A mobile terminal based on NTN satellite antenna band adjustment

Abstract

The utility model discloses a kind of mobile terminal based on NTN satellite antenna's frequency band adjustment, including fuselage shell and the circuit board being set in fuselage shell, integrated processor, radio frequency transceiver circuit and selector switch circuit on circuit board;The metal outer frame of fuselage shell is disconnected into several sections, and communication antenna group, NTN satellite antenna and parasitic antenna are formed;Communication antenna group and parasitic antenna are all connected radio frequency transceiver circuit;Processor connects radio frequency transceiver circuit and selector switch circuit, and selector switch circuit connects processor, radio frequency transceiver circuit and NTN satellite antenna.Processor controls the switching state of selector switch circuit according to current operating frequency band, and satellite communication is carried out with parasitic antenna combination after NTN satellite antenna is switched to corresponding frequency band.Utilize metal outer frame to make multiple antennas, without increasing fuselage thickness, miniaturization requirement is realized;Through the selection switching of selector switch circuit, the adjustment of antenna frequency band is realized.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency technology, and in particular to a mobile terminal based on frequency band adjustment of an NTN satellite antenna. Background Technology

[0002] NTN (non-terrestrial network) is a technology developed by 3GPP (3rd Generation Partnership Project) in Release 17, which enables direct communication between terminals and satellites based on New Radio (NR) technology. NTN integrates satellite communication networks with terrestrial 5G networks, providing ubiquitous coverage regardless of terrain, connecting air, space, land, and sea to form an integrated, on-demand access solution across all scenarios. NTN includes NTN-IoT and NTN-NR. NTN-IoT focuses on supporting low-complexity satellite IoT services, while NTN-NR uses the 5G NR (New Radio) framework to enable smartphones to directly connect to satellites to provide data and voice services.

[0003] Satellite communication has become an integral part of cellular communication networks, providing wider coverage areas for 5G networks, such as remote and hard-to-reach areas, and coverage for mobile platforms such as airplanes and high-speed trains; it also provides additional connectivity reliability for machine-to-machine / Internet of Things (IoT) connections; it serves as a means of post-disaster network recovery and emergency communication in emergency situations, and meets the needs of extreme wing-walking sports.

[0004] In traditional technologies, ceramic materials are often used for NTN satellite antennas to achieve NTN communication, with the ceramic antenna being installed inside the product; or dual-polarized antennas are used for satellite communication. These antennas are relatively large, increasing the thickness of the device and affecting the aesthetics of the design. Due to the large size and space constraints, the design also needs to consider factors such as airspace avoidance and interference, increasing the design complexity.

[0005] Therefore, the existing technology still needs to be improved and enhanced. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a mobile terminal based on the frequency band adjustment of NTN satellite antenna, so as to solve the problem of the large size of the existing NTN satellite antenna and the increase in body thickness.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A mobile terminal based on NTN satellite antenna frequency band adjustment includes a housing and a circuit board disposed inside the housing. The circuit board integrates a processor and radio frequency transceiver circuits. The circuit board also integrates a selection switch circuit. The metal frame of the housing is broken into several segments to form a communication antenna group, an NTN satellite antenna and a parasitic antenna. Both the communication antenna group and the parasitic antenna are connected to the radio frequency transceiver circuit; the processor is connected to the radio frequency transceiver circuit and the selection switch circuit, and the selection switch circuit is connected to the processor, the radio frequency transceiver circuit and the NTN satellite antenna; The processor controls the switching state of the selection switch circuit according to the current operating frequency band, and switches the NTN satellite antenna to the corresponding frequency band and combines it with the parasitic antenna to perform satellite communication.

[0008] In the aforementioned mobile terminal with frequency band adjustment based on NTN satellite antenna, the metal frame is broken into 8 segments, with a preset distance between each segment.

[0009] In the mobile terminal with frequency band adjustment based on NTN satellite antenna, the first metal frame located in the top center is set as the NTN satellite antenna, the second metal frame with an arc located in the upper left corner is set as the parasitic antenna, the third metal frame with an arc located in the upper right corner is set as the diversity antenna, the fourth metal frame located on the right side is set as the first 5G antenna, the fifth metal frame with an arc located in the lower right corner is set as the second 5G antenna, the sixth metal frame located in the bottom center is set as the main antenna, the seventh metal frame with an arc located in the lower left corner is set as the third 5G antenna, and the eighth metal frame located on the left side is set as the fourth 5G antenna.

[0010] In the mobile terminal with frequency band adjustment based on NTN satellite antenna, the selection switch circuit includes a first switch, a second switch, a coaxial interface, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor. The VDD pin of the first switch and the VDD pin of the second switch are connected to the power supply voltage. The CTRL pins of both the first and second switches are connected to the control pins of the processor. The GND pins of both the first and second switches are grounded. The RF1 pin of the first switch is connected to one end of the first capacitor and one end of the second capacitor. The other end of the first capacitor is connected to the RF2 pin of the first switch, one end of the third capacitor, and the first main feed point of the NTN satellite antenna. The other ends of the second and third capacitors are grounded. The RF1 pin of the second switch is connected to one end of the fourth and fifth capacitors and the second main feed point of the NTN satellite antenna. The RF2 pin of the second switch is connected to the other end of the fourth capacitor, one end of the sixth capacitor, and the OUT pin of the coaxial interface. The other ends of the fifth and sixth capacitors are grounded. The IN pin of the coaxial interface is connected to the RF transceiver circuit, and the GND pin of the coaxial interface is grounded.

[0011] In the mobile terminal with frequency band adjustment based on NTN satellite antenna, the selection switch circuit further includes a first resistor, which is connected between the RF2 pin of the second switch and the OUT pin of the coaxial interface.

[0012] In the mobile terminal based on NTN satellite antenna frequency band adjustment, the length of the first metal frame segment ranges from 27 to 30 mm.

[0013] Compared to existing technologies, the mobile terminal based on NTN satellite antenna frequency band adjustment provided by this utility model includes a casing and a circuit board disposed within the casing. The circuit board integrates a processor, an RF transceiver circuit, and a selection switch circuit. The metal frame of the casing is divided into several segments, forming a communication antenna group, an NTN satellite antenna, and a parasitic antenna. Both the communication antenna group and the parasitic antenna are connected to the RF transceiver circuit. The processor is connected to the RF transceiver circuit and the selection switch circuit, which in turn connects the processor, the RF transceiver circuit, and the NTN satellite antenna. The processor controls the switching state of the selection switch circuit according to the current operating frequency band, switching the NTN satellite antenna to the corresponding frequency band and combining it with the parasitic antenna for satellite communication. Utilizing a metal frame to form the NTN satellite antenna, parasitic antenna, and various types of communication antennas eliminates the need to increase the casing thickness, achieving the miniaturization requirement of the mobile terminal. Changing the operating frequency band of the NTN satellite antenna through the selection switch circuit enables antenna frequency band adjustment and expands the antenna bandwidth. Attached Figure Description

[0014] Figure 1 This is a structural block diagram of a mobile terminal based on NTN satellite antenna frequency band adjustment provided by this utility model.

[0015] Figure 2 This is a schematic diagram of the metal frame and multiple antennas provided by this utility model.

[0016] Figure 3 This is a circuit diagram of the selection switch circuit provided by this utility model. Detailed Implementation

[0017] This invention provides a mobile terminal based on frequency band adjustment using an NTN satellite antenna. To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, the following detailed description, with reference to the accompanying drawings and embodiments, further illustrates the invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0018] Please also refer to Figure 1 and Figure 2The mobile terminal (such as a rugged phone) based on NTN satellite antenna frequency band adjustment provided by this utility model includes a casing and a circuit board (PCB board, printed circuit board) disposed inside the casing. The circuit board integrates a processor 100, an RF transceiver circuit 200, and a selection switch circuit 300. The metal frame of the casing is broken into several segments, forming a communication antenna group 400, an NTN satellite antenna 500, and a parasitic antenna 600. Both the communication antenna group 400 and the parasitic antenna 600 are connected to the RF transceiver circuit 200. The processor 100 is connected to the RF transceiver circuit 200 and the selection switch circuit 300, which in turn connects the processor 100, the RF transceiver circuit 200, and the NTN satellite antenna 500. The communication antenna group 400 is used for mobile communication. The processor 100 controls the switching state of the selection switch circuit 300 according to the current operating frequency band, switching the NTN satellite antenna 500 to the corresponding frequency band and combining it with the parasitic antenna 600 for satellite communication.

[0019] By utilizing a metal frame to create NTN satellite antennas, parasitic antennas, and various types of communication antennas, the miniaturization requirements of mobile terminals are met without increasing the thickness of the device. The frequency band of the NTN satellite antenna can be changed by selecting and switching the switch circuit. When combined with the parasitic antenna 600, it operates in the most suitable frequency band, realizing the adjustment of the antenna frequency band and expanding the antenna bandwidth.

[0020] In this embodiment, as Figure 2 As shown, the metal frame is divided into 8 segments. Each segment is used to create different types of antennas, with a pre-defined gap (e.g., 1.5mm) between each segment (the gaps are filled with nano-injection molded plastic). The first metal frame segment (27-30mm in length) located at the top center is set as the NTN satellite antenna 500, with a frequency range of 1525-2200 MHz. This effectively places the NTN satellite antenna 500 at the top of the mobile terminal, avoiding the presence of speakers, loudspeakers, and other electronic components, allowing the NTN satellite antenna 500 to achieve optimal performance.

[0021] The second, rounded metal frame section (15-18mm in length) located in the upper left corner is designated as the parasitic antenna 600. This parasitic antenna 600 is a 2.4G WiFi / BT GPS L1 antenna, supporting WiFi and Bluetooth (BT) communication in the 2.4 GHz band, and also receiving satellite signals in the GPS L1 band (1575 MHz). It also supports 5G WiFi (the 5G communication standard) communication and WiFi 6E (an extension of the WiFi 6 standard that adds support for the 6 GHz band) communication in the 4900-5000 MHz operating frequency band.

[0022] It should be understood that this embodiment mainly uses a portion of the metal edge to fabricate the NTN satellite antenna 500, thereby adapting and adjusting the distribution and length of each antenna in the existing communication antenna group 400. The specific connection relationship between the communication antenna group 400, the parasitic antenna 600, the processor 100, and the RF transceiver circuit 200 remains unchanged from the prior art. The specific circuit structure of the processor 100 and the RF transceiver circuit 200 also remains unchanged from the prior art; the improvement is the addition of a selection switch circuit 300 connected to the processor 100 and the RF transceiver circuit 200. Since there is a gap between the NTN satellite antenna 500 and the parasitic antenna 600, their combination is achieved using capacitive coupling.

[0023] The antennas in the communication antenna group 400 are respectively (with...) Figure 2 The directions shown are used to describe left and right (adjustments may be made during implementation). The third segment of the metal frame with an arc shape located in the upper right corner (the length ranges from 46 to 55 mm) is set as the diversity antenna 301. The diversity antenna 301 supports the following operating frequency ranges: 2G low frequency 600~960 MHz, 3G mid frequency 1710~2170 MHz, and 4G high frequency 2300~2700 MHz.

[0024] The fourth metal frame segment on the right (with a length ranging from 125 to 130 mm) is designated as the first 5G antenna 302. The first 5G antenna 302 supports the following operating frequency bands: 1710~2170 MHz (belonging to the 4G / 5G shared frequency band), 2496~2690 MHz (corresponding to the n41 frequency band), 3.3~4.2 GHz (corresponding to the n77 or n78 frequency band), and 4.4~5 GHz (corresponding to the n79 frequency band).

[0025] The fifth segment of the metal frame with an arc shape (length ranging from 10 to 15 mm) located in the lower right corner is set as the second 5G antenna 303. The second 5G antenna 303 supports operating frequency bands including 2.5~2.7 GHz, 3.3~4.2 GHz, and 4.4~5 GHz.

[0026] The sixth metal frame segment (52-60mm in length) located in the middle of the bottom is set as the main antenna 304. The main antenna 304 supports the following operating frequency ranges: 2G low frequency 600-960 MHz, 3G mid frequency 1710-2170 MHz, and 4G high frequency 2300-2700 MHz.

[0027] The seventh segment of the metal frame with an arc shape located in the lower left corner (the length ranges from 15 to 20 mm) is set as the third 5G antenna 305. The third 5G antenna 305 supports the following operating frequency bands: 2.5~2.7 GHz, 3.3~4.2 GHz, and 4.4~5 GHz.

[0028] The eighth metal frame segment on the left (with a length ranging from 125 to 130 mm) is configured as the fourth 5G antenna 306. The fourth 5G antenna 306 supports operating frequency bands including 1710~2170 MHz, 2.5~2.7 GHz, 3.3~4.2 GHz, and 4.4~5 GHz.

[0029] The antennas described above represent the antenna distribution implemented by NTN-NR using the 5G NR framework. Figure 2 In the diagram, the black blocks connected to the inner frame on each antenna represent ground feed points, while those not connected to the inner frame are main feed points. When the NTN satellite antenna 500 and parasitic antenna 600 are combined for satellite communication, the NTN frequency band is shown in Table 1 below, where 3GPP IOT represents the protocol standard, DL represents downlink, and HL represents uplink.

[0030] Table 1 like Figure 3 As shown, the selection switch circuit 300 includes a first switch U1, a second switch U2, a coaxial interface J1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; the VDD pin of the first switch U1 and the VDD pin of the second switch U2 are connected to the power supply voltage VFEN_MT6825 (provided by the processor); the CTRL pins of the first switch U1 and the second switch U2 are both connected to the processor's control pin (providing the switching signal BPI1); the GND pins of the first switch U1 and the second switch U2 are both grounded; the RF1 pin of the first switch U1 is connected to one end of the first capacitor C1 and one end of the second capacitor C2; the first The other end of capacitor C1 is connected to the RF2 pin of the first switch U1, one end of the third capacitor C3, and the first main feed point F1 of the NTN satellite antenna; the other ends of the second capacitor C2 and the third capacitor C3 are both grounded; the RF1 pin of the second switch U2 is connected to one end of the fourth capacitor C4, one end of the fifth capacitor C5, and the second main feed point F2 of the NTN satellite antenna; the RF2 pin of the second switch U2 is connected to the other end of the fourth capacitor C4, one end of the sixth capacitor C6, and the OUT pin of the coaxial interface J1; the other ends of the fifth capacitor C5 and the sixth capacitor C6 are both grounded; the IN pin of the coaxial interface J1 is connected to the signal transmission pin of the RF chip in the RF transceiver circuit 200; and the GND pin of the coaxial interface J1 is grounded.

[0031] The first switch U1 and the second switch U2 are preferably SKY19250-001 RF switches. The processor outputs a power supply voltage VFEN_MT6825 to power the two switches and outputs a switching signal BPI1 to control the synchronous switching of the two switches. When the switching signal BPI1 is valid (e.g., high level is valid), the RF1 pins of the two switches are connected to the RF2 pins. The signal path in the first switch U1 is as follows: first main feed point F1 of the NTN satellite antenna → third capacitor C3 → RF2 pin → RF1 pin → second capacitor C2 → ground. The signal path in the second switch U2 is as follows: second main feed point F2 of the NTN satellite antenna → fifth capacitor C5 → RF1 pin → RF2 pin → sixth capacitor C6 → coaxial interface J1. Antenna data is transmitted between the antenna signal ANT_MT 6825 and the RF transceiver circuit 200. Combined with the parasitic antenna 600, satellite communication is performed. After the RF1 pins and RF2 pins are connected, the operating frequency bands of the NTN satellite antenna are the B24 and B255 bands in Table 1 above.

[0032] When the switching signal BPI1 is invalid (e.g., low level invalid), the RF1 and RF2 pins of both switches are disconnected. The signal path in the first switch U1 is sequentially: NTN satellite antenna's first main feed point F1 → third capacitor C3 → first capacitor C1 → second capacitor C2 → ground. The signal path in the second switch U2 is sequentially: NTN satellite antenna's second main feed point F2 → fifth capacitor C5 → fourth capacitor C4 → sixth capacitor C6 → coaxial interface J1. Although antenna data is transmitted between the antenna signal ANT_MT 6825 and the RF transceiver circuit 200, the connection between RF1 and RF2 is direct, while the signal passes through C1 and C4 after the connection is broken, resulting in different operating frequency bands. When RF1 and RF2 are disconnected, the NTN satellite antenna operates in the B23 and B256 frequency bands listed in Table 1. The coaxial interface J1 can also be used as a test point; during testing, signals are directly output to test whether the NTN satellite antenna is functioning correctly.

[0033] Preferably, the selection switch circuit 300 further includes a first resistor R1, which is connected between the RF2 pin of the second switch U2 and the OUT pin of the coaxial interface J1 for current limiting protection of the coaxial interface J1.

[0034] In practical implementation, an SPST switch can be added to switch between different frequency bands of the NTN satellite antenna, meeting the product's frequency band expansion needs. The NTN satellite antenna 500 can also be placed in other locations on the mobile terminal; for example, a section of the upper metal frame on the left or right side can be used as the NTN satellite antenna. The NTN satellite antenna can also be combined with a GPS antenna, making antenna layout design easier and saving more space on the mobile terminal.

[0035] In summary, the mobile terminal based on NTN satellite antenna frequency band adjustment provided by this utility model utilizes a metal frame to form the NTN satellite antenna, parasitic antenna, and various types of communication antennas, which are directly integrated with the mobile terminal's casing without increasing the thickness or space of the device, thus meeting the miniaturization requirements of the mobile terminal. The operating frequency band of the NTN satellite antenna is changed by selecting and switching the current operating frequency band control circuit. When combined with the parasitic antenna, it operates in a suitable frequency band, improving the antenna's radiation performance.

[0036] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A mobile terminal based on NTN satellite antenna frequency band adjustment, comprising a housing and a circuit board disposed within the housing, wherein the circuit board integrates a processor and radio frequency transceiver circuitry, characterized in that, The circuit board also integrates a selection switch circuit, and the metal frame of the fuselage is broken into several segments to form a communication antenna group, an NTN satellite antenna, and a parasitic antenna. Both the communication antenna group and the parasitic antenna are connected to the radio frequency transceiver circuit; The processor is connected to the radio frequency transceiver circuit and the selection switch circuit. The selection switch circuit is connected to the processor, the radio frequency transceiver circuit and the NTN satellite antenna. The processor controls the switching state of the selection switch circuit according to the current operating frequency band, and switches the NTN satellite antenna to the corresponding frequency band and combines it with the parasitic antenna to perform satellite communication.

2. The mobile terminal based on NTN satellite antenna frequency band adjustment according to claim 1, characterized in that, The metal frame is divided into 8 segments, with a preset distance between each segment.

3. The mobile terminal based on NTN satellite antenna frequency band adjustment according to claim 2, characterized in that, The first metal frame at the top center is set as the NTN satellite antenna; the second metal frame with an arc at the top left corner is set as the parasitic antenna; the third metal frame with an arc at the top right corner is set as the diversity antenna; the fourth metal frame on the right is set as the first 5G antenna; the fifth metal frame with an arc at the bottom right corner is set as the second 5G antenna; the sixth metal frame at the bottom center is set as the main antenna; the seventh metal frame with an arc at the bottom left corner is set as the third 5G antenna; and the eighth metal frame on the left is set as the fourth 5G antenna.

4. The mobile terminal based on NTN satellite antenna frequency band adjustment according to claim 3, characterized in that, The selection switch circuit includes a first switch, a second switch, a coaxial interface, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; The VDD pin of the first switch and the VDD pin of the second switch are connected to the power supply voltage. The CTRL pins of the first switch and the second switch are both connected to the control pins of the processor. The GND pins of the first switch and the second switch are both grounded. The RF1 pin of the first switch is connected to one end of the first capacitor and one end of the second capacitor. The other end of the first capacitor is connected to the RF2 pin of the first switch, one end of the third capacitor, and the first main feed point of the NTN satellite antenna. The other ends of the second capacitor and the other ends of the third capacitor are both grounded. The RF1 pin of the second switch is connected to one end of the fourth capacitor, one end of the fifth capacitor, and the second main feed point of the NTN satellite antenna. The RF2 pin of the second switch is connected to the other end of the fourth capacitor, one end of the sixth capacitor, and the OUT pin of the coaxial interface. The other ends of the fifth capacitor and the sixth capacitor are both grounded. The IN pin of the coaxial interface is connected to the RF transceiver circuit, and the GND pin of the coaxial interface is grounded.

5. The mobile terminal based on NTN satellite antenna frequency band adjustment according to claim 4, characterized in that, The selection switch circuit also includes a first resistor, which is connected between the RF2 pin of the second switch and the OUT pin of the coaxial interface.

6. The mobile terminal based on NTN satellite antenna frequency band adjustment according to claim 3, characterized in that, The length of the first metal frame segment ranges from 27 to 30 mm.

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