CN109546310A - A kind of antenna structure and communication terminal - Google Patents
A kind of antenna structure and communication terminal Download PDFInfo
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- CN109546310A CN109546310A CN201811519720.3A CN201811519720A CN109546310A CN 109546310 A CN109546310 A CN 109546310A CN 201811519720 A CN201811519720 A CN 201811519720A CN 109546310 A CN109546310 A CN 109546310A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
-
- 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
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- 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
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
-
- 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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Aerials (AREA)
Abstract
本发明提供一种天线结构及通信终端，该天线结构包括：天线辐射体、第一阻抗匹配电路、第二阻抗匹配电路和信号源；天线辐射体的第一端接地，天线辐射体上设置有馈电点；第一阻抗匹配电路包括第一电感和第一电容，其中，第一电感的第一端与馈电点连接，第一电感的第二端与第一电容的第一端连接，第一电容的第二端与信号源的第一端连接；第二阻抗匹配电路的第一端与第一电感的第二端连接，第二阻抗匹配电路的第二端接地；信号源的第二端接地；天线辐射体的长度与第一频段的1/4波长的差值的绝对值小于第一特定值。这样，由于存在第一阻抗匹配电路和第二阻抗匹配电路，可以减小天线的电压驻波比和降低匹配电路的热损耗，提升天线的性能。
The invention provides an antenna structure and a communication terminal. The antenna structure includes: an antenna radiator, a first impedance matching circuit, a second impedance matching circuit and a signal source; the first end of the antenna radiator is grounded, and the antenna radiator is provided with a a feeding point; the first impedance matching circuit includes a first inductor and a first capacitor, wherein the first end of the first inductor is connected to the feeding point, the second end of the first inductor is connected to the first end of the first capacitor, The second end of the first capacitor is connected to the first end of the signal source; the first end of the second impedance matching circuit is connected to the second end of the first inductor, and the second end of the second impedance matching circuit is grounded; The two ends are grounded; the absolute value of the difference between the length of the antenna radiator and the 1/4 wavelength of the first frequency band is smaller than the first specific value. In this way, due to the existence of the first impedance matching circuit and the second impedance matching circuit, the voltage standing wave ratio of the antenna can be reduced, the heat loss of the matching circuit can be reduced, and the performance of the antenna can be improved.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of antenna structures and communication terminal.
Background technique
With the rapid development of terminal technology, communication terminal has become essential a kind of tool in people's life,
And the various aspects for user's life are brought great convenience.Common metal center or all-metal electricity in daily life
The communication terminal of pond lid shape is generally provided with antenna, and antenna can work in multiple frequency ranges, such as can be 1.55
It works in the band limits of~1.62GHz and 2.4~2.5GHz.
But in the prior art, the voltage standing wave ratio of antenna is bigger, causes the performance of antenna poor.
Summary of the invention
The embodiment of the present invention provides a kind of antenna structure and communication terminal, the performance to solve the problems, such as antenna are poor.
In order to solve the above-mentioned technical problem, the present invention is implemented as follows:
In a first aspect, the embodiment of the invention provides a kind of antenna structures, comprising: antenna radiator, the first impedance matching
Circuit, the second impedance matching circuit and signal source；
The first end of the antenna radiator is grounded, and is provided with feeding point on the antenna radiator, the feeding point with
The distance between described first end is greater than 0；
First impedance matching circuit includes the first inductance and first capacitor, wherein the first end of first inductance
It is connect with the feeding point, the second end of first inductance is connect with the first end of the first capacitor, the first capacitor
Second end connect with the first end of the signal source；
The first end of second impedance matching circuit is connect with the second end of first inductance, second impedance
Second end ground connection with circuit；
The second end of the signal source is grounded；
The absolute value of the difference of 1/4 wavelength of the length of the antenna radiator and the first frequency range is less than the first particular value.
Second aspect, the embodiment of the present invention also provide a kind of communication terminal, including above-mentioned antenna structure.
A kind of antenna structure of the embodiment of the present invention, comprising: antenna radiator, the first impedance matching circuit, the second impedance
Match circuit and signal source；The first end of the antenna radiator is grounded, and is provided with feeding point on the antenna radiator, described
The distance between feeding point and the first end are greater than 0；First impedance matching circuit includes the first inductance and first capacitor,
Wherein, the first end of first inductance is connect with the feeding point, the second end and the first capacitor of first inductance
First end connection, the second end of the first capacitor connect with the first end of the signal source；The second impedance matching electricity
The first end on road is connect with the second end of first inductance, the second end ground connection of second impedance matching circuit；The letter
The second end ground connection in number source；The absolute value of the difference of 1/4 wavelength of the length of the antenna radiator and the first frequency range is less than the
One particular value.In this way, due to there are the first impedance matching circuit and the second impedance matching circuit, the voltage that can reduce antenna is stayed
Bobbi and the thermal losses for reducing match circuit, promote the performance of antenna, and can satisfy the resonance frequency of the second resonance mode with
The ratio of the resonance frequency of first resonance mode is less than 2.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is one of the structural schematic diagram of antenna structure provided in an embodiment of the present invention；
Fig. 2 is the second structural representation of antenna structure provided in an embodiment of the present invention；
Fig. 3 is Antenna Impedance Matching schematic diagram provided in an embodiment of the present invention；
Fig. 4 is the voltage standing wave ratio contrast schematic diagram of antenna structure provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It is the structural schematic diagram of antenna structure provided in an embodiment of the present invention referring to Fig. 1, Fig. 1, as shown in Figure 1, day knot
Structure includes antenna radiator 1, the first impedance matching circuit, the second impedance matching circuit 2 and signal source 3；The antenna radiator 1
First end 11 be grounded, feeding point 12 is provided on the antenna radiator 1, between the feeding point 12 and the first end 11
Distance be greater than 0；First impedance matching circuit includes the first inductance L1 and first capacitor C1, wherein first inductance
The first end of L1 is connect with the feeding point 12, and the second end of the first inductance L1 and the first end of the first capacitor C1 connect
It connects, the second end of the first capacitor C1 is connect with the first end of the signal source 3；The of second impedance matching circuit 2
One end is connect with the second end of the first inductance L1, the second end ground connection of second impedance matching circuit 2；The signal source
3 second end ground connection；The absolute value of the difference of 1/4 wavelength of the length and the first frequency range of the antenna radiator 1 is less than first
Particular value.
In the present embodiment, above-mentioned ground connection can by mainboard, the modes such as metal shell or metal floor be grounded, to this
The present embodiment does not limit.Antenna radiator 1 may include second end 13, and the second of feeding point 12 and antenna radiator 1
Length between end 13 can be greater than the length between feeding point 12 and the first end 11 of antenna radiator 1.Above-mentioned first is specific
Value can be a suitable numerical value, and specific numerical value can be selected according to the precision of actual requirement, not to this present embodiment
It limits.The absolute value of the difference of 1/4 wavelength of the length of antenna radiator 1 and the first frequency range, can be with less than the first particular value
The length for being interpreted as antenna radiator 1 approaches and it is in 1/4 wavelength for positioning frequency range (1.55~1.62GHz, i.e. the first frequency range)
It generally can be that (size is applied in communication terminal by 16~28mm or so and greater than 3/16 wavelength and less than 3/8 wavelength
Size, the physical length of 1/4 wavelength is different in different media), preferred value can be 20mm.Feeding point 12 and antenna radiator 1
Second end 13 between length can be less than 3/8 wavelength of WIFI2.4G frequency range (2.4~2.5GHz), generally can for 0~
18mm, preferred value can be 15mm.
It should be noted that demand of the above specific size just for positioning frequency range and WIFI2.4G frequency range.Operation frequency
Then specific size needs adjust accordingly Duan Butong, and to this, the present embodiment does not limit, but still falls within the protection model of this programme
It encloses.
In the present embodiment, the distance between the feeding point 12 and the first end 11 are greater than 0, i.e. feeding point 12 cannot connect
The first end 11 of antenna radiator 1.Because first end 11 is the ground terminal of antenna radiator 1, feeding point 12 and the ground terminal connect
It connects and will lead to antenna failure.To which the distance between the feeding point 12 and described first end 11 are greater than 0, can be lost to avoid antenna
Effect.
In the present embodiment, above-mentioned second impedance matching circuit 2 can be made of an inductance and a capacitor in parallel；Or
Person, the second impedance matching circuit 2 can also be made of two sub- circuit in parallel, and one of sub-circuit is multiple concatenated inductance
It forms, another sub-circuit is composed in parallel by multiple capacitors etc..
In this way, due to the presence of the first impedance matching circuit and the second impedance matching circuit 2, so as to so that signal source 3
The impedance at place, which reaches, to be needed near matched impedance.For example, can by the first impedance matching circuit and the second impedance matching circuit 2
Drawing the impedance at signal source 3 near 50 Europe, so as to preferably be carried out with 50 Europe port Impedances of signal source 3
Match, makes the voltage standing wave ratio for reducing antenna, to promote the performance of antenna.Also, the thermal losses of match circuit can also be reduced,
And it can satisfy the ratio of the resonance frequency of the second resonance mode and the resonance frequency of first resonance mode less than 2.Wherein,
The resonance frequency of first resonance mode refers to frequency corresponding to the smallest point of aerial voltage standing-wave ratio in the first resonance mode,
The resonance frequency of second resonance mode refers to frequency corresponding to the smallest point of aerial voltage standing-wave ratio in the second resonance mode.
Optionally, second impedance matching circuit 2 includes the second inductance L2 and the second capacitor C2；
The first end of the second inductance L2 is connect with the second end of the first inductance L1, and the of the second inductance L2
Two ends ground connection；
The first end of the second capacitor C2 is connect with the second end of the first inductance L1, and the of the second capacitor C2
Two ends ground connection.
In order to better understand above-mentioned set-up mode, referring to Fig. 2, Fig. 2 is antenna structure provided in an embodiment of the present invention
Structural schematic diagram.As shown in Fig. 2, the second impedance matching circuit 2 is made of the second inductance L2 and the second capacitor C2 parallel connection, and
The first end of the second inductance L2 is connect with the second end of the first inductance L1, the second termination of the second inductance L2
Ground；The first end of the second capacitor C2 is connect with the second end of the first inductance L1, the second end of the second capacitor C2
Ground connection.
In the embodiment, moved with feeding point 12 toward the direction of the second end 13 far from antenna radiator 1, then signal
WIFI2.4G frequency range (2.4~2.5GHz) impedance at source 3 will be rotated clockwise from third quadrant toward the second quadrant.Referring again to
Fig. 3, Fig. 3 are Antenna Impedance Matching schematic diagram provided in an embodiment of the present invention.
As shown in figure 3, the Smith chart expression on the left side is not added with the first inductance L1, first capacitor C1, the second inductance L2
Original impedance when with the second capacitor C2, at signal source 3.In the antenna structure be added addition the first inductance L1, first capacitor C1,
After second inductance L2 and the second capacitor C2, can refering to the Smith chart on the right, two frequency ranges (1.55~1.62GHz and
2.4~2.5GHz) under impedance at signal source 3 be matched near 50 Europe.
Also, it further can be refering to the Smith chart on the right in Fig. 3.In addition the first inductance L1, the second capacitor
When C2 and the second inductance L2, the impedance under 1.55~1.62GHz at signal source 3 is located at position A, signal source 3 under 2.4~2.5GHz
The impedance at place is located at position B.When adding the first inductance L1, first capacitor C1, the second inductance L2 and the second capacitor C2,1.55~
Impedance under 1.62GHz at signal source 3 is located at position C, and the impedance under 2.4~2.5GHz at signal source 3 is located at position D.
Second capacitor C2 and the second inductance L2 has very big shadow to the resonance frequency (1.55~1.62GHz) of the first resonance mode
It rings, and the first inductance L1 and the second capacitor C2 has a significant impact to the resonance frequency (2.4~2.5GHz) of the second resonance mode.One
As for, the size of the first inductance L1 can be 0~6nH, and preferred value can be 3nH.The size of second capacitor C2 can be
0.3pf~1pf, preferred value can be 0.5pf.The size of second inductance L2 can be 10nH~68nH, and preferred value can be
16nH.The size of first capacitor C1 can be 0.4p~1.2pf, and preferred value can be 0.5pf.
It should be noted that the occurrence of above-mentioned first capacitor C1, the second capacitor C2, the first inductance L1 and the second inductance L2
Just for the demand of positioning frequency range and WIFI2.4G frequency range.Then specific size needs adjust accordingly operation frequency range difference,
Without limitation to this present embodiment.But still fall within the protection scope of this programme.
It is the voltage standing wave ratio contrast schematic diagram of antenna structure referring again to Fig. 4, Fig. 4.In Fig. 4, dotted line E and dotted line F table
Show the voltage standing wave ratio of antenna in the prior art, solid line G and solid line H indicate addition the first inductance L1, first capacitor C1, second
The voltage standing wave ratio of the aft antenna of inductance L2 and the second capacitor C2.As it can be seen that antenna mismatch loss is significantly improved.Meanwhile
Due to increasing the second capacitor C2, series inductance i.e. the first inductance L1 is obviously reduced, therefore the heat of the first inductance L1
Loss is obviously reduced, and the loss of first capacitor C1 and the second capacitor C2 are very littles, so the heat waste of this impedance matching circuit
Consumption can be substantially reduced.
Under identical day space of lines, for example, comprehensively screen communication terminal, at this time antenna distance about 1.2mm (be commonly called as antenna
Clearance).1 total length 20mm of antenna radiator.Compare the actual measurement antenna efficiency under the prior art and present embodiment.Positioning
The antenna efficiency of frequency range (1.55~1.62GHz) averagely improves 1.2dB, the antenna of WIFI2.4G frequency range (2.4~2.5GHz)
Efficiency averagely improves 0.7dB, and can satisfy the resonance frequency of the second resonance mode and the resonance frequency of the first resonance mode
Ratio less than 2, specific value please refers to following table:
Above-mentioned impedance matching circuit can also be applied to primary antenna (0.7~0.96GHz, 1.71~2.69GHz), such as be used for
Generate low-frequency range (0.7~0.96GHz) and Mid Frequency (1.71~2.17GHz) two resonance modes or low-frequency range (0.7~
0.96GHz) and two resonance modes of high band (2.3~2.69GHz)；Can be used for generate Mid Frequency (1.71~
2.17GHz) and two resonance modes of high band (2.3~2.69GHz).Only need appropriate adjustment antenna radiator 1 and feed
Length between point 12 and the second end 13 of antenna radiator 1, while cooperating above-mentioned impedance matching circuit (the first impedance of adjustment
With circuit or the second impedance matching circuit) value.For example generate low-frequency range (0.7~0.96GHz) and high band (2.3
~2.69GHz) two resonance modes, then near 1/4 wavelength of the extended length tremendously low frequency section of antenna radiator 1, such as 40mm,
And the length between feeding point 12 and the second end 13 of antenna radiator 1 is less than 3/8 wavelength of high band (2.3~2.69GHz),
It generally can be 0~18mm, preferred value can be 15mm, while appropriate adjustment the second inductance L2 is 33nH, and the second capacitor C2 is
0.8pf.
Above-mentioned impedance matching circuit can also be applied to following situation, the first frequency range and the second frequency range can for 2.4~
It is any in the frequency bands such as 2.5GHz, 2.5~2.69GHz, 3.3~3.8GHz, 4.4~4.9GHz and 5.1~5.85GHz to meet the
Combination of two of the resonance frequency of two resonance modes divided by the resonance frequency of the first resonance mode less than 2.
Optionally, the ratio of the first length and the second length is greater than 1/20, wherein first length is the feeding point
Length between 12 and the first end 11 of the antenna radiator 1, second length are the length of the antenna radiator 1.
In the embodiment, the ratio of the first length and the second length is greater than 1/20, can better meet antenna impedance
Matched demand promotes the performance of antenna.
Optionally, the length between the feeding point 12 and the first end 11 of the antenna radiator is less than the feed
Length between point 12 and the second end 13 of the antenna radiator.
In the embodiment, length between the feeding point 12 and the first end 11 of the antenna radiator is less than institute
The length stated between feeding point 12 and the second end 13 of the antenna radiator mentions so as to preferably carry out impedance matching
It dies the performance of line.Feeding point 12 far from antenna radiator second end 13 when, can reduce feed structure to aerial radiation
It influences, promotes antenna radiation capability, further promote antenna performance.
Optionally, the length between the feeding point 12 and the second end 13 of the antenna radiator 1 is less than the second frequency range
3/8 wavelength.
In the embodiment, the length between the feeding point 12 and the second end 13 of the antenna radiator 1 is less than
3/8 wavelength of two frequency ranges can be generally 0~18mm, and preferred value can be 15mm.Due to the feeding point 12 and the antenna
Less than 3/8 wavelength of the second frequency range, the demand that can satisfy Antenna Impedance Matching mentioned for length between the second end 13 of radiator 1
It dies the performance of line.
Optionally, the antenna structure is for generating the first resonance mode and the second resonance mode, and first resonance
The resonance frequency of mode is lower than the resonance frequency of second resonance mode.
In the embodiment, above-mentioned antenna structure is for generating the first resonance mode and the second resonance mode, and described the
The resonance frequency of one resonance mode is lower than the resonance frequency of second resonance mode.So as to cooperate impedance matching circuit to drop
The voltage standing wave ratio of low first resonance mode and the second resonance mode, to promote the performance of antenna.It should be noted that second
The ratio of the resonance frequency of resonance mode and the resonance frequency of the first resonance mode can be less than 2.
Optionally, the resonance frequency of second resonance mode and the ratio of the resonance frequency of first resonance mode are small
In 2.
In the embodiment, the resonance frequency of the resonance frequency of second resonance mode and first resonance mode
Ratio can cooperate impedance matching circuit to reduce the voltage standing wave ratio of the first resonance mode and the second resonance mode less than 2, thus
Promote the performance of antenna.
Optionally, the resonance band of first resonance mode be first frequency range, second resonance mode it is humorous
Vibration frequency range is second frequency range, and first frequency range and second frequency range are 2.4~2.5GHz, 2.5~2.69GHz, 3.3
Different frequency range in~3.8GHz, 4.4~4.9GHz and 5.1~5.85GHz.
It is small in the ratio of the resonance frequency and the resonance frequency of the first resonance mode of the second resonance mode in the embodiment
Under conditions of 2, first frequency range and second frequency range be 2.4~2.5GHz, 2.5~2.69GHz, 3.3~3.8GHz,
Different frequency range in 4.4~4.9GHz and 5.1~5.85GHz, so as to select suitable frequency range according to the actual situation, thus
Make antenna that there can be preferable performance under different scenes.
Optionally, the resonance band of first resonance mode be first frequency range, second resonance mode it is humorous
Vibration frequency range is second frequency range, and first frequency range is 1.71~2.17GHz, and second frequency range is 2.3~2.69GHz.
In the embodiment, 1.71~2.17GHz is Mid Frequency, and 2.3~2.69GHz is high band, so that antenna can be with
Mid Frequency and high band are covered, the adaptability of antenna is promoted.
Optionally, the resonance band of first resonance mode be first frequency range, second resonance mode it is humorous
Vibration frequency range be second frequency range, first frequency range be 0.7~0.96GHz, second frequency range be 1.71~2.17GHz or
2.3~2.69GHz of person.
In the embodiment, 0.7~0.96GHz is low-frequency range, and 1.71~2.17GHz is Mid Frequency, 2.3~2.69GHz
For high band.In this way, antenna can cover low-frequency range and Mid Frequency, or covering low-frequency range and high band, so as to basis
It is actual to need to select suitable frequency range, to make antenna that can have preferable performance under different scenes.
Optionally, the resonance band of first resonance mode be first frequency range, first frequency range be 1.55~
1.62GHz；The resonance band of second resonance mode be second frequency range, second frequency range be 2.4~2.5GHz or
2.5~2.69GHz of person.
In the embodiment, above-mentioned first frequency range can also be known as positioning frequency range, such as be used for GPS, Beidou positioning service.
Optionally, the size of the first inductance L1 is 0~6nH.
In the embodiment, the size of the first inductance L1 is 0~6nH, and preferred value can be 3nH.First inductance L1
Size can according to first frequency range determine.
Optionally, the size of the second capacitor C2 is 0.3pf~1pf.
In the embodiment, the size of the second capacitor C2 is 0.3pf~1pf, and preferred value can be 0.5pf.Second
The size of capacitor C2 can be determined according to first frequency range and second frequency range.
Optionally, the size of the second inductance L2 is 10nH~68nH, the size of the first capacitor C1 be 0.4p~
1.2pf。
In the embodiment, the size of the second inductance L2 is 10nH~68nH, and preferred value can be 16nH, the second electricity
The size for feeling L2 can be determined according to second frequency range.The size of the first capacitor C1 is 0.4pf~1.2pf, preferred value
It can be 0.5pf, the size of first capacitor C1 can be determined according to first frequency range and second frequency range.
Optionally, the antenna structure be communication terminal metal edge frame perhaps a part of metal-back or be setting
In the intracorporal metallic object of the shell of communication terminal.
In the embodiment, the antenna structure be communication terminal metal edge frame perhaps a part of metal-back or
The intracorporal metallic object of shell to be set to communication terminal, can be selected according to the actual situation, to meet suitable setting
Mode.Also, the material of the metallic object can be FPC, LDS, magnesium alloy or stainless steel etc..
The antenna structure of the embodiment of the present invention, including antenna radiator 1, the first impedance matching circuit, the second impedance matching
Circuit 2 and signal source 3；The first end 11 of the antenna radiator 1 is grounded, and is provided with feeding point 12 on the antenna radiator 1,
The distance between the feeding point 12 and the first end 11 are greater than 0；First impedance matching circuit includes the first inductance L1
With first capacitor C1, wherein the first end of the first inductance L1 is connect with the feeding point 12, and the of the first inductance L1
Two ends are connect with the first end of the first capacitor C1, the first end of the second end of the first capacitor C1 and the signal source 3
Connection；The first end of second impedance matching circuit 2 is connect with the second end of the first inductance L1, second impedance
Second end ground connection with circuit 2；The second end of the signal source 3 is grounded；The length of the antenna radiator 1 and the first frequency range
The absolute value of the difference of 1/4 wavelength is less than the first particular value.In this way, since there are the first impedance matching circuits and the second impedance
With circuit, it can reduce the voltage standing wave ratio of antenna and reduce the thermal losses of match circuit, promote the performance of antenna.
The embodiment of the present invention also provides a kind of communication terminal, including above-mentioned antenna structure.
In the present embodiment, above-mentioned communication terminal can be mobile phone, tablet computer (Tablet Personal Computer),
Laptop computer (Laptop Computer), personal digital assistant (personal digital assistant, abbreviation PDA),
Mobile Internet access device (Mobile Internet Device, MID) or wearable device (Wearable Device) etc..
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form belongs within protection of the invention.
Claims (16)
1. a kind of antenna structure characterized by comprising antenna radiator, the first impedance matching circuit, the second impedance matching electricity
Road and signal source；
The first end of the antenna radiator is grounded, and is provided with feeding point on the antenna radiator, the feeding point with it is described
The distance between first end is greater than 0；
First impedance matching circuit includes the first inductance and first capacitor, wherein the first end of first inductance and institute
Feeding point connection is stated, the second end of first inductance connect with the first end of the first capacitor, and the of the first capacitor
Two ends are connect with the first end of the signal source；
The first end of second impedance matching circuit is connect with the second end of first inductance, the second impedance matching electricity
The second end on road is grounded；
The second end of the signal source is grounded；
The absolute value of the difference of 1/4 wavelength of the length of the antenna radiator and the first frequency range is less than the first particular value.
2. antenna structure according to claim 1, which is characterized in that second impedance matching circuit includes the second inductance
With the second capacitor；
The first end of second inductance is connect with the second end of first inductance, the second end ground connection of second inductance；
The first end of second capacitor is connect with the second end of first inductance, the second end ground connection of second capacitor.
3. antenna structure according to claim 2, which is characterized in that the ratio of the first length and the second length is greater than 1/
20, wherein length of first length between the feeding point and the first end of the antenna radiator, described second is long
Degree is the length of the antenna radiator.
4. antenna structure according to claim 3, which is characterized in that the first of the feeding point and the antenna radiator
Length between end, less than the length between the feeding point and the second end of the antenna radiator.
5. antenna structure according to claim 3, which is characterized in that the second of the feeding point and the antenna radiator
3/8 wavelength of length between end less than the second frequency range.
6. antenna structure according to claim 5, which is characterized in that the antenna structure is for generating the first resonance mode
With the second resonance mode, and the resonance frequency of first resonance mode be lower than second resonance mode resonance frequency.
7. antenna structure according to claim 6, which is characterized in that the resonance frequency of second resonance mode with it is described
The ratio of the resonance frequency of first resonance mode is less than 2.
8. antenna structure according to claim 7, which is characterized in that the resonance band of first resonance mode is described
First frequency range, the resonance band of second resonance mode are second frequency range, first frequency range and second frequency range
For frequency range different in 2.4~2.5GHz, 2.5~2.69GHz, 3.3~3.8GHz, 4.4~4.9GHz and 5.1~5.85GHz.
9. antenna structure according to claim 7, which is characterized in that the resonance band of first resonance mode is described
First frequency range, the resonance band of second resonance mode are second frequency range, first frequency range is 1.71~
2.17GHz, second frequency range are 2.3~2.69GHz.
10. antenna structure according to claim 6, which is characterized in that the resonance band of first resonance mode is institute
State the first frequency range, the resonance band of second resonance mode is second frequency range, first frequency range is 0.7~
0.96GHz, second frequency range are 1.71~2.17GHz or 2.3~2.69GHz.
11. antenna structure according to claim 6, which is characterized in that the resonance band of first resonance mode is institute
The first frequency range is stated, first frequency range is 1.55~1.62GHz；The resonance band of second resonance mode is second frequency
Section, second frequency range are 2.4~2.5GHz or 2.5~2.69GHz.
12. antenna structure according to claim 11, which is characterized in that the size of first inductance is 0~6nH.
13. antenna structure according to claim 11, which is characterized in that the size of second capacitor be 0.3pf~
1pf。
14. antenna structure according to claim 11, which is characterized in that the size of second inductance be 10nH~
68nH, the size of the first capacitor are 0.4pf~1.2pf.
15. antenna structure according to claim 1 or 2, which is characterized in that the antenna structure is the metal of communication terminal
Frame perhaps a part of metal-back or to be set to the intracorporal metallic object of the shell of communication terminal.
16. a kind of communication terminal, which is characterized in that including antenna structure described in any one of claims 1 to 15.
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| CN201811519720.3A CN109546310B (en) | 2018-12-12 | 2018-12-12 | Antenna structure and communication terminal |
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| CN201811519720.3A CN109546310B (en) | 2018-12-12 | 2018-12-12 | Antenna structure and communication terminal |
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| CN112909509A (en) * | 2021-01-20 | 2021-06-04 | 维沃移动通信有限公司 | Antenna and electronic device |
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