CN108011187B - Antenna system and mobile terminal adopting same - Google Patents
Antenna system and mobile terminal adopting same Download PDFInfo
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- CN108011187B CN108011187B CN201711181596.XA CN201711181596A CN108011187B CN 108011187 B CN108011187 B CN 108011187B CN 201711181596 A CN201711181596 A CN 201711181596A CN 108011187 B CN108011187 B CN 108011187B
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- radiator
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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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
-
- 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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention relates to the field of radio communication, and discloses an antenna system and a mobile terminal adopting the same. An antenna system comprises an antenna soft medium layer, wherein a radiating body part, a feeding part and a grounding part are arranged on the antenna soft medium layer, and the radiating body part is respectively and electrically connected with the feeding part and the grounding part through a matching circuit; the radiator part comprises a first radiator, a second radiator and a third radiator which are connected with each other, the first radiator generates low-frequency resonant frequency, the second radiator and the third radiator respectively generate high-frequency resonant frequency, the first radiator is connected with a fourth radiator, and the fourth radiator adjusts low-frequency length and high-frequency resonant frequency. A mobile terminal comprises the antenna system. The antenna system and the mobile terminal adopting the same can adjust the bandwidth of the FPC antenna adopting the coaxial line and meet the multi-frequency requirement of the antenna.
Description
Technical Field
The present invention relates to the field of radio communications, and in particular, to an antenna system and a mobile terminal using the same.
Background
The early communication schemes of devices such as notebook computers and tablet computers mostly adopt WLAN solutions, and with the continuous deep of 4G and the continuous evolution of 5G, devices such as notebook computers and tablet computers increasingly introduce mobile communication technologies, so that mobile terminal devices have higher and higher requirements on antennas in communication systems, and the antennas are required to have wider frequency bands.
However, in order to obtain the best antenna performance in the prior art, there are two main technical solutions: one is that the position of the antenna is relatively fixed by reserving a feed point on the mainboard, the antenna must be fed to the mainboard through a gold finger, the design limit on the ID and the MD is relatively large, the corresponding space and position of the antenna must be reserved in the range near the feed point, and no interference source or loss device can be arranged nearby; the other is to buckle the coaxial cable on the mainboard, and the antenna selects the corresponding position in the organism, and this kind of mode antenna position selection is comparatively simple compared with first scheme, but the antenna is difficult to obtain good bandwidth under general condition, and the antenna design form is comparatively single, because the antenna matching circuit is too far away, adopts the FPC antenna of coaxial line can't use the matching circuit to adjust the bandwidth.
Disclosure of Invention
The invention aims to provide an antenna system and a mobile terminal adopting the same, which can adjust the bandwidth of an FPC antenna adopting a coaxial line and meet the multi-frequency requirement of the antenna.
In order to achieve the purpose, the invention adopts the following technical scheme:
an antenna system comprises an antenna soft medium layer, wherein a radiating body part, a feeding part and a grounding part are arranged on the antenna soft medium layer, and the radiating body part is respectively and electrically connected with the feeding part and the grounding part through a matching circuit;
the radiator part comprises a first radiator, a second radiator and a third radiator which are connected with each other, the first radiator generates low-frequency resonant frequency, the second radiator and the third radiator respectively generate high-frequency resonant frequency, the first radiator is connected with a fourth radiator, and the fourth radiator adjusts low-frequency length and high-frequency resonant frequency.
As a preferable technical scheme, the length of the first radiator is 30mm-50mm, and the width of the first radiator is 2mm-5 mm.
As a preferred technical scheme, the high-frequency resonant frequency generated by the second radiator is 1700-2100MHz, the length of the second radiator is 15mm-35mm, and the width of the second radiator is 1.2mm-3.5 mm.
As a preferred technical scheme, the high-frequency resonant frequency generated by the third radiator is 2100-2700MHz, the length of the third radiator is 5mm-17mm, and the width of the third radiator is 1.5mm-6 mm.
Preferably, the fourth radiator has a length of 3mm to 15mm and a width of 1.5mm to 6 mm.
As a preferred technical solution, the grounding portion includes an adjusting body, the adjusting body is provided with a coaxial line grounding point connected with the coaxial line outer conductor, and the feeding portion is provided with a coaxial line feeding point connected with the coaxial line inner conductor.
As a preferred technical scheme, the adjusting body is provided with a slot for adjusting the impedance of the antenna and the high-frequency resonant frequency, the opening of the slot faces to a coaxial line feed point, the length of the slot is 5mm-15mm, and the width of the slot is 0.2mm-2 mm.
As a preferred technical solution, the matching circuit includes a first variable capacitor, a second variable capacitor and a variable inductor, the first variable capacitor, the second variable capacitor and the radiator part are connected in parallel to one pin of the variable inductor, and the other pin of the variable inductor is connected to a signal line of the coaxial line;
the adjusting body is provided with a grounding sheet, and the first variable capacitor, the second variable capacitor, the radiator part and the grounding wire of the coaxial wire are respectively and electrically connected with the grounding sheet.
According to the preferable technical scheme, the antenna soft medium layer is provided with a first bending part, a second bending part and a third bending part, and the antenna soft medium layer is bent along the first bending part, the second bending part and the third bending part to form four faces for fixing the antenna.
A mobile terminal comprising the antenna system of any of the above.
The invention has the beneficial effects that: the invention sets the first radiator, the second radiator and the third radiator which are connected with each other, the structures of the three radiators are different, different resonant frequencies of the antenna are realized, the first radiator is connected with the fourth radiator, and the fourth radiator is used for adjusting the low-frequency length and the high-frequency resonant frequency.
Drawings
Fig. 1 is a schematic structural diagram of an antenna system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a matching circuit according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating a distribution of bending portions on the antenna soft dielectric layer according to an embodiment of the present invention;
FIG. 4 is an analysis diagram of the performance of an antenna tuned to a matching circuit according to an embodiment of the present invention;
fig. 5 is a graph comparing antenna efficiency data of an antenna according to an embodiment of the present invention corresponding to low frequency band increased inductance and no increased inductance;
fig. 6 is a graph comparing the efficiency data of the antenna according to the embodiment of the present invention with respect to the antenna with the increased inductance in the high frequency band and without the increased inductance.
In the figure:
1. an antenna soft medium layer;
11. a radiator portion; 111. a first radiator; 112. a second radiator; 113. a third radiator; 114. a fourth radiator;
12. a power feeding portion; 121. a coaxial line feed point;
13. a ground portion; 131. an adjuster; 132. a coaxial line ground point; 133. grooving; 134. a ground plate;
14. a coaxial line;
15. a matching circuit; 151. a first variable capacitance; 152. a second variable capacitance; 153. a variable inductance;
16. a first bent portion; 17. a second bent portion; 18. a third bending part.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1 to 3, the present embodiment provides an antenna system, which includes an antenna soft medium layer 1, where the antenna soft medium layer 1 is provided with a radiator portion 11, a feed portion 12, and a ground portion 13, and the radiator portion 11 is electrically connected to the feed portion 12 and the ground portion 13 through a matching circuit 15, respectively.
The radiator portion 11 includes a first radiator 111, a second radiator 112, and a third radiator 113 connected to each other, the first radiator 111 generates a low frequency resonance frequency, the second radiator 112 and the third radiator 113 respectively generate a high frequency resonance frequency, the first radiator 111 is connected to a fourth radiator 114, and the fourth radiator 114 adjusts a low frequency length and the high frequency resonance frequency.
The high-frequency resonant frequency generated by the second radiator 112 is 1700-2100MHz, and the high-frequency resonant frequency generated by the third radiator 113 is 2100-2700 MHz.
The length of the first radiator 111 is 30mm-50mm, the width thereof is 2mm-5mm, preferably the length of the first radiator 111 is 35mm-45mm, and the width thereof is 2.5mm-4.5 mm; the length of the second radiator 112 is 15mm-35mm, the width thereof is 1.2mm-3.5mm, preferably the length of the second radiator 112 is 20mm-30mm, and the width thereof is 1.3mm-2.5 mm; the length of the third radiator 113 is 5mm-17mm, the width thereof is 1.5mm-6mm, preferably the length of the third radiator 113 is 6mm-10mm, and the width thereof is 2mm-4 mm; the length of the fourth radiator 114 is 3mm-15mm, and the width thereof is 1.5mm-6mm, preferably the length of the fourth radiator 114 is 5mm-10mm, and the width thereof is 3mm-5 mm.
Specifically, the radiator portion 11 is disposed on the upper portion of the antenna soft medium layer 1, the ground portion 13 is disposed below the radiator portion 11, the ground portion 13 includes a regulating body 131, a groove is disposed on the regulating body 131 and close to the radiator portion 11, a notch of the groove faces the radiator portion 11, and the power feeding portion 12 is disposed in the groove.
The adjusting body 131 is provided with a slot 133, the feeding portion 12 is provided with a coaxial feeding point 121, the slot of the slot 133 faces the coaxial feeding point 121, and the adjusting body 131 near the slot is provided with a coaxial grounding point 132, an outer conductor of the coaxial line 14 is used for transmitting low-level signals, the outer conductor is connected with the coaxial grounding point 132, and an inner conductor of the coaxial line 14 is used for transmitting high-level signals, and is connected with the coaxial feeding point 121. The electrical balance between the antenna and the main ground can be enhanced by the coaxial line grounding point 132, and the efficiency of the antenna is improved.
Specifically, the length of the slot 133 is 5mm to 15mm, the width thereof is 0.2mm to 2mm, and preferably, the length of the slot 133 is 7mm to 12mm, and the width thereof is 0.3mm to 1.5 mm. The slot 133 provides for adjustment of the overall antenna impedance and coupling out of resonance at high frequencies, improving antenna efficiency.
The matching circuit 15 includes a first variable capacitor 151, a second variable capacitor 152 and a variable inductor 153, the first variable capacitor 151, the second variable capacitor 152 and the radiator part 11 are connected in parallel to one pin of the variable inductor 153, and the other pin of the variable inductor 153 is connected to a signal line of the coaxial line 14; the adjustable range value of the first variable capacitor 151 is 0-10pF, the adjustable range value of the second variable capacitor 152 is 0-10pF, and the adjustable range value of the variable inductor 153 is 1-10 nH.
The adjusting body 131 is provided with a grounding strip 134, and the first variable capacitor 151, the second variable capacitor 152, the radiator portion 11 and the grounding line of the coaxial line 14 are respectively connected with the grounding strip 134 of the grounding portion 13.
Specifically, the first variable capacitor 151, the second variable capacitor 152, and the variable inductor 153 are all chip elements, one pin of the first variable capacitor 151 and one pin of the second variable capacitor 152 are respectively disposed on the radiator of the radiator portion 11, the other pin of the first variable capacitor 151 and the other pin of the second variable capacitor 152 are respectively disposed on the adjustment body 131, one pin of the variable inductor 153 is disposed on the radiator of the radiator portion 11, and the other pin of the variable inductor 153 is disposed on the feeding portion 12. The whole impedance and the bandwidth of the antenna are adjusted by adopting the LC circuit formed by the patch intervals, when the LC circuit is adjusted, an antenna standing wave pattern is obtained according to actual adjusting equipment, and the antenna bandwidth and the standing wave depth are increased by changing the capacitance values of the first variable capacitor 151 and the second variable capacitor 152 and the inductance value of the variable inductor 153.
As shown in fig. 3, in this embodiment, a first bent portion 16, a second bent portion 17 and a third bent portion 18 are disposed on the antenna soft dielectric layer 1 and are parallel to each other, the first bent portion 16 is disposed between the first radiator 111 and the second radiator 112, the second bent portion 17 is disposed between the third radiator 113 and the ground portion 13, the ground plate 134 is disposed below the slot 133, the third bent portion 18 is disposed between the ground plate 134 and the slot 133, the antenna soft dielectric layer 1 is bent into four sides by the arrangement of the bent portions, a plastic carrier or an electronic component is used as a support, and the four sides are respectively attached to the support, so that the occupied space of the antenna is greatly reduced, and the antenna is miniaturized.
The embodiment also provides a mobile terminal comprising the antenna system.
Fig. 4 shows an antenna performance analysis diagram of the antenna system applied to the smart tablet computer and the adjusting matching circuit 15. The frequency band of the antenna in the tablet computer is low frequency: 700MHz-960MHz, high frequency: 1700MHz-2700MHz, the aerial is pasted on a horn bracket, the aerial is connected with soft dielectric layer 1 through the coaxial line, soft dielectric layer 1 is buckled on the mother board again, LC regulating circuit has been welded on soft dielectric layer, LC regulating circuit is used for optimizing and adjusting the aerial bandwidth.
In the present embodiment, the value of the variable inductor 153 is adjusted to 3.9nH, the length of the first radiator 111 is set to 40.7mm, the width is set to 4mm, the length of the second radiator 112 is set to 21mm, the width is set to 1.3mm, the length of the third radiator 113 is set to 6mm, the width is set to 2.1mm, the length of the fourth radiator 114 is set to 7.8mm, the width is set to 4mm, the length of the slot 133 is set to 10mm, and the width is set to 0.6 mm.
Fig. 4 shows the return loss actual measurement pattern before the inductor is not added, and the line b shows the return loss actual measurement pattern after the inductor is added, and it can be seen from fig. 4 that after the inductance value is adjusted, the bandwidth and the return loss depth of the whole antenna are obviously improved, and the efficiency of the antenna is obviously improved.
Fig. 5 is a graph showing comparison between antenna efficiency data of an antenna with inductance increased in a low frequency band and antenna efficiency data of an antenna without inductance increased in a low frequency band, where a line c in the graph is a data acquisition graph of the antenna with inductance increased in a low frequency band and the efficiency of the antenna is improved by adjusting the value of the inductance, and a line d is a data acquisition graph of the antenna with efficiency in a normal debugging mode without inductance increased in a low frequency band.
Fig. 6 is a graph showing comparison between antenna efficiency data of an antenna corresponding to a high-frequency band increased inductance and antenna efficiency data of an antenna not increased inductance, where a line e is a data acquisition graph of the antenna increasing inductance in a high-frequency band and improving the efficiency of the antenna by adjusting the value of the inductance, and a line f is a data acquisition graph of the antenna efficiency in a normal debugging mode without increasing inductance in a high-frequency band.
As can be seen from fig. 5 and 6, by adjusting the LC circuit and adjusting the value of the inductance, the antenna efficiency is improved by 10 to 20% in the whole frequency band of the corresponding low frequency and high frequency, and the antenna efficiency is significantly improved.
The antenna resonance is realized by adjusting different radiating bodies of the antenna, the integral impedance and the antenna bandwidth can be increased by adjusting the LC circuit, the antenna can be placed at a position with better antenna environment and smaller interference source relatively searched in the machine body by the coaxial feed mode, the difficulty of the requirement of the whole machine design on the antenna position is reduced, and meanwhile, the antenna design efficiency is greatly improved, so that the project period is shortened, and the antenna resonance circuit has stronger universality and practicability.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The antenna system is characterized by comprising an antenna soft medium layer (1), wherein a radiator part (11), a feed part (12) and a grounding part (13) are arranged on the antenna soft medium layer (1), and the radiator part (11) is electrically connected with the feed part (12) and the grounding part (13) through a matching circuit (15) respectively;
the radiator part (11) comprises a first radiator (111), a second radiator (112) and a third radiator (113) which are connected with each other, the first radiator (111) generates low-frequency resonance frequency, the second radiator (112) and the third radiator (113) respectively generate high-frequency resonance frequency, the first radiator (111) is connected with a fourth radiator (114), and the fourth radiator (114) adjusts low-frequency length and high-frequency resonance frequency;
the grounding part (13) comprises a regulating body, a coaxial line grounding point (132) connected with an outer conductor of the coaxial line (14) is arranged on the regulating body (131), and a coaxial line feeding point (121) connected with an inner conductor of the coaxial line (14) is arranged on the feeding part (12);
a groove is formed in the adjusting body (131) close to the radiator part (11), the notch of the groove faces the radiator part (11), and the feeding part (12) is arranged in the groove;
the adjusting body (131) is provided with a slot (133) for adjusting the impedance of the antenna and the high-frequency resonant frequency, the opening of the slot (133) faces the coaxial line feeding point (121), and the opening of the slot (133) is arranged right opposite to the coaxial line feeding point (121).
2. The antenna system according to claim 1, characterized in that the first radiator (111) has a length of 30mm-50mm and a width of 2mm-5 mm.
3. The antenna system of claim 1, wherein the second radiator (112) generates a high-frequency resonant frequency of 1700-2100MHz, and the length of the second radiator (112) is 15mm-35mm and the width thereof is 1.2mm-3.5 mm.
4. The antenna system according to claim 1, wherein the high frequency resonant frequency generated by the third radiator (113) is 2100-2700MHz, and the length of the third radiator (113) is 5mm-17mm and the width thereof is 1.5mm-6 mm.
5. The antenna system according to claim 1, characterized in that the fourth radiator (114) has a length of 3-15 mm and a width of 1.5-6 mm.
6. The antenna system of claim 1, wherein the slot (133) has a length of 5mm-15mm and a width of 0.2mm-2 mm.
7. The antenna system according to claim 1, wherein the matching circuit (15) comprises a first variable capacitor (151), a second variable capacitor (152) and a variable inductor (153), the first variable capacitor (151), the second variable capacitor (152) and the radiator portion (11) are connected in parallel to one pin of the variable inductor (153), and the other pin of the variable inductor (153) is connected to a signal line of a coaxial line (14);
be equipped with ground lug (134) on regulating body (131), the earth connection of first variable capacitor (151), second variable capacitor (152), irradiator part (11) and coaxial line (14) is connected with ground lug (134) electricity respectively.
8. The antenna system according to any one of claims 1 to 7, wherein a first bending portion (16), a second bending portion (17) and a third bending portion (18) are disposed on the antenna soft dielectric layer (1), and the antenna soft dielectric layer (1) is bent along the first bending portion (16), the second bending portion (17) and the third bending portion (18) to form four faces for fixing the antenna.
9. A mobile terminal, characterized in that it comprises an antenna system according to any of claims 1-8.
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| CN201711181596.XA CN108011187B (en) | 2017-11-23 | 2017-11-23 | Antenna system and mobile terminal adopting same |
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| CN201711181596.XA CN108011187B (en) | 2017-11-23 | 2017-11-23 | Antenna system and mobile terminal adopting same |
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| CN108011187A CN108011187A (en) | 2018-05-08 |
| CN108011187B true CN108011187B (en) | 2020-10-13 |
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| CN114171902B (en) * | 2021-11-24 | 2024-02-20 | 上海移为通信技术股份有限公司 | Antenna device and electronic equipment |
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| CN101465465A (en) * | 2007-12-20 | 2009-06-24 | 智易科技股份有限公司 | Double-frequency antenna |
| CN203434279U (en) * | 2013-09-03 | 2014-02-12 | 纬创资通股份有限公司 | Multi-frequency antenna and portable electronic device |
| CN104396086A (en) * | 2014-03-28 | 2015-03-04 | 华为终端有限公司 | Antenna and mobile terminal |
| CN204668472U (en) * | 2015-04-27 | 2015-09-23 | 深圳市大显科技有限公司 | A kind of coupled handset antenna |
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| CN201285795Y (en) * | 2008-11-26 | 2009-08-05 | 惠州市硕贝德通讯科技有限公司 | Flat plate multi-frequency antenna for notebook computer |
| US20110221638A1 (en) * | 2009-05-07 | 2011-09-15 | Ethertronics, Inc. | Internal lc antenna for wireless communication device |
| CN102468531B (en) * | 2010-11-04 | 2015-05-06 | 广达电脑股份有限公司 | Multi-frequency antenna |
| CN202339975U (en) * | 2011-11-23 | 2012-07-18 | 深圳市濠璟科技有限公司 | Novel FPC (Flexible Printed Circuit) antenna structure |
| CN103840264A (en) * | 2012-11-21 | 2014-06-04 | 富士康(昆山)电脑接插件有限公司 | Multi-frequency antenna |
| CN204029983U (en) * | 2014-08-15 | 2014-12-17 | 惠州硕贝德无线科技股份有限公司 | A kind of panel computer LTE antenna |
| CN106033834B (en) * | 2015-03-13 | 2019-05-24 | 神讯电脑(昆山)有限公司 | Antenna structure |
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|---|---|---|---|---|
| CN101465465A (en) * | 2007-12-20 | 2009-06-24 | 智易科技股份有限公司 | Double-frequency antenna |
| CN203434279U (en) * | 2013-09-03 | 2014-02-12 | 纬创资通股份有限公司 | Multi-frequency antenna and portable electronic device |
| CN104396086A (en) * | 2014-03-28 | 2015-03-04 | 华为终端有限公司 | Antenna and mobile terminal |
| CN204668472U (en) * | 2015-04-27 | 2015-09-23 | 深圳市大显科技有限公司 | A kind of coupled handset antenna |
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