WO2015109943A1 - 一种天线系统以及终端 - Google Patents

一种天线系统以及终端 Download PDF

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Publication number
WO2015109943A1
WO2015109943A1 PCT/CN2015/070283 CN2015070283W WO2015109943A1 WO 2015109943 A1 WO2015109943 A1 WO 2015109943A1 CN 2015070283 W CN2015070283 W CN 2015070283W WO 2015109943 A1 WO2015109943 A1 WO 2015109943A1
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WO
WIPO (PCT)
Prior art keywords
filter
antenna
frequency band
antenna body
adjustable device
Prior art date
Application number
PCT/CN2015/070283
Other languages
English (en)
French (fr)
Inventor
张学飞
王磊
冯堃
刘池
Original Assignee
华为终端有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to US15/113,407 priority Critical patent/US10411354B2/en
Publication of WO2015109943A1 publication Critical patent/WO2015109943A1/zh
Priority to US16/528,919 priority patent/US11949172B2/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • 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
    • 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
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates to the field of antennas, and more particularly to an antenna system and a terminal.
  • the antenna bandwidth of the terminal product needs to cover more frequency bands.
  • the space occupied by the antenna is required to be as small as possible, while the miniaturization and wideband are contradictory. Therefore, in this context, the tunable antenna becomes a contradiction problem.
  • the so-called tunable antenna is to load different inductance and capacitance components in the "sensitive position" of the antenna or to change the connection and disconnection, thereby changing the impedance characteristics of the antenna.
  • the above-mentioned "sensitive position" mainly includes an excitation point of an antenna, a grounding point, or an antenna body wiring.
  • an adjustable device such as a switching device is connected in series at the grounding point of the antenna, and the back end of the switching device is connected with an inductor or a capacitor of different inductance or capacitance, and then connected to the ground.
  • the series of adjustable devices can be switched between “multiple inductors or capacitors or through to ground” according to the requirements of the antenna design, as the switch is switched, the devices connected to the ground point are different, which will affect the excitation.
  • the impedance characteristics at the point can be used to change the working frequency band of the antenna.
  • the sum of the coverable bands is the total bandwidth that the tunable antenna can eventually cover.
  • tunable devices in the prior art extends the bandwidth of the antenna's low frequency, but when the tunable device is switched or changed, although the low frequency operating band of the antenna changes as expected, each tunable device switches or changes. After that, or in each operating state of the tunable device, the frequency response characteristics of the antenna in the high frequency band will also change accordingly, and the high frequency changes are often irregular.
  • the object of the present invention is to solve the problem that the high-frequency impedance is implicated and disorderly changed when tuning for a low-frequency bandwidth, and the technical solution is as follows:
  • a first aspect of the present application provides an antenna system, the antenna system comprising:
  • An antenna body an adjustable device, a first filter and/or a second filter
  • the antenna body is connected to the adjustable device
  • the first filter is in parallel with the tunable device, and the first filter is presented at a low frequency band High impedance characteristics, low impedance characteristics at high frequencies;
  • the second filter is connected in series between the antenna body and the adjustable device, the first end of the second filter is connected to the antenna body, and the second end of the second filter is The tunable device is connected, and the second filter exhibits a low impedance characteristic in a low frequency band and a high impedance characteristic in a high frequency band.
  • the antenna system includes the antenna body, the adjustable device, the first filter, and a parasitic unit;
  • the adjustable device is connected to the antenna body through the parasitic unit;
  • the first end of the first filter is connected to the antenna body through the parasitic unit.
  • the antenna system includes the antenna body, the adjustable device, the second filter, and a parasitic unit;
  • the first end of the second filter is connected to the antenna body through the parasitic unit;
  • the adjustable device is sequentially connected to the antenna body through the second filter and the parasitic unit.
  • the antenna system includes the antenna body, the adjustable device, the first filter, the second filter, and a parasitic unit;
  • the first end of the first filter is connected to the antenna body through the parasitic unit;
  • the first end of the second filter is connected to the antenna body through the parasitic unit;
  • the adjustable device is sequentially connected to the antenna body through the second filter and the parasitic unit.
  • the first filter is a single capacitor, or an LC network composed of an inductor and a capacitor.
  • the second filter is a single inductor, or an LC network composed of an inductor and a capacitor.
  • the antenna body is an IFA antenna, or a Monopole antenna.
  • a second aspect of the present application provides a terminal, the terminal comprising an antenna system, the antenna system comprising an antenna body, an adjustable device, a first filter and/or a second filter;
  • the antenna body is connected to the adjustable device
  • the first filter is connected in parallel with the tunable device, the first filter exhibiting high impedance characteristics in a low frequency band and low impedance characteristics in a high frequency band;
  • the second filter is connected in series between the antenna body and the adjustable device, the first end of the second filter is connected to the antenna body, and the second end of the second filter is The tunable device is connected, and the second filter exhibits a low impedance characteristic in a low frequency band and a high impedance characteristic in a high frequency band.
  • the antenna system includes the antenna body, the adjustable device, the first filter, and a parasitic unit;
  • the adjustable device is connected to the antenna body through the parasitic unit;
  • the first end of the first filter is connected to the antenna body through the parasitic unit.
  • the antenna system includes the antenna body, the adjustable device, the second filter, and a parasitic unit;
  • the first end of the second filter is connected to the antenna body through the parasitic unit;
  • the adjustable device is sequentially connected to the antenna body through the second filter and the parasitic unit.
  • the antenna system includes the antenna body, the adjustable device, the first filter, the second filter, and a parasitic unit;
  • the first end of the first filter is connected to the antenna body through the parasitic unit;
  • the first end of the second filter is connected to the antenna body through the parasitic unit;
  • the adjustable device is sequentially connected to the antenna body through the second filter and the parasitic unit.
  • the first filter is a single capacitor, or an LC network composed of an inductor and a capacitor.
  • the second filter is a single inductor, or an LC network composed of an inductor and a capacitor.
  • the antenna body is an IFA antenna, or a Monopole antenna.
  • the first filter exhibits high impedance in the low frequency band, low impedance in the high frequency band, and is coupled to the bypass of the adjustable device, so when the antenna operates in the low frequency band, the RF current at the grounding point is affected by the filter.
  • High-impedance barriers can only be circulated from the tunable device branch.
  • the RF current is mainly connected from the filter branch to the ground point because the filter exhibits low impedance, which is equivalent to straight-through to ground. At this time, even if the state of the adjustable device branch changes, the disturbance to the high-frequency current will be small, thereby ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • a second filter may be provided.
  • the second filter exhibits low impedance in a low frequency band and high impedance in a high frequency band, and is connected in series between the antenna body and the adjustable device, so when the antenna operates in a low frequency band, The RF current at the grounding point is not affected by the filter and is directly connected to the adjustable device.
  • the high-impedance characteristic of the filter blocks the RF current from connecting to the adjustable device. In the open state, the state change of the adjustable device will not affect the current flow at the antenna ground point, ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • the first filter and the second filter may be simultaneously set.
  • the second filter exhibits low impedance in a low frequency band and high impedance in a high frequency band, and is connected in series between the antenna body and the tunable device, the first filter exhibiting high impedance in a low frequency band and low impedance in a high frequency band, and And connected to the bypass of the second filter and the adjustable device series path. Therefore, when the antenna operates in the low frequency band, the RF current at the grounding point is blocked by the high impedance of the first filter, and can only flow from the series path formed by the second filter and the tunable device, and the second filter is presented at a low frequency. Low impedance, so the RF current is not affected by the second filter and is directly connected to the tunable device.
  • the RF current is mainly connected from the first filter branch to the ground point, and the second filter exhibits a high
  • the impedance blocking the RF current to the adjustable device, further ensures that the RF current can only be connected from the first filter branch to the ground point.
  • the adjustable device branch changes state, the high frequency current is disturbed. It will be small, thus ensuring that the change of the tunable device is only applied to the low frequency band, and the influence on the high frequency is greatly reduced.
  • each state of the tunable device corresponds to a frequency band covering the antenna.
  • the performance at other frequencies can be neglected, that is, if the antenna Currently working in the low frequency band, the performance of the antenna in the high frequency band is negligible. Because the entire terminal only works in the low frequency band.
  • the terminal system can work in both low and high frequency bands. Since the terminal system needs to increase the bandwidth of the wireless network by increasing the spectrum width, the antenna needs to be at the specified low frequency and high. The frequency band maintains good performance at the same time.
  • the current antenna system uses a state of an adjustable device to make the antenna exhibit good performance at both low and high frequencies, which is difficult to operate, and the present invention reduces engineering difficulty, and a first filter is provided in the antenna system. And/or a second filter, and setting the characteristics of the first filter and the second filter.
  • the setting of the first filter and/or the second filter can be high at low frequency tuning.
  • the frequency impedance is basically kept in the same state, which solves the problem that the high frequency impedance is implicated and disorderly changed when the antenna system is tuned for the low frequency bandwidth.
  • FIG. 1 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 2 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of a first filter and a second filter according to an embodiment of the present invention.
  • FIG. 6 is a structural diagram of a first filter and a second filter according to an embodiment of the present invention.
  • FIG. 7 is a structural diagram of a first filter according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of a second filter according to an embodiment of the present invention.
  • FIG. 9 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 10 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 11 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 12 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 13 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 14 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 15 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 16 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 17 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 18 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 19 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 20 is a structural diagram of an antenna system according to an embodiment of the present invention.
  • FIG. 21 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 1 shows an antenna in which a first filter is connected in parallel with an adjustable device.
  • FIG. 2 is a schematic diagram showing the structure of the antenna system in which the second filter is connected in series between the antenna body and the adjustable device;
  • FIG. 3 shows the antenna system including the first filter, the second filter, and the adjustable A schematic diagram of a device and an antenna body.
  • the antenna system includes:
  • An antenna body an adjustable device, a first filter and/or a second filter.
  • the antenna body is coupled to the adjustable device.
  • the first filter is in parallel with the tunable device, which exhibits high impedance characteristics in the low frequency band and low impedance characteristics in the high frequency band.
  • the second filter exhibits a low impedance characteristic in a low frequency band and a high impedance characteristic in a high frequency band, and is connected in series between the antenna body and the adjustable device, wherein the first end of the second filter is connected to the antenna body, The second end of the second filter is coupled to the adjustable device.
  • the low frequency band and the high frequency band in the above indicate the frequency of the two frequency bands in which the antenna system operates;
  • the high impedance means that in the transmission of the radio frequency system, the energy transmitted by the signal source is reflected due to the impedance mismatch, and the transmission is not achieved.
  • the purpose of energy; conversely, low impedance means that energy can pass smoothly.
  • the antenna system can include an antenna body 100, an adjustable device 200, and a first filter 300.
  • the first filter 300 exhibits a high impedance characteristic in a low frequency band and a low impedance characteristic in a high frequency band, in parallel with the tunable device 200.
  • connection points between the antenna body 100 and the ground, and the adjustable device 200 is serially connected to one of the connection points.
  • One end of the adjustable device 200 is connected to the connection point, and the other end is connected to the ground.
  • the first filter 300 is connected in parallel with the tunable device 200.
  • One of the implementations is that the tunable device 200 is simultaneously connected to the first filter 300 at the connection point such that the antenna body 100 is between the connection point and the ground.
  • the first filter 300 when the first filter 300 is connected in parallel with the adjustable device 200, the first end of the first filter 300 is connected to the antenna body 100, and the second end of the first filter 300 is grounded; or, the first filter The first end of the 300 is coupled to the tunable device 200, and the second end of the first filter 300 is coupled to ground.
  • the antenna system can include an antenna body 100, an adjustable device 200, and a second filter 400.
  • the second filter 400 is connected in series between the antenna body 100 and the adjustable device 200.
  • the first end of the second filter 400 is connected to the antenna body 100, and the second end of the second filter 400 and the adjustable device 200 are connected. connection.
  • the second filter 400 exhibits a low impedance characteristic in a low frequency band and a high impedance characteristic in a high frequency band.
  • connection points between the antenna body 100 and the ground There is one or more connection points between the antenna body 100 and the ground, and the second filter 400 and the adjustable device 200 are sequentially connected to one of the connection points, and the second filter 400 and the adjustable device 200 form a series relationship, so that the antenna
  • the body 100 is reconnected to the connection point through the second filter 400 and the adjustable device 200 in sequence, that is, the adjustable device 200 and the second filter 300 are simultaneously connected in series at the connection point, so that the antenna body 100 is in the A second filter 400 and an adjustable device 200 are connected between the connection point and the ground.
  • the antenna system may include an antenna body 100, an adjustable device 200, a first filter 300, and a second filter 400.
  • the first filter 300 exhibits high impedance characteristics in a low frequency band and low impedance characteristics in a high frequency band, and in parallel with the tunable device 200, the second filter 400 exhibits low impedance characteristics in a low frequency band and high impedance characteristics in a high frequency band. And connected in series between the antenna body 100 and the adjustable device 200.
  • the first end of the second filter 400 is connected to the antenna body 100, and the second end of the second filter 400 is connected to the adjustable device 200.
  • the first end of the first filter 300 is connected to the antenna body 100 and the second filter 400, and the second end of the first filter 300 is connected to the ground.
  • the first end of the first filter 300 is coupled to the antenna body 100 and the second filter 400 and the tunable device, and the second end of the first filter 300 is coupled to the ground.
  • connection points There is one or more connection points between the antenna body 100 and the ground, and the adjustable device 200 is sequentially connected to one of the connection points, and the first filter 300 and the second filter 400 are simultaneously disposed between the connection point and the ground, first The filter 300 is coupled to the bypass of the tunable device 200, and the second filter 400 is The antenna body 100 is coupled between the antenna body 100 and the tunable device 200 such that the antenna body 100 can be reconnected through the second filter 400 and the tunable device 200 at the connection point, and is also grounded through the first filter 300.
  • An antenna system provided by an embodiment of the present invention includes an antenna body, an adjustable device, and a first filter and/or a second filter.
  • the first filter exhibits high impedance characteristics in the low frequency band and low impedance characteristics in the high frequency band, and is connected in parallel with the adjustable device, so when the antenna operates in the low frequency band, the RF current at the grounding point is affected by the high impedance of the filter.
  • the barrier can only flow from the adjustable device branch.
  • the RF current is mainly connected from the filter branch to the ground point because the filter exhibits low impedance, which is equivalent to the through-to-ground point. Even if the state of the adjustable device branch changes, the disturbance to the high-frequency current will be small, thus ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • a second filter may be provided.
  • the second filter exhibits low impedance characteristics in a low frequency band and high impedance characteristics in a high frequency band, and is connected in series between the antenna body and the tunable device, so when the antenna operates in a low frequency band
  • the RF current is directly connected to the adjustable device.
  • the high-impedance characteristic of the filter blocks the RF current from connecting to the adjustable device. This path is equivalent. In the disconnected state, the state change of the adjustable device does not affect the current flow at the antenna ground point, ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • the first filter and the second filter may be simultaneously set.
  • the second filter exhibits low impedance characteristics in a low frequency band and high impedance characteristics in a high frequency band, and is connected in series between the antenna body and the tunable device.
  • the first filter exhibits high impedance characteristics in a low frequency band and low in a high frequency band. Impedance characteristics and in parallel with the tunable device. Therefore, when the antenna operates in the low frequency band, the RF current at the grounding point is blocked by the high impedance of the first filter, and can only flow from the series path formed by the second filter and the tunable device, and the second filter is presented at a low frequency.
  • the RF current is not affected by the second filter and is directly connected to the tunable device.
  • the antenna operates in a high frequency band
  • the first filter exhibits a low impedance, which is equivalent to a through-to-ground point
  • the RF current is mainly connected from the first filter branch to the ground point
  • the second filter exhibits a high
  • the impedance, blocking the RF current to the adjustable device further ensures that the RF current can only be connected from the first filter branch to the ground point.
  • the adjustable device branch changes state, the high frequency current is disturbed. It will be small, thus ensuring that the change of the tunable device is only applied to the low frequency band, and the influence on the high frequency is greatly reduced.
  • each state of the tunable device corresponds to a frequency band covering the antenna.
  • the performance at other frequencies can be neglected, that is, if the antenna Currently operating in the low frequency band, the performance of the antenna in the high frequency band is negligible because the entire terminal operates only in the low frequency band.
  • the terminal system can work in both low and high frequency bands. Since the terminal system needs to increase the bandwidth of the wireless network by increasing the spectrum width, the antenna needs to be at the specified low frequency and high. The frequency band maintains good performance at the same time.
  • the current antenna system uses a state of an adjustable device to make the antenna exhibit good performance at both low and high frequencies, which is difficult to operate, and the present invention reduces engineering difficulty, and a first filter is provided in the antenna system. And/or a second filter, and setting the characteristics of the first filter and the second filter.
  • the setting of the first filter and/or the second filter can be high at low frequency tuning.
  • the frequency impedance is basically kept in the same state, which solves the problem that the high frequency impedance is implicated and disorderly changed when the antenna system is tuned for the low frequency bandwidth.
  • the first filter is a single capacitor, or an LC network composed of an inductor and a capacitor
  • the second filter is a single inductor or an LC network composed of an inductor and a capacitor
  • An embodiment of the present invention provides an antenna system.
  • FIG. 4 a schematic structural diagram of an antenna system is shown.
  • the antenna system includes:
  • the IFA antenna body 110 The IFA antenna body 110, the tunable device 200, and the first filter 300.
  • the first filter 300 exhibits high impedance characteristics at a low frequency band, low impedance characteristics at a high frequency band, and is coupled to a bypass of the tunable device 200.
  • IFA Inverted-F Antenna
  • the IFA has a signal excitation point 111 and one or more grounding points 112.
  • the grounding point is used for impedance tuning of the antenna. Match the impedance of the RF feeder on the board.
  • connection points There is one or more connection points between the IFA antenna body 110 and the ground, and the adjustable device 200 is connected in series at one of the connection points.
  • the first filter 300 is coupled to the bypass of the tunable device 200 to form a parallel relationship with the tunable device 200, that is, the tunable device 200 and the first filter 300 are simultaneously connected at the connection point, so that the IFA antenna body There are two paths between the connection point and the ground in which the first filter 300 is in parallel with the tunable device 200.
  • the first filter 300 may be a single capacitor, or the first filter 300 may be an LC network composed of an inductor and a capacitor, where L represents an inductance and C represents a capacitance.
  • LC The network represents a network of filter circuits built with inductors and capacitors.
  • 5 is a schematic structural diagram of an LC network composed of an inductor and a capacitor
  • FIG. 6 is a schematic diagram showing another structure of an LC network composed of an inductor and a capacitor
  • FIG. 7 shows that the first filter 300 is a single A schematic diagram of a capacitor.
  • the tunable device 200 described above includes a switch, and/or a tunable capacitor, and/or a Pin diode.
  • the antenna system includes an IFA antenna body 110, an adjustable device 200, and a first filter 300.
  • the ground point 112 of the IFA is coupled to the bypass of the tunable device 200.
  • the position of the ground point 112 of the IFA antenna can be used for impedance tuning, ie, adjusting the resonant frequency of the antenna.
  • the first filter 300 exhibits high impedance characteristics in a low frequency band and low impedance characteristics in a high frequency band, and is connected in parallel with the tunable device, so that when the antenna operates in a low frequency band, the RF current at the grounding point is blocked by the high impedance of the filter. It can only be circulated from the adjustable device branch.
  • the RF current is mainly connected from the filter branch to the ground point because the filter exhibits low impedance, which is equivalent to the through-ground point. Even if the state of the adjustable device branch changes, the disturbance to the high-frequency current will be small, thus ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • An embodiment of the present invention provides an antenna system.
  • FIG. 10 a schematic structural diagram of an antenna system is shown.
  • the antenna system includes:
  • the IFA antenna body 110 The IFA antenna body 110, the tunable device 200, and the second filter 400.
  • the second filter 400 exhibits a low impedance at a low frequency band, a high impedance at a high frequency band, and is connected in series between the IFA antenna body 110 and the tunable device 200.
  • IFA Inverted-F Antenna
  • the IFA has an excitation point 111 connecting the signals, and one or more grounding points 112.
  • the grounding point 112 is used for impedance tuning of the antenna. Conducive to matching the impedance of the RF feeder on the board.
  • connection points There is one or more connection points between the IFA antenna body 110 and the ground, and the adjustable device 200 is connected in series at one of the connection points.
  • the second filter 400 is connected in series between the IFA antenna body 110 and the tunable device 200, and is in series relationship with the tunable device 200, so that the IFA antenna body 110 sequentially passes through the second filter 400 and the tunable device 200 at the connection point. Reconnected, that is, the tunable device 200 and the second filter 400 are simultaneously connected in series at the connection point, so that the IFA antenna body 110 has a second filter 400 and an adjustable device between the connection point and the ground. 200.
  • the tunable device 200 includes a switch, and/or a tunable capacitor, and/or a Pin diode.
  • the second filter 400 may include a single inductor, or the second filter 400 may include an LC network composed of an inductor and a capacitor, where L represents an inductance and C represents a capacitance.
  • the LC network represents a network of filter circuits built with inductors and capacitors.
  • FIG. 5 is a schematic structural diagram of an LC network composed of an inductor and a capacitor;
  • FIG. 6 is a schematic diagram showing another structure of an LC network composed of an inductor and a capacitor;
  • FIG. 8 is a diagram showing that the second filter 400 is a single inductor.
  • the antenna system includes an IFA antenna body 110, an adjustable device 200, and a second filter 400.
  • the ground point 112 of the IFA is coupled to the bypass of the tunable device 200.
  • the second filter 400 exhibits low impedance characteristics in a low frequency band and high impedance characteristics in a high frequency band, and is connected in series between the antenna body and the adjustable device, so when the antenna operates in a low frequency band, the RF current at the grounding point is not affected.
  • the effect of the filter is directly connected to the tunable device.
  • the high-impedance characteristic of the filter blocks the RF current from communicating to the tunable device. This path is equivalent to the disconnected state, so the tunable The state change of the device will not affect the current flow at the antenna ground point, ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • An embodiment of the present invention provides an antenna system. Referring to FIG. 12, a schematic structural diagram of an antenna system is shown.
  • the antenna system includes:
  • the IFA antenna body 110 The IFA antenna body 110, the tunable device 200, and the first filter 300.
  • the first filter 300 exhibits high impedance characteristics in the low frequency band, low impedance characteristics in the high frequency band, and is connected in parallel with the tunable device 200.
  • the IFA antenna body 110 of the present embodiment has no grounding point 112.
  • the tunable device 200 includes a switch, and/or a tunable capacitor, and/or a Pin diode.
  • the first filter 300 may include a single capacitor, or the first filter 300 may include an LC network composed of an inductor and a capacitor.
  • the first filter 300 exhibits high impedance in the low frequency band, low impedance in the high frequency band, and is coupled to the bypass of the adjustable device, so the RF current at the grounding point is affected by the filter when the antenna operates in the low frequency band.
  • the impedance barrier can only flow from the adjustable device branch.
  • the RF current is mainly connected from the filter branch to the ground point because the filter exhibits low impedance, which is equivalent to the through-to-ground point. Even if the state of the adjustable device branch changes, the disturbance to the high-frequency current will be small, thus ensuring that the change of the adjustable device only acts on the low frequency band, and has a large influence on the high frequency.
  • the amplitude is weakened.
  • An embodiment of the present invention provides an antenna system. Referring to FIG. 13, a schematic structural diagram of an antenna system is shown.
  • the antenna system includes:
  • the IFA antenna body 110 The IFA antenna body 110, the tunable device 200, and the second filter 400.
  • the second filter 400 exhibits a low impedance at a low frequency band, a high impedance at a high frequency band, and is connected in series between the IFA antenna body 110 and the tunable device 200.
  • the first end of the second filter 400 is coupled to the antenna body 100, and the second end of the second filter 400 is coupled to the tunable device 200.
  • the IFA antenna body 110 of the present embodiment has no grounding point 112.
  • the tunable device 200 includes a switch, and/or a tunable capacitor, and/or a Pin diode.
  • the second filter 400 may include a single inductor, or the second filter 400 may include an LC network composed of an inductor and a capacitor.
  • the second filter 400 exhibits low impedance in the low frequency band and high impedance in the high frequency band, and is connected in series between the antenna body and the adjustable device, so when the antenna operates in the low frequency band, the RF current at the grounding point is not affected by the filter.
  • the effect is directly connected to the tunable device, and when the antenna is operating at a high frequency band, the high-impedance characteristic of the filter blocks the RF current from communicating to the tunable device, and this path is equivalent to the disconnected state, thus the tunable device
  • the change of state will not affect the current flow at the antenna ground point, ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • An embodiment of the present invention provides an antenna system.
  • FIG. 14 a schematic structural diagram of an antenna system is shown.
  • the antenna system includes an antenna body 100, an adjustable device 200, a first filter 300, and a parasitic unit 500.
  • the first filter 300 is connected in parallel with the tunable device 200, which exhibits high impedance characteristics in the low frequency band and low impedance characteristics in the high frequency band.
  • the tunable device 200 is coupled to the antenna body 100 through a parasitic unit 500.
  • the first end of the first filter 300 is connected to the antenna body 100 through the parasitic unit 500.
  • the embodiment of the present invention provides a parasitic unit 500.
  • the parasitic unit 500 has no physical connection with the antenna body 100, but there is a coupling effect of an electromagnetic field.
  • the antenna body trunk branch can be changed by adjusting the structure of the parasitic unit. Operating characteristics in certain frequency bands. If the tunable device is connected to the parasitic unit, the coupling amount of the parasitic unit and the trunk branch can be changed without changing the structure of the parasitic unit, thereby changing the operating characteristics of the antenna. Further, the parasitic unit can increase the working bandwidth of the antenna, and form a capacitive loading for a certain impedance resonance to reduce the operating frequency.
  • An antenna system provided by an embodiment of the present invention includes an antenna body, an adjustable device, a parasitic unit, and a first filter.
  • the first filter exhibits high impedance in the low frequency band and low impedance in the high frequency band, and is connected in parallel with the adjustable device, so when the antenna operates in the low frequency band, the RF current at the grounding point is blocked by the high impedance of the filter. It can only be circulated from the adjustable device branch.
  • the RF current is mainly connected from the filter branch to the ground point because the filter exhibits low impedance, which is equivalent to the through-ground point.
  • the state of the adjustable device branch changes, and the disturbance to the high-frequency current is also small, thus ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • the setting of the first filter can achieve the state in which the high-frequency impedance remains substantially the same at the time of low-frequency tuning, and solves the problem that the high-frequency impedance is implicated and disorderly changed when the antenna system is tuned for the low-frequency bandwidth.
  • the first filter is disposed in the parasitic unit.
  • the low frequency resonance can be tuned without affecting the broadband resonance characteristics of the high frequency.
  • An embodiment of the present invention provides an antenna system.
  • FIG. 15 a schematic structural diagram of an antenna system is shown.
  • the antenna system includes an antenna body 100, an adjustable device 200, a second filter 400, and a parasitic unit 500.
  • the second filter 400 exhibits a low impedance characteristic at a low frequency band and a high impedance characteristic at a high frequency band, wherein the first end of the second filter 400 is connected to the antenna body 100 through the parasitic unit 500, and the second filter 400 is second.
  • the terminal is connected to the adjustable device 200.
  • the tunable device 200 is sequentially connected to the antenna body 100 through the second filter 400 and the parasitic unit 500.
  • the embodiment of the present invention provides a parasitic unit 500.
  • the parasitic unit 500 has no physical connection with the antenna body 100, but there is a coupling effect of an electromagnetic field.
  • the antenna body trunk branch can be changed by adjusting the structure of the parasitic unit. Operating characteristics in certain frequency bands. If the tunable device is connected to the parasitic unit, the coupling amount of the parasitic unit and the trunk branch can be changed without changing the structure of the parasitic unit, thereby changing the operating characteristics of the antenna. Further, the parasitic unit can increase the working bandwidth of the antenna, and form a capacitive loading for a certain impedance resonance to reduce the operating frequency.
  • the second filter 400 exhibits low impedance in a low frequency band and high impedance in a high frequency band
  • the series is connected between the antenna body and the adjustable device, so when the antenna operates in a low frequency band, the RF current at the grounding point is not affected by the filter, and is directly connected to the adjustable device, and when the antenna operates in a high frequency band, the filtering is performed.
  • the high-impedance characteristic of the device blocks the RF current from communicating to the adjustable device. This path is equivalent to the disconnected state, so the state change of the adjustable device does not affect the current flow to the antenna ground point, ensuring the adjustable device. The change only affects the low frequency band, while the effect on the high frequency is greatly reduced.
  • the first filter is disposed in the parasitic unit.
  • the low frequency resonance can be tuned without affecting the broadband resonance characteristics of the high frequency.
  • An embodiment of the present invention provides an antenna system.
  • FIG. 16 a schematic structural diagram of an antenna system is shown.
  • the antenna system includes an antenna body 100, an adjustable device 200, a first filter 300, a second filter 400, and a parasitic unit 500.
  • the first filter 300 exhibits a high impedance characteristic in a low frequency band and a low impedance characteristic in a high frequency band.
  • the first end of the first filter 300 is coupled to the antenna body 100 via a parasitic unit 500, and the first filter 300 is coupled in parallel with the tunable device.
  • the second filter 400 exhibits low impedance characteristics in the low frequency band, high impedance characteristics in the high frequency band, and is connected in series between the parasitic unit 500 on the antenna body trace and the tunable device 200.
  • the first end of the second filter 400 is connected to the antenna body 100 through the parasitic unit 500, and the second end of the second filter 400 is connected to the adjustable device 200.
  • the tunable device 200 is sequentially connected to the antenna body 100 through the second filter 400 and the parasitic unit 500.
  • the embodiment of the present invention provides a parasitic unit 500.
  • the parasitic unit 500 has no physical connection with the antenna body 100, but there is a coupling effect of an electromagnetic field.
  • the antenna body trunk branch can be changed by adjusting the structure of the parasitic unit. Operating characteristics in certain frequency bands. If the tunable device is connected to the parasitic unit, the coupling amount of the parasitic unit and the trunk branch can be changed without changing the structure of the parasitic unit, thereby changing the operating characteristics of the antenna. Further, the parasitic unit can increase the working bandwidth of the antenna, and form a capacitive loading for a certain impedance resonance to reduce the operating frequency.
  • the second filter exhibits low impedance characteristics in a low frequency band and high impedance heat in a high frequency band, and is connected in series between the antenna body and the adjustable device, and the first filter exhibits high impedance in a low frequency band and is in a high frequency band.
  • the isolation can only flow from the series path formed by the second filter and the tunable device, while the second filter exhibits low impedance at low frequencies, so the RF current is not affected by the second filter and is directly connected to the tunable device.
  • the RF current is mainly connected from the first filter branch to the ground point, and the second filter exhibits a high
  • the impedance blocking the RF current to the adjustable device, further ensures that the RF current can only be connected from the first filter branch to the ground point.
  • the adjustable device branch changes state, the high frequency current is disturbed. It will be small, thus ensuring that the change of the tunable device is only applied to the low frequency band, and the influence on the high frequency is greatly reduced.
  • the first filter is disposed in the parasitic unit.
  • the low frequency resonance can be tuned without affecting the broadband resonance characteristics of the high frequency.
  • An embodiment of the present invention provides an antenna system. Referring to FIG. 17, a schematic structural diagram of an antenna system is shown.
  • the antenna system includes:
  • the IFA antenna body 110 The IFA antenna body 110, the tunable device 200, the parasitic unit 500, and the first filter 300.
  • the first filter 300 exhibits high impedance characteristics in the low frequency band, low impedance characteristics in the high frequency band, and is connected in parallel with the tunable device 200.
  • the tunable device 200 is coupled to the IFA antenna body 110 via a parasitic unit 500.
  • the first end of the first filter 300 is connected to the IFA antenna body 110 through a parasitic unit 500, and the second end of the first filter 300 is connected to the ground.
  • IFA Inverted-F Antenna
  • the IFA has a signal excitation point 111 and one or more grounding points 112.
  • the grounding point is used for impedance tuning of the antenna. Match the impedance of the RF feeder on the board.
  • the first filter 300 may include a single capacitor, or the first filter 300 may include an LC network composed of an inductor and a capacitor, where L represents an inductance and C represents a capacitance.
  • the LC network represents a network of filter circuits built with inductors and capacitors.
  • FIG. 5 is a schematic structural diagram of an LC network composed of an inductor and a capacitor;
  • FIG. 6 is a schematic diagram showing another structure of an LC network composed of an inductor and a capacitor;
  • FIG. 7 shows that the first filter 300 is a single capacitor.
  • the tunable device 200 includes a switch, and/or a tunable capacitor, and/or a Pin diode.
  • the first filter 300 exhibits a high impedance characteristic in a low frequency band and a low impedance characteristic in a high frequency band, and is coupled to the tunable device and coupled to the parasitic unit 500, so when the antenna operates in a low frequency band, the parasitic single
  • the RF current on the element is blocked by the high impedance of the filter and can only be circulated from the adjustable device branch.
  • the RF current is mainly from the low impedance of the filter, which is equivalent to the through point to the grounding point.
  • the filter branch is connected to the grounding point. At this time, even if the state of the adjustable device branch changes, the disturbance to the high-frequency current will be small, thereby ensuring that the change of the adjustable device only acts on the low frequency band, and the high The frequency impact has been greatly reduced.
  • An embodiment of the present invention provides an antenna system. Referring to FIG. 18, a schematic structural diagram of an antenna system is shown.
  • the antenna system includes:
  • the IFA antenna body 110 The IFA antenna body 110, the tunable device 200, the parasitic unit 500, and the second filter 400.
  • the second filter 400 exhibits a low impedance characteristic at a low frequency band and a high impedance characteristic at a high frequency band, wherein the first end of the second filter 400 is connected to the IFA antenna body 110 through the parasitic unit 500, and the second filter 400 The two ends are connected to the tunable device 200, and the second filter 400 is connected in series between the parasitic unit 500 and the tunable device 200.
  • the tunable device 200 includes a switch, and/or a tunable capacitor, and/or a Pin diode.
  • the second filter 400 can include a single inductor, or the second filter 400 can include an LC network of inductors and capacitors.
  • the second filter 400 exhibits a low impedance characteristic in a low frequency band and a high impedance characteristic in a high frequency band, and is connected in series between the parasitic unit and the tunable device, so when the antenna operates in a low frequency band, the RF current on the parasitic unit is not Under the influence of the filter, it is directly connected to the adjustable device.
  • the high-resistance characteristic of the filter blocks the RF current from connecting to the adjustable device. This path is equivalent to the disconnected state, so The state change of the device will not affect the current flow on the antenna parasitic unit, ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • An embodiment of the present invention provides an antenna system. Referring to FIG. 19, a schematic structural diagram of an antenna system is shown.
  • the antenna system includes:
  • the Monopole antenna body 120, the tunable device 200, the parasitic unit 500, and the first filter 300 are the Monopole antenna body 120, the tunable device 200, the parasitic unit 500, and the first filter 300.
  • the Monopole antenna also known as a monopole antenna, is a type of small antenna. Compared with the IFA antenna, the main difference is that the Monopole antenna does not have the grounding point 112 of the IFA antenna, and there is no grounding point that is connected to the ground through the adjustable device. There is also no ground point that is connected to ground through the first filter and the second filter.
  • the first filter 300 is connected in parallel with the tunable device 200, which exhibits high impedance characteristics in the low frequency band and low impedance characteristics in the high frequency band.
  • the tunable device 200 is coupled to the Monopole antenna body 120 via a parasitic unit 500.
  • the first end of the first filter 300 is coupled to the Monopole antenna body 120 via a parasitic unit 500.
  • the first filter 300 may include a single capacitor, or the first filter 300 may include an LC network composed of an inductor and a capacitor.
  • the tunable device 200 includes a switch, and/or a tunable capacitor, and/or a Pin diode.
  • the first filter 300 exhibits high impedance characteristics in a low frequency band and low impedance characteristics in a high frequency band, and is connected in parallel with the tunable device, so that when the antenna operates in a low frequency band, the RF current at the grounding point is blocked by the high impedance of the filter. It can only be circulated from the adjustable device branch.
  • the RF current is mainly connected from the filter branch to the ground point because the filter exhibits low impedance, which is equivalent to the through-ground point. Even if the state of the adjustable device branch changes, the disturbance to the high-frequency current will be small, thus ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • the parasitic unit is disposed on the Monopole antenna body 120 to increase the working bandwidth of the antenna, and can also form a capacitive loading for a certain impedance resonance, thereby reducing the working frequency. Therefore, the first filter is set at On the parasitic element, the low-band resonance can be tuned without affecting the broadband resonance characteristics of the high frequency.
  • An embodiment of the present invention provides an antenna system. Referring to FIG. 20, a schematic structural diagram of an antenna system is shown.
  • the antenna system includes:
  • the Monopole antenna body 120, the tunable device 200, the parasitic unit 500, and the second filter 400 is the Monopole antenna body 120, the tunable device 200, the parasitic unit 500, and the second filter 400.
  • the second filter 400 exhibits a low impedance characteristic at a low frequency band and a high impedance characteristic at a high frequency band, wherein the first end of the second filter 400 is connected to the Monopole antenna body 120 through the parasitic unit 500, and the second filter 400 The two ends are connected to the adjustable device 200.
  • the tunable device 200 is sequentially connected to the Monopole antenna body 120 through the second filter 400 and the parasitic unit 500.
  • the tunable device 200 includes a switch, or a tunable capacitor, or a Pin diode.
  • the second filter 400 may include a single inductor, or the first filter 300 may include an LC network composed of an inductor and a capacitor.
  • the second filter 400 exhibits low impedance in a low frequency band and high impedance in a high frequency band, and is connected in series between the antenna body and the adjustable device, so when the antenna operates in a low frequency band, the RF power at the grounding point The flow is not affected by the filter and is directly connected to the tunable device.
  • the high-impedance characteristic of the filter blocks the RF current from being connected to the tunable device, and the path is equivalent to the disconnected state. Therefore, the state change of the adjustable device does not affect the current flow at the antenna ground point, ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • the parasitic unit is disposed on the Monopole antenna body 120 to increase the working bandwidth of the antenna, and can also form a capacitive loading for a certain impedance resonance, thereby reducing the working frequency. Therefore, the first filter is set at On the parasitic element, the low-band resonance can be tuned without affecting the broadband resonance characteristics of the high frequency.
  • the antenna body in the above embodiment is not limited to the IFA antenna, or the Monopole antenna, and other antenna forms are also not limited herein.
  • an embodiment of the present invention further provides a terminal, including an antenna system, where the antenna system includes an antenna body, an adjustable device, a first filter, and/or a second filter;
  • the antenna body is connected to the adjustable device
  • the first filter is connected in parallel with the tunable device, and the first filter exhibits high impedance characteristics in a low frequency band and low impedance characteristics in a high frequency band;
  • the second filter is connected in series between the antenna body and the adjustable device, wherein the first end of the second filter is connected to the antenna body, and the second end of the second filter is connected to the adjustable device.
  • the second filter exhibits low impedance characteristics in a low frequency band and high impedance characteristics in a high frequency band, and
  • the first filter exhibits high impedance characteristics in the low frequency band and low impedance characteristics in the high frequency band, and is connected in parallel with the adjustable device, so when the antenna operates in the low frequency band, the RF current at the grounding point is affected by the high impedance of the filter.
  • the barrier can only flow from the adjustable device branch.
  • the RF current is mainly connected from the filter branch to the ground point because the filter exhibits low impedance, which is equivalent to the through-to-ground point. Even if the state of the adjustable device branch changes, the disturbance to the high-frequency current will be small, thus ensuring that the change of the adjustable device only acts on the low frequency band, and the influence on the high frequency is greatly reduced.
  • a second filter may be provided.
  • the second filter exhibits low impedance characteristics in a low frequency band and high impedance characteristics in a high frequency band, and is connected in series between the antenna body and the tunable device, so when the antenna operates in a low frequency band
  • the RF current is directly connected to the adjustable device.
  • the high-impedance characteristic of the filter blocks the RF current from connecting to the adjustable device. This path is equivalent.
  • the state change of the adjustable device does not affect the current flow at the antenna ground point, ensuring that the change of the adjustable device only acts on the low frequency band, and is high. The frequency impact has been greatly reduced.
  • the first filter and the second filter may be simultaneously set.
  • the second filter exhibits low impedance characteristics in a low frequency band and high impedance characteristics in a high frequency band, and is connected in series between the antenna body and the tunable device.
  • the first filter exhibits high impedance characteristics in a low frequency band and low in a high frequency band. Impedance characteristics and in parallel with the tunable device. Therefore, when the antenna operates in the low frequency band, the RF current at the grounding point is blocked by the high impedance of the first filter, and can only flow from the series path formed by the second filter and the tunable device, and the second filter is presented at a low frequency.
  • the RF current is not affected by the second filter and is directly connected to the tunable device.
  • the antenna operates in a high frequency band
  • the first filter exhibits a low impedance, which is equivalent to a through-to-ground point
  • the RF current is mainly connected from the first filter branch to the ground point
  • the second filter exhibits a high
  • the impedance, blocking the RF current to the adjustable device further ensures that the RF current can only be connected from the first filter branch to the ground point.
  • the adjustable device branch changes state, the high frequency current is disturbed. It will be small, thus ensuring that the change of the tunable device is only applied to the low frequency band, and the influence on the high frequency is greatly reduced.
  • each state of the tunable device corresponds to a frequency band covering the antenna.
  • the performance at other frequencies can be neglected, that is, if the antenna Currently operating in the low frequency band, the performance of the antenna in the high frequency band is negligible because the entire terminal operates only in the low frequency band.
  • the terminal system can work in both low and high frequency bands. Since the terminal system needs to increase the bandwidth of the wireless network by increasing the spectrum width, the antenna needs to be at the specified low frequency and high. The frequency band maintains good performance at the same time.
  • the current antenna system uses a state of an adjustable device to make the antenna exhibit good performance at both low and high frequencies, which is difficult to operate, and the present invention reduces engineering difficulty, and a first filter is provided in the antenna system. And/or a second filter, and setting the characteristics of the first filter and the second filter.
  • the setting of the first filter and/or the second filter can be high at low frequency tuning.
  • the frequency impedance is basically kept in the same state, which solves the problem that the high frequency impedance is implicated and disorderly changed when the antenna system in the terminal is tuned for low frequency bandwidth.
  • the antenna system comprises an antenna body, an adjustable device, a first filter, and a parasitic unit;
  • the adjustable device is connected to the antenna body through the parasitic unit;
  • the first end of the first filter is coupled to the antenna body via a parasitic unit.
  • the antenna system comprises an antenna body, an adjustable device, a second filter, and a parasitic unit;
  • a first end of the second filter is connected to the antenna body through a parasitic unit
  • the adjustable device is sequentially connected to the antenna body through the second filter and the parasitic unit.
  • the antenna system comprises an antenna body, an adjustable device, a first filter, a second filter, and a parasitic unit;
  • the first end of the first filter is connected to the antenna body through a parasitic unit
  • a first end of the second filter is connected to the antenna body through a parasitic unit
  • the adjustable device is sequentially connected to the antenna body through the second filter and the parasitic unit.
  • the first filter is a single capacitor, or an LC network composed of an inductor and a capacitor.
  • the second filter is a single inductor, or an LC network composed of an inductor and a capacitor.
  • the antenna body is an IFA antenna, or a Monopole antenna.

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Abstract

本发明实施例公开一种天线系统及终端，包括天线本体，可调器件，第一滤波器和/或第二滤波器；天线本体与可调器件连接；第一滤波器与可调器件并联，第一滤波器在在低频段呈现高阻抗特性、在高频段呈现低阻抗特性；第二滤波器串联接在天线本体与可调器件之间，第二滤波器的第一端与天线本体连接，第二滤波器的第二端与可调器件连接，第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性。上述第一滤波器和/或第二滤波器的设置可以达到在低频调谐时，高频阻抗基本保持同一的状态，解决了天线系统为低频带宽调谐时，高频阻抗受牵连而无序变化的问题。本发明实施例还提供一种终端，该终端包括上述的天线系统。

Description

一种天线系统以及终端 技术领域
本发明涉及天线领域，更具体的说是涉及一种天线系统以及终端。
背景技术
随着4G-LTE技术的发展和应用，终端产品的天线带宽需要覆盖更多的频段。根据用户对产品便携性及造型美观的需求，要求将天线占用的空间尽可能的小，而小型化与宽频带却是一对矛盾，因此，在这样的背景下，可调天线成为解决矛盾问题的趋势技术之一。所谓可调天线，就是在天线的“敏感位置”加载不同的电感电容器件或者实现连通与断开的变化，从而改变天线的阻抗特性。其中，上述的“敏感位置”主要有天线的激励点、接地点或者天线本体走线等。
现有的可调天线，在天线的接地点上串接一可调器件如开关器件，开关器件后端接上不同感值或容值的电感或电容，再接到地上。串接可调器件之后，可以根据天线设计的需求，在“多个电感或电容或直通到地”之间做切换，随着开关的切换，接地点连通的器件不同，会连带得影响到激励点处的阻抗特性，于是就可以实现天线工作频段的变化，最终在多个变化状态下，可覆盖频段的总合就是可调天线最终可覆盖到的总带宽。
现有技术中使用可调器件拓展了天线低频的带宽，但是，当可调器件进行切换或变化时，虽然天线的低频工作频段会按照预期的变化而改变，但每个可调器件切换或变化后，或者在可调器件的每个工作状态下，天线在高频段的频响特性也会相应的发生变化，而且高频的变化往往是无规则的。
发明内容
有鉴于此，本发明的目的是要解决为低频带宽调谐时，高频阻抗受牵连而无序变化的问题，技术方案如下：
本申请的第一方面提供了一种天线系统，天线系统包括：
天线本体，可调器件，第一滤波器和/或第二滤波器；
所述天线本体与所述可调器件连接；
所述第一滤波器与所述可调器件并联，所述第一滤波器在在低频段呈现 高阻抗特性、在高频段呈现低阻抗特性；
所述第二滤波器串联接在所述天线本体与所述可调器件之间，所述第二滤波器的第一端与所述天线本体连接，所述第二滤波器的第二端与所述可调器件连接，所述第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性。
结合第一方面，在第一方面的第一种可能的实现方式中，
所述天线系统包括所述天线本体，所述可调器件，所述第一滤波器，还包括寄生单元；
所述可调器件通过所述寄生单元与所述天线本体连接；
所述第一滤波器的第一端通过所述寄生单元与所述天线本体连接。
结合第一方面，在第一方面的第二种可能的实现方式中，
所述天线系统包括所述天线本体，所述可调器件，所述第二滤波器，还包括寄生单元；
所述第二滤波器的第一端通过所述寄生单元与所述天线本体连接；
所述可调器件依次通过所述第二滤波器、所述寄生单元与所述天线本体连接。
结合第一方面，在第一方面的第三种可能的实现方式中，
所述天线系统包括所述天线本体，所述可调器件，所述第一滤波器，所述第二滤波器，还包括寄生单元；
所述第一滤波器的第一端通过所述寄生单元与所述天线本体连接；
所述第二滤波器的第一端通过所述寄生单元与所述天线本体连接；
所述可调器件依次通过所述第二滤波器、所述寄生单元与所述天线本体连接。
结合第一方面的第一种可能实现方式或第一方面的第三种可能实现方式中，在第一方面的第四种可能的实现方式中，
所述第一滤波器为单颗电容，或，电感电容组成的LC网络。
结合第一方面的第二种可能实现方式或第一方面的第三种可能实现方式中，在第一方面的第五种可能的实现方式中，
所述第二滤波器为单颗电感、或，电感电容组成的LC网络。
结合第一方面，在第一方面的第六种可能的实现方式中，
所述天线本体为IFA天线，或，Monopole天线。
本申请的第二方面提供了一种终端，终端包括天线系统，所述天线系统包括天线本体，可调器件，第一滤波器和/或第二滤波器；
所述天线本体与所述可调器件连接；
所述第一滤波器与所述可调器件并联，所述第一滤波器在在低频段呈现高阻抗特性、在高频段呈现低阻抗特性；
所述第二滤波器串联接在所述天线本体与所述可调器件之间，所述第二滤波器的第一端与所述天线本体连接，所述第二滤波器的第二端与所述可调器件连接，所述第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性。
结合第二方面，在第二方面的第一种可能的实现方式中，
所述天线系统包括所述天线本体，所述可调器件，所述第一滤波器，还包括寄生单元；
所述可调器件通过所述寄生单元与所述天线本体连接；
所述第一滤波器的第一端通过所述寄生单元与所述天线本体连接。
结合第二方面，在第二方面的第二种可能的实现方式中，
所述天线系统包括所述天线本体，所述可调器件，所述第二滤波器，还包括寄生单元；
所述第二滤波器的第一端通过所述寄生单元与所述天线本体连接；
所述可调器件依次通过所述第二滤波器、所述寄生单元与所述天线本体连接。
结合第二方面，在第二方面的第三种可能的实现方式中，
所述天线系统包括所述天线本体，所述可调器件，所述第一滤波器，所述第二滤波器，还包括寄生单元；
所述第一滤波器的第一端通过所述寄生单元与所述天线本体连接；
所述第二滤波器的第一端通过所述寄生单元与所述天线本体连接；
所述可调器件依次通过所述第二滤波器、所述寄生单元与所述天线本体连接。
结合第二方面的第一种可能实现方式或第二方面的第三种可能实现方式中，在第一方面的第四种可能的实现方式中，
所述第一滤波器为单颗电容，或，电感电容组成的LC网络。
结合第二方面的第二种可能实现方式或第二方面的第三种可能实现方 式中，在第一方面的第五种可能的实现方式中，
所述第二滤波器为单颗电感、或，电感电容组成的LC网络。
结合第二方面，在第二方面的第六种可能的实现方式中，
所述天线本体为IFA天线，或，Monopole天线。
其中，第一滤波器在低频段呈现高阻抗、在高频段呈现低阻抗，且并联接在可调器件的旁路上，所以当天线工作在低频段时，接地点上的射频电流受滤波器的高阻抗阻隔，只能从可调器件支路流通，而当工作在高频段时，由于滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动也会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。或者，还可以设置第二滤波器，第二滤波器在低频段呈现低阻抗、在高频段呈现高阻抗，且串联接在天线本体与可调器件之间，所以当天线工作在低频段时，接地点上射频电流不受滤波器的影响，直接连通到可调器件，而当天线工作在高频段时，滤波器的高阻特性阻断射频电流连通到可调器件，此条通路相当于断开的状态，于是可调器件的状态变化就不会影响到天线接地点的电流流动，保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。或者，还可以同时设置第一滤波器以及第二滤波器。第二滤波器在低频段呈现低阻抗、在高频段呈现高阻抗，且串联接在天线本体与可调器件之间，第一滤波器在低频段呈现高阻抗、在高频段呈现低阻抗，且并联接在第二滤波器与可调器件串联通路的旁路上。所以当天线工作在低频段时，接地点上的射频电流受第一滤波器的高阻抗阻隔，只能从第二滤波器与可调器件构成的串联通路流通，而第二滤波器在低频呈现低阻抗，所以射频电流不受第二滤波器的影响，直接连通到可调器件。而当天线工作在高频段时，由于第一滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从第一滤波器支路连通到接地点，同时第二滤波器呈现的是高阻抗，阻断射频电流连通到可调器件，进一步保障了射频电流只能从第一滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
在LTE-4G天线宽频带的可调技术中，可调器件的每一个状态对应覆盖天线的一段频带，当天线在某一频段工作时，其他频率上的性能可以忽略，也就是说，如果天线当前在低频段工作，此时天线在高频段的性能可以忽略， 因为整个终端只工作在低频段。但在LTE-4G演进出载波聚合技术后，终端系统可以同时在低、高等两个频段工作，由于终端系统需要通过增加频谱宽度来提升无线网络的带宽，于是天线就需要在指定的低频和高频两个频段同时保持好的性能。而目前的天线系统要用一个可调器件的状态就使得天线在低频和高频都出现好的性能，工程难度较大，而本发明降低了工程难度，在天线系统中设置了第一滤波器和/或第二滤波器，且对第一滤波器、第二滤波器的特性进行了设置，由上述可知，第一滤波器和/或第二滤波器的设置可以达到在低频调谐时，高频阻抗基本保持同一的状态，解决了天线系统为低频带宽调谐时，高频阻抗受牵连而无序变化的问题。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的天线系统的结构图；
图2为本发明实施例提供的天线系统的结构图；
图3为本发明实施例提供的天线系统的结构图；
图4为本发明实施例提供的天线系统的结构图；
图5为本发明实施例提供的第一滤波器、第二滤波器的一种结构图；
图6为本发明实施例提供的第一滤波器、第二滤波器的一种结构图；
图7为本发明实施例提供的第一滤波器的一种结构图；
图8为本发明实施例提供的第二滤波器的一种结构图；
图9为本发明实施例提供的天线系统的结构图；
图10为本发明实施例提供的天线系统的结构图；
图11为本发明实施例提供的天线系统的结构图；
图12为本发明实施例提供的天线系统的结构图；
图13为本发明实施例提供的天线系统的结构图；
图14为本发明实施例提供的天线系统的结构图；
图15为本发明实施例提供的天线系统的结构图；
图16为本发明实施例提供的天线系统的结构图；
图17为本发明实施例提供的天线系统的结构图；
图18为本发明实施例提供的天线系统的结构图；
图19为本发明实施例提供的天线系统的结构图；
图20为本发明实施例提供的天线系统的结构图；
图21为本发明实施例提供的终端的一种结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供一种天线系统，参见图1、图2以及图3，分别示出了天线系统的一种结构示意图，其中，图1示出了第一滤波器与可调器件并联的天线系统结构示意图；图2示出了第二滤波器串联接在天线本体与可调器件之间的天线系统结构示意图；图3示出了天线系统包括第一滤波器、第二滤波器、可调器件以及天线本体的一种结构示意图。
天线系统包括：
天线本体，可调器件，第一滤波器和/或第二滤波器。
天线本体与可调器件连接。
第一滤波器与可调器件并联，第一滤波器在低频段呈现高阻抗特性、在高频段呈现低阻抗特性。
第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗的特性，且串联接在天线本体与可调器件之间，其中，第二滤波器的第一端与天线本体连接，第二滤波器的第二端与可调器件连接。
上述中的低频段、高频段表示天线系统工作的两个频段的频率高低之别；高阻抗，是指在射频系统传输中，信号源输送的能量因阻抗失配而被反射，达不到输送能量的目的；反之，低阻抗，意味着能量能顺利通过。
参见图1，天线系统可以包括天线本体100、可调器件200，以及第一滤波器300。第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，与可调器件200并联。
天线本体100与地之间有一个或多个连接点，在其中一个连接点上串接可调器件200，可调器件200的一端与连接点连接，另一端与地连接。第一滤波器300与可调器件200并联，其中的一种实现方式是，可调器件200与第一滤波器300同时连接在该连接点上，使得天线本体100在该连接点与地之间有第一滤波器300与可调器件200并行的两条通路。另外，第一滤波器300与可调器件200并联时，第一滤波器的300的第一端与天线本体100连接，第一滤波器的300的第二端接地；或者，第一滤波器的300的第一端与可调器件200连接，第一滤波器的300的第二端接地。
参见图2，天线系统可以包括天线本体100、可调器件200，以及第二滤波器400。第二滤波器400串联接在天线本体100与可调器件200之间，其中，第二滤波器400的第一端与天线本体100连接，第二滤波器400的第二端与可调器件200连接。第二滤波器400在低频段呈现低阻抗特性、在高频段呈现高阻抗特性。
天线本体100与地之间有一个或多个连接点，在其中一个连接点上依次连接第二滤波器400以及可调器件200，第二滤波器400与可调器件200构成串联关系，使得天线本体100在该连接点依次通过第二滤波器400和可调器件200再连接地，也即，可调器件200与第二滤波器300同时串接在该连接点上，使得天线本体100在该连接点与地之间串有第二滤波器400与可调器件200。
参见图3，天线系统可以包括天线本体100、可调器件200，第一滤波器300以及第二滤波器400。第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件200并联上，第二滤波器400在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且串联接在天线本体100与可调器件200之间。其中，第二滤波器400的第一端与天线本体100连接，第二滤波器400的第二端与可调器件200连接。第一滤波器300的第一端与天线本体100和第二滤波器400连接，第一滤波器300的第二端与地连接。或者，第一滤波器300的第一端与天线本体100与第二滤波器400和可调器件连接，第一滤波器300的第二端与地连接。
天线本体100与地之间有一个或多个连接点，在其中一个连接点上依次连接可调器件200，连接点和地之间同时设置第一滤波器300和第二滤波器400，第一滤波器300并联接在可调器件200的旁路上，第二滤波器400串 联接在天线本体100与可调器件200之间，使得天线本体100在该连接点可通过第二滤波器400和可调器件200再连接地，同时，还通过第一滤波器300接地。
本发明实施例提供的天线系统包括天线本体、可调器件，以及第一滤波器和/或第二滤波器。
其中，第一滤波器在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件并联，所以当天线工作在低频段时，接地点上的射频电流受滤波器的高阻抗阻隔，只能从可调器件支路流通，而当工作在高频段时，由于滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动也会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
或者，还可以设置第二滤波器，第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且串联接在天线本体与可调器件之间，所以当天线工作在低频段时，接地点上射频电流不受滤波器的影响，直接连通到可调器件，而当天线工作在高频段时，滤波器的高阻特性阻断射频电流连通到可调器件，此条通路相当于断开的状态，于是可调器件的状态变化就不会影响到天线接地点的电流流动，保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
或者，还可以同时设置第一滤波器以及第二滤波器。第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且串联接在天线本体与可调器件之间，第一滤波器在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件并联。所以当天线工作在低频段时，接地点上的射频电流受第一滤波器的高阻抗阻隔，只能从第二滤波器与可调器件构成的串联通路流通，而第二滤波器在低频呈现低阻抗，所以射频电流不受第二滤波器的影响，直接连通到可调器件。而当天线工作在高频段时，由于第一滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从第一滤波器支路连通到接地点，同时第二滤波器呈现的是高阻抗，阻断射频电流连通到可调器件，进一步保障了射频电流只能从第一滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
在LTE-4G天线宽频带的可调技术中，可调器件的每一个状态对应覆盖天线的一段频带，当天线在某一频段工作时，其他频率上的性能可以忽略，也就是说，如果天线当前在低频段工作，此时天线在高频段的性能可以忽略，因为整个终端只工作在低频段。但在LTE-4G演进出载波聚合技术后，终端系统可以同时在低、高等两个频段工作，由于终端系统需要通过增加频谱宽度来提升无线网络的带宽，于是天线就需要在指定的低频和高频两个频段同时保持好的性能。而目前的天线系统要用一个可调器件的状态就使得天线在低频和高频都出现好的性能，工程难度较大，而本发明降低了工程难度，在天线系统中设置了第一滤波器和/或第二滤波器，且对第一滤波器、第二滤波器的特性进行了设置，由上述可知，第一滤波器和/或第二滤波器的设置可以达到在低频调谐时，高频阻抗基本保持同一的状态，解决了天线系统为低频带宽调谐时，高频阻抗受牵连而无序变化的问题。
在本发明的上述实施例中，所述第一滤波器为单颗电容，或，电感电容组成的LC网络；所述第二滤波器为单颗电感、或，电感电容组成的LC网络。
本发明实施例提供一种天线系统，参见图4，示出了天线系统的一种结构示意图，天线系统包括：
IFA天线本体110、可调器件200，以及第一滤波器300。
第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且并联接在可调器件200的旁路上。
IFA(Inverted-F Antenna；倒F天线)是电小天线中的一种，IFA有一条连通信号的激励点111，还有一条或多条接地点112，接地点用于天线的阻抗调谐，利于与板上射频馈线的阻抗匹配。
IFA天线本体110与地之间有一个或多个连接点，在其中一个连接点上串接可调器件200。第一滤波器300并联接在可调器件200的旁路上，与可调器件200构成并联关系，也即，可调器件200与第一滤波器300同时连接在该连接点上，使得IFA天线本体110在该连接点与地之间有第一滤波器300与可调器件200并行的两条通路。
如图5、6、7所示，第一滤波器300可以为单颗电容，或者，第一滤波器300可以为电感电容组成的LC网络，其中，L表示电感、C表示电容。LC 网络表示用电感、电容搭建起来的滤波器电路网络。其中，图5示出了电感电容组成的LC网络的一种结构示意图；图6示出了电感电容组成的LC网络的另一种结构示意图；图7示出了第一滤波器300为单颗电容的一种示意图。
进一步的，上述的可调器件200包括开关，和/或，可调电容，和/或，Pin二极管。
另外，参见图9，天线系统包括IFA天线本体110、可调器件200，以及第一滤波器300。其中，IFA的接地点112并联接在可调器件200的旁路上。IFA天线的接地点112的位置可以用来阻抗调谐，即调整天线的谐振频率。
第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件并联，所以当天线工作在低频段时，接地点上的射频电流受滤波器的高阻抗阻隔，只能从可调器件支路流通，而当工作在高频段时，由于滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动也会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
本发明实施例提供一种天线系统，参见图10，示出了天线系统的一种结构示意图，天线系统包括：
IFA天线本体110、可调器件200，以及第二滤波器400。
第二滤波器400在低频段呈现低阻抗、在高频段呈现高阻抗，且串联接在IFA天线本体110与可调器件200之间。
IFA(Inverted-F Antenna；倒F天线)是电小天线中的一种，IFA有一条连通信号的激励点111，还有一条或多条接地点112，接地点112用于天线的阻抗调谐，利于与板上射频馈线的阻抗匹配。
IFA天线本体110与地之间有一个或多个连接点，在其中一个连接点上串接可调器件200。第二滤波器400串联接在IFA天线本体110与可调器件200之间，与可调器件200构成串联关系，使得IFA天线本体110在该连接点依次通过第二滤波器400和可调器件200再连接地，也即，可调器件200与第二滤波器400同时串接在该连接点上，使得IFA天线本体110在该连接点与地之间串有第二滤波器400与可调器件200。
其中，可调器件200包括开关，和/或，可调电容，和/或，Pin二极管。
如图5、6、8所示，第二滤波器400可以包括单颗电感，或者，第二滤波器400可以包括电感电容组成的LC网络，其中，L表示电感、C表示电容。LC网络表示用电感、电容搭建起来的滤波器电路网络。图5示出了电感电容组成的LC网络的一种结构示意图；图6示出了电感电容组成的LC网络的另一种结构示意图；图8示出了第二滤波器400为单颗电感的一种示意图。
另外，参见图11，天线系统包括IFA天线本体110、可调器件200，以及第二滤波器400。与上述实施例不同的是，IFA的接地点112并联接在可调器件200的旁路上。
第二滤波器400在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且串联接在天线本体与可调器件之间，所以当天线工作在低频段时，接地点上射频电流不受滤波器的影响，直接连通到可调器件，而当天线工作在高频段时，滤波器的高阻特性阻断射频电流连通到可调器件，此条通路相当于断开的状态，于是可调器件的状态变化就不会影响到天线接地点的电流流动，保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
本发明实施例提供一种天线系统，参见图12，示出了天线系统的一种结构示意图，天线系统包括：
IFA天线本体110、可调器件200，以及第一滤波器300。
第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件200的并联。
与图4、图9的IFA相比，主要差异点是，本实施例的IFA天线本体110没有接地点112。
其中，可调器件200包括开关，和/或，可调电容，和/或，Pin二极管。
如图5、6、7所示，第一滤波器300可以包括单颗电容，或者，第一滤波器300可以包括电感电容组成的LC网络。
第一滤波器300在低频段呈现高阻抗、在高频段呈现低阻抗，且并联接在可调器件的旁路上，所以当天线工作在低频段时，接地点上的射频电流受滤波器的高阻抗阻隔，只能从可调器件支路流通，而当工作在高频段时，由于滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动也会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大 幅减弱。
本发明实施例提供一种天线系统，参见图13，示出了天线系统的一种结构示意图，天线系统包括：
IFA天线本体110、可调器件200，以及第二滤波器400。
第二滤波器400在低频段呈现低阻抗、在高频段呈现高阻抗，且串联接在IFA天线本体110与可调器件200之间。第二滤波器400的第一端与天线本体100连接，第二滤波器400的第二端与可调器件200连接。
与图10、11的IFA相比，本实施例的IFA天线本体110没有接地点112。
其中，可调器件200包括开关，和/或，可调电容，和/或，Pin二极管。
如图5、6、8所示，第二滤波器400可以包括单颗电感，或者，第二滤波器400可以包括电感电容组成的LC网络。
第二滤波器400在低频段呈现低阻抗、在高频段呈现高阻抗，且串联接在天线本体与可调器件之间，所以当天线工作在低频段时，接地点上射频电流不受滤波器的影响，直接连通到可调器件，而当天线工作在高频段时，滤波器的高阻特性阻断射频电流连通到可调器件，此条通路相当于断开的状态，于是可调器件的状态变化就不会影响到天线接地点的电流流动，保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
本发明实施例提供一种天线系统，参见图14，示出了天线系统的一种结构示意图。天线系统包括天线本体100，可调器件200，第一滤波器300，寄生单元500。
第一滤波器300与可调器件200并联，第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性。
可调器件200通过寄生单元500与天线本体100连接。
第一滤波器300的第一端通过寄生单元500与天线本体100连接。
与上述实施例不同的是，本发明实施例设置了寄生单元500，寄生单元500与天线本体100没有物理上的连接，但存在电磁场的耦合作用，通过调节寄生单元的结构可以改变天线本体主干分支在某些频段的工作特性。若把可调器件连接在寄生单元上，可以不需要改变寄生单元的结构，就能够改变寄生单元与主干分支的耦合量，从而改变天线的工作特性。进一步的，寄生单元可以增加天线的工作带宽，对某个阻抗谐振形成容性加载从而降低工作频点。
本发明实施例提供的天线系统包括天线本体、可调器件，寄生单元以及第一滤波器。
其中，第一滤波器在低频段呈现高阻抗、在高频段呈现低阻抗，且与可调器件并联，所以当天线工作在低频段时，接地点上的射频电流受滤波器的高阻抗阻隔，只能从可调器件支路流通，而当工作在高频段时，由于滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动也会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
因此，上述第一滤波器的设置可以达到在低频调谐时，高频阻抗基本保持同一的状态，解决了天线系统为低频带宽调谐时，高频阻抗受牵连而无序变化的问题。
进一步的，在天线本体上设置寄生单元可以增加天线的工作带宽，还可以对某个阻抗谐振形成容性加载，从而起到降低工作频点的作用，因此，将第一滤波器设置在寄生单元上，能够在调谐低频谐振的同时，不影响高频的宽带谐振特性。
本发明实施例提供一种天线系统，参见图15，示出了天线系统的一种结构示意图。天线系统包括天线本体100，可调器件200，第二滤波器400，寄生单元500。
第二滤波器400在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，其中，第二滤波器400的第一端通过寄生单元500与天线本体100连接，第二滤波器400的第二端与可调器件200连接。
可调器件200依次通过第二滤波器400、寄生单元500与天线本体100连接。
与上述实施例不同的是，本发明实施例设置了寄生单元500，寄生单元500与天线本体100没有物理上的连接，但存在电磁场的耦合作用，通过调节寄生单元的结构可以改变天线本体主干分支在某些频段的工作特性。若把可调器件连接在寄生单元上，可以不需要改变寄生单元的结构，就能够改变寄生单元与主干分支的耦合量，从而改变天线的工作特性。进一步的，寄生单元可以增加天线的工作带宽，对某个阻抗谐振形成容性加载从而降低工作频点。
其中，第二滤波器400在低频段呈现低阻抗、在高频段呈现高阻抗，且 串联接在天线本体与可调器件之间，所以当天线工作在低频段时，接地点上射频电流不受滤波器的影响，直接连通到可调器件，而当天线工作在高频段时，滤波器的高阻特性阻断射频电流连通到可调器件，此条通路相当于断开的状态，于是可调器件的状态变化就不会影响到天线接地点的电流流动，保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
进一步的，在天线本体上设置寄生单元可以增加天线的工作带宽，还可以对某个阻抗谐振形成容性加载，从而起到降低工作频点的作用，因此，将第一滤波器设置在寄生单元上，能够在调谐低频谐振的同时，不影响高频的宽带谐振特性。
本发明实施例提供一种天线系统，参见图16，示出了天线系统的一种结构示意图。天线系统包括天线本体100，可调器件200，第一滤波器300，第二滤波器400，寄生单元500。
第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性。第一滤波器300的第一端通过寄生单元500与天线本体100连接，第一滤波器300与可调器件并联。
第二滤波器400在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且串联接在天线本体走线上的寄生单元500与可调器件200之间。，其中，第二滤波器400的第一端通过寄生单元500与天线本体100连接，第二滤波器400的第二端与可调器件200连接。可调器件200依次通过第二滤波器400、寄生单元500与天线本体100连接。
与上述实施例不同的是，本发明实施例设置了寄生单元500，寄生单元500与天线本体100没有物理上的连接，但存在电磁场的耦合作用，通过调节寄生单元的结构可以改变天线本体主干分支在某些频段的工作特性。若把可调器件连接在寄生单元上，可以不需要改变寄生单元的结构，就能够改变寄生单元与主干分支的耦合量，从而改变天线的工作特性。进一步的，寄生单元可以增加天线的工作带宽，对某个阻抗谐振形成容性加载从而降低工作频点。
其中，第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗热性，且串联接在天线本体与可调器件之间，第一滤波器在低频段呈现高阻抗、在高频段呈现低阻抗，且并联接在第二滤波器与可调器件串联通路的旁路上。所以当天线工作在低频段时，接地点上的射频电流受第一滤波器的高阻抗阻 隔，只能从第二滤波器与可调器件构成的串联通路流通，而第二滤波器在低频呈现低阻抗，所以射频电流不受第二滤波器的影响，直接连通到可调器件。而当天线工作在高频段时，由于第一滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从第一滤波器支路连通到接地点，同时第二滤波器呈现的是高阻抗，阻断射频电流连通到可调器件，进一步保障了射频电流只能从第一滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
进一步的，在天线本体上设置寄生单元可以增加天线的工作带宽，还可以对某个阻抗谐振形成容性加载，从而起到降低工作频点的作用，因此，将第一滤波器设置在寄生单元上，能够在调谐低频谐振的同时，不影响高频的宽带谐振特性。
本发明实施例提供一种天线系统，参见图17，示出了天线系统的一种结构示意图，天线系统包括：
IFA天线本体110、可调器件200，寄生单元500以及第一滤波器300。
第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件200并联。
可调器件200通过寄生单元500与IFA天线本体110连接。
第一滤波器300的第一端通过寄生单元500与IFA天线本体110连接，第一滤波器300的第二端与地连接。
IFA(Inverted-F Antenna；倒F天线)是电小天线中的一种，IFA有一条连通信号的激励点111，还有一条或多条接地点112，接地点用于天线的阻抗调谐，利于与板上射频馈线的阻抗匹配。
第一滤波器300可以包括单颗电容，或者，第一滤波器300可以包括电感电容组成的LC网络，其中，L表示电感、C表示电容。LC网络表示用电感、电容搭建起来的滤波器电路网络。图5示出了电感电容组成的LC网络的一种结构示意图；图6示出了电感电容组成的LC网络的另一种结构示意图；图7示出了第一滤波器300为单颗电容的一种示意图。
可调器件200包括开关，和/或，可调电容，和/或，Pin二极管。
第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，与可调器件并联接在寄生单元500上，所以当天线工作在低频段时，寄生单 元上的射频电流受滤波器的高阻抗阻隔，只能从可调器件支路流通，而当工作在高频段时，由于滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动也会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
本发明实施例提供一种天线系统，参见图18，示出了天线系统的一种结构示意图，天线系统包括：
IFA天线本体110、可调器件200，寄生单元500以及第二滤波器400。
第二滤波器400在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，其中，第二滤波器400的第一端通过寄生单元500与IFA天线本体110连接，第二滤波器400的第二端与可调器件200连接，第二滤波器400串联接在寄生单元500与可调器件200之间。
其中，可调器件200包括开关，和/或，可调电容，和/或，Pin二极管。
第二滤波器400可以包括单颗电感，或者，第二滤波器400可以包括电感电容组成的LC网络。
第二滤波器400在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且串联接在寄生单元与可调器件之间，所以当天线工作在低频段时，寄生单元上的射频电流不受滤波器的影响，直接连通到可调器件，而当天线工作在高频段时，滤波器的高阻特性阻断射频电流连通到可调器件，此条通路相当于断开的状态，于是可调器件的状态变化就不会影响到天线寄生单元上的电流流动，保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
本发明实施例提供一种天线系统，参见图19，示出了天线系统的一种结构示意图，天线系统包括：
Monopole天线本体120、可调器件200，寄生单元500以及第一滤波器300。
Monopole天线又称单极子天线，是电小天线的一种，与IFA天线相比，主要差异点是，Monopole天线没有IFA天线的接地点112，没有通过可调器件连通到地的接地点，也没有通过第一滤波器、第二滤波器连通到地的接地点。
第一滤波器300与可调器件200并联，第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性。
可调器件200通过寄生单元500与Monopole天线本体120连接。
第一滤波器300的第一端通过寄生单元500与Monopole天线本体120连接。
第一滤波器300可以包括单颗电容，或者，第一滤波器300可以包括电感电容组成的LC网络。
可调器件200包括开关，和/或，可调电容，和/或，Pin二极管。
第一滤波器300在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件并联，所以当天线工作在低频段时，接地点上的射频电流受滤波器的高阻抗阻隔，只能从可调器件支路流通，而当工作在高频段时，由于滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动也会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
进一步的，在Monopole天线本体120上设置寄生单元可以增加天线的工作带宽，还可以对某个阻抗谐振形成容性加载，从而起到降低工作频点的作用，因此，将第一滤波器设置在寄生单元上，能够在调谐低频谐振的同时，不影响高频的宽带谐振特性。
本发明实施例提供一种天线系统，参见图20，示出了天线系统的一种结构示意图，天线系统包括：
Monopole天线本体120、可调器件200，寄生单元500以及第二滤波器400。
第二滤波器400在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，其中，第二滤波器400的第一端通过寄生单元500与Monopole天线本体120连接，第二滤波器400的第二端与可调器件200连接。
可调器件200依次通过第二滤波器400、寄生单元500与Monopole天线本体120连接。
其中，可调器件200包括开关，或，可调电容，或，Pin二极管。
第二滤波器400可以包括单颗电感，或者，第一滤波器300可以包括电感电容组成的LC网络。
第二滤波器400在低频段呈现低阻抗、在高频段呈现高阻抗，且串联接在天线本体与可调器件之间，所以当天线工作在低频段时，接地点上射频电 流不受滤波器的影响，直接连通到可调器件，而当天线工作在高频段时，滤波器的高阻特性阻断射频电流连通到可调器件，此条通路相当于断开的状态，于是可调器件的状态变化就不会影响到天线接地点的电流流动，保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
进一步的，在Monopole天线本体120上设置寄生单元可以增加天线的工作带宽，还可以对某个阻抗谐振形成容性加载，从而起到降低工作频点的作用，因此，将第一滤波器设置在寄生单元上，能够在调谐低频谐振的同时，不影响高频的宽带谐振特性。
需要补充的是，上述实施例中的天线本体不限于IFA天线，或，Monopole天线，其他天线形式也可以，在此不做限定。
参见图23，本发明实施例还提供一种终端，包括天线系统，天线系统包括天线本体，可调器件，第一滤波器和/或第二滤波器；
天线本体与可调器件连接；
第一滤波器与可调器件并联，第一滤波器在在低频段呈现高阻抗特性、在高频段呈现低阻抗特性；
第二滤波器串联接在天线本体与可调器件之间，其中，第二滤波器的第一端与天线本体连接，第二滤波器的第二端与可调器件连接。第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且
其中，第一滤波器在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件并联，所以当天线工作在低频段时，接地点上的射频电流受滤波器的高阻抗阻隔，只能从可调器件支路流通，而当工作在高频段时，由于滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动也会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
或者，还可以设置第二滤波器，第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且串联接在天线本体与可调器件之间，所以当天线工作在低频段时，接地点上射频电流不受滤波器的影响，直接连通到可调器件，而当天线工作在高频段时，滤波器的高阻特性阻断射频电流连通到可调器件，此条通路相当于断开的状态，于是可调器件的状态变化就不会影响到天线接地点的电流流动，保证了可调器件的变化只作用到低频段，而对高 频影响大幅减弱。
或者，还可以同时设置第一滤波器以及第二滤波器。第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性，且串联接在天线本体与可调器件之间，第一滤波器在低频段呈现高阻抗特性、在高频段呈现低阻抗特性，且与可调器件并联。所以当天线工作在低频段时，接地点上的射频电流受第一滤波器的高阻抗阻隔，只能从第二滤波器与可调器件构成的串联通路流通，而第二滤波器在低频呈现低阻抗，所以射频电流不受第二滤波器的影响，直接连通到可调器件。而当天线工作在高频段时，由于第一滤波器呈现低阻抗，相当于直通到接地点，所以射频电流主要从第一滤波器支路连通到接地点，同时第二滤波器呈现的是高阻抗，阻断射频电流连通到可调器件，进一步保障了射频电流只能从第一滤波器支路连通到接地点，此时，即使可调器件支路发生状态变化，对高频电流的扰动会很小，从而保证了可调器件的变化只作用到低频段，而对高频影响大幅减弱。
在LTE-4G天线宽频带的可调技术中，可调器件的每一个状态对应覆盖天线的一段频带，当天线在某一频段工作时，其他频率上的性能可以忽略，也就是说，如果天线当前在低频段工作，此时天线在高频段的性能可以忽略，因为整个终端只工作在低频段。但在LTE-4G演进出载波聚合技术后，终端系统可以同时在低、高等两个频段工作，由于终端系统需要通过增加频谱宽度来提升无线网络的带宽，于是天线就需要在指定的低频和高频两个频段同时保持好的性能。而目前的天线系统要用一个可调器件的状态就使得天线在低频和高频都出现好的性能，工程难度较大，而本发明降低了工程难度，在天线系统中设置了第一滤波器和/或第二滤波器，且对第一滤波器、第二滤波器的特性进行了设置，由上述可知，第一滤波器和/或第二滤波器的设置可以达到在低频调谐时，高频阻抗基本保持同一的状态，解决了终端中天线系统为低频带宽调谐时，高频阻抗受牵连而无序变化的问题。
优选的，在上述终端中，天线系统包括天线本体，可调器件，第一滤波器，还包括寄生单元；
可调器件通过寄生单元与天线本体连接；
第一滤波器的第一端通过寄生单元与天线本体连接。
优选的，在上述终端中，天线系统包括天线本体，可调器件，第二滤波器，还包括寄生单元；
第二滤波器的第一端通过寄生单元与天线本体连接；
可调器件依次通过第二滤波器、寄生单元与天线本体连接。
优选的，在上述终端中，天线系统包括天线本体，可调器件，第一滤波器，第二滤波器，还包括寄生单元；
第一滤波器的第一端通过寄生单元与天线本体连接；
第二滤波器的第一端通过寄生单元与天线本体连接；
可调器件依次通过第二滤波器、寄生单元与天线本体连接。
优选的，在上述终端中，
第一滤波器为单颗电容，或，电感电容组成的LC网络。
优选的，在上述终端中，
第二滤波器为单颗电感、或，电感电容组成的LC网络。
优选的，在上述终端中，
天线本体为IFA天线，或，Monopole天线。
需要说明的是，终端中天线系统的结构图可参考上述天线实施例中的附图，在此不做重复。
本领域技术人员可以理解附图只是一个优选实施例的示意图，附图中的模块并不一定是实施本发明所必须的。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (14)

  1. 一种天线系统，其特征在于，包括：
    天线本体，可调器件，第一滤波器和/或第二滤波器；
    所述天线本体与所述可调器件连接；
    所述第一滤波器与所述可调器件并联，所述第一滤波器在在低频段呈现高阻抗特性、在高频段呈现低阻抗特性；
    所述第二滤波器串联接在所述天线本体与所述可调器件之间，所述第二滤波器的第一端与所述天线本体连接，所述第二滤波器的第二端与所述可调器件连接，所述第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性。
  2. 根据权利要求1所述的天线系统，其特征在于，所述天线系统包括所述天线本体，所述可调器件，所述第一滤波器，还包括寄生单元；
    所述可调器件通过所述寄生单元与所述天线本体连接；
    所述第一滤波器的第一端通过所述寄生单元与所述天线本体连接。
  3. 根据权利要求1所述的天线系统，其特征在于，所述天线系统包括所述天线本体，所述可调器件，所述第二滤波器，还包括寄生单元；
    所述第二滤波器的第一端通过所述寄生单元与所述天线本体连接；
    所述可调器件依次通过所述第二滤波器、所述寄生单元与所述天线本体连接。
  4. 根据权利要求1所述的天线系统，其特征在于，所述天线系统包括所述天线本体，所述可调器件，所述第一滤波器，所述第二滤波器，还包括寄生单元；
    所述第一滤波器的第一端通过所述寄生单元与所述天线本体连接；
    所述第二滤波器的第一端通过所述寄生单元与所述天线本体连接；
    所述可调器件依次通过所述第二滤波器、所述寄生单元与所述天线本体连接。
  5. 根据权利要求2或4所述的天线系统，其特征在于，
    所述第一滤波器为单颗电容，或，电感电容组成的LC网络。
  6. 根据权利要求3或4所述的天线系统，其特征在于，
    所述第二滤波器为单颗电感、或，电感电容组成的LC网络。
  7. 根据权利要求1-6任一所述的天线系统，其特征在于，
    所述天线本体为IFA天线，或，Monopole天线。
  8. 一种终端，其特征在于，包括天线系统，所述天线系统包括天线本体，可调器件，第一滤波器和/或第二滤波器；
    所述天线本体与所述可调器件连接；
    所述第一滤波器与所述可调器件并联，所述第一滤波器在在低频段呈现高阻抗特性、在高频段呈现低阻抗特性；
    所述第二滤波器串联接在所述天线本体与所述可调器件之间，所述第二滤波器的第一端与所述天线本体连接，所述第二滤波器的第二端与所述可调器件连接，所述第二滤波器在低频段呈现低阻抗特性、在高频段呈现高阻抗特性。
  9. 根据权利要求8所述的终端，其特征在于，所述天线系统包括所述天线本体，所述可调器件，所述第一滤波器，还包括寄生单元；
    所述可调器件通过所述寄生单元与所述天线本体连接；
    所述第一滤波器的第一端通过所述寄生单元与所述天线本体连接。
  10. 根据权利要求8所述的终端，其特征在于，所述天线系统包括所述天线本体，所述可调器件，所述第二滤波器，还包括寄生单元；
    所述第二滤波器的第一端通过所述寄生单元与所述天线本体连接；
    所述可调器件依次通过所述第二滤波器、所述寄生单元与所述天线本体连接。
  11. 根据权利要求8所述的终端，其特征在于，所述天线系统包括所述天线本体，所述可调器件，所述第一滤波器，所述第二滤波器，还包括寄生单元；
    所述第一滤波器的第一端通过所述寄生单元与所述天线本体连接；
    所述第二滤波器的第一端通过所述寄生单元与所述天线本体连接；
    所述可调器件依次通过所述第二滤波器、所述寄生单元与所述天线本体连接。
  12. 根据权利要求9或11所述的终端，其特征在于，
    所述第一滤波器为单颗电容，或，电感电容组成的LC网络。
  13. 根据权利要求10或11所述的天线系统，其特征在于，
    所述第二滤波器为单颗电感、或，电感电容组成的LC网络。
  14. 根据权利要求8-13任一所述的终端，其特征在于，
    所述天线本体为IFA天线，或，Monopole天线。
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US11949172B2 (en) 2024-04-02
CN110299618B (zh) 2022-09-30
US20170012357A1 (en) 2017-01-12
US10411354B2 (en) 2019-09-10
US20190356052A1 (en) 2019-11-21
CN103794871A (zh) 2014-05-14

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