Dual-frequency microstrip antenna for RF collection
By designing the convex and concave structures of the dual-frequency microstrip antenna, the existing microstrip antenna has solved the problems of large size, narrow bandwidth and insufficient gain in short-distance communication, and efficient RF energy collection and bandwidth expansion are achieved.
Patent Information
- Application Number
- CN202411700110.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-02-18
AI Technical Summary
Existing microstrip antennas are large in size, limited bandwidth and insufficient gain in short-distance communication, making it difficult to meet the needs of efficient RF energy collection.
A dual-frequency microstrip antenna is designed to form a structure of multiple convex and depressions by etching radiation patches on the dielectric substrate, and optimize the shape and size of the antenna to improve RF acquisition performance and expand bandwidth.
Achieve smaller space occupation, improve RF signal capture capability in short-distance communication, has two working bands consistent with the WiFi band, with three-dimensional gains of 4.82dBi and 5.48dBi respectively, which enhances the collection capability of low input power and Conversion efficiency.
Smart Images
Figure CN119481683A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of communication antennas, and in particular relates to a dual-frequency microstrip antenna for RF collection. Background Art
[0002] The wireless energy recovery module of wireless power carrying communication (SWIPT) consists of the following components: receiver antenna or antenna array, matching network, radio frequency to direct current (RF-DC) converter or rectifier, power management unit (PMU) and energy storage unit (ESU). When the energy storage unit is successfully charged, the storage unit (usually a rechargeable battery or supercapacitor) will provide power to the sensors and low duty cycle communication transceiver of the central processing unit (CPU). The schematic diagram of the module is shown in Figure 1 As shown. The function of the receiving antenna is to capture the surrounding RF energy and power the integrated embedded system; the rectifier circuit effectively converts the input RF power into DC output power. The antenna collects the RF signal, and then the rectifier circuit extracts the power of these signals and converts them into DC voltage, so a high-efficiency antenna is required to effectively transmit wireless power.
[0003] RF energy transmission and harvesting technology, which converts received RF signals into electricity, has recently emerged as an alternative method to power the next generation of wireless networks. This technology is expected to solve the problem of powering energy-constrained wireless networks. On energy-constrained wireless networks, the limited lifetime largely limits the network performance. In contrast, RF energy harvesting networks (RF-EHNs) have sustainable power supply from the radio environment. Antennas, as key elements of SWIPT energy harvesting systems, are used to capture radiated RF energy and extract maximum power. The goal is to produce a large DC output voltage so that it can be converted into electrical energy that can be used to power sensors with maximum efficiency.
[0004] In the prior art, there are the following problems:
[0005] Microstrip antennas are used in short-distance communications and need to further reduce size, expand bandwidth, and increase gain. Summary of the invention
[0006] The present invention provides a dual-frequency microstrip antenna for RF collection, which is used to solve the technical problem that the microstrip antenna in the prior art is applied to short-distance communication and needs to further reduce the size, expand the bandwidth and improve the gain.
[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions:
[0008] A dual-band microstrip antenna for RF collection includes: a dielectric substrate having a first surface and a second surface opposite to each other, and a radiation patch having a plurality of convex portions, wherein concave portions are formed between the plurality of convex portions.
[0009] Furthermore, there are four convex portions, which are respectively located at the four corners of the radiation patch, and the concave portion includes a first concave portion and a second concave portion.
[0010] Furthermore, a third recessed portion is provided at the center of the radiation patch, and the third recessed portion is a circular hole.
[0011] Furthermore, the width of the two side edges of the first recessed portion is d, and d satisfies the relationship: 1≤d≤2mm; the width of the two side edges of the second recessed portion is a, and a satisfies the relationship: 4≤a≤6mm; the gap between the bottom of the first recessed portion and the second recessed portion is n, and n satisfies the relationship: 0.8≤n≤1.2mm; the gap between the bottom of the second recessed portion and the outer surface of the convex portion is b, and b satisfies the relationship: 0.8≤b≤1.2mm.
[0012] Furthermore, the radius of the third recessed portion is R0, and R0 satisfies the relationship: 0.8≤R0≤1.2mm.
[0013] Furthermore, the gaps between the plurality of protrusions are L0 and W0, L0 satisfies the relationship: 11≤L0≤14mm, and W0 satisfies the relationship: 28≤W0≤31mm.
[0014] Furthermore, the side lengths of the dielectric substrate are L1 and W1, L1 satisfies the relationship: 19≤L1≤21mm, and W1 satisfies the relationship: 50≤W1≤53mm.
[0015] Furthermore, it works in the 2.33~2.43GHz frequency band and the 4.92~5.42GHz frequency band
[0016] The invention provides a dual-frequency microstrip antenna for RF collection, which improves RF collection performance, expands antenna bandwidth and changes the central frequency band range of the antenna by arranging a plurality of convex parts and a plurality of concave parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1A schematic diagram of the structure of a dual-frequency microstrip antenna for RF collection provided by an embodiment of the present invention;
[0019] Figure 2 A top view of a dual-band microstrip antenna for RF collection provided by an embodiment of the present invention;
[0020] Figure 3 A frequency curve diagram of a dual-band microstrip antenna for RF collection provided in an experimental example of the present invention;
[0021] Figure 4 A 2.45 GHz three-dimensional gain diagram of a dual-band microstrip antenna for RF collection provided in an experimental example of the present invention;
[0022] Figure 5 This is a 5 GHz three-dimensional gain diagram of a dual-band microstrip antenna for RF collection provided in an experimental example of the present invention.
[0023] In the figure: 1- dielectric substrate; 2- convex portion; 3- first concave portion; 4- second concave portion; 5- third concave portion. DETAILED DESCRIPTION
[0024] The embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0025] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be welding, bolt connection, or riveting; it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0028] Example:
[0029] Please refer to Figures 1 to 5 As shown, a dual-band microstrip antenna for RF collection includes: a dielectric substrate 1 and a radiation patch. The dielectric substrate 1 has a first surface and a second surface relative to each other; the radiation patch has a plurality of convex portions 2, and a concave portion is formed between the plurality of convex portions 2. The dielectric substrate 1 is etched on the first surface to form a radiation patch, and the concave portion is in the shape of a "convex" character. The "convex"-shaped antenna structure is processed according to a tolerance of -0.1~+0.1mm. Excessive deviation will cause the antenna resonant frequency band to shift, affecting the antenna bandwidth and gain enhancement effect. Since the antenna structure may be applicable to various occasions, it will be directly attacked by storms, ice and snow, dust and solar radiation in nature, resulting in reduced antenna accuracy, shortened life and poor working reliability. Therefore, the antenna cover can be installed according to the situation to make the antenna system work more stable and reliable, while reducing the wear, corrosion and aging of the antenna and extending its service life.
[0030] Further, in some implementations of this embodiment, Figure 1 and Figure 2 As shown, there are four convex portions 2, which are respectively located at the four corners of the radiation patch, and the concave portion includes a first concave portion 3 and a second concave portion 4. By continuously optimizing and adjusting the size and position of the notch, the antenna bandwidth is expanded and the center frequency band range of the antenna is changed.
[0031] Further, in some implementations of this embodiment, Figure 1 and Figure 2 As shown, a third recessed portion 5 is provided at the center of the radiation patch, and the third recessed portion 5 is a circular hole. The antenna structure adopts a composite method of adding a notch and embedding a circular hole, in order to improve the bandwidth and three-dimensional gain of the antenna.
[0032] Further, in some implementations of this embodiment, Figure 1 and Figure 2As shown, the width of the two side edges of the first recessed portion 3 is d, and d satisfies the relationship: 1≤d≤2mm; the width of the two side edges of the second recessed portion 4 is a, and a satisfies the relationship: 4≤a≤6mm; the gap between the bottom of the first recessed portion 3 and the second recessed portion 4 is n, and n satisfies the relationship: 0.8≤n≤1.2mm; the gap between the bottom of the second recessed portion 4 and the outer surface of the convex portion 2 is b, and b satisfies the relationship: 0.8≤b≤1.2mm.
[0033] Further, in some implementations of this embodiment, Figure 1 and Figure 2 As shown, the radius of the third recessed portion 5 is R0, and R0 satisfies the relationship: 0.8≤R0≤1.2 mm.
[0034] Furthermore, in some implementations of this embodiment, the gaps between the plurality of protrusions 2 are L0 and W0, L0 satisfies the relationship: 11≤L0≤14 mm, and W0 satisfies the relationship: 28≤W0≤31 mm.
[0035] Further, in some implementations of this embodiment, Figure 1 and Figure 2 As shown, the side lengths of the dielectric substrate 1 are L1 and W1, L1 satisfies the relationship: 19≤L1≤21mm, and W1 satisfies the relationship: 50≤W1≤53mm.
[0036] Further, in some implementations of this embodiment, Figure 3 As shown, it operates in the 2.33~2.43GHz frequency band and the 4.92~5.42GHz frequency band.
[0037] Experimental example:
[0038] The present invention proposes a dual-band microstrip antenna for RF collection, which has a shape as follows: Figure 1 The specific dimensions are shown in Table 1.
[0039] Table 1 Parameter size table
[0040]
[0041] The thickness of the dielectric substrate 1 is 1.6 mm, and the thickness of the etched copper is 0.035 mm. The S parameter curve of the structure can be directly obtained by simulation in HFSS software, such as Figure 3 As shown, the far-field radiation simulation is performed. By radiating the three-dimensional spherical surface and setting the far-field radiation conditions for simulation, the three-dimensional gain of the antenna in the two frequency bands can be obtained, as shown in Figure 4 and Figure 5As shown in the graph, the antenna has two operating frequency bands, which coincide with the WiFi frequency bands. The three-dimensional gains are 4.82dBi and 5.48dBi respectively. The high gain can effectively increase the collection capability of low input power and improve the conversion efficiency. In addition, the overall size of the antenna is relatively small, which can effectively reduce the occupied space of the RF energy collection equipment and better capture the RF signals in short-distance communications.
[0042] In summary, when using a dual-band microstrip antenna for RF collection, a smaller space occupancy can be achieved, and the RF signal in short-distance communication can be better captured. At the same time, the antenna has two working frequency bands, which coincide with the WiFi frequency bands, and their three-dimensional gains are 4.82dBi and 5.48dBi respectively. The high gain can effectively increase the collection capability of low input power and improve the conversion efficiency.
[0043] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims
1. A dual-band microstrip antenna for RF collection, characterized in that: include: A dielectric substrate (1) having a first surface and a second surface opposite to each other; A radiation patch is connected to the dielectric substrate (1), wherein the radiation patch has a plurality of convex portions (2), and recessed portions are formed between the plurality of convex portions (2).
2. A dual-band microstrip antenna for RF collection according to claim 1, characterized in that: Specifically, there are four convex portions (2), which are respectively located at the four corners of the radiation patch, and the concave portion comprises a first concave portion (3) and a second concave portion (4).
3. A dual-band microstrip antenna for RF collection according to claim 2, characterized in that: A third recessed portion (5) is provided at the centre of the radiation patch, and the third recessed portion (5) is a circular hole.
4. A dual-band microstrip antenna for RF collection according to claim 3, characterized in that: The width of the two side edges of the first recessed portion (3) is d, and d satisfies the relationship: 1≤d≤2mm; The width of the two side edges of the second recessed portion (4) is a, and a satisfies the relationship: 4≤a≤6mm; The gap between the bottom of the first recessed portion (3) and the bottom of the second recessed portion (4) is n, and n satisfies the relationship: 0.8≤n≤1.2mm; The gap between the bottom of the second recessed portion (4) and the outer surface of the convex portion (2) is b, and b satisfies the relationship: 0.8≤b≤1.2 mm.
5. A dual-band microstrip antenna for RF collection according to claim 3, characterized in that: The radius of the third recessed portion (5) is R0, and R0 satisfies the relationship: 0.8≤R0≤1.2 mm.
6. A dual-band microstrip antenna for RF collection according to claim 3, characterized in that: The gaps between the plurality of protrusions (2) are L0 and W0, L0 satisfies the relationship: 11≤L0≤14 mm, and W0 satisfies the relationship: 28≤W0≤31 mm.
7. A dual-band microstrip antenna for RF collection according to claim 3, characterized in that: The side lengths of the dielectric substrate (1) are L1 and W1, L1 satisfies the relationship: 19≤L1≤21 mm, and W1 satisfies the relationship: 50≤W1≤53 mm.
8. A dual-band microstrip antenna for RF collection according to any one of claims 1 to 7, characterized in that: It operates in 2.33~2.43GHz and 4.92~5.42GHz frequency bands.