Built-in energy transmission channel dual-band energy acquisition metasurface antenna

Abstract

The invention relates to a metamaterial antenna or an antenna in the field of energy collection, in particular to a built-in energy transmission channel dual-band energy collection antenna which can be applied to 2.4 GHz and 5.8 GHz frequency bands of a WLAN (Wireless Local Area Network). The upper surface and the lower surface use metal patches, the upper surface is a metasurface symmetrical unit comprising antenna acquisition and energy acquisition, and a 100-ohm acquisition resistor is used between the upper transmission line and the lower transmission line. According to the invention, two targets of WLAN dual-band, radio frequency energy collection and system energy collection on the same surface are realized, the manufacturing process of the collection system is simplified, and the bandwidth is expanded and the gain of the antenna is improved through the improved design of the shape of the metasurface.

Description

Technical Field

[0001] The present invention relates to a metamaterial antenna or an antenna in the field of energy collection, and in particular to a dual-band energy collection antenna with built-in energy transmission channels in the 2.4 GHz and 5.8 GHz frequency bands that can be applied to WLAN wireless local area networks. Background Art

[0002] We have witnessed the rapid development of 5G technology and related supporting technologies, which have transformed the Internet of Everything from a theoretical possibility to a practical reality. The key part of this transformation lies in low-power miniaturized terminal devices and wireless sensor network nodes distributed around the world, which play a vital role in connecting various devices and systems. However, a pressing issue that needs to be solved is how these tens of thousands of devices can operate continuously and stably. Currently, the two main power supply schemes are chemical batteries with limited lifespans and wired power supply. However, these methods have some limitations, such as frequent battery replacement and initial investment costs. In this context, ambient energy harvesting technology has become a potential solution. This technology allows devices to actively or passively obtain energy from the surrounding environment for continuous power supply, which can not only serve as a battery substitute, but also significantly improve energy efficiency and device life. In order to achieve effective ambient energy harvesting, miniaturized antennas need to be designed to be able to capture wireless energy in the surrounding environment. These antennas also need to support multiple frequency bands to ensure that they can adapt to the diversity of wireless signals in different environments. At the same time, considering factors such as impedance matching and manufacturing process, energy transmission channels need to be built-in during the energy harvesting process to ensure that the captured energy can be effectively used to power the device. The combination of these innovations and technological advances offers exciting prospects for achieving continuously powered, low-power devices, which will not only drive the development of the Internet of Things, but also help reduce reliance on traditional batteries, reduce environmental impact, and reduce equipment maintenance costs. Currently, the requirements for acquisition equipment mainly include two aspects. First, the acquisition system should be as simple as possible to reduce the impact on the environment and help reduce subsequent maintenance costs. Second, the acquisition efficiency should be high, because only an efficient acquisition system can achieve the miniaturization of equipment. Summary of the invention

[0003] The present invention provides a dual-band energy harvesting metasurface antenna with built-in energy transmission channels in the 2.4 GHz and 5.8 GHz frequency bands for WLAN wireless local area networks. The main technical issues include simplification, multi-frequency, miniaturization and high-performance technical indicators.

[0004] In order to solve the above technical problems, the following technical solutions are proposed:

[0005] A dual-band energy harvesting metasurface antenna with a built-in energy transmission channel, wherein the metasurface unit comprises a dielectric plate, a ground plane, a patch antenna and a transmission line.

[0006] All patch parts are located on the same surface of the dielectric plate. The dielectric plate is a Rogers RT5880 substrate, the length of the metasurface unit dielectric plate is 30 mm, the width of the dielectric plate is 30 mm, and the thickness of the dielectric plate is 3 mm.

[0007] The ground plane is located at the bottom of the dielectric plate opposite to the patch antenna.

[0008] Furthermore, the patch antenna is divided into three parts: upper, middle and lower. The upper and lower parts are transmission lines for convenient energy collection. Energy collection is performed by using a collection resistor equivalent collection circuit between the upper and lower transmission lines. This step of the transmission line simplifies the collection system, simplifies the manufacturing process, and is also conducive to the subsequent maintenance of the system.

[0009] The electromagnetic resonance between the notch antenna and the transmission line in the middle is the main way for the antenna to collect energy. The collection antenna in the middle is a rectangular shape with a rectangular block of appropriate size cut out from each of its four corners, and three notches formed in the middle. These notches form electromagnetic resonance between the collection antennas and between the collection antennas and the transmission line, thus becoming the main source of energy collection.

[0010] Compared with the prior art, the present invention has the following significant advantages and beneficial effects:

[0011] (1) The dual frequency band of the present invention can be used to absorb the two most commonly used WLAN numbers, 2.4 GHz and 5.8 GHz.

[0012] (2) The built-in energy transmission channel of the present invention can simplify the process difficulty. Energy collection can be directly connected to the load on the transmission line, which is simpler and more reliable than the existing technology.

[0013] (3) The present invention adopts metamaterial technology, so that the design of the antenna is not affected by the size of the antenna to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the antenna of the present invention.

[0015] Figure 2 It is a model parameter diagram of the antenna of the present invention.

[0016] Figure 3 Graph showing the return loss of the antenna of the present invention.

[0017] Figure 4 Graph showing the energy absorption efficiency of the antenna of the present invention.

[0018] Figure 5 It is the return loss diagram of a single unit of the antenna of the present invention.

[0019] Figure 6 It is the return loss diagram of the 2×2 unit of the antenna of the present invention. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical solution and purpose of the present invention and to demonstrate the advantages of the present invention, the present invention will be explained in more detail below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, the dual-band energy harvesting metasurface antenna with built-in energy transmission channels in this embodiment includes a dielectric substrate 5, a ground plane 4 located below the dielectric substrate, an upper transmission line 1, a lower transmission line 2, and a harvesting antenna 3 in the middle. All patches and ground planes are located on both sides of the dielectric substrate.

[0022] In this embodiment, the thickness of the entire dielectric substrate 5 is 3 mm. Figure 2 As shown, the dielectric substrate 5 is 30mm long and 30mm wide. The width of the transmission line is 2.2mm in the middle and 8.2mm on both sides. The distance between the central collecting antenna and the left and right is 0.75mm. The four corners of the rectangle of 28.5mm×25.2mm are subtracted from the rectangular blocks of 5.65mm×6mm, and three rectangular blocks are dug out from the inside. The left groove is 0.75mm away from the left boundary and 3.mm away from the upper boundary. The left groove is 4.5mm wide and 7mm long, and the right groove is symmetrical with it. The left boundary of the middle groove is 1.5mm away from the left groove and 3.1mm away from the upper boundary. The length is 19mm and the width is 15mm.

[0023] In this example, energy is harvested through the resistance between the transmission lines, the resistance is set to 100 ohms, the port used is the floquet port, and the surrounding boundary conditions are set to periodic arrangement. By simulating the metasurface unit, the return loss of the antenna can be obtained, and the corresponding energy harvesting efficiency can be calculated by the return loss.

[0024] Figure 3 This is the return loss diagram of the antenna of the present invention, with the lowest points at 2.4 GHz (-34.75 dB) and 5.8 GHz (-15.38 dB), respectively, meeting the energy collection requirements in the WLAN frequency band.

[0025] Figure 4 This is a graph of energy absorption efficiency of the antenna of the present invention. The collection efficiency of a 150 MHz bandwidth near 2.4 GHz is higher than 80%, and the collection efficiency of a 180 MHz bandwidth near 5.8 GHz is higher than 80%.

[0026] Figure 5is a return loss diagram of a single unit of the antenna of the present invention, Figure 6 This is a return loss diagram of the 2×2 unit of the antenna of the present invention, and the return loss in the actual application simulation can be seen.

Claims

1. A novel dual-band energy harvesting metasurface antenna with built-in energy transmission channels, characterized by: The patches are located on two surfaces of the substrate, the collection antenna and the transmission belt are located on the upper surface of the substrate, and the patch used for reflection is located on the lower surface of the substrate.

2. According to claim 1, a novel dual-band energy harvesting metasurface antenna with built-in energy transmission channel is characterized by: The patch on the upper surface is symmetrical, including two upper and lower transmission lines and a collection antenna in the middle. There is also a 100-ohm resistor between the upper and lower transmission lines, which is used to connect the energy collection system during the energy collection process.

3. According to claim 2, the novel dual-band energy harvesting metasurface antenna with built-in energy transmission channel is characterized by: There is a patch with a width of 30 mm and a length of 30 mm at the bottom of the dielectric plate, which is used to reflect the RF energy into the dielectric.

4. According to claim 3, the novel dual-band energy harvesting metasurface antenna with built-in energy transmission channel is characterized by: The shape of the collection antenna is rectangular, with a size of 28.5mm×25.2mm. A 5.65mm×6mm rectangular block is subtracted from each of the four corners, and three rectangular blocks are dug out inside. The left groove is 0.75mm away from the left boundary and 3.1mm away from the upper boundary. The width of the left groove is 4.5mm and the length is 7mm. The right groove is symmetrical with it. The left boundary of the middle groove is 1.5mm away from the left groove and 3.1mm away from the upper boundary. The length is 19mm and the width is 15mm.

5. According to claim 4, the novel dual-band energy harvesting metasurface antenna with built-in energy transmission channel is characterized by: Copper metal layers are used on both the upper and lower surfaces, and the dielectric board uses a Rogers RT5880 dielectric board with a dielectric constant of 2.2.

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