Dual-bandwidth incident angle polarization-insensitive energy harvester based on metal complementary structure electromagnetic metasurface

Abstract

A dual-bandwidth incident angle polarization-insensitive energy collector based on a metal complementary structure electromagnetic metasurface relates to the field of wireless energy transmission and collection. The invention solves the problems of a large number of metasurface load resistors and a large collection resistance value of existing energy collection devices and low efficiency of existing energy collection devices in collecting dual-band, polarization-insensitive and wide incident angle energy. The invention provides a metal complementary structure of an energy collector, the metal complementary structure includes an electromagnetic energy collection unit, the electromagnetic energy collection unit is a completely rotationally centrally symmetrical structure, the completely rotationally centrally symmetrical structure includes a central opening located at the rotation center, n resonant slots and n connecting slots, n is an integer greater than 1, the n resonant slots are evenly distributed around the central opening, and each resonant slot is connected to the central opening through a connecting slot. The metal complementary structure is provided with n through holes, and the n through holes are evenly distributed around the central opening. The invention is suitable for wireless energy collection.

Description

Technical Field

[0001] The present invention relates to the field of wireless energy transmission and collection, and in particular to the field of wireless energy collection. Background Art

[0002] In recent years, the Internet of Things technology and wireless sensor network technology have been widely studied and applied, but this has also led to the problem of difficulty in powering equipment. Compared with traditional energy such as solar energy, thermal energy and electrical energy, due to the existence of various wireless devices and communication networks, radio frequency energy is always present in various indoor and outdoor environments. Wireless energy harvesting technology collects electromagnetic energy in the surrounding environment, and then uses rectification to convert voltage pulses into direct current for low-power devices such as wireless sensors. It solves the problem of difficult battery power maintenance, gets rid of the constraints of physical wiring, reduces battery pollution to the environment, and reduces electromagnetic interference in the environment. Metamaterials are artificially synthesized electromagnetic materials with negative dielectric constants, negative magnetic permeabilities and periodic structures. They control the generated electromagnetic field by changing the dielectric constants and magnetic permeabilities of the materials. The energy harvesting metasurface designed based on metamaterials can achieve low profiles, wide incident angles, polarization insensitivity and other characteristics through the design of periodic topological structures, and better collect electromagnetic energy in the environment.

[0003] The prior art, such as the patent document CN113314837A published on August 27, 2021, records a metasurface structure, which collects wireless energy through a polygon formed by resonant slots connected end to end. In the energy collection system, the collection resistor needs to be replaced with an energy convergence network with the same input impedance, and the input impedance of the energy convergence network is generally 50 ohms. The number of collection resistors in the patent document is large, and the collection resistor value is 450 ohms. The collection resistor value is too large, and a complex impedance matching network needs to be introduced, which is not conducive to the access of the subsequent rectifier circuit. This operation not only increases the design difficulty, but also makes it impossible to miniaturize the energy collection system, thus losing a certain practical value. Moreover, it can only work at a single frequency and cannot collect incident energy with a wide incident angle.

[0004] Patent document CN109787375A published on May 21, 2019 records a wireless energy harvesting device based on a metasurface structure, which reduces the resistance of the collection resistor, but this structure is not suitable for energy collection under different polarizations and multiple incident angles.

[0005] Patent document CN111682649A published on September 18, 2020 records a metasurface-based electromagnetic energy collector. The metasurface electromagnetic structure in the electromagnetic energy collector uses four rotationally symmetric patches to achieve efficient energy absorption under different polarization modes and incident angles, but it cannot achieve dual-frequency operation.

[0006] The document published in 2017, "A dual-band polarization-independent and wide-angle metasurface for electromagnetic power harvesting" (A dual-band polarization-independent and wide-angle metasurface for electromagnetic power harvesting) 2017 Sixth Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2017: 1-3. The document mentioned that the energy collection efficiency does not change much when the incident angle increases, but the maximum energy collection efficiency is only 91% and 84% at the dual frequencies. The energy collection efficiency gradually decreases with the increase of the incident angle, and the bandwidth is narrow. A slight shift in the resonant frequency will greatly reduce the energy collection efficiency at the original operating frequency. At large angles of incidence, the energy collection efficiency at the operating frequency can drop to less than 70%.

[0007] Based on the above analysis, the main problems currently faced by space wireless energy collection are: the existing energy collection metasurfaces have a large number of load resistors, and the collection resistors are too large, making it difficult to access the rectifier circuit. The existing energy collection devices have low efficiency in collecting dual-frequency, polarization-insensitive, and wide-angle energy. Summary of the invention

[0008] The present invention provides a metal complementary structure of an energy collector, the metal complementary structure includes an electromagnetic energy collection unit, the electromagnetic energy collection unit is a completely rotationally symmetrical structure, the completely rotationally symmetrical structure includes a central opening located at the rotation center, n resonance slots, n connection slots and n through holes, wherein n is an integer greater than 1. The problem of a large number of metasurface load resistors and excessively large collection resistance in existing energy collection devices and the problem of low energy efficiency in collecting dual-frequency, polarization-insensitive and wide-incident-angle energy in existing energy collection devices is solved.

[0009] To achieve the above object, the present invention provides the following solutions:

[0010] A metal complementary structure of an energy collector, the metal complementary structure comprising a metal plate and an electromagnetic energy collection unit, the electromagnetic energy collection unit being a completely rotationally centrally symmetrical structure, the completely rotationally centrally symmetrical structure comprising a central opening located at a rotation center, n resonance slots and n connection slots, wherein n is an integer greater than 1, the central opening is a regular polygon or a circle, the n resonance slots are evenly distributed around the central opening, each resonance slot is connected to the central opening via a connection slot, and the connection slot is located on a connection line between the center of the resonance slot and the center of the central opening;

[0011] The metal plate of the metal complementary structure is provided with n through holes, the n through holes are evenly distributed around the central opening, and the n through holes are alternately arranged with the n resonance slots, and the distance between each through hole and two adjacent resonance slots is equal.

[0012] Furthermore, in a preferred embodiment, the metal plate of the metal complementary structure is rectangular, and the length L of the rectangle is 23-24 mm, and the width P is 24-26 mm.

[0013] Furthermore, in a preferred embodiment, the above n is 4, and the completely rotationally centrally symmetrical structure is a Jerusalem cross structure.

[0014] Furthermore, in a preferred embodiment, the resonance slot is a rectangular opening or an elliptical opening, and the length n of the rectangular opening is 6 to 6.5 mm, and the width s is 2.3 to 2.7 mm.

[0015] Furthermore, in a preferred embodiment, the connection groove is a rectangular opening, the length w2 of the resonance groove is 1.5-2 mm, and the width w1 is 0.1-0.3 mm.

[0016] A dual-bandwidth incident angle polarization-insensitive energy collector based on an electromagnetic metasurface complementary structure, the energy collector comprising a metal complementary structure, a dielectric layer, a metal floor and n microwave devices;

[0017] The metal complementary structure covers the upper surface of the dielectric layer, and a gap t is left between the two. The metal floor covers the lower surface of the dielectric layer, and a gap is left between the two.

[0018] Furthermore, in a preferred embodiment, a gap t between the above-mentioned metal complementary structure and the metal floor is 4-5 mm.

[0019] Furthermore, in another preferred embodiment, the material of the dielectric layer is F4B or Rogers TMM 10i.

[0020] Furthermore, in a preferred embodiment, the microwave device is a resistor, a power divider or an SMA connector, and the resistance value of the resistor is 50 ohms.

[0021] A dual-bandwidth incident angle energy collection device based on an electromagnetic metasurface complementary structure, wherein the collection device is composed of an N*N array of the energy collectors described above, where N is an integer greater than 1.

[0022] Technical Effects

[0023] The purpose of the present invention is to solve the problems of large number of metasurface load resistors and excessively large collection resistance in existing energy collection devices and the low efficiency of existing energy collection devices in collecting dual-frequency, polarization-insensitive and wide-incident-angle energy.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. In the energy collection system, the collection resistor needs to be replaced by an energy convergence network with the same input impedance, and the input impedance of the energy convergence network is generally 50 ohms. There are many collection resistors in the existing energy collection system, and the collection resistor value is mostly 450 ohms. The collection resistor value is too large, and a complex impedance matching network needs to be introduced, which is not conducive to the access of the subsequent rectification circuit, increases the design difficulty, and also makes the energy collection system unable to be miniaturized, thus losing a certain practical value; and it can only work at a single frequency, and cannot collect incident energy with a wide incident angle. The dual-band wide incident angle polarization-insensitive energy collector based on the complementary structure of the electromagnetic metasurface described in the present invention can achieve the purpose of energy collection by only using resistors equal to the number of resonant slots and a rotational center symmetrical structure, and the collection resistor value is 50 ohms, and an extremely low return loss connection is achieved without an additional impedance matching network, which has the advantage of being conducive to the access of the subsequent rectification circuit, and can collect dual-frequency, different polarization angles, and wide incident angle energy at the same time.

[0026] 2. Existing energy collection device: A wireless energy collection device based on a metasurface structure reduces the collection resistance, but does not consider the energy collection under dual-frequency, different polarizations and multiple incident angles. It simply reduces the collection resistance, and does not consider other factors. The dual-frequency wide-incident-angle polarization-insensitive energy collector based on the complementary structure of an electromagnetic metasurface described in the present invention not only reduces the number of resistors and reduces the resistance, but also adopts a Jerusalem cross structure, so that the present invention can collect dual-frequency, polarization-insensitive and multi-incident-angle energy, and improves the collection efficiency of dual-frequency, polarization-insensitive and wide-incident-angle energy.

[0027] 3. The dual-band wide incident angle polarization-insensitive energy collector based on the complementary structure of the electromagnetic metasurface described in the present invention has an energy collection efficiency of dual-band normal incidence of between 95% and 96.4%, and can be maintained above 90% within the incident angle range of 0 to 45 degrees. When the incident angle is 60 degrees, the energy collection efficiency is still maintained above 77% under dual-band different polarizations.

[0028] 4. The dual-bandwidth incident angle polarization-insensitive energy collector based on the complementary structure of the electromagnetic metasurface described in the present invention has an energy collection efficiency of dual-band normal incidence higher than 94%. For example, when a completely rotationally symmetrical Jerusalem cross structure is adopted, the energy collection efficiency of dual-band normal incidence reaches between 95% and 96.4%, and can be maintained above 90% within the incident angle range of 0 to 45 degrees. When the incident angle is 60 degrees, the energy collection efficiency is still maintained above 77% under dual-band different polarizations.

[0029] The present invention is suitable for wireless energy harvesting. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a metal complementary structure of an energy collector described in embodiments 2 to 5, and a front view of the metal complementary structure when n is equal to 4.

[0031] Figure 2 This is a metal complementary structure of an energy collector described in Embodiment 3, and a front view of the metal complementary structure when n is equal to 2.

[0032] Figure 3 This is a metal complementary structure of an energy collector described in embodiment 3, and a front view of the metal complementary structure when n is equal to 5.

[0033] Figure 4 It is a side view of a dual-bandwidth incident angle polarization-insensitive energy collector based on an electromagnetic metasurface complementary structure as described in embodiments six to eight.

[0034] Figure 5 This is a rear view of a dual-bandwidth incident angle polarization-insensitive energy collector based on an electromagnetic metasurface complementary structure as described in embodiment six.

[0035] Figure 6 This is a front view of a dual-bandwidth incident angle energy collection device based on an electromagnetic metasurface complementary structure as described in Embodiment 10.

[0036] Figure 7 This is a diagram of the energy collection efficiency of TE polarization at different incident angles of a dual-bandwidth incident angle polarization-insensitive energy collector based on an electromagnetic metasurface complementary structure as described in embodiment eleven.

[0037] Figure 8 This is a diagram of the energy collection efficiency of TM polarization at different incident angles of a dual-bandwidth incident angle polarization-insensitive energy collector based on an electromagnetic metasurface complementary structure as described in embodiment eleven.

[0038] Among them: 1-metal complementary structure, 2-dielectric layer, 3-metal floor, 101-resonance slot, 102-resonance slot, 103-resonance slot, 104-resonance slot, 121-through hole, 122-through hole, 123-through hole, 124-through hole, 131-connecting slot, 132-connecting slot, 133-connecting slot, 134-connecting slot, 141-microwave device, 142-microwave device, 143-microwave device, 144-microwave device. DETAILED DESCRIPTION

[0039] The technical solution described in this application is described below in conjunction with the accompanying drawings:

[0040] Embodiment 1. A metal complementary structure of an energy collector described in this embodiment, the metal complementary structure includes a metal plate and an electromagnetic energy collection unit, the electromagnetic energy collection unit is a completely rotationally centrally symmetrical structure, the completely rotationally centrally symmetrical structure includes a central opening located at the rotation center, n resonance slots and n connection slots, wherein n is an integer greater than 1, the central opening is a regular polygon or a circle, the n resonance slots are evenly distributed around the central opening, each resonance slot is connected to the central opening via a connection slot, and the connection slot is located on the connection line between the center of the resonance slot and the center of the central opening;

[0041] The metal plate of the metal complementary structure is provided with n through holes, the n through holes are evenly distributed around the central opening, and the n through holes are alternately arranged with the n resonance slots, and the distance between each through hole and two adjacent resonance slots is equal.

[0042] The metal complementary structure of an energy collector described in this embodiment is an electromagnetic energy collection unit provided on a metal plate. The electromagnetic energy collection unit is a central symmetrical structure formed by opening through holes of a specific shape on the metal plate. These through holes form a resonant structure to collect electromagnetic energy in space. In practical applications, the n through holes are used to place microwave devices to realize the function of collecting and transmitting the collected electromagnetic energy.

[0043] Implementation method 2. See Figure 1 Description of this embodiment: This embodiment specifically describes the metal complementary structure 1 of an energy collector described in Embodiment 1. The metal plate of the metal complementary structure 1 is a rectangle, the length L of the rectangle is 23-24 mm, and the width P is 24-26 mm.

[0044] This embodiment further limits the metal complementary structure and specifically describes the shape and size of the metal complementary structure.

[0045] Implementation method 3. See Figure 1 , Figure 2and Figure 3 This embodiment is described. This embodiment is an example of n for an energy collector described in the first embodiment. When n is equal to 4, the completely rotationally symmetrical structure is a Jerusalem cross structure.

[0046] In the energy collector described in this embodiment, when n is 4, the metal complementary structure includes four resonant slots 101-104, a square opening located at the rotation center, four connecting slots 131-134 and four through holes 121-124, the distance between the centers of two adjacent through holes is 8.3 mm, the four through holes 121-124 connect four microwave devices 141-144, and the side length m of the square opening is 6-6.5 mm. This embodiment is an optimal embodiment, which maximizes the energy collection efficiency.

[0047] n is an integer greater than 1. In practical applications, for example, when n is equal to 2, see Figure 2 The metal complementary structure includes two resonant slots, a central opening located at the rotation center, two connecting slots and two through holes. For another example: when n is equal to 5, see Figure 3 As shown, there are five resonance slots, five connection slots and five through holes in the metal complementary structure, and the central opening is circular.

[0048] In practical applications, the value of n can be flexibly selected according to actual usage.

[0049] Implementation method 4. See Figure 1 This embodiment is described. This embodiment is a specific structural description of a resonant slot of an energy collector described in Embodiment 1. The resonant slot is a rectangular opening or an elliptical opening. The length n of the resonant slot is 6 to 6.5 mm, and the width s is 2.3 to 2.7 mm.

[0050] For example, when the resonant slot is elliptical, the major axis of the ellipse is 6-6.5 mm, and the minor axis is 2.3-2.7 mm.

[0051] The resonance slot described in this embodiment is a rectangular opening, which is an optimal embodiment and can maximize the energy collection efficiency.

[0052] Implementation method 5. See Figure 1 The present embodiment is described as follows: the present embodiment provides a specific structural description of the connection grooves 131 to 134 of an energy collector described in the first embodiment; the connection grooves are rectangular openings, and the length w2 of the rectangular openings is 1.5 to 2 mm, and the width w1 is 0.1 to 0.3 mm.

[0053] This embodiment provides a specific structural description of the connection slot. In practical application, according to the actual needs on site, the size of the resonance slot is increased while keeping the working frequency unchanged, and the size of the connection slot should be reduced accordingly.

[0054] Implementation method 6. See Figure 4 and Figure 5 The present embodiment is described as a dual-bandwidth incident angle polarization-insensitive energy collector based on an electromagnetic metasurface complementary structure. The energy collector comprises a metal complementary structure 1, a dielectric layer 2, a metal floor 3 and a microwave device; the metal complementary structure covers the upper surface of the dielectric layer with a gap therebetween, and the metal floor covers the lower surface of the dielectric layer with a gap therebetween.

[0055] In the energy collection system, the collection resistor needs to be replaced by an energy convergence network with the same input impedance, and the input impedance of the energy convergence network is generally 50 ohms. The existing energy collection system has a large number of collection resistors and a large resistance value. For example, in a structure recorded in a metasurface structure in the patent document mentioned in the background technology, there are 5 collection resistors, and the collection resistor resistance value is 450 ohms. It is necessary to introduce a complex impedance matching network, which is not conducive to the access of the subsequent rectification circuit, increases the design difficulty, and also makes the energy collection system unable to be miniaturized, thus losing a certain practical value; and it can only work at a single frequency, and cannot collect incident energy with a wide incident angle. A dual-band wide incident angle polarization-insensitive energy collector based on an electromagnetic metasurface complementary structure described in this embodiment can achieve the purpose of energy collection by only using a resistor equal to the number of resonant slots and a rotationally symmetrical structure, and the collection resistor resistance value is 50 ohms. No additional impedance matching network is required to achieve a connection with extremely low return loss, which has the advantage of being conducive to the access of the subsequent rectification circuit, and can collect dual-band and wide incident angle energy at the same time.

[0056] In the structure described in the patent document mentioned in the background technology, a wireless energy harvesting device based on a metasurface structure reduces the collection resistance, but does not consider the energy collection under dual-frequency, different polarizations and multiple incident angles. It simply reduces the collection resistance without considering other factors. The dual-frequency wide-incident-angle polarization-insensitive energy harvester based on the complementary structure of an electromagnetic metasurface described in this embodiment, while reducing the number of resistors and lowering the resistance, also adopts an improved Jerusalem cross structure, so that the present invention can collect dual-frequency, polarization-insensitive and multi-incident-angle energy, and improves the collection efficiency of dual-frequency, polarization-insensitive and wide-incident-angle energy.

[0057] Implementation method 7. See Figure 4Description of this embodiment: This embodiment specifically describes the gap between the metal complementary structure 1 and the metal floor 3 of the dual-bandwidth incident angle polarization-insensitive energy collector based on the electromagnetic metasurface complementary structure described in Embodiment 1, and the gap t between the metal complementary structure 1 and the metal floor 3 is 4 to 5 mm.

[0058] Implementation Method 8. See Figure 4 Description of this embodiment: This embodiment specifically describes the material of the dielectric layer 2 of the dual-bandwidth incident angle polarization-insensitive energy collector based on the electromagnetic metasurface complementary structure described in Embodiment 1, wherein the material is F4B or Rogers TMM 10i.

[0059] This embodiment further limits the material of the dielectric layer. In practical applications, F4B with a dielectric constant of 2.65, or F4B with other dielectric constants, or Rogers TMM 10i can be used. F4B and Rogers TMM 10i are metamaterials. The energy collection metasurface designed with metamaterials can achieve low profile, wide incident angle, polarization insensitivity and other characteristics, and better collect electromagnetic energy in the environment. When the dielectric constant changes, the size of the metal complementary structure also needs to change.

[0060] Implementation method nine. This implementation method specifically describes the microwave devices 141 to 144 of the dual-bandwidth incident angle polarization-insensitive energy collector based on the electromagnetic metasurface complementary structure described in implementation method one. The microwave device is a resistor, a power divider or an SMA connector, and the resistance value of the resistor is 50 ohms.

[0061] In this embodiment, when the microwave device is a resistor, a 50 ohm resistor is preferably used. This resistance value does not require an additional impedance matching network to achieve a connection with extremely low return loss, which is more conducive to the access of the subsequent rectifier circuit. Compared with the structure of selecting a commonly used resistance value in the prior art, the return loss is greatly reduced and the energy collection efficiency is improved while saving the application cost (no additional matching impedance is required).

[0062] Implementation method 10. See Figure 6 Describe this embodiment. This embodiment describes a dual-bandwidth incident angle energy collection device based on the complementary structure of an electromagnetic metasurface. The collection device is composed of an N*N array of dual-bandwidth incident angle polarization-insensitive energy collectors based on the complementary structure of an electromagnetic metasurface described in any one of the above-mentioned embodiments six to nine, where N is an integer greater than 1.

[0063] The dual-bandwidth incident angle energy collection device based on the complementary structure of the electromagnetic metasurface described in this embodiment is an arrangement method provided in an embodiment of the present invention. The dual-bandwidth incident angle polarization-insensitive energy collector based on the complementary structure of the electromagnetic metasurface provided in this embodiment is used to form an N*N array. The dual-bandwidth incident angle energy collection device based on the complementary structure of the electromagnetic metasurface can flexibly select the arrangement form according to actual needs on site.

[0064] Implementation method 11. See Figure 7 and Figure 8 This embodiment describes the dual-bandwidth incident angle polarization-insensitive energy collector based on the complementary structure of the electromagnetic metasurface described in Embodiment 6 for testing experiments. This case uses the full-wave electromagnetic simulation software CST for simulation, and sets the energy excitation port as the Floquet port. Under the condition of 0.5W energy incident, the energy collection efficiency at different frequencies under different incident angles and polarization angles is simulated. See Figure 7 As shown, the energy harvester has an energy collection efficiency of more than 90% in the range of 2.21 GHz to 2.53 GHz and 5.73 GHz to 6.08 GHz when the energy is normally incident; and has an energy collection efficiency of more than 80% in the range of 2.14 GHz to 2.64 GHz and 5.62 GHz to 6.17 GHz, and has the advantage of a wide width. When the TE polarization wave is normally incident, the energy collection efficiency of the dual frequencies is 96.3% and 95% respectively; when the TM polarization wave is normally incident, the energy collection efficiency of the dual frequencies of the collector is 96.4% and 95% respectively; the energy collection efficiency at dual frequencies and dual polarization incidence can be maintained above 90% between the incident angles of 0 and 45 degrees, and the energy collection efficiency is maintained above 77% when the incident angle is 60 degrees, which is consistent with the existing literature, that is, it works well at low frequencies, but the maximum energy collection efficiency is less than 90% at high frequencies and the energy collection efficiency is lower than 80% at non-normal incidence, the energy collection efficiency at normal incidence at dual frequencies is only between 91% and 84%, and the energy collection efficiency at the original working frequency is reduced to less than 70% at most when the incidence is at large angles, and the energy collection efficiency is significantly improved.

[0065] The energy harvester described in this embodiment has an energy collection efficiency of more than 90% in the range of 2.21 GHz to 2.53 GHz and 5.73 GHz to 6.08 GHz when the energy is normally incident; and an energy collection efficiency of more than 80% in the range of 2.14 GHz to 2.64 GHz and 5.62 GHz to 6.17 GHz.

[0066] The above description is only an embodiment of the present invention and is not limited to the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A metal complementary structure of an energy harvester, characterized in that: The metal complementary structure includes a metal plate and an electromagnetic energy collection unit, the electromagnetic energy collection unit is a completely rotationally centrally symmetrical structure, the completely rotationally centrally symmetrical structure includes a central opening located at the rotation center, n resonance slots and n connection slots, wherein n is 4, and the completely rotationally centrally symmetrical structure is a cross structure; the central opening is a regular polygon or a circle, the n resonance slots are evenly distributed around the central opening, each resonance slot is connected to the central opening via a connection slot, and the connection slot is located on the connection line between the center of the resonance slot and the center of the central opening; The metal plate of the metal complementary structure is provided with n through holes, the n through holes are evenly distributed around the central opening, and the n through holes are alternately arranged with the n resonance slots, and the distance between each through hole and two adjacent resonance slots is equal.

2. The metal complementary structure of an energy collector according to claim 1, characterized in that: The metal plate of the metal complementary structure is rectangular, the length L of the rectangle is 23-24 mm, and the width P is 24-26 mm.

3. The metal complementary structure of an energy collector according to claim 1, characterized in that: The resonance slot is a rectangular opening or an elliptical opening, and the length n of the resonance slot is 6 to 6.5 mm, and the width s is 2.3 to 2.7 mm.

4. The metal complementary structure of an energy collector according to claim 1, characterized in that: The connecting groove is a rectangular opening, the length w2 of the rectangular opening is 1.5-2 mm, and the width w1 is 0.1-0.3 mm.

5. A dual-bandwidth incident angle polarization-insensitive energy harvester based on an electromagnetic metasurface complementary structure, characterized in that: The energy collector comprises the metal complementary structure according to claim 1, a dielectric layer, a metal floor and n microwave devices; The metal complementary structure covers the upper surface of the dielectric layer, and the metal floor covers the lower surface of the dielectric layer, with a gap t left between the two; each through hole on the metal complementary structure is connected to a microwave device, one end of the microwave device is connected to the through hole, and the other end of the microwave device is connected to the metal floor.

6. The dual-bandwidth incident angle polarization-insensitive energy harvester based on the electromagnetic metasurface complementary structure according to claim 5 is characterized in that: The gap t between the metal complementary structure and the metal floor is 4-5 mm.

7. The dual-bandwidth incident angle polarization-insensitive energy harvester based on the electromagnetic metasurface complementary structure according to claim 5 is characterized in that: The material of the dielectric layer is F4B.

8. The dual-bandwidth incident angle polarization-insensitive energy harvester based on the electromagnetic metasurface complementary structure according to claim 5 is characterized in that: The microwave device is a resistor, a power divider or an SMA connector, and the resistance value of the resistor is 50 ohms.

9. A dual-bandwidth incident angle energy harvesting device based on an electromagnetic metasurface complementary structure, characterized in that: The collection device is composed of an N*N array of energy collectors according to any one of claims 5 to 8, where N is an integer greater than 1.

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