CN109546310B - Antenna structure and communication terminal - Google Patents
Antenna structure and communication terminal Download PDFInfo
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- CN109546310B CN109546310B CN201811519720.3A CN201811519720A CN109546310B CN 109546310 B CN109546310 B CN 109546310B CN 201811519720 A CN201811519720 A CN 201811519720A CN 109546310 B CN109546310 B CN 109546310B
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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Abstract
The invention provides an antenna structure and a communication terminal, wherein the antenna structure comprises: the antenna comprises 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 a feed point is arranged on the antenna radiator; the first impedance matching circuit comprises a first inductor and a first capacitor, wherein the first end of the first inductor is connected with the feed point, the second end of the first inductor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the first end of the signal source; the first end of the second impedance matching circuit is connected with the second end of the first inductor, and the second end of the second impedance matching circuit is grounded; the second end of the signal source is 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 a first specific value. Therefore, due to 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 the field of communications technologies, and in particular, to an antenna structure and a communication terminal.
Background
With the rapid development of terminal technology, communication terminals have become an essential tool in people's life, and bring great convenience to various aspects of user's life. The communication terminal in the shape of a metal middle frame or a full-metal battery cover, which is common in daily life, is generally provided with an antenna, and the antenna can work in a plurality of frequency bands, for example, the antenna can work in the frequency band ranges of 1.55-1.62 GHz and 2.4-2.5 GHz.
However, in the prior art, the voltage standing wave ratio of the antenna is relatively large, which results in relatively poor performance of the antenna.
Disclosure of Invention
The embodiment of the invention provides an antenna structure and a communication terminal, aiming at solving the problem of poor performance of an antenna.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides an antenna structure, including: the antenna comprises 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, a feed point is arranged on the antenna radiator, and the distance between the feed point and the first end is greater than 0;
the first impedance matching circuit comprises a first inductor and a first capacitor, wherein a first end of the first inductor is connected with the feeding point, a second end of the first inductor is connected with a first end of the first capacitor, and a second end of the first capacitor is connected with a first end of the signal source;
the first end of the second impedance matching circuit is connected with the second end of the first inductor, and the second end of the second impedance matching circuit is grounded;
the second end of the signal source is 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 a first specific value.
In a second aspect, an embodiment of the present invention further provides a communication terminal, including the above antenna structure.
An antenna structure according to an embodiment of the present invention includes: the antenna comprises 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, a feed point is arranged on the antenna radiator, and the distance between the feed point and the first end is greater than 0; the first impedance matching circuit comprises a first inductor and a first capacitor, wherein a first end of the first inductor is connected with the feeding point, a second end of the first inductor is connected with a first end of the first capacitor, and a second end of the first capacitor is connected with a first end of the signal source; the first end of the second impedance matching circuit is connected with the second end of the first inductor, and the second end of the second impedance matching circuit is grounded; the second end of the signal source is 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 a first specific value. Therefore, 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, the performance of the antenna can be improved, and the ratio of the resonant frequency of the second resonant mode to the resonant frequency of the first resonant mode can be less than 2.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an antenna structure according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of an antenna structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the impedance matching of the antenna provided by the embodiment of the invention;
fig. 4 is a schematic diagram comparing voltage standing wave ratios of antenna structures provided by embodiments of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an antenna structure according to an embodiment of the present invention, and as shown in fig. 1, the antenna structure includes an antenna radiator 1, a first impedance matching circuit, a second impedance matching circuit 2, and a signal source 3; the first end 11 of the antenna radiator 1 is grounded, a feed point 12 is arranged on the antenna radiator 1, and the distance between the feed point 12 and the first end 11 is greater than 0; the first impedance matching circuit comprises a first inductor L1 and a first capacitor C1, wherein a first end of the first inductor L1 is connected to the feeding point 12, a second end of the first inductor L1 is connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is connected to a first end of the signal source 3; a first end of the second impedance matching circuit 2 is connected to a second end of the first inductor L1, and a second end of the second impedance matching circuit 2 is grounded; the second end of the signal source 3 is grounded; the absolute value of the difference between the length of the antenna radiator 1 and the 1/4 wavelength of the first frequency band is smaller than a first specific value.
In this embodiment, the grounding may be performed by a motherboard ground, a metal shell, a metal floor, or the like, which is not limited in this embodiment. The antenna radiator 1 may include a second end 13, and a length between the feed point 12 and the second end 13 of the antenna radiator 1 may be greater than a length between the feed point 12 and the first end 11 of the antenna radiator 1. The first specific value may be an appropriate value, and a specific value may be selected according to an actually required precision, which is not limited in this embodiment. The absolute value of the difference between the length of the antenna radiator 1 and the 1/4 wavelength of the first frequency band is smaller than a first specific value, which can be understood as that the length of the antenna radiator 1 is close to 1/4 wavelength of the positioning frequency band (1.55-1.62 GHz, i.e. the first frequency band) and is larger than 3/16 wavelength and smaller than 3/8 wavelength, generally about 16-28 mm (the size is the size applied in a communication terminal, and the actual length of 1/4 wavelength in different media is different), and the preferred value may be 20 mm. The length between the feeding point 12 and the second end 13 of the antenna radiator 1 may be less than 3/8 wavelength of WIFI2.4G frequency band (2.4-2.5 GHz), and may be generally 0-18 mm, and preferably 15 mm.
It should be noted that the above specific dimensions are only for the requirement of locating the frequency band and WIFI2.4G frequency band. The specific size needs to be adjusted accordingly when the operating frequency bands are different, which is not limited in this embodiment, but still falls within the protection scope of the present scheme.
In this embodiment, the distance between the feeding point 12 and the first end 11 is greater than 0, that is, the feeding point 12 cannot be connected to the first end 11 of the antenna radiator 1. Since the first end 11 is the ground of the antenna radiator 1, the connection of the feed point 12 to this ground may result in antenna failure. So that the distance between the feed point 12 and the first end 11 is larger than 0, antenna failure can be avoided.
In this embodiment, the second impedance matching circuit 2 may be composed of an inductor and a capacitor connected in parallel; alternatively, the second impedance matching circuit 2 may be formed by connecting two sub-circuits in parallel, where one sub-circuit is formed by connecting a plurality of inductors in series, and the other sub-circuit is formed by connecting a plurality of capacitors in parallel, and so on.
In this way, due to the presence of the first impedance matching circuit and the second impedance matching circuit 2, the impedance at the signal source 3 can be brought to the vicinity of the impedance to be matched. For example, the impedance of the signal source 3 can be pulled to be about 50 ohms by the first impedance matching circuit and the second impedance matching circuit 2, so that the impedance can be better matched with the 50 ohm port impedance of the signal source 3, the voltage standing wave ratio of the antenna is reduced, and the performance of the antenna is improved. Moreover, the heat loss of the matching circuit can be reduced, and the ratio of the resonant frequency of the second resonant mode to the resonant frequency of the first resonant mode can be less than 2. The resonant frequency of the first resonant mode refers to a frequency corresponding to a point in the first resonant mode where the standing-wave ratio of the antenna voltage is minimum, and the resonant frequency of the second resonant mode refers to a frequency corresponding to a point in the second resonant mode where the standing-wave ratio of the antenna voltage is minimum.
Optionally, the second impedance matching circuit 2 includes a second inductor L2 and a second capacitor C2;
a first end of the second inductor L2 is connected with a second end of the first inductor L1, and a second end of the second inductor L2 is grounded;
the first end of the second capacitor C2 is connected to the second end of the first inductor L1, and the second end of the second capacitor C2 is grounded.
For better understanding of the above arrangement, please refer to fig. 2, and fig. 2 is a schematic structural diagram of an antenna structure according to an embodiment of the present invention. As shown in fig. 2, the second impedance matching circuit 2 is formed by connecting a second inductor L2 and a second capacitor C2 in parallel, and a first end of the second inductor L2 is connected to a second end of the first inductor L1, and a second end of the second inductor L2 is grounded; the first end of the second capacitor C2 is connected to the second end of the first inductor L1, and the second end of the second capacitor C2 is grounded.
In this embodiment, as the feeding point 12 moves away from the second end 13 of the antenna radiator 1, the impedance of the WIFI2.4G band (2.4-2.5 GHz) at the signal source 3 rotates clockwise from the third quadrant to the second quadrant. Referring to fig. 3, fig. 3 is a schematic diagram of antenna impedance matching according to an embodiment of the present invention.
As shown in fig. 3, the smith chart on the left represents the original impedance at the signal source 3 without the addition of the first inductor L1, the first capacitor C1, the second inductor L2 and the second capacitor C2. After the first inductor L1, the first capacitor C1, the second inductor L2 and the second capacitor C2 are added to the antenna structure, referring to the smith chart on the right, the impedance of the signal source 3 in two frequency bands (1.55 to 1.62GHz and 2.4 to 2.5GHz) is matched to be about 50 ohms.
And, further, reference may be made to the smith chart on the right in fig. 3. When the first inductor L1, the second capacitor C2 and the second inductor L2 are added, the impedance of the signal source 3 at 1.55-1.62 GHz is at the position A, and the impedance of the signal source 3 at 2.4-2.5 GHz is at the position B. When the first inductor L1, the first capacitor C1, the second inductor L2 and the second capacitor C2 are added, the impedance at the signal source 3 at 1.55-1.62 GHz is at the position C, and the impedance at the signal source 3 at 2.4-2.5 GHz is at the position D.
The second capacitor C2 and the second inductor L2 have a great influence on the resonant frequency (1.55-1.62 GHz) of the first resonant mode, and the first inductor L1 and the second capacitor C2 have a great influence on the resonant frequency (2.4-2.5 GHz) of the second resonant mode. Generally, the first inductor L1 can have a size of 0-6 nH, and a preferred value can be 3 nH. The second capacitor C2 may have a size of 0.3pf to 1pf, and a preferred value may be 0.5 pf. The size of the second inductor L2 may be 10nH to 68nH, and a preferred value may be 16 nH. The first capacitor C1 may have a size of 0.4p to 1.2pf, and a preferred value may be 0.5 pf.
It should be noted that, the specific values of the first capacitor C1, the second capacitor C2, the first inductor L1 and the second inductor L2 are only required for locating the frequency band and WIFI2.4G frequency band. The specific size needs to be adjusted accordingly when the operating frequency ranges are different, and this embodiment is not limited. But still fall within the scope of the present solution.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a comparison of the voltage standing wave ratio of the antenna structure. In fig. 4, a dotted line E and a dotted line F represent the voltage standing wave ratio of the antenna in the related art, and a solid line G and a solid line H represent the voltage standing wave ratio of the antenna after adding the first inductor L1, the first capacitor C1, the second inductor L2, and the second capacitor C2. It can be seen that the antenna mismatch loss is significantly improved. Meanwhile, since the second capacitor C2 is added, the series inductance, i.e., the first inductor L1, can be significantly reduced, and thus the heat loss of the first inductor L1 is significantly reduced, while the losses of the first capacitor C1 and the second capacitor C2 are very small, so that the heat loss of the impedance matching circuit can be significantly reduced.
Under the same antenna space, such as a full-screen communication terminal, the antenna distance is about 1.2mm (commonly referred to as antenna clearance). The total length of the antenna radiator 1 is 20 mm. Compare prior art and actual measurement antenna efficiency under this embodiment. The antenna efficiency of the positioning frequency band (1.55 to 1.62GHz) is improved by 1.2dB on average, the antenna efficiency of the WIFI2.4G frequency band (2.4 to 2.5GHz) is improved by 0.7dB on average, and the ratio of the resonant frequency of the second resonant mode to the resonant frequency of the first resonant mode is less than 2, and the following specific values are shown in the table:
the impedance matching circuit can also be applied to a main antenna (0.7-0.96 GHz, 1.71-2.69 GHz), such as two resonance modes of a low frequency band (0.7-0.96 GHz) and a medium frequency band (1.71-2.17 GHz) or two resonance modes of a low frequency band (0.7-0.96 GHz) and a high frequency band (2.3-2.69 GHz); the method can also be used for generating two resonance modes of a middle frequency band (1.71-2.17 GHz) and a high frequency band (2.3-2.69 GHz). It is only necessary to properly adjust the lengths between the antenna radiator 1 and the feeding point 12 and the second end 13 of the antenna radiator 1, and to adjust the value of the impedance matching circuit (the first impedance matching circuit or the second impedance matching circuit) in cooperation therewith. For example, two resonant modes of a low frequency band (0.7 to 0.96GHz) and a high frequency band (2.3 to 2.69GHz) are generated, the length of the antenna radiator 1 is lengthened to about 1/4 wavelengths of the low frequency band, for example, 40mm, and the length between the feeding point 12 and the second end 13 of the antenna radiator 1 is smaller than 3/8 wavelengths of the high frequency band (2.3 to 2.69GHz), generally 0 to 18mm, preferably 15mm, and at the same time, the second inductor L2 is appropriately adjusted to 33nH and the second capacitor C2 is adjusted to 0.8 pf.
The impedance matching circuit can also be applied to the following situation, the first frequency band and the second frequency band can be any frequency band of 2.4-2.5 GHz, 2.5-2.69 GHz, 3.3-3.8 GHz, 4.4-4.9 GHz and 5.1-5.85 GHz and the like, and the combination of the resonant frequency of the second resonant mode divided by the resonant frequency of the first resonant mode is less than 2.
Optionally, a ratio of a first length to a second length is greater than 1/20, where the first length is a length between the feed point 12 and the first end 11 of the antenna radiator 1, and the second length is a length of the antenna radiator 1.
In this embodiment, the ratio of the first length to the second length is greater than 1/20, so that the requirement of antenna impedance matching can be better met, and the performance of the antenna is improved.
Optionally, a length between the feeding point 12 and the first end 11 of the antenna radiator is smaller than a length between the feeding point 12 and the second end 13 of the antenna radiator.
In this embodiment, the length between the feeding point 12 and the first end 11 of the antenna radiator is smaller than the length between the feeding point 12 and the second end 13 of the antenna radiator, so that impedance matching can be performed better, and the performance of the antenna can be improved. When the feed point 12 is far away from the second end 13 of the antenna radiator, the influence of the feed structure on the antenna radiation can be reduced, the antenna radiation capability is improved, and the antenna performance is further improved.
Optionally, a length between the feeding point 12 and the second end 13 of the antenna radiator 1 is less than 3/8 wavelengths of the second frequency band.
In this embodiment, the length between the feeding point 12 and the second end 13 of the antenna radiator 1 is smaller than 3/8 wavelengths in the second frequency band, and may generally be 0 to 18mm, and preferably 15 mm. Since the length between the feeding point 12 and the second end 13 of the antenna radiator 1 is smaller than 3/8 wavelengths in the second frequency band, the requirement of antenna impedance matching can be met, and the performance of the antenna can be improved.
Optionally, the antenna structure is configured to generate a first resonance mode and a second resonance mode, and a resonance frequency of the first resonance mode is lower than a resonance frequency of the second resonance mode.
In this embodiment, the antenna structure is configured to generate a first resonance mode and a second resonance mode, and a resonance frequency of the first resonance mode is lower than a resonance frequency of the second resonance mode. Therefore, the voltage standing wave ratio of the first resonance mode and the second resonance mode can be reduced by matching with an impedance matching circuit, and the performance of the antenna is improved. It should be noted that the ratio of the resonance frequency of the second resonance mode to the resonance frequency of the first resonance mode may be less than 2.
Optionally, a ratio of the resonant frequency of the second resonant mode to the resonant frequency of the first resonant mode is less than 2.
In this embodiment, a ratio of the resonant frequency of the second resonant mode to the resonant frequency of the first resonant mode is less than 2, and the voltage standing wave ratio of the first resonant mode to the voltage standing wave ratio of the second resonant mode can be reduced by matching with an impedance matching circuit, so as to improve the performance of the antenna.
Optionally, the resonant frequency band of the first resonant mode is the first frequency band, the resonant frequency band of the second resonant mode is the second frequency band, and the first frequency band and the second frequency band are different frequency bands in 2.4 to 2.5GHz, 2.5 to 2.69GHz, 3.3 to 3.8GHz, 4.4 to 4.9GHz, and 5.1 to 5.85 GHz.
In this embodiment, under the condition that the ratio of the resonant frequency of the second resonant mode to the resonant frequency of the first resonant mode is less than 2, the first frequency band and the second frequency band are different frequency bands among 2.4 to 2.5GHz, 2.5 to 2.69GHz, 3.3 to 3.8GHz, 4.4 to 4.9GHz, and 5.1 to 5.85GHz, so that a suitable frequency band can be selected according to actual conditions, and the antenna can have better performance in different scenes.
Optionally, the resonant frequency band of the first resonant mode is the first frequency band, the resonant frequency band of the second resonant mode is the second frequency band, the first frequency band is 1.71 to 2.17GHz, and the second frequency band is 2.3 to 2.69 GHz.
In the embodiment, 1.71-2.17 GHz is a middle frequency band, and 2.3-2.69 GHz is a high frequency band, so that the antenna can cover the middle frequency band and the high frequency band, and the adaptability of the antenna is improved.
Optionally, the resonant frequency band of the first resonant mode is the first frequency band, the resonant frequency band of the second resonant mode is the second frequency band, the first frequency band is 0.7 to 0.96GHz, and the second frequency band is 1.71 to 2.17GHz or 2.3 to 2.69 GHz.
In this embodiment, 0.7 to 0.96GHz is a low band, 1.71 to 2.17GHz is a medium band, and 2.3 to 2.69GHz is a high band. Therefore, the antenna can cover a low frequency band and a middle frequency band, or cover the low frequency band and the high frequency band, so that a proper frequency band can be selected according to actual needs, and the antenna can have better performance in different scenes.
Optionally, the resonance frequency band of the first resonance mode is the first frequency band, and the first frequency band is 1.55 to 1.62 GHz; the resonance frequency band of the second resonance mode is the second frequency band, and the second frequency band is 2.4-2.5 GHz or 2.5-2.69 GHz.
In this embodiment, the first frequency band may also be referred to as a positioning frequency band, for example, for positioning services such as GPS and beidou.
Optionally, the size of the first inductor L1 is 0-6 nH.
In this embodiment, the first inductor L1 has a size of 0 to 6nH, and a preferable value may be 3 nH. The first inductance L1 may be sized according to the first frequency band.
Optionally, the size of the second capacitor C2 is 0.3pf to 1 pf.
In this embodiment, the second capacitor C2 has a size of 0.3pf to 1pf, and preferably has a value of 0.5 pf. The second capacitance C2 may be sized according to the first frequency band and the second frequency band.
Optionally, the size of the second inductor L2 is 10nH to 68nH, and the size of the first capacitor C1 is 0.4p to 1.2 pf.
In this embodiment, the size of the second inductor L2 is 10nH to 68nH, and a preferable value may be 16nH, and the size of the second inductor L2 may be determined according to the second frequency band. The first capacitor C1 has a size of 0.4pf to 1.2pf, and preferably has a value of 0.5pf, and the first capacitor C1 has a size determined according to the first frequency band and the second frequency band.
Optionally, the antenna structure is a part of a metal frame or a metal shell of the communication terminal, or a metal body disposed in a housing of the communication terminal.
In this embodiment, the antenna structure is a part of a metal frame or a metal shell of the communication terminal, or a metal body disposed in a housing of the communication terminal, and may be selected according to actual conditions, so as to satisfy a suitable disposing manner. The metal body may be made of FPC, LDS, magnesium alloy, stainless steel, or the like.
The antenna structure of the embodiment of the invention comprises an antenna radiator 1, a first impedance matching circuit, a second impedance matching circuit 2 and a signal source 3; the first end 11 of the antenna radiator 1 is grounded, a feed point 12 is arranged on the antenna radiator 1, and the distance between the feed point 12 and the first end 11 is greater than 0; the first impedance matching circuit comprises a first inductor L1 and a first capacitor C1, wherein a first end of the first inductor L1 is connected to the feeding point 12, a second end of the first inductor L1 is connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is connected to a first end of the signal source 3; a first end of the second impedance matching circuit 2 is connected to a second end of the first inductor L1, and a second end of the second impedance matching circuit 2 is grounded; the second end of the signal source 3 is grounded; the absolute value of the difference between the length of the antenna radiator 1 and the 1/4 wavelength of the first frequency band is smaller than a first specific value. Therefore, due to 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.
The embodiment of the invention also provides a communication terminal which comprises the antenna structure.
In this embodiment, the communication terminal may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or the like.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. An antenna structure, comprising: the antenna comprises 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, a feed point is arranged on the antenna radiator, and the distance between the feed point and the first end is greater than 0;
the first impedance matching circuit comprises a first inductor and a first capacitor, wherein a first end of the first inductor is connected with the feeding point, a second end of the first inductor is connected with a first end of the first capacitor, and a second end of the first capacitor is connected with a first end of the signal source;
the first end of the second impedance matching circuit is connected with the second end of the first inductor, and the second end of the second impedance matching circuit is grounded;
the second end of the signal source is grounded;
the absolute value of the difference value between the length of the antenna radiator and the 1/4 wavelength of the first frequency band is smaller than a first specific value;
the antenna structure is used for generating a first resonance mode and a second resonance mode, and the resonance frequency of the first resonance mode is lower than that of the second resonance mode;
the second impedance matching circuit comprises a second inductor and a second capacitor;
the first end of the second inductor is connected with the second end of the first inductor, and the second end of the second inductor is grounded;
the first end of the second capacitor is connected with the second end of the first inductor, and the second end of the second capacitor is grounded;
the ratio of the resonant frequency of the second resonant mode to the resonant frequency of the first resonant mode is less than 2.
2. The antenna structure of claim 1, wherein a ratio of a first length to a second length is greater than 1/20, wherein the first length is a length between the feed point and the first end of the antenna radiator, and wherein the second length is a length of the antenna radiator.
3. The antenna structure of claim 2, wherein a length between the feed point and the first end of the antenna radiator is less than a length between the feed point and the second end of the antenna radiator.
4. The antenna structure according to claim 2, characterized in that the length between the feed point and the second end of the antenna radiator is less than 3/8 wavelengths of the second frequency band.
5. The antenna structure according to claim 1, wherein the resonant frequency band of the first resonant mode is the first frequency band, the resonant frequency band of the second resonant mode is the second frequency band, and the first frequency band and the second frequency band are different frequency bands among 2.4 to 2.5GHz, 2.5 to 2.69GHz, 3.3 to 3.8GHz, 4.4 to 4.9GHz, and 5.1 to 5.85 GHz.
6. The antenna structure according to claim 1, wherein the resonant frequency band of the first resonant mode is the first frequency band, the resonant frequency band of the second resonant mode is the second frequency band, the first frequency band is 1.71-2.17 GHz, and the second frequency band is 2.3-2.69 GHz.
7. The antenna structure according to claim 1, wherein the resonant frequency band of the first resonant mode is the first frequency band, the resonant frequency band of the second resonant mode is the second frequency band, the first frequency band is 0.7-0.96 GHz, and the second frequency band is 1.71-2.17 GHz or 2.3-2.69 GHz.
8. The antenna structure according to claim 1, wherein the resonant frequency band of the first resonant mode is the first frequency band, and the first frequency band is 1.55-1.62 GHz; the resonance frequency band of the second resonance mode is the second frequency band, and the second frequency band is 2.4-2.5 GHz or 2.5-2.69 GHz.
9. The antenna structure according to claim 8, wherein the first inductance has a magnitude of 0-6 nH.
10. The antenna structure according to claim 8, characterized in that the second capacitance has a magnitude of 0.3pf to 1 pf.
11. The antenna structure according to claim 8, characterized in that the size of the second inductance is 10nH to 68nH and the size of the first capacitance is 0.4pf to 1.2 pf.
12. The antenna structure according to claim 1, characterized in that the antenna structure is a part of a metal frame or a metal casing of a communication terminal, or a metal body provided within a housing of a communication terminal.
13. A communication terminal, characterized in that it comprises an antenna structure according to any one of claims 1 to 12.
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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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| CN109546310B true CN109546310B (en) | 2021-01-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110380189A (en) * | 2019-07-23 | 2019-10-25 | 广东以诺通讯有限公司 | A kind of miniature antenna and terminal |
| CN110649373A (en) * | 2019-09-19 | 2020-01-03 | 维沃移动通信有限公司 | Antenna structure and terminal |
| CN110994178B (en) * | 2019-12-31 | 2022-01-28 | 维沃移动通信有限公司 | Antenna structure and electronic equipment |
| CN112072291A (en) * | 2020-09-08 | 2020-12-11 | 北京字节跳动网络技术有限公司 | Antenna structure and terminal |
| CN112397902B (en) * | 2020-10-23 | 2023-06-20 | Oppo广东移动通信有限公司 | Antenna, impedance matching method thereof and terminal |
| CN112909509B (en) * | 2021-01-20 | 2023-08-22 | 维沃移动通信有限公司 | Antenna and electronic device |
| CN113964509A (en) * | 2021-10-08 | 2022-01-21 | 东电检测技术服务(天津)有限公司 | GNSS positioning and NB-IOT communication antenna |
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