External dual-frequency antenna switching system, method and controller

Abstract

The invention relates to the technical field of antennas, and provides an external dual-frequency antenna switching system, method and controller, the system comprises a terminal control system and an external antenna, and the terminal control system is connected with the external antenna based on a radio frequency transmission line; the terminal control system comprises a controller, a radio frequency wireless transceiver and a power supply chip, the controller is used for determining a power supply control signal based on a transceiving state corresponding to the radio frequency wireless transceiver, and the power supply chip is used for determining a power supply control signal based on the power supply control signal; the external antenna comprises an antenna main body and an antenna switch, the antenna switch is used for receiving a power supply control signal based on the radio frequency transmission line, the power supply control signal is used for controlling the on-off state of the antenna switch, and the on-off state of the antenna switch is used for adjusting a matching network of the antenna main body so as to switch the working frequency band of the antenna main body. According to the invention, the antenna size does not need to be increased, and the dual-band work of the antenna main body can be realized when the size of the external antenna is relatively small and the antenna is 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 is a schematic diagram of an external antenna provided by the prior art, such as Figure 1 As shown in the figure, the height of the external antenna is about 9 cm, and a spiral antenna is generally used inside the external antenna. Therefore, when the external antenna is small in size and in a low frequency band, it generally only supports one frequency band. At present, when the transmission and reception are different frequencies, the existing external antenna cannot achieve dual-band operation. The antenna size needs to be greatly increased to meet the dual-band transmission and reception, which affects the communication performance of the wireless communication terminal. Summary of the invention

[0003] The present invention provides an external dual-frequency antenna switching system, method and controller, which are used to solve the defect in the prior art that the external antenna is small in size and cannot achieve dual-frequency operation in the low frequency band, thus 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; 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 state of the radio frequency wireless transceiver; the power chip is used to determine a power supply control signal based on the power supply control signal; the power supply control signal is used to indicate whether the power supply chip performs power supply output; The external antenna includes an antenna body and an antenna switch, wherein the antenna switch is used to receive the power supply control signal based on the radio frequency transmission line, and 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.

[0005] According to the external dual-frequency 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; The controller is further used to supply power to the first switch and generate a switch control signal corresponding to the transceiver state of the RF wireless transceiver, wherein the switch control signal is used to switch a target connection path between the first switch and the RF wireless transceiver.

[0006] 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 chip and the first end of the second capacitor, and the second end of the second capacitor is grounded.

[0007] According to the external dual-frequency antenna switching system provided by the present invention, 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 end and a control end 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.

[0008] According to the external dual-frequency antenna switching system provided by the present invention, 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.

[0009] According to the external dual-frequency 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: The 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, the 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 the 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 to adjust the matching network of the antenna body.

[0010] According to the external dual-frequency 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: The first end of the first parallel matching network is connected to the antenna body and the first end of the antenna switch, the 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 the 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.

[0011] According to the external dual-frequency 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.

[0012] The present invention also provides an external dual-frequency antenna switching method, which is applied to the external dual-frequency antenna switching system as described in any one of the above items, and the method includes the following steps.

[0013] Based on the receiving and transmitting state corresponding to the RF wireless transceiver, a power control signal is determined; the power control signal is used to control the power chip to determine the power control signal, and the power control signal is used to characterize whether the power chip outputs power; the power 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.

[0014] 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 external dual-frequency antenna switching methods described above is implemented.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the external dual-frequency antenna switching method as described in any one of the above is implemented.

[0016] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the external dual-frequency antenna switching method as described above is implemented.

[0017] The external dual-frequency antenna switching system, method and controller provided by the present invention determine the corresponding power control signal according to the transceiver state of the radio frequency wireless transceiver through the controller, and the power chip determines the power control signal used to characterize whether the power chip performs power output according to the power control signal, and sends the power control signal to the antenna switch through the radio frequency transmission line, and controls whether to power the antenna switch according to the power control signal to control the on-off state of the antenna switch, and adjusts the matching network of the antenna body according to the on-off state of the antenna switch, thereby switching the working frequency band of the antenna body. In the present invention, the power control signal corresponding to the antenna switch is transmitted through the radio frequency transmission line, that is, the radio frequency transmission line is reused as the power supply line, so as to realize the switching of the working frequency band of the antenna body according to the transceiver state of the radio frequency wireless transceiver, without increasing the size of the antenna, and ensuring that the size of the external antenna is small and the dual-band operation of the antenna body is met in the low frequency band, thereby ensuring the communication performance of the wireless communication terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces 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 creative work.

[0019] Figure 1 It is a schematic diagram of an external antenna provided by the prior art.

[0020] Figure 2 It is a structural schematic diagram of an external dual-frequency antenna switching system provided by an embodiment of the present invention.

[0021] Figure 3 This is one of the structural schematic diagrams of the external antenna provided in an embodiment of the present invention.

[0022] Figure 4 This is the second structural schematic diagram of the external antenna provided in the embodiment of the present invention.

[0023] Figure 5 It is a schematic diagram of the structure of a terminal control system provided by an embodiment of the present invention.

[0024] Figure 6 This is the third structural schematic diagram of the external antenna provided in the embodiment of the present invention.

[0025] Figure 7 This is the fourth structural schematic diagram of the external antenna provided in an embodiment of the present invention.

[0026] Figure 8 This is the fifth structural schematic diagram of the external antenna provided in the embodiment of the present invention.

[0027] Fig. 9 This is the sixth structural schematic diagram of the external antenna provided in the embodiment of the present invention.

[0028] Fig.10 It is a structural schematic diagram of an external antenna provided by the prior art.

[0029] Fig.11 It is a schematic diagram of the antenna reflection coefficient of the external antenna provided by the prior art.

[0030] Fig.12 It is a schematic diagram of the structure of an external antenna provided by an embodiment of the present invention.

[0031] Fig.13 It is a schematic diagram of the antenna reflection coefficient of the external antenna provided in an embodiment of the present invention.

[0032] Fig.14 It is a flow chart of an external dual-frequency antenna switching method provided by an embodiment of the present invention.

[0033] Fig.15 It is a schematic diagram of the structure of a controller provided by an embodiment of the present invention.

[0034] Reference numerals: 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

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In view of the problem that the external antenna 200 in the prior art is small in size and cannot achieve dual-band operation in a low frequency band, which affects the communication performance of the wireless communication terminal, an embodiment of the present invention provides an external dual-band antenna switching system. Figure 2is a schematic diagram of the structure of an external dual-frequency antenna switching system provided by an embodiment of the present invention, such as Figure 2 As shown, the external dual-frequency 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 .

[0037] 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 supply control signal; the power supply control signal is used to indicate whether the power supply chip 130 outputs power.

[0038] 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.

[0039] Specifically, the terminal control system 100 includes a controller 110, a radio frequency wireless transceiver 120 and a power chip 130, and the controller 110 is connected to the radio frequency wireless transceiver 120 and the power chip 130 respectively. The radio frequency wireless transceiver 120 is used to work in coordination with the antenna body 210 in the external antenna 200, that is, to modulate, demodulate and frequency convert the signal to ensure the effective transmission and reception of the signal. The controller 110 can generate a corresponding power control signal according to the transceiver state of the radio frequency wireless transceiver 120. The different level states of the power control signal correspond to the transceiver state of the radio frequency wireless transceiver 120. For example, when the power control signal is a high level signal, it corresponds to the transmitting state of the radio frequency wireless transceiver 120, and when the power control signal is a low level signal, it corresponds to the receiving state of the radio frequency wireless transceiver 120. After generating the power control signal, the controller 110 sends the power control signal to the power chip 130, and the power chip 130 can respond to the power control signal and generate a power supply control signal. The external antenna 200 includes an antenna body 210 and an antenna switch 220, and the antenna switch 220 is an active antenna switch 220. The different level states of the power supply control signal indicate whether the power supply chip 130 outputs power to the antenna switch 220 in the external antenna 200. For example, when the power supply control signal is a high level signal, it indicates that the power supply chip 130 outputs power to the antenna switch 220, and corresponds to the transmitting state of the RF wireless transceiver 120. When the power supply control signal is a low level signal, it indicates that the power supply chip 130 does not output power to the antenna switch 220, and corresponds to the receiving state of the RF wireless transceiver 120.

[0040] After generating the power supply control signal, the power supply chip 130 transmits the power supply control signal to the antenna switch 220 through the RF transmission line 300. The power supply terminal VCC and the control terminal CTL in the antenna switch 220 are connected in parallel. The power supply terminal VCC and the control terminal CTL in the antenna switch 220 are controlled by the level state of the power supply control signal to control whether the power supply terminal VCC and the control terminal CTL in the antenna switch 220 are powered at the same time, thereby controlling the on-off state of the antenna switch 220. For example, 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 powered at the same time, so that the antenna switch 220 is in a conducting state, so as to adjust the matching network corresponding to the antenna body 210, thereby switching the working frequency band of the antenna body 210 to the transmitting frequency band. 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, so as to adjust the matching network corresponding to the antenna body 210, thereby switching the working frequency band of the antenna body 210 to the receiving frequency band.

[0041] It should be noted that Figure 3 FIG. 1 is a schematic diagram of a structure of an external antenna provided in 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 board 260, wherein the first end of the RF transmission line 300 is connected to the central feed line core point of the antenna base 250, and the central feed line core point of the antenna base 250 is welded to the feeding point of the antenna board 260, thereby realizing the connection between the RF transmission line 300 and the antenna board 260. Figure 4 FIG. 2 is a second structural diagram of an external antenna provided in an embodiment of the present invention. Figure 4 As shown, the metal ground of the shell of the RF transmission line 300 is connected to the shell ground of the antenna base 250, the outer ring reference ground of the antenna plate 260 is welded to the shell ground of the antenna base 250, and the GND end of the antenna switch 220 is connected to the outer ring reference ground of the antenna plate 260, so that the shell ground of the RF transmission line 300, the shell ground of the antenna base 250, the outer ring reference ground of the antenna plate 260 and the GND end of the antenna switch 220 are connected to the common ground. In addition, the antenna body 210 is an antenna, and the shape of the antenna body 210 can be a spiral shape or other shapes. Taking the shape of the antenna body 210 as a spiral shape as an example, the antenna body 210 is welded to the spiral antenna welding point on the antenna plate 260.

[0042] 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 .

[0043] In the embodiment of the present invention, a power supply control signal of whether to power the antenna switch 220 is transmitted through the RF transmission line 300, that is, 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 to switch the working frequency band of the antenna body 210. When the external antenna 200 is small in size and low in frequency band, the antenna body 210 can achieve dual-band operation, thereby ensuring the communication performance of the wireless communication terminal.

[0044] Further, Figure 5 is a schematic diagram of the structure of a 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; 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 , wherein the switch control signal is configured to switch a target connection path between the first switch 140 and the RF transceiver 120 .

[0045] Specifically, in the terminal control system 100, the first switch 140 is a single-pole double-throw switch, the input port of the first switch 140 is connected in series with the first capacitor 150, and the first capacitor 150 is connected to the second end of the RF transmission line 300, and the first capacitor 150 is used to isolate direct current and conduct high-frequency signals. The two output ports of the first switch 140 are respectively connected to the transmitting port and the receiving port of the RF wireless transceiver 120, and the power supply terminal VCC and the control terminal CTL of the first switch 140 are connected to the controller 110. After the controller 110 supplies power to the first switch 140 through the power supply terminal VCC, it generates a corresponding switch control signal according to the transceiver state of the RF wireless transceiver 120. According to the different level states of the switch control signal, the target connection path between the first switch 140 and the RF wireless transceiver 120 can be switched. For example, when the switch control signal is a high-level signal, the first switch 140 can be controlled to conduct the target connection path between the transmitting port of the RF wireless transceiver 120 and the corresponding output port. 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 of the RF wireless transceiver 120 and the corresponding output port.

[0046] 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.

[0047] 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 chip 130, so that the power chip 130 can control whether to power the antenna switch 220 through the RF transmission line 300 according to the level state of the power control signal, that is, control the on-off state of the antenna switch 220. In this process, the first inductor 160 is used to isolate high-frequency signals to prevent the power supply line from affecting the RF transmission. The second capacitor 170 is in a short-circuit grounding state at high frequency, which can further eliminate the impact of the back-end power supply line on the RF transmission. At the same time, the second capacitor 170 is a large grounded capacitor, which is in an open-circuit state in direct current, does not affect the normal operation of the power supply line, and realizes the common ground connection of the shell of the RF transmission line 300 and the ground end of the terminal control system 100.

[0048] Further, Figure 6 FIG. 3 is a third structural diagram of an external antenna provided in an embodiment of the present invention. Figure 6As shown, the external antenna 200 also includes a second inductor 230 and a matching component 240, wherein: 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 a power terminal VCC and a control terminal CTL of the antenna switch 220 ; The matching component 240 is also 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 .

[0049] Specifically, in the external antenna 200, the second inductor 230 is connected to the first end of the RF transmission line 300, and the second inductor 230 is used to isolate the high-frequency signal. The matching component 240 is a matching network of the antenna body 210. Different connection states of the matching component 240 indicate different matching networks of the antenna body 210, and further indicate different operating frequency bands of the antenna body 210. Therefore, the operating frequency band of the antenna body 210 can be switched by adjusting the connection state in the matching component 240, thereby realizing dual-band operation of the antenna body 210.

[0050] Furthermore, the matching component 240 includes a third capacitor 241, a matching device 242 and a matching circuit 243, wherein: A first end of the third capacitor 241 is connected to the RF transmission line 300 and a first end of the second inductor 230 , and a second end of the third capacitor 241 is connected to a first end of the matching device 242 ; The matching circuit 243 is also connected to the antenna body 210 and the antenna switch 220; The second end of the matching device 242 is connected to the matching circuit 243 and the antenna switch 220 , or connected to the antenna body 210 .

[0051] Specifically, the second end of the RF transmission line 300 is also connected to a third capacitor 241, which is used to isolate direct current and conduct high-frequency signals. The third capacitor 241 is connected in series with a matching device 242, and the matching device 242 is a matching network with a fixed impedance. The matching circuit 243 is a matching network whose connection relationship changes dynamically with the on-off state of the antenna switch 220. The matching network of the antenna body 210 can be dynamically adjusted by combining the matching device 242 and the matching circuit 243, thereby adjusting the working frequency band of the antenna body 210. In an embodiment of the present invention, the matching circuit 243 is fixedly connected to the antenna body 210 and the antenna switch 220, and the connection relationship of the matching device 242 changes with the dynamic change of the matching circuit 243. In an embodiment of the present invention, three specific structures of the matching circuit 243 are provided. Therefore, correspondingly, in the first case, the matching device 242 can connect the matching circuit 243 and the antenna switch 220, and in the second and third cases, the matching device 242 can be directly connected to the antenna body 210.

[0052] Further, 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: A first end of the first series matching network 244 is connected to a second end of the matching device 242 and a 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 a first end of the second series matching network 245, and a second end of the second series matching network 245 is connected to a second end of the antenna switch 220; 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 to adjust the matching network of the antenna body 210 .

[0053] For example, Figure 7 FIG. 4 is a fourth structural diagram of an external antenna provided in an embodiment of the present invention. 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, and 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 is connected in series with the matching device 242. The antenna body 210 is equivalent to a first matching network composed of the first series matching network 244 and the matching device 242 connected in series. 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 powered at the same time, 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 connecting 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.

[0054] It should be noted that the impedance of the first series matching network 244 and the second series matching network 245 can be the same or different, and the embodiment of the present invention does not limit this. In addition, the impedance of the matching device 242 is different from the impedance of any one of the first series matching network 244 and the second series matching network 245.

[0055] 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, and it is sufficient to ensure that 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.

[0056] 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: 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, and a second end of the second parallel matching network 247 is connected to a second end of the antenna switch 220; 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 .

[0057] For example, Figure 8 FIG. 5 is a structural diagram of an external antenna provided in an embodiment of the present invention. Figure 8 As 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, and the second parallel matching network 247 is not connected because the antenna switch 220 is open-circuited. At this time, only the first parallel matching network 246 is connected in parallel with the matching device 242, and the antenna body 210 is equivalent to a third matching network formed by the first parallel matching network 246 and the matching device 242 in parallel. The third matching network can make the antenna body 210 work 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 powered at the same time, so that the antenna switch 220 is in a conducting state. At this time, the second parallel matching network 247 is connected in parallel with the first parallel matching network 246 to form a second parallel equivalent circuit. At this time, the antenna body 210 is equivalent to a fourth matching network formed by the second parallel equivalent circuit and the matching device 242 in parallel, and the fourth matching network can enable the antenna body 210 to work in the transmission frequency band.

[0058] It should be noted that the impedance 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 the embodiment of the present invention. In addition, the impedance of the matching device 242 is different from the impedance of any one of the first parallel matching network 246 and the second parallel matching network 247.

[0059] It should be noted that in the embodiment of the present invention, there is no limitation on the working frequency bands corresponding to the third matching network and the fourth matching network, and it is sufficient to ensure that the working frequency bands corresponding to the third matching network and the fourth matching network are different. For example, when the working frequency band corresponding to the third matching network is the receiving frequency band, the working frequency band corresponding to the fourth matching network is the transmitting frequency band; when the working frequency band corresponding to the third matching network is the transmitting frequency band, the working frequency band corresponding to the fourth matching network is the receiving frequency band.

[0060] 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.

[0061] For example, Fig. 9 FIG. 6 is a sixth structural diagram of an external antenna provided in an embodiment of the present invention. Fig. 9 As 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, and the third parallel matching network 248 is not connected because the antenna switch 220 is open. At this time, the antenna body 210 is equivalent to the fifth matching network consisting of only the matching device 242 in parallel, and the fifth matching network can make the antenna body 210 work 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 powered at the same time, so that the antenna switch 220 is in a conducting state. At this time, the third parallel matching network 248 is connected in parallel with the matching device 242. At this time, the antenna body 210 is equivalent to the sixth matching network consisting of the third parallel matching network 248 and the matching device 242 in parallel, and the sixth matching network can make the antenna body 210 work in the transmitting frequency band.

[0062] It should be noted that the impedance of the third parallel matching network 248 is different from the impedance of the matching device 242 .

[0063] 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, and 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.

[0064] In addition, the embodiment of the present invention also uses three-dimensional electromagnetic simulation software to establish 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, Fig.10 It is a structural schematic diagram of an external antenna provided by the prior art, such as Fig.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. Fig.11is a schematic diagram of the antenna reflection coefficient of the external antenna provided by the prior art, such as Fig.11 As shown, the external antenna in the prior art is subjected to software simulation evaluation, and only one curve of the antenna reflection coefficient S(1,1) is obtained, that is, the external antenna in the prior art only supports a single frequency band of 0.3115 GHz.

[0065] Fig.12 is a schematic diagram of the structure of an external antenna provided in an embodiment of the present invention, such as Fig.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 works, 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 work, and the series matching is equivalent to the original series inductance effect. Fig.13 Schematic diagram of the antenna reflection coefficient of the external antenna provided in an embodiment of the present invention. Fig.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.

[0066] The external dual-frequency antenna switching system provided by the embodiment of the present invention determines the corresponding power control signal according to the transceiver state of the radio frequency wireless transceiver through the controller, and the power chip determines the power control signal used to characterize whether the power chip performs power output according to the power control signal, and sends the power control signal to the antenna switch through the radio frequency transmission line, and controls whether to power the antenna switch according to the power control signal to control the on-off state of the antenna switch, and adjusts the matching network of the antenna body according to the on-off state of the antenna switch, thereby switching the working frequency band of the antenna body. In the embodiment of the present invention, the power control signal corresponding to the antenna switch is transmitted through the radio frequency transmission line, that is, the radio frequency transmission line is reused as the power supply line, so as to realize the switching of the working frequency band of the antenna body according to the transceiver state of the radio frequency wireless transceiver, without increasing the size of the antenna, and ensures that the size of the external antenna is small and the dual-band operation of the antenna body is met in the low frequency band, thereby ensuring the communication performance of the wireless communication terminal.

[0067] The embodiment of the present invention further provides an external dual-frequency antenna switching method, which is applied to the external dual-frequency antenna switching system as described in any one of the above items. Fig.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. Fig.14 As shown, the method includes step 1410.

[0068] Step 1410, determine a power control signal based on the corresponding receiving and transmitting state of the RF wireless transceiver; the power control signal is used to control the power chip to determine the power control signal, and the power control signal is used to indicate whether the power chip outputs power; the power 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.

[0069] The external dual-frequency antenna switching method provided in the embodiment of the present invention determines the corresponding power control signal according to the transceiver state of the radio frequency wireless transceiver, determines the power control signal used to characterize whether the power chip performs power output according to the power control signal, controls whether to power the antenna switch according to the power control signal, controls the on-off state of the antenna switch, and adjusts the matching network of the antenna body according to the on-off state of the antenna switch, thereby switching the working frequency band of the antenna body. In the embodiment of the present invention, the working frequency band of the antenna body can be switched according to the transceiver state of the radio frequency wireless transceiver without increasing the size of the antenna, and ensures that the external antenna size is small and the dual-frequency band operation of the antenna body is met in the low frequency band, thereby ensuring the communication performance of the wireless communication terminal.

[0070] Fig.15 is a schematic diagram of the structure of a controller provided by an embodiment of the present invention, such as Fig.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 through the communications bus 1540. The processor 1510 may call the logic instructions in the memory 1530 to execute the external dual-frequency antenna switching method, the method comprising: determining a power control signal based on the transceiver state corresponding to the radio frequency wireless transceiver; the power control signal is used to control the power chip to determine the power control signal, the power control signal is used to indicate whether the power chip outputs power; the power 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.

[0071] In addition, the logic instructions in the above-mentioned memory 1530 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform 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 codes, such as a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk.

[0072] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program 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-mentioned methods, the method including: determining a power control signal based on the transceiver state corresponding to the radio frequency 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 characterize 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.

[0073] 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 comprising: determining a power control signal based on the transceiver state corresponding to the radio frequency 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 characterize 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 working frequency band of the antenna body.

[0074] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0075] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0076] 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 embodiments of the present invention.

Claims

1. An external dual-frequency 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 state 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, wherein the antenna switch is used to receive the power supply control signal based on the radio frequency transmission line, and 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.

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 used to supply power to the first switch and generate a switch control signal corresponding to the transceiver state of the RF wireless transceiver, wherein the switch control signal is used to switch a target connection path between the first switch and the RF wireless 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, wherein 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-frequency antenna switching system according to any one of claims 1 to 3, characterized in that: The external antenna also 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 end and a control end 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 the 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: The 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, the 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 the 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 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 the 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: The first end of the first parallel matching network is connected to the antenna body and the first end of the antenna switch, the 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 the 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-frequency antenna switching system according to any one of claims 1 to 8, the method comprising: Based on the receiving and transmitting state corresponding to the RF wireless transceiver, a power control signal is determined; the power control signal is used to control the power chip to determine the power control signal, and the power control signal is used to characterize whether the power chip outputs power; the power 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-frequency antenna switching method as claimed in claim 9 is implemented.

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