CN106058434B - A kind of antenna applied to mobile terminal - Google Patents
A kind of antenna applied to mobile terminal Download PDFInfo
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- CN106058434B CN106058434B CN201610402839.7A CN201610402839A CN106058434B CN 106058434 B CN106058434 B CN 106058434B CN 201610402839 A CN201610402839 A CN 201610402839A CN 106058434 B CN106058434 B CN 106058434B
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- 230000005404 monopole Effects 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims abstract description 9
- 230000005855 radiation Effects 0.000 claims description 115
- 239000003990 capacitor Substances 0.000 claims description 14
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 abstract 1
- 230000006698 induction Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 12
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010295 mobile communication Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
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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
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- 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
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses a kind of antennas applied to mobile terminal, including upper layer and lower layer printed board；Lower layer's printed board front is printed with monopole radiating element, and monopole radiating element is electrically connected metal feeding point；A part for covering radiator of the copper as antenna of lower layer's printing back, while being used as the main floor of antenna；Upper layer printed board front is printed with short-circuit radiating element, and what short-circuit radiating element was connected to lower layer's printing back covers copper.By distinguishing the sub- radiating element of printed monopole and short-circuit radiating element in upper layer and lower layer printed board, the resonance for generating different frequency allows antenna to work in multiband, effectively reduces the area of antenna occupancy, make the compact-sized of antenna, is advantageously implemented the miniaturization of antenna.The monopole radiating element of directly excitation lower layer, and it is coupled to the short-circuit radiating element on upper layer, distributed LC match circuit may be implemented, increase input port capacitive reactance, and introduce distribution induction reactance characteristic.
Description
Technical Field
The invention relates to the field of mobile terminal communication, in particular to an antenna applied to a mobile terminal.
Background
The antenna, an important component of a mobile terminal, is an important radio device for transmitting and receiving electromagnetic waves, and the performance of the antenna is directly related to the communication quality of a communication system, and plays a very important role in the overall performance of mobile communication. The continuous update of the current mobile communication system provides new index requirements for mobile terminal antennas, and the design and research of novel miniaturized antennas which meet the requirements of wider bandwidth, multiple frequency bands and high efficiency and can better meet various requirements of the system are important research subjects in the field of terminal antennas at home and abroad at present.
Nowadays, various mobile communication systems coexist and peripheral wireless device signals such as bluetooth, Wi-Fi, GPS and the like, so that an antenna needs to operate in multiple frequency bands and needs a wider bandwidth to ensure good communication quality.
Disclosure of Invention
In order to meet the requirements of wide bandwidth and multiple frequency bands of the antenna and realize miniaturization of the antenna, the invention provides the antenna applied to the mobile terminal.
The antenna applied to the mobile terminal comprises an upper layer of printed board and a lower layer of printed board;
the front surface of the lower printed board is printed with a monopole radiation unit, and the monopole radiation unit is electrically connected with a metal feed point; the copper-clad part on the back of the lower printed board is used as a part of a radiator of the antenna and is also used as a main floor of the antenna;
and the front surface of the upper-layer printed board is printed with a short-circuit radiation unit, and the short-circuit radiation unit is connected to copper coated on the back surface of the lower-layer printed board.
And an inductor and/or a capacitor are loaded between the upper and lower layers of printed boards.
The antenna also comprises a bent radiation sheet;
one end of the bent radiation piece is connected to the short-circuit radiation unit, and the other end of the bent radiation piece extends out of the plane where the short-circuit radiation unit is located.
Wherein, the monopole radiation unit is used for generating high-frequency resonance within the range of 1630-; the short circuit radiation unit is used for generating low-frequency resonance in the range of 680-1080 MHz.
The monopole radiation unit is in an inverted F shape and consists of a first microstrip line, a second microstrip line and a third microstrip line which are printed on the front face of the lower printed board; wherein,
the first microstrip line and the second microstrip line are parallel to each other and perpendicular to the third microstrip line respectively, the first end of the first microstrip line is connected to the first end of the third microstrip line, the first end of the second microstrip line is connected to the third microstrip line, the distance between the first end of the second microstrip line and the second end of the third microstrip line is 19mm, and the second end of the second microstrip line is electrically connected to the metal feed point;
the first microstrip line is 6mm long and 4mm wide; the length of the second microstrip line is 7mm, and the width of the second microstrip line is 1.5 mm; the third microstrip line is 30.5mm long and 2.5mm wide; the metal feed point is rectangular, and is 2mm long and 1.5mm wide.
The short circuit radiation unit is T-shaped and consists of a fourth microstrip line and a fifth microstrip line which are printed on the front surface of the upper printed board; wherein,
the fourth microstrip line is perpendicular to the fifth microstrip line, the first end of the fourth microstrip line is connected to the fifth microstrip line, the distance between the first end of the fourth microstrip line and the first end of the fifth microstrip line is 7.5mm, and the distance between the second end of the fourth microstrip line and the second end of the fifth microstrip line is 31.5 mm;
the length of the fourth microstrip line is 11mm, and the width of the fourth microstrip line is 1 mm; the length of the fifth microstrip line is 40mm, and the width of the fifth microstrip line is 3 mm.
The second end of the fourth microstrip line is loaded with an inductor and is connected to copper-clad on the back of the lower printed board through a first metalized through hole; the size of the inductor is 100 nH;
a first end of the fifth microstrip line is loaded with a capacitor and is connected to a first end of the third microstrip line through a second metalized via hole; the capacitance is 200pF in size.
The bent radiation sheet is rectangular, and is 50mm long and 6mm wide;
the long edge of the bent radiation piece is connected with the fifth microstrip line, and the wide edge of the bent radiation piece is aligned with the first end of the fifth microstrip line;
the bent radiation sheet is perpendicular to the upper-layer printed board.
The third microstrip line is parallel to the fifth microstrip line, and the first end of the third microstrip line is aligned with the first end of the fifth microstrip line up and down.
The upper and lower layers of printed boards are rectangular glass fiber epoxy resin copper-clad plates, the height is 140mm, the width is 70mm, the dielectric constant is 4.4, and the thickness is 0.8 mm;
the clearance occupied by the antenna is 15mm by 50mm, and the size of a system clean floor is 125mm by 70 mm;
and two sides of the first end of the fifth microstrip line are respectively aligned with the top edge and the side edge of the upper-layer printed board.
The embodiment of the invention has the beneficial effects that: the monopole radiation unit and the short-circuit radiation unit are respectively printed on the upper layer of printed board and the lower layer of printed board, and can generate resonance with different frequencies, so that the antenna can work in multiple frequency bands; the upper layer and the lower layer of the monopole radiation unit and the short circuit radiation unit are overlapped, so that the area occupied by the antenna is reduced, the structure of the antenna can be compact, and the miniaturization of the antenna is realized; the distributed LC matching circuit can be realized by directly exciting the monopole radiation unit on the lower layer and coupling the monopole radiation unit to the short-circuit radiation unit on the upper layer, the capacitive reactance of an input port can be increased by coupling feed, and the short-circuit radiation unit can introduce the distributed inductive reactance characteristic.
In a preferred embodiment, lumped parameter elements such as inductors and capacitors are loaded between an upper layer of printed board and a lower layer of printed board, and the frequency of a resonance point of the antenna can be changed by adjusting the numerical value of the lumped parameter elements, so that the bandwidth is widened, and the antenna can obtain better port matching in a required specific frequency band; the resonant frequency is not required to be changed by designing a complex antenna shape, the shape of the antenna is simplified, the antenna is easier to process and debug, and the method is beneficial to controlling the cost and facilitating the batch production and processing.
In another preferred embodiment, a bent radiation sheet is connected to the short-circuit radiation unit, and the other end of the bent radiation sheet extends out of the plane of the short-circuit radiation unit, so that the radiation area of the antenna is increased, the radiation impedance of the antenna is also increased, and the shielding effect of the main floor of the antenna on the radiation body of the antenna is reduced due to the fact that the shielding effect of the main floor of the antenna on the bent radiation sheet is reduced.
Drawings
Fig. 1 is a perspective view of an antenna with a floor for a mobile terminal according to an embodiment of the present invention;
fig. 2 is a perspective view of an antenna without a floor, applied to a mobile terminal according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a monopole radiation element applied to an antenna of a mobile terminal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a short-circuit radiation unit applied to an antenna of a mobile terminal according to an embodiment of the present invention;
fig. 5 is a graph of simulation S11 applied to an antenna of a mobile terminal according to a preferred embodiment of the present invention;
fig. 6 is a simulated directional diagram of an antenna applied to a mobile terminal according to a preferred embodiment of the present invention, wherein fig. 6(a) is a directional diagram of an x-y plane, fig. 6(b) is a directional diagram of a y-z plane, and fig. 6(c) is a directional diagram of an x-z plane.
Detailed Description
The design concept of the invention is as follows: the coupling feed and the short-circuit radiation unit are adopted to realize the distributed LC matching circuit, the lumped parameter element is loaded on the basis, and the required working frequency is obtained by adjusting the lumped parameter value to change the resonance point frequency of the antenna, so that the mobile terminal antenna with a wide frequency band is realized, the frequency bands of a plurality of mobile communication services can be covered, and the requirement of antenna miniaturization is met.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a perspective view of an antenna with a floor for a mobile terminal according to an embodiment of the present invention; fig. 2 is a perspective view of an antenna without a floor, applied to a mobile terminal according to an embodiment of the present invention. With reference to fig. 1 and 2, an antenna applied to a mobile terminal according to an embodiment of the present invention includes a lower printed board 1 and an upper printed board 2.
The front side of the lower printed board 1 is printed with monopole radiating elements 7. The monopole radiating element 7 is electrically connected to a metal feed point 10. The copper clad on the back of the lower printed board 1 serves as a part of a radiator of the antenna to increase the radiation area of the antenna, and the copper clad on the back of the printed board 1 also serves as a main floor of the antenna to simulate the system ground of the mobile terminal device.
The upper printed board 2 has a short-circuit radiation unit 4 printed on the front surface thereof. The back of the upper printed board 2 has no copper clad, and the short circuit radiation unit 4 is connected to the copper clad of the back of the lower printed board 1. Since the short-circuit radiation element 4 is connected to the main floor of the antenna, it is referred to as a short-circuit radiation element.
The monopole radiating element 7 and the short-circuit radiating element 4 can generate resonance with different frequencies, so that the antenna can work in multiple frequency bands. Compared with the prior art that all radiation branches of the antenna are manufactured in the same plane, the short-circuit radiation unit 4 and the monopole radiation unit 7 are respectively printed on the upper layer printed board and the lower layer printed board and are arranged in an overlapping mode, the occupied area of the antenna is reduced, the structure of the antenna is compact, and the miniaturization of the antenna is facilitated. The monopole radiation unit 7 on the lower layer is directly excited through the feed point 10 and is coupled to the short-circuit radiation unit 4 on the upper layer, the short-circuit radiation unit 4 is connected to the copper-coated layer on the back of the lower printed board 1, namely the main floor of the antenna, so that a distributed LC matching circuit is realized, the capacitive reactance of an input port is increased through coupling feed, and the distributed inductive reactance characteristic can be introduced into the short-circuit radiation unit 4.
Preferably, an inductor and/or a capacitor is loaded between lower printed board 1 and upper printed board 2. For example, a capacitor 5 can be applied between the monopole radiating element 7 and the short-circuit radiating element 4, and an inductor 8 can be applied between the short-circuit radiating element 4 and the main ground of the antenna. The capacitance value of the capacitor 5 and the inductance value of the inductor 8 are adjusted, so that the resonant point frequency of the antenna can be changed, the bandwidth is widened, and the antenna can obtain better port matching in a required specific frequency band. The antenna is loaded with lumped parameter elements such as the inductor and the capacitor, the required resonant frequency is obtained by adjusting the inductance value and the capacitance value of the inductor and the capacitor, the resonant frequency is not required to be changed by designing a complicated antenna shape, the shape of the antenna can be simplified, the antenna is easier to process and debug, the cost is controlled, and the mass production and processing are facilitated.
Further preferably, the antenna applied to the mobile terminal provided in the embodiment of the present invention further includes a bent radiation sheet 3. One end of the bent radiating sheet 3 is connected to the short-circuit radiating unit 4, and the other end extends out of the plane of the short-circuit radiating unit 4. The bent radiation sheet 3 increases the radiation area of the antenna and also increases the radiation impedance of the antenna, and the bent radiation sheet 3 extends out of the plane of the short circuit radiation unit 4, for example, the bent radiation sheet can extend upwards along the housing of the mobile terminal device, or extend in other manners.
Fig. 3 is a schematic structural diagram of a monopole radiation element applied to an antenna of a mobile terminal according to an embodiment of the present invention; fig. 4 is a schematic structural diagram of a short-circuit radiation unit applied to an antenna of a mobile terminal according to an embodiment of the present invention; with reference to fig. 3 and 4, the antenna provided by the preferred embodiment of the present invention can cover GSM900/1800/1900/UMTS, LTE700/LTE2300/2500, and WLAN2.4 frequency bands, and the monopole radiating element 7 is used to generate high frequency resonance in the range of 1630 and 2780 MHz; the short circuit radiation unit 4 is used for generating low frequency resonance, the range is 680-1080MHz, and the antenna can cover the requirements of frequency bands of a plurality of mobile communication services while realizing the miniaturization of the antenna.
In a preferred embodiment, the monopole radiating element 7 is in an inverted F shape, and is composed of a first microstrip line, a second microstrip line and a third microstrip line printed on the front surface of the lower printed board 1. The first microstrip line and the second microstrip line are parallel to each other and are respectively vertical to the third microstrip line, the first end of the first microstrip line is connected to the first end of the third microstrip line, and the first end of the second microstrip line is connected to the third microstrip line; the second end of the second microstrip line is electrically connected to the metal feed point.
The short circuit radiation unit 4 is T-shaped and consists of a fourth microstrip line and a fifth microstrip line which are printed on the front surface of the upper-layer printed board; the fourth microstrip line is perpendicular to the fifth microstrip line, and the first end of the fourth microstrip line is connected to the fifth microstrip line.
According to the monopole as an effective quarter-wave radiator, the size of the monopole radiation unit 7 is determined firstly, so that the resonant frequency of the monopole radiation unit 7 is close to 1.8GHz, and then the size of the short-circuit radiation unit 4 is determined, so that the resonant frequency of the short-circuit radiation unit 4 is close to 1 GHz. After the sizes of the monopole radiation unit 7 and the short-circuit radiation unit 4 are determined, the monopole radiation unit 7 and the short-circuit radiation unit 4 are combined together, and the sizes are further optimized and adjusted through modes such as simulation until the required performance indexes are met.
In an embodiment, the dimensions of the monopole radiation unit 7 and the short-circuit radiation unit 4 are as follows: the first microstrip line is 6mm long and 4mm wide; the second microstrip line is 7mm long and 1.5mm wide; the third microstrip line is 30.5mm long and 2.5mm wide; the metal feed point is rectangular, 2mm long and 1.5mm wide. The distance between the first end of the second microstrip line and the second end of the third microstrip line is 19 mm.
The distance between the first end of the fourth microstrip line and the first end of the fifth microstrip line is 7.5mm, and the distance between the first end of the fourth microstrip line and the second end of the fifth microstrip line is 31.5 mm. The length of the fourth microstrip line is 11mm, and the width of the fourth microstrip line is 1 mm; the fifth microstrip line is 40mm long and 3mm wide.
The third microstrip line is parallel to the fifth microstrip line, and the first end of the third microstrip line is aligned with the first end of the fifth microstrip line up and down.
In another preferred embodiment, the second end of the fourth microstrip line is loaded with an inductor and connected to the copper-clad layer on the back of the lower printed board through the first metalized via hole, the first end of the fifth microstrip line is loaded with a capacitor and connected to the first end of the third microstrip line through the second metalized via hole, and the values of the inductor and the capacitor are adjusted in a simulation mode, so that the resonant frequency of the antenna can be changed, the bandwidth can be expanded, and the required frequency band can be obtained. In this embodiment, the inductance of the inductor is 100nH, and the capacitance of the capacitor is 200 pF.
The bent radiation piece is rectangular, the length of the bent radiation piece is 50mm, the width of the bent radiation piece is 6mm, the long edge of the bent radiation piece is connected with the fifth microstrip line, and the wide edge of the bent radiation piece is aligned with the first end of the fifth microstrip line. The bent radiation sheet is perpendicular to the upper printed board and extends upwards to increase the radiation area and the radiation impedance of the antenna and reduce the shielding effect of the antenna main floor. Certainly, the bent radiating fins can also extend out of the plane of the short-circuit radiating unit in a non-vertical mode, for example, an arc mode, and thus the same effect can be achieved, the principle is the same, and further description is omitted.
The lower printed board 1 and the upper printed board 2 are both rectangular glass fiber epoxy resin copper-clad plates, and have the height of 140mm, the width of 70mm, the dielectric constant of 4.4 and the thickness of 0.8 mm. The preferred embodiment provides an antenna clearance of 15mm 50mm and a system clean floor of 125mm 70 mm. The monopole radiation unit 7 and the short-circuit radiation unit 4 are arranged at the upper left corner of the printed board, and two sides of the first end of the fifth microstrip line are respectively aligned with the top edge and the side edge of the upper-layer printed board. The antenna is set according to the distribution of the devices inside the mobile terminal, and is not limited to the above-mentioned position, as long as there is enough headroom and clean floor, and the interference is small.
Fig. 5 is a simulated S11 graph applied to an antenna of a mobile terminal according to a preferred embodiment of the present invention, in which a solid line is a graph of S11 of the antenna loaded with lumped parameter elements, a dotted line is a graph of S11 of the antenna not loaded with lumped parameter elements, and S11 is an input return loss. Simulation results show that the absolute bandwidth of the antenna provided by the preferred embodiment in the low frequency band of about 1GHz is 400M after the lumped parameter element is loaded, and is 2 times of the absolute bandwidth of the antenna when the lumped parameter element is not loaded; after the antenna is loaded with the lumped parameter element, the bandwidth is covered in a high-frequency band from 1630MHz to 2780MHz, and the bandwidth is only covered in 2550MHz to 2650MHz without loading the lumped parameter element.
Fig. 6 is a simulated directional diagram of an antenna applied to a mobile terminal according to a preferred embodiment of the present invention, wherein: fig. 6(a) is a pattern diagram of the x-y plane, fig. 6(b) is a pattern diagram of the y-z plane, and fig. 6(c) is a pattern diagram of the x-z plane. Fig. 6 shows that three frequency points of 0.9GHz, 2.0GHz, and 2.5GHz are selected, and it can be seen from fig. 6 that the antenna provided by the embodiment of the present invention can meet performance requirements at the three frequency points, and has good performance in each direction.
In summary, compared with the prior art, the antenna applied to the mobile terminal provided by the invention has the following beneficial effects:
1. the monopole radiation unit and the short-circuit radiation unit are respectively printed on the upper layer of printed board and the lower layer of printed board, and can generate resonance with different frequencies, so that the antenna can work in multiple frequency bands; the upper layer and the lower layer of the monopole radiation unit and the short circuit radiation unit are overlapped, so that the area occupied by the antenna is reduced, the structure of the antenna can be compact, and the miniaturization of the antenna is realized; the distributed LC matching circuit can be realized by directly exciting the monopole radiation unit on the lower layer and coupling the monopole radiation unit to the short-circuit radiation unit on the upper layer, the capacitive reactance of an input port can be increased by coupling feed, and the short-circuit radiation unit can introduce the distributed inductive reactance characteristic.
2. Lumped parameter elements such as inductors and capacitors are loaded between the upper layer printed board and the lower layer printed board, and the frequency of a resonance point of the antenna can be changed by adjusting the numerical value of the lumped parameter elements, so that the broadband is expanded, and the antenna can obtain better port matching in a required specific frequency band; the resonant frequency is not required to be changed by designing a complex antenna shape, the shape of the antenna is simplified, the antenna is easier to process and debug, and the method is beneficial to controlling the cost and facilitating the batch production and processing.
3. The bent radiation sheet is connected to the short-circuit radiation unit, and the other end of the bent radiation sheet extends out of the plane where the short-circuit radiation unit is located, so that the radiation area of the antenna is increased, the radiation impedance of the antenna is also increased, and the shielding effect of the main floor of the antenna on the radiation body of the antenna is reduced due to the fact that the shielding effect of the main floor of the antenna on the bent radiation sheet is reduced.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. An antenna applied to a mobile terminal is characterized by comprising an upper layer of printed board and a lower layer of printed board;
the front surface of the lower printed board is printed with a monopole radiation unit, and the monopole radiation unit is electrically connected with a metal feed point; the copper-clad part on the back of the lower printed board is used as a part of a radiator of the antenna and is also used as a main floor of the antenna;
the front surface of the upper layer printed board is printed with a short circuit radiation unit, and the short circuit radiation unit is connected to copper clad on the back surface of the lower layer printed board; the monopole radiation unit and the short-circuit radiation unit are overlapped, and the monopole radiation unit and the short-circuit radiation unit generate resonance with different frequencies.
2. The antenna applied to a mobile terminal according to claim 1, wherein an inductor and/or a capacitor is loaded between the upper and lower printed boards.
3. The antenna applied to the mobile terminal of claim 2, wherein the antenna further comprises a bent radiation sheet;
one end of the bent radiation piece is connected to the short-circuit radiation unit, and the other end of the bent radiation piece extends out of the plane where the short-circuit radiation unit is located.
4. The antenna applied to the mobile terminal as claimed in claim 3, wherein the monopole radiating element is used for generating high frequency resonance in the range of 1630 and 2780 MHz; the short circuit radiation unit is used for generating low-frequency resonance in the range of 680-1080 MHz.
5. The antenna applied to a mobile terminal of claim 4,
the monopole radiation unit is in an inverted F shape and consists of a first microstrip line, a second microstrip line and a third microstrip line which are printed on the front surface of the lower printed board; wherein,
the first microstrip line and the second microstrip line are parallel to each other and perpendicular to the third microstrip line respectively, the first end of the first microstrip line is connected to the first end of the third microstrip line, the first end of the second microstrip line is connected to the third microstrip line, the distance between the first end of the second microstrip line and the second end of the third microstrip line is 19mm, and the second end of the second microstrip line is electrically connected to the metal feed point;
the first microstrip line is 6mm long and 4mm wide; the length of the second microstrip line is 7mm, and the width of the second microstrip line is 1.5 mm; the third microstrip line is 30.5mm long and 2.5mm wide; the metal feed point is rectangular, and is 2mm long and 1.5mm wide.
6. The antenna applied to a mobile terminal of claim 5,
the short circuit radiation unit is T-shaped and consists of a fourth microstrip line and a fifth microstrip line which are printed on the front surface of the upper-layer printed board; wherein,
the fourth microstrip line is perpendicular to the fifth microstrip line, the first end of the fourth microstrip line is connected to the fifth microstrip line, the distance between the first end of the fourth microstrip line and the first end of the fifth microstrip line is 7.5mm, and the distance between the second end of the fourth microstrip line and the second end of the fifth microstrip line is 31.5 mm;
the length of the fourth microstrip line is 11mm, and the width of the fourth microstrip line is 1 mm; the length of the fifth microstrip line is 40mm, and the width of the fifth microstrip line is 3 mm.
7. The antenna applied to a mobile terminal according to claim 6,
the second end of the fourth microstrip line is loaded with an inductor and is connected to the copper-clad layer on the back of the lower printed board through a first metalized through hole; the size of the inductor is 100 nH;
a first end of the fifth microstrip line is loaded with a capacitor and is connected to a first end of the third microstrip line through a second metalized via hole; the capacitance is 200pF in size.
8. The antenna applied to a mobile terminal according to claim 6,
the bent radiation sheet is rectangular, and has the length of 50mm and the width of 6 mm;
the long edge of the bent radiation piece is connected with the fifth microstrip line, and the wide edge of the bent radiation piece is aligned with the first end of the fifth microstrip line;
the bent radiation sheet is perpendicular to the upper-layer printed board.
9. The antenna applied to a mobile terminal of claim 7 or 8,
the third microstrip line is parallel to the fifth microstrip line, and the first end of the third microstrip line is aligned with the first end of the fifth microstrip line up and down.
10. The antenna applied to a mobile terminal of claim 9,
the upper and lower layers of printed boards are rectangular glass fiber epoxy resin copper-clad plates, the height is 140mm, the width is 70mm, the dielectric constant is 4.4, and the thickness is 0.8 mm;
the clearance occupied by the antenna is 15mm by 50mm, and the size of a system clean floor is 125mm by 70 mm;
and two sides of the first end of the fifth microstrip line are respectively aligned with the top edge and the side edge of the upper-layer printed board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610402839.7A CN106058434B (en) | 2016-06-07 | 2016-06-07 | A kind of antenna applied to mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610402839.7A CN106058434B (en) | 2016-06-07 | 2016-06-07 | A kind of antenna applied to mobile terminal |
Publications (2)
| Publication Number | Publication Date |
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| CN106058434A CN106058434A (en) | 2016-10-26 |
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| CN106602243B (en) * | 2016-12-02 | 2019-10-25 | 西安电子科技大学 | 2MIMO antenna for mobile phone and its design method based on the feature theory of modules |
| CN110943286A (en) * | 2019-09-29 | 2020-03-31 | 歌尔股份有限公司 | Mobile terminal and antenna thereof |
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| CN106058434A (en) | 2016-10-26 |
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