CN209993727U - Directional diagram reconfigurable planar array antenna based on digital coding representation - Google Patents
Directional diagram reconfigurable planar array antenna based on digital coding representation Download PDFInfo
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Abstract
The utility model discloses a planar array antenna is restructural to directional diagram based on digital coding sign, this array antenna includes coaxial connector, the medium base plate, be located the metal ground of medium base plate lower surface and be located the metal pattern of medium base plate upper surface, the metal pattern includes the coding unit paster, the mixed feed network paster of series-parallel connection and two-way merit divide the ware paster, the mixed feed network paster of series-parallel connection includes parallel connection's first principal feeder and second principal feeder, divide into 4 series feeder along first principal feeder and second principal feeder axial, every series feeder symmetric distribution is on first principal feeder or second principal feeder both sides, every series feeder both ends are connected with a coding unit paster respectively, and first principal feeder and second principal feeder divide the ware paster to be connected with coaxial connector through two-way merit. The utility model has the advantages of but low section, light in weight, high gain, radiation beam and shape real-time switch have wide application prospect.
Description
Technical Field
The utility model belongs to novel artifical electromagnetic material field relates to a directional diagram restructural plane array antenna based on digital coding sign.
Background
The directional diagram reconfigurable antenna can generate various radiation directional diagrams under the same frequency, and plays an important role in the field of information science. In recent years, methods for realizing a directional pattern reconfigurable antenna mainly include a mechanically adjustable substrate made of special materials and loading active devices, such as a PIN diode, a varactor, a micro-electromechanical system, a photosensitive switch and the like. However, most of the directional pattern reconfigurable antennas so far have only one or a few radiation elements, which limits the gain and beam reconfigurable capability of the directional pattern reconfigurable antenna. Conventional phased array technology can achieve high gain and various radiation beams of the antenna. However, the conventional phased array antenna is generally expensive, and the feeding structure is complex, which may affect the performance of the phased array antenna.
In 2014, the project group of the treegand iron troop of the southeast university provides a coding metamaterial for flexibly regulating and controlling electromagnetic waves by using a digital coding method, and experimental verification is carried out. Taking 1-bit digital coding metamaterial as an example, the numbers "0" and "1" respectively represent two phase response units with a phase difference of 180 °. Through the digital mode, the '0' unit and the '1' unit in the coding metamaterial are coded according to a specific sequence, electromagnetic waves can be flexibly and dynamically regulated, and a plurality of interesting physical phenomena and electromagnetic functional devices are realized. However, almost all electromagnetic devices based on encoding are used to manipulate scattered waves. Therefore, when these electromagnetic devices are used as antennas, additional primary feeds are required, which increases the volume of the whole antenna, is not favorable for integration, and also causes problems of complicated assembly and high cost.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model provides a low section, light, the high gain of quality, polycell based on directional diagram reconfigurable planar array antenna of digital coding sign.
The technical scheme is as follows: in order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a directional diagram reconfigurable planar array antenna based on digital coding representation comprises a coaxial connector, a dielectric substrate, a metal ground located on the lower surface of the dielectric substrate and a metal pattern located on the upper surface of the dielectric substrate, wherein the metal pattern comprises a coding unit patch, a series-parallel hybrid feed network patch and two-way power divider patches, the series-parallel hybrid feed network patch comprises a first main feed line and a second main feed line which are connected in parallel, the first main feed line and the second main feed line are axially divided into 4 series feed lines, each series feed line is symmetrically distributed on two sides of the first main feed line or the second main feed line, two ends of each series feed line are respectively connected with one coding unit patch, and the first main feed line and the second main feed line are connected with the coaxial connector through the two-way power divider patches.
Optionally, the coding unit patch includes a radiation metal patch and a switch line type phase shifter patch, the radiation metal patch is connected to the switch line type phase shifter via a first microstrip feeder, and the switch line type phase shifter is connected to the first main feeder or the second main feeder via a second microstrip feeder and a quarter-wavelength impedance match line.
Optionally, the radiating metal patch is rectangular, a groove is formed in the center of the edge of the radiating metal patch, which is adjacent to the switch line type phase shifter, and the first microstrip line is connected with the bottom of the groove.
Optionally, the coding unit patches present two radiation states with a phase difference of 180 ° according to different bias voltages at two ends of the switch line type phase shifter patch, and are used for simulating digital "0" and "1", and each radiation coding unit independently realizes two digital states of "0" and "1", and the planar array antenna can generate a plurality of coding patterns corresponding to a plurality of specific aperture phase distributions, thereby generating a plurality of radiation patterns at the same frequency.
Optionally, the switch-line phase shifter includes a delay phase channel, a reference phase channel, a first PIN diode D1, a second PIN diode D2, a third PIN diode D3, and a fourth PIN diode D4, wherein the delay phase channel and the reference phase channel are both "U" shaped, and the delay phase channel is longer than the reference phase channel by λ ″gA first microstrip feed line is connected with the delay phase channel and the reference phase channel through a first PIN diode D1 and a second PIN diode D2 respectively, and a second microstrip feed line is connected with the delay phase channel and the reference phase channel through a third PIN diode D3 and a fourth PIN diode D4 respectively; the first PIN diode D1, the second PIN diode D2, the third PIN diode D3 and the fourth PIN diode D4 are connected in series.
Optionally, when the first PIN diode D1 and the third PIN diode D3 are in an on state and the second PIN diode D2 and the fourth PIN diode D4 are in an off state, the microwave signal is transmitted from the delay phase channel; when the first PIN diode D1 and the third PIN diode D3 are in an off state and the second PIN diode D2 and the fourth PIN diode D4 are in an on state, a microwave signal is transmitted from the reference phase path.
Optionally, the dielectric substrate material is F4B, the dielectric constant is 2.65, and the loss tangent is 0.001.
Optionally, the distance between two adjacent coding unit patches along the axial direction of the first main feed line and the second main feed line is the guided wavelength λg。
Has the advantages that: compared with the prior art, the utility model has the advantages of it is following:
the traditional phased array antenna is expensive, and the feed structure is complex, which can affect the performance of the phased array antenna. The utility model discloses every antenna element only has 2 phase states in the directional diagram reconfigurable planar array antenna based on digital coding sign that constitutes, therefore feed structure is simple, and the gain is high, and is with low costs, and the quality is light, and antenna performance is superior.
The traditional electromagnetic devices based on coding are almost used for manipulating scattered waves, when the electromagnetic devices are used as antennas, additional primary feed sources are needed, the size of the whole antenna is increased, integration is not facilitated, and the problems of complex assembly and high cost are caused. The utility model discloses a directional diagram reconfigurable planar array antenna based on digital coding sign integrates antenna and coding device as an organic whole, directly regulates and control electromagnetic radiation wave beam, simple structure has reduced the section of antenna, changes in integrated design, popularization and application.
The utility model discloses in introducing the design of reconfigurable array antenna with digital coding technique, every radiation encoding unit only contains "0" and "1" two kinds of digital states in the directional diagram reconfigurable planar array antenna based on digital coding sign of structure, and the digital state is independent adjustable, consequently this planar array antenna can produce a plurality of coding patterns, every coding pattern corresponds a specific bore phase place and distributes, can produce a plurality of phase distributions on the antenna bore in real time through the coding pattern that switches array antenna dynamically promptly, consequently can produce multiple radiation pattern under same frequency. The radiation coding unit has good universality, and can be designed to work under different frequency points by changing the size of the radiation coding unit.
The utility model discloses the plane array antenna is restructured to directional diagram based on digital coding sign that constitutes, the beam number and the direction of its radiant wave can all be predicated from theory, under the condition of the cycle length of known free space wavelength, coding sequence along x and y direction, according to the formula alright calculate the angle of inclination theta and the azimuth phi of mainbeam, the directional diagram can independently design according to the demand.
Drawings
Fig. 1 is a schematic diagram of the array antenna structure of the present invention;
FIG. 2 is a schematic structural diagram of a radiation encoding unit according to the present invention;
fig. 3 is a simulation curve of the reflection amplitude varying with frequency when the radiation encoding unit feeds power through the reference phase channel and the delay phase channel in the embodiment of the present invention;
fig. 4 is a graph simulating the E-plane and H-plane patterns of the radiation encoding unit at 3.5GHz in the embodiment of the present invention;
fig. 5 is the simulated surface current distribution of the radiation encoding unit at 3.5GHz, fed through the reference phase channel and the delay phase channel in the embodiment of the present invention;
fig. 6 shows simulated surface current distributions of six different encoding modes of the directional diagram reconfigurable planar array antenna based on digital encoding representation in the embodiment of the present invention at 3.5GHz, where fig. 6(a) is an encoding mode P1, the state of the encoding unit is "0101" along the x direction, and the encoding unit is unchanged along the y direction; FIG. 6(b) shows an encoding scheme P2 in which the radiation encoding unit is in a "0" state; FIG. 6(c) shows an encoding scheme P3, wherein the state of the radiation encoding unit along the y direction is "1010" and is unchanged along the x direction; FIG. 6(d) shows an encoding scheme P4 where all adjacent radiation encoding elements are in opposite states; fig. 6(e) shows an encoding scheme P5; fig. 6(f) shows a coding scheme P6;
fig. 7 is a simulation curve of the directional diagram reconfigurable planar array antenna based on digital coding representation in the embodiment of the present invention, in six different coding modes, the reflection amplitude changes with frequency;
fig. 8 is an actual measurement two-dimensional remote pattern obtained by the pattern reconfigurable planar array antenna based on digital coding representation in the embodiment of the present invention at 3.5GHz in six different coding modes, where fig. 8(a), fig. 8(b), fig. 8(c), fig. 8(d), fig. 8(e), and fig. 8(f) correspond to coding modes P1, P2, P3, P4, P5, and P6, respectively;
fig. 9 is an experimental result diagram of the directional diagram reconfigurable planar array antenna based on digital coding representation in the embodiment of the present invention, in six different coding modes, the reflection amplitude changes with frequency.
Detailed Description
The invention is further described with reference to the following examples and the accompanying drawings.
The utility model relates to and made a directional diagram reconfigurable planar array antenna based on digital coding characterization, when the bias voltage through control switch line type phase shifter both ends was 1.5V, the switch line type phase shifter can switch two different transmission channels that have 180 phase differences for the radiation coding unit has "0" and "1" two kinds of coding states, is used for constructing 1 bit digital coding antenna. The utility model discloses in introducing the design of reconfigurable array antenna with digital coding technique, every radiation encoding unit only contains "0" and two kinds of digital states of "1" in the directional diagram reconfigurable planar array antenna based on digital coding sign of structure, and the digital state is independent adjustable. The array antenna can generate multiple coding patterns by independently controlling the "0" and "1" digital states of the 16 radiation encoding elements in the array antenna. Each code pattern corresponds to a specific aperture phase distribution, and the aperture phase distribution of the array antenna determines the far-field radiation pattern of the antenna. Therefore, by dynamically switching the encoding pattern of the array antenna, a variety of radiation patterns can be generated at the same frequency.
As shown in fig. 1, a directional diagram reconfigurable planar array antenna based on digital coding characterization comprises a coaxial connector 1, a dielectric substrate 2, a metal ground 3 located on the lower surface of the dielectric substrate, and a metal pattern 4 located on the upper surface of the dielectric substrate, wherein the metal pattern comprises a coding unit patch 41, a series-parallel hybrid feed network patch 42, and a two-way power divider patch 43, the series-parallel hybrid feed network patch comprises a first main feed line and a second main feed line which are connected in parallel in the x direction, and the first main feed line and the second main feed line are connected with a 50 Ω coaxial connector through two-way power divider patches with equal amplitude and same phase; each main feeder is divided into 4 series feeders in the y direction, each series feeder is symmetrically distributed on two sides of the first main feeder or the second main feeder, and two ends of each series feeder are respectively connected with a coding unit patch; the coding unit patches are arranged in the same direction along the y direction, and the distance d between two adjacent coding unit patchesyTo guide the wavelength lambdag(ii) a The initial phase of the four serially connected patch of code elements is therefore the same.
The embodiment of the utility model provides an adopt the dielectric constant to be 2.65, the loss tangent is 0.001, thickness is 1 mm's F4B material as the medium base plate of antenna, the coding unit paster moves the looks ware paster including radiation metal paster and switch line type, the radiation metal paster moves the looks ware through first microstrip feeder L3 and switch line type and is connected, the switch line type moves the looks ware through second microstrip feeder L4 and quarter wavelength impedance match line L5 and is connected with first main feeder or second main feeder.
As shown in the figure2, the radiation metal patch is rectangular, and a groove is arranged in the center of the adjacent side of the radiation metal patch and the switch line type phase shifter, the groove is used for realizing impedance matching and reducing reflection, and the first microstrip line is connected with the bottom of the groove. In order to reduce the section of the radiation coding unit and realize impedance matching, the radiation metal patch adopts a microstrip line edge feed mode. The structural parameters L, W, g and d of the radiation metal patch are respectively 26.5mm, 28.0mm, 6.8mm and 8.0mm after optimized design, and the radiation metal patch can have good radiation characteristics under the working frequency of 3.5 GHz. The width w of the second microstrip feed line L4 is 2.8mm to achieve 50 Ω impedance matching. In order to realize independent control of states of '0' and '1' of the radiating metal patch, a switch line type phase shifter patch is used, and the switch line type phase shifter patch is provided with two microwave signal transmission channels with different lengths and a path L1For delaying the phase path, path L2For the reference phase channel, the length of the delay phase channel and the reference phase channel are both U-shaped and L1And L2Length of (d) by agAnd/2, 4 PIN diodes are integrated on each switch linear phase shifter patch. The first microstrip feed line is connected with the delay phase channel and the reference phase channel through a first PIN diode D1 and a second PIN diode D2 respectively, and the second microstrip feed line is connected with the delay phase channel and the reference phase channel through a third PIN diode D3 and a fourth PIN diode D4 respectively; the anode of the first PIN diode D1 is connected with the delay phase channel, and the cathode is connected with the first microstrip feed line; the anode of the second PIN diode D2 is connected with the first microstrip feed line, and the cathode is connected with the reference phase channel; the anode of the third PIN diode D3 is connected with the second microstrip feed line, and the cathode is connected with the delay phase channel; the anode of the fourth PIN diode D4 is connected to the reference phase path and the cathode is connected to the second microstrip feed line. Namely, a first PIN diode D1, a second PIN diode D2, a third PIN diode D3, a fourth PIN diode D4, a delay phase path and a reference phase path are connected in series. When the first PIN diode D1 and the third PIN diode D3 are in an on state and the second PIN diode D2 and the fourth PIN diode D4 are in an off state, the microwave signal is transmitted from the delay phase path; when the first PIN diode D1 and the third PIN diode D3 are in an off state,when the second PIN diode D2 and the fourth PIN diode D4 are in an on state, a microwave signal is transmitted from the reference phase path. At a center frequency of 3.5GHz and a guided wavelength lambdagIs 58mm, length L1And L2The optimal values of (A) and (B) are respectively 54mm and 25mm, and the other structural parameters are L3＝15mm，L4＝5mm，L5＝14.7mm，a＝70mm，b＝65mm。
The coding unit patch, the corresponding medium substrate under the coding unit patch and the metal ground can be regarded as a radiation coding unit, and the structure shown in fig. 2 is a radiation coding unit.
Fig. 3 is a simulation curve of reflection amplitude as a function of frequency when the radiation encoding unit is fed through the reference phase channel and the delay phase channel, and the radiation encoding unit can be effectively driven at 3.5GHz under the two different excitations. Fig. 4 is a simulation curve of the E-plane and H-plane directional patterns of the radiation encoding unit at 3.5GHz, the maximum radiation direction of the radiation encoding unit points to the z-axis, and the gain reaches 6.86dB at the operating frequency of 3.5 GHz. Fig. 5 shows the simulated surface current distribution of the radiation encoding unit at 3.5GHz, fed by the reference phase channel and the delay phase channel, and the result shows that the current directions of the radiation encoding units are completely opposite under two different excitations, that is, one radiation encoding unit can generate two radiation states of "0" or "1" by adjusting the switch state of the PIN diode.
A one-bit coded planar array antenna can be designed by using 16 radiation coding units, and in order to better understand the coding mechanism of the reconfigurable planar array antenna, simulation surface current distribution of six different coding modes at 3.5GHz is given, as shown in fig. 6. Fig. 6(a) shows an encoding scheme P1(x-0101), in which the states of the radiation encoding cells in the x direction are "0101" and invariable in the y direction, fig. 6(b) shows an encoding scheme P2(0000), the radiation encoding cells are in the "0" state, fig. 6(c) shows an encoding scheme P3(y-1010), the states of the radiation encoding cells in the y direction are "1010" and invariable in the x direction, fig. 6(d) shows an encoding scheme P4 (checkerboard), all adjacent radiation encoding cells are in opposite states, and fig. 6(e) and fig. 6(f) show other encoding schemes P5 and P6. Besides the six coding modes, the designed directional diagram reconfigurable planar array antenna can also generate more coding modes, and all the coding modes are realized by switching the state of the phase shifter.
The embodiment of the utility model provides an in the directional diagram reconfigurable planar array antenna based on digital coding characterization when 3.5GHz, the angle of inclination theta and the azimuth phi of mainbeam can be predicted from theory by the following formula:
wherein λ is0Is the free space wavelength at 3.5GHz, gammaxAnd ΓyIs the period length of the code sequence in the x and y directions. The gain of the two main beams generated by the coding mode P1 and symmetrically distributed on the xoz plane is 17.6 dB. Take lambda0＝85.7mm，Γx＝228.6mm，ΓySubstituting equation (1) and equation (2) for ∞ yields a tilt angle θ of 22.3 °, similar to the simulation result of 21.7 °. For the encoding mode P2, the planar array antenna has no phase change along x and y directions, and should generate a main beam in z direction, the simulated gain is 17.9dB, and the grating lobes on both sides are caused by the oversize of the radiation encoding unit. For the encoding mode P3, the yoz plane of the planar array antenna generates two main beams with the inclination angle of 44.8 degrees, the gain is 14.8dB, and the value is gammax→∞，ΓyEquations (1) and (2) are substituted for 116mm, and the inclination angle θ and the two azimuth angles Φ are 47.4 °, 90 °, and 270 °, respectively. For the encoding mode P4, the planar array antenna generates four main beams with gain of 13.4dB, azimuth (52.6 °, 62.2 °), (52.6 °, 117.8 °), (52.6 °, 242.2 °), and (52.6 °, 297.8 °), in the upper half space, and takes Γx＝228.6mm，ΓyEquations (1) and (2) are substituted for 116mm, and θ is calculated to be 55.8 °, four azimuth angles Φ are 63.1 °, 116.9 °, 243.1 °, and 296.9 °.
Fig. 7 is a directional diagram based on digital coding characterization in the embodiment of the present inventionThe reconfigurable planar array antenna has the advantages that under six different coding modes, the return loss of the planar array antenna is very low at 3.5GHz for all the coding modes according to the simulation curve of the reflection amplitude changing along with the frequency. The simulation radiation efficiency of the directional diagram reconfigurable array antenna under the six coding modes is more than 76.2 percent. The whole digital coding representation-based directional diagram reconfigurable planar array antenna occupies 400 multiplied by 270mm2The impedance conversion line has a width of 1.55mm and a length of 14.7 mm.
In order to verify the effectiveness of the directional diagram reconfigurable planar array antenna based on the digital coding representation on experiments, a sample is manufactured by using a standard Printed Circuit Board (PCB) technology, and a remote radiation directional diagram test is carried out on the processed sample in a microwave darkroom. In the experiment, the PIN diode model used by people is Skyworks SMP1321-079LF, and for each radiation coding unit, one wire is connected to a Direct Current (DC) voltage power supply, and the polarity of the driving voltage of each of the 16 coding radiation units can be independently controlled.
Fig. 8 is the embodiment of the utility model provides an in the embodiment based on the long-range directional diagram of actual measurement two-dimensional that directional diagram reconfigurable planar array antenna of digital code sign obtained under 3.5GHz, six different coding methods. For the encoding scheme P1, there are two main beams with an angle of ± 21 ° on the plane where Φ is 0 °, and the gain is 17.4dB, as shown in fig. 8 (a). For the coding scheme P2, there is a main beam with a gain of 17.8dB at θ ═ 0 °, as shown in fig. 8 (b). For the encoding scheme P4, there are two main beams with an angle of ± 44 ° on the plane where Φ is 90 °, and the gain is 14.7dB, as shown in fig. 8 (c). For the checkerboard coding scheme P4, there are two main beams with an angle of ± 52 ° on the plane where Φ is 62 °, and the gain is 13.3dB, as shown in fig. 8 (d). The test and simulation results on the plane where Φ is 0 ° are also substantially the same for the encoding schemes P5 and P6, as shown in fig. 8(e) and 8 (f).
Fig. 9 is an experimental result diagram of the directional diagram reconfigurable planar array antenna based on the digital coding representation in the embodiment of the present invention, in which the reflection amplitude changes with frequency under six different coding modes, and a sample with lower reflection loss can be obtained under the working frequency of 3.5 GHz.
Claims (8)
1. A directional diagram reconfigurable planar array antenna based on digital coding representation is characterized in that: the array antenna comprises a coaxial connector (1), a dielectric substrate (2), a metal ground (3) located on the lower surface of the dielectric substrate and a metal pattern (4) located on the upper surface of the dielectric substrate, wherein the metal pattern comprises a coding unit patch (41), a series-parallel hybrid feed network patch (42) and a two-way power divider patch (43), the series-parallel hybrid feed network patch comprises a first main feed line and a second main feed line which are connected in parallel, the series-parallel hybrid feed network patch is divided into 4 series feed lines along the axial direction of the first main feed line and the second main feed line, each series feed line is symmetrically distributed on two sides of the first main feed line or the second main feed line, two ends of each series feed line are respectively connected with one coding unit patch, and the first main feed line and the second main feed line are connected with the coaxial connector through the two-.
2. The digital code characterization based pattern reconfigurable planar array antenna of claim 1, wherein: the coding unit patch comprises a radiation metal patch and a switch line type phase shifter patch, the radiation metal patch is connected with the switch line type phase shifter through a first microstrip feeder line, and the switch line type phase shifter is connected with a first main feeder line or a second main feeder line through a second microstrip feeder line and a quarter-wavelength impedance matching line.
3. The digital code characterization based pattern reconfigurable planar array antenna of claim 2, wherein: the radiation metal patch is rectangular, a groove is arranged in the center of the adjacent side of the radiation metal patch and the switch line type phase shifter, and the first microstrip line is connected with the bottom of the groove.
4. The digital code characterization based pattern reconfigurable planar array antenna of claim 2, wherein: according to different bias voltages at two ends of the switch linear phase shifter patch, the coding unit patch presents two radiation states with a phase difference of 180 degrees and is used for simulating digital '0' and '1', each radiation coding unit independently realizes the '0' and '1' two digital states, and the planar array antenna can generate a plurality of coding patterns corresponding to a plurality of specific caliber phase distributions and further generate a plurality of radiation directional diagrams under the same frequency.
5. The digital code characterization based pattern reconfigurable planar array antenna of claim 2, wherein: the switch line type phase shifter comprises a delay phase channel, a reference phase channel, a first PIN diode D1, a second PIN diode D2, a third PIN diode D3 and a fourth PIN diode D4, wherein the delay phase channel and the reference phase channel are both U-shaped in length, and the delay phase channel is longer than the reference phase channel by lambdagA first microstrip feed line is connected with the delay phase channel and the reference phase channel through a first PIN diode D1 and a second PIN diode D2 respectively, and a second microstrip feed line is connected with the delay phase channel and the reference phase channel through a third PIN diode D3 and a fourth PIN diode D4 respectively; the first PIN diode D1, the second PIN diode D2, the third PIN diode D3 and the fourth PIN diode D4 are connected in series.
6. The digital code characterization based pattern reconfigurable planar array antenna of claim 5, wherein: when the first PIN diode D1 and the third PIN diode D3 are in an on state and the second PIN diode D2 and the fourth PIN diode D4 are in an off state, the microwave signal is transmitted from the delay phase path; when the first PIN diode D1 and the third PIN diode D3 are in an off state and the second PIN diode D2 and the fourth PIN diode D4 are in an on state, a microwave signal is transmitted from the reference phase path.
7. The digital code characterization based pattern reconfigurable planar array antenna of claim 1, wherein: the dielectric substrate material was F4B, dielectric constant 2.65, and loss tangent 0.001.
8. The digital coded representation-based pattern reconfigurable plane of claim 7An area array antenna, characterized in that: the distance between two adjacent coding unit patches along the axial direction of the first main feeder line and the second main feeder line is the guide wavelength lambdag。
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| CN111769359A (en) * | 2020-05-20 | 2020-10-13 | 东南大学 | THz super-surface antenna based on digital coding liquid crystal and wave beam reconstruction method thereof |
| CN112951347A (en) * | 2021-02-02 | 2021-06-11 | 北京大学 | Topological optimization method of super surface and topological super surface wave-absorbing structure |
| CN113131186A (en) * | 2021-03-26 | 2021-07-16 | 联想(北京)有限公司 | Ultra-wideband antenna, electronic equipment and signal receiving method |
| CN113363710A (en) * | 2021-04-23 | 2021-09-07 | 南京航空航天大学 | Light-operated reconfigurable microstrip pixel antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769359A (en) * | 2020-05-20 | 2020-10-13 | 东南大学 | THz super-surface antenna based on digital coding liquid crystal and wave beam reconstruction method thereof |
| CN111769359B (en) * | 2020-05-20 | 2023-09-29 | 东南大学 | Digital coding-based liquid crystal THz super-surface antenna and beam reconstruction method thereof |
| CN112951347A (en) * | 2021-02-02 | 2021-06-11 | 北京大学 | Topological optimization method of super surface and topological super surface wave-absorbing structure |
| CN112951347B (en) * | 2021-02-02 | 2023-09-26 | 北京大学 | Topological optimization method of super surface and topological super surface wave absorbing structure |
| CN113131186A (en) * | 2021-03-26 | 2021-07-16 | 联想(北京)有限公司 | Ultra-wideband antenna, electronic equipment and signal receiving method |
| CN113363710A (en) * | 2021-04-23 | 2021-09-07 | 南京航空航天大学 | Light-operated reconfigurable microstrip pixel antenna |
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