CN108110423B - Antenna tuning circuit, antenna device and mobile terminal - Google Patents
Antenna tuning circuit, antenna device and mobile terminal Download PDFInfo
- Publication number
- CN108110423B CN108110423B CN201711371309.1A CN201711371309A CN108110423B CN 108110423 B CN108110423 B CN 108110423B CN 201711371309 A CN201711371309 A CN 201711371309A CN 108110423 B CN108110423 B CN 108110423B
- Authority
- CN
- China
- Prior art keywords
- antenna
- switch
- feeding point
- frequency band
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005855 radiation Effects 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 16
- 229920006395 saturated elastomer Polymers 0.000 description 9
- 230000005684 electric field Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
- H01Q1/243—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 with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- 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
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
-
- 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
-
- 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
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/35—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using two or more simultaneously fed points
Abstract
The application discloses antenna tuning circuit and mobile terminal, antenna tuning circuit includes: the antenna comprises an antenna, a first matching circuit, a second matching circuit, a first switch, a second switch and a radio frequency signal transceiver; the antenna comprises a first feeding point, a second feeding point and a third feeding point which are sequentially arranged; the first matching circuit and the first switch are connected between the first feeding point and the ground in series, and the second matching circuit and the second switch are connected between the second feeding point and the ground in series; when the working frequency band is at a low frequency, the radio-frequency signal transmitted by the radio-frequency signal transceiver is transmitted to the antenna radiator through the third feed point, the first switch and the second switch are both switched on, and the frequency band in the third frequency band range is smaller than the frequency band in the second frequency band range. By adopting the embodiment of the application, radiation stray can be inhibited.
Description
Technical Field
The present application relates to the field of electronic technologies, and in particular, to an antenna tuning circuit, an antenna device, and a mobile terminal.
Background
The radiated stray is a most complex and difficult problem in all authentications as a mandatory authentication index of the current electronic equipment (such as a smart phone). Particularly, in a Global System for mobile communication (GSM) frequency band, because GSM itself has high power, strong energy is easily excited instantaneously, so that harmonic waves of radiation stray exceed standards. In practical engineering, the third harmonic of GSM900, the second harmonic of GSM1800, or the third harmonic of GSM1800 exceeds the standard.
For rf signals, the signal we transmit will not only contain the usable signal (e.g., GSM900), but will often contain components at the second harmonic (e.g., 1800GHz), or at the third harmonic (e.g., 2700 GHz). Most of the third harmonic waves in the actual engineering can exceed the standard. When the third harmonic energy of the rf signal reaches the third resonance of the antenna, it radiates the unwanted harmonic energy, resulting in spurious emissions.
Disclosure of Invention
The embodiment of the application provides an antenna tuning circuit and a mobile terminal, which are used for eliminating the condition that a tuning switch is saturated due to the high voltage of a feed point when the antenna tuning circuit works at a low frequency, and further suppressing radiation stray.
In a first aspect, an embodiment of the present application provides an antenna tuning circuit, including an antenna, a first matching circuit, a second matching circuit, a first switch, a second switch, and a radio frequency signal transceiver;
the antenna comprises a first feeding point, a second feeding point and a third feeding point which are sequentially arranged; the first matching circuit and the first switch are connected between the first feeding point and the ground in series, and the second matching circuit and the second switch are connected between the second feeding point and the ground in series;
when the working frequency band is in a first frequency band range, the radio-frequency signal transmitted by the radio-frequency signal transceiver is transmitted to the antenna radiator through the first feed point, the second switch is switched on, and the first switch is switched off or switched on;
when the working frequency band is in a second frequency band range, the radio-frequency signal transmitted by the radio-frequency signal transceiver is transmitted to the antenna radiator through the first feed point, the first switch is turned on, the second switch is turned off, and the frequency band in the second frequency band range is smaller than the frequency band in the first frequency band range;
when the working frequency band is in a third frequency band range, the radio-frequency signal transmitted by the radio-frequency signal transceiver is transmitted to the antenna radiator through the third feeding point, the first switch and the second switch are both conducted, and the frequency band in the third frequency band range is smaller than the frequency band in the second frequency band range.
In a second aspect, an embodiment of the present application provides an antenna apparatus, including a power amplifier and the antenna tuning circuit provided in the first aspect, where the power amplifier is configured to amplify a radio frequency signal sent by the radio frequency signal transceiver and output the amplified radio frequency signal to the antenna.
In a third aspect, an embodiment of the present application provides a mobile terminal, which includes a terminal body and the antenna apparatus provided in the first aspect.
It can be seen that, in the embodiment of the present application, a low-frequency feeding point (i.e. a third feeding point) is added, and in low-frequency operation, a radio frequency signal transmitted by a radio frequency signal transmitter directly radiates low-frequency energy through the low-frequency feeding point and an antenna body, so that a situation that a tuning switch is saturated due to a high voltage of the feeding point in low-frequency operation is eliminated, and further radiation stray is suppressed.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
Fig. 1 is a schematic diagram of a tuning circuit of a slot antenna according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an antenna tuning circuit according to an embodiment of the present application;
fig. 3 is a partial schematic diagram of an antenna tuning circuit according to an embodiment of the present application;
fig. 4 is a partial schematic diagram of another antenna tuning circuit provided in an embodiment of the present application;
fig. 5 is a partial schematic diagram of another antenna tuning circuit provided in an embodiment of the present application;
fig. 6 is a partial schematic diagram of another antenna tuning circuit provided in an embodiment of the present application;
fig. 7 is a partial schematic diagram of another antenna tuning circuit provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram of an antenna device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a mobile terminal according to an embodiment of the present application.
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.
The Mobile terminal according to the embodiment 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 the like, which have wireless communication functions. For convenience of description, the above-mentioned devices are collectively referred to as a mobile terminal.
Fig. 1 is a schematic diagram of a tuning circuit of a slot antenna provided in an embodiment of the present application, and referring to fig. 1, the antenna tuning circuit includes an antenna, a ground feeding point, a main feeding point, two tuning switches, and two matching circuits. Two tuning switches connected with the ground feeding point and the main feeding point are mainly used for adjusting medium and high frequency. The working principle of the tuning circuit of the slot antenna is mainly to realize the switching of different frequency bands through two tuning switches and two matching circuits.
As shown in fig. 1, the main feeding point is grounded through the tuning switch, and when the antenna works at a medium-high frequency (if the frequency band supported by the size of the antenna itself is GSM900 mhz, the medium-high frequency refers to a frequency band greater than GSM900 mhz, such as GSM1800 mhz, GSM1900 mhz, etc., and if the frequency band supported by the size of the antenna itself is GSM1800 mhz, the medium-high frequency refers to a frequency band greater than GSM1800 mhz, such as GSM1900 mhz, etc.), the antenna works at the medium-high frequency through the matching circuit and the tuning switch by switching to the matching corresponding to the medium-high frequency, so that the antenna works at the medium-high frequency, and the medium-high frequency energy is radiated. When the low frequency (if the frequency band supported by the size of the antenna is GSM900 mhz, the low frequency refers to the frequency band less than or equal to GSM900 mhz, and if the frequency band supported by the size of the antenna is GSM1800, the high frequency refers to the frequency band less than or equal to GSM1800 mhz) works, since the size of the antenna is designed in the low frequency band, the tuning switch at the main feeding point is not needed, and the low frequency energy is directly conducted and then radiated from the main feeding point. For the slot antenna, when the slot antenna works at a low frequency, the main feed point radiates low-frequency energy in a mode of intense electric field, so that a strong voltage signal can be generated at the main feed point, and the tuning switch of the main feed point is saturated due to high voltage, so that radiation stray exceeds the standard.
In view of the above problem, referring to fig. 2, an embodiment of the present application provides a schematic diagram of an antenna tuning circuit, where the antenna tuning circuit includes: the antenna 10, the first matching circuit 20, the second matching circuit 30, the first switch 40, the second switch 50 and the radio frequency signal transceiver 60;
the antenna 10 includes a first feeding point 11, a second feeding point 12 and a third feeding point 13 arranged in sequence; the first matching circuit 20 and the first switch 40 are connected in series between the first feeding point 11 and the ground, and the second matching circuit 30 and the second switch 50 are connected in series between the second feeding point 12 and the ground;
when the working frequency band is in the first frequency band range, the radio frequency signal transmitted by the radio frequency signal transceiver 60 is transmitted to the antenna 10 through the first feeding point 11, the second switch 50 is turned on, and the first switch 40 is turned off or turned on;
when the working frequency band is in the second frequency band range, the radio frequency signal transmitted by the radio frequency signal transceiver 60 is transmitted to the antenna 10 through the first feeding point 11, the first switch 40 is turned on, the second switch 50 is turned off, and the frequency band in the second frequency band range is smaller than the frequency band in the first frequency band range;
when the working frequency band is in the third frequency band range, the rf signal transmitted by the rf signal transceiver 60 is transmitted to the antenna 10 through the third feeding point 13, the first switch 40 and the second switch 50 are both turned on, and the frequency band in the third frequency band range is smaller than the frequency band in the second frequency band range.
The frequency band in the third frequency band range may be less than or equal to GSM850 mhz, less than or equal to GSM900 mhz, or less than or equal to GSM1800 mhz, and the like, which are not limited herein.
The frequency band in the second frequency band range may be a frequency band around GSM850 mhz, a frequency band around GSM900 mhz, a frequency band around GSM1800 mhz, and the like, and is not limited herein.
The frequency band in the first frequency band range may be a frequency band around GSM1700 mhz and greater than GSM1700 mhz, or a frequency band around GSM1800 mhz and greater than GSM1800 mhz, and the like, and is not limited herein.
The rf signal transceiver 60 is used as an original signal source, and the frequency band of the rf signal is usually one or more of 850 mhz, 900 mhz, 1800 mhz, 1900 mhz, and the like. The mobile terminal can automatically switch frequencies within the frequency ranges according to the network coverage condition so as to ensure the optimal use effect.
The antenna 10 is a converter which converts a guided wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium (usually free space) or vice versa. An antenna is a component for transmitting or receiving electromagnetic waves in a mobile terminal. Engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasure, remote sensing, radio astronomy and the like all use electromagnetic waves to transmit information and work by depending on antennas. In addition, in transferring energy with electromagnetic waves, non-signal energy radiation also requires antennas. The antennas are generally reversible, i.e., the same antenna can be used as both a transmit antenna and a receive antenna. The same antenna is the same as the basic characteristic parameter for transmission or reception.
The first switch 40 and the second switch 50 are tuning switches.
In an embodiment of the present application, the first feeding point 12 is a main feeding point, the second feeding point 13 is a ground feeding point, and the third feeding point 14 is a low frequency feeding point.
In an embodiment of the present application, as shown in fig. 2, the first feeding point 12 is disposed at the first end of the antenna radiator 11, the third feeding point 14 is disposed at the second end of the antenna radiator 11, and the second feeding point 13 is disposed between the first feeding point 12 and the third feeding point 14.
Specifically, under the low-frequency operation, the voltage decreases gradually from the third feeding point 13 to the other end (i.e., the first feeding point) of the antenna radiator, so that the tuning switches (i.e., the first tuning switch and the second tuning switch) are far away from the high voltage, and radiation stray caused by saturation of the tuning switches is further avoided.
It can be seen that, in the embodiment of the present application, a low frequency feeding point (i.e. a third feeding point) is added, and in low frequency operation, a radio frequency signal transmitted by a radio frequency signal transceiver directly radiates low frequency energy through the low frequency feeding point and an antenna, so as to eliminate a situation that a tuning switch is saturated due to a high voltage at the feeding point during low frequency operation, thereby suppressing radiation stray.
In an embodiment of the present application, the first matching circuit 20 is connected to the first switch 40, and the first matching circuit 20 is connected to the antenna 10 through the first feeding point 11; the second matching circuit 30 is connected to the second switch 50, and the second matching circuit 30 is connected to the antenna 10 through the second feeding point 12. As shown in particular in fig. 2.
In an embodiment of the present application, the first matching circuit 20 is connected to the first switch 40, and the first switch 40 is connected to the antenna 10 through the first feeding point 11; the second matching circuit 30 is connected to the second switch 50, and the second switch 50 is connected to the antenna 10 through the second feeding point 12. As shown in particular in figure 3.
In an embodiment of the present application, the first matching circuit 20 includes M matching sub-circuits, and the second matching circuit 30 includes N matching sub-circuits, where M and N are positive integers.
In an embodiment of the present application, when the operating frequency band is within the first frequency band range, at least one matching sub-circuit of the N matching sub-circuits is turned on; or at least one of the N matching sub-circuits is turned on and at least one of the M matching sub-circuits is turned on.
In an embodiment of the application, when the operating frequency band is in the second frequency band range, at least one matching sub-circuit of the M matching sub-circuits is turned on.
In an embodiment of the application, when the operating frequency band is in the third frequency band range, at least one of the N matching sub-circuits is turned on and at least one of the M matching sub-circuits is turned on.
It should be noted that, when the at least one matching subcircuit is turned on, the at least one matching subcircuit is connected to the antenna to adjust the impedance of the antenna, so that the impedance of the antenna is matched with the impedance of the feed line at the feed point, and the antenna tuning circuit operates in the impedance matching state. The matching sub-circuit can adjust the working frequency of the antenna under high frequency and adjust the antenna tuning circuit to be in an impedance matching state.
In addition, the matching sub-circuit may be a single element, such as an inductor or a capacitor, or may be a pi-type matching circuit composed of an inductor and two capacitors, or may be a complex structure, such as a frequency gating circuit, or may be other circuits having similar functions, which are not listed. The frequency gating circuit can be equivalent to a short circuit in a low frequency band and equivalent to an inductor or a capacitor in a high frequency band. In addition, the impedance of different matching sub-circuits is different. Specifically, please refer to fig. 4 for a structure of the matching sub-circuit, and fig. 4 is a partial schematic diagram of an antenna tuning circuit according to an embodiment of the present disclosure.
In an embodiment of the present application, the matching sub-circuit of the first matching circuit 20 is a GSM850 mhz or 900 mhz band matching sub-circuit, and the matching sub-circuit of the second matching circuit 30 is a GSM1800 mhz band matching sub-circuit.
In an embodiment of the present application, the third feeding point 13 is disposed at one end of the antenna 10, and the distance between the third feeding point 13 and the first feeding point 11 and the second feeding point 12 is greater than or equal to a set distance.
Specifically, since the third feeding point 13 radiates low-frequency energy in a manner of intense electric field during low-frequency operation, and thus there is a very strong voltage signal at the third feeding point 13, the first feeding point 11 and the second feeding point 12 need to be kept at a certain distance from the third feeding point 13 in order to avoid the first switch 40 and the second switch 50 being saturated due to high voltage.
The set distance is a condition that the first switch and the second switch are not saturated when the distance between the third feeding point 13 and the first feeding point 11 and the second feeding point 12 is greater than or equal to the value, which is obtained through a plurality of tests by research personnel. The set distance is less than the length of the antenna 10.
In an embodiment of the present application, the antenna tuning circuit further includes a first filter 80 and/or a second filter 90, the first filter 80 is connected in series between the matching sub-circuit of the first matching circuit 20 and the first switch 40, and the second filter 90 is connected in series between the matching sub-circuit of the second matching circuit 30 and the second switch 50, and the filters are configured to retain the main frequency signals of the corresponding frequency band and filter the harmonics generated by the tuning switches.
Further, the antenna tuning circuit further includes a first filter 80 and a second filter 90 at a distance from the first feeding point 11 and the second feeding point 12 that is less than the set distance at the third feeding point 13.
Further, the antenna tuning circuit further comprises a first filter 80 at a distance from the third feeding point 13 to the first feeding point 11 that is smaller than the set distance.
Further, the antenna tuning circuit further comprises a second filter 90 at a distance between the third feeding point 13 and the second feeding point 12 that is smaller than the set distance.
The first filter and the second filter are low-pass filters.
Specifically, please refer to fig. 5, wherein fig. 5 is a schematic diagram of an antenna tuning circuit according to an embodiment of the present disclosure. Since the third feeding point 13 radiates low-frequency energy in a manner of intense electric field during low-frequency operation, a voltage signal with a very strong intensity is generated at the third feeding point 13. In the case that the distances between the third feeding point 13 and the first feeding point 11 and the second feeding point 12 are both less than the set distance, there may be a problem that the strong voltage signal generated by the third feeding point 13 still has a strong voltage signal when reaching the second feeding point 12 and the first feeding point 11, which may cause the first switch 40 and the second switch 50 to be saturated and generate radiation spurs, so to avoid this, a low-pass filter is connected in series to each of the matching sub-circuit of the first matching circuit 20 and the matching sub-circuit of the second matching circuit 30, so that even if harmonics are generated at the tuning switch, the filter can filter out and further solve the problem of radiation spurs.
Referring to fig. 6, fig. 6 is a schematic diagram of an antenna tuning circuit according to an embodiment of the present disclosure. Since the third feeding point 13 radiates low-frequency energy in a manner of intense electric field during low-frequency operation, a voltage signal with a very strong intensity is generated at the third feeding point 13. In the case that the distances between the third feeding point 13 and the first feeding point 11 are both less than the set distance, there may be a problem that the strong voltage signal generated by the third feeding point 13 still has a strong voltage signal when reaching the first feeding point 11, which may cause the first switch 40 to be saturated and generate radiation spurs, so to avoid this, a low-pass filter is connected in series with the matching sub-circuit of the first matching circuit 20, so that even if harmonics are generated at the tuning switch, the filter can filter out the harmonics, and further solve the problem of radiation spurs.
Referring to fig. 7, fig. 7 is a schematic diagram of an antenna tuning circuit according to an embodiment of the present disclosure. Since the third feeding point 13 radiates low-frequency energy in a manner of intense electric field during low-frequency operation, a voltage signal with a very strong intensity is generated at the third feeding point 13. In the case that the distances between the third feeding point 13 and the second feeding point 12 are both smaller than the set distance, there may be a problem that the strong voltage signal generated by the third feeding point 13 still has a strong voltage signal when reaching the second feeding point 12, which may cause the second switch 50 to be saturated and generate radiation spurs, and therefore, in order to avoid this, a low-pass filter is connected in series with the matching sub-circuit of the second matching circuit 30, so that even if harmonics are generated at the tuning switch, the filter can filter out the harmonics, and further solve the problem of radiation spurs.
In an embodiment of the present application, the tuning switch is any one of single-pole double-throw, single-pole triple-throw, and single-pole quadruplet.
In an embodiment of the present application, the antenna tuning circuit further includes a control module 70, the first tuning switch 40 and the second tuning switch 50 are connected to the control module 70, and the first tuning switch 40 and the second tuning switch 50 are configured to select the corresponding matching sub-circuit based on a switch logic control signal received from the control module 70.
Referring to fig. 8, fig. 8 is a schematic diagram of an antenna apparatus according to an embodiment of the present application, where the antenna apparatus includes a power amplifier and the antenna tuning circuit according to the foregoing embodiments, and the power amplifier is configured to amplify a radio frequency signal transmitted by a radio frequency signal transceiver and output the amplified radio frequency signal to an antenna.
As shown in fig. 8, the antenna device provided in the embodiments of the present application includes the antenna tuning circuit described in the above embodiments, so that the antenna device also has the same advantageous effects as the antenna tuning circuit.
The antenna tuning circuit provided by any embodiment of the application can be executed by the product, and the antenna tuning circuit has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the antenna tuning circuit provided in any embodiment of the present application.
Referring to fig. 9, fig. 9 is a mobile terminal according to an embodiment of the present application, where the mobile terminal includes a main board ground and the antenna device, and the antenna device is connected to the main board ground.
As shown in fig. 9, the mobile terminal provided in the embodiment of the present application includes the antenna device including the antenna tuning circuit described in the foregoing embodiments, so that the mobile terminal also has the same beneficial effects as the antenna tuning circuit. It should be noted that the mobile terminal further includes other components supporting normal operation of the mobile terminal, for example, a touch display screen, a processor, a memory, and the like.
The antenna tuning circuit provided by any embodiment of the application can be executed by the product, and the antenna tuning circuit has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the antenna tuning circuit provided in any embodiment of the present application.
It should be noted that the above description is only a preferred embodiment of the present application and the technical principles applied. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims (18)
1. An antenna tuning circuit is characterized by comprising an antenna, a first matching circuit, a second matching circuit, a first switch, a second switch and a radio frequency signal transceiver;
the antenna comprises a first feeding point, a second feeding point and a third feeding point which are sequentially arranged; the first matching circuit and the first switch are connected between the first feeding point and the ground in series, and the second matching circuit and the second switch are connected between the second feeding point and the ground in series;
when the working frequency band is in a first frequency band range, the radio-frequency signal transmitted by the radio-frequency signal transceiver is transmitted to the antenna through the first feeding point, the second switch is switched on, and the first switch is switched off or switched on;
when the working frequency band is in a second frequency band range, the radio-frequency signal transmitted by the radio-frequency signal transceiver is transmitted to the antenna through the first feeding point, the first switch is switched on, the second switch is switched off, and the frequency band in the second frequency band range is smaller than the frequency band in the first frequency band range;
when the working frequency band is in a third frequency band range, the radio-frequency signal transmitted by the radio-frequency signal transceiver is transmitted to the antenna through the third feeding point, the first switch and the second switch are both switched on, and the frequency band in the third frequency band range is smaller than the frequency band in the second frequency band range;
the antenna tuning circuit further includes a first filter when the distance between the third feeding point and the first feeding point is smaller than a set distance, or the antenna tuning circuit further includes a second filter when the distance between the third feeding point and the second feeding point is smaller than the set distance, where the set distance is a distance at which the first switch and the second switch do not saturate when the distance between the third feeding point and the first feeding point or the second feeding point is greater than or equal to the set distance.
2. The antenna tuning circuit of claim 1, wherein the first matching circuit is connected to the first switch, and wherein the first matching circuit is connected to the antenna through the first feed point; the second matching circuit is connected with the second switch, and the second matching circuit is connected with the antenna through the second feeding point.
3. The antenna tuning circuit of claim 1, wherein the first matching circuit is connected to the first switch, and wherein the first switch is connected to the antenna through the first feed point; the second matching circuit is connected to the second switch, and the second switch is connected to the antenna through the second feeding point.
4. The antenna tuning circuit of claim 1, wherein the first matching circuit comprises M matching sub-circuits, wherein the second matching circuit comprises N matching sub-circuits, and wherein M and N are positive integers.
5. The antenna tuning circuit of claim 4, wherein at least one of the N matching sub-circuits is turned on when an operating frequency band is in the first frequency band range; or at least one of the N matching sub-circuits is turned on and at least one of the M matching sub-circuits is turned on.
6. The antenna tuning circuit of claim 4 or 5, wherein at least one of the M matching sub-circuits is turned on when the operating frequency band is in the second frequency band range.
7. The antenna tuning circuit of any of claims 4-5, wherein at least one of the N matching sub-circuits is turned on and at least one of the M matching sub-circuits is turned on when the operating frequency band is in the third frequency band range.
8. The antenna tuning circuit according to any of claims 4-5, wherein the matching subcircuit is a pi-type matching circuit consisting of one inductance and two capacitances.
9. The antenna tuning circuit of any of claims 4-5, wherein the matching sub-circuit consists of a single capacitance or a single inductance.
10. An antenna tuning circuit according to any of claims 4-5, characterized in that the impedance of the different matching sub-circuits is different.
11. The antenna tuning circuit of any of claims 1-5, wherein the first feed point is disposed at a first end of the antenna and the third feed point is disposed at a second end of the antenna.
12. The antenna tuning circuit of any of claims 1-5, wherein the third feeding point is placed at an end point of the antenna, and wherein the distance between the third feeding point and the first feeding point and the second feeding point is greater than or equal to a set distance.
13. The antenna tuning circuit according to any of claims 1-5, wherein the first filter is connected in series between the matching sub-circuit of the first matching circuit and the first switch, and the second filter is connected in series between the matching sub-circuit of the second matching circuit and the second switch, and the first filter and the second filter are configured to retain the main frequency signals of the corresponding frequency band and filter the harmonics generated by the switches.
14. The antenna tuning circuit of claim 13, wherein the antenna tuning circuit comprises both the first filter and the second filter when the third feed point is less than a set distance from the first feed point and the second feed point.
15. The antenna tuning circuit of any of claims 1-5, wherein the switch is any of single-pole double-throw, single-pole triple-throw, and single-pole quadruplet.
16. The antenna tuning circuit according to any of claims 1-5, further comprising a control module, wherein the switch is connected to the control module, and wherein the switch is configured to select the corresponding matching sub-circuit based on a switch logic control signal received from the control module.
17. An antenna device, comprising a power amplifier and the antenna tuning circuit as claimed in any one of claims 1 to 16, wherein the power amplifier is configured to amplify the rf signal transmitted by the rf signal transceiver and output the amplified rf signal to the antenna.
18. A mobile terminal, characterized in that the mobile terminal comprises a motherboard ground and an antenna device according to claim 17, which antenna device is connected to the motherboard ground.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711371309.1A CN108110423B (en) | 2017-12-14 | 2017-12-14 | Antenna tuning circuit, antenna device and mobile terminal |
| PCT/CN2018/119757 WO2019114622A1 (en) | 2017-12-14 | 2018-12-07 | Antenna tuning circuit, antena apparatus and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711371309.1A CN108110423B (en) | 2017-12-14 | 2017-12-14 | Antenna tuning circuit, antenna device and mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108110423A CN108110423A (en) | 2018-06-01 |
| CN108110423B true CN108110423B (en) | 2020-03-10 |
Family
ID=62211024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711371309.1A Expired - Fee Related CN108110423B (en) | 2017-12-14 | 2017-12-14 | Antenna tuning circuit, antenna device and mobile terminal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108110423B (en) |
| WO (1) | WO2019114622A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110423B (en) * | 2017-12-14 | 2020-03-10 | Oppo广东移动通信有限公司 | Antenna tuning circuit, antenna device and mobile terminal |
| CN110718761B (en) | 2018-07-11 | 2021-11-09 | 华为技术有限公司 | Antenna device and mobile terminal |
| CN112350054B (en) * | 2019-08-09 | 2022-12-13 | 青岛海信移动通信技术股份有限公司 | Mobile terminal |
| CN110444885A (en) * | 2019-08-28 | 2019-11-12 | Oppo（重庆）智能科技有限公司 | A kind of antenna module, mobile phone, control method and electronic equipment |
| CN110970706B (en) * | 2019-11-20 | 2021-04-09 | 珠海格力电器股份有限公司 | Multimode antenna, terminal, communication method and device of multimode antenna and processor |
| CN112882375A (en) * | 2019-11-29 | 2021-06-01 | RealMe重庆移动通信有限公司 | Wearable electronic equipment |
| CN114122683B (en) * | 2020-08-28 | 2022-12-30 | 华为技术有限公司 | Antenna system and electronic device |
| CN112397902B (en) * | 2020-10-23 | 2023-06-20 | Oppo广东移动通信有限公司 | Antenna, impedance matching method thereof and terminal |
| CN115118302B (en) * | 2021-03-23 | 2023-11-10 | Oppo广东移动通信有限公司 | Antenna device and electronic equipment |
| CN113471696B (en) * | 2021-07-20 | 2023-01-31 | 南昌黑鲨科技有限公司 | Antenna |
| CN115548683A (en) * | 2022-09-23 | 2022-12-30 | 维沃移动通信有限公司 | Antenna module and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794871A (en) * | 2014-01-23 | 2014-05-14 | 华为终端有限公司 | Antenna system and terminal |
| CN105633555A (en) * | 2016-01-25 | 2016-06-01 | 宇龙计算机通信科技(深圳)有限公司 | Antenna switching assembly, switching method, switching system, antenna and mobile terminal |
| CN206148617U (en) * | 2016-10-24 | 2017-05-03 | 广东欧珀移动通信有限公司 | Antenna device and mobile terminal |
| CN107317112A (en) * | 2017-06-22 | 2017-11-03 | 维沃移动通信有限公司 | A kind of antenna circuit and mobile terminal |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101318575B1 (en) * | 2011-11-16 | 2013-10-16 | 주식회사 팬택 | Mobile terminal having antenna for tunning resonance frequency band and operating method there of |
| US9496608B2 (en) * | 2013-04-17 | 2016-11-15 | Apple Inc. | Tunable multiband antenna with passive and active circuitry |
| GB2537676B (en) * | 2015-04-24 | 2018-09-19 | Smart Antenna Tech Limited | Switch architecture for antenna matching circuits |
| CN108134202B (en) * | 2017-12-14 | 2020-03-10 | Oppo广东移动通信有限公司 | Antenna tuning circuit and mobile terminal |
| CN108110423B (en) * | 2017-12-14 | 2020-03-10 | Oppo广东移动通信有限公司 | Antenna tuning circuit, antenna device and mobile terminal |
-
2017
- 2017-12-14 CN CN201711371309.1A patent/CN108110423B/en not_active Expired - Fee Related
-
2018
- 2018-12-07 WO PCT/CN2018/119757 patent/WO2019114622A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794871A (en) * | 2014-01-23 | 2014-05-14 | 华为终端有限公司 | Antenna system and terminal |
| CN105633555A (en) * | 2016-01-25 | 2016-06-01 | 宇龙计算机通信科技(深圳)有限公司 | Antenna switching assembly, switching method, switching system, antenna and mobile terminal |
| CN206148617U (en) * | 2016-10-24 | 2017-05-03 | 广东欧珀移动通信有限公司 | Antenna device and mobile terminal |
| CN107317112A (en) * | 2017-06-22 | 2017-11-03 | 维沃移动通信有限公司 | A kind of antenna circuit and mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108110423A (en) | 2018-06-01 |
| WO2019114622A1 (en) | 2019-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108110423B (en) | Antenna tuning circuit, antenna device and mobile terminal | |
| CN108134202B (en) | Antenna tuning circuit and mobile terminal | |
| TWI662747B (en) | Electronic device and its antenna with multiple feed points | |
| CN108183331B (en) | Antenna tuning circuit, antenna device and mobile terminal | |
| US9385427B2 (en) | Multi-band antenna and wireless communication device employing same | |
| Valkonen et al. | Capacitive coupling element antennas for multi-standard mobile handsets | |
| CN109088151B (en) | Antenna system and mobile terminal | |
| US10833413B2 (en) | Communication device | |
| US20140273887A1 (en) | Tunable ila and dila matching for simultaneous high and low band operation | |
| CN108111180B (en) | Tuning switch control circuit, antenna device and mobile terminal | |
| US9374126B2 (en) | Multiband on ground antenna with a dual radiator arrangement | |
| US9620850B2 (en) | Wireless communication device | |
| US9077388B2 (en) | System for near field communication (NFC) and frequency modulation (FM) communication and portable electronic device using the same | |
| CA2898060C (en) | Mobile wireless communications device with improved broadband antenna impedance matching | |
| CN103022637B (en) | A kind of built-in aerial, the mobile terminal of built-in aerial and communication means thereof | |
| US20130225234A1 (en) | Mobile device and wideband antenna structure therein | |
| US9509047B2 (en) | Self-configurable resonance antenna | |
| CN108063307B (en) | Antenna tuning circuit and mobile terminal | |
| CN106207375A (en) | A kind of electronic equipment | |
| TWI594589B (en) | Rf matching circuit and wireless communication device using same | |
| CN110708080B (en) | Communication device | |
| US9419337B2 (en) | Wireless communication device | |
| US9819077B1 (en) | Multi-feed antenna optimized for non-50 Ohm operation | |
| EP2677666A1 (en) | Dual mode mobile terminal | |
| US9425508B2 (en) | Antenna structure and wireless communication device using same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
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. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200310 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |