Search

KR-20260062342-A - RECONFIGURABLE SURFACE AND BEAM STEERING APPARATUS COMPRISING THE SAME

KR20260062342AKR 20260062342 AKR20260062342 AKR 20260062342AKR-20260062342-A

Abstract

The present embodiment is a reconstructable surface formed by arranging unit cells, wherein the unit cells are formed by stacking: a first layer (layer 1) including a reflective phase shifter; a second layer (layer 2) which is a common ground; a third layer (layer 3) which is a main patch that reflects radio waves; and a fourth layer (layer 3) which is an auxiliary patch, and the reconstructable surface is formed by arranging the unit cells.

Inventors

  • 유형석

Assignees

  • 한양대학교 산학협력단

Dates

Publication Date
20260507
Application Date
20241029

Claims (14)

  1. A reconstructable surface formed by arranging unit cells, wherein the unit cells are: A first layer (layer 1) including a reflective phase shifter; Layer 2, which is the common ground; Layer 3, which is the main patch reflecting radio waves, and A fourth layer (layer 3), which is an auxiliary patch, is formed by stacking, and The above-mentioned reconfigurable surface is a reconfigurable surface formed by arranging the above-mentioned unit cells.
  2. In paragraph 1, The above phase shifter is, A strip line extending to one side and the other, and A diode electrically connected to one side of the above strip line, and A reconfigurable surface comprising a DC blocking capacitor electrically connected to the other side of the above strip line.
  3. In paragraph 2, The second layer above includes via holes, and The above phase shifter is, A reconfigurable surface further comprising vias connected to the strip line and the main pattern through the via holes.
  4. In paragraph 2, The above first layer It further includes a bias strip connected to the above strip line to bias the phase shifter, and The above bias strip is a reconfigurable surface to which the RF blocking stub is connected.
  5. In paragraph 1, The above-mentioned first layer (layer 1), second layer (layer 2), third layer (layer 3) and fourth layer (layer 3) are reconfigurable surfaces stacked in order.
  6. In paragraph 1, The above unit cell is, A reconfigurable surface (n: natural number, k: natural number) in which n × k items are regularly arranged to form the reconfigurable surface.
  7. In paragraph 1, The above reconfigurable surface is a reconfigurable surface operating in the N257 band.
  8. A beam steering device comprising a reconstructable surface formed by arranging unit cells, wherein the unit cells are: A first layer (layer 1) including a reflective phase shifter; Layer 2, which is the common ground; Layer 3, which is the main patch reflecting radio waves, and A fourth layer (layer 3), which is an auxiliary patch, is formed by stacking, and The above-mentioned reconfigurable surface is a beam steering device formed by arranging the above-mentioned unit cells.
  9. In paragraph 8, The above phase shifter is, A strip line extending to one side and the other, and A diode electrically connected to one side of the above strip line, and A beam steering device comprising a DC blocking capacitor electrically connected to the other side of the above strip line.
  10. In Paragraph 9, The second layer above includes via holes, and The above phase shifter is, A beam steering device further comprising vias connected to the strip line and the main pattern through the via holes.
  11. In Paragraph 9, The above first layer It further includes a bias strip connected to the above strip line to bias the phase shifter, and The above bias strip is a beam steering device to which the above RF blocking stub is connected.
  12. In paragraph 8, The above-mentioned first layer (layer 1), second layer (layer 2), third layer (layer 3) and fourth layer (layer 3) are a beam steering device stacked in order.
  13. In paragraph 8, The above unit cell is, A beam steering device (n: natural number, k: natural number) in which n × k are regularly arranged to form the reconfigurable surface.
  14. In paragraph 8, The above-mentioned reconfigurable surface is a beam steering device operating in the N257 band.

Description

Reconfigurable surface and beam steering apparatus comprising the same The present disclosure relates to a reconfigurable surface and a beam steering device comprising the same. Reconfigurable surfaces are a technology that utilizes metasurfaces to dynamically manipulate electromagnetic waves, and they are attracting attention in the telecommunications field as they can enhance wireless communication and signal propagation. Reconfigurable surfaces include surfaces equipped with numerous reconfigurable elements capable of altering the characteristics of incident electromagnetic waves. By adjusting the phase, amplitude, and polarization of radio waves, reconfigurable surfaces can effectively steer and focus signals, thereby improving communication links and signal coverage. Reconfigurable surfaces are being utilized in various applications such as 5G, wireless power transfer (WPT), navigation, and Wi-Fi. FIG. 1 is a diagram illustrating an overview of a unit cell according to the present embodiment. FIG. 2(a) is a schematic diagram illustrating a phase shifter, and FIG. 2(b) is a diagram illustrating the s-parameters for the frequency of the strip line before the phase shifter is combined with the antenna element. Figure 3(a) is a diagram showing reflection loss with respect to frequency, Figure 3(b) is a diagram showing phase response with respect to frequency, and Figure 3(c) is a diagram showing phase response when the capacitance of the diode is changed while maintaining the values of other parameters. Figure 4 is a diagram showing the surface current of the phase shifter for both ON and OFF conditions of the diode. FIGS. 5(a) and FIGS. 5(b) are front and rear views of a full array of a reconfigurable surface including a complete bias network with pin headers. FIGS. 6(a) to 6(e) are drawings illustrating the conversion from a near field to a far field for 0°, 20°, 40°, 60°, and 80°, respectively, on the reconfigurable surface of the present embodiment at 28 GHz, and FIGS. 6(f) to 6(j) illustrate simulated three-dimensional (3D) patterns for each reconfigurable surface pattern with gain characteristics of 21.03, 21.87, 20.59, 17.99, and 15.17 dBi. FIGS. 7(a) to 7(g) are drawings showing near-far beam scanning at frequencies of 25 GHz, 26 GHz, 27 GHz, 28 GHz, 29 GHz, 30 GHz, and 31 GHz, respectively. FIGS. 8(a) to 8(c) are diagrams showing the normalized electric field (E field) for far-field transformation at frequencies of 27, 28, and 29 GHz, respectively. FIG. 9(a) is a diagram showing a simulation scenario, and FIG. 9(b) to FIG. 9(f) are diagrams illustrating examples of steering a near-field in a desired direction. FIG. 10(a) is a drawing showing the front of a reconfigurable surface, FIG. 10(b) is a drawing showing the rear of the front of a reconfigurable surface, and FIG. 10(c) is a drawing showing an enlarged portion of the rear of a reconfigurable surface. FIG. 11(a) is a drawing showing the front of a control circuit prototype, and FIG. 11(b) is a drawing showing the rear of a control circuit prototype. Figure 12 is a diagram illustrating the configuration of the measuring instrument used for measurement. Figure 13 is a diagram showing measurement data obtained from testbed measurements for a given configuration. FIGS. 14(a) to 14(c) illustrate normalized radiation patterns measured at 27, 28, and 29 GHz, respectively, for scanning angles of 40°, 60°, and 80°. The present embodiment is described below with reference to the attached drawings. FIG. 1 is a drawing illustrating an overview of a unit cell according to the present embodiment. Referring to FIG. 1, the unit cell (100) of the present embodiment is formed by stacking a first layer (Layer 1) including a reflective phase shifter, a second layer (Layer 2) which is a common ground, a third layer (Layer 3) including a main patch, and a fourth layer (Layer 4) including an auxiliary patch. The illustrated unit cells (100) can be regularly arranged to form a reconfigurable surface and operate as a beam steering apparatus. In one embodiment, the first layer (Layer 1), the second layer (Layer 2), the third layer (Layer 3), and the fourth layer (Layer 4) may be stacked in order. The unit cell includes a main patch and an auxiliary patch formed on the third layer (Layer 3) and the fourth layer (Layer 4), and a reflective phase shifter (100) located on the first layer (Layer 1). The unit cell of this embodiment is formed on a four-layer substrate. The first layer (Layer 1) and the third layer (Layer 3) are formed from RO4350B (εr = 3.66, tan δ = 0.004) material with thicknesses of 0.1 mm and 0.51 mm, respectively. Additionally, the second layer (Layer 2) is RO4450F (εr = 3.52, tan δ = 0.004), which is a prepreg material (pre-impregnated material) for carbon fiber composite materials in the form of a sheet in which resin and carbon fiber are impregnated in a predetermined ratio with a thickness of 0.1 mm. The fourth layer (Layer 4) can be formed by lami