CN108111180B

CN108111180B - Tuning switch control circuit, antenna device and mobile terminal

Info

Publication number: CN108111180B
Application number: CN201711342027.9A
Authority: CN
Inventors: 杨怀; 伏奎
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-12-14
Filing date: 2017-12-14
Publication date: 2020-06-02
Anticipated expiration: 2037-12-14
Also published as: CN108111180A

Abstract

A tuning switch control circuit, an antenna device and a mobile terminal, wherein the tuning switch control circuit comprises an antenna, a first matching circuit, a first tuning switch, a radio frequency signal transmitter and a controller; the antenna comprises an antenna radiator and a first feed point, wherein a first matching circuit comprises M matching sub-circuits, a first tuning switch comprises M switch paths, the first matching sub-circuit is any one of the M matching sub-circuits, the first switch path is one of the M switch paths corresponding to the first matching sub-circuit, the first end of the first matching sub-circuit is connected with the first feed point, the second end of the first matching sub-circuit is connected with the first end of the first switch path, and the second end of the first switch path is grounded; the first control end of the controller is connected with the control end of the first tuning switch; the controller is used for controlling at least one switch path in the M switch paths to be conducted when the antenna works in the low-frequency mode. The embodiment of the invention can improve the over-standard harmonic of the radiation stray.

Description

Tuning switch control circuit, antenna device and mobile terminal

Technical Field

The invention relates to the technical field of terminals, in particular to a tuning switch control circuit, an antenna device and a mobile terminal.

Background

For mobile terminals such as mobile phones, the radiated stray is used as a mandatory authentication index, so that the authentication difficulty is high, and the problem to be solved is solved. For radio frequency signals in a Global System for Mobile communication (GSM) frequency band, the radio frequency signals include not only usable signals (GSM900), but also unwanted signals such as second harmonics and third harmonics, and when harmonic energy of the radio frequency signals reaches a resonance of an antenna, the harmonic energy is radiated, so that radiated spurious exceeds a standard.

At present, for a GSM frequency band, because the power of the frequency band is high, strong energy is easily excited instantly, so that radiated stray harmonic waves exceed the standard.

Disclosure of Invention

The embodiment of the invention provides a tuning switch control circuit, an antenna device and a mobile terminal, which can avoid the problem of radiation stray caused by an antenna tuning switch.

A first aspect of an embodiment of the present invention provides a tuning switch control circuit, including an antenna, a first matching circuit, a first tuning switch, a radio frequency signal transmitter, and a controller;

the antenna comprises an antenna radiator and a first feed point, the first matching circuit comprises M matching sub-circuits, the first tuning switch comprises M switch paths, the M matching sub-circuits correspond to the M switch paths one by one, the first matching sub-circuit is any one of the M matching sub-circuits, the first switch path is one of the M switch paths corresponding to the first matching sub-circuit, and M is a positive integer;

the first feed point is connected with a signal output end of the radio frequency signal transmitter, a first end of the first matching sub-circuit is connected with the first feed point, a second end of the first matching sub-circuit is connected with a first end of the first switch path, and a second end of the first switch path is grounded;

the controller comprises a first control end, and the first control end is connected with the control end of the first tuning switch; the controller is used for controlling at least one of the M switch paths to be conducted when the antenna works in a low-frequency mode.

A second aspect of the embodiments of the present invention provides an antenna apparatus, which includes a power amplifier and the tuning switch control circuit of the first aspect of the embodiments of the present invention.

A third aspect of the embodiments of the present invention provides a mobile terminal, including a terminal body and an antenna apparatus according to the second aspect of the embodiments of the present invention.

When the antenna works in a low-frequency mode, the electrical length of the antenna radiator just meets the working frequency of the antenna working in the low-frequency mode, so that the working frequency of the antenna is not required to be adjusted by using the first tuning switch, and all the M switch paths of the first tuning switch are disconnected. According to the embodiment of the invention, when the antenna works in a low-frequency mode, the controller controls at least one of the M switch paths to be conducted, so that high-frequency harmonic energy accumulated at the M capacitors can be eliminated, and the overproof of radiation stray harmonic can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a tuning switch control circuit according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another tuning switch control circuit disclosed in the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another tuning switch control circuit disclosed in the embodiments of the present invention;

FIG. 4 is a schematic structural diagram of another tuning switch control circuit disclosed in the embodiments of the present invention;

FIG. 5 is a schematic diagram of another tuning switch control circuit according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of another tuning switch control circuit according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of another tuning switch control circuit according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another tuning switch control circuit according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of an antenna device according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, system, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In addition, the Mobile terminal according to the embodiments of the present invention may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), Mobile Stations (MS), terminal devices (terminal device), and so on. For convenience of description, the above-mentioned devices are collectively referred to as a mobile terminal.

The following describes embodiments of the present invention in detail.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a tuning switch control circuit according to an embodiment of the present invention, and as shown in fig. 1, the tuning switch control circuit includes an antenna 11, a first matching circuit 12, a first tuning switch 13, a radio frequency signal transmitter 14, and a controller 15.

The antenna 11 includes an antenna radiator 111 and a first feeding point 112, the first matching circuit 12 includes M matching sub-circuits (121, 122,. 12M shown in fig. 1), the first tuning switch 13 includes M switching paths (131, 132,. 13M shown in fig. 1), the M matching sub-circuits correspond to the M switching paths one to one (121 and 131 correspond to each other, 122 and 132 correspond to each other, and. 12M and 13M correspond to each other), the first matching sub-circuit 121 is any one of the M matching sub-circuits, the first switching path 131 is one of the M switching paths corresponding to the first matching sub-circuit 121, and M is a positive integer.

The first feeding point 112 is connected to the signal output terminal 141 of the radio frequency signal transmitter 14, the first terminal 1211 of the first matching sub-circuit 121 is connected to the first feeding point 112, the second terminal 1212 of the first matching sub-circuit 121 is connected to the first terminal 1311 of the first switching path 131, and the second terminal 1312 of the first switching path 131 is grounded;

the controller 15 comprises a first control terminal 151, and the first control terminal 151 is connected to the control terminal 130 of the first tuning switch 13; the controller 15 is configured to control at least one of the M switch paths to be turned on when the antenna 11 operates in the low frequency mode.

The embodiment of the invention is suitable for the frequency bands of a Global System for mobile communication (GSM), and the GSM frequency bands can comprise a low frequency band (900MHz frequency band) and a high frequency band (1800MHz frequency band). When the antenna 11 works in a low-frequency mode, the antenna radiator radiates low-frequency signals of about 900 MHz; when the antenna 11 operates in the high-frequency mode, the antenna radiator radiates high-frequency signals of around 1800 MHz.

The antenna 11 in the embodiment of the present invention is excited by an electric field, when the antenna 11 operates as a transmitting antenna, the antenna radiator 111 is excited by applying a high voltage (for example, 60 volts to 100 volts) at the first feeding point 112 to radiate energy, and the antenna 11 receives a high-frequency current transmitted by the rf signal transmitter 14 through the first feeding point 112. According to the principle of electromagnetic induction, a high frequency current flowing through the antenna radiator 111 generates a magnetic field, thereby causing the antenna radiator 111 to radiate energy in the form of electromagnetic waves.

The rf signal transmitter 14 may be located on the motherboard, the first feeding point 112 is connected to the signal output end 141 of the rf signal transmitter 14, the first feeding point 112 is configured to receive an rf signal (the rf signal may be a modulated high-frequency oscillating current signal) transmitted from the rf signal transmitter 14, and after the rf signal passes through the antenna radiator 111, the antenna radiator 111 radiates energy in the form of an electromagnetic wave.

The radio frequency signal may comprise a high frequency radio frequency signal and/or a low frequency radio frequency signal. When the antenna 11 operates in the low frequency mode as a transmitting antenna, the rf signal transmitter 14 itself should only transmit a specific low frequency rf signal, however, since the internal components of the rf signal transmitter 14 are not ideal devices, there are more or less non-linear devices, and during the transmission of the rf signal, many signals in the non-specified frequency range are generated, i.e. stray radiation occurs. The signals in the non-predetermined frequency range are generally high frequency harmonics such as second harmonic and third harmonic. Since the high frequency harmonics are not intended to be emitted by the rf signal transmitter 14 itself, it is desirable to reduce the radiation spurs caused by the high frequency harmonics.

When the antenna 11 operates in a low frequency mode as a transmitting antenna, an electrical length of the antenna radiator is required to be long in order to secure radiation efficiency. The entire antenna radiator 111 of the antenna 11 is set as the electrical length in the low frequency mode. Therefore, when the antenna 11 operates as a transmitting antenna in the low frequency mode, the electrical length does not need to be adjusted, and the first feeding point 112 does not need to be connected to any matching circuit, so that the M switch paths included in the first tuning switch 13 need to be turned off. Due to the existence of the high voltage at the first feeding point 112, the M switch paths are equivalent to M capacitors connected in parallel when being disconnected, first ends of the M capacitors are respectively connected with the M matching sub-circuits, and second ends of the M capacitors are grounded. The high-frequency harmonic energy in the rf signal output from the signal output terminal 141 of the rf signal transmitter 14 is accumulated at the first terminals of the M capacitors, and since the antenna 11 is excited by an electric field and the voltage difference between the two terminals of the M capacitors is large, the high voltage difference excites the nonlinearity in the first matching circuit 12, which brings the risk of radiation stray.

According to the embodiment of the invention, the controller 15 is added, the controller 15 is used for controlling at least one of the M switch paths to be conducted when the antenna 11 works in the low-frequency mode, which is equivalent to reducing the number of capacitors connected in parallel and reducing the capacitance effect, and the conduction of at least one of the M switch paths can eliminate the high-frequency harmonic energy accumulated at the first ends of the M capacitors, so that the excessive harmonic of radiation stray can be improved.

The controller 15 may be debugged in advance, and turn on one or more of the M switching paths to test the fluctuation condition of the operating frequency of the antenna 11 and the performance change of the radiation spurious, and select the switching path number with the minimum operating frequency fluctuation of the antenna 11 on the basis of the optimal performance of the radiation spurious. For example, assuming that M is 3, there are a total of the switch paths 1, 2 and 3, it is possible to select to test the fluctuation of the operating frequency of the antenna 11 with the switch paths 1, 2 turned on, test the fluctuation of the operating frequency of the antenna 11 with the switch paths 2, 3 turned on, test the fluctuation of the operating frequency of the antenna 11 with the switch paths 1, 2, 3 turned on, and if the fluctuation of the operating frequency of the antenna 11 with the switch paths 1, 2, 3 turned on, the controller 15 controls all of the 3 switch paths to be turned on when the antenna 11 operates in the low frequency mode.

Optionally, referring to fig. 2, fig. 2 is further optimized based on fig. 1, as shown in fig. 2, the tuning switch control circuit further includes an inductance tuning path 23, a first end 231 of the inductance tuning path 23 is connected to the first feeding point 112, and a second end 232 of the inductance tuning path 23 is grounded; controller 15 is also operable to control inductive tuning path 23 to be conductive when antenna 11 is operating in the low frequency mode, and controller 15 is also operable to control inductive tuning path 23 to be conductive when antenna 11 is operating in the high frequency mode.

The inductance tuning path 23 may include at least one inductance, and when the antenna 11 operates in the low-frequency mode and the inductance tuning path 23 is turned on, it is equivalent to eliminate the high-frequency harmonic energy accumulated at the first ends of the M capacitors, so that the exceeding of the radiation stray harmonics can be further improved.

In order to avoid the influence of the inductance in the inductance tuning path 23 on the high frequency mode when the antenna 11 is operating in the high frequency mode, the controller 15 is further configured to control the inductance tuning path 23 to be turned off when the antenna 11 is operating in the high frequency mode.

Optionally, referring to fig. 3, fig. 3 is further optimized based on fig. 2, as shown in fig. 3, the controller 15 further includes a second control terminal 152, the inductor tuning path 23 includes a first tuning inductor L1 and a first inductor switch T1, and the second control terminal 152 is connected to the control terminal 2341 of the first inductor switch T1. The first terminal 2331 of the first tuning inductor L1 is connected to the first feeding point 112, the second terminal 2332 of the first tuning inductor L1 is connected to the first terminal 2342 of the first inductor switch T1, and the second terminal 2343 of the first inductor switch T1 is connected to ground.

Optionally, the first terminal 2342 of the first inductive switch T1 is connected to the first feeding point 112, the second terminal 2343 of the first inductive switch T1 is connected to the first terminal 2331 of the first tuning inductor L1, and the second terminal 2332 of the first tuning inductor L1 is connected to ground.

In the embodiment of the present invention, the first tuning inductor L1 is connected in series with the first inductor switch T1, and the first tuning inductor L1 is connected to the ground through the first inductor switch T1, or the first inductor switch T1 is connected to the ground through the first tuning inductor L1. The first tuning inductor L1 may include one inductor, a plurality of inductors connected in parallel, or a plurality of inductors connected in series. The first inductor switch T1 may be any one of a metal-oxide semiconductor (MOS) field effect Transistor, an Insulated Gate Bipolar Transistor (IGBT), a triode, or other semiconductor switching device. The first inductive switch T1 in fig. 3 is exemplified by a MOS transistor.

For example, if the first inductive switch T1 is an NMOS transistor, when the antenna 11 operates in the low frequency mode, the second control terminal 152 of the controller 15 sends a high level signal (e.g., 4V) to the control terminal 2341 of the first inductive switch T1 to control the conduction of the inductive tuning path 23; when the antenna 11 operates in the high frequency mode, the second control terminal 152 of the controller 15 sends a low level signal (e.g., having a level value of 0V) to the control terminal 2341 of the first inductive switch T1 to control the inductive tuning path 23 to turn off.

If the first inductive switch T1 is a PMOS transistor, when the antenna 11 operates in the low frequency mode, the second control terminal 152 of the controller 15 sends a low level signal (e.g., a level value of 0V) to the control terminal 2341 of the first inductive switch T1 to control the conduction of the inductive tuning path 23; when the antenna 11 operates in the high frequency mode, the second control terminal 152 of the controller 15 sends a high level signal (e.g., having a level value of 4V) to the control terminal 2341 of the first inductive switch T1 to control the inductive tuning path 23 to turn off.

Optionally, referring to fig. 4, fig. 4 is further optimized based on fig. 1, as shown in fig. 4, the tuning switch control circuit further includes a first tuning inductor module 16, a first end 161 of the first tuning inductor module 16 is connected to a second end 1212 of the first matching sub-circuit 121, and a second end 162 of the first tuning inductor module 16 is grounded.

In the embodiment of the present invention, by adding the first tuning inductor module 16, which is equivalent to connecting an inductor in parallel on the basis of the M capacitors, the high-frequency harmonic energy accumulated at the M capacitors can be eliminated, and the problem of radiation stray of the high-frequency harmonic that may occur when the first tuning switch 13 is turned off is avoided, so that the harmonic exceeding of the radiation stray can be improved.

The first tuning inductor module 16 may include one inductor, may also include a plurality of inductors connected in parallel, may also include a plurality of inductors connected in series, and may also include a plurality of inductors connected in parallel and connected in series. The second terminal of the first tuning inductor module 16 is grounded, and the first tuning inductor module 16 can pull the voltage accumulated at the M capacitors to the ground, so that the high-frequency harmonic waves accumulated at the M capacitors in the radio frequency signal output by the signal output terminal 141 of the radio frequency signal transmitter 14 can be eliminated, and the over-standard of the radiation stray harmonic waves can be improved. Meanwhile, the first tuning inductance module 16 may also generate resonance with the M capacitors, and the resonance frequency is equivalent to a disconnection effect for the low-frequency signal, and does not affect the radiation efficiency of the low-frequency signal.

Optionally, referring to fig. 5, fig. 5 is further optimized based on fig. 4, as shown in fig. 5, the controller 15 further includes a third control terminal 153, the first tuning inductor module 16 includes a second tuning inductor L2 and a second inductor switch T2, and the third control terminal 153 is connected to the control terminal 1621 of the second inductor switch T2. The first terminal 1611 of the second tuning inductor L2 is connected to the second terminal 1212 of the first matching sub-circuit 121, the second terminal 1612 of the second tuning inductor L2 is connected to the first terminal 1622 of the second inductive switch T2, and the second terminal 1623 of the second inductive switch T2 is grounded.

Optionally, the first terminal 1622 of the second inductive switch T2 is connected to the second terminal 1212 of the first matching sub-circuit 121, the second terminal 1623 of the second inductive switch T2 is connected to the first terminal 1611 of the second tuning inductor L2, and the second terminal 1612 of the second tuning inductor L2 is grounded.

In the embodiment of the present invention, the second tuning inductor L2 is connected in series with the second inductor switch T2, and the second tuning inductor L2 is connected to the ground through the second inductor switch T2, or the second inductor switch T2 is connected to the ground through the second tuning inductor L2. The second tuning inductor L2 may include one inductor, a plurality of inductors connected in parallel, or a plurality of inductors connected in series. The second inductive switch T2 may be any one of a MOS field effect transistor, an IGBT, a triode, and other semiconductor switching devices. The second inductive switch T2 in fig. 5 is exemplified by a MOS transistor.

For example, if the second inductive switch T2 is an NMOS transistor, when the antenna 11 operates in the low frequency mode, the third control terminal 153 of the controller 15 sends a high level signal (e.g., a level value of 4V) to the control terminal 1621 of the second inductive switch T2 to control the second inductive switch T2 to be turned on; when the antenna 11 operates in the high frequency mode, the third control terminal 153 of the controller 15 transmits a low level signal (e.g., having a level value of 0V) to the control terminal 1621 of the second inductive switch T2 to control the second inductive switch T2 to turn off.

If the second inductive switch T2 is a PMOS transistor, when the antenna 11 operates in the low frequency mode, the third control terminal 153 of the controller 15 sends a low level signal (e.g., a level value of 0V) to the control terminal 1621 of the second inductive switch T2 to control the second inductive switch T2 to be turned on; when the antenna 11 operates in the high frequency mode, the third control terminal 153 of the controller 15 transmits a high level signal (e.g., having a level value of 4V) to the control terminal 1621 of the second inductive switch T2 to control the second inductive switch T2 to turn off.

Referring to fig. 6, fig. 6 is a schematic structural diagram of another tuning switch control circuit disclosed in the embodiment of the present invention, fig. 6 is obtained by further optimization based on the foregoing fig. 1, and as shown in fig. 6, the tuning switch control circuit further includes a second feeding point 113, a second matching circuit 17, and a second tuning switch 18;

the second matching circuit 17 includes N matching sub-circuits (e.g., 171, 172,.. 17N shown in fig. 3), the second tuning switch 18 includes N switching paths (e.g., 181, 182,.. 18N shown in fig. 3), the N matching sub-circuits correspond to the N switching paths one-to-one, the second matching sub-circuit 171 is any one of the N matching sub-circuits, the second switching path 181 is one of the N switching paths corresponding to the second matching sub-circuit 171, and N is a positive integer;

the first end 1711 of the second matching sub-circuit 171 is connected to the second feeding point 113, the second end 1712 of the second matching sub-circuit 171 is connected to the first end 1811 of the second switch path 181, and the second end 1812 of the second switch path 181 is grounded.

The second feeding point 113 and the first feeding point 112 are located at different positions of the antenna, and a distance between the second feeding point 113 and the first feeding point 112 is smaller than a length of the antenna radiator 111. The second feeding point 113 is mainly used to adjust the electrical length of the antenna 11 in the high frequency mode to change the operating frequency of the antenna 11. When the antenna 11 operates in the high-frequency mode, the electrical length of the antenna is: the antenna radiator 111 has a section between the second feeding point 113 and the first feeding point 112. When the antenna 11 operates in the low frequency mode, the electrical length of the antenna 11 is the length of the entire antenna radiator 111.

The second tuning switch 18 is used in cooperation with the first tuning switch 13 when the antenna 11 operates in the high-frequency mode to achieve accurate adjustment of the operating frequency of the high-frequency signal of the antenna 11.

Optionally, as shown in fig. 6, the controller 15 further includes a fourth control terminal 154, and the fourth control terminal 154 is connected to the control terminal 180 of the second tuning switch 18;

when the antenna 11 operates in the low frequency mode, the controller 15 controls all of the N switching paths of the second tuning switch 18 to be turned off.

When the antenna 11 operates in a low frequency mode, such as 900MHz, there is no need to adjust the operating frequency of the antenna 11. The second feeding point 113 does not need to be connected to any matching circuit and therefore the N switching paths of the second tuning switch 18 need to be completely disconnected. And the interference to the low-frequency working frequency of the antenna 11 after the second tuning switch 18 is turned on is avoided.

Optionally, when the antenna 11 operates in the high-frequency mode, the controller 15 controls at least one of the N switch paths of the second tuning switch 18 to be turned on.

When at least one of the N switching paths of the second tuning switch 18 is turned on, the operating frequency of the antenna 11 in the high frequency mode can be adjusted by adjusting which one or ones of the N switching paths is/are turned on.

Optionally, when at least one of the N switching paths is turned on, at least one matching subcircuit connected to the at least one of the N switching paths is used to adjust the impedance of the antenna.

When at least one of the N switching paths of the second tuning switch 18 is turned on, at least one matching subcircuit connected to the at least one of the N switching paths is connected to the antenna radiator 111, and the at least one matching subcircuit can adjust the impedance of the antenna 11, so that the impedance of the antenna 11 is matched with the impedance of the feeder connected to the first feeding point 112, and the tuning switch control circuit operates in an impedance matching state. The matching sub-circuit can not only adjust the working frequency of the antenna 11 in the high-frequency mode, but also adjust the tuning switch control circuit to work in an impedance matching state. The matching sub-circuit can be a pi-type matching circuit consisting of an inductor and two capacitors.

Optionally, referring to fig. 7, fig. 7 is further optimized based on fig. 6, and as shown in fig. 7, the tuning switch control circuit further includes a second tuning inductor module 19, a first end 191 of the second tuning inductor module 19 is connected to the second end 1712 of the second matching sub-circuit 171, and a second end 192 of the second tuning inductor module 19 is grounded.

Since the first feeding point 112 has a high voltage, the N switching paths correspond to N capacitors when being opened, and when the antenna 11 is in the low frequency operation mode, high frequency harmonic energy in the rf signal output from the signal output terminal 141 of the rf signal transmitter 14 is accumulated at first terminals of the N capacitors, and second terminals of the N capacitors are grounded.

In the embodiment of the present invention, by adding the second tuning inductor module 19, which is equivalent to connecting an inductor in parallel on the basis of the N capacitors, the high-frequency harmonic energy accumulated at the N capacitors can be eliminated, and the problem of radiation stray of the high-frequency harmonic that may occur when the second tuning switch 18 is turned off is avoided, so that the harmonic exceeding of the radiation stray can be improved.

Optionally, referring to fig. 8, fig. 7 is further optimized based on fig. 7, as shown in fig. 8, the controller 15 further includes a fifth control terminal 155, the second tuning inductor module 19 includes a third tuning inductor L3 and a third inductor switch T3, and the fifth control terminal 155 is connected to a control terminal 1921 of the third inductor switch T3.

The first end 1911 of the third tuning inductor L3 is connected to the second end 1712 of the second matching sub-circuit 171, the second end 1912 of the third tuning inductor L3 is connected to the first end 1922 of the third inductive switch T3, and the second end 1923 of the third inductive switch T3 is grounded.

Optionally, the first terminal 1922 of the third inductive switch T3 is connected to the second terminal 1712 of the second matching sub-circuit 171, the second terminal 1923 of the third inductive switch T3 is connected to the first terminal 1911 of the third tuning inductor L3, and the second terminal 1912 of the third tuning inductor L3 is grounded.

In the embodiment of the present invention, the third tuning inductor L3 is connected in series with the third inductor switch T3, and the third tuning inductor L3 is connected to the ground through the third inductor switch T3, or the third inductor switch T3 is connected to the ground through the third tuning inductor L3. The third tuning inductor L3 may include one inductor, a plurality of inductors connected in parallel, or a plurality of inductors connected in series. The third inductive switch T3 may be any one of MOS field effect transistors, insulated gate double IGBTs, triodes, and other semiconductor switching tubes. The third inductive switch T3 in fig. 8 is exemplified by a MOS transistor.

Optionally, the signal output 141 of the rf signal transmitter 14 is configured to output a low-frequency rf signal or a high-frequency rf signal to the first feeding point;

when the rf signal transmitter 14 outputs a low-frequency rf signal to the first feeding point 112, the antenna operates in a low-frequency mode;

when the rf signal transmitter 12 outputs a high-frequency rf signal to the first feeding point 113, the antenna operates in a high-frequency mode;

the low-frequency radio frequency signal comprises a global system for mobile communication GSM8500 megahertz or GSM900 megahertz; the high frequency radio frequency signal comprises GSM1800 mhz.

Referring to fig. 9, fig. 9 is a schematic structural diagram of an antenna apparatus 20 according to an embodiment of the present invention, in which the antenna apparatus 20 includes a tuning switch control circuit 10 and a power amplifier 21, and the power amplifier 21 is connected between a second feeding point 113 and a radio frequency signal transmitter 14. The power amplifier 21 is configured to amplify the high-frequency radio frequency signal or the low-frequency radio frequency signal sent by the radio frequency signal transmitter 14 and output the amplified high-frequency radio frequency signal or the amplified low-frequency radio frequency signal to the second feeding point 113. Wherein, the tuning switch control circuit 10 may be any one of fig. 1 to 8.

When the antenna device shown in fig. 9 is implemented, when the antenna operates in the low-frequency mode, the controller controls at least one of the M switch paths to be turned on, so that the high-frequency harmonic energy accumulated at the M capacitors can be eliminated, and the over-standard of the radiation stray harmonic can be improved.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention, where the mobile terminal 30 includes the antenna device 20 shown in fig. 7 and a terminal main body 31, and the terminal main body 31 may include other components such as a display screen, a processor, a memory, and a power supply. The mobile terminal may be a mobile phone. Wherein, the tuning switch control circuit 10 may be any one of fig. 1 to 8.

When the mobile terminal shown in fig. 10 is implemented, when the antenna operates in the low-frequency mode, the controller controls at least one of the M switch paths to be turned on, so that the high-frequency harmonic energy accumulated at the M capacitors can be eliminated, and the over-standard of the radiation stray harmonic can be improved.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The foregoing detailed description of the embodiments of the present invention has been presented for the purpose of illustrating the principles and implementations of the present invention, and the description of the embodiments is only provided to assist understanding of the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A tuning switch control circuit is characterized by comprising an antenna, a first matching circuit, a first tuning switch, a radio frequency signal transmitter and a controller;

the controller comprises a first control end, and the first control end is connected with the control end of the first tuning switch; the controller is used for controlling at least one of the M switch paths to be conducted when the antenna works in a low-frequency mode;

wherein the circuit further comprises an inductive tuning path, a first end of the inductive tuning path is connected to the first feed point, and a second end of the inductive tuning path is grounded; the controller is further configured to control the inductor tuning path to conduct when the antenna operates in a low frequency mode.

2. The circuit of claim 1, wherein the controller further comprises a second control terminal, wherein the inductor tuning path comprises a first tuning inductor and a first inductor switch, and wherein the second control terminal is coupled to the control terminal of the first inductor switch.

3. The circuit of claim 2, wherein a first terminal of the first inductive switch is connected to the first feed point, a second terminal of the first inductive switch is connected to a first terminal of the first tuning inductor, and a second terminal of the first tuning inductor is connected to ground.

4. The circuit of claim 2, wherein a first terminal of the first tuning inductor is connected to the first feed point, a second terminal of the first tuning inductor is connected to a first terminal of the first inductor switch, and a second terminal of the first inductor switch is connected to ground.

5. The circuit according to any of claims 1-4, wherein the circuit further comprises a second feed point, a second matching circuit, and a second tuning switch;

the second matching circuit comprises N matching sub-circuits, the second tuning switch comprises N switch paths, the N matching sub-circuits are in one-to-one correspondence with the N switch paths, the second matching sub-circuit is any one of the N matching sub-circuits, the second switch path is one of the N switch paths corresponding to the second matching sub-circuit, and N is a positive integer;

the first end of the second matching sub-circuit is connected to the second feeding point, the second end of the second matching sub-circuit is connected to the first end of the second switch path, and the second end of the second switch path is grounded.

6. The circuit of claim 5, wherein the controller further comprises a fourth control terminal, the fourth control terminal being connected to the control terminal of the second tuning switch;

and when the antenna works in a low-frequency mode, the controller controls the N switch paths of the second tuning switch to be completely disconnected.

7. The circuit of claim 6, wherein the controller controls at least one of the N switching paths of the second tuning switch to conduct when the antenna is operating in a high frequency mode.

8. The circuit of claim 7, wherein at least one matching subcircuit connected to at least one of the N switching paths is configured to adjust the impedance of the antenna when the at least one of the N switching paths is conductive.

9. The circuit of claim 5, further comprising a second tuning inductance module, a first end of the second tuning inductance module being connected to a second end of the second matching sub-circuit, a second end of the second tuning inductance module being connected to ground.

10. The circuit of claim 9, wherein the controller further comprises a fifth control terminal, wherein the second tuning inductor module comprises a third tuning inductor and a third inductor switch, and wherein the fifth control terminal is connected to the control terminal of the third inductor switch.

11. The circuit of claim 10, wherein a first terminal of the third inductive switch is coupled to a second terminal of the second matching sub-circuit, a second terminal of the third inductive switch is coupled to a first terminal of the third tuning inductor, and a second terminal of the third tuning inductor is coupled to ground.

12. The circuit of claim 10, wherein a first terminal of the third tuning inductor is connected to a second terminal of the second matching sub-circuit, a second terminal of the third tuning inductor is connected to a first terminal of the third inductive switch, and a second terminal of the third inductive switch is connected to ground.

13. The circuit of claim 6, the signal output of the radio frequency signal transmitter is configured to output a low frequency radio frequency signal or a high frequency radio frequency signal to the first feeding point;

when the radio frequency signal transmitter outputs the low-frequency radio frequency signal to the first feeding point, the antenna works in a low-frequency mode;

when the radio frequency signal transmitter outputs the high-frequency radio frequency signal to the first feeding point, the antenna works in a high-frequency mode;

the low-frequency radio frequency signal comprises a global system for mobile communication (GSM) 8500 megahertz or a GSM900 megahertz; the high frequency radio frequency signal comprises GSM1800 mhz.

14. The circuit of claim 7, the signal output of the radio frequency signal transmitter is configured to output a low frequency radio frequency signal or a high frequency radio frequency signal to the first feeding point;

15. The circuit of claim 8, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

16. The circuit of claim 9, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

17. The circuit of claim 10, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

18. The circuit of claim 11, the signal output of the rf signal transmitter is configured to output a low frequency rf signal or a high frequency rf signal to the first feeding point;

19. The circuit of claim 12, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

20. A tuning switch control circuit is characterized by comprising an antenna, a first matching circuit, a first tuning switch, a radio frequency signal transmitter and a controller;

the circuit further comprises a first tuning inductance module, wherein a first end of the first tuning inductance module is connected with a second end of the first matching sub-circuit, and a second end of the first tuning inductance module is grounded.

21. The circuit of claim 20, wherein the controller further comprises a third control terminal, wherein the first tuning inductor module comprises a second tuning inductor and a second inductor switch, and wherein the third control terminal is coupled to the control terminal of the second inductor switch.

22. The circuit of claim 21, wherein a first terminal of the second inductive switch is coupled to a second terminal of the first matching sub-circuit, a second terminal of the second inductive switch is coupled to a first terminal of the second tuning inductor, and a second terminal of the second tuning inductor is coupled to ground.

23. The circuit of claim 21, wherein a first terminal of the second tuning inductor is coupled to a second terminal of the first matching sub-circuit, a second terminal of the second tuning inductor is coupled to a first terminal of the second inductive switch, and a second terminal of the second inductive switch is coupled to ground.

24. The circuit according to any of claims 20-23, wherein the circuit further comprises a second feed point, a second matching circuit, and a second tuning switch;

25. The circuit of claim 24, wherein the controller further comprises a fourth control terminal, the fourth control terminal being connected to the control terminal of the second tuning switch;

26. The circuit of claim 25, wherein the controller controls at least one of the N switching paths of the second tuning switch to conduct when the antenna is operating in a high frequency mode.

27. The circuit of claim 26, wherein at least one matching subcircuit connected to at least one of the N switching paths is configured to adjust the impedance of the antenna when the at least one of the N switching paths is conductive.

28. The circuit of claim 24, further comprising a second tuning inductance module, a first end of the second tuning inductance module being connected to a second end of the second matching sub-circuit, a second end of the second tuning inductance module being connected to ground.

29. The circuit of claim 28, wherein the controller further comprises a fifth control terminal, wherein the second tuning inductor module comprises a third tuning inductor and a third inductor switch, and wherein the fifth control terminal is coupled to a control terminal of the third inductor switch.

30. The circuit of claim 29, wherein a first terminal of the third inductive switch is coupled to a second terminal of the second matching sub-circuit, a second terminal of the third inductive switch is coupled to a first terminal of the third tuning inductor, and a second terminal of the third tuning inductor is coupled to ground.

31. The circuit of claim 29, wherein a first terminal of the third tuning inductor is connected to a second terminal of the second matching sub-circuit, a second terminal of the third tuning inductor is connected to a first terminal of the third inductive switch, and a second terminal of the third inductive switch is connected to ground.

32. The circuit of claim 25, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

33. The circuit of claim 26, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

34. The circuit of claim 27, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

35. The circuit of claim 28, wherein the signal output of the rf signal transmitter is configured to output a low frequency rf signal or a high frequency rf signal to the first feeding point;

36. The circuit of claim 29, wherein the signal output of the rf signal transmitter is configured to output a low frequency rf signal or a high frequency rf signal to the first feeding point;

37. The circuit of claim 30, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

38. The circuit of claim 31, the signal output of the rf signal transmitter being configured to output a low frequency rf signal or a high frequency rf signal to the first feed point;

39. A tuning switch control circuit is characterized by comprising an antenna, a first matching circuit, a first tuning switch, a radio frequency signal transmitter and a controller;

wherein the circuit further comprises a second feed point, a second matching circuit and a second tuning switch;

40. The circuit of claim 39, wherein the controller further comprises a fourth control terminal, the fourth control terminal being connected to the control terminal of the second tuning switch;

41. The circuit of claim 40, wherein the controller controls at least one of the N switching paths of the second tuning switch to conduct when the antenna is operating in a high frequency mode.

42. The circuit of claim 41, wherein at least one matching subcircuit connected to at least one of the N switching paths is configured to adjust the impedance of the antenna when the at least one of the N switching paths is conductive.

43. The circuit of claim 39, further comprising a second tuning inductance module, a first end of the second tuning inductance module being connected to a second end of the second matching sub-circuit, a second end of the second tuning inductance module being connected to ground.

44. The circuit of claim 43, wherein the controller further comprises a fifth control terminal, wherein the second tuning inductor module comprises a third tuning inductor and a third inductor switch, and wherein the fifth control terminal is coupled to the control terminal of the third inductor switch.

45. The circuit of claim 44, wherein a first terminal of the third inductive switch is coupled to a second terminal of the second matching sub-circuit, a second terminal of the third inductive switch is coupled to a first terminal of the third tuning inductor, and a second terminal of the third tuning inductor is coupled to ground.

46. The circuit of claim 44, wherein a first terminal of the third tuning inductor is connected to a second terminal of the second matching sub-circuit, a second terminal of the third tuning inductor is connected to a first terminal of the third inductive switch, and a second terminal of the third inductive switch is connected to ground.

47. The circuit of any one of claims 40-46, wherein the signal output of the RF signal transmitter is configured to output a low frequency RF signal or a high frequency RF signal to the first feed point;

48. An antenna device, comprising a power amplifier and the tuning switch control circuit as claimed in any one of claims 1-47, wherein the power amplifier is configured to amplify a radio frequency signal transmitted by the radio frequency signal transmitter and output the amplified radio frequency signal to the antenna.

49. A mobile terminal, characterized in that it comprises a terminal body and an antenna device according to claim 48.