CN109390699B - Small-sized beam controllable patch antenna based on reconfigurable parasitic unit - Google Patents
Small-sized beam controllable patch antenna based on reconfigurable parasitic unit Download PDFInfo
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- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- 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
- H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
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Abstract
The invention discloses a small-sized beam controllable patch antenna based on a reconfigurable parasitic unit, which comprises an E-shaped main radiation patch and a left parasitic patch and a right parasitic patch. The invention reduces the electrical length of the parasitic patch by adopting the CSRR structure, and is beneficial to miniaturization of the parasitic patch. By providing different values of DC bias voltages to PIN diodes loaded on the CSRR structure, single parasitic units can respectively work in two states of the director and the reflector; the combination of different states of the left parasitic element and the right parasitic element can enable the main lobe direction of the radiation beam of the antenna to be discretely switched between 0 degree, 30 degrees and 30 degrees, thereby realizing the beam controllability of the antenna and effectively widening the beam scanning range of the antenna. The coaxial feed E-shaped main radiation patch and the air layer structure between the two dielectric plates are adopted, so that the working bandwidth of the antenna is effectively increased, and the coaxial feed E-shaped main radiation patch has the excellent performances of high gain, high front-to-back ratio and low profile.
Description
Technical Field
The invention relates to the field of antenna research in the field of wireless mobile communication, in particular to a small-sized beam controllable patch antenna based on a reconfigurable parasitic unit.
Background
The beam controllable antenna has the characteristic of beam reconstruction in a fixed frequency band, can expand the coverage range of a transmission signal, and improves the scanning capability of the 5G MIMO antenna, thus being a subject with great research significance. In the past years, researchers have therefore proposed a large number of beam-steering antennas, which mainly use the following methods to achieve beam-reconfigurable characteristics-new material technology, reconfigurable feed networks, reconfigurable electromagnetic supersurfaces, control parasitic elements and different modes of operation of the excitation radiator, etc.
The beam control can be easily performed by changing the shape of the material by using a new material technology, but the required cost is high, and the reconstruction speed is low; realizing a beam reconfigurable antenna, such as a butler matrix, with a reconfigurable feed network has the advantages of low loss, wide frequency band, but requires excitation of more than two radiating elements; the reconfigurable electromagnetic super surface can meet the requirement of high gain, but the required space is large, the manufacturing cost is high, the structure is complex, and dozens of elements are often excited; the size of the antenna can be reduced by controlling the beam by controlling the shape of the radiator, but the working bandwidth of the antenna is very narrow, and meanwhile, an additional feed network is required to excite different feed ports so as to realize beam scanning; the beam steerable antenna constructed by reconstructing the parasitic elements around the main radiator requires a very large number of elements, and a steerable beam antenna requiring fewer elements is proposed in the document X.Ding, Y.F.Cheng, W.Shao, H.Li, B.Z.Wang and d.e. anagnostu, "a wide-angle scanning planar phased array with pattern reconfigurable magnetic current element," IEEE trans. Antenna production, vol.65, no.3, pp.1434-1439, mar.2017, but this type of antenna often requires a higher profile or a metal housing. In the literature M.Li, S.Q.Xiao, Z.Wang and b.z. wang, "Compact surface-wave assisted beam-steerable antenna based on HIS," IEEE trans.antenna s production, vol.62, no.7, pp.3511-3519, jul.2014 there is also mentioned a way to reduce the number of elements required by reconstructing microstrip lines around a patch, but the operating bandwidth of the antenna is lower, below 4%.
Disclosure of Invention
The invention provides a small patch antenna for controlling a wave beam by utilizing a CSRR (complementary split-ring resonator), which solves the problems of small inclination angle and scanning range, narrow bandwidth, excessive number of required parasitic units, complex structure, larger volume and the like of a traditional pattern reconfigurable antenna.
The aim of the invention is achieved by the following technical scheme: a small-sized beam controllable patch antenna based on a reconfigurable parasitic unit is characterized in that a main radiation patch and left and right parasitic patches are placed on the upper surface of an upper dielectric plate, a layer of metal floor is attached to the lower surface of a lower dielectric plate, and two CSRR structures corresponding to the upper parasitic patches are etched on the metal floor; each parasitic patch and the CSRR structure loaded on the corresponding metal floor together form a parasitic unit; the main radiation patch is fed by a coaxial cable, an inner core of the coaxial cable is connected with the main radiation patch, and an outer conductor is connected with the metal floor; the upper dielectric plate and the lower dielectric plate are parallel with each other at a certain distance. In the invention, the parasitic unit adopts a CSRR structure and is equivalent to an LC parallel resonance loop, so that the resonance frequency of the parasitic patch can be reduced, the size of the parasitic unit can be reduced, and the volume of the antenna can be further reduced. The capacitive effect of the air layer between the upper dielectric plate and the lower dielectric plate effectively widens the working bandwidth of the antenna.
Preferably, the two parasitic elements are switched between two states of the director and the reflector to realize functional multiplexing, and when the two parasitic elements are both directors, the antenna is in a state I radiating to the +z direction; when the left parasitic element is a director and the right is a reflector, the antenna is in a state II radiating in the-x direction, and otherwise in a state III. The combination of the two working states can lead the antenna to increase the inclination angle of the main lobe and the beam scanning range without increasing the number and the volume of directors, and widen the effective working frequency band. Multiplexing and combined use of the parasitic elements is achieved. The different combinations among the parasitic units enable the main lobe directions of the radiation beams of the antenna to be discretely switched between 0 degree, 30 degrees and 30 degrees, so that the beam controllability of the antenna is realized, and the beam scanning coverage range is effectively widened.
Preferably, a PIN diode for realizing the state switching of the parasitic unit is arranged in the gap of each CSRR structure, the cathode of the PIN diode is connected with the metal floor, the anode is connected with the patch in the center of the CSRR structure, meanwhile, the anode is connected with the parasitic patch on the upper surface of the upper dielectric plate through a direct current connection probe, and the connection and disconnection of the PIN diode are realized by providing bias voltage for the anode of the PIN diode.
Further, bias voltages V are respectively provided for anodes of the two PIN diodes 1 And V 2 The PIN diode is turned on to operate the parasitic element in the director state when the corresponding control voltage is high, and turned off to the reflector state when the corresponding control voltage is low. Thereby switching the parasitic element between the director and reflector states.
Further, a first capacitor for dc isolation and maintaining RF current continuity is placed in the slot of each CSRR structure.
Preferably, each parasitic patch is connected to a first dc pad through an inductive element to prevent RF current from flowing from the parasitic patch to the metal floor, thereby achieving isolation of RF current.
Further, a second DC pad is provided on the metal floor at a position corresponding to the upper first DC pad, and the second DC pad is connected to the metal floor through a second capacitor for maintaining the continuity of RF current on the metal floor.
Preferably, the main radiation patch adopts an E-shaped main radiation patch, and the patch is formed by removing two open gaps from a rectangular patch. A new resonance mode is introduced on the basis of the single resonance mode of the original traditional directional patch, so that the working bandwidth of the antenna is increased.
Preferably, the upper dielectric plate and the lower dielectric plate are fixed by a plurality of nylon columns.
Preferably, the upper dielectric plate and the lower dielectric plate are spaced by 5mm. The equivalent capacitance effect of the air layer interval widens the working bandwidth of the antenna to a great extent, and compared with the former working bandwidth which is less than 4%, the antenna has the working bandwidth of 8.8%.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention forms a parasitic unit by loading a CSRR structure on a floor corresponding to the parasitic patch. The LC parallel resonant circuit equivalent to the loading of the CSRR structure can effectively reduce the size of the parasitic element, thereby reducing the volume of the antenna.
2. The invention places PIN diode in CSRR gap, and can make parasitic unit work in two states of director and reverser through simple control circuit.
3. The combination of different states of the parasitic units enables the main lobe of the antenna radiation beam to be discretely switched among three directions, so that the beam controllability of the antenna is realized, and the beam scanning range of the antenna is effectively widened; the functional multiplexing of the parasitic elements also reduces the number of directors required for the antenna; the combination of the two working states of the director and the reflector increases the inclination angle of the main lobe of the antenna beam, and widens the effective working frequency band.
4. The E-shaped patch is adopted as the main patch, and an air layer interval of about 5mm is arranged between the two dielectric plates, so that the working bandwidth is effectively widened.
5. The patch antenna has the excellent performances of high gain and low profile.
6. The use of fewer capacitors in the present invention ensures the continuity and dc isolation of the RF current in the antenna.
7. The use of inductive elements in the present invention achieves isolation of RF currents.
8. The patch antenna does not need to occupy large space and more components to realize requirements, reduces the complexity of the structure, has simple circuit structure, wider frequency band, compact size, high gain, low profile, few used elements, large front-back ratio value and large main lobe inclination angle.
Drawings
Fig. 1 is a side view of a small beam steerable patch antenna based on reconfigurable parasitic elements provided by an embodiment of the present invention;
fig. 2 is a top view of a patch antenna provided by an embodiment of the present invention;
fig. 2 (a) is a schematic diagram of a lower dielectric plate and a metal floor of a patch antenna according to an embodiment of the present invention;
FIG. 3 shows the reflectance S of an embodiment of the invention operating in three states 11 Simulation and test result graph of frequency: FIG. 3 (a) State I; FIG. 3 (b) State II; FIG. 3 (c) State III;
fig. 4 is a simulated 3D radiation pattern at 3.4GHz for a small beam steerable patch antenna based on reconfigurable parasitic elements provided by one embodiment of the present invention in three states: FIG. 4 (a) is a schematic diagram of the antenna placement position during simulation, and FIG. 4 (b) is a state I; FIG. 4 (c) State II; fig. 4 (d) state iii;
FIG. 5 is a normalized simulated radiation pattern of co-polarization and cross-polarization at (a) 3.3GHz, (b) 3.4GHz, and (c) 3.5GHz, respectively, for a small beam-steering patch antenna based on reconfigurable parasitic elements provided by one embodiment of the invention in states I, II and III;
FIG. 6 is a normalized test radiation pattern for co-polarization and cross-polarization at (a) 3.3GHz, (b) 3.4GHz, and (c) 3.5GHz, respectively, for a reconfigurable parasitic element-based miniature beam-steering patch antenna provided by one embodiment of the present invention in states I, II and III, respectively;
FIG. 7 is a simulated main lobe direction and a test main lobe direction of a beam provided by an embodiment of the present invention;
fig. 8 is a graph of simulation and test results of maximum gain curve versus frequency at states I, II and III, respectively, provided by an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For ease of description, the following description and the accompanying drawings will take as examples a patch antenna with a steerable small beam and illustrate the structure of a patch antenna provided by an embodiment of the present invention, and it should be understood that the embodiment of the present invention is not limited to the steerable small beam patch antenna, but includes all reconfigurable antennas having the features of the present invention.
Fig. 1 is a side view of a beam controllable patch antenna based on a reconfigurable parasitic element according to an embodiment of the present invention. The antenna comprises an upper dielectric plate 1, a main radiation patch 2, nylon posts 3, a lower dielectric plate 4, a metal floor 5, a coaxial cable 6 and a direct current connection probe 7, wherein the main radiation patch 2 is arranged on the upper surface of the upper dielectric plate 1 and is connected with an inner core of the coaxial cable 6 with the impedance of 50 omega, an outer conductor of the coaxial cable 6 is connected with the metal floor 5 of the antenna, the metal floor 5 is attached to the lower surface of the lower dielectric plate 4, and the two dielectric plates are supported by the four nylon posts 3.
In the embodiment of the steerable patch antenna based on reconfigurable parasitic elements shown in fig. 1, a Rogers RO 4350B dielectric plate is used to form an upper dielectric plate 1 and a lower dielectric plate 4 with a thickness of 1.524mm, and a PEC plate with a thickness of 0.035mm is attached to the lower surface of the lower dielectric plate 4 as the metal floor 5. The Rogers RO 4350B dielectric plate can use the relative dielectric constant epsilon r Material with loss tangent of 0.004 and=3.48. The distance between the upper dielectric plate 1 and the lower dielectric plate 4 is 5.0mm, and the working bandwidth of the antenna is effectively widened due to the capacitance effect of the air layer.
The structure of each part on the two dielectric plates will be described in detail with reference to fig. 2 and 2 (a).
As shown in fig. 2 and 2 (a), the antenna is divided into an upper half part and a lower half part, wherein the upper half part comprises an E-shaped main radiation patch 2, a parasitic patch 8, an inductance element 9 and a first direct current bonding pad 10, and the lower half part comprises a CSRR structure 11, a PIN diode 12, a first capacitor 13, a second capacitor 14 and a second direct current bonding pad 15. The cathode of the PIN diode 12 is connected to the metal floor 5 and the anode is connected to the patch in the center of the CSRR structure 11, while the anode is connected to the parasitic patch 8 via a dc connection probe 7. Providing bias voltages V to anodes of the two parasitic element PIN diodes 12, respectively 1 And V 2 The PIN diode can be controlled to be turned on and off, so that a single parasitic unit works in two states of the director and the reflector respectively, the antenna works in different states by combining different states of the parasitic unit, the reconfigurable performance of the antenna is realized, and the beam scanning range of the antenna is effectively widened. The repeated use of the parasitic element also reduces the number of directors required by the antenna, and the combination of the two working states of the directors and the reflectors increases the inclination angle of the main lobe of the antenna, so that the effective working frequency band is widened.
As shown in fig. 2 and 2 (a), each parasitic patch 8 is connected to a first dc pad 10 through an inductance element 9 on the upper surface of the upper dielectric plate 1, so as to isolate RF current. A second dc pad 15 is provided vertically below each first dc pad 10, i.e. at a corresponding location on the metal floor 5, which second dc pad 15 is connected to the metal floor 5 via a second capacitor 14, so that the RF current on the floor surface is continuous.
In addition, a first capacitor 13 is placed in the slot of the CSRR to achieve dc isolation and maintain continuity of RF current on the floor 5.
As shown in FIGS. 3 (a), (b) and (c), the reflection coefficient S provided by one embodiment of the present invention operates in states I, II and III, respectively 11 Frequency and gain curve-frequency simulation result plot. It can be seen that the simulated impedance bandwidths are 3.16-3.83GHz, and 3.16-3.83GHz at states I, II and III, respectively, and the simulated overlap impedance bandwidths are 3.16-3.83GHz (0.67 GHz, 19.0%). The impedance bandwidths tested were 3.15-3.79GHz,3.18-3.86GHz and 3.18-3.82GHz in states I, II and III, respectively. The tested overlap impedance bandwidth was 3.15-3.82GHz (0.67 GHz, 19.0%). It can be seen that in all three states, the simulation result S 11 And test result S 11 Has good consistency.
As shown in fig. 4 (a), (b), and (c), a simulated 3D radiation pattern is provided for one embodiment of the present invention operating at 3.4GHz at states I, II and III, respectively. It is easy to see that the main lobe direction of the radiation beam of the antenna can be discretely switched among three directions, so that the beam controllability of the antenna is realized, and the beam scanning range of the antenna is effectively widened.
As shown in fig. 5 and 6, a miniaturized beam steerable patch antenna based on reconfigurable parasitic elements provided by an embodiment of the present invention is a simulated and tested radiation pattern for the E-plane from 3.3GHz to 3.5GHz at 0.1GHz intervals in states I, II and III. It can be seen that the antenna achieves good beam reconfigurability and high gain performance at bandwidths from 3.3GHz to 3.5GHz, with the radiation pattern pointing in the +z direction in state I, tilting in the-X direction in state II, tilting in the +x direction in state III, and with the radiation pattern back lobe being about 14dB and the 3dB beamwidth being about 70 ° in different states, with the back lobe being 10dB less than the main lobe in all states.
As shown in fig. 7, the directions of the main lobe of the beam provided by the embodiment of the invention are respectively 0 °, -25 °, 25 ° in states I, II and III, the main lobe directions of the test results float from 3 ° to 5 ° in state I, from-18 ° to-34 ° in state II, and from 15 ° to 34 ° in state III, different combinations between parasitic units enable the main lobe directions of the radiation beam of the antenna to be discretely switched, the measured main lobe directions are quite close to the simulation results, and the differences between the simulation results and the test results are due to manufacturing and test errors.
As shown in fig. 8, the simulation results and test results of the maximum gain curve versus frequency at states I, II and III, respectively, are provided by an embodiment of the present invention, where the simulation results are coincident with states II and III. As can be seen from the graph, the maximum gain range for the simulation results shown in the gain curve is from 6.10 to 7.62dBi in state I, from 6.84 to 7.95dBi in state II, and from 6.84 to 7.95dBi in state III. Because states II and III are "E" shaped main radiating patches and a parasitic element act together, while state I only acts as a main radiating patch, the maximum gain in state I is lower than the maximum gain for states II and III in the operating band, but the measured maximum gain is quite close to the simulation value, the difference between the simulation gain and the test gain being due to manufacturing and test errors.
The embodiment of the invention has the following advantages:
1. the CSRR structure can reduce the resonance frequency of the parasitic patch, thereby reducing the size of the parasitic element and the overall size of the antenna;
2. the CSRR structure is used, so that the antenna has very steep stop band transmission characteristics, a PIN diode is placed in a CSRR slot, and a parasitic unit can respectively work in two states of a director and a reverser through a simple direct current control circuit;
3. the parasitic patch corresponds to the CSRR structure loaded on the floor and is used as a parasitic unit to control the deviation of the directional diagram, so that the direction of a main lobe of a radiation beam of the antenna can be discretely switched between 0 DEG, -30 DEG and 30 DEG, the beam controllability of the antenna is realized, and the beam scanning range of the antenna is effectively widened; the repeated use of parasitic elements also reduces the number of directors required for the antenna; the combination of the two working states of the director and the reflector can increase the inclination angle of the main lobe of the antenna beam, and the effective working frequency band is widened;
4. under the condition of compact structure and small volume of the antenna, the antenna has wider frequency coverage range and 8.8% of working bandwidth;
5. the patch antenna has excellent performance of high gain and low profile;
6. the use of fewer capacitors and inductive elements ensures the continuity and necessary isolation of the current in the antenna;
7. compared with the prior work, the antenna has wider bandwidth, simple and compact structure, low profile, fewer active elements, quite high gain, larger main lobe inclination angle and front-back ratio value, and better performance.
The embodiment provided by the invention can be applied to receiving and transmitting equipment of various wireless communication systems, and an antenna working in the frequency band of 3.25-3.55 GHz. While benefiting from PIN switches, parasitic patches and CSRR, the invention also has beam steering capabilities.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (7)
1. A miniature wave beam controllable patch antenna based on a reconfigurable parasitic unit is characterized in that a main radiation patch and left and right parasitic patches are placed on the upper surface of an upper dielectric plate, a layer of metal floor is attached to the lower surface of a lower dielectric plate, and two CSRR structures corresponding to the upper parasitic patches are etched on the metal floor; each parasitic patch and the CSRR structure loaded on the corresponding metal floor together form a parasitic unit; the main radiation patch is fed by a coaxial cable, an inner core of the coaxial cable is connected with the main radiation patch, and an outer conductor is connected with the metal floor; the upper dielectric plate and the lower dielectric plate are parallel with each other at a certain distance;
the two parasitic units are switched between the director and the reflector to realize functional multiplexing, and when the two parasitic units are both directors, the antenna is in a state I radiating to the +z direction; when the left parasitic element is a director and the right parasitic element is a reflector, the antenna is in a state II radiating in the-x direction, and otherwise, the antenna is in a state III;
a PIN diode for realizing the state switching of the parasitic unit is arranged in a gap of each CSRR structure, the cathode of the PIN diode is connected with a metal floor, the anode is connected with a patch at the center of the CSRR structure, meanwhile, the anode is connected with the parasitic patch on the upper surface of the upper dielectric plate through a direct current connection probe, and the connection and disconnection of the PIN diode are realized by providing bias voltage for the anode of the PIN diode;
each parasitic patch is connected with a first direct current welding disk through an inductance element so as to prevent RF current from flowing from the parasitic patch to the metal floor, and isolation of the RF current is realized.
2. The reconfigurable parasitic element-based small beam controllable patch antenna of claim 1, wherein the anodes of the two PIN diodes are respectively provided with a bias voltage V 1 And V 2 The PIN diode is turned on to operate the parasitic element in the director state when the corresponding control voltage is high, and turned off to the reflector state when the corresponding control voltage is low.
3. The reconfigurable parasitic element-based beamlet controllable patch antenna of claim 1, wherein a first capacitor for achieving dc isolation and maintaining RF current continuity is disposed in the slot of each CSRR structure.
4. The reconfigurable parasitic element-based beamlet controllable patch antenna of claim 1, wherein a second dc pad is provided on the metal floor at a location corresponding to the upper first dc pad, the second dc pad being connected to the metal floor by a second capacitor for maintaining RF current continuity on the metal floor.
5. The reconfigurable parasitic element based small beam steerable patch antenna of claim 1, wherein the main radiating patch is an "E" shaped main radiating patch, the patch being formed by a rectangular patch with two open slots removed.
6. The reconfigurable parasitic element based beamlet controllable patch antenna of claim 1, wherein the upper dielectric plate and the lower dielectric plate are fixed with a plurality of nylon posts.
7. The reconfigurable parasitic element based beamlet controllable patch antenna of claim 1, wherein the spacing between the upper and lower dielectric plates is 5mm.
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| CN103346392A (en) * | 2013-06-08 | 2013-10-09 | 哈尔滨工程大学 | Mobile phone antenna with reconfigurable directional diagram |
| CN103794879A (en) * | 2014-01-23 | 2014-05-14 | 电子科技大学 | Small beam-switchable antenna capable of conducting omni-directional scanning in H face perpendicular to antenna plane |
| CN106229682A (en) * | 2016-10-12 | 2016-12-14 | 哈尔滨工业大学 | A kind of double frequency directional diagram reconstructable dielectric resonator antenna |
| CN107565221A (en) * | 2017-08-04 | 2018-01-09 | 深圳市景程信息科技有限公司 | antenna system based on graphene |
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2018
- 2018-11-19 CN CN201811376850.6A patent/CN109390699B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346392A (en) * | 2013-06-08 | 2013-10-09 | 哈尔滨工程大学 | Mobile phone antenna with reconfigurable directional diagram |
| CN103794879A (en) * | 2014-01-23 | 2014-05-14 | 电子科技大学 | Small beam-switchable antenna capable of conducting omni-directional scanning in H face perpendicular to antenna plane |
| CN106229682A (en) * | 2016-10-12 | 2016-12-14 | 哈尔滨工业大学 | A kind of double frequency directional diagram reconstructable dielectric resonator antenna |
| CN107565221A (en) * | 2017-08-04 | 2018-01-09 | 深圳市景程信息科技有限公司 | antenna system based on graphene |
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