CN112397902B - Antenna, impedance matching method thereof and terminal - Google Patents

Antenna, impedance matching method thereof and terminal Download PDF

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Publication number
CN112397902B
CN112397902B CN202011148347.2A CN202011148347A CN112397902B CN 112397902 B CN112397902 B CN 112397902B CN 202011148347 A CN202011148347 A CN 202011148347A CN 112397902 B CN112397902 B CN 112397902B
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impedance
frequency band
antenna
antenna radiator
matching circuit
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CN112397902A (en
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刘友文
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/10—Resonant antennas
    • 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
    • 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
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation

Abstract

The application discloses an antenna, an impedance matching method and a terminal thereof, wherein the antenna comprises an antenna radiator, an antenna feeder and an impedance matching circuit connected between the antenna radiator and the antenna feeder; the antenna radiator is used for receiving or transmitting signals of a first frequency band and/or signals of a second frequency band, and the center frequency of the first frequency band is higher than that of the second frequency band; the impedance matching circuit comprises a first matching circuit and an LC parallel resonant circuit, the first matching circuit is connected with the LC parallel resonant circuit in series, and the resonant frequency of the LC parallel resonant circuit is smaller than the center frequency of the first frequency band and larger than the center frequency of the second frequency band; the first matching circuit is matched with the LC parallel resonant circuit and is used for matching the impedance of the impedance matching circuit with the first impedance and/or the second impedance; the first impedance is the impedance of the antenna radiator working in the first frequency band, and the second impedance is the impedance of the antenna radiator working in the second frequency band.

Description

Antenna, impedance matching method thereof and terminal
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to an antenna, an impedance matching method thereof and a terminal.
Background
For terminals such as mobile phones, the whole space of the terminal product is limited, and the space reserved for the antenna is small, so that the multi-band shared antenna becomes a trend.
For a multi-band common antenna, the impedance matching network is commonly used, and the reactance values formed by the capacitance and the inductance in the impedance matching network at different frequencies are different, so that the impedance of the impedance matching network and the impedance of the antenna radiator are easily mismatched.
Disclosure of Invention
The embodiment of the application provides an antenna, an impedance matching method thereof and a terminal.
In a first aspect, there is provided an antenna comprising: an antenna radiator, an antenna feeder, and an impedance matching circuit connected between the antenna radiator and the antenna feeder;
the antenna radiator is used for receiving or transmitting signals of a first frequency band and/or signals of a second frequency band, and the center frequency of the first frequency band is higher than that of the second frequency band;
the impedance matching circuit comprises a first matching circuit and an LC parallel resonant circuit, wherein the first matching circuit is connected with the LC parallel resonant circuit in series, and the resonant frequency of the LC parallel resonant circuit is smaller than the center frequency of the first frequency band and larger than the center frequency of the second frequency band;
The first matching circuit is matched with the LC parallel resonant circuit and is used for matching the impedance of the impedance matching circuit with the first impedance and/or the second impedance; the first impedance is the impedance of the antenna radiator working in the first frequency band, and the second impedance is the impedance of the antenna radiator working in the second frequency band.
In a second aspect, an impedance matching method of an antenna is provided, including:
the capacitance value of a second capacitor and the inductance value of a second inductor in the LC parallel resonance circuit are regulated, so that the resonance frequency of the LC parallel resonance circuit is smaller than the frequency of the first frequency band and larger than the frequency of the second frequency band; wherein the antenna comprises an impedance matching circuit comprising a first matching circuit and the LC parallel resonant circuit; the first frequency band is higher than the second frequency band;
the capacitance value of the second capacitor is adjusted, so that the LC parallel resonant circuit is matched with the first matching circuit, and the impedance of the impedance matching circuit is matched with first impedance, wherein the first impedance is the impedance of an antenna radiator in the antenna under the first frequency band;
And adjusting the inductance value of the second inductor to enable the LC parallel resonant circuit to be matched with the first matching circuit, so that the impedance of the impedance matching circuit is matched with second impedance, and the second impedance is the impedance of the antenna radiator working in the second frequency band.
In a third aspect, a terminal is provided, including: the antenna described above.
In this embodiment of the present invention, since the impedance matching circuit includes a first matching circuit and an LC parallel resonant circuit, the resonant frequency of the LC parallel resonant circuit is smaller than the center frequency of the first frequency band and larger than the center frequency of the second frequency band, so that the LC parallel resonant circuit is capacitive, the impedance of the impedance matching circuit can be matched with the first impedance by adjusting the capacitance of the LC parallel resonant circuit, and the LC parallel resonant circuit is inductive, the impedance of the impedance matching circuit can be matched with the second impedance by adjusting the inductance of the LC parallel resonant circuit, and then the impedance of the antenna radiator in the first frequency band and the second frequency band can be easily matched with the impedance of the impedance matching circuit by the effect of the LC parallel resonant circuit.
Drawings
Fig. 1 is a schematic structural diagram of a middle frame of a terminal provided in the related art;
fig. 2 is a schematic structural diagram of an antenna according to an embodiment of the present application;
fig. 3 is a schematic diagram of an impedance characteristic of an LC parallel resonant circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another antenna according to an embodiment of the present application;
fig. 5a is a schematic structural diagram of another middle frame of a terminal according to an embodiment of the present application;
fig. 5b is a schematic structural diagram of another antenna according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of radiation efficiency curves of an antenna according to an embodiment of the present application;
fig. 7a is a schematic diagram of a position of a conductive element on an antenna radiator according to an embodiment of the present disclosure;
fig. 7b is a schematic diagram illustrating a position of another conductive element on an antenna radiator according to an embodiment of the present disclosure;
fig. 7c is a schematic view illustrating a position of a conductive element on an antenna radiator according to an embodiment of the present disclosure;
fig. 7d is a schematic diagram illustrating a position of a conductive element on an antenna radiator according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of a radiation efficiency curve of another antenna according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of the locations of the electric field points and weak electric field points of an antenna radiator according to an embodiment of the present application;
Fig. 10 is a flow chart of an impedance matching method of an antenna according to an embodiment of the present application;
fig. 11 is a flowchart of another impedance matching method of an antenna according to an embodiment of the present application.
Detailed Description
The technical solutions of the present application will be specifically described below by way of examples and with reference to the accompanying drawings. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
It should be noted that: in the examples of this application, "first," "second," etc. are used to distinguish similar objects and not necessarily to describe a particular order or precedence.
In addition, the embodiments described in the present application may be arbitrarily combined without any collision.
In current mobile phones, an antenna is generally disposed on a side of the mobile phone, for example, the mobile phone generally includes a front case and a rear case, and a middle frame disposed between the front case and the rear case, the front case generally includes a display module, a front camera, and the rear case generally includes a rear camera, a cover, and the like, and the antenna is generally designed at a top end or a left side area or a right side area of the middle frame.
Fig. 1 is a schematic structural diagram of a middle frame of a terminal provided by the related art, where an antenna in a middle frame 101 shown in fig. 1 (a) is a first type of multiband multiplexing antenna, for example, the first type of multiband multiplexing antenna is an antenna shared by an L5 band, a wireless fidelity (Wireless Fidelity, WIFI) 2.4G band and a WIFI 5G band, and an antenna in a middle frame 101 shown in fig. 1 (b) is a second type of multiband multiplexing antenna, for example, the second type of multiband multiplexing antenna is an antenna shared by an n28 band, a WIFI 2.4G band and a WIFI 5G band. One end of the antenna radiator 102 shown in fig. 1 (a) and 1 (b) is Grounded (GND), the other end is a feed end (Fed), and the feed end of the antenna radiator 102 is connected to an impedance matching circuit, the matching circuit in fig. 1 (a) is a first impedance matching circuit 1011 corresponding to an L5 frequency band, a WIFI 2.4G frequency band, and a WIFI 5G frequency band, and the matching circuit in fig. 1 (b) is a second impedance matching circuit 1012 corresponding to an n28 frequency band, a WIFI 2.4G frequency band, and a WIFI 5G frequency band. Length of the antenna radiator 102 in order to match the operating frequency band, the antenna radiator 102 in the L5 frequency band and the n28 frequency band generally have different lengths, and the length of the radiator corresponding to the L5 frequency band is smaller than the length of the radiator corresponding to the n28 frequency band, and the length L1 of the antenna radiator 102 shown in fig. 1 (a) is smaller than the length L2 of the antenna radiator 102 shown in fig. 1 (b). Since the L5 frequency band is 1165MHz-1185MHz, the n28 frequency band is 760MHz-802MHz, and the L5 frequency band and the n28 frequency band are similar, the same antenna form, such as a capacitive feed form, can be adopted. Because the lengths of the antenna radiator 102 that are matched in different operating frequency bands are different, in order to enable the impedance matching circuit of the antenna to match the impedance of the antenna radiator 102, two borders of the mobile phone are generally required to be designed to adapt to the impedance requirements in different frequency bands. For example, since the lengths of the antenna radiator 102 corresponding to the L5 band and the antenna radiator 102 corresponding to the n28 band are different, a technician is required to design two different antenna radiators 102, resulting in an increase in the cost of the antenna design.
In addition, the technicians also find that the frequency multiplication in the L5 frequency band or the frequency multiplication in the n28 frequency band easily falls into the WIFI 5G frequency band, so that the radiation efficiency of the WIFI 5G can be reduced.
Based on the problems, the novel impedance matching circuit is provided, so that the first multi-band multiplexing antenna and the second multi-band multiplexing antenna share one antenna radiator, and only through the matching circuits with two different circuit parameters, the impedance matching between the impedance matching circuit and the antenna radiator can be easily realized, so that the design requirements of the two antennas are met under the condition of using the two different matching circuits, and the design cost of the antenna is reduced. In addition, the application also provides a method for eliminating the low-frequency multiple frequency influence by using the capacitive loading of the metal structure.
Fig. 2 is a schematic structural diagram of an antenna according to an embodiment of the present application, and as shown in fig. 2, an antenna 200 includes: an antenna radiator 201, an antenna feeder 202, and an impedance matching circuit 203 connected between the antenna radiator 201 and the antenna feeder 202.
The antenna feed 202 refers to a transmission line connecting the antenna to the transceiver for transmitting radio frequency energy. The characteristic impedance of the antenna feed 202 is typically a 50 ohm or other impedance coaxial cable feed.
And the antenna radiator 201 is configured to receive or transmit a signal in a first frequency band and/or a signal in a second frequency band, where a center frequency of the first frequency band is higher than a center frequency of the second frequency band.
The antenna radiator 201 may be an active radiator. In general, the input impedance of the antenna radiator 201 is complex, and the input impedance of the antenna radiator 201 may be related to at least one factor of the geometry, size, feeding point position, operating wavelength, and surrounding environment of the antenna radiator 201. When the antenna radiator 201 is matched to the antenna feed 202, the power transmitted by the transmitter to the antenna radiator 201 or by the antenna radiator 201 to the receiver is maximized. In order to match the antenna radiator 201 with the antenna feed line 202, it is most common to construct a matching network (e.g., an impedance matching circuit 203) between the antenna radiator 201 and the antenna feed line 202, such that the impedance of the matching network matches the impedance of the antenna radiator 201, e.g., the impedance of the matching network is equal to the conjugate of the impedance of the antenna radiator 201, i.e., the sum of the impedance of the matching network and the impedance of the antenna radiator 201 is the characteristic impedance (e.g., 50 ohms) of the antenna feed line 202.
The antenna radiator 201 of the present embodiment may be a Loop (Loop) radiator. The antenna radiator 201 may include a first radiating arm at an outer surface of the terminal, a second radiating arm disposed inside the terminal, a third radiating arm connected to one end of the first radiating arm and one end of the second radiating arm, and a fourth radiating arm connected to the other end of the first radiating arm and the other end of the second radiating arm, wherein the first radiating arm and the second radiating arm are disposed opposite to each other. The second radiating arm may be provided with a ground terminal for grounding and a feeder terminal for connecting the impedance matching circuit 203. In other embodiments, the antenna radiator 201 may be a bent radiator, an inverted F-shaped structure, or a combination of at least two radiators of other shapes.
At least one of the first frequency band, the second frequency band and the third frequency band described below may be a WIFI frequency band, an internet of things frequency band, a 4G frequency band, a 5G frequency band, or a 6G frequency band divided later, or other frequency bands. The difference between the center frequency point of the first frequency band and the center frequency point of the second frequency band may be 1000MHz. For example, the first frequency band may be a WIFI 5GHz frequency band, the second frequency band may be a WIFI 2.4GHz frequency band, and for another example, the first frequency band may be an N79 frequency band (4800 MHz-4900 MHz), and the second frequency band may be an N78 frequency band (3400 MHz-3600 MHz). The embodiments of the present application are not limited to the implementation of the first frequency band and the second frequency band.
The length of the antenna radiator 201 may be greater than or equal to 1/4 of the wavelength corresponding to the center frequency band of the second frequency band.
The impedance matching circuit 203 includes a first matching circuit 2031 and an LC parallel resonant circuit 2032, wherein the first matching circuit 2031 is connected in series with the LC parallel resonant circuit 2032, and the resonant frequency of the LC parallel resonant circuit 2032 is smaller than the center frequency of the first frequency band and larger than the center frequency of the second frequency band.
Wherein the first matching circuit 2031 and the LC parallel resonant circuit 2032 cooperate with each other for matching the impedance of the impedance matching circuit 203 with the first impedance and/or the second impedance; the first impedance is an impedance of the antenna radiator 201 operating in the first frequency band, and the second impedance is an impedance of the antenna radiator 201 operating in the second frequency band.
In the manufacturing process of the antenna, the antenna needs to be debugged, and the specific debugging method comprises the following steps: the circuit parameters of the impedance matching circuit 203 are changed such that the impedance of the impedance matching circuit 203 matches or conjugates the impedance of the antenna radiator 201 operating in multiple frequency bands. In the antenna of the embodiment of the present application, the impedance of the impedance matching circuit 203 is matched with the first impedance/the second impedance/the third impedance described below. An embodiment in which the impedance of the impedance matching circuit 203 matches the first impedance/the second impedance/the third impedance described below may be: the sum of the impedance matching circuit 203 and the first impedance/second impedance/third impedance is 50 ohms.
In tuning the antenna, the first matching circuit 2031 and the LC parallel resonant circuit 2032 are used to adjust the impedance of the impedance matching circuit 203 to match the impedance of the antenna radiator 201 operating in the first frequency band and/or the second frequency band. The LC parallel resonant circuit 2032 may be used for coarse tuning the impedance of the impedance matching circuit 203, and the first matching circuit 2031 may be used for fine tuning the impedance of the impedance matching circuit 203.
In the embodiment shown in fig. 2, the LC parallel resonant circuit 2032 is connected to the antenna radiator 201, and the first matching circuit 2031 is connected to the antenna feeder 202. In other embodiments, LC parallel resonant circuit 2032 may be connected to antenna feed 202 and first matching circuit 2031 may be connected to antenna radiator 201.
The first matching circuit 2031 may include one of: l-shaped matching circuit, T-shaped matching circuit and pi-shaped matching circuit. The first matching circuit 2031 may be used to adjust the impedance of the antenna radiator 201 operating in the first frequency band and/or the second frequency band.
The resonance frequency of the LC parallel resonant circuit 2032 can be calculated by the following formula (1):
Figure BDA0002740379770000071
where f is the resonant frequency of LC parallel resonant circuit 2032, L is the inductance value of the inductance in LC parallel resonant circuit 2032, and C is the capacitance value of the capacitance in LC parallel resonant circuit 2032.
The impedance of the LC parallel resonant circuit 2032 can be calculated by the following equation (2):
Figure BDA0002740379770000072
where z is the impedance of LC parallel resonant circuit 2032, w is the angular frequency of LC parallel resonant circuit 2032, C is the capacitance value of the capacitance in LC parallel resonant circuit 2032, and L is the inductance value of the inductance in LC parallel resonant circuit 2032.
Fig. 3 is a schematic diagram of an impedance characteristic of an LC parallel resonant circuit according to an embodiment of the present application, as shown in fig. 3, when the LC parallel resonant circuit 2032 operates at a resonant frequency f 0 When the resonance frequency is one of a frequency smaller than the center frequency of the first frequency Band and larger than the center frequency of the second frequency Band, the impedance of the LC parallel resonant circuit 2032 tends to infinity, and the LC parallel resonant circuit assumes a Band-Stop (Stop Band) state, or an open state, or LC parallel resonant circuit 2032.
When adjusting the impedance matching of the antenna radiator 201 in the first frequency band, since the LC parallel resonant circuit 2032 is inductive in the first frequency band, sensitive to a change in the inductance value, and insensitive to a change in the capacitance value, the impedance of the impedance matching circuit 203 can be matched with the impedance of the antenna radiator 201 operating in the first frequency band by adjusting the inductance value of the LC parallel resonant circuit 2032. When adjusting the impedance matching of the antenna radiator 201 in the second frequency band, since the LC parallel resonant circuit 2032 is capacitive in the second frequency band, sensitive to a change in capacitance value, and insensitive to a change in inductance value, the impedance of the impedance matching circuit 203 can be matched with the impedance of the antenna radiator 201 operating in the second frequency band by adjusting the capacitance value of the LC parallel resonant circuit 2032.
It should be understood that, although the impedance matching circuit 203 is described in the embodiment of the present application as matching the first impedance/the second impedance/the third impedance described below: although the impedance of the impedance matching circuit 203 is conjugated or added to the first impedance/second impedance/third impedance described below to be 50 ohms, in practical applications, it is difficult to achieve the conjugation or addition of 50 ohms between the impedance of the impedance matching circuit 203 and the first impedance/second impedance/third impedance described below due to the influence of product manufacturing or environmental factors, and therefore, in the case where the imaginary part of the impedance matching circuit 203 and the imaginary part of the first impedance/second impedance/third impedance described below is added to be close to zero or the addition result is close to 50 ohms, it is also considered that the impedance of the impedance matching circuit 203 and the first impedance/second impedance/third impedance described below are matched.
In this embodiment, since the impedance matching circuit 203 includes the first matching circuit 2031 and the LC parallel resonant circuit 2032, the resonant frequency of the LC parallel resonant circuit 2032 is smaller than the center frequency of the first frequency band and larger than the center frequency of the second frequency band, so that the LC parallel resonant circuit 2032 is capacitive in the case where the antenna radiator 201 transmits and receives signals of the first frequency band, the impedance of the impedance matching circuit 203 can be matched with the first impedance by adjusting the capacitance of the LC parallel resonant circuit 2032, and the LC parallel resonant circuit 2032 is inductive in the case where the antenna radiator 201 transmits and receives signals of the second frequency band, the impedance of the impedance matching circuit 203 can be matched with the second impedance by adjusting the inductance of the LC parallel resonant circuit 2032, and then the impedance of the antenna radiator 201 in the first frequency band and the second frequency band can be easily matched with the impedance of the impedance matching circuit 203 by the effect of the LC parallel resonant circuit 2032.
Fig. 4 is a schematic structural diagram of another antenna according to an embodiment of the present application, as shown in fig. 4, the antenna 200 includes: an antenna radiator 201, an antenna feeder 202, and an impedance matching circuit 203 connected between the antenna radiator 201 and the antenna feeder 202.
The impedance matching circuit 203 includes: the first matching circuit 2031, the LC parallel resonant circuit 2032, and the second matching circuit 2033 are sequentially connected in series in any order among the LC parallel resonant circuit 2032, the first matching circuit 2031, and the second matching circuit 2033. In the embodiment corresponding to fig. 4, one end of the LC parallel resonant circuit 2032 is connected to the antenna radiator 201, the other end is connected to one end of the second matching circuit 2033, the other end of the second matching circuit 2033 is connected to one end of the first matching circuit 2031, and the other end of the first matching circuit 2031 is connected to the antenna feeder 202. In other modes, the first matching circuit 2031, the LC parallel resonant circuit 2032, and the second matching circuit 2033 may be connected in series in other sequences, which is not limited in this application.
The antenna radiator 201 is further configured to receive or transmit a signal in a third frequency band, where a center frequency of the second frequency band is higher than a center frequency of the third frequency band, and a length of the antenna radiator 201 is greater than or equal to one quarter of a wavelength corresponding to the center frequency of the third frequency band.
A second matching circuit 2033 for matching the impedance of the impedance matching circuit 203 with a third impedance; the third impedance is the impedance of the antenna radiator 201 operating in the third frequency band.
In some embodiments, the third frequency band may be a global positioning system (Global Positioning System, GPS) L5 frequency band, with GPS L5 frequency bands 1165MHz-1185MHz. In other embodiments, the third frequency band may be the 5G n28 frequency band, with the 5G n28 frequency band being 760MHz-802MHz.
In some embodiments, the length of the antenna radiator 201 may be a specific length, which may be greater than or equal to: the larger one of 1/4 of the wavelength corresponding to the GPS L5 frequency band and 1/4 of the wavelength corresponding to the 5g n28 frequency band, that is, the antenna radiator 201 with a specific length in the embodiment of the present application may be applied to the case of sharing the GPS L5 frequency band, the WIFI 2.4GHz frequency band and the WIFI 5GHz frequency band, or may be applied to the case of sharing the n28 frequency band, the WIFI 2.4GHz frequency band and the WIFI 5GHz frequency band.
In the process of tuning the antenna, the second matching circuit 2033 is configured to adjust the impedance of the impedance matching circuit 203 to match the impedance of the antenna radiator 201 operating in the third frequency band. The second matching circuit 2033 has little or no influence on the degree of matching between the impedance of the impedance matching circuit 203 and the impedance of the antenna radiator 201 in the first frequency band and/or the second frequency band when the impedance of the impedance matching circuit 203 is adjusted, and the first matching circuit 2031 and the LC parallel resonant circuit 2032 have little or no influence on the degree of matching between the impedance of the impedance matching circuit 203 and the impedance of the antenna radiator 201 in the third frequency band when the impedance of the impedance matching circuit 203 is adjusted.
In some embodiments, the impedance of the antenna radiator 201 operating in the first frequency band or the second frequency band or the third frequency band may be an impedance of the antenna radiator 201 operating in the center frequency of the first frequency band or the center frequency of the second frequency band or the center frequency of the third frequency band.
In the embodiment of the application, the second matching circuit can enable the impedance of the impedance matching circuit to be matched with the impedance of the antenna radiator working in the third frequency band.
Fig. 5a is a schematic structural diagram of another middle frame of a terminal according to the embodiment of the present application, and referring to fig. 4 and fig. 5a, the length of an antenna radiator 201 in a middle frame 204 may be L3, L3 may be the same as the length of L2, or L3 may be greater than the length of L2, one end of the antenna radiator 201 is grounded, and the other end is connected to an impedance matching circuit 203 through a feed end (Fed), where when the antenna 200 is a first type of multiband multiplexing antenna, that is, when the antenna receives or transmits signals in L5 band, WIFI 2.4G band, and WIFI 5G band, the impedance matching circuit 203 may select the first impedance matching circuit 206; when the antenna 200 is a second type of multiband multiplexing antenna, i.e. when the terminal is configured to receive or transmit signals in the n28 band, the WIFI 2.4G band, and the WIFI 5G band, the impedance matching circuit 203 may select the second impedance matching circuit 207. In some embodiments, the circuit structures of the first impedance matching circuit 206 and the second impedance matching circuit 207 may be the same, and the circuit parameters of the first impedance matching circuit 206 and the second impedance matching circuit 207 may be different. In other embodiments, the structures of the first impedance matching circuit 206 and the second impedance matching circuit 207 may be different.
In some embodiments, in order to avoid the influence of the frequency multiplication of the L5 band or the frequency multiplication of the n28 band on the radiation efficiency of the WIFI5GHz band, a Metal step (Metal step) 205 may be added to the antenna radiator 201.
Fig. 5b is a schematic structural diagram of another antenna according to an embodiment of the present application, and as shown in fig. 5b, an impedance matching circuit 203 is connected in series between an antenna radiator 201 and an antenna feeder 202. The impedance matching circuit 203 may be the first impedance matching circuit described above.
Wherein the second matching circuit 2033 includes: a first capacitor C1 and a first inductance L1; one end of the first capacitor C1 is connected to the LC parallel resonant circuit 2032, and the other end of the first capacitor C1 is connected to the antenna feeder 202. In other embodiments, the other end of the first capacitor C1 is connected to the antenna feed 202 through the LC parallel resonant circuit 2032 and/or the second matching circuit 2033; one end of the first inductor L1 is connected to the LC parallel resonant circuit 2032, and the other end of the first inductor L1 is grounded.
The LC parallel resonant circuit 2032 includes a second capacitor C2 and a second inductance L2, one end of the second capacitor C2 is connected to the antenna radiator 201, the other end of the second capacitor C2 is connected to the second matching circuit 2033, one end of the second inductance L2 is connected to the antenna radiator 201, and the other end of the second inductance L2 is connected to the second matching circuit 2033. The other end of the second capacitor C2 is connected to the second matching circuit 2033, and the other end of the second capacitor C2 may be connected to one end of the first capacitor C1 in the second matching circuit 2033.
In some embodiments, the first matching circuit 2031 may include: the antenna matching circuit comprises a first resistor R1, a third capacitor C3 and a second resistor R2, wherein one end of the first resistor R1 is connected with a second matching circuit, the other end of the first resistor R1 is connected with one end of the second resistor R2, one end of the third capacitor C3 is connected with one end of the second resistor R2, the other end of the third capacitor C3 is grounded, and the other end of the second resistor R2 is connected with an antenna feeder 202, wherein the first matching circuit 2031 in the embodiment can be applied to an L5 antenna. One end of the first resistor R1 is connected to the second matching circuit 2033, and one end of the first resistor R1 may be connected to the other end of the first capacitor C1 in the second matching circuit 2033.
In some embodiments, the first resistor and the second resistor may have a resistance value of 0 ohms.
In other embodiments, the second resistor R2 in the first matching circuit 2031 may be replaced by a third inductor, where the other end of the first resistor R1 is connected to one end of the third inductor, one end of the third capacitor C3 is connected to one end of the third inductor, and the other end of the third inductor is connected to the antenna feeder 202, where such a first matching circuit 2031 may be used in an n28 antenna. The second resistor R2 in the first matching circuit 2031 may be the second impedance matching circuit described above, instead of the obtained impedance matching circuit with the third inductor.
In other embodiments, the other end of the first resistor may also be connected to a first end of a particular device, and a second end of the particular device is grounded. The specific device may be at least one of a capacitance, an inductance, and a resistance.
It is to be noted that, although two different first matching circuits 2031 are provided in the embodiment of the application, the embodiment of the application is not limited thereto as long as the first matching circuits 2031 can realize impedance adjustment of the impedance matching circuit 203 in cooperation with the LC parallel resonant circuit 2032.
In the embodiment of the application, by providing a specific circuit structure of the impedance matching circuit, the impedance of the impedance matching circuit can be matched with the impedance of the antenna radiator working in the first frequency band, the second frequency band and the third frequency band.
In the working process of the antenna, as the initial resonant frequency of the n28 antenna is generally between 0.7GHz and 0.75GHz, multiple frequency (for example, 7 times frequency) of the initial resonant frequency can appear in the WIFI 5GHz frequency band, so that the radiation efficiency of the antenna when working in the WIFI 5GHz frequency band is reduced.
For example, fig. 6 is a schematic diagram of radiation efficiency curves of an antenna provided in this embodiment, as shown in fig. 6, 7 times of n28 frequency band may fall into WIFI 5GHz frequency band, so that 7 times of n28 may affect radiation efficiency of the antenna operating in WIFI 5GHz frequency band, resulting in radiation efficiency pits caused by 7 times of n28 frequency band may appear in WIFI 5GHz frequency band, and radiation efficiency corresponding to the radiation efficiency pits is lower.
In order to solve the problem that multiple frequency of the third frequency band is easy to fall on the first frequency band and/or the second frequency band, the embodiment of the application provides an antenna, wherein a first conductive element is arranged at a first position of an antenna radiator and/or a second conductive element is arranged at a second position of the antenna radiator; wherein the first position is opposite to the second position; the first conductive member and/or the second conductive member is configured to increase a capacitance of the antenna radiator between the first position and the second position.
The antenna radiator may be a loop radiator, the first and second positions may be disposed opposite each other at inner surfaces of the two opposite radiating arms, for example, the first and second positions may be located at inner surfaces of the first and second radiating arms, and the first and second positions may be opposite each other.
Fig. 7a is a schematic diagram of a position of a conductive member on an antenna radiator according to an embodiment of the present application, as shown in fig. 7a, in this embodiment, only a first conductive member 2011 may be disposed at a first position of the antenna radiator 201.
Fig. 7b is a schematic diagram of the position of another conductive element on the antenna radiator according to the embodiment of the present application, as shown in fig. 7b, in this embodiment, the second conductive element 2012 may be disposed only on the second position of the antenna radiator 201.
Fig. 7c is a schematic diagram of a position of another conductive member on an antenna radiator according to an embodiment of the present application, as shown in fig. 7c, in this embodiment, not only the first conductive member 2011 may be disposed at a first position of the antenna radiator 201, but also the second conductive member 2012 may be disposed at a second position of the antenna radiator 201.
In order to solve the problem that multiple frequency of the third frequency band is easy to fall in the first frequency band and/or the second frequency band, in another antenna provided in the embodiments of the present application, a specific capacitor may be disposed between the first position and the second position of the antenna radiator; wherein the first position is opposite to the second position; the specific capacitance is used to increase the capacitance value of the antenna radiator between the first and second positions.
Fig. 7d is a schematic diagram of a position of another conductive element on an antenna radiator according to an embodiment of the present application, as shown in fig. 7d, in this embodiment, not only the first conductive element 2011 may be disposed at a first position of the antenna radiator 201, but also a specific capacitor 2013 may be disposed between the first conductive element 2011 and a second position, so that the first conductive element 2011 and the specific capacitor 2013 can both increase the capacitance between the first position and the second position.
The present embodiment is not limited thereto, and in another embodiment, a specific capacitance 2013 may be provided between the first position and the second position. In yet another embodiment, a second conductive element 2012 may be disposed at a second location of the antenna radiator 201, with a particular capacitance 2013 disposed between the second conductive element 2012 and the first location. In yet another embodiment, a first conductive member 2011 may be disposed at a first location of the antenna radiator 201, a second conductive member 2012 may be disposed at a second location of the antenna radiator 201, and a specific capacitance 2013 may be disposed between the first conductive member 2011 and the second conductive member 2012.
The first conductive member 2011 and/or the second conductive member 2012 may be metal members or metal steps. Wherein the first location and the second location may be obtained by simulation. The first location and the second location may be obtained by a third frequency.
In some embodiments, the first location may be: in case the antenna radiator 201 operates in multiple frequency of the third frequency band, the electric field strength on the antenna radiator 201 is larger than the target position of at least two third positions of the specific strength. The first location may be a location of an inner surface of the antenna and the second location may be opposite the first location and also disposed at the inner surface of the antenna.
Further, in order to avoid the influence of the multiple frequency of the third frequency band on other working frequency bands, the target position may be: at least two third positions furthest from the fourth position and furthest from the fifth position; wherein the fourth position is: in the case where the antenna radiator 201 operates in the third frequency band, at least one position where the electric field intensity on the antenna radiator 201 is greater than the specific intensity; the fifth position is: in the case where the antenna radiator 201 operates in the second frequency band, at least one position where the electric field intensity on the antenna radiator 201 is greater than the specific intensity.
For further description of the first and second positions, please refer to the following description of the corresponding embodiment of fig. 9.
Fig. 8 is a schematic diagram of a radiation efficiency curve of another antenna according to the embodiment of the present application, as shown in fig. 8, a solid line indicates a radiation efficiency curve when a capacitance value between a first position and a second position is not increased, and in the curve, a radiation efficiency pit exists at a WIFI 5GHz band, so that the radiation efficiency of the WIFI 5GHz band is lower. The dotted line represents the radiation efficiency curve when improving the capacitance value between first position and the second position, in this curve, radiation efficiency pit is outside the WIFI 5GHz frequency channel for the radiation efficiency pit that the 7 frequency multiplication of n28 frequency channel arouses shifts out the WIFI 5G out of band, and the radiation efficiency in the WIFI 5GHz frequency channel is on a higher level, thereby the radiation efficiency of WIFI 5GHz frequency channel is higher.
In this embodiment of the present application, since at least one of the first conductive member 2011, the second conductive member 2012 and the specific capacitor 2013 is disposed, the capacitance between the first location and the second location can be increased, so that the radiation efficiency curve of the antenna can be changed, and the radiation efficiency of the antenna on other frequency bands is changed, so that the influence on the radiation efficiency of the antenna radiator 201 running on other frequency bands is avoided.
It should be noted that, in some embodiments, the embodiment in which at least one of the first conductive member 2011, the second conductive member 2012 and the specific capacitor 2013 is disposed may not have an attaching relationship with the embodiment corresponding to fig. 2, that is, the embodiment in which at least one of the first conductive member 2011, the second conductive member 2012 and the specific capacitor 2013 is disposed may be implemented separately, and/or the embodiment corresponding to fig. 2 may be implemented separately. In other embodiments, the embodiment in which at least one of the first conductive member 2011, the second conductive member 2012 and the specific capacitor 2013 is disposed may be implemented in accordance with the embodiment of fig. 2.
Under the condition that the n28 frequency band, the WIFI 2.4GHz frequency band and the WIFI 5GHz frequency band share the antenna radiator 201, since initial resonance of the n28 antenna is generally between 0.7GHz and 0.75GHz, 7 times of the initial resonance can occur in or near the WIFI 5G frequency band, and the radiation efficiency of the WIFI 5G is reduced. In the embodiment of the present application, by adopting a method of providing capacitive loading at the electric field strong point of the antenna radiator 201, the resonance point is shifted to a low frequency, so as to reduce the influence on the working frequency band. The electric field strength point may be the first position and/or the second position, and the capacitive loading method may be to increase the capacitance value of the first position and the second position by providing a conductive element at the first position and/or the second position, and/or by providing a capacitance between the first position and the second position.
It should be noted that the 7-frequency multiplication of n28 has a plurality of electric field intensity points on the antenna branch (i.e. the antenna radiator 201), so that the electric field intensity points of other working frequency bands such as n28, WIFI2.4G and the like need to be avoided as much as possible when the capacitive loading position is selected, and the influence on other frequency bands is reduced.
Fig. 9 is a schematic diagram of the positions of the electric field strong points and the electric field weak points of the antenna radiator in the embodiment of the present application, as shown in fig. 9, the position with a shadow is the position of the electric field strong points on the antenna radiator 201, the position without a shadow is the position of the electric field weak points on the antenna radiator 201, the 7-frequency multiplication of the n28 frequency band has four strong points and four weak points on the antenna radiator 201, the WIFI2.4GHz frequency band has two strong points and two weak points on the antenna radiator 201, and the n28 frequency band has one strong point and one weak point on the antenna radiator 201. The first electric field strong point on the 7-frequency left side of the n28 frequency band is farthest from the electric field strong point of the n28 frequency band and farthest from two electric field strong points of the WIFI2.4GHz frequency band, so that the influence on n28 and WIFI2.4G can be reduced to the greatest extent by adding a metal step to the first electric field strong point on the 7-frequency left side of the n28 frequency band to provide capacitive loading. In order not to affect the size of the antenna, an electric field strength point may be provided on the inner surface of the antenna.
The distance between the first electric field strong point of the frequency multiplication of n28 and the left side edge of the antenna radiator shown in fig. 9 is a specific distance, and in practical application, other points that are at a specific distance from the left side edge of the antenna radiator should also be the first electric field strong points, where the first electric field strong point in this embodiment of the present application can be understood as: any point on the antenna radiator and at a certain distance from the left edge of the antenna radiator.
Fig. 10 is a flowchart of an impedance matching method of an antenna according to an embodiment of the present application, as shown in fig. 10, where the method is applied to an impedance matching device of an antenna, and the method includes:
s1001, adjusting the capacitance value of a second capacitor and the inductance value of a second inductor in the LC parallel resonant circuit to enable the resonant frequency of the LC parallel resonant circuit to be smaller than the frequency of the first frequency band and larger than the frequency of the second frequency band; the antenna comprises an impedance matching circuit, wherein the impedance matching circuit comprises a first matching circuit and an LC parallel resonant circuit; the first frequency band is higher than the second frequency band.
The impedance matching device of the antenna may be a test device or an adjustment device. The circuit parameters of the components in the impedance matching circuit of the antenna can be debugged.
The frequencies less than the first frequency band may be frequencies less than a minimum value of the first frequency band and the frequencies greater than the second frequency band may be frequencies greater than a maximum value of the second frequency band.
S1003, adjusting the capacitance value of the second capacitor to enable the LC parallel resonant circuit to be matched with the first matching circuit, and further enabling the impedance of the impedance matching circuit to be matched with the first impedance, wherein the first impedance is the impedance of an antenna radiator in the antenna working in a first frequency band.
Adjusting the capacitance value of the second capacitance may be increasing the capacitance value of the second capacitance or decreasing the capacitance value of the second capacitance.
S1005, adjusting the inductance value of the second inductor to enable the LC parallel resonant circuit to be matched with the first matching circuit, and further enabling the impedance of the impedance matching circuit to be matched with the second impedance, wherein the second impedance is the impedance of the antenna radiator working in the second frequency band.
The embodiment of the present application does not limit the execution sequence between S1003 and S1005, and S1003 and S1005 may be executed simultaneously or sequentially.
Adjusting the inductance value of the second inductor may be increasing the inductance value of the second inductor or decreasing the inductance value of the second inductor.
In the embodiment of the application, the resonant frequency of the LC parallel resonant circuit is adjusted to be smaller than the frequency of the first frequency band and larger than the frequency of the second frequency band, so that the LC parallel resonant circuit is capacitive and sensitive to the change of capacitance under the condition that the antenna works in the first frequency band, the impedance of the impedance matching circuit is matched with the impedance of the antenna radiator working in the first frequency band by adjusting the capacitance value of the LC parallel resonant circuit, and the LC parallel resonant circuit is inductive and sensitive to the change of inductance under the condition that the antenna works in the second frequency band, and therefore the impedance of the impedance matching circuit is matched with the impedance of the antenna radiator working in the second frequency band by adjusting the inductance value of the LC parallel resonant circuit.
Based on the embodiment corresponding to fig. 10, the embodiment of the present application may further provide an impedance matching method of an antenna, where compared with the embodiment corresponding to fig. 10, the method is different in that: after adjusting the capacitance value of the second capacitor and the inductance value of the second inductor, the method further comprises the steps of:
under the condition that the antenna radiator works in a first frequency band and a second frequency band, fourth impedance and fifth impedance between a receiving and transmitting signal end of the antenna radiator and one end of the impedance matching circuit, which is used for connecting an antenna feeder line, are respectively obtained; determining that the difference between the fourth impedance and the specific impedance is greater than the first value and/or that the difference between the fifth impedance and the specific impedance is greater than the second value; and adjusting circuit parameters of the first matching circuit to enable the LC parallel resonant circuit and the first matching circuit to be matched with each other, so that the difference value between the fourth impedance and the specific impedance is smaller than or equal to a first value, and the difference value between the fifth impedance and the specific impedance is smaller than or equal to a second value.
In the embodiment of the application, the difference between the impedance and the impedance may be at least one of a real part difference, an imaginary part difference, a combination of the real part difference and the imaginary part difference, and a mode value difference.
The adjusting of the circuit parameter in the first matching circuit may be adjusting a resistance value of a resistor and/or an inductance value of an inductor and/or a capacitance value of a capacitor in the first matching circuit.
In the embodiment of the application, when the impedance of the impedance matching circuit cannot be matched with the first impedance and/or the second impedance by adjusting the LC parallel resonant circuit, the impedance of the impedance matching circuit is matched with the first impedance and/or the second impedance by adjusting the circuit parameters of the first matching circuit.
In some embodiments, the impedance matching method of the antenna may further include: adjusting circuit parameters of a second matching circuit in the impedance matching circuit to enable the impedance of the impedance matching circuit to be matched with the third impedance; the third impedance is the impedance of the antenna radiator working in a third frequency band; wherein the center frequency of the second frequency band is higher than the center frequency of the third frequency band.
Fig. 11 is a flowchart of another impedance matching method of an antenna according to an embodiment of the present application, as shown in fig. 11, where the method is applied to an impedance matching device of an antenna, and the method may include:
s1101, obtaining at least two third positions of the antenna radiator, wherein the electric field intensity of the third positions is larger than the specific intensity under the condition that the antenna radiator works in the multiple frequency of the third frequency band.
S1103, determining a target position from the at least two third positions.
S1105, determining a first position and a second position set relatively based on the target position.
S1107, arranging a first conductive piece at the first position and/or arranging a second conductive piece at the second position, or arranging a specific capacitor between the first position and the second position so as to increase the capacitance value of the antenna radiator between the first position and the second position.
In some embodiments, the steps of S1101 to S1107 may be independent of the steps of S1001 to S1005, i.e., S1101 to S1107 may be implemented separately and the steps of S1001 to S1005 may be implemented separately. In other embodiments, the steps of S1101 to S1107 may depend on the steps of S1001 to S1005, for example, the steps of S1101 to S1107 may be performed before or after the steps of S1001 to S1005.
In some embodiments, determining the target location from at least two third locations may include: acquiring a fourth position where the electric field intensity on the antenna radiator is greater than the specific intensity under the condition that the antenna radiator works in the third frequency band; acquiring a fifth position where the electric field intensity on the antenna radiator is greater than the specific intensity under the condition that the antenna radiator works in the second frequency band; and determining the position with the longest distance from the fourth position and the longest distance from the fifth position in the at least two third positions as the target position.
In the embodiment of the present application, the third position, the fourth position, or the fifth position may be: in the antenna radiator, a position separated from a certain end point of the antenna radiator by a certain length.
The embodiment of the application can also provide a terminal, which comprises the antenna in any embodiment.
The terminal may include a middle frame, and the antenna radiator may be a part of the middle frame to implement a signal transceiving function. The other end of the antenna feeder line in the embodiment of the application can be connected to one end of a transceiver, the other end of the transceiver can be connected to one end of a radio frequency chip, and the other end of the radio frequency chip can be connected to a processor of a terminal.
The terminal may be any device with an antenna, for example, a terminal in an embodiment of the present application may include: a mobile station, remote terminal device, mobile device, user Equipment (UE), wireless communication device, user agent, or User Equipment. The terminal device may be a server, a mobile phone, a tablet computer, a notebook computer, a palm computer, a personal digital assistant, a portable media player, a smart speaker, a navigation device, a display device, a wearable device such as a smart bracelet, a Virtual Reality (VR) device, an augmented Reality (Augmented Reality, AR) device, a pedometer, a digital TV, a desktop computer, a base station, or the like.
It should be appreciated that reference throughout this specification to "some embodiments" or "an embodiment" or "embodiments of the present application" or "the foregoing embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in some embodiments" or "in an embodiment" or "embodiments of the present application" or "the foregoing embodiments" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application. The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
Without being specifically described, the impedance matching device of the antenna performs any step in the embodiments of the present application, and may be a processor or an executing device of the impedance matching device of the antenna performs the step. The embodiments of the present application do not limit the order in which the following steps are performed by the impedance matching device of the antenna unless specifically stated. In addition, the manner in which the data is processed in different embodiments may be the same method or different methods. It should be further noted that any step in the embodiments of the present application may be performed by the impedance matching device of the antenna independently, that is, when the impedance matching device of the antenna performs any step in the embodiments described above, the performance of the other steps may not be relied upon.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In several embodiments provided herein, it should be understood that the disclosed antennas and methods may be implemented in other ways. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, device or apparatus, whether electrical, mechanical or otherwise.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units; can be located in one place or distributed to a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The methods disclosed in the several method embodiments provided in the present application may be arbitrarily combined without collision to obtain a new method embodiment.
The features disclosed in the several product embodiments provided in the present application may be combined arbitrarily without conflict to obtain new product embodiments.
The features disclosed in the several method or apparatus embodiments provided in the present application may be arbitrarily combined without conflict to obtain new method embodiments or apparatus embodiments.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read Only Memory (ROM), a magnetic disk or an optical disk, or the like, which can store program codes.
Alternatively, the integrated units described above may be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributing to the related art, and the computer software product may be stored in a storage medium, and include several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a removable storage device, a ROM, a magnetic disk, or an optical disk.
The drawings in the embodiments of the present application are only for illustrating schematic positions of respective devices on the impedance matching apparatus of the antenna, and do not represent actual positions in the impedance matching apparatus of the antenna, the actual positions of the respective devices or the respective areas may be changed or shifted accordingly according to actual situations (for example, structures of the impedance matching apparatus of the antenna), and proportions of different portions in the impedance matching apparatus of the antenna in the drawings do not represent actual proportions.
The foregoing is merely an embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (15)

1. An antenna, comprising: an antenna radiator, an antenna feeder, and an impedance matching circuit connected between the antenna radiator and the antenna feeder;
the antenna radiator is used for receiving or transmitting signals of a first frequency band, signals of a second frequency band and/or signals of a third frequency band, and the center frequency of the first frequency band is higher than the center frequency of the second frequency band; the center frequency of the second frequency band is higher than the center frequency of the third frequency band;
The antenna radiator comprises a conductive piece and/or a specific capacitor, and the conductive piece and/or the specific capacitor is arranged at a position corresponding to an electric field strong point on the antenna radiator when the antenna radiator works at multiple frequency of the third frequency band;
the impedance matching circuit comprises a first matching circuit and an LC parallel resonant circuit, wherein the first matching circuit is connected with the LC parallel resonant circuit in series, and the resonant frequency of the LC parallel resonant circuit is smaller than the center frequency of the first frequency band and larger than the center frequency of the second frequency band;
the first matching circuit is matched with the LC parallel resonant circuit and is used for matching the impedance of the impedance matching circuit with the first impedance and/or the second impedance; the first impedance is the impedance of the antenna radiator working in the first frequency band, and the second impedance is the impedance of the antenna radiator working in the second frequency band.
2. The antenna of claim 1, wherein the impedance matching circuit further comprises: the LC parallel resonant circuit, the first matching circuit and the second matching circuit are sequentially connected in series in any order;
The length of the antenna radiator is larger than or equal to one quarter of the wavelength corresponding to the center frequency of the third frequency band;
the second matching circuit is used for matching the impedance of the impedance matching circuit with a third impedance; the third impedance is an impedance of the antenna radiator operating in the third frequency band.
3. The antenna of claim 2, wherein the second matching circuit comprises: a first capacitor and a first inductor;
one end of the first capacitor is connected with the LC parallel resonant circuit, the other end of the first capacitor is connected with the antenna feeder line, or the other end of the first capacitor is connected with the antenna feeder line through the first matching circuit;
one end of the first inductor is connected with the LC parallel resonant circuit, and the other end of the first inductor is grounded.
4. The antenna of claim 2 or 3, wherein the first frequency band is a WIFI 5GHz frequency band, the second frequency band is a WIFI 2.4GHz frequency band, and the third frequency band is a GPS L5 frequency band or an n28 frequency band.
5. An antenna according to any one of claims 1 to 3, wherein the first matching circuit comprises one of: l-shaped matching circuit, T-shaped matching circuit and pi-shaped matching circuit.
6. The antenna according to claim 1, wherein the conductive element comprises a first conductive element and/or a second conductive element, and the location corresponding to the electric field strength point comprises a first location and/or a second location; the first conductive piece is arranged at the first position of the antenna radiator and/or the second conductive piece is arranged at the second position of the antenna radiator;
wherein the first position is opposite the second position; the first conductive member and/or the second conductive member is configured to increase a capacitance value of the antenna radiator between the first position and the second position.
7. The antenna according to claim 1, wherein the location corresponding to the electric field strength point comprises a first location and/or a second location; a specific capacitor is arranged between the first position and the second position of the antenna radiator;
wherein the first position is opposite the second position; the specific capacitance is used to increase a capacitance value of the antenna radiator between the first location and the second location.
8. The antenna of claim 6 or 7, wherein the first location is: under the condition that the antenna radiator works for multiple frequency of a third frequency band, the electric field intensity on the antenna radiator is larger than the target position in at least two third positions with specific intensity;
The length of the antenna radiator is greater than or equal to one quarter of the wavelength corresponding to the center frequency of the third frequency band.
9. The antenna of claim 8, wherein the target location is: a position farthest from the fourth position and farthest from the fifth position among the at least two third positions;
wherein the fourth location is: under the condition that the antenna radiator works in the third frequency band, the electric field intensity on the antenna radiator is larger than at least one position of the specific intensity;
the fifth position is: and under the condition that the antenna radiator works in the second frequency band, the electric field intensity on the antenna radiator is larger than at least one position of the specific intensity.
10. An impedance matching method for an antenna, comprising:
the capacitance value of a second capacitor and the inductance value of a second inductor in the LC parallel resonance circuit are regulated, so that the resonance frequency of the LC parallel resonance circuit is smaller than the frequency of the first frequency band and larger than the frequency of the second frequency band; wherein the antenna comprises an impedance matching circuit comprising a first matching circuit and the LC parallel resonant circuit; the first frequency band is higher than the second frequency band;
The capacitance value of the second capacitor is adjusted, so that the LC parallel resonant circuit is matched with the first matching circuit, and the impedance of the impedance matching circuit is matched with first impedance, wherein the first impedance is the impedance of an antenna radiator in the antenna under the first frequency band;
adjusting the inductance value of the second inductor to enable the LC parallel resonant circuit to be matched with the first matching circuit, so that the impedance of the impedance matching circuit is matched with second impedance, and the second impedance is the impedance of the antenna radiator working in the second frequency band;
acquiring the electric field intensity on the antenna radiator under the condition that the antenna radiator works at multiple frequency of a third frequency band; the center frequency of the second frequency band is higher than the center frequency of the third frequency band;
and arranging a conductive piece and/or a specific capacitor at a position corresponding to the electric field intensity on the antenna radiator.
11. The method according to claim 10, wherein the method further comprises:
under the condition that the antenna radiator works in the first frequency band and the second frequency band, fourth impedance and fifth impedance between a receiving and transmitting signal end of the antenna radiator and one end of the impedance matching circuit, which is used for connecting an antenna feeder line, are respectively obtained;
Determining that a difference between the fourth impedance and a particular impedance is greater than a first value and/or that a difference between the fifth impedance and the particular impedance is greater than a second value;
and adjusting circuit parameters of the first matching circuit to enable the LC parallel resonant circuit and the first matching circuit to be matched with each other, so that the difference value between the fourth impedance and the specific impedance is smaller than or equal to the first value, and the difference value between the fifth impedance and the specific impedance is smaller than or equal to the second value.
12. The method according to claim 10, wherein the method further comprises:
adjusting circuit parameters of a second matching circuit in the impedance matching circuit to enable the impedance of the impedance matching circuit to be matched with a third impedance; the third impedance is the impedance of the antenna radiator working in the third frequency band; wherein the center frequency of the second frequency band is higher than the center frequency of the third frequency band.
13. The method according to any one of claims 10 to 12, further comprising:
acquiring at least two third positions on the antenna radiator, wherein the electric field strength of the third positions is larger than the specific strength;
Determining a target location from the at least two third locations;
determining a first position and a second position oppositely arranged on the antenna radiator based on the target position;
and the first conductive piece is arranged at the first position and/or the second conductive piece is arranged at the second position, or a specific capacitor is arranged between the first position and the second position, so that the capacitance value of the antenna radiator between the first position and the second position is increased.
14. The method of claim 13, wherein the determining a target location from the at least two third locations comprises:
acquiring a fourth position where the electric field intensity on the antenna radiator is larger than the specific intensity under the condition that the antenna radiator works in the third frequency band;
acquiring a fifth position of the antenna radiator, wherein the electric field intensity of the fifth position is larger than the specific intensity under the condition that the antenna radiator works in the second frequency band;
and determining the position with the longest distance from the fourth position and the longest distance from the fifth position in the at least two third positions as the target position.
15. A terminal, comprising:
The antenna of any one of claims 1 to 9.
CN202011148347.2A 2020-10-23 2020-10-23 Antenna, impedance matching method thereof and terminal Active CN112397902B (en)

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