CN107369892B - A kind of multifrequency terminal antenna for full metal jacket - Google Patents

A kind of multifrequency terminal antenna for full metal jacket Download PDF

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Publication number
CN107369892B
CN107369892B CN201710778208.XA CN201710778208A CN107369892B CN 107369892 B CN107369892 B CN 107369892B CN 201710778208 A CN201710778208 A CN 201710778208A CN 107369892 B CN107369892 B CN 107369892B
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gap
metal
antenna
circuit board
terminal antenna
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CN107369892A (en
Inventor
杨鹏
严魁锡
王磊
汪希萌
杨峰
曾莉尧
曹厚华
丁柏浪
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University of Electronic Science and Technology of China
Guangdong Electronic Information Engineering Research Institute of UESTC
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University of Electronic Science and Technology of China
Guangdong Electronic Information Engineering Research Institute of UESTC
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    • 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
    • H01Q13/106—Microstrip slot 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
    • 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
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • 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

Abstract

The present invention provides a kind of multifrequency terminal antenna for full metal jacket, belongs to antenna technical field.Inventive antenna includes the metal shell for being installed in circuit system back, is arranged in the positive feeding network of system circuit board and gap；The metal shell is located at circuit system back and offers dual-end type gap and single-ended open-type gap respectively thereon, and the feed branch to match in feeding network with feed port across above-mentioned two gap, motivates gap to form multiple frequency point resonance respectively.The present invention further loads on the improvement in dual-end type gap by U-shaped folded metal piece, forms the three-dimensional structure for being different from existing two-dimensional aperture antenna to cover more multiband；The present invention is realizing multiband and wide band while also solving the problems, such as that the metal shell of antenna and large area coexists causes antenna performance impaired, improves the intensity, texture and aesthetic feeling of terminal device.

Description

A kind of multifrequency terminal antenna for full metal jacket
Technical field
The invention belongs to antenna technical field, in particular to a kind of multifrequency terminal antenna for full metal jacket.
Background technique
With the arriving of information age, mobile communication has obtained unprecedented development.Antenna is as one wirelessly communicated A important component decides the electric property of terminal device communication with the outside world, and generally, a secondary good antenna should be effective The overall performance of terminal device is significantly improved while reducing space occupied by antenna, and increases the signal of terminal device acquisition The rate of intensity and data communication.Against the development of mobile communications network, the 4G communication network of high speed data transfer is supported at present In with all strength universal, and for the upgrade version as 4G communication network --- the research of 5G communication network is also like a raging fire to open Exhibition, therefore the 4G/5G/WLAN communication network for integrating 4G, 5G and WLAN is the development trend of future wireless system, this will It asks terminal device to meet all frequency ranges of WLAN, 4G and 5G communication network, also as backward compatible as possible still to exist at the same time The frequency range of the 3G communication network used.And so wide frequency range coverage area is one for the design of terminal device antenna Very big problem.In addition, with the development of technology, metal shell gradually appears in telecom terminal product.Metal shell is very The structural strength of communication terminal device can be enhanced in big degree and can satisfy demand of the consumer to aesthetic feeling and sense of touch.But Be, external antenna of the antenna of communication terminal device since most to built-in antenna again to full metal jacket antenna, product it is outer Shape is further beautiful, but the area for leaving aerial radiation for is smaller and smaller.Therefore, metal shell has often seriously affected terminal antenna Radiance, and the component part that antenna is important as communication system, the quality of performance directly influence terminal device The superiority and inferiority of performance.So how to solve the problems, such as the metal shell of antenna and large area coexist all be all the time this field urgently The difficult point that need to be captured.
Summary of the invention
Technical problem to be solved by the present invention lies in: a kind of end covering 5G, 4G and WLAN communication network frequency band is provided Antenna is held, while also solving the problems, such as that the metal shell of antenna and large area coexists.
In order to solve the above technical problem, the present invention provides following technical solutions:
Technical solution one；
A kind of multifrequency antenna for full metal jacket, the metal shell including being installed in circuit system back, opens up In the gap on metal shell and it is arranged in the positive feeding network of system circuit board；It is characterized by:
The edge of the metal shell is equipped with the metal edge frame that side is extended to from the back side of system circuit board；Institute It states and offers the first gap and the second gap on metal shell, first gap is dual-end type gap, second seam Gap is single-ended open-type gap；Metal edge frame is divided into mutually independent three sections by first gap and the second gap；
The feeding network includes: feed branch, match circuit and feed port；Feed port and corresponding feed branch it Between be connected with match circuit, feed branch is respectively across the first gap and the second gap for being located at circuit system back.
Technical solution two；
A kind of multifrequency intelligent terminal antenna for full metal jacket, including being installed in outside the metal of circuit system back Shell, the gap being opened on metal shell and setting are in the positive feeding network of system circuit board；It is characterized by:
The edge of the metal shell is equipped with the metal edge frame that side is extended to from the back side of system circuit board；Institute It states and offers the first gap and the second gap on metal shell, first gap is dual-end type gap, second seam Gap is single-ended open-type gap, and metal edge frame is divided into mutually independent three sections by first gap and the second gap；
The feeding network includes: feed branch, match circuit, feed port and gating circuit；Feed port and feed It is connected with gating circuit between branch, match circuit, feed branch difference are connected between each feed branch and gating circuit Across the first gap and the second gap for being located at circuit system back.
According to embodiments of the present invention, gating circuit includes: gating switch, comparison control circuit and detection electricity in the present invention Road.
Technical solution on the basis of technical solution one second is that incorporate the function of antenna frequencies reconstruct, after realizing intelligent decision Select the different operating frequency range of antenna.
Further, the metal edge frame includes two long sides and two being oppositely arranged in both the above technical solution Short side, two second short sides are oppositely arranged and are connected between two long sides；First gap and the second gap are leaned on The short side setting of nearly metal edge frame.
Further, the system circuit board is that medium substrate or single side cover copper in both the above technical solution Medium substrate.
Further, the width in gap is between 0.5 millimeter~5 millimeters on the metal shell.
Further, the distance of its short side of clearance distance is adjustable on the metal shell in both the above technical solution.
Further, in both the above technical solution, the opening width in gap and the of same size of gap or different, The opening width in the gap is between 0.5 millimeter~5 millimeters.
Further, in both the above technical solution, further include load on be separated to form on the first gap it is single-ended The U-shaped folded metal piece 300 in open-type gap.
Further, the U-shaped folded metal piece and the mutually isolated setting of system circuit board.
According to embodiments of the present invention, U-shaped folded metal piece part is suspended at system circuit board upper front, U in the present invention The both ends of type folded metal piece are connected down through in system circuit board and with its back metal shell, so that U-shaped folding is golden Belong to piece and the first gap is separated to form single-ended open-type gap.
Wherein: the length in the single-ended open-type gap that the first gap and load U-shaped folded metal piece thereon are formed and Width is adjustable.
As a specific embodiment of the invention, the U-shaped folded metal piece in the part for the setting that suspends and system below Nonmetallic materials also can be filled therebetween in circuit board.
Further, the metal shell is as systematically in both the above technical solution.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention forms the machine of resonance by loading dual-end type gap, dual-end type gap on metal shell Reason is similar with the existing single-ended open-type gap formation mechanism of resonance, however since dual-end type gap is different from existing list End opening type gap enables to feed placement to be formed about the working condition of near short circuit, is equivalent to same feeding point excitation Two single-ended open-type gaps；And different imaginary short positions correspond to different frequency so that dual-end type gap formed it is more A frequency point resonance, to realize that multiband works, according to embodiments of the present invention as a result, being capable of covering part by reasonably adjusting parameter Divide 4G frequency range and 5G frequency range.
2, the present invention is using metal shell as systematically, and as radiating element, the present invention adopts in the gap on metal shell It is different from conventional planar antenna structure with three-dimensional structure modeling, solves antenna while realizing antenna miniaturization and compactedness The problem for causing antenna performance impaired coexists with the metal shell of large area.
3, antenna of the invention is suitable for full metal jacket terminal device, with the terminal device of inventive antenna in addition to gold Belonging to except two gaps of rear cover and two open seams on metal edge frame, the back side and side of terminal device are metal, The intensity, texture and aesthetic feeling for improving terminal device, cater to the market demand.
Detailed description of the invention
Fig. 1 is a kind of 3 D stereo signal of multifrequency terminal antenna for full metal jacket provided in an embodiment of the present invention Figure；
Fig. 2 is a kind of schematic side view of multifrequency terminal antenna for full metal jacket provided in an embodiment of the present invention；
Fig. 3 is a kind of schematic top plan view of multifrequency terminal antenna for full metal jacket provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of metal back cover in multifrequency terminal antenna provided in an embodiment of the present invention；
Fig. 5 is the knot for being located at the positive feeding network of system circuit board in multifrequency terminal antenna provided in an embodiment of the present invention Structure schematic diagram；
Fig. 6 is the U-shaped folded metal piece loaded on the first gap in multifrequency terminal antenna provided in an embodiment of the present invention With the schematic diagram of system circuit board；
Fig. 7 is the schematic diagram of match circuit in multifrequency terminal antenna provided in an embodiment of the present invention；
Fig. 8 is the schematic diagram of gating circuit in multifrequency terminal antenna provided in an embodiment of the present invention；
Fig. 9 is the work block diagram of gating circuit in multifrequency terminal antenna provided in an embodiment of the present invention；
Figure 10 is reflection coefficient curve of the multifrequency terminal antenna provided in an embodiment of the present invention under two working conditions；
Figure 11 is efficiency curve of the multifrequency terminal antenna provided in an embodiment of the present invention under two working conditions.
In figure: 100 be metal shell, and 101 be metal back cover, and 102 be metal edge frame, and 200 be gap, and 201 be the first seam Gap, 202 be the second gap, and 300 be U-shaped folded metal piece, and 400 be feed port, and 500 be gating circuit, and 601 be feed branch One, 602 be feed branch two, and 701 be match circuit one, and 702 be match circuit two, and 800 be system circuit board, and 900 be feed Network.
Specific embodiment
The gist of the invention is to provide a kind of antenna form loaded using dual-end type gap, passes through slot antenna Multiple frequency point resonance are formed, to realize that multiband works, can be used in the mobile terminal of the following 5G communication network；This hair simultaneously It is bright to be designed using full metal jacket, shielding action of the conventional metals shell to antenna is eliminated, antenna performance is excellent, realizes suitable Antenna assembly for full metal jacket terminal device.
The principle of the present invention and characteristic are described in detail with Figure of description combined with specific embodiments below:
Embodiment:
Terminal device includes but is not limited in the present invention: mobile phone terminal, smartwatch, portable computer or similar Any suitable terminal device.
In conjunction with Fig. 1 to schematic diagram illustrated in fig. 6, the specific embodiment of the invention provides a kind of for full metal jacket Multifrequency smart antenna, the metal shell 100 including being installed in 800 back side of system circuit board, the seam being opened on metal shell 100 Gap 200 and setting are in the positive feeding network 900 of system circuit board 800；It is characterized by:
The edge of the metal shell 100 is equipped with the metal that side is extended to from the back side of system circuit board 800 Frame 102；The first gap 201 and the second gap 202 are offered on the metal shell, first gap 201 is opened for both-end Shape of the mouth as one speaks gap, second gap 202 are single-ended open-type gap, first gap 201 and the second gap 202 by metal edges Frame is divided into mutually independent three sections；
The feeding network 900 includes: feed branch 1, feed branch 2 602, match circuit 1, matching electricity Road 2 702, feed port 400 and gating circuit；Gating circuit, each feed point are connected between feed port and feed branch Match circuit is connected between branch and gating circuit, feed branch is respectively across the first gap for being located at circuit system back 201 and second gap 202.
As shown in figure 4, metal shell 100 includes the metal edge frame 102 of metal back cover 101 and metal back cover side, gold Belong to rear cover 101 and metal edge frame 102 is connected to form the monolithic case of terminal device；3 dimensional drawing as shown in connection with fig. 1 can be with Find out: in metal back cover and being respectively arranged with interconnected the first gap 201 and the second gap 202 on metal edge frame；The One gap 201 includes two gap bands being provided on metal edge frame 102 and a narrow slit being provided with metal back cover 101, and two A gap band is located at narrow slit whole story both ends and is connected to form dual-end type gap with above-mentioned narrow slit respectively, in which: gap band Width is of same size or different from narrow slit, and the width of the gap band and narrow slit is between 0.5 millimeter~5 millimeters；The Two gaps 202 include a gap band being provided on metal edge frame 102 and another narrow slit for being provided with metal back cover 101, One gap band is located at above-mentioned narrow slit one end and is connected to form single-ended open-type gap with narrow slit respectively, in which: the width of gap band Degree is of same size or different from narrow slit, and the width of the gap band and narrow slit is between 0.5 millimeter~5 millimeters.It is described Metal shell is separated discontinuous region by gap 200, to avoid metal shell 100 using gap radiation and believe antenna Number adverse effect, and then improve antenna performance
Further, the first gap 201 and the second gap 202 can use the mode of filling non-metallic material with guarantee fund Belong to the intensity of shell.
Further, the size in the first gap 201 and the second gap 202 can be set as the case may be, not made herein Limitation, the width of preferably two narrow slits 201,202 of this implementation are 3mm.
Fig. 5 shows the system circuit board 800 and its front feeding network 900 of full metal jacket mobile intelligent terminal antenna Schematic top plan view；In conjunction with Fig. 1 it is found that including: feed port 400 in the positive feeding network 900 of system circuit board 800, choosing Circuit passband 500, feed branch 1, feed branch 2 602, match circuit 1 and match circuit 2 702；
Wherein: feed branch 1 is specifically the L-type microstrip line using open-end as feed element, to motivate First gap 201, and connect by match circuit 1 with the gating circuit 500 being set on system circuit board 800；Feed point Branch 2 602 is also the L-type microstrip line using open-end as feed element, to motivate the second gap 202, and passes through matching Circuit 2 702 is connect with the gating circuit 500 being set on system circuit board 800；Feed port 400 passes through one section of microstrip line and choosing Circuit passband 500 is connected, thus, radiofrequency signal selects feed-in feed branch from the gated circuit 500 of feeding point 400；And it is chosen The feed branch selected then passes through the resonance in the corresponding gap of coupling excitation, in practical work process, metal back cover 101 and and its The metal edge frame 102 of connection is collectively as systematically.
In order to cover more 4G frequency ranges, preferably, this gives one kind to load on The structural schematic diagram of U-shaped folded metal piece 300 on one gap 201 shows U-shaped folded metal piece 300 and system electricity in Fig. 5 The positional relationship of road plate.As shown in Figure 5, the horizontal plane of U-shaped folded metal piece 300 is and the mutually isolated setting of system circuit board , nonmetallic materials can be filled therebetween, and the both ends folded in U-shaped folded metal piece 300 are down through system circuit board It is connected in 800 and with its back metal shell (i.e. metal back cover 101), so that 201 shape of U-shaped folded metal piece and the first gap At the gap of a single-ended opening.U-shaped folded metal piece 300 is made to combine to form new resonance with the first gap 201 in this way Path, to realize the resonance of low frequency, the position of U-shaped folded metal piece 300 and size can according to different user frequency range into Row adjustment, and then realize the demand of multiband communication.
Specifically, as shown in fig. 7, this example gives the form of the match circuit for adjusting antenna impedance bandwidth, It is shown with such as Fig. 7 (a) of circuit 1, use C1 for series capacitance, L1 is shunt inductance；Such as Fig. 7 (b) institute of match circuit 2 702 Show, using the form of shunt capacitance C2 and series inductance L2；
Specifically, this example gives the gating circuit between connection feed port 400 and match circuit 701,702 500 schematic diagram, as shown in figure 8, as shown in Fig. 8 (a), right end feed branch 2 602 is opened when switch selects left side to connect Road, one 601 pairs of gaps of the matched circuit 1 of radiofrequency signal and feed branch load the first seam of U-shaped folded metal piece 300 Gap 201 is fed, and Antenna Operation is in state 1；When switch selects right side to connect, as shown in Fig. 8 (b), left side feed branch 1 Open circuit, 2 602 pair of second gap 202 of the matched circuit 2 702 of radiofrequency signal and feed branch are fed, and Antenna Operation is in state 2。
Specifically, this gives on system circuit board 800 and to connect feed port by as shown in Figure 9 The work block diagram of gating circuit 500 between 400 and match circuit 701,702；Gating circuit 500 includes: gating switch, detection Circuit and comparison control circuit；Gating switch connects one of feed branch in advance, and signal is examined as reference all the way using this To two-way working signal real-time monitoring, Testing index can be detection amplitude and is also possible to phase slowdown monitoring circuit, then present two Signal in electric branch is compared, and comparison control circuit realizes the function of comparing with control, if other signal all the way is than ginseng It is weak to examine signal, then switchs and does not make a response, keeps original state；If compared in addition, signal is stronger than reference signal all the way, So switch makes handoff response, and using state at this time as reference signal next time.It is realized by this technological means The frequency reconfiguration of antenna, i.e., real-time perfoming frequency range switches according to actual needs, the different operating frequency range of intelligent selection antenna.
The advantages of multifrequency terminal antenna provided by the invention realizes multifrequency and wideband, frequency needed for communication can be covered Section.The structural parameters of antenna, l in this implementation are indicated in conjunction with Fig. 3, Fig. 5, Fig. 6 and Fig. 71=43mm, w1=w2=3mm, l2= 23mm, l3=18mm, h=6mm, p1=28mm, p2=16.5mm, C1=2.2pF, L1=5.1nH, C2=0.75pF, L2= 2.7nH；As shown in Figure 10, the present embodiment provides the return loss plot based on above structure parameter antenna；As shown in figure 11, originally Embodiment provides the efficiency curve based on above structure parameter antenna；It can be seen that the present invention is based on both-ends to open from above-mentioned figure Shape of the mouth as one speaks gap loads the trailing edge slot antenna structure that U-shaped folded metal piece is formed, effective while realizing the miniaturization of antenna Cover this four 4G communications bands of GSM850, GSM900, LTE2300 and LTE2500, the WLAN frequency range of 5.8GHz and future Account for two leading 5G communications bands；Further single-ended open-type slot antenna cooperates above-mentioned trailing edge slot antenna structure covering These three 4G communications bands of DCS, PCS, UMTS2100.Further, the present embodiment has incorporated frequency by improving feeding network Rate recombination function, by the way that gating circuit is rationally arranged, so that antenna during the work time can real-time perfoming according to actual needs Frequency range switching, the different operating frequency range of intelligent selection antenna.In addition, the present invention provides one kind, to can be realized terminal device entirely golden The antenna assembly for belonging to outside the pale of civilization shell is that metal covers other than the first gap 201 and the second gap 202 on metal shell 100 Lid, in other words, side, the back side of terminal device provided by the invention almost cover metal, have substantially carried out terminal The all-metal of equipment covers, and improves demand of the user to fuselage metal-like and aesthetic feeling.

Claims (8)

1. a kind of multifrequency terminal antenna for full metal jacket, including being installed in outside the metal at system circuit board (800) back side Shell (100), the gap (200) being opened on metal shell (100) and setting are in system circuit board (800) positive transmission network Network (900)；It is characterized by:
The edge of the metal shell (100) is equipped with the metal that side is extended to from the back side of system circuit board (800) Frame (102)；The first gap (201) and the second gap (202) and U-shaped folding gold are offered on the metal shell (100) Belong to piece (300)；The U-shaped folded metal piece (300) is partially suspended at system circuit board (800) upper front, U-shaped folded metal The both ends of piece (300) are connected down through in system circuit board (800) and with its back metal shell, so that U-shaped folding is golden Belong to piece and the first gap (201) form the gap of a single-ended opening；First gap (201) is dual-end type gap, Second gap (202) is single-ended open-type gap；First gap (201) and the second gap (202) are by metal edge frame (102) it is divided into mutually independent three sections；
The feeding network (900) includes: feed branch, match circuit and feed port (400)；Feed port (400) and phase It answers and is connected with match circuit between feed branch, feed branch is respectively across the first seam for being located at system circuit board (800) back side Gap (201) and the second gap (202).
2. a kind of multifrequency terminal antenna for full metal jacket according to claim 1, which is characterized in that the metal Frame (102) includes two long sides being oppositely arranged and two short sides, and two second short sides are oppositely arranged and are connected to two Between long side；The short side of first gap (201) and the second gap (202) close to metal edge frame (102) is arranged.
3. a kind of multifrequency terminal antenna for full metal jacket according to claim 2, which is characterized in that suspend setting The U-shaped folded metal piece (300) in part be also filled with nonmetallic materials therebetween with system circuit board (800) below.
4. a kind of multifrequency terminal antenna for full metal jacket according to claim 1, which is characterized in that further include choosing Circuit passband, the gating circuit (500) are connected between feed branch and feed port (400).
5. a kind of multifrequency terminal antenna for full metal jacket according to claim 4, which is characterized in that the gating Circuit includes detection circuit, comparison control circuit and gating switch.
6. a kind of multifrequency terminal antenna for full metal jacket according to any one of claims 1 to 5, feature exist In the width in gap is between 0.5 millimeter~5 millimeters on metal shell (100).
7. a kind of multifrequency terminal antenna for full metal jacket according to any one of claims 1 to 5, feature exist In, the opening width in gap and the of same size of gap or different, the opening width in the gap is between 0.5 millimeter~5 millis Between rice.
8. a kind of multifrequency terminal antenna for full metal jacket according to any one of claims 1 to 5, feature exist In the metal shell (100) is as systematically.
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