Handheld antenna system

Abstract

This utility model relates to the technical field of handheld devices, and provides a handheld device antenna system, including a handheld device body, a built-in antenna, an external B2b receiving antenna, and an external dual-mode antenna. The handheld device body has an RF interface on one side; the built-in antenna is located on the top of the handheld device body; the external B2b receiving antenna has a plug-in connector at its end for pluggable connection to the RF interface; the external dual-mode antenna has a connection port on one side, which is pluggable to the RF interface via a connecting cable. This utility model, by configuring three antenna structures on the same handheld device, allows for more operating frequencies, a wider operating bandwidth, and enables a wider short message communication service area through the selection of two external antennas. It also improves system capacity, enhances single-communication capability, and increases single-beam downlink speed.

Description

Technical Field

[0001] This utility model relates to the technical field of handheld devices, and more particularly to a handheld device antenna system. Background Technology

[0002] The BeiDou-3 handheld device is a handheld communication device based on the BeiDou-3 global satellite navigation system. It can perform multiple functions such as global positioning and timing, regional short message communication and positioning reports, global short message communication and location reports, and emergency search and rescue.

[0003] In related technologies, the antenna system of handheld devices occupies a large volume, which is not conducive to carrying. Moreover, when the handheld device is in a shelter or other scenarios where signals are blocked, it will greatly affect the positioning accuracy and communication efficiency. Utility Model Content

[0004] This invention provides a handheld antenna system to address the shortcomings of existing technologies, such as large size and difficulty in switching in weak signal scenarios.

[0005] This utility model provides a handheld device antenna system, including: a handheld device body, a built-in antenna, an external B2b receiving antenna, and an external dual-mode antenna. The handheld device body has a radio frequency interface on one side; the built-in antenna is located on the top of the handheld device body; the external B2b receiving antenna has a plug-in connector at its end, which is used for pluggable connection to the radio frequency interface; the external dual-mode antenna has a connection port on one side, which is pluggable connected to the radio frequency interface via a connecting cable.

[0006] According to the handheld antenna system provided by this utility model, the built-in antenna includes a circuit board and an S-band ceramic antenna vibrator, an L-band ceramic antenna vibrator, and a B3-band ceramic antenna vibrator disposed on one side of the circuit board. The S-band ceramic antenna vibrator and the L-band ceramic antenna vibrator are stacked together and arranged side by side with the B3-band ceramic antenna vibrator. The S-band ceramic antenna vibrator is located above the L-band ceramic antenna vibrator, and the B3-band ceramic antenna vibrator is located on the side away from the radio frequency interface.

[0007] According to the handheld antenna system provided by this utility model, the circuit board has three radio frequency connectors on the side facing away from the antenna vibrator. The three radio frequency connectors are connected to the S-band ceramic antenna vibrator, the L-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator in a one-to-one correspondence.

[0008] According to the handheld antenna system provided by this utility model, in the width direction of the handheld body, the distance between the B3 band ceramic antenna vibrator and the external B2b receiving antenna body is 75mm≤D1≤82mm.

[0009] According to the handheld antenna system provided by this utility model, in the length direction of the handheld body, the distance between the circuit board and the radio frequency interface is 30mm≤D2≤35mm.

[0010] According to the handheld antenna system provided by this utility model, each outer wall of the S-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator is provided with a silver auxiliary patch.

[0011] According to the handheld antenna system provided by this utility model, the feed points of each auxiliary patch on the outer sidewall of the S-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator are all offset from the geometric central axis, so that each auxiliary patch on the S-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator has an asymmetrical structure about its geometric central axis.

[0012] According to the handheld antenna system provided by this utility model, the handheld antenna system further includes an antenna switching module. The output terminal of the antenna switching module is electrically connected to the S-band ceramic antenna vibrator, the L-band ceramic antenna vibrator, and the B3-band ceramic antenna vibrator, respectively. The antenna switching module includes a switching switch and a current detection circuit. The current detection circuit is used to collect the operating current signal of the handheld device, and the output terminal of the current detection circuit is electrically connected to the control terminal of the switching switch circuit. The common terminal of the switching switch circuit serves as the input terminal of the antenna switching module, and the selection terminals serve as the output terminals of the antenna switching module.

[0013] According to the handheld antenna system provided by this utility model, the external B2b receiving antenna includes an active quad-arm helical antenna.

[0014] According to the handheld antenna system provided by this utility model, the external dual-mode antenna includes a one-wire active antenna.

[0015] The handheld antenna system provided by this utility model, by configuring three antenna structures on the same handheld device, enables more operating frequency points, wider operating bandwidth, and can achieve a wider range of short message communication service areas through the selection of two external antennas. The system capacity is improved, the single communication capability is strong, and the single beam downlink rate is fast. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is one of the overall structural schematic diagrams of the handheld antenna system provided by this utility model.

[0018] Figure 2 This is the second schematic diagram of the overall structure of the handheld antenna system provided by this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the built-in antenna in the handheld antenna system provided by this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the external B2b receiving antenna in the handheld antenna system provided by this utility model.

[0021] Figure 5 This is a block diagram of the internal structure of the external dual-mode antenna in the handheld antenna system provided by this utility model.

[0022] Figure label: 10. Handheld device body; 11. RF interface; 20. Built-in antenna; 21. S-band ceramic antenna vibrator; 22. L-band ceramic antenna vibrator; 23. B3-band ceramic antenna vibrator; 24. Circuit board; 25. RF connector; 26. Auxiliary patch; 30. External B2b receiving antenna; 31. Plug-in connector; 32. Antenna body; 40. External dual-mode antenna; 41. Connection port; 42. Connection cable. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0026] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] Regarding the problems in related technologies, such as Figure 1 , Figure 2As shown, a handheld antenna system of this utility model includes a handheld device body 10, a built-in antenna 20, an external B2b receiving antenna 30, and an external dual-mode antenna 40. The handheld device body 10 is provided with a radio frequency interface 11 on one side; the built-in antenna 20 is located on the top of the handheld device body 10; the external B2b receiving antenna 30 is provided with a plug-in connector 31 at its end, which is used to connect to the radio frequency interface 11 in a pluggable manner; the external dual-mode antenna 40 is provided with a connection port 41 on one side, which is connected to the radio frequency interface 11 in a pluggable manner through a connecting cable 42. The handheld device is used for field positioning and navigation. It needs to have stable positioning and communication functions in complex environments and be easy to carry. In this embodiment, an antenna system is formed by a built-in antenna 20 and two external antennas. This makes the antenna system have more operating frequencies, wider operating bandwidth, and wider coverage. Furthermore, by setting an RF interface 11 on one side of the handheld device body 10, and by placing the built-in antenna 20 on the top and connecting the external antennas to the side through the RF interface 11, the overall structure of the handheld device is more compact and easy to carry.

[0029] Specifically, the handheld device 10 typically includes a housing, physical buttons or a touch screen, a motherboard, and a power supply. The physical buttons or touch screen are located on the housing, and the motherboard is located inside the housing and electrically connected to the physical buttons or touch screen to enable control via the physical buttons or touch screen. The antenna system is located on the top of the housing and enables positioning and communication via the antenna system.

[0030] The external B2b receiving antenna 30 and the external dual-mode antenna 40 can be selectively plugged in via the RF interface 11, meaning they can be connected as needed. For example, the external B2b receiving antenna 30 can be connected in an open outdoor environment, while the external dual-mode antenna 40 can be placed in an open outdoor area and connected to the mobile phone via the connecting cable 42 when indoors or in situations with obstructions.

[0031] Understandably, compared to traditional handheld devices, this example uses the RF port on the side of the handheld device to achieve quick-connect connection between the external B2b receiving antenna 30 and the external dual-mode antenna 40, making the handheld device more flexible and enabling rapid switching in different scenarios. Furthermore, the use of two external antennas allows for more operating frequency points and a wider operating bandwidth.

[0032] In the specific configuration, the radio frequency interface 11 is located near the upper part of the handheld device body 10, and there is a preset distance between the radio frequency interface 11 and the built-in antenna 20. This configuration makes the overall structure of the handheld device more compact and easy to carry, and also maintains a certain distance from the built-in antenna 20 to avoid mutual interference.

[0033] In some embodiments, such as Figure 3 As shown, the built-in antenna 20 includes a circuit board 24 and an S-band ceramic antenna vibrator 21, an L-band ceramic antenna vibrator 22, and a B3-band ceramic antenna vibrator 23 disposed on one side of the circuit board 24. The S-band ceramic antenna vibrator 21 and the L-band ceramic antenna vibrator 22 are stacked and arranged side by side with the B3-band ceramic antenna vibrator 23. The S-band ceramic antenna vibrator 21 is located above the L-band ceramic antenna vibrator 22, and the B3-band ceramic antenna vibrator 23 is located on the side away from the RF interface 11. The built-in antenna 20 is located in the bottom area of ​​the handheld device body 10. In this embodiment, by stacking the S-band ceramic antenna vibrator 21 and the L-band ceramic antenna vibrator 22, the overall size of the antenna can be effectively reduced, making the structure of the built-in antenna 20 more compact and reducing its space occupancy.

[0034] Specifically, both the S-band ceramic antenna element 21 and the L-band ceramic antenna element 22 are constructed as block-shaped structures. The S-band ceramic antenna element 21 is located on the upper surface of the L-band ceramic antenna element 22, and the size of the S-band ceramic antenna element 21 is smaller than that of the L-band ceramic antenna element 22. This allows the S-band ceramic antenna element 21 and the L-band ceramic antenna element 22 to have antenna patches of suitable area, enabling communication in their respective frequency bands.

[0035] Specifically, the B3 band ceramic antenna vibrator 23 is located far away from the radio frequency interface 11. That is, the B3 band ceramic antenna vibrator 23 can be kept away from the external B2b receiving antenna 30 and the external dual-mode antenna 40. This can avoid mutual interference between the B3 band ceramic antenna vibrator 23 and the B2b receiving antenna, and improve the overall performance and signal quality of the communication system.

[0036] In some specific embodiments, the built-in antenna 20 is constructed as a rectangular structure with dimensions of 67.6×22×14.8mm (length×width×thickness). By limiting the size, the overall space occupied can be greatly reduced (the size of the traditional built-in antenna 20 is 62×45×17.5mm). Compared with the size of the traditional built-in antenna 20, the size and volume of the built-in antenna 20 in this embodiment are reduced.

[0037] Furthermore, such as Figure 4 As shown, the external B2b receiving antenna 30 includes a cylindrical antenna body and a plug-in connector 31 located at the end of the antenna body. The antenna body has a size of φ18.8×60mm. The external dual-mode antenna 40 is generally cylindrical in shape and has a size of φ106×60mm. Compared with the size of the traditional external source antenna of φ124×60.5mm, the volume of the external dual-mode antenna 40 in this embodiment is reduced by 28%, which is beneficial for the portability of handheld devices.

[0038] In specific configuration, the S-band ceramic antenna element 21 has a bandwidth of 2491.75±8.16MHz, and the L-band ceramic antenna element 22 has a bandwidth of 1618.24±8.16MHz. This is a significant improvement over the bandwidth of the built-in antenna 20 in traditional handheld devices. Furthermore, the external B2b receiving antenna 30 has a bandwidth of 1207.14±10.23MHz, enabling BeiDou-3 global short message communication with a global service area. The maximum single communication capacity is 1000 Chinese characters. This significantly improves the coverage and communication capabilities of the handheld device antenna system.

[0039] It is understandable that, such as Figure 1 As shown, in this embodiment, the built-in antenna 20 and the external B2b receiving antenna 30 adopt a high-isolation layout design. The built-in B3 band ceramic antenna vibrator 23 is separately located on the top left of the handheld device, while the S-band ceramic antenna vibrator 21 and L-band ceramic antenna vibrator 22 are stacked on the top right of the handheld device. The external B2b receiving antenna 30 is located on the right side of the handheld device and is easily installed and removed via a plug-in connector 31. When the handheld device only needs to perform area RDSS, the external B2b receiving antenna 30 can be actively removed to reduce the power consumption of the handheld device and increase its battery life.

[0040] In specific configurations, the S-band ceramic antenna element 21 uses ceramic with a dielectric constant of 13.8 and a dielectric loss tangent of 0.006, with dimensions of 27×27×7.5mm. The distance between the antenna feed point and the ceramic center is 3.2mm, and the resonant frequency is 2491.75±8.16MHz. The L-band ceramic antenna element 22 uses ceramic with a dielectric constant of 19.8 and a dielectric loss tangent of 0.003, with dimensions of 33×33×12mm. The distance between the antenna feed point and the ceramic center is 3.2mm, and the resonant frequency is 1618.24±8.16MHz. The B3-band ceramic antenna element 23 uses ceramic with a dielectric constant of 31 and a dielectric loss tangent of 0.003, with dimensions of 33×33×12mm. The distance between the antenna feed point and the ceramic center is 3.2mm, and the resonant frequency is 1268.52±10.23MHz. The larger the area of ​​silver printing on the top surface of the ceramic, the lower the antenna resonant frequency. The greater the distance between the antenna feed point and the center of the ceramic, the larger the real part of the antenna impedance. The final matching position of the feed point makes the real part of the antenna reach 50 ohms. Printing silver all over the bottom of the ceramic maximizes the grounding area and improves communication quality.

[0041] In conjunction with the above embodiments, the circuit board 24 has three RF connectors 25 on the side facing away from the antenna vibrator. These three RF connectors 25 are connected one-to-one with the S-band ceramic antenna vibrator 21, the L-band ceramic antenna vibrator 22, and the B3-band ceramic antenna vibrator 23. When installing the built-in antenna 20, it needs to be installed inside the handheld device. In this embodiment, the RF connectors 25 facilitate faster installation.

[0042] Specifically, by setting three antenna elements on one side of the circuit board 24 and correspondingly setting three radio frequency connectors 25 on the other side, a modular structure is formed for the built-in antenna 20. This facilitates mass production, reduces assembly difficulty, and improves assembly efficiency.

[0043] In specific configurations, the RF connector 25 includes an MCX (Micro Coaxial) connector or an SMP (Sub-Miniature Push-on) connector, which allows the device to connect directly to the device module within the handheld unit, improving the ease of assembly and connection. By limiting it to an MCX or SMP connector, it achieves a compact and miniaturized design, making the structure of the built-in antenna 20 more compact and reducing its space occupation.

[0044] It is understood that in this embodiment, the built-in antenna 20 adopts a modular structure, which enables efficient production during mass production. It can also be connected to the RF module of the handheld device by means of the RF connector 25, which can reduce the difficulty of assembling the built-in antenna 20 and improve its assembly and production efficiency.

[0045] In some embodiments, the distance between the B3 band ceramic antenna vibrator 23 and the external B2b receiving antenna 30 body in the width direction of the handheld device body 10 is 75mm≤D1≤82mm. The distance between the B3 band ceramic antenna vibrator 23 and the external B2b receiving antenna 30 body affects the isolation effect. This embodiment achieves better isolation between the two by limiting this distance.

[0046] Specifically, simulation calculations show that, within the aforementioned limited distance range, the isolation between the B3 band ceramic antenna element 23 and the external B2b receiving antenna 30 is better than 15dB, thus improving communication quality.

[0047] Understandably, an excessive distance between the B3 band ceramic antenna element 23 and the external B2b receiving antenna 30 would result in an overly large handheld device that is inconvenient to carry. This embodiment, by limiting the distance between the two, allows the handheld device to achieve both a compact antenna layout and good isolation.

[0048] In specific settings, the distance D1 between the B3 band ceramic antenna vibrator 23 and the main body of the external B2b receiving antenna 30 is 75mm, 76mm, 77mm, 78mm, 79mm, 80mm, 81mm or 82mm.

[0049] In conjunction with the above embodiments, the distance between the circuit board 24 and the radio frequency interface 11 along the length of the handheld device body 10 is 30mm ≤ D2 ≤ 35mm. The distance between the circuit board 24 and the radio frequency interface 11 also affects the isolation effect. By limiting this distance, this embodiment can achieve better isolation between the two.

[0050] Specifically, simulation calculations show that, within the aforementioned limited distance range, the isolation between the B3 band ceramic antenna element 23 and the external B2b receiving antenna 30 is better than 15dB, thus improving communication quality.

[0051] Understandably, an excessive distance between the circuit board 24 and the RF interface 11 would result in an overly large overall size of the handheld device, making it inconvenient to carry. This embodiment, by limiting the distance between the two, enables the handheld device to achieve both a compact antenna layout and good isolation.

[0052] In specific settings, the distance D2 between the circuit board 24 and the RF interface 11 is 30mm, 31mm, 32mm, 33mm, 34mm or 35mm.

[0053] In a specific implementation, the distance D1 between the B3 band ceramic antenna vibrator 23 and the main body of the external B2b receiving antenna 30 is 78.6 mm in the width direction and 33 mm in the length direction. At this distance, simulation and actual test results show that the isolation between the B3 band ceramic antenna vibrator 23 and the external B2b receiving antenna 30 is better than 15 dB.

[0054] In some embodiments, a silver auxiliary patch 26 is provided on each outer wall of the S-band ceramic antenna element 21 and the B3-band ceramic antenna element 23. The auxiliary patch 26 can improve the stability of antenna communication and enhance communication quality.

[0055] Specifically, the placement of the auxiliary patch 26 effectively utilizes the space on the sidewall of the antenna element, allowing the built-in antenna 20 to maintain a compact structure while ensuring its operational efficiency. Furthermore, the sidewall mounting allows for a more balanced radiation pattern at different angles, contributing to an expanded coverage area.

[0056] Understandably, by setting the auxiliary patch 26 on the side wall as an antenna patch, it can not only optimize space utilization, increase radiation coverage, reduce interference and signal reflection, but also improve the performance of multi-antenna systems, support multi-band communication, and improve the heat dissipation and anti-interference capabilities of the equipment.

[0057] In conjunction with the above embodiments, the feed points of each auxiliary patch 26 on the outer sidewalls of the S-band ceramic antenna vibrator 21 and the B3-band ceramic antenna vibrator 23 are not located on the geometric central axis of the patch, so that each auxiliary patch 26 on the S-band ceramic antenna vibrator 21 and the B3-band ceramic antenna vibrator 23 has an asymmetrical structure about its geometric central axis.

[0058] Specifically, auxiliary patches 26 are provided on the outer walls of both the S-band ceramic antenna vibrator 21 and the B3-band ceramic antenna vibrator 23. The asymmetrical radiation characteristics of the auxiliary patches 26 improve the low elevation angle non-circularity of the receiving antenna.

[0059] It is understood that, in this embodiment, the antenna patch with asymmetrical feed point in the built-in antenna 20 can significantly improve the antenna's performance in complex environments by changing its radiation characteristics, directivity, bandwidth, and anti-interference capabilities. Especially in multi-antenna systems, the asymmetrical structure can effectively reduce interference between antennas and improve the overall performance of the system.

[0060] In some embodiments, the handheld antenna system further includes an antenna switching module. The output of the antenna switching module is electrically connected to the S-band ceramic antenna element 21, the L-band ceramic antenna element 22, and the B3-band ceramic antenna element 23, respectively. The antenna switching module includes a switching switch and a current detection circuit. The current detection circuit is used to collect the operating current signal of the handheld device, and its output is electrically connected to the control terminal of the switching switch circuit. The common terminal of the switching switch circuit serves as the input terminal of the antenna switching module, and the selected terminals serve as the output terminals. In this embodiment, there is a built-in antenna 20, an external B2b receiving antenna 30, and an external dual-mode antenna 40. When different antennas are operating, the corresponding built-in antenna 20 needs to be switched. This embodiment improves its adaptability by controlling the switching of the built-in antenna 20 between antenna elements in different frequency bands through the antenna switching module.

[0061] Specifically, when the handheld device is in operation, the current detection circuit monitors the device's operating current and generates corresponding signals. These signals are sent to the control terminal of the switch. Based on changes in the current signal, the switch selects the appropriate antenna element for connection. For example, if the device operates in the S-band, after the current detection circuit detects a specific current signal, the switch automatically selects the S-band antenna element as the output, allowing the signal to be transmitted through the S-band antenna. If the device switches to the L-band, the current detection circuit changes the control signal, and the switch selects the L-band antenna, and so on.

[0062] The different operating modes of the antenna system in the above embodiments are described below.

[0063] Regional short message communication working mode: When the satellite signal strength is good, the handheld device only uses the built-in antenna 20 and the built-in S-band ceramic antenna vibrator 21 to receive and demodulate the S-frequency signal of the Beidou satellite navigation system regional short message, and the built-in L-band ceramic antenna vibrator 22 to send Lf1~Lf3 frequency signals, realizing regional short message communication, location report transmission and reception, and regional emergency search and rescue business functions. Based on the single regional short message communication capability of up to 1000 Chinese characters, voice and image transmission functions are realized.

[0064] Global short message communication working mode: When the satellite signal strength is good, the handheld device connects to the external B2b receiving antenna 30. The handheld device automatically identifies the antenna based on its operating current. When the antenna operating current is detected to be 20mA~30mA, it determines that an external B2b antenna is connected and provides a prompt. The handheld device receives and demodulates the B2b frequency signal through the external B2b receiving antenna 30, automatically measures whether the signal gain at the port front end is between 35dB and 40dB, and transmits the LF4 signal through the handheld device's built-in antenna 20 to realize global short message communication, location reporting, and global emergency search and rescue functions.

[0065] In situations where the BeiDou signal is severely obstructed, such as in trenches or indoor bunkers, the regional short message communication mode works as follows: The user places the external dual-mode antenna 40 in an open outdoor location and connects it to a handheld device via an RF cable. The handheld device automatically identifies the antenna based on its operating current. When the antenna operating current is ≥70mA, it determines that it is an external ordinary dual-mode antenna and provides a prompt. The external dual-mode antenna 40 receives and demodulates the BeiDou satellite navigation system regional short message S-frequency signal through its S-antenna and transmits Lf1~Lf3 frequency signals through its L-antenna, thus realizing regional short message communication.

[0066] In situations where BeiDou signals are severely obstructed, such as in trenches or indoor bunkers, the global short message communication operation mode is as follows: The user places the external dual-mode antenna 40 in an open outdoor location and connects it to a handheld device via an RF cable. The handheld device automatically identifies the antenna based on its operating current. If the antenna operating current is ≥70mA, it determines that it is an external dual-mode antenna 40 and provides a prompt. It automatically measures whether the received input power is within -70dBm to -60dBm (B2b frequency) and whether the output power is within -5dBm to -3dBm (L frequency). The external dual-mode antenna 40 receives and demodulates the global short message B2b frequency signal through its B2b antenna and transmits the Lf4 frequency signal through its L antenna, thus realizing global short message communication, location reporting, and global emergency search and rescue functions.

[0067] As can be seen from the above model, when switching antennas, the switching is achieved by judging the operating current of the antenna switching module. In specific applications, one of the modules from Skyworks SKY13349-375LF and Qorvo TQG1105 can be selected as the antenna switching module to achieve the switching of the antenna elements.

[0068] In conjunction with the foregoing embodiments, the external B2b receiving antenna 30 includes an active quadruple-arm helical antenna. By defining the antenna, it achieves superior communication quality.

[0069] Specifically, the active quad-arm helical antenna is a conventional antenna structure. Internally, it consists of four helical patches, each 0.25λ in length. The four helical arms are fed with equal current amplitudes and are 90 degrees out of phase with each pair. The helical patches are wrapped around a cylindrical surface composed of a flexible PCB board with a dielectric constant of 3 and a thickness of 0.5mm. The bottom consists of a circular low-noise amplifier circuit board 24. A conformal radome is designed on the outside of the antenna to protect it from deformation and provide waterproofing. The connector at the antenna end is a direct-plug connector such as an MCX or SMP connector, designed to match the RF interface of the handheld device for easy assembly and disassembly. When the handheld device only needs to perform area RDSS, the external B2b receiving antenna 30 can be actively detached to achieve a power-saving design.

[0070] It should be noted that the active quad-arm helical antenna is a mature device in this field, so its specific internal structure will not be described in detail.

[0071] In conjunction with the foregoing embodiments, the external dual-mode antenna 40 includes a one-wire active antenna. By defining the external dual-mode antenna 40, its deployment is simplified, facilitating field operations. Furthermore, by simplifying wiring, reducing interference, improving signal quality, supporting multi-band reception, reducing size, and enhancing reliability, it provides a convenient, reliable, and efficient solution for various application scenarios.

[0072] Specifically, such as Figure 5 As shown, the one-line active antenna uses a conventional antenna structure, internally comprising an S / L / B3 / B2 / B1 stacked microstrip antenna, B3 / B2 low-noise amplifier, B1 low-noise amplifier, S low-noise amplifier, L-channel power amplifier, power divider / combiner, RF / power separation module, and power system. The antenna receives signals from the air at frequencies B3 / B2, B1, and S, and transmits the L-frequency signal. The B3 / B2, B1, and S-channel low-noise amplifiers amplify and filter the received B3 / B2, B1, and S signals. The L-channel power amplifier amplifies and filters the L-frequency RF signal and automatically detects the L-channel signal strength, generating a power amplifier enable control signal. The RF signal separated by the power divider / combiner contains signals from the B3 / B2, B1, S, and L channels. This RF signal is then split into three paths, one for the B3 / B2, B1, and S low-noise amplifier / filter channels, and the other for the L-channel power amplifier / filter channel. Because the RF signal and power supply are transmitted together from the host to the external antenna via RF cable, the RF / power separation module separates the RF signal and DC power supply. The power system provides various suitable power supplies for the entire external standard dual-mode antenna, including low-noise amplifier power and power amplifier power.

[0073] It should be noted that the One-Line Active Antenna is a mature device in this field, so its internal detailed structure will not be described in detail.

[0074] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment, using an antenna system composed of three antennas, has more operating frequencies and a wider operating bandwidth. Handheld devices using this antenna system can achieve short message communication services globally, with improved system capacity, strong single-communication capability, and fast single-beam downlink speed. Furthermore, auxiliary radiating patches are designed on the four sides of the two ceramic elements in the built-in antenna 20, effectively increasing the number of auxiliary radiating patches. The asymmetrical radiation characteristics of these auxiliary radiating patches improve the low-elevation-angle non-circularity of the receiving antenna, thereby increasing its sensitivity. Furthermore, the layout of the built-in antenna 20 and the external B2b receiving antenna 30 provides higher isolation. Furthermore, the antenna switching module automatically identifies the type of the external antenna based on the antenna load current and automatically switches between the built-in antenna 20 and the external antenna, accurately allocating the use of a designated antenna as the receiving antenna and the use of a designated antenna as the transmitting antenna.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A handheld device antenna system, characterized in that, include: The handheld device body has a radio frequency interface on one side; An internal antenna is provided, which is located on the top of the handheld device body; An external B2b receiving antenna is provided at its end with a plug-in connector for pluggable connection to the radio frequency interface. An external dual-mode antenna is provided on one side, and the connection port is detachably connected to the radio frequency interface via a connecting cable.

2. The handheld antenna system according to claim 1, characterized in that, The built-in antenna includes a circuit board and an S-band ceramic antenna vibrator, an L-band ceramic antenna vibrator and a B3-band ceramic antenna vibrator disposed on one side of the circuit board. The S-band ceramic antenna vibrator and the L-band ceramic antenna vibrator are stacked together and arranged side by side with the B3-band ceramic antenna vibrator. The S-band ceramic antenna vibrator is located above the L-band ceramic antenna vibrator, and the B3-band ceramic antenna vibrator is located on the side away from the radio frequency interface.

3. The handheld antenna system according to claim 2, characterized in that, The circuit board has three radio frequency connectors on the side facing away from the antenna vibrator. The three radio frequency connectors are connected to the S-band ceramic antenna vibrator, the L-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator respectively.

4. The handheld antenna system according to claim 2, characterized in that, In the width direction of the handheld device body, the distance between the B3 band ceramic antenna vibrator and the external B2b receiving antenna body is 75mm≤D1≤82mm.

5. The handheld antenna system according to claim 2 or 4, characterized in that, Along the length of the handheld device body, the distance between the circuit board and the radio frequency interface is 30mm≤D2≤35mm.

6. The handheld antenna system according to claim 2, characterized in that, Each outer wall of the S-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator is provided with a silver auxiliary patch.

7. The handheld antenna system according to claim 6, characterized in that, The feed points of each auxiliary patch on the outer sidewall of the S-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator are all offset from the geometric central axis, so that each auxiliary patch on the S-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator has an asymmetrical structure about its geometric central axis.

8. The handheld antenna system according to claim 2, characterized in that, The handheld antenna system also includes an antenna switching module, the output of which is electrically connected to the S-band ceramic antenna vibrator, the L-band ceramic antenna vibrator and the B3-band ceramic antenna vibrator respectively; The antenna switching module includes a switching switch and a current detection circuit. The current detection circuit is used to collect the operating current signal of the handheld device. The output terminal of the current detection circuit is electrically connected to the control terminal of the switching switch circuit. The common terminal of the switching switch circuit serves as the input terminal of the antenna switching module, and the selected terminals serve as the output terminals of the antenna switching module.

9. The handheld antenna system according to claim 1, characterized in that, The external B2b receiving antenna includes an active quad-arm helical antenna.

10. The handheld antenna system according to claim 1, characterized in that, The external dual-mode antenna includes a one-wire active antenna.

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