CN108183331B - Antenna tuning circuit, antenna device and mobile terminal - Google Patents
Antenna tuning circuit, antenna device and mobile terminal Download PDFInfo
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- CN108183331B CN108183331B CN201711339213.7A CN201711339213A CN108183331B CN 108183331 B CN108183331 B CN 108183331B CN 201711339213 A CN201711339213 A CN 201711339213A CN 108183331 B CN108183331 B CN 108183331B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
The embodiment of the invention discloses an antenna tuning circuit, an antenna device and a mobile terminal, wherein the antenna tuning circuit comprises an antenna, a first matching circuit, a first tuning switch, a radio frequency signal transmitter and a first tuning inductance module; the antenna comprises an antenna radiator, a first feed point and a second feed point, wherein the first matching circuit comprises M matching sub-circuits, the first tuning switch comprises M switch paths, the first matching sub-circuit is any one of the M matching sub-circuits, and 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, the second end of the first switch path is grounded, the first end of the first tuning inductance module is connected with the second end of the first matching sub-circuit, and the second end of the first tuning inductance module is grounded. The embodiment of the invention can improve the over-standard harmonic of the radiation stray.
Description
Technical Field
The invention relates to the technical field of terminals, in particular to an antenna tuning 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 an antenna tuning 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 an antenna tuning circuit, including an antenna, a first matching circuit, a first tuning switch, a radio frequency signal transmitter, and a first tuning inductance module;
the antenna comprises an antenna radiator, a first feed point and a second 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 second 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, a second end of the first switch path is grounded, 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.
A second aspect of the embodiments of the present invention provides an antenna apparatus, which includes a power amplifier and the antenna tuning 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, because M switch paths of the first tuning switch are all disconnected, the M switch paths are equivalent to M capacitors when being disconnected, and high-frequency harmonic energy in a radio-frequency signal output by a signal output end of a radio-frequency signal transmitter can be accumulated at the M capacitors.
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 an antenna tuning circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another antenna tuning circuit disclosed in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of another antenna tuning circuit disclosed in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of another antenna tuning circuit disclosed in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of another antenna tuning circuit disclosed in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of another antenna tuning circuit disclosed in the embodiment of the present invention;
fig. 7 is a schematic structural diagram of an antenna apparatus according to an embodiment of the present invention;
fig. 8 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 an antenna tuning circuit according to an embodiment of the present invention, and as shown in fig. 1, the antenna tuning circuit includes an antenna 11, a first matching circuit 12, a first tuning switch 13, a radio frequency signal transmitter 14, and a first tuning inductance module 15.
The antenna 11 includes an antenna radiator 111, a first feeding point 112, and a second feeding point 113, the first matching circuit 12 includes M matching sub-circuits (121, 122,. 12M shown in fig. 1), the first tuning switch 13 includes M switch paths (131, 132,. 13M shown in fig. 1), the M matching sub-circuits correspond to the M switch paths one-to-one (121 corresponds to 131, 122 corresponds to 132, and. 12M corresponds to 13M shown in fig. 1), the first matching sub-circuit 121 is any one of the M matching sub-circuits, the first switch path 131 is one of the M switch paths corresponding to the first matching sub-circuit 121, and M is a positive integer.
The second feeding point 113 is connected to the signal output terminal 141 of the radio frequency signal transmitter 14, the first end 1211 of the first matching sub-circuit 121 is connected to the first feeding point 112, the second end 1212 of the first matching sub-circuit 121 is connected to the first end 1311 of the first switching path 131, the second end 1312 of the first switching path 131 is grounded, the first end 151 of the first tuning inductance module 15 is connected to the second end 1212 of the first matching sub-circuit 121, and the second end 152 of the first tuning inductance module 15 is grounded.
The embodiment of the invention is suitable for Global System for Mobile communication (GSM) frequency bands, 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 second feeding point 113 to radiate energy, and the antenna 11 receives a high-frequency current transmitted by the rf signal transmitter 14 through the second feeding point 113. 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 second feeding point 113 is connected to the signal output terminal 141 of the rf signal transmitter 14, the second feeding point 113 is configured to receive an rf signal (the rf signal may be a modulated high-frequency oscillating current signal) sent 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 second feeding point 113, the M switching paths are equivalent to M capacitors when being disconnected, the first ends of the M capacitors are respectively connected to the M matching sub-circuits, and the 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.
In the embodiment of the present invention, by adding the first tuning inductor module 15, 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 15 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 parallel connection and series connection of a plurality of inductors. The second terminal of the first tuning inductor module 15 is grounded, and the first tuning inductor module 15 can pull the voltage accumulated at the M capacitors to the ground, so that the high-frequency harmonic energy 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 can be improved. Meanwhile, the first tuning inductance module 15 may also resonate with the M capacitors, and the resonant frequency is equivalent to a disconnection effect for the low-frequency signal, and does not affect the radiation efficiency of the low-frequency signal.
In this embodiment of the present invention, the first matching sub-circuit 121 is any one of M matching sub-circuits, the first end 151 of the first tuning inductor module 15 is connected to the second end 1212 of the first matching sub-circuit 121, and the second end 152 of the first tuning inductor module 15 is grounded. The second end of each of the M matching sub-circuits can be connected with a tuning inductance module, and the tuning inductance module can eliminate high-frequency harmonic energy accumulated at the second end of each of the M matching sub-circuits, so that the exceeding of radiation stray harmonics can be improved. According to the embodiment of the invention, M tuning inductance modules can be added, and each tuning inductance module can be used for eliminating higher harmonic energy, so that the higher harmonic elimination speed can be increased, and the exceeding standard of radiation stray harmonic can be quickly improved.
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 second feeding point 113;
when the rf signal transmitter 14 outputs a low-frequency rf signal to the second feeding point 113, the antenna 11 operates in the low-frequency mode, and all of the M switch paths included in the first tuning switch 13 are disconnected;
the first tuning inductance module 15 is used to cancel the energy at the first feeding point 112 when the antenna is operating in the low frequency mode.
Optionally, the low-frequency radio frequency signal includes a global system for mobile communications GSM8500 mhz or GSM900 mhz; the high frequency radio frequency signal comprises GSM1800 mhz.
In the embodiment of the present invention, when the rf signal transmitter 14 outputs the low-frequency rf signal to the second feeding point 113, the rf signal transmitter 14 itself should transmit only the low-frequency rf signal, however, since the internal components of the rf signal transmitter 14 are not ideal devices and have more or less nonlinear devices, in the process of transmitting the low-frequency rf signal, high-frequency harmonics such as a second harmonic and a third harmonic of the low-frequency rf signal are often accompanied. Since the first feeding point 112 is used when the antenna 11 operates at a high frequency, when the antenna 11 operates at a low frequency, the M switch paths of the first tuning switch 13 are all opened, which is equivalent to forming M capacitors, the first matching circuit 12 and the first tuning switch 13 connected to the first feeding point 112 are sensitive to high frequency signals, the energy of these higher harmonics reaches the first ends of the M capacitors through the first feeding point 112, and the second ends of the M capacitors are grounded. The first end 1311 of the first switch path 131 in the M switch paths is connected to the first end of the first tuning inductor module 15, and the first end 1311 of the first switch path 131 is equivalent to the first end of one of the M capacitors, so that the first tuning inductor module 15 can quickly release the voltage at the first end of one of the M capacitors, and release the energy of higher harmonics, thereby improving the over-standard of radiation stray harmonics.
Optionally, when the rf signal transmitter 14 outputs a high-frequency rf signal to the second feeding point 113, the antenna 11 operates in a high-frequency mode, and when the antenna 11 operates in the high-frequency mode, at least one of the M switching paths of the first tuning switch 13 is turned on.
When at least one of the M switch paths of the first tuning switch 13 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 M switch paths is/are turned on.
Optionally, when at least one of the M switch paths is turned on, at least one matching subcircuit connected to the at least one of the M switch paths is used to adjust the impedance of the antenna.
When at least one of the M switch paths of the first tuning switch 13 is turned on, at least one matching subcircuit connected to the at least one of the M switch 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 second feeding point 113, and the antenna tuning 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 working state of the antenna tuning circuit in the impedance matching state.
The matching sub-circuit can be a pi-type matching circuit consisting of an inductor and two capacitors.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another antenna tuning circuit according to an embodiment of the present invention, and fig. 2 is further optimized based on fig. 1. As shown in fig. 2, the antenna tuning circuit further includes a controller 16, the controller 16 includes a first control terminal 161, the first tuning inductor module 15 includes a first tuning inductor L1 and a first inductor switch T1, the first control terminal 161 is connected to the control terminal 1521 of the first inductor switch T1;
the first end 1511 of the first tuning inductor L1 is connected to the second end 1212 of the first matching sub-circuit 121, the second end 1512 of the first tuning inductor L1 is connected to the first end 1522 of the first inductor switch T1, and the second end 1523 of the first inductor switch T1 is grounded.
Optionally, the connection mode of the first tuning inductor L1 and the inductor switch T1 may also be connected as follows: the first end 1522 of the first inductive switch T1 is connected to the second end 1212 of the first matching sub-circuit 121, the second end 1523 of the first inductive switch T1 is connected to the first end 1511 of the first tuning inductor L1, and the second end 1512 of the first tuning inductor L1 is grounded.
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. 2 is exemplified by a MOS transistor.
Optionally, when the antenna 11 operates in the low frequency mode, the controller 16 controls the first inductive switch T1 to be turned on, and when the antenna 11 operates in the high frequency mode, the controller 16 controls the first inductive switch T1 to be turned off.
In the embodiment of the present invention, when the antenna 11 operates in the low frequency mode, since the M switch paths included in the first tuning switch 13 are turned off, and the M switch paths are equivalent to M capacitors when turned off, energy of higher harmonics may be accumulated at first ends of the M capacitors, and second ends of the M capacitors are grounded, so that the energy of higher harmonics needs to be eliminated by using the first tuning inductor L1.
When the antenna 11 operates in the high-frequency mode, in order to avoid the interference of the first tuning inductor L1 on the high-frequency signal of the antenna, the controller 16 controls the first inductor switch T1 to be turned off, so that the first tuning inductor stops operating.
Specifically, if the first inductive switch T1 is an NMOS transistor, when the antenna 11 operates in the high-frequency mode, the first control terminal 161 of the controller 16 outputs a low-level signal to the first inductive switch T1, so that the first inductive switch T1 is turned off; when the antenna 11 operates in the low frequency mode, the first control terminal 161 of the controller 16 outputs a high level signal to the first inductive switch T1 to turn on the first inductive switch T1.
Optionally, the controller 16 further includes a second control terminal 162, and the second control terminal 162 is connected to the control terminal 130 of the first tuning switch 13;
when the antenna 11 operates in the high frequency mode, the controller 16 controls at least one of the M switching paths of the first tuning switch 13 to be turned on.
In the embodiment of the present invention, the controller 16 can flexibly control the on-states of the M switches of the first tuning switch 13, and can flexibly adjust the frequency of the antenna 11 in the high-frequency mode.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another antenna tuning circuit according to an embodiment of the present invention, and fig. 3 is further optimized based on fig. 2. As shown in fig. 3, the antenna tuning circuit further includes 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. 4, the controller 16 further includes a third control terminal 163, and the third control terminal 163 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 16 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 16 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 second feeding point 113, and the antenna tuning 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 working state of the antenna tuning circuit in the impedance matching state. The matching sub-circuit can be a pi-type matching circuit consisting of an inductor and two capacitors.
Optionally, as shown in fig. 5, the antenna tuning circuit further includes a second tuning inductance module 19, a first end 191 of the second tuning inductance 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 inductance module 19 is grounded.
Since the second feeding point 113 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.
As shown in fig. 6, the controller 16 further includes a fourth control terminal 164, the second tuning inductor module 19 includes a second tuning inductor L2 and a second inductor switch T2, and the fourth control terminal 164 is connected to a control terminal 1921 of the second inductor switch T2.
The first end 1911 of the second tuning inductor L2 is connected to the second end 1712 of the second matching sub-circuit 171, the second end 1912 of the second tuning inductor L2 is connected to the first end 1922 of the second inductive switch T2, and the second end 1923 of the second inductive switch T2 is grounded.
The first terminal 1922 of the second inductive switch T2 is connected to the second terminal 1712 of the second matching sub-circuit 171, the second terminal 1923 of the second inductive switch T2 is connected to the first terminal 1911 of the second tuning inductor L2, and the second terminal 1912 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 MOS field effect transistors, insulated gate double IGBTs, triodes, and other semiconductor switching tubes. The second inductive switch T2 in fig. 6 is exemplified by a MOS transistor.
Referring to fig. 7, fig. 7 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 an antenna tuning 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. The antenna tuning circuit 10 may be any one of fig. 1 to 6.
By implementing the antenna apparatus shown in fig. 7, the first tuning inductance module is added, so that the problem of stray radiation of high-frequency harmonics which may occur when the first tuning switch 13 of the antenna tuning circuit 10 is turned off can be avoided, and the exceeding of the stray radiation harmonics can be improved.
Referring to fig. 8, fig. 8 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 and the terminal body 31 shown in fig. 7, and the terminal body 31 may include other components such as a display, a processor, a memory, and a power supply. The mobile terminal may be a mobile phone. The antenna tuning circuit 10 may be any one of fig. 1 to 6.
By implementing the mobile terminal shown in fig. 8, the first tuning inductance module is added, so that the problem of stray radiation of high-frequency harmonics which may occur when the first tuning switch 13 of the antenna tuning circuit 10 is turned off can be avoided, and the exceeding of the stray radiation harmonics 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 (19)
1. An antenna tuning circuit is characterized by comprising an antenna, a first matching circuit, a first tuning switch, a radio frequency signal transmitter and a first tuning inductance module;
the antenna comprises an antenna radiator, a first feed point and a second 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 second feeding 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 feeding point, a second end of the first matching sub-circuit is connected with a first end of the first switch path, a second end of the first switch path is grounded, 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;
the antenna is excited by a high-voltage electric field, and a signal output end of the radio-frequency signal transmitter is used for outputting a low-frequency radio-frequency signal or a high-frequency radio-frequency signal to the second feed point;
when the radio-frequency signal transmitter outputs the low-frequency radio-frequency signal to the second feeding point, the antenna works in a low-frequency mode, and all the M switch paths included in the first tuning switch are disconnected; the M switch paths are equivalent to M capacitors when being disconnected;
the first tuning inductance module is used for eliminating high-frequency harmonic energy accumulated at the M capacitors when the antenna works in a low-frequency mode.
2. The circuit of claim 1, wherein when the rf signal transmitter outputs the high-frequency rf signal to the second feeding point, the antenna operates in a high-frequency mode, and at least one of the M switch paths of the first tuning switch is turned on.
3. The circuit of claim 2, wherein at least one matching subcircuit connected to at least one of the M switching paths is configured to adjust the impedance of the antenna when the at least one of the M switching paths is conductive.
4. The circuit of claim 1, further comprising a controller, the controller comprising a first control terminal, the first tuning inductance module comprising a first tuning inductance and a first inductance switch, the first control terminal connected to a control terminal of the first inductance switch.
5. The circuit of claim 4,
the first end of the first inductance switch is connected with the second end of the first matching sub-circuit, the second end of the first inductance switch is connected with the first end of the first tuning inductance, and the second end of the first tuning inductance is grounded.
6. The circuit of claim 4,
the first end of the first tuning inductor is connected with the second end of the first matching sub-circuit, the second end of the first tuning inductor is connected with the first end of the first inductive switch, and the second end of the first inductive switch is grounded.
7. The circuit of claim 4, wherein the controller controls the first inductive switch to be turned on when the antenna operates in the low frequency mode and to be turned off when the antenna operates in the high frequency mode.
8. The circuit of claim 4, wherein the controller further comprises a second control terminal, the second control terminal being connected to the control terminal of the first tuning switch;
when the antenna works in a high-frequency mode, the controller controls at least one of the M switch paths of the first tuning switch to be conducted.
9. The circuit of any of claims 4-8, further comprising 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.
10. The circuit of claim 9, wherein the controller further comprises a third control terminal, the third 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.
11. The circuit of claim 10,
when the antenna works in a high-frequency mode, the controller controls at least one switch path in the N switch paths of the second tuning switch to be conducted.
12. The circuit of claim 11,
when at least one of the N switching paths is turned on, at least one matching subcircuit connected with at least one of the N switching paths is used for adjusting the impedance of the antenna.
13. The circuit of claim 9, 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.
14. The circuit of claim 13, wherein the controller further comprises a fourth control terminal, and wherein the second tuning inductor module comprises a second tuning inductor and a second inductor switch, and wherein the fourth control terminal is coupled to the control terminal of the second inductor switch.
15. The circuit of claim 14,
the first end of the second inductance switch is connected with the second end of the second matching sub-circuit, the second end of the second inductance switch is connected with the first end of the second tuning inductance, and the second end of the second tuning inductance is grounded.
16. The circuit of claim 14,
the first end of the second tuning inductor is connected with the second end of the second matching sub-circuit, the second end of the second tuning inductor is connected with the first end of the second inductive switch, and the second end of the second inductive switch is grounded.
17. The circuit of any of claims 10-16, the low frequency radio frequency signal comprising a global system for mobile communications GSM8500 megahertz or GSM900 megahertz; the high frequency radio frequency signal comprises GSM1800 mhz.
18. An antenna device, comprising a power amplifier and the antenna tuning circuit as claimed in any one of claims 1-17, 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.
19. A mobile terminal, characterized in that it comprises a terminal body and an antenna device according to claim 18.
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| CN201711339213.7A CN108183331B (en) | 2017-12-14 | 2017-12-14 | Antenna tuning circuit, antenna device and mobile terminal |
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| CN201711339213.7A CN108183331B (en) | 2017-12-14 | 2017-12-14 | Antenna tuning circuit, antenna device and mobile terminal |
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| US11205834B2 (en) * | 2018-06-26 | 2021-12-21 | Apple Inc. | Electronic device antennas having switchable feed terminals |
| CN109004367B (en) * | 2018-07-27 | 2021-11-23 | 南昌黑鲨科技有限公司 | Broadband antenna device and mobile terminal |
| CN109193183A (en) * | 2018-09-11 | 2019-01-11 | 深圳市思讯通信技术有限公司 | The antenna system of wearable smart machine and wearable smart machine |
| FR3087583B1 (en) * | 2018-10-22 | 2021-07-02 | St Microelectronics Tours Sas | ANTENNA FOR MOBILE COMMUNICATION DEVICES |
| CN110011025B (en) * | 2018-12-29 | 2021-03-26 | 瑞声科技(新加坡)有限公司 | Antenna system and mobile terminal |
| CN109755748B (en) * | 2019-01-21 | 2021-09-14 | 联想(北京)有限公司 | Electronic device |
| CN109950701A (en) * | 2019-03-20 | 2019-06-28 | Oppo广东移动通信有限公司 | Antenna module and mobile terminal |
| CN110224226B (en) * | 2019-04-02 | 2021-09-28 | 西安易朴通讯技术有限公司 | Antenna, antenna control method and device |
| CN112104770B (en) * | 2020-09-04 | 2022-08-05 | Tcl通讯（宁波）有限公司 | Antenna tuning switch controller, communication module and mobile terminal |
| CN113422619B (en) * | 2021-06-18 | 2022-05-27 | 安徽安努奇科技有限公司 | Tuning circuit and communication equipment |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Applicant after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Applicant before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |
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