External dual-band antenna switching system, method and controller

Abstract

The present invention relates to the field of antenna technology, and provides an external dual-band antenna switching system, method, and controller. The system comprises: a terminal control system and an external antenna, wherein the terminal control system is connected to the external antenna via a radio frequency transmission line; the terminal control system comprises a controller, a radio frequency wireless transceiver, and a power chip, wherein the controller is configured to determine a power control signal based on the corresponding transceiver status of the radio frequency wireless transceiver, and the power chip is configured to determine a power supply control signal based on the power supply control signal; the external antenna comprises an antenna body and an antenna switch, wherein the antenna switch is configured to receive a power supply control signal via the radio frequency transmission line, the power supply control signal being used to control the on / off state of the antenna switch, and the on / off state of the antenna switch being used to adjust a matching network of the antenna body to switch the operating frequency band of the antenna body. The present invention does not require increasing the size of the antenna, and can achieve dual-band operation of the antenna body while ensuring that the external antenna is small and operates in a low frequency band.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an external dual-frequency antenna switching system, method and controller. Background Art

[0002] In wireless communication terminals, some terminal systems use external antennas for communication. For terminal systems with lower communication frequency bands such as U / V band, in order to ensure antenna performance, the size of the external antenna is required to be relatively large. For example, Figure 1 It is a schematic diagram of an external antenna provided by the prior art, such as Figure 1 As shown, the external antenna has a height of approximately 9 cm and typically houses a helical antenna. Therefore, when small and operating at low frequencies, the external antenna typically only supports one frequency band. Currently, when transmitting and receiving at different frequencies, existing external antennas cannot achieve dual-band operation. This requires a significant increase in antenna size to achieve dual-band operation, impacting the communication performance of wireless communication terminals. Summary of the Invention

[0003] The present invention provides an external dual-band antenna switching system, method and controller to solve the defect in the prior art that the external antenna is small in size and cannot achieve dual-band operation when operating in a low frequency band, thereby affecting the communication performance of the wireless communication terminal.

[0004] The present invention provides an external dual-frequency antenna switching system, comprising: a terminal control system and an external antenna, wherein the terminal control system is connected to the external antenna based on a radio frequency transmission line;

[0005] The terminal control system includes a controller, a radio frequency wireless transceiver, and a power chip. The controller is used to determine a power control signal based on the corresponding transceiver status of the radio frequency wireless transceiver; the power chip is used to determine a power supply control signal based on the power control signal; the power supply control signal is used to indicate whether the power chip is outputting power;

[0006] The external antenna includes an antenna body and an antenna switch. The antenna switch is used to receive the power supply control signal based on the radio frequency transmission line. The power supply control signal is used to control the on-off state of the antenna switch. The on-off state of the antenna switch is used to adjust the matching network of the antenna body to switch the working frequency band of the antenna body.

[0007] According to the external dual-band antenna switching system provided by the present invention, the terminal control system includes a first switch and a first capacitor, the first switch connects the controller, the RF wireless transceiver and the first end of the first capacitor, and the second end of the first capacitor is connected to the external antenna based on the RF transmission line;

[0008] The controller is further configured to supply power to the first switch and generate a switch control signal corresponding to the transceiver state of the RF transceiver, wherein the switch control signal is configured to switch a target connection path between the first switch and the RF transceiver.

[0009] According to the external dual-band antenna switching system provided by the present invention, the terminal control system also includes a first inductor and a second capacitor, the first end of the first inductor is connected to the second end of the first capacitor, the second end of the first inductor is connected to the output end of the power supply chip and the first end of the second capacitor, and the second end of the second capacitor is grounded.

[0010] According to the external dual-band antenna switching system provided by the present invention, the external antenna further includes a second inductor and a matching component, wherein:

[0011] A first end of the second inductor is connected to the RF transmission line and the matching component, and a second end of the second inductor is connected to a power supply terminal and a control terminal of the antenna switch;

[0012] The matching component is also connected to the antenna switch and the antenna body; the on-off state of the antenna switch is used to adjust the corresponding connection state of the matching component to adjust the matching network of the antenna body.

[0013] According to the external dual-band antenna switching system provided by the present invention, the matching component includes a third capacitor, a matching device and a matching circuit, wherein:

[0014] A first end of the third capacitor is connected to the RF transmission line and the first end of the second inductor, and a second end of the third capacitor is connected to the first end of the matching device;

[0015] The matching circuit is also connected to the antenna body and the antenna switch;

[0016] The second end of the matching device is connected to the matching circuit and the antenna switch, or connected to the antenna body.

[0017] According to the external dual-band antenna switching system provided by the present invention, when the second end of the matching device is connected to the matching circuit and the antenna switch, the matching circuit includes a first series matching network and a second series matching network, wherein:

[0018] A first end of the first series matching network is connected to the second end of the matching device and the first end of the antenna switch, a second end of the first series matching network is connected to the antenna body and the first end of the second series matching network, and a second end of the second series matching network is connected to the second end of the antenna switch;

[0019] The on-off state of the antenna switch is used to control whether the second series matching network is connected to the matching circuit to adjust the matching network of the antenna body.

[0020] According to the external dual-band antenna switching system provided by the present invention, when the second end of the matching device is connected to the antenna body, the matching circuit includes a first parallel matching network and a second parallel matching network, wherein:

[0021] A first end of the first parallel matching network is connected to the antenna body and the first end of the antenna switch, a second end of the first parallel matching network is connected to the first end of the second parallel matching network, the ground end of the antenna switch, and the ground end of the RF transmission line, and a second end of the second parallel matching network is connected to the second end of the antenna switch;

[0022] The on-off state of the antenna switch is used to control whether the second parallel matching network is connected to the matching circuit to adjust the matching network of the antenna body.

[0023] According to the external dual-band antenna switching system provided by the present invention, when the second end of the matching device is connected to the antenna body, the matching circuit includes a third parallel matching network, a first end of the third parallel matching network is connected to the antenna body, and a second end of the third parallel matching network is connected to the first end of the antenna switch; the on-off state of the antenna switch is used to control whether the third parallel matching network is connected to the matching component to adjust the matching network of the antenna body.

[0024] The present invention also provides an external dual-band antenna switching method, which is applied to the external dual-band antenna switching system as described in any one of the above items. The method includes the following steps.

[0025] Based on the corresponding transceiver status of the radio frequency wireless transceiver, a power control signal is determined; the power control signal is used to control the power chip to determine the power supply control signal, and the power supply control signal is used to indicate whether the power supply chip outputs power; the power supply control signal is used to control the on-off state of the antenna switch, and the on-off state of the antenna switch is used to adjust the matching network of the antenna body to switch the working frequency band of the antenna body.

[0026] The present invention also provides a controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, any one of the above-described external dual-band antenna switching methods is implemented.

[0027] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the external dual-band antenna switching method described in any one of the above methods is implemented.

[0028] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements any of the above-mentioned external dual-band antenna switching methods.

[0029] The external dual-band antenna switching system, method, and controller provided by the present invention determine a corresponding power control signal based on the transceiver status of a radio frequency wireless transceiver through the controller. The power chip determines a power control signal indicating whether the power chip is outputting power based on the power control signal, and transmits the power control signal to the antenna switch via a radio frequency transmission line. The power control signal controls whether the antenna switch is powered based on the power control signal to control the on / off state of the antenna switch. The matching network of the antenna body is adjusted based on the on / off state of the antenna switch, thereby switching the operating frequency band of the antenna body. In the present invention, the power control signal corresponding to the antenna switch is transmitted via the radio frequency transmission line, that is, the radio frequency transmission line is reused as a power supply line, thereby switching the operating frequency band of the antenna body based on the transceiver status of the radio frequency wireless transceiver. This eliminates the need to increase the size of the antenna. While ensuring that the external antenna is small in size and operates in the low frequency band, the antenna body can meet the dual-band operation requirements, thereby ensuring the communication performance of the wireless communication terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a schematic diagram of an external antenna provided by the prior art.

[0032] Figure 2 It is a structural diagram of an external dual-band antenna switching system provided by an embodiment of the present invention.

[0033] Figure 3 This is one of the structural diagrams of the external antenna provided in an embodiment of the present invention.

[0034] Figure 4 This is the second structural diagram of the external antenna provided by an embodiment of the present invention.

[0035] Figure 5 It is a schematic diagram of the structure of a terminal control system provided by an embodiment of the present invention.

[0036] Figure 6 This is the third structural diagram of the external antenna provided by an embodiment of the present invention.

[0037] Figure 7This is the fourth structural diagram of the external antenna provided by an embodiment of the present invention.

[0038] Figure 8 This is the fifth structural diagram of the external antenna provided by an embodiment of the present invention.

[0039] Figure 9 This is the sixth structural diagram of the external antenna provided by an embodiment of the present invention.

[0040] Figure 10 It is a structural diagram of an external antenna provided by the prior art.

[0041] Figure 11 It is a schematic diagram of the antenna reflection coefficient of the external antenna provided by the prior art.

[0042] Figure 12 It is a structural diagram of an external antenna provided by an embodiment of the present invention.

[0043] Figure 13 Schematic diagram of the antenna reflection coefficient of the external antenna provided in an embodiment of the present invention.

[0044] Figure 14 It is a flow chart of the external dual-band antenna switching method provided by an embodiment of the present invention.

[0045] Figure 15 It is a schematic structural diagram of a controller provided by an embodiment of the present invention.

[0046] Reference numerals:

[0047] 100. Terminal control system; 110. Controller; 120. RF wireless transceiver; 130. Power chip; 140. First switch; 150. First capacitor; 160. First inductor; 170. Second capacitor; 200. External antenna; 210. Antenna body; 220. Antenna switch; 230. Second inductor; 240. Matching component; 241. Third capacitor; 242. Matching device; 243. Matching circuit; 244. First series matching network; 245. Second series matching network; 246. First parallel matching network; 247. Second parallel matching network; 248. Third parallel matching network; 250. Antenna base; 260. Antenna board; 300. RF transmission line. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0049] In view of the problem in the prior art that the external antenna 200 is small in size and cannot achieve dual-band operation in the low frequency band, which affects the communication performance of the wireless communication terminal, the embodiment of the present invention provides an external dual-band antenna switching system. Figure 2 FIG is a structural diagram of an external dual-band antenna switching system provided by an embodiment of the present invention. Figure 2 As shown, the external dual-band antenna switching system includes a terminal control system 100 and an external antenna 200 , and the terminal control system 100 is connected to the external antenna 200 based on a radio frequency transmission line 300 .

[0050] The terminal control system 100 includes a controller 110, a radio frequency wireless transceiver 120 and a power chip 130. The controller 110 is used to determine a power control signal based on the corresponding transceiver status of the radio frequency wireless transceiver 120; the power chip 130 is used to determine a power supply control signal based on the power control signal; the power supply control signal is used to indicate whether the power supply chip 130 is outputting power.

[0051] The external antenna 200 includes an antenna body 210 and an antenna switch 220. The antenna switch 220 is used to receive the power supply control signal based on the RF transmission line 300. The power supply control signal is used to control the on-off state of the antenna switch 220. The on-off state of the antenna switch 220 is used to adjust the matching network of the antenna body 210 to switch the working frequency band of the antenna body 210.

[0052] Specifically, the terminal control system 100 includes a controller 110, a radio frequency (RF) transceiver 120, and a power chip 130, with the controller 110 being connected to the RF transceiver 120 and the power chip 130, respectively. The RF transceiver 120 is configured to work in conjunction with the antenna body 210 in the external antenna 200, namely, to modulate, demodulate, and frequency convert signals to ensure efficient signal transmission and reception. The controller 110 can generate a corresponding power control signal based on the transceiver's 120 transceiver state. The different power control signal levels correspond to the transceiver's 120 transceiver state. For example, a high power control signal corresponds to the RF transceiver 120's transmitting state, while a low power control signal corresponds to the RF transceiver's receiving state. After generating the power control signal, the controller 110 transmits the power control signal to the power chip 130, which then generates a power supply control signal in response to the power control signal. The external antenna 200 includes an antenna body 210 and an antenna switch 220, which is an active antenna switch 220. The different levels of the power control signal indicate whether the power chip 130 is supplying power to the antenna switch 220 in the external antenna 200. For example, when the power control signal is high, it indicates that the power chip 130 is supplying power to the antenna switch 220, corresponding to the transmitting state of the RF transceiver 120. When the power control signal is low, it indicates that the power chip 130 is not supplying power to the antenna switch 220, corresponding to the receiving state of the RF transceiver 120.

[0053] After generating a power control signal, the power chip 130 transmits the power control signal to the antenna switch 220 via the RF transmission line 300. The power supply terminal VCC and the control terminal CTL of the antenna switch 220 are connected in parallel. The power supply terminal VCC and the control terminal CTL of the antenna switch 220 are controlled by the level of the power control signal to simultaneously supply power to the antenna switch 220, thereby controlling the on / off state of the antenna switch 220. For example, when the power control signal is high, the power supply terminal VCC and the control terminal CTL of the antenna switch 220 are simultaneously powered, turning the antenna switch 220 on. This adjusts the matching network corresponding to the antenna body 210, thereby switching the operating frequency band of the antenna body 210 to the transmit frequency band. When the power control signal is low, the power supply terminal VCC and the control terminal CTL of the antenna switch 220 are not powered, turning the antenna switch 220 open, adjusting the matching network corresponding to the antenna body 210, thereby switching the operating frequency band of the antenna body 210 to the receive frequency band.

[0054] It should be noted that Figure 3 FIG. 1 is a schematic diagram of a structure of an external antenna provided by an embodiment of the present invention. Figure 3As shown, the external antenna 200 includes an antenna body 210, an antenna base 250 and an antenna plate 260, wherein the first end of the RF transmission line 300 is connected to the central feed core point of the antenna base 250, and the central feed core point of the antenna base 250 is welded to the feeding point of the antenna plate 260, thereby realizing the connection between the RF transmission line 300 and the antenna plate 260. Figure 4 This is a second structural diagram of an external antenna provided by an embodiment of the present invention. Figure 4 As shown, the metal ground of the RF transmission line 300's housing is connected to the ground of the antenna base 250's housing. The outer ring reference ground of the antenna board 260 is welded to the ground of the antenna base 250's housing. Furthermore, the GND terminal of the antenna switch 220 is connected to the outer ring reference ground of the antenna board 260, thereby achieving a common ground connection between the RF transmission line 300's housing ground, the antenna base 250's housing ground, the outer ring reference ground of the antenna board 260, and the GND terminal of the antenna switch 220. Furthermore, the antenna body 210 is a single antenna, and the shape of the antenna body 210 can be spiral or other shapes. For example, the spiral shape of the antenna body 210 is welded to the spiral antenna welding point on the antenna board 260.

[0055] In addition, the second end of the RF transmission line 300 is connected to the communication port of the terminal control system 100 , and the metal ground of the shell of the RF transmission line 300 is connected to the common ground of the terminal control system 100 .

[0056] In an embodiment of the present invention, a power supply control signal for determining whether to power the antenna switch 220 is transmitted via the RF transmission line 300, i.e., the RF transmission line 300 is reused as a power supply line to control the on / off state of the antenna switch 220 according to the transceiver state of the RF wireless transceiver 120, thereby switching the operating frequency band of the antenna body 210. When the external antenna 200 is small in size and operates in a low frequency band, the antenna body 210 can operate in dual bands, thereby ensuring the communication performance of the wireless communication terminal.

[0057] Further, Figure 5 is a schematic diagram of the structure of the terminal control system provided by an embodiment of the present invention, such as Figure 5 As shown, the terminal control system 100 includes a first switch 140 and a first capacitor 150, the first switch 140 connects the controller 110, the RF wireless transceiver 120 and a first end of the first capacitor 150, and the second end of the first capacitor 150 is connected to the external antenna 200 based on the RF transmission line 300;

[0058] The controller 110 is further configured to supply power to the first switch 140 and generate a switch control signal corresponding to the transceiver state of the RF transceiver 120 . The switch control signal is configured to switch a target connection path between the first switch 140 and the RF transceiver 120 .

[0059] Specifically, in the terminal control system 100, the first switch 140 is a single-pole, double-throw (SPDT) switch. The input port of the first switch 140 is connected in series with a first capacitor 150, which is connected to the second end of the RF transmission line 300. The first capacitor 150 is used to isolate DC signals and conduct high-frequency signals. The two output ports of the first switch 140 are connected to the transmit and receive ports of the RF transceiver 120, respectively. The power supply terminal VCC and the control terminal CTL of the first switch 140 are both connected to the controller 110. After the controller 110 supplies power to the first switch 140 via the power supply terminal VCC, it generates a corresponding switch control signal based on the transceiver 120's transceiver status. Depending on the level of the switch control signal, the desired connection path between the first switch 140 and the RF transceiver 120 can be switched. For example, when the switch control signal is high, the first switch 140 can be controlled to conduct the desired connection path between the transmit port and the corresponding output port of the RF transceiver 120. When the switch control signal is a low level signal, the first switch 140 can be controlled to conduct a target connection path between the receiving port and the corresponding output port of the RF wireless transceiver 120 .

[0060] Furthermore, if Figure 5 As shown, the terminal control system 100 also includes a first inductor 160 and a second capacitor 170, the first end of the first inductor 160 is connected to the second end of the first capacitor 150, the second end of the first inductor 160 is connected to the output end of the power chip 130 and the first end of the second capacitor 170, and the second end of the second capacitor 170 is grounded.

[0061] Specifically, the second end of the RF transmission line 300 is also connected to the first inductor 160 and the second capacitor 170 in the terminal control system 100, and the first inductor 160 and the second capacitor 170 are connected in series. The series connection point of the first inductor 160 and the second capacitor 170 is also connected to the output end of the power supply chip 130, so that the power supply chip 130 can control whether to supply power to the antenna switch 220 through the RF transmission line 300 according to the level of the power control signal, that is, to control the on / off state of the antenna switch 220. In this process, the first inductor 160 is used to isolate high-frequency signals and prevent the power supply line from affecting RF transmission. The second capacitor 170 is in a short-circuit grounded state at high frequencies, which can further eliminate the impact of the back-end power supply line on RF transmission. At the same time, the second capacitor 170 is a large grounded capacitor that is open-circuited in DC, does not affect the normal operation of the power supply line, and realizes the common ground connection between the shell ground of the RF transmission line 300 and the ground end of the terminal control system 100.

[0062] Further, Figure 6 This is a third structural diagram of an external antenna provided by an embodiment of the present invention, such as Figure 6As shown, the external antenna 200 further includes a second inductor 230 and a matching component 240, wherein:

[0063] A first end of the second inductor 230 is connected to the RF transmission line 300 and the matching component 240 , and a second end of the second inductor 230 is connected to the power supply terminal VCC and the control terminal CTL of the antenna switch 220 ;

[0064] The matching component 240 is further connected to the antenna switch 220 and the antenna body 210 ; the on-off state of the antenna switch 220 is used to adjust the corresponding connection state of the matching component 240 to adjust the matching network of the antenna body 210 .

[0065] Specifically, in the external antenna 200, the second inductor 230 is connected to the first end of the RF transmission line 300 and is used to isolate high-frequency signals. The matching component 240 serves as the matching network for the antenna body 210. Different connection states of the matching component 240 indicate different matching networks for the antenna body 210, and thus different operating frequency bands for the antenna body 210. Therefore, by adjusting the connection state of the matching component 240, the operating frequency band of the antenna body 210 can be switched, thereby achieving dual-band operation for the antenna body 210.

[0066] Furthermore, the matching component 240 includes a third capacitor 241, a matching device 242 and a matching circuit 243, wherein:

[0067] A first end of the third capacitor 241 is connected to the RF transmission line 300 and the first end of the second inductor 230 , and a second end of the third capacitor 241 is connected to the first end of the matching device 242 ;

[0068] The matching circuit 243 is also connected to the antenna body 210 and the antenna switch 220;

[0069] A second end of the matching device 242 is connected to the matching circuit 243 and the antenna switch 220 , or is connected to the antenna body 210 .

[0070] Specifically, the second end of the RF transmission line 300 is also connected to a third capacitor 241, which isolates DC signals and conducts high-frequency signals. This third capacitor 241 is connected in series with a matching device 242, which is a matching network with a fixed impedance. The matching circuit 243 is a matching network whose connection relationship dynamically changes with the on / off state of the antenna switch 220. The combination of the matching device 242 and the matching circuit 243 allows for dynamic adjustment of the matching network of the antenna body 210, thereby adjusting the operating frequency band of the antenna body 210. In this embodiment of the present invention, the matching circuit 243 is fixedly connected to the antenna body 210 and the antenna switch 220, while the connection relationship of the matching device 242 changes with the dynamic changes of the matching circuit 243. In this embodiment of the present invention, three specific structures of the matching circuit 243 are provided. Accordingly, in the first embodiment, the matching device 242 can be connected to the matching circuit 243 and the antenna switch 220. In the second and third embodiments, the matching device 242 can be directly connected to the antenna body 210.

[0071] Furthermore, in the first case, when the second end of the matching device 242 is connected to the matching circuit 243 and the antenna switch 220, the matching circuit 243 includes a first series matching network 244 and a second series matching network 245, wherein:

[0072] A first end of the first series matching network 244 is connected to the second end of the matching device 242 and the first end of the antenna switch 220, a second end of the first series matching network 244 is connected to the antenna body 210 and the first end of the second series matching network 245, and a second end of the second series matching network 245 is connected to the second end of the antenna switch 220;

[0073] The on / off state of the antenna switch 220 is used to control whether the second series matching network 245 is connected to the matching circuit 243 , so as to adjust the matching network of the antenna body 210 .

[0074] For example, Figure 7 This is a fourth structural diagram of an external antenna provided by an embodiment of the present invention, such as Figure 7As shown, when the power supply control signal is a low-level signal, the power supply terminal VCC and the control terminal CTL of the antenna switch 220 are not powered, so that the antenna switch 220 is in an open-circuit state. The second series matching network 245 is not connected because the antenna switch 220 is open. At this time, only the first series matching network 244 and the matching device 242 are connected in series. The antenna body 210 is equivalent to being connected in series with the first matching network composed of the first series matching network 244 and the matching device 242. The first matching network can enable the antenna body 210 to operate in the receiving frequency band. When the power supply control signal is a high-level signal, the power supply terminal VCC and the control terminal CTL of the antenna switch 220 are simultaneously powered, so that the antenna switch 220 is in a conductive state. At this time, the second series matching network 245 is connected in parallel with the first series matching network 244 to form a first parallel equivalent circuit. The first parallel equivalent circuit is in a short-circuit conductive state. At this time, the antenna body 210 is equivalent to a second matching network formed by the first parallel equivalent circuit and the matching device 242 in series. The second matching network can enable the antenna body 210 to operate in the transmission frequency band.

[0075] It should be noted that the impedances of the first series matching network 244 and the second series matching network 245 may be the same or different, and this is not limited in this embodiment of the present invention. In addition, the impedance of the matching device 242 is different from the impedance of either the first series matching network 244 or the second series matching network 245.

[0076] It should be noted that, in the embodiment of the present invention, there is no limitation on the working frequency bands corresponding to the first matching network and the second matching network, as long as the working frequency bands corresponding to the first matching network and the second matching network are different. For example, when the working frequency band corresponding to the first matching network is the receiving frequency band, the working frequency band corresponding to the second matching network is the transmitting frequency band; when the working frequency band corresponding to the first matching network is the transmitting frequency band, the working frequency band corresponding to the second matching network is the receiving frequency band.

[0077] In the second case, when the second end of the matching device 242 is connected to the antenna body 210, the matching circuit 243 includes a first parallel matching network 246 and a second parallel matching network 247, wherein:

[0078] A first end of the first parallel matching network 246 is connected to the antenna body 210 and a first end of the antenna switch 220. A second end of the first parallel matching network 246 is connected to a first end of the second parallel matching network 247, a ground end of the antenna switch 220, and a ground end of the RF transmission line 300. A second end of the second parallel matching network 247 is connected to a second end of the antenna switch 220.

[0079] The on / off state of the antenna switch 220 is used to control whether the second parallel matching network 247 is connected to the matching circuit 243 to adjust the matching network of the antenna body 210 .

[0080] For example, Figure 8 This is a fifth structural diagram of an external antenna provided by an embodiment of the present invention, such as Figure 8 As shown, when the power control signal is low, the power supply terminal VCC and control terminal CTL of antenna switch 220 are not powered, rendering antenna switch 220 in an open state. Due to the open circuit of antenna switch 220, second parallel matching network 247 is not connected. At this time, only first parallel matching network 246 is connected in parallel with matching device 242. Antenna body 210 is equivalent to having a third matching network formed by the first parallel matching network 246 and matching device 242 connected in parallel. This third matching network enables antenna body 210 to operate in the receive frequency band. When the power control signal is high, power is simultaneously supplied to power supply terminal VCC and control terminal CTL of antenna switch 220, rendering antenna switch 220 in an on state. At this time, second parallel matching network 247 is connected in parallel with first parallel matching network 246, forming a second parallel equivalent circuit. At this time, the antenna body 210 is equivalent to being connected in parallel with a fourth matching network formed by the second parallel equivalent circuit and the matching device 242 in parallel. The fourth matching network can enable the antenna body 210 to operate in the transmission frequency band.

[0081] It should be noted that the impedances of the first parallel matching network 246 and the second parallel matching network 247 may be the same or different, and this is not limited in this embodiment of the present invention. In addition, the impedance of the matching device 242 is different from the impedance of either the first parallel matching network 246 or the second parallel matching network 247.

[0082] It should be noted that in the embodiment of the present invention, there is no limitation on the operating frequency bands corresponding to the third matching network and the fourth matching network. It is sufficient to ensure that the operating frequency bands corresponding to the third matching network and the fourth matching network are different. For example, when the operating frequency band corresponding to the third matching network is the receiving frequency band, the operating frequency band corresponding to the fourth matching network is the transmitting frequency band; when the operating frequency band corresponding to the third matching network is the transmitting frequency band, the operating frequency band corresponding to the fourth matching network is the receiving frequency band.

[0083] In the third case, when the second end of the matching device 242 is connected to the antenna body 210, the matching circuit 243 includes a third parallel matching network 248, a first end of the third parallel matching network 248 is connected to the antenna body 210, and a second end of the third parallel matching network 248 is connected to the first end of the antenna switch 220; the on-off state of the antenna switch 220 is used to control whether the third parallel matching network 248 is connected to the matching component 240 to adjust the matching network of the antenna body 210.

[0084] For example, Figure 9 This is a sixth structural diagram of an external antenna provided by an embodiment of the present invention, such as Figure 9 As shown, when the power control signal is low, the power supply terminal VCC and the control terminal CTL of the antenna switch 220 are not powered, causing the antenna switch 220 to be in an open state. Due to the open circuit of the antenna switch 220, the third parallel matching network 248 is not connected. In this case, the antenna body 210 is equivalent to a fifth matching network consisting only of the matching device 242 connected in parallel. This fifth matching network enables the antenna body 210 to operate in the receive frequency band. When the power control signal is high, the power supply terminal VCC and the control terminal CTL of the antenna switch 220 are simultaneously powered, causing the antenna switch 220 to be in a conductive state. At this time, the third parallel matching network 248 is connected in parallel with the matching device 242. In this case, the antenna body 210 is equivalent to a sixth matching network consisting of the third parallel matching network 248 and the matching device 242 connected in parallel. This sixth matching network enables the antenna body 210 to operate in the transmit frequency band.

[0085] It should be noted that the impedance of the third parallel matching network 248 is different from the impedance of the matching device 242 .

[0086] It should be noted that in the embodiment of the present invention, there is no limitation on the working frequency bands corresponding to the fifth matching network and the sixth matching network. It is sufficient to ensure that the working frequency bands corresponding to the fifth matching network and the sixth matching network are different. For example, when the working frequency band corresponding to the fifth matching network is the receiving frequency band, the working frequency band corresponding to the sixth matching network is the transmitting frequency band; when the working frequency band corresponding to the fifth matching network is the transmitting frequency band, the working frequency band corresponding to the sixth matching network is the receiving frequency band.

[0087] In addition, the embodiment of the present invention also uses three-dimensional electromagnetic simulation software to build a model to simulate and evaluate the external dual-frequency antenna switching system provided by the embodiment of the present invention. Taking the antenna body as a helical antenna as an example, Figure 10 This is a schematic diagram of the structure of an external antenna provided by the prior art, such as Figure 10 As shown, in the prior art, the antenna body U1 in the external antenna is only connected in parallel with one matching device L1. Figure 11Schematic diagram of the antenna reflection coefficient of the external antenna provided by the prior art, such as Figure 11 As shown, the software simulation evaluation of the external antenna in the prior art only obtains a curve of the antenna reflection coefficient S(1,1), that is, the external antenna in the prior art only supports a single frequency band of 0.3115 GHz.

[0088] Figure 12 : is a schematic diagram of the structure of an external antenna provided by an embodiment of the present invention, such as Figure 12 As shown, in the first case, taking the second series matching network 245 as a resistor R1, and the resistor R1 being a 0 ohm resistor as an example, when the antenna switch 220 U2 is powered on, the resistor R1 takes effect, and the series matching is equivalent to a short circuit. When the antenna switch 220 U2 is powered off and open, the resistor R1 does not take effect, and the series matching is equivalent to the original series inductance effect. Figure 13 Schematic diagram of the antenna reflection coefficient of the external antenna provided in an embodiment of the present invention, such as Figure 13 As shown, by performing software simulation evaluation on the external antenna 200 provided in the embodiment of the present invention, two curves of the antenna reflection coefficient S(1,1) can be obtained. It can be seen that the external antenna 200 provided in the embodiment of the present invention can simultaneously support operation in the two frequency bands of 0.2655 GHz and 0.3115 GHz.

[0089] An external dual-band antenna switching system provided by an embodiment of the present invention uses a controller to determine a corresponding power control signal based on the transceiver status of a radio frequency wireless transceiver. A power chip determines a power control signal indicating whether the power chip is outputting power based on the power control signal. The power control signal is then transmitted to an antenna switch via an RF transmission line. The power control signal controls whether the antenna switch is powered on or off, thereby controlling the on / off state of the antenna switch. The matching network of the antenna body is adjusted based on the on / off state of the antenna switch, thereby switching the operating frequency band of the antenna body. In this embodiment of the present invention, the power control signal corresponding to the antenna switch is transmitted via an RF transmission line, that is, the RF transmission line is reused as a power line. This enables switching the operating frequency band of the antenna body based on the transceiver status of the radio frequency wireless transceiver without increasing the size of the antenna. This ensures that the external antenna is small in size and that the antenna body can operate in dual bands at low frequencies, thereby guaranteeing the communication performance of the wireless communication terminal.

[0090] An embodiment of the present invention further provides an external dual-band antenna switching method, which is applied to the external dual-band antenna switching system as described in any one of the above items. Figure 14 FIG. 1 is a flow chart of a method for switching an external dual-band antenna provided by an embodiment of the present invention. Figure 14 As shown, the method includes step 1410.

[0091] Step 1410: Determine a power control signal based on the corresponding transceiver status of the RF wireless transceiver; the power control signal is used to control the power chip to determine the power supply control signal, and the power supply control signal is used to indicate whether the power chip outputs power; the power supply control signal is used to control the on-off state of the antenna switch, and the on-off state of the antenna switch is used to adjust the matching network of the antenna body to switch the operating frequency band of the antenna body.

[0092] An embodiment of the present invention provides an external dual-band antenna switching method that determines a corresponding power control signal based on the transceiver status of a radio frequency wireless transceiver. Based on the power control signal, a power supply control signal indicating whether a power chip is outputting power is determined. Based on the power supply control signal, power is supplied to an antenna switch to control the on / off state of the antenna switch. The matching network of the antenna body is adjusted based on the on / off state of the antenna switch, thereby switching the operating frequency band of the antenna body. In this embodiment of the present invention, the operating frequency band of the antenna body can be switched based on the transceiver status of the radio frequency wireless transceiver without increasing the size of the antenna. This ensures that the external antenna is small and that the antenna body can operate in dual bands at low frequencies, thereby guaranteeing the communication performance of the wireless communication terminal.

[0093] Figure 15 Schematic diagram of the structure of the controller provided by the embodiment of the present invention, such as Figure 15 As shown, the controller may include a processor 1510, a communications interface 1520, a memory 1530, and a communications bus 1540, wherein the processor 1510, the communications interface 1520, and the memory 1530 communicate with each other via the communications bus 1540. The processor 1510 may call logic instructions in the memory 1530 to execute a method for switching an external dual-band antenna. The method includes determining a power control signal based on the corresponding transceiver status of the radio frequency wireless transceiver; the power control signal is used to control the power chip to determine a power supply control signal, the power supply control signal is used to indicate whether the power chip is outputting power; the power supply control signal is used to control the on / off state of the antenna switch, and the on / off state of the antenna switch is used to adjust the matching network of the antenna body to switch the operating frequency band of the antenna body.

[0094] In addition, the logic instructions in the aforementioned memory 1530 can be implemented in the form of a software functional unit and, when sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or the portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0095] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the external dual-band antenna switching method provided by the above methods, the method including: determining a power control signal based on the corresponding transceiver status of the radio frequency wireless transceiver; the power control signal is used to control the power supply chip to determine the power supply control signal, and the power supply control signal is used to indicate whether the power supply chip outputs power; the power supply control signal is used to control the on-off state of the antenna switch, and the on-off state of the antenna switch is used to adjust the matching network of the antenna body to switch the working frequency band of the antenna body.

[0096] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the external dual-band antenna switching method provided by the above-mentioned methods, the method including: determining a power control signal based on the corresponding transceiver status of the radio frequency wireless transceiver; the power control signal is used to control the power supply chip to determine the power supply control signal, and the power supply control signal is used to indicate whether the power supply chip outputs power; the power supply control signal is used to control the on-off state of the antenna switch, and the on-off state of the antenna switch is used to adjust the matching network of the antenna body to switch the working frequency band of the antenna body.

[0097] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0098] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An external dual-band antenna switching system, characterized in that: include: A terminal control system and an external antenna, wherein the terminal control system is connected to the external antenna based on a radio frequency transmission line; The terminal control system includes a controller, a radio frequency wireless transceiver and a power chip, wherein the controller is used to determine a power control signal based on the corresponding transceiver status of the radio frequency wireless transceiver; the power chip is used to determine a power supply control signal based on the power control signal; The power supply control signal is used to indicate whether the power chip is outputting power; The external antenna includes an antenna body and an antenna switch. The antenna switch is used to reuse the radio frequency transmission line to receive the power supply control signal. The power supply control signal is used to control the on-off state of the antenna switch. The on-off state of the antenna switch is used to adjust the matching network of the antenna body to switch the working frequency band of the antenna body.

2. The external dual-band antenna switching system according to claim 1, characterized in that: The terminal control system includes a first switch and a first capacitor, the first switch connects the controller, the RF wireless transceiver and a first end of the first capacitor, and the second end of the first capacitor is connected to the external antenna based on the RF transmission line; The controller is further configured to supply power to the first switch and generate a switch control signal corresponding to the transceiver state of the RF transceiver, wherein the switch control signal is configured to switch a target connection path between the first switch and the RF transceiver.

3. The external dual-band antenna switching system according to claim 2, characterized in that: The terminal control system also includes a first inductor and a second capacitor, the first end of the first inductor is connected to the second end of the first capacitor, the second end of the first inductor is connected to the output end of the power chip and the first end of the second capacitor, and the second end of the second capacitor is grounded.

4. The external dual-band antenna switching system according to any one of claims 1 to 3, characterized in that: The external antenna further includes a second inductor and a matching component, wherein: A first end of the second inductor is connected to the RF transmission line and the matching component, and a second end of the second inductor is connected to a power supply terminal and a control terminal of the antenna switch; The matching component is also connected to the antenna switch and the antenna body; the on-off state of the antenna switch is used to adjust the corresponding connection state of the matching component to adjust the matching network of the antenna body.

5. The external dual-band antenna switching system according to claim 4, characterized in that: The matching component includes a third capacitor, a matching device and a matching circuit, wherein: A first end of the third capacitor is connected to the RF transmission line and the first end of the second inductor, and a second end of the third capacitor is connected to the first end of the matching device; The matching circuit is also connected to the antenna body and the antenna switch; The second end of the matching device is connected to the matching circuit and the antenna switch, or connected to the antenna body.

6. The external dual-band antenna switching system according to claim 5, characterized in that: In a case where the second end of the matching device is connected to the matching circuit and the antenna switch, the matching circuit includes a first series matching network and a second series matching network, wherein: A first end of the first series matching network is connected to the second end of the matching device and the first end of the antenna switch, a second end of the first series matching network is connected to the antenna body and the first end of the second series matching network, and a second end of the second series matching network is connected to the second end of the antenna switch; The on-off state of the antenna switch is used to control whether the second series matching network is connected to the matching circuit, so as to adjust the matching network of the antenna body.

7. The external dual-band antenna switching system according to claim 5, characterized in that: In a case where the second end of the matching device is connected to the antenna body, the matching circuit includes a first parallel matching network and a second parallel matching network, wherein: A first end of the first parallel matching network is connected to the antenna body and the first end of the antenna switch, a second end of the first parallel matching network is connected to the first end of the second parallel matching network, the ground end of the antenna switch, and the ground end of the RF transmission line, and a second end of the second parallel matching network is connected to the second end of the antenna switch; The on-off state of the antenna switch is used to control whether the second parallel matching network is connected to the matching circuit to adjust the matching network of the antenna body.

8. The external dual-band antenna switching system according to claim 5, characterized in that: When the second end of the matching device is connected to the antenna body, the matching circuit includes a third parallel matching network, a first end of the third parallel matching network is connected to the antenna body, and a second end of the third parallel matching network is connected to the first end of the antenna switch; the on-off state of the antenna switch is used to control whether the third parallel matching network is connected to the matching component to adjust the matching network of the antenna body.

9. A method for switching an external dual-band antenna, characterized in that: Applied to the external dual-band antenna switching system according to any one of claims 1 to 8, the method comprises: A power control signal is determined based on the corresponding transceiver status of the RF wireless transceiver; the power control signal is used to control the power chip to determine the power supply control signal, and the RF transmission line is multiplexed to transmit the power supply control signal, and the power supply control signal is used to indicate whether the power supply chip outputs power; the power supply control signal is used to control the on-off state of the antenna switch, and the on-off state of the antenna switch is used to adjust the matching network of the antenna body to switch the working frequency band of the antenna body.

10. A controller comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the external dual-band antenna switching method as claimed in claim 9 is implemented.

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