CN108539420B - Eight-frequency-band tablet computer antenna with metal narrow frame - Google Patents

Eight-frequency-band tablet computer antenna with metal narrow frame Download PDF

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Publication number
CN108539420B
CN108539420B CN201810465580.XA CN201810465580A CN108539420B CN 108539420 B CN108539420 B CN 108539420B CN 201810465580 A CN201810465580 A CN 201810465580A CN 108539420 B CN108539420 B CN 108539420B
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metal
antenna
frame
gap
patch
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CN108539420A (en
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张立
陈楚晖
翁子彬
焦永昌
沈东麟
陈官韬
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Xidian University
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Xidian University
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna

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Abstract

The invention discloses an eight-frequency-band tablet computer antenna with a metal narrow frame, which is used for solving the problem that the tablet computer antenna cannot cover eight frequency bands under the surrounding of the metal narrow frame in the prior art. The invention comprises the following steps: the device comprises a dielectric material plate 1, a metal floor 2 with a notch, a radiation unit 3 and a metal frame 4; wherein take metal floor 2 and the radiation unit 3 printing of breach in the front of dielectric material board 1, the breach on the metal floor 2 is located its top edge intermediate position, and the position of radiation unit 3 corresponds with the breach position, and dielectric material board 1 periphery is surrounded has the metal frame 4 that sets up breakpoint gap 7, and has clearance 6 between metal frame 4 and the dielectric material board 1, and metal frame 4 links to each other with metal floor 2 through two short circuit connection spare 8. The antenna has a small clearance area, can completely cover eight working frequency bands, effectively widens the bandwidth of the antenna, and meets the application requirement of a metal narrow-frame tablet personal computer by the actual measurement efficiency of the antenna.

Description

Eight-frequency-band tablet computer antenna with metal narrow frame
Technical Field
The invention belongs to the technical field of communication, and further relates to a terminal antenna, in particular to an eight-frequency-band tablet computer antenna with a metal narrow frame, which can be used for receiving/transmitting 2G/3G/4G signals by a tablet computer with a metal frame.
Background
In recent years, wireless communication technology has been rapidly developed, and mobile communication terminals have gradually evolved into a bridge between people and the internet. Among them, the tablet personal computer has become a necessity for daily life of people. Because the metal frame can not only increase the mechanical stability of the device, but also improve the use comfort of the user, the tablet computer with the metal frame is becoming the mainstream trend of the current market. However, due to the existence of the metal frame, the conventional mobile terminal antenna and the metal frame tend to have strong coupling, thereby directly affecting the radiation performance of the antenna, and making it unable to completely cover the eight operating bands of LTE700/2300/2500/GSM850/900/DCS/PCS/UMTS 2100.
In addition, in order to further add to the high-quality sense of the device, one often pursues ultra-thinning of the device and a larger screen occupation, which undoubtedly further compresses the space occupied by the antenna. Therefore, how to design a low-profile, multi-band, narrow-bezel tablet antenna surrounded by a metal bezel is a great challenge.
At present, in order to solve the problem of deterioration of the performance of the terminal antenna caused by the metal frame, popular design schemes are in the forms of Loop, Slot, Monopole and the like. For example, in patent application document with patent publication No. CN 107394351 a, entitled "an all-metal-casing mobile intelligent terminal antenna", a terminal antenna is provided, which is obtained by disposing a narrow slot on a metal frame, dividing the metal frame into two independent parts, and using one of the metal frames as a part of a loop antenna, so as to finally achieve coverage of seven operating bands of GSM850/900/DCS/PCS/UMTS2100/LTE2300/2500, however, the design has a large requirement for headroom, and cannot achieve the requirement for narrow frame, and the low frequency does not cover the LTE700 band with wide application prospect. In patent application document No. CN 107104284 a entitled "full metal ring narrow frame 4G smart machine antenna", there is provided a full metal ring narrow frame 4G smart machine antenna, in which the design of the antenna maintains a complete metal frame, but it still fails to cover the LTE700 frequency band, and two lumped elements are loaded, which are known to cause unnecessary loss to the antenna efficiency. In summary, the existing technical solutions all have certain defects, and cannot solve the problem of covering eight frequency bands under the surrounding of a metal narrow frame.
Disclosure of Invention
The invention aims to provide an eight-frequency-band tablet computer antenna with a metal narrow frame aiming at the defects of the prior art so as to solve the technical problem that eight working frequency bands are covered under the surrounding of the metal narrow frame. According to the invention, the break-point gap and the metal grounding plate are arranged, the antenna clearance area and the metal frame are integrated into a T-shaped gap, the T-shaped gap is excited by the antenna radiation unit to generate gap resonance to participate in radiation, the bandwidth of the antenna is effectively widened, the resonance size pressure required by the antenna unit is shared, and the size of the antenna is greatly reduced; meanwhile, the antenna radiation unit can generate resonance characteristics, and finally, the eight-band bandwidth coverage is realized on the premise of not loading any lumped elements.
In order to achieve the purpose, the invention adopts the technical scheme that:
an eight-frequency-band tablet personal computer antenna with a metal narrow frame comprises a dielectric material plate 1, a metal floor 2, a radiation unit 3 and a metal frame 4; wherein metal floor 2's top edge intermediate position is equipped with breach 201, and radiating element 3 is located breach 201 department, and metal floor 2 and radiating element 3 are printed in medium material board 1's front, and metal frame 4 encircles at medium material board 1 periphery, and is equipped with clearance 6, its characterized in that between the two:
the top of the metal frame 4 is provided with a breakpoint gap 7, and the metal frame 4 is connected with the metal floor 2 through a short circuit connecting piece 8.
In the antenna, the breakpoint gap 7 is arranged on the top frame of the metal frame 4, and the left edge of the breakpoint gap 7 is 115-125 mm away from the left boundary of the top frame where the breakpoint gap is located; the width of the breakpoint gap 7 is 2-3 mm.
In the antenna, the metal frame 4 is directly connected with the metal floor 2 through two short-circuit connectors 8, one of the short-circuit connectors is arranged on the metal floor 2 close to the left edge of the notch 201, and the other short-circuit connector is arranged on the metal floor 2 close to the right edge of the notch 201; the short circuit connecting piece 8 is a metal grounding piece.
In the antenna, the width of the gap 6 between the dielectric material plate 1 and the metal frame 4 is 1-3 mm.
The antenna, wherein the notch 201 is rectangular, and has a length of 74mm and a width of 5 mm.
The antenna, wherein the radiating element 3 is composed of an "L" type radiating patch 301, a rectangular radiating patch 302, an "L" type coupling ground patch 303, a feeding point 5 and a ground point 9, wherein the short arm of the "L" type radiating patch 301 is directly connected to the rectangular radiating patch 302, and the long arm of the "L" type coupling ground patch 303 is partially coupled to the long arm of the "L" type radiating patch 301;
the antenna, wherein the lower edge of the short arm of the "L" shaped radiating patch 301 is connected to the feeding point 5;
the antenna, wherein the lower edge of the short arm of the "L" shaped coupling ground patch 303 is connected to the metal floor 2 through the ground point 9.
Compared with the prior art, the invention has the following advantages:
firstly, the method comprises the following steps: because the invention integrates the antenna clearance area and the metal frame into a T-shaped gap by arranging the breakpoint gap and the metal grounding sheet, the T-shaped gap is excited by the antenna radiation unit to generate gap resonance to participate in radiation, the bandwidth of the antenna is effectively widened, and the resonance size pressure required by the antenna unit is shared, thereby greatly reducing the size of the antenna;
secondly, the method comprises the following steps: the antenna clearance area has very small width, meets the design requirement of the current tablet computer, can completely cover eight working frequency bands, and meets the application requirements of the tablet computer antenna with low profile, multiple frequency bands and narrow frame;
thirdly, the method comprises the following steps: because no lumped element is added in the invention, unnecessary energy loss caused by loading the lumped element and errors caused by the lumped element in batch production are avoided, eight-frequency-band bandwidth coverage is realized on the premise of not loading the lumped element, and the actual measurement efficiency is higher, so that the eight-frequency-band bandwidth coverage has obvious advantages in practical application.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is S of the present invention11Comparing the simulation result with the actual measurement result;
FIG. 4 is a graph of measured efficiency of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the specific structure of the present invention is as follows:
the eight-frequency-band tablet personal computer antenna with the narrow metal frame comprises a dielectric material plate 1, a metal floor 2, a radiation unit 3 and a metal frame 4; wherein the top edge intermediate position of metal floor 2 is equipped with breach 201, and radiation unit 3 is located breach 201 department, and metal floor 2 and radiation unit 3 print in the front of medium material board 1, and metal frame 4 encircles in medium material board 1 periphery, and is equipped with clearance 6 between the two.
The dielectric material plate 1 is a rectangular dielectric plate with a relative dielectric constant of 4.4, and is 150mm in length, 200mm in width and 0.8mm in thickness.
The metal floor 2 is a metal patch with a notch, and is printed on the front surface of the rectangular dielectric material plate 1, and the metal patch is 150mm long and 200mm wide; the notch is rectangular and is located in the middle of the top edge of the metal floor 2, the length of the notch is 74mm, the width of the notch is 5mm, and the left edge of the notch is 63mm away from the left edge of the metal floor 2.
The metal frame 4 surrounds the rectangular medium material plate 1 for a circle and is made of copper sheets with the thickness of 0.5mm and the height of 5 mm; a gap 6 is formed between the metal frame 4 and the rectangular dielectric material plate 1, and the width of the gap is 2 mm; a breakpoint gap 7 is arranged at the edge position of the top of the metal frame 4, the width of the gap is 2.5mm, and the distance between the left edge of the gap and the left edge of the top frame of the metal frame 4 is 120.5 mm; the metal frame 4 is directly connected with the metal floor 2 through two short circuit connecting pieces 8, the two short circuit connecting pieces 8 are welded with the metal frame 4 and the metal floor 2, the short circuit connecting pieces are metal grounding pieces, the short circuit connecting pieces are arranged to integrate the metal frame 4 and the metal floor 2 into a whole, a T-shaped open circuit gap is formed by combining the gap 6, the long arm and the short arm of the T-shaped open circuit gap are excited to generate 1/4-wavelength basic resonance characteristics respectively and are used for covering LTE700 and UMTS2100 frequency bands, the bandwidth of the antenna is effectively widened, the resonance size pressure required by the antenna unit is shared, and the miniaturization of the antenna is realized.
Referring to fig. 2, the radiating element 3 of the eight-band tablet computer antenna with a narrow metal frame is printed on the front surface of the rectangular dielectric material plate 1, and the position of the radiating element corresponds to the position of the gap of the metal floor, and includes an "L" type radiating patch 301, a rectangular radiating patch 302, an "L" type coupling ground patch 303, a feeding point 5, and a ground point 9.
The length of the longitudinal arm of the L-shaped radiation patch 301 is 4mm, the width of the L-shaped radiation patch is 1mm, the length of the transverse arm of the L-shaped radiation patch 301 is 49mm, the width of the transverse arm of the L-shaped radiation patch is 0.6mm, and the upper edge of the longitudinal arm of the L-shaped radiation patch is superposed with the upper edge of the dielectric slab 1; the short arm of the "L" shaped radiating patch 301 is directly connected to the rectangular radiating patch 302.
The rectangular radiation patch 302 has a length of 18mm and a width of 0.8mm, and a longitudinal distance between an upper edge of the rectangular radiation patch and an upper edge of the dielectric plate 1 is 2.2 mm.
The transverse arm length of the L-shaped coupling grounding patch 303 is 34mm, the width of the L-shaped coupling grounding patch is 0.9mm, the longitudinal arm length of the L-shaped coupling grounding patch is 2.8mm, the width of the L-shaped coupling grounding patch is 0.5mm, and the longitudinal distance between the upper edge of the transverse arm and the lower edge of the transverse arm of the L-shaped radiation patch 301 is 0.7 mm; the long arm of the "L" shaped coupling ground patch 303 is coupled to the long arm portion of the "L" shaped radiating patch 301.
The feeding point 5 is located at the lower edge of the short arm of the "L" shaped radiating patch 301 and directly feeds the radiating patches 301 and 302. The L-shaped radiating patch 301 is fed to generate 1/4-wavelength basic resonance to cover the DCS/PCS frequency band, and the rectangular radiating patch 302 is fed to generate 1/4-wavelength basic resonance to cover the LTE2300/2500 frequency band.
The grounding point 9 is positioned at the lower edge of the short arm of the L-shaped coupling grounding patch 303, and the effect of the grounding point is to connect the coupling patch with the metal floor 2 to form a coupling grounding structure to generate resonance for covering the GSM850/900 frequency band.
The application effect of the present invention is further explained by combining the following simulation and actual measurement:
firstly, simulation and actual measurement conditions:
(1) the S in the above embodiment was simulated using the commercial simulation software HFSS _15.0 and the vector network analyzer MS46322A11The simulation and actual measurement were performed, and the comparison result between the simulation and the actual measurement is shown in fig. 3.
(2) The efficiency of the above embodiment was measured in a microwave darkroom, and the measured efficiency results in the operating frequency bands (698MHz to 960MHz and 1710MHz to 2690MHz) are shown in FIG. 4.
Secondly, simulation and actual measurement results:
referring to FIG. 3, in S11Less than or equal to-6 dB is taken as a standard, the impedance bandwidth of the antenna simulation result in the embodiment is 689 MHz-970 MHz and 1570 MHz-2960 MHz, and the impedance bandwidth of the antenna actual measurement result in the embodiment is 675 MHz-1070 MHz and 1458 MHz-2932 MHz.
Referring to fig. 4, in the embodiment, the measured efficiency of the antenna is 51% -84% in the low frequency range of 698 MHz-960 MHz, and 52% -87% in the high frequency range of 1710 MHz-2690 MHz.
By combining the simulation and test results, the invention can effectively widen the bandwidth of the antenna, and can realize the coverage of eight-frequency band bandwidth under the metal narrow frame surrounding without loading any lumped elements.
The invention has not been described in detail in part of the common general knowledge of those skilled in the art.
The above description and examples are only preferred embodiments of the present invention and should not be construed as limiting the present invention, it will be obvious to those skilled in the art that various modifications and changes in form and detail may be made based on the principle and construction of the present invention after understanding the content and design principle of the present invention, but such modifications and changes based on the inventive concept are still within the scope of the appended claims.

Claims (9)

1. An eight-frequency-band tablet personal computer antenna with a metal narrow frame comprises a dielectric material plate (1), a metal floor (2), a radiation unit (3) and a metal frame (4); wherein the top edge intermediate position on metal floor (2) is equipped with breach (201), and radiant element (3) are located breach (201) department, and metal floor (2) and radiant element (3) are printed in the front of dielectric material board (1), and metal frame (4) encircle in dielectric material board (1) periphery, and are equipped with clearance (6), its characterized in that between the two: the top of the metal frame (4) is provided with a breakpoint gap (7), and the metal frame (4) is connected with the metal floor (2) through a short-circuit connecting piece (8);
the number of the short circuit connecting pieces (8) is two, one of the short circuit connecting pieces is arranged at a position close to the left edge of the notch (201) on the metal floor (2), and the other short circuit connecting piece is arranged at a position close to the right edge of the notch (201) on the metal floor (2);
the break point gap (7) is combined with the gap (6) to form a T-shaped open-circuit gap.
2. The antenna of claim 1, wherein: the breakpoint gap (7) is arranged on the top frame of the metal frame (4), and the left edge of the breakpoint gap (7) is 115-125 mm away from the left boundary of the top frame where the breakpoint gap is located.
3. The antenna of claim 2, wherein: the width of the breakpoint gap (7) is 2-3 mm.
4. The antenna of claim 1, wherein: the short circuit connecting piece (8) is a metal grounding sheet.
5. The antenna of claim 1, wherein: the width of a gap (6) between the dielectric material plate (1) and the metal frame (4) is 1-3 mm.
6. The antenna of claim 1, wherein: the notch (201) is rectangular, and the length and the width of the notch are 74mm and 5mm respectively.
7. The antenna of claim 1, wherein: the radiating unit (3) is composed of an L-shaped radiating patch (301), a rectangular radiating patch (302), an L-shaped coupling grounding patch (303), a feeding point (5) and a grounding point (9), wherein the short arm of the L-shaped radiating patch (301) is directly connected with the rectangular radiating patch (302), and the long arm of the L-shaped coupling grounding patch (303) is partially coupled with the long arm of the L-shaped radiating patch (301).
8. The antenna of claim 7, wherein: the lower edge of the short arm of the L-shaped radiating patch (301) is connected with a feed point (5).
9. The antenna of claim 7, wherein: the lower edge of the short arm of the L-shaped coupling grounding patch (303) is connected with the metal floor (2) through a grounding point (9).
CN201810465580.XA 2018-05-16 2018-05-16 Eight-frequency-band tablet computer antenna with metal narrow frame Active CN108539420B (en)

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CN110970710B (en) * 2018-09-29 2022-08-12 荷兰移动驱动器公司 Antenna structure and wireless communication device with same
CN113745831B (en) * 2020-05-27 2022-08-26 华为技术有限公司 Antenna structure and mobile terminal

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