Single-polarized 2-bit bottom diode coding metasurface

Abstract

The utility model discloses a single-polarized 2-bit bottom diode coding metasurface, which is used for improving wider application of the single-polarized metasurface and comprises a metal patch layer, a top dielectric substrate, a metal ground layer, a bonding layer, a bottom dielectric substrate and a feed control layer which are sequentially distributed from top to bottom. The isolation between a direct current layer and an alternating current layer in the integral structure of the single-polarized 2-bit bottom diode coding metasurface is realized by using the metal patch layer, the upper dielectric substrate, the metal ground layer, the bonding layer, the feed control layer and the metalized via hole, and the PIN diode is innovatively placed at the bottom of the metasurface unit.

Description

Technical Field

[0001] The utility model belongs to the field of electromagnetic metasurfaces, and specifically relates to a single-polarization 2-bit bottom diode coding metasurface. Background Art

[0002] Electromagnetic metasurfaces are artificial materials with special structures and functions that can manipulate the propagation characteristics of electromagnetic waves. They are usually composed of a large number of subwavelength units, which are carefully designed in terms of geometry, size and arrangement to achieve functions such as modulation, reflection, transmission and absorption of electromagnetic waves.

[0003] The existing intelligent metasurfaces are all made by introducing active devices such as PIN diodes and varactors and graphene, VO 2 Metasurfaces are designed with adjustable materials such as diodes, and the working states of these active devices are controlled to obtain the dynamic response of the resulting metasurface and realize real-time coding switching. However, these diodes are designed on the top of the metasurface unit structure, which greatly limits the multifunctional application of the metasurface. Utility Model Content

[0004] In view of the above defects, the utility model provides a single-polarization 2-bit bottom diode coding metasurface to promote a wider application of the single-polarization metasurface, including a metal patch layer, a top dielectric substrate, a metal stratum, a bonding layer, a bottom dielectric substrate and a feed control layer distributed from top to bottom, the metal patch layer and the feed control layer are electrically connected, the metal patch layer is bonded to the metal stratum through the top dielectric substrate, the metal stratum is connected to the bottom dielectric substrate through the bonding layer, and the feed control layer is attached to the bottom of the bottom dielectric substrate;

[0005] The feed control layer includes a metal pad, five rectangular metal strips, two PIN diodes and three fan-shaped choke branches. The five rectangular metal strips are L1, L2, L3, L4 and Lh. The two PIN diodes are vertically installed between L1 and L4 and between L3 and L2 respectively. Lh is vertically connected between L1 and L2. The three fan-shaped choke branches are installed on one side of L3, L4 and Lh respectively.

[0006] Furthermore, the metal patch layer is a hexagonal metal patch.

[0007] Furthermore, the metal pad and the hexagonal metal patch are both provided with metallized vias, and the two metallized vias are coupled via a capacitor element.

[0008] Furthermore, the length of L1 is 2 mm, the length of L2 is 3 mm, the length of L3 is 8 mm, the length of L4 is 10 mm, and the length of Lh is 3 mm.

[0009] Furthermore, the metal patch layer is a RogersRO4725JXR dielectric substrate with a dielectric constant of 2.64 and a loss tangent of 0.0026.

[0010] Furthermore, the metal layer is a RogersRO4450F colloid medium with a dielectric constant of 3.7 and a loss tangent of 0.004.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The isolation between the DC layer and the AC layer in the overall structure of the single-polarization 2-bit bottom diode coded metasurface is achieved by using a metal patch layer, an upper dielectric substrate, a metal ground layer, an adhesive layer, a feed control layer, and metalized vias. The PIN diode is innovatively placed at the bottom of the metasurface unit.

[0013] At the same time, the working principle is simple. The amplitude and phase can be adjusted by only changing the working states of the two diodes, which greatly reduces the complexity of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a left view of the utility model.

[0016] Figure 3 It is a top view of the feed control layer in the utility model.

[0017] Figure 4 It is a top view of the metal patch layer in the utility model.

[0018] Figure 5 It is a reflection amplitude diagram of the utility model when the diode is in the on and off state.

[0019] Figure 6 It is the reflection phase diagram of the utility model when the diode is in the on and off state.

[0020] In the figure: 1. Metal patch layer; 2. Top dielectric substrate; 3. Metal ground layer; 4. Adhesive layer; 5. Bottom dielectric substrate; 6. Feed control layer; 7. Fan-shaped choke branch; 8. Metal pad. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The drawings provide embodiments of the device. However, the device can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example

[0024] like Figure 1-2 As shown, this embodiment provides a single-polarization 2-bit bottom diode coding metasurface, including a metal patch layer 1, a top dielectric substrate 2, a metal layer 3, a bonding layer 4, a bottom dielectric substrate 5 and a feed control layer 6, which are sequentially distributed from top to bottom. In detail, the metal patch layer 1 is a RogersRO4725JXR dielectric substrate with a dielectric constant of 2.64 and a loss tangent of 0.0026, and the metal layer 3 is a RogersRO4450F colloid medium with a dielectric constant of 3.7 and a loss tangent of 0.004.

[0025] The metal patch layer 1 is electrically connected to the feed control layer 6. The metal patch layer 1 is bonded to the metal layer 3 through the top dielectric substrate 2. The metal layer 3 is connected to the bottom dielectric substrate 5 through the adhesive layer 4. The feed control layer 6 is attached to the bottom of the bottom dielectric substrate 5. The metal patch layer 1 is a hexagonal metal patch, and as shown in FIG. Figure 4 As shown, the side lengths of the metal patch layer 1 are: X1 = 18 mm, X2 = 8 mm, X3 = 12 mm, P = 30 mm;

[0026] like Figure 3 As shown, the feed control layer 6 includes a metal pad 8, five rectangular metal strips, two PIN diodes and three fan-shaped choke branches 7. Metallized vias are provided at the metal pad 8 and the hexagonal metal patch. The two metallized vias are coupled by a capacitor element (the capacitor element can be a metal strip). The five rectangular metal strips are L1, L2, L3, L4 and Lh. The two PIN diodes are vertically installed between L1 and L4 and between L3 and L2, respectively. Lh is vertically connected between L1 and L2. The three fan-shaped choke branches 7 are respectively located on one side of L3, L4 and Lh and are connected through a bias line (the bias line is to reduce the influence of the bias line on the unit characteristics, and the bias line is loaded at a relatively weak patch field to achieve the effect of isolating RF and DC). Among them, the length of L1 is 2mm, the length of L2 is 3mm, the length of L3 is 8mm, the length of L4 is 10mm, and the length of Lh is 3mm;

[0027] Through this structure, the PIN diode has different responses to the incident electromagnetic wave under different bias voltages, including two states: the diode is applied with a positive bias voltage and is in a cut-off state; the diode is applied with a negative bias voltage and is in a conducting state, and the phase difference is generated by changing the current path by changing the area of ​​the metal patch between the two diodes;

[0028] Specifically, Figure 5 As shown, the reflection amplitude of the single-polarization 2-bit bottom diode coding metasurface in the diode on and off states is greater than -3.5dB in the four working states within the 5.2GHz-5.4GHz frequency band.

[0029] Specifically, Figure 6 As shown, the reflection phase of the single-polarized 2-bit bottom diode coding metasurface in the diode on and off states has a phase difference of 90°±10° between the reflection phases of the four working states within the 5.2GHz-5.4GHz frequency band, and the reflection phase is nearly parallel within the 5.2GHz-5.4GHz frequency band, which can realize the working characteristics of the single-polarized 2-bit metasurface and achieve excellent phase modulation.

[0030] Combining the above description and Figure 5-6 , the amplitude and phase characteristics of the single-polarization 2-bit bottom diode metasurface unit can be obtained, realizing the [0,2π] phase modulation of the incident electromagnetic wave.

[0031] It should be noted that the structure described in the utility model can be implemented in a variety of different forms and is not limited to the described embodiments. Any equivalent transformations made by ordinary technicians in this field using the contents of the utility model specification and drawings, or directly or indirectly applied to other related technical fields, such as the loading and unloading of other items, are included in the protection scope of the utility model.

Claims

1. A single-polarization 2-bit bottom diode coding metasurface, comprising a metal patch layer, a top dielectric substrate, a metal ground layer, a bonding layer, a bottom dielectric substrate and a feed control layer, which are sequentially distributed from top to bottom, wherein the metal patch layer is electrically connected to the feed control layer, and characterized in that: The metal patch layer is bonded to the metal stratum through the top dielectric substrate, the metal stratum is connected to the bottom dielectric substrate through the adhesive layer, and the feed control layer is attached to the bottom of the bottom dielectric substrate; The feed control layer includes a metal pad, five rectangular metal strips, two PIN diodes and three fan-shaped choke branches. The five rectangular metal strips are L1, L2, L3, L4 and Lh, the two PIN diodes are vertically installed between L1 and L4 and between L3 and L2, Lh is vertically connected between L1 and L2, and the three fan-shaped choke branches (7) are installed on one side of L3, L4 and Lh, respectively.

2. A single-polarization 2-bit bottom diode coded metasurface as claimed in claim 1, characterized in that: The metal patch layer is a hexagonal metal patch.

3. A single-polarization 2-bit bottom diode coded metasurface as claimed in claim 2, characterized in that: The metal pad and the hexagonal metal patch are both provided with metallized vias, and the two metallized vias are coupled via a capacitor element.

4. The single-polarization 2-bit bottom diode coded metasurface according to claim 1, characterized in that: The length of L1 is 2 mm, the length of L2 is 3 mm, the length of L3 is 8 mm, the length of L4 is 10 mm, and the length of Lh is 3 mm.

5. The single-polarization 2-bit bottom diode coded metasurface according to claim 1, characterized in that: The metal patch layer is a Rogers RO4725JXR dielectric substrate with a dielectric constant of 2.64 and a loss tangent of 0.0026.

6. The single-polarization 2-bit bottom diode coded metasurface according to claim 1, characterized in that: The metal formation is a Rogers RO4450F colloid medium with a dielectric constant of 3.7 and a loss tangent of 0.004.

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