of the antenna device in communication terminals such as mobile phones. At the same time, when making a call with the communication terminal, the influence of the head on the antenna device can be effectively prevented.

[0017] In one embodiment, both the first-band antenna unit and the second-band antenna unit achieve the circular polarization effect by using a rectangular radiation patch with a metal slit. Specifically, the first radiation patch is a rectangular radiation patch, and the first radiation patch is provided with horizontally arranged first metal slits on one side adjacent to the polarization metal sheet and its opposite side; the second radiation patch is a rectangular radiation patch, and the second radiation patch is provided with horizontally arranged second metal slits on one side adjacent to the polarization metal sheet and its opposite side. By providing metal slits on the radiation patch, it is convenient and quick to select the corresponding radiation patch and the size of the metal slit according to the operating frequency band corresponding to the antenna unit, reducing the setting size of the radiation patch while increasing the bandwidth of the antenna unit, and at the same time increasing the gain and axial ratio of the antenna unit.

[0018] Preferably, in order to ensure that both the first-band antenna unit and the second-band antenna unit maintain good antenna performance, and at the same time maintain their low-profile characteristics, so that the antenna device can be arranged in the backplane space of the communication terminal without affecting the setting space of other components in the accommodation cavity, it is set that the profile size of the first-band antenna unit and the second-band antenna unit is 0.005 to 0.01 times the operating wavelength of the uplink antenna unit.

[0019] In one embodiment, both the first-band antenna unit and the second-band antenna unit achieve the circular polarization effect by using a rectangular radiation patch with a chamfered setting. Specifically, the first radiation patch is a rectangular radiation patch, and two right-angled triangle regions located at the diagonal positions of the rectangular radiation patch are cut off from the first radiation patch; the second radiation patch is a rectangular radiation patch, and two right-angled triangle regions located at the diagonal positions of the rectangular radiation patch are cut off from the second radiation patch; by performing a chamfered setting on the radiation patch, it is convenient and quick to select the corresponding radiation patch and the size of the cut-off right-angled triangle according to the operating frequency band corresponding to the antenna unit, reducing the setting size of the radiation patch while 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-band antenna unit and the second-band antenna unit respectively and increase the isolation between the first-band antenna unit and the second-band antenna unit, it is set that the chamfering direction of the rectangular radiation patch on the first radiation patch is different from the chamfering direction of the rectangular radiation patch on the second radiation patch.

[0020] Preferably, in order to enable the polarization unit to have a good beam deflection effect on both the first-band antenna unit and the second-band antenna unit, it is set that the polarization unit uses a rectangular polarization metal sheet, with the side adjacent to the first radiation patch and the second radiation patch of the rectangular polarization metal sheet as the long side, and the side vertically arranged and perpendicular to the long side as the wide side;

[0021] The set length of the long side of the rectangular polarized metal sheet is greater than 0.45 times the operating wavelength of the uplink antenna unit;

[0022] The set length of the wide side of the rectangular polarized metal sheet is greater than 0.3 times the operating wavelength of the uplink antenna unit.

[0023] Further preferably, in order to enable the polarization unit to have a good beam deflection effect on both the first-band antenna unit and the second-band antenna unit, it is set that one end of the first radiation patch and the second radiation patch close to the rectangular polarized metal sheet is flush; and the set spacing length between the rectangular polarized metal sheet and the first radiation patch and the second radiation patch is 0.01 to 0.03 times the operating wavelength of the uplink antenna unit, and the set spacing length between the rectangular polarized metal sheet and the first radiation patch and the second radiation patch is not greater than 3 mm.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. A dual-band dual-circularly polarized 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 directions of the first-band and second-band antennas are deflected from the back-radiation direction to the end-fire direction by adding a separately arranged polarization unit, improving the directivity of the antenna unit, improving the gain axial ratio performance of the antenna unit, optimizing the signal reception and transmission efficiency, and at the same time improving the flexibility of the setting and cooperation of each unit in the antenna device, 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 cooperated in the physical layout, effectively saving the 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, improving the working stability and signal clarity of each unit in the antenna device.

[0026] 2. By setting that both the first-band and second-band antenna units adopt radiation patch antennas, while maintaining the low-profile design of the dual-band antenna units, the circular polarization performance can be conveniently realized by adjusting the shapes and sizes of their corresponding radiation patches respectively, thus greatly improving the gain and axial ratio of the antenna units; secondly, by making the adjacent antenna units of the two bands form circular polarizations with inconsistent rotation directions, the isolation degree between the antenna units of the two bands is improved, effectively avoiding signal interference between the antenna units, and improving the stability and reliability of satellite communication.

[0027] 3. A communication terminal is provided. The two-way communication requirements of the communication terminal are achieved through an antenna unit with a dual-band setting. By using a patch antenna, the uplink antenna unit realizes right-handed circular polarization, and the downlink antenna unit realizes left-handed circular polarization. This not only broadens the bandwidth of the antenna unit but also improves the isolation between the uplink and downlink antenna units, effectively avoiding signal interference between the antenna units, improving the gain and axial ratio of the antenna unit, and thus ensuring the frequency stability and reliability of the uplink and downlink communications. Further, the antenna device is arranged at the backplane of the communication terminal, and the polarized metal sheet is arranged near the top edge of the backplane. This not only further improves the isolation between the uplink and downlink antenna units by introducing a deflected metal sheet between the patch antennas, 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, which can be better connected 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, it makes full use of the back space of the communication terminal, does not compete with the antenna devices for other functions for the position of the frame, enriches the application scenarios of the antenna device in communication terminals such as mobile phones, and can effectively prevent the influence of the head on the antenna device when using the communication terminal for a call. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 1 is one of the schematic structural diagrams of the dual-band and dual-circular polarization antenna device of the present invention;

[0029] Figure 2 FIG. 2 is another schematic structural diagram of the dual-band and dual-circular polarization antenna device of the present invention;

[0030] Figure 3 FIG. 3 is yet another schematic structural diagram of the dual-band and dual-circular polarization antenna device of the present invention;

[0031] Figure 4 FIG. 4 is the schematic structural diagram of the communication terminal provided in Embodiment 5 of the present invention;

[0032] Figure 5 FIG. 5 is the schematic structural diagram of the communication terminal provided in Comparative Example 1 of the present invention;

[0033] Figure 6 FIG. 6 is the S-parameter schematic diagram of the uplink antenna unit in the communication terminal provided in Comparative Example 1 of the present invention;

[0034] Figure 7 FIG. 7 is the axial ratio parameter schematic diagram of the uplink antenna unit in the communication terminal provided in Comparative Example 1 of the present invention;

[0035] Figure 8 FIG. 8 is the gain direction schematic diagram of the uplink antenna unit in the communication terminal provided in Comparative Example 1 of the present invention;

[0036] Figure 9S-parameter schematic diagram of the downlink antenna unit in the communication terminal provided in Comparative Example 1 of the present invention;

[0037] Figure 10 Axial ratio parameter schematic diagram of the uplink antenna unit in the communication terminal provided in Comparative Example 1 of the present invention;

[0038] Figure 11 Gain direction schematic diagram of the downlink antenna unit in the communication terminal provided in Comparative Example 1 of the present invention;

[0039] Figure 12 S-parameter and axial ratio parameter schematic diagrams of the uplink antenna unit in the communication terminal provided in Embodiment 5 of the present invention;

[0040] Figure 13 Gain direction schematic diagram of the uplink antenna unit in the communication terminal provided in Embodiment 5 of the present invention;

[0041] Figure 14 Axial ratio direction schematic diagram of the uplink antenna unit in the communication terminal provided in Embodiment 5 of the present invention;

[0042] Figure 15 S-parameter and axial ratio parameter schematic diagrams of the downlink antenna unit in the communication terminal provided in Embodiment 5 of the present invention;

[0043] Figure 16 Gain direction schematic diagram of the downlink antenna unit in the communication terminal provided in Embodiment 5 of the present invention;

[0044] Figure 17 Axial ratio direction schematic diagram of the downlink antenna unit in the communication terminal provided in Embodiment 5 of the present invention;

[0045] Figure 18 Isolation degree data schematic diagram between the uplink antenna unit and the downlink antenna unit in the communication terminal provided in Embodiment 5 of the present invention;

[0046] Figure 19 Schematic diagram of simulating a real call scenario by using the communication terminal provided in Embodiment 5 of the present invention with a human head and hand model in Comparative Example 2 of the present invention;

[0047] Figure 20 S-parameter schematic diagram of the uplink antenna unit in the communication terminal when simulating a real call scenario in Comparative Example 2 of the present invention;

[0048] Figure 21 Gain direction diagram of the uplink antenna unit in the communication terminal when simulating a real call scenario in Comparative Example 2 of the present invention;

[0049] Figure 22 S-parameter schematic diagram of the downlink antenna unit in the communication terminal when simulating a real call scenario in Comparative Example 2 of the present invention;

[0050] Figure 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.

[0051] Description of the drawings: First frequency band antenna unit 100, second frequency band antenna unit 200, polarization unit 300, uplink antenna unit 10, downlink antenna unit 20, polarization metal sheet 30, housing 40, battery 50. Detailed implementation manners

[0052] The drawings of the present invention are only for illustrative purposes and should not be construed as a limitation of the present invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0053] Embodiment 1

[0054] As Figures 1 - 3 shown, this embodiment provides a dual-band and 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 which are coplanarly arranged. By the coplanar arrangement, the first frequency band antenna unit 100, the second frequency band antenna unit 200 and the polarization unit 300 are closely cooperated in the physical layout, which can effectively save the 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 is arranged in parallel with the first frequency band antenna unit 100 and the second frequency band antenna unit 200 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, so as to realize the decoupling design between the units and improve the working stability and signal clarity of each unit in the antenna device.

[0055] Furthermore, the first-band antenna unit 100 uses a first radiation patch to achieve right-hand circular polarization, and the second-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 directions of the first-band antenna unit 100 and the second-band antenna unit 200 from the back-radiation direction to the end-fire direction. By using patch antennas to achieve dual-band dual-circular polarization of the antenna device, wider satellite communication and more efficient data transmission are realized. While maintaining the low-profile design of both dual-band antenna units, the circular polarization performance can be easily achieved by adjusting the shapes and sizes of their corresponding radiation patches, thus greatly improving the gain and axial ratio of the antenna units. Secondly, by making the circular polarizations of the adjacent antenna units of the two bands have inconsistent rotation directions, the isolation between the antenna units of the two bands is improved, thus effectively avoiding signal interference between the antenna units. Furthermore, the beam directions of the first-band and second-band antennas are deflected from the back-radiation direction to the end-fire direction by the separately provided polarization unit 300, improving the directivity of the antenna units, improving the gain axial ratio performance of the antenna units, optimizing the signal reception and transmission efficiency, and at the same time improving the flexibility of the setting and cooperation of each unit in the antenna device and expanding the application range of the antenna device.

[0056] Furthermore, the polarization unit 300 uses a rectangular polarization metal sheet, and both the first radiation patch and the second radiation patch use rectangular radiation patches; one end of the first radiation patch and the second radiation patch close to the rectangular polarization metal sheet is flush; the side length of the rectangular polarization metal sheet close to one end of the first radiation patch and the second radiation patch is not less than the setting distance of the first radiation patch and the second radiation patch together in the horizontal direction, thereby improving the polarization selectivity of the antenna device, making the antenna device more directional for signal reception or transmission in the first band and the second band, and improving the signal quality and transmission efficiency.

[0057] Furthermore, a number of metal slits are provided on the polarization metal sheet; by opening metal slits on the polarization metal sheet, the isolation between the first-band and second-band antenna units 200 is improved, signal interference between the first-band and second-band antenna units 200 is avoided, and the working stability and signal clarity of each unit in the antenna device are improved; at the same time, setting metal slits on the polarization metal sheet can change the action mode and radiation characteristics of the polarization metal sheet on electromagnetic waves, further improving the polarization selectivity of the antenna device, making the antenna device more directional for signal reception or transmission in the first band and the second band, further improving the gain and axial ratio performance of the first-band and second-band antenna units 200, and improving the signal quality and transmission efficiency.

[0058] Preferably, in order to further improve the isolation between the first-band and second-band antenna units 200, avoid signal interference between the first-band and second-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. The isolation metal sheet is arranged parallel to 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 not larger than any one of the first radiation patch and the second radiation patch.

[0059] Embodiment 2

[0060] As Figure 4 shown, this embodiment provides a communication terminal, including: a frame body 40, a screen and a back plate. The screen and the back plate are arranged oppositely and parallel to each other. The frame body 40 surrounds and connects the edges of the screen and the back plate, and constructs an accommodation cavity between the frame body 40, the screen and the back plate.

[0061] An antenna device with dual-band and dual-circular polarization provided in the embodiment 1 is arranged in the accommodation cavity. The first-band antenna unit is the uplink antenna unit 10, and the second-band antenna unit is the downlink antenna unit 20.

[0062] The first radiation patch, the second radiation patch and the polarization metal sheet 30 are arranged on the back plate, and the polarization metal sheet 30 is arranged close to the top edge of the back plate. Specifically, the first-band antenna unit is the uplink antenna unit 10, and the second-band antenna unit is the downlink antenna unit 20. The two-way communication requirements of the communication terminal are realized through the antenna units arranged to cover the dual bands. By controlling the shapes and sizes of the radiation patches in the uplink antenna unit 10 and the downlink antenna unit 20, the uplink antenna unit 10 realizes right-handed circular polarization, and the downlink antenna unit 20 realizes left-handed circular polarization. This 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, thus ensuring the frequency stability and reliability of the uplink and downlink communications. Further, the antenna unit and the deflection unit can be coplanarly arranged at the back plate of the communication terminal, and the polarization metal sheet 30 is arranged close to the top edge of the back plate. This not only further improves the isolation between the uplink antenna unit 10 and the downlink antenna unit 20, improves the gain and axial ratio of the antenna unit, but also adjusts the beam propagation direction of the antenna unit, so that the signal propagation direction can propagate along the end, which can be better connected 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 it does not compete with the antenna devices for other functions for the position of the frame, enriching the application scenarios of the antenna device in communication terminals such as mobile phones. At the same time, when using the communication terminal for a call, the influence of the head on the antenna device can be effectively prevented.

[0063] Preferably, in order to ensure that both the first-band antenna unit and the second-band antenna unit maintain good antenna performance, while maintaining their low-profile characteristics, so that the antenna device can be arranged in the backplane space of the communication terminal without affecting the setting space of other components in the accommodation cavity, the profile sizes of the first-band antenna unit and the second-band antenna unit are set to be 0.005 to 0.01 times the operating wavelength of the uplink antenna unit 10.

[0064] Preferably, in order to enable the polarization unit to have a good beam deflection effect on both the first-band antenna unit and the second-band antenna unit, the polarization unit is set to adopt a rectangular polarization metal sheet 30. The side of the rectangular polarization metal sheet 30 adjacent to the first radiation patch and the second radiation patch is the long side, and the side vertically arranged and perpendicular to the long side is the wide side;

[0065] The set length of the long side of the rectangular polarization metal sheet 30 is greater than 0.45 times the operating wavelength of the uplink antenna unit 10;

[0066] The set length of the wide side of the rectangular polarization metal sheet 30 is greater than 0.3 times the operating wavelength of the uplink antenna unit 10.

[0067] Further preferably, in order to enable the polarization unit to have a good beam deflection effect on both the first-band antenna unit and the second-band antenna unit, the ends of the first radiation patch and the second radiation patch close to the rectangular polarization metal sheet 30 are set to be flush; the set spacing length between the rectangular polarization metal sheet 30 and the first radiation patch and the second radiation patch is 0.01 to 0.03 times the operating wavelength of the uplink antenna unit 10, and the set spacing length between the rectangular polarization metal sheet 30 and the first radiation patch and the second radiation patch is not greater than 3 mm.

[0068] Embodiment 3

[0069] As Figure 4 shown, this embodiment provides a communication terminal, which includes: a frame 40, a screen and a backplane. The screen and the backplane are arranged opposite and parallel to each other. The frame 40 surrounds and connects the edges of the screen and the backplane, and constructs an accommodation cavity between the frame 40, the screen and the backplane. An antenna device with dual-band and dual-circular polarization as provided in Embodiment 1 is arranged in the accommodation cavity. The difference from Embodiment 2 is:

[0070] Both the first - band antenna unit and the second - band antenna unit achieve the circular polarization effect by using a rectangular radiation patch with a metal slit. Specifically, the first radiation patch is a rectangular radiation patch, and the first radiation patch is provided with a horizontally - arranged first metal slit on one side adjacent to the polarization metal sheet 30 and its opposite side; the second radiation patch is a rectangular radiation patch, and the second radiation patch is provided with a horizontally - arranged second metal slit on one side adjacent to the polarization metal sheet 30 and its opposite side. By providing a metal slit on the radiation patch, it is possible to conveniently and quickly select the corresponding radiation patch and the size of the metal slit according to the operating frequency band corresponding to the antenna unit, reduce the set size of the radiation patch while increasing the bandwidth of the antenna unit, and at the same time increase the gain and axial ratio of the antenna unit.

[0071] Embodiment 4

[0072] As Figure 4 shown, this embodiment provides a communication terminal, which includes: a frame 40, a screen, and a backplane. The screen and the backplane are oppositely and parallelly arranged. The frame 40 surrounds and connects the edges of the screen and the backplane, and constructs an accommodation cavity between the frame 40, the screen, and the backplane. An antenna device with dual - band and dual - circular polarization as provided in Embodiment 1 is arranged in the accommodation cavity. The difference from Embodiment 2 is that:

[0073] Both the first - band antenna unit and the second - band antenna unit achieve the circular polarization effect by using a rectangular radiation patch with a chamfered setting. Specifically, the first radiation patch is a rectangular radiation patch, and two right - angled triangular regions located at the diagonal positions of the rectangular radiation patch are cut off from the first radiation patch; the second radiation patch is a rectangular radiation patch, and two right - angled triangular regions located at the diagonal positions of the rectangular radiation patch are cut off from the second radiation patch. By performing a chamfered setting on the radiation patch, it is possible to conveniently and quickly select the corresponding radiation patch and the size of the cut - off right - angled triangle according to the operating frequency band corresponding to the antenna unit, reduce the set size of the radiation patch while increasing the bandwidth of the antenna unit, and at the same time increase the gain and axial ratio of the antenna unit. Further, in order to simultaneously achieve the circular polarization performance of the first - band antenna unit and the second - band antenna unit respectively and improve the isolation between the first - band antenna unit and the second - band antenna unit, it is set that the chamfering direction of the rectangular radiation patch on the first radiation patch is different from the chamfering direction of the rectangular radiation patch on the second radiation patch.

[0074] Embodiment 5

[0075] As Figure 4As shown in the figure, this embodiment provides a communication terminal, which includes: a housing 40, a screen, and a backplane. The screen and the backplane are arranged opposite to each other in parallel. The housing 40 surrounds and connects the edges of the screen and the backplane, and constructs a receiving cavity between the housing 40, the screen, and the backplane. An antenna device with dual-band and dual-circular polarization as provided in Embodiment 1 is arranged in the receiving cavity. Among them, both the uplink antenna unit 10 and the downlink antenna unit 20 adopt patch antennas with chamfered corners. Different from Embodiment 4:

[0076] The receiving cavity further includes a battery 50. In the provided antenna device with dual-band and dual-circular polarization, the target operating frequency band of the uplink antenna unit 10 is 1.955 - 1.975 GHz, and the target operating frequency band of the downlink antenna unit 20 is 2.145 - 2.165 GHz. Among them, the cross-sectional dimension 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 1 mm. The polarization unit adopts a rectangular polarization metal sheet 30, and a plurality of metal slits 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, it is set that the first radiation patch and the second radiation patch are flush with one end close to the rectangular polarization metal sheet; and the set spacing length between the rectangular polarization metal sheet 30 and the first radiation patch and the second radiation patch is 0.02 times the operating wavelength of the uplink antenna unit 10, which is 3 mm; the long side dimension of the rectangular polarization metal sheet 30 is greater than 0.45 times the operating 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 operating wavelength of the uplink antenna unit 10.

[0077] Comparative Example 1

[0078] As Figure 5 shown in the figure, this comparative example provides a communication terminal. The difference between this Comparative Example 1 and Embodiment 5 is that: it does not include the polarization metal sheet 30.

[0079] Comparative Example 2

[0080] As Figure 19 shown in the figure, this comparative example uses the communication terminal provided in Embodiment 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 on the antenna device in the communication terminal in the usage scenario.

[0081] As Figures 4 - 23 shown in the figure, performance tests are carried out on the antenna device with dual-band and dual-circular polarization and the communication terminal provided in Embodiment 5, and comparative tests are carried out with the communication terminals provided in Comparative 1 and Comparative Example 2. The results are as follows:

[0082] As Figures 6 - 7As 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 - 1.975 GHz, the antenna impedance matching ≤ -10 dB and the axial ratio ≤ 3 dB; as 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; as Figures 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 within the target frequency band: 2.145 - 2.165 GHz, the antenna impedance matching ≤ -15 dB and the axial ratio ≤ 3 dB; as Figure 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.

[0083] As Figure 12 As shown, the schematic diagram of the S-parameters of the uplink antenna unit in the communication terminal provided in Embodiment 5 shows that within the target frequency band of 1.955 - 1.975 GHz, the antenna impedance matching ≤ -10 dB; as Figure 13 As shown, the schematic diagram of the gain direction of the uplink antenna unit in the communication terminal provided in Embodiment 5 shows that the main radiation direction of the antenna unit deflects from the front and back of the communication terminal to the top direction; as Figure 14 As shown, the schematic diagram of the axial ratio direction of the uplink antenna unit in the communication terminal provided in Embodiment 5 shows that at the position with better antenna gain, a pit appears in the axial ratio pattern, the axial ratio is also good, and the antenna unit exhibits good circular polarization characteristics. As Figure 15 As shown, the schematic diagram of the S-parameters of the downlink antenna unit in the communication terminal provided in Embodiment 5 shows that within the target frequency band: 2.145 - 2.165 GHz, the antenna impedance matching ≤ -10 dB; as Figure 16 As shown, the schematic diagram of the gain direction of the downlink antenna unit in the communication terminal provided in Embodiment 5 shows that the main radiation direction of the antenna unit deflects from the front and back of the communication terminal to the top direction; as Figure 17 As shown, the schematic diagram of the axial ratio direction of the downlink antenna unit in the communication terminal provided in Embodiment 5 shows that at the position with better antenna gain, a pit appears in the axial ratio pattern, the axial ratio is also good, and the antenna unit exhibits good circular polarization characteristics. As Figure 18 As shown, the isolation degree between the uplink antenna unit and the downlink antenna unit in the communication terminal provided in Embodiment 5 ≥ 20 dB.

[0084] As Figure 20As shown, the schematic diagram of the S parameters 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 - 1.975 GHz, the antenna impedance matching ≤ -10 dB, that is, the influence of the head and hand on the standing wave of the antenna unit is extremely small; as Figure 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 deflects from the front and back of the communication terminal to the top direction, that is, the influence of the head and hand on the beam of the antenna unit is very small; as Figure 22 As shown, the schematic diagram of the S parameters 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 - 2.165 GHz, the antenna impedance matching ≤ -10 dB, that is, the influence of the head and hand on the standing wave of the antenna unit is extremely small; as Figure 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 deflects from the front and back of the communication terminal to the top direction, that is, the influence of the head and hand on the beam of the antenna unit is very small; therefore, placing the antenna device on the back of the communication terminal can effectively isolate the influence of the head and hand on the performance of the antenna device.

[0085] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle 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: The antenna device is used to implement a satellite communication function in a communication terminal; It includes a first frequency band antenna unit, a second frequency band antenna unit and a polarization unit which are arranged in the same plane; 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 frequency band antenna unit adopts a first radiation patch to realize right-hand circular polarization, and the second frequency band antenna unit adopts a second radiation patch to realize left-hand circular polarization; the polarization unit adopts a polarization metal sheet, and the polarization unit is used to deflect the beam direction of the first frequency band antenna unit and the second frequency band antenna unit from the backfire direction to the endfire direction; 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 and the second radiation patch are flush with one end close to the rectangular polarizing metal sheet; the side length of the rectangular polarizing metal sheet close to one end of the first radiation patch and the second radiation patch is not less than the setting distance of the first radiation patch and the second radiation patch in the horizontal direction; The first radiation patch, the second radiation patch and the polarizing metal sheet are arranged on the back plate of the communication terminal, and the polarizing metal sheet is arranged close to the top edge of the back plate of the communication terminal; The first frequency band antenna unit is an uplink antenna unit, and the second frequency band antenna unit is a downlink antenna unit; 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; 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; A plurality of metal gaps are arranged on the polarizing metal sheet.

2. 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.

3. 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 1-2, 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.

4. The communication terminal according to claim 3, 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.

5. The communication terminal according to claim 3, 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.

6. The communication terminal according to claim 3, characterized in that: The first radiation patch is flush with one end of the second radiation patch close to 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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