CN204243209U - Ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster - Google Patents
Ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster Download PDFInfo
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- CN204243209U CN204243209U CN201420770417.1U CN201420770417U CN204243209U CN 204243209 U CN204243209 U CN 204243209U CN 201420770417 U CN201420770417 U CN 201420770417U CN 204243209 U CN204243209 U CN 204243209U
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Abstract
The utility model relates to absorbing material technical field, be specifically related to a kind of broadband based on bow-tie type paster and inhale ripple Rotating fields, comprise metal base plate, dielectric layer and frequency-selective surfaces, described dielectric layer is arranged on metal base plate, described frequency-selective surfaces is arranged on dielectric layer, described frequency-selective surfaces is inhaled ripple unit by multiple rectangles of periodic arrangement and is formed, and each rectangle is inhaled ripple unit and comprised a Rectangular Enclosure with Participating Media layer, and described Rectangular Enclosure with Participating Media layer is provided with a bow-tie type metal patch.The utility model adopts the mode reducing whole rectangle suction ripple cell size to limit the size of Rectangular Enclosure with Participating Media layer, effectively suppresses the spatial of high-rder mode.And design bow-tie type metal patch at Rectangular Enclosure with Participating Media layer, effectively expand the bandwidth at resonance frequency place, have devised a kind of broadband ultrathin type and inhale ripple Rotating fields.
Description
Technical field
The utility model relates to absorbing material technical field, is specifically related to a kind of broadband based on bow-tie type paster and inhales ripple Rotating fields.
Background technology
Radar absorbing always is the focus that countries in the world are studied, in military, the reconnaissance range (distance) of the other side's radar can be reduced by the RCS reducing military unit, increase the emergentness of one's own side's attack, reduce military unit and be found by the probability eliminated.Civilian aspect then can reduce the coupling of antenna array element, increases stability and the reliability [1,2] of antenna element.Generally speaking, good radar absorbing requires bandwidth, and thin profile, mechanical strength is high, and wave absorbing efficiency is good.International scholar expands a large amount of related works for this reason, goes out various forms of suction ripple layer according to respective Demand Design.Enghetan in 2002 first year proposition Metamaterial obtain the thought [3] of ultra-thin superabsorbent material, frequency-selective surfaces (Fss) is utilized to realize the design of absorbing material, and obtain concern [4 widely, 5], the group of Nanyang Technological University Shen Zhongxiang professor [6-8] leader have developed the suction ripple layer design of a collection of FSS and derived structure thereof, and 10dB bandwidth is roughly about 80%.This class formation is owing to being all based on printed circuit board (PCB), and structure is relatively compact, and mechanical strength is strong, and processing and fabricating is easy, and inhales ripple layer compared to early stage Salisbury and Janmann, and this class formation has the thinner section of wider bandwidth sum.2008, Landy etc. propose a kind of " perfect wave-absorber " [9] based on periodicity resonant element, peak value place absorptivity almost reaches 100%, cause the great interest of researcher, multiple wave-absorber is suggested [10-12] subsequently, mostly forms electromagnetic resonator by the metallic film and dielectric substrate with certain pattern and forms, have thickness thin, the feature that absorbability is strong, but absorption band is narrower usually.Its reason is, the periodic unit general Q value presenting resonance characteristic is higher, and more responsive to frequency change, frequency place can show good characteristic, but Bandwidth-Constrained, cannot wider bandwidth be obtained.
Utility model content
Solve the problems of the technologies described above, the utility model provides a kind of broadband based on bow-tie type paster and inhales ripple Rotating fields, high-rder mode can be made to become decaying wave according to the reduction of periodic structure size and suppress its principle of reflection, adopt the mode reducing whole rectangle suction ripple cell size to limit the size of Rectangular Enclosure with Participating Media layer, effectively suppress the spatial of high-rder mode.And design bow-tie type metal patch at Rectangular Enclosure with Participating Media layer, effectively expand the bandwidth at resonance frequency place, have devised a kind of broadband ultrathin type and inhale ripple Rotating fields.
In order to achieve the above object, the technical scheme that the utility model adopts is, ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster, comprise metal base plate, dielectric layer and frequency-selective surfaces, described dielectric layer is arranged on metal base plate, and described frequency-selective surfaces is arranged on dielectric layer, and described frequency-selective surfaces is inhaled ripple unit by multiple rectangles of periodic arrangement and formed, each rectangle is inhaled ripple unit and is comprised a Rectangular Enclosure with Participating Media layer, and described Rectangular Enclosure with Participating Media layer is provided with a bow-tie type metal patch.
Further, described bow-tie type metal patch is broadened by four hypotenuses gradually from center to both sides, four hypotenuses horizontal expansion one minor face separately, and four minor face opposite sides are connected with two broadsides by two pairs of parallel edges, forms bow-tie type metal patch structure.
Further, described rectangle is inhaled the length of ripple unit and is widely respectively D
xand D
y, wherein, D
x=21mm, D
y=45mm.This size effectively can limit the size that rectangle inhales the size of ripple unit, is conducive to making excellent microwave and inhales ripple screen.
Further, described bow-tie type metal patch center is provided with a breach, connects a resistor in described breach.The electromagnetic wave energy that absorption frequency selects surface is carried out by resistor.
Further, described gap width is 1mm.
Ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster, comprise metal base plate, dielectric layer and frequency-selective surfaces, described dielectric layer is arranged on metal base plate, described frequency-selective surfaces is arranged on dielectric layer, described frequency-selective surfaces is inhaled ripple unit by multiple rectangles of periodic arrangement and is formed, each rectangle is inhaled ripple unit and is comprised a Rectangular Enclosure with Participating Media layer, and described Rectangular Enclosure with Participating Media layer is provided with multiple bow-tie type metal patch.
Further, the shape of multiple bow-tie type metal patch is identical but vary in size, and different bow-tie type metal patch size is for different resonance frequency.
Further, described bow-tie type metal patch number is 2.
Further, bow-tie type metal patch described in each is broadened by four hypotenuses gradually from center to both sides, four hypotenuses horizontal expansion one minor face separately, and four minor face opposite sides are connected with two broadsides by two pairs of parallel edges, forms bow-tie type metal patch structure.
Further, described rectangle is inhaled the length of ripple unit and is widely respectively D
xand D
y, wherein, D
x=21mm, D
y=45mm.This size effectively can limit the size that rectangle inhales the size of ripple unit, is conducive to making excellent microwave and inhales ripple screen.
Further, described in each, bow-tie type metal patch center is provided with a breach, connects a resistor in described breach.The electromagnetic wave energy that absorption frequency selects surface is carried out by resistor.
Further, described gap width is 1mm.
The utility model is by adopting technique scheme, and compared with prior art, tool has the following advantages:
The utility model by being provided with a bow-tie type metal patch on the Rectangular Enclosure with Participating Media layer of each rectangle suction ripple unit.Loaded by capacitive, electric current can be allowed to flow through along the horizontal two-arm of paster, thus add suction ripple cell current path.This bow-tie type paster is not again the bow-tie type of standard, but adopts " distortion bow-tie type paster ", and this is conducive to ensureing broadband character, and the path of all electric currents in certain frequency range, makes more electric current and patch resonant.
The utility model also by arranging multiple bow-tie type metal patch on the Rectangular Enclosure with Participating Media layer of each rectangle suction ripple unit, adopt multi-resonant Unit Design, different size is set in one-period unit but the identical bow-tie type paster structure of shape, due to the corresponding different resonance frequency of different patch length, design the frequency-selective surfaces of multi-resonant characteristic.
The utility model adopts bow-tie type metal patch center to be provided with a breach, connects a resistor in described breach, carrys out alternative Salisbury and Jaumann inhale the resistive coatings occurred in ripple layer by adopting resistor.The centre of complete distortion knot metal patch is washed out the breach of 1mm size, and connected by resistance.This resistance is utilized to carry out electromagnetic wave absorption energy.
By emulating and testing, the 10dB of this suction ripple layer inhales ripple rate bandwidth and reaches 90%, and the not enough frequency range center frequency point of its thickness is in 1/7 of free space wavelength.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1 of the present utility model.
Fig. 2 is that the rectangle of embodiment 1 of the present utility model inhales ripple cellular construction schematic diagram.
Fig. 3 is the structural representation of embodiment 2 of the present utility model.
Fig. 4 is that the rectangle of embodiment 2 of the present utility model inhales ripple cellular construction schematic diagram.
Fig. 5 is the equivalent circuit theory figure of embodiment 2 of the present utility model.
Fig. 6 is that the RCS of the simulation experiment result of embodiment 2 of the present utility model reduces correlation curve figure.
Embodiment
Now with embodiment, the utility model is further illustrated by reference to the accompanying drawings.
Embodiment 1:
As a specific embodiment, shown in figure 1 and Fig. 2, ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster of the present utility model, comprise metal base plate 1, dielectric layer 2 and frequency-selective surfaces 3, described dielectric layer 2 is arranged on metal base plate 1, described frequency-selective surfaces 3 is arranged on dielectric layer 2, described frequency-selective surfaces 3 is inhaled ripple unit 31 by multiple rectangles of periodic arrangement and is formed, each rectangle is inhaled ripple unit 31 and is comprised a Rectangular Enclosure with Participating Media layer 3131, and described Rectangular Enclosure with Participating Media layer 31 is provided with a bow-tie type metal patch 32.
Described bow-tie type metal patch 32 is broadened by four hypotenuses 321 gradually from center to both sides, four hypotenuses 321 horizontal expansion one minor face 322 separately, four minor face 322 opposite sides are connected with two broadsides 324 by two pairs of parallel edges 323, form bow-tie type metal patch 32 structure.In said structure, described center is symmetrical centre, and central horizontal is 2mm to the narrowest width.
Described rectangle is inhaled the length of ripple unit 31 and is widely respectively D
xand D
y, wherein, D
x=21mm, D
y=45mm.This size effectively can limit the size that rectangle inhales the size of ripple unit, is conducive to making excellent microwave and inhales ripple screen.
Described bow-tie type metal patch 32 center is provided with a breach, and in described breach horizontal direction, high-ranking military officer's junction metallic paster 32 is divided into two from center, and the width of described breach in the vertical direction is 1mm.A resistor is connected in described breach.The electromagnetic wave energy that absorption frequency selects surface is carried out by resistor.
Embodiment 2:
A design bow-tie type metal patch in suction ripple unit is have employed in embodiment 1, realize at certain resonance frequency place broadened bandwidth, but in order to reach the effect of ultra broadband, the utility model also by arranging multiple bow-tie type metal patch on the Rectangular Enclosure with Participating Media layer 31 of each rectangle suction ripple unit, adopt multi-resonant Unit Design, different size is set in one-period unit but the identical bow-tie type paster structure of shape, due to the corresponding different resonance frequency of different patch length, design the frequency-selective surfaces of multi-resonant characteristic.
Shown in figure 3 to Fig. 6, ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster, comprise metal base plate 1, dielectric layer 2 and frequency-selective surfaces 3, described dielectric layer 2 is arranged on metal base plate, described frequency-selective surfaces 3 is arranged on dielectric layer 2, described frequency-selective surfaces 3 is inhaled ripple unit 31 by multiple rectangles of periodic arrangement and is formed, each rectangle is inhaled ripple unit 31 and is comprised a Rectangular Enclosure with Participating Media layer 31, described Rectangular Enclosure with Participating Media layer 31 is provided with 2 bow-tie type metal patches 32, 32 ', in the present embodiment, for the purpose of simplifying the description, have employed 2 bow-tie type metal patches 32, Rectangular Enclosure with Participating Media layer 31 structural design of 32 '.The shape of 2 bow-tie type metal patches 32,32 ' is identical but vary in size, and different bow-tie type metal patch size is for different resonance frequency.Shown in figure 4, bow-tie type metal patch 32 size is greater than bow-tie type metal patch 32 ', bow-tie type metal patch 32 is arranged on the left side of Rectangular Enclosure with Participating Media layer 31, bow-tie type metal patch 32 ' is arranged on the right side of metal patch 31, and bow-tie type metal patch 32 length is greater than bow-tie type metal patch 32 ' has the horizontal symmetrical center be on same axis, that is, in the horizontal direction, 2 bow-tie type metal patches 32,32 ' have identical horizontal symmetrical central shaft.
From center, both sides are vertically broadened by four hypotenuses 321 described bow-tie type metal patch 32 gradually, four hypotenuses 321 horizontal expansion one minor face 322 separately, four minor face 322 opposite sides are connected with two broadsides 324 by two pairs of parallel edges 323, form bow-tie type metal patch 32 structure.In said structure, described center is symmetrical centre, and central horizontal is 2mm to the narrowest width.
Described in each, bow-tie type metal patch center is provided with a breach, and the width on described breach vertical direction is 1mm.Length in above-mentioned breach horizontal direction is 2mm, is central horizontal to the narrowest width.A resistor is connected in described breach.The electromagnetic wave energy that absorption frequency selects surface is carried out by resistor.
Shown in figure 4, described rectangle is inhaled the length of ripple unit 3 and is widely respectively D
xand D
y, wherein, D
x=21mm, D
y=45mm.This size effectively can limit the size that rectangle inhales the size of ripple unit, is conducive to making excellent microwave and inhales ripple screen.Fig. 4 illustrates in the vertical direction, partial distance parameter value between the upper broadside 324 of rectangle suction ripple unit 3 top, bow-tie type metal patch 32, minor face 322 above, horizontal symmetry axis, lower minor face 322, lower broadside 324, rectangle suction ripple unit 3 are following, and in the horizontal direction, 2 bow-tie type metal patches 32, distance d between 32 ' vertical symmetry axis, partial parameters value is as follows:
D
x＝21mm D
y＝45mm d＝7mm
l
11＝w
11＝0.5mm l
12＝15.5mm l
13＝17.5mm w
12＝1mm w
13＝4mm R
1＝200Ω
l
21＝w
21＝0.5mm l
22＝5.5mm l
23＝6.5mm w
22＝2.5mm w
23＝3mm R
2＝180Ω
In order to further illustrate the working mechanism of the present embodiment, suppose that electromagnetic wave vertical incidence is to this paper absorbent structure, E field polarization direction is
magnetic field polarised direction is
utilize the boundary condition on Rectangular Enclosure with Participating Media layer surface, can judge that the sense of current on Rectangular Enclosure with Participating Media layer is
then electric current just in time flow to other one end from one of paster section through resistance.By above analysis, above-mentioned wave-absorbing mechanism can be converted to Fig. 5 electrical equivalent:
The corresponding part of substrate sections, bow-tie type metal patch 32, bow-tie type metal patch 32 ' and free space, wherein the inductive effect of high-ranking military officer's junction metallic paster 32,32 ' part is changed as variable inductance is because consider the broadband effect of bow-tie type paster.Coupling capacitance between paster refers to bow-tie type metal patch 32, the ghost effect between 32 '.If dielectric layer surface is high impedance surface, i.e. Y
in2→ 0, according to circuit diagram 4, corresponding reflection coefficient calculation expression formula can be drawn:
Y
in1＝Y
1+Y
2+jωC
p
Wherein:
When resonance angular frequency electromagnetic wave incident, the paster of its correspondence presents pure conductance property, effectively can reduce the imaginary part of input admittance like this, likely makes reflection coefficient be reduced to a certain numerical value.The parameters of structure is optimized simultaneously, the reflection coefficient curve of the frequency range between resonance frequency is reduced to satisfied threshold value, then can design broadband and inhale ripple layer.
Analysis of simulation experiment: the utility model has made the copper coin of this sample and homalographic size according to above-mentioned parameter, and carried out the measurement of RCS, and carried out data and process, draw the reduction test data of sample, and obtain all the other theoretical simulation results, shown in figure 6, microwave herein inhales ripple Rotating fields 10dB Absorber Bandwidth from 1.71GHz ~ 4.48GHz, center frequency point is 3.1GHz, relative bandwidth is 90%, consider that the thickness of dielectric substrate is 12.7mm, reference center frequency is in free space wavelength, 1/7 of this thickness deficiency wavelength known, confirm the reasonability proposing to inhale ripple layer herein, reliability and superiority.
List of references:
[1]MUNK B.A.Frequency selective surface:theory and design[M],New York:John Wiley,2000
[2] Li Youquan; Zhang Guangfu; Yuan Naichang; Based on the absorbing material of AMC and the application in microstrip antenna [J] thereof, electric wave science journal, 2010,25 (2): 353-357
LI YOUQUAN,ZHANG GUANGFU YUAN NAICHANG,Ultra-thin absorber based on the AMC structure and its application to the microstrip antenna[J],Chinese Journal of Radio Science,2010,25(2):353-357
[3]ENGHETA N.,Thin absorbing screen using metamaterial surfaces [C],IEE AP-S Int,Symp.,San Antonio,TX,USA,2002,2:392-295
[4]MUNK B.A.,and PRYOR J.,On designing Jaumann and circuit analog absorbers(CA Absorbers)for oblique angle of incidence[J],IEEE Trans.Antennas Propagat.2007,55(1):186-193
[5] Liu Hongying, Sun Wei, Feng Yijun, Zhang Mingxue, kingliness unit, utilizes frequency-selective surfaces to improve the absorbing property [J] of microwave absorbing material S-band, microwave journal, 2006,22 (3): 10 ~ 13
LIU HONGYIN,SUN WEI,FENG YIJUN,ZHANG MINGXUE,WANG XIANGYUAN, Improving the S-band Performance of the Microwave Absorbing Material Utilizing Frequency Selective Surface[J],Journal of Microwaves,2006,22(3):10～13
[6]ZHENG B.Y.,and SHEN,Z.X.,Wideband radar absorbing material combining high-impedance transmission line and circuit analogue screen[J],Electron.Lett.,2008,44(4):318-319
[7]TANG W.,SHEN Z.X.,Simple design of thin and wideband circuit analogue absorber,Electron.,Lett.[J],2007,43(12),689-691
[8]YANG J.,SHEN Z.,X.,A thin and broadband absorber using double-square loops[J],IEEE Antennas Wirel.Propag.Lett.,2007,6:388-391
[9]LANDY N I,SAJUYIGBE S,MOCK J J,et al.A perfect metamaterial absorber[J],Phys Rev Lett,2008,100:207404
[10] Xu Ou, Zhu Min, Xu Jinping, Zhang Qiang, double-layer square ring can inhale the design of ripple screen and experimental study [J], electric wave science journal, 2009,24 (5): 837-844 by automatically controlled FSS
XU OU,ZHU MIN,XU JINPING,and ZHANG QIANG，Design and measurement of active absorber using the double layer square loop FSS[J],Chinese Journal of Radio Science,2009,24(5):837-844
[11] Liu Tao, Cao Xiangyu, Gao Jun, Zheng Qiurong, Yang Huanhuan, the design of Meta Materials wave-absorber and RCS Analysis [J], electric wave science journal, 2012,27 (6): 1219-1224
LIU TAO,CAO XIANGYU,GAO JUN,ZHENG QIURONG,YANG HUANHUAN,Design of metamaterial absorber and its characteristics of RCS[J],Chinese Journal of Radio Science,2012,27(6):1219-1224
[12] Wang Ying, Cheng Yongzhi, Nie Yan, Gong Rongzhou, based on the design of broad band low frequency Meta Materials wave-absorber and the experimental study [J] of lumped device, Acta Physica Sinica, 2013,62 (7): 074101
WANG YIN.,CENGYONGZHI,NIE YAN,GONG RONGZHOU,Design and experiments of low-frequency broadband metamaterial absorber based on lumped elements[J],Acta.Phys,Sin(in Chinese),2013,62(7):074101
[13]BALANIS C.A.,Antenna Theory:Analysis and Design[M],3
rdEdition,John Wiley&Sons,2005
[14]A.A.Eldek,A.Z.Elsherbeni and C.E.Smith,Wideband microstrip-fed printed bow-tie antenna for phased-array systems,Microw.Opt.Technol.Lett.,2004,43(2):123-126
Although specifically show in conjunction with preferred embodiment and describe the utility model; but those skilled in the art should be understood that; not departing from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection range of the present utility model.
Claims (8)
1. ripple Rotating fields is inhaled in the broadband based on bow-tie type paster, it is characterized in that: comprise metal base plate, dielectric layer and frequency-selective surfaces, described dielectric layer is arranged on metal base plate, described frequency-selective surfaces is arranged on dielectric layer, described frequency-selective surfaces is inhaled ripple unit by multiple rectangles of periodic arrangement and is formed, each rectangle is inhaled ripple unit and is comprised a Rectangular Enclosure with Participating Media layer, and described Rectangular Enclosure with Participating Media layer is provided with a bow-tie type metal patch.
2. ripple Rotating fields is inhaled in the broadband based on bow-tie type paster, it is characterized in that: comprise metal base plate, dielectric layer and frequency-selective surfaces, described dielectric layer is arranged on metal base plate, described frequency-selective surfaces is arranged on dielectric layer, described frequency-selective surfaces is inhaled ripple unit by multiple rectangles of periodic arrangement and is formed, each rectangle is inhaled ripple unit and is comprised a Rectangular Enclosure with Participating Media layer, and described Rectangular Enclosure with Participating Media layer is provided with multiple bow-tie type metal patch.
3. ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster according to claim 2, it is characterized in that: the shape of multiple bow-tie type metal patch is identical but vary in size, and different bow-tie type metal patch size is for different resonance frequency.
4. ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster according to claim 2, it is characterized in that: described bow-tie type metal patch number is 2.
5. ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster according to claim 1 and 2, it is characterized in that: described bow-tie type metal patch is broadened by four hypotenuses gradually from center to both sides, four hypotenuses horizontal expansion one minor face separately, four minor face opposite sides are connected with two broadsides by two pairs of parallel edges, form bow-tie type metal patch structure.
6. ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster according to claim 1 and 2, it is characterized in that: described rectangle is inhaled the length of ripple unit and is widely respectively D
xand D
y, wherein, D
x=21mm, D
y=45mm.
7. ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster according to claim 1 and 2, it is characterized in that: described bow-tie type metal patch center is provided with a breach, connect a resistor in described breach, carry out by resistor the electromagnetic wave energy that absorption frequency selects surface.
8. ripple Rotating fields is inhaled in a kind of broadband based on bow-tie type paster according to claim 7, it is characterized in that: described gap width is 1mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485516A (en) * | 2014-12-09 | 2015-04-01 | 汤炜 | Broadband wave absorbing layer structure based on bow tie type patches |
| CN109273860A (en) * | 2018-10-18 | 2019-01-25 | 哈尔滨工业大学 | Transmission line type broadband active frequency-selective surfaces |
| CN112821085A (en) * | 2020-12-31 | 2021-05-18 | 中南大学 | Multi-band tunable broadband wave absorber based on AFSS |
| CN113597246A (en) * | 2021-07-28 | 2021-11-02 | 维沃移动通信有限公司 | Shield case and electronic device |
-
2014
- 2014-12-09 CN CN201420770417.1U patent/CN204243209U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485516A (en) * | 2014-12-09 | 2015-04-01 | 汤炜 | Broadband wave absorbing layer structure based on bow tie type patches |
| CN109273860A (en) * | 2018-10-18 | 2019-01-25 | 哈尔滨工业大学 | Transmission line type broadband active frequency-selective surfaces |
| CN109273860B (en) * | 2018-10-18 | 2020-11-13 | 哈尔滨工业大学 | Transmission line type broadband active frequency selective surface |
| CN112821085A (en) * | 2020-12-31 | 2021-05-18 | 中南大学 | Multi-band tunable broadband wave absorber based on AFSS |
| CN112821085B (en) * | 2020-12-31 | 2022-03-11 | 中南大学 | Multi-band tunable broadband wave absorber based on AFSS |
| CN113597246A (en) * | 2021-07-28 | 2021-11-02 | 维沃移动通信有限公司 | Shield case and electronic device |
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