CN114649683B - Double-frequency ultra-wideband flexible environment energy collector - Google Patents
Double-frequency ultra-wideband flexible environment energy collector Download PDFInfo
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- CN114649683B CN114649683B CN202210338387.6A CN202210338387A CN114649683B CN 114649683 B CN114649683 B CN 114649683B CN 202210338387 A CN202210338387 A CN 202210338387A CN 114649683 B CN114649683 B CN 114649683B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/273—Adaptation for carrying or wearing by persons or animals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/25—Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/001—Energy harvesting or scavenging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
- H02J50/27—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of receiving antennas, e.g. rectennas
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention relates to a double-frequency ultra-wideband flexible environment energy collector, which comprises: the antenna comprises a flexible substrate, an antenna unit arranged on the flexible substrate, a metal ground unit arranged on the lower surface of the flexible substrate and a rectifying circuit; the antenna unit comprises an antenna radiation unit, a coplanar waveguide feed unit and a microstrip feed unit; the antenna radiation unit comprises a circular patch etched with a bisymmetric sickle-shaped slot structure, and the other side of the circular patch is connected with the microstrip feed unit through a transition section; the coplanar waveguide feed unit is arranged on two sides of the transition section of the circular patch and used for realizing coplanar waveguide feed; the microstrip feed unit is used for converting coplanar waveguide feed into microstrip feed and then is connected with the input end of the rectifying circuit, and the grounding end of the rectifying circuit is connected with the metal ground unit and is used for rectifying the radio frequency energy collected by the antenna unit to obtain direct current energy. The invention can be widely applied to the technical field of electronic devices.
Description
Technical Field
The invention relates to an energy collector, in particular to a double-frequency ultra-wideband flexible environment energy collector, and belongs to the technical field of electronic devices.
Background
In recent years, a large number of ultra-low power consumption and low voltage electronic components and circuits and a large number of electronic microsystems which are difficult to replace batteries in real life are emerging, and in order to ensure normal operation of the system, the electronic equipment needs to meet the requirement of long-term sustainable work. However, the small-sized batteries used in many terminals cannot meet the long-term sustainable operation requirement due to limited energy, and frequent replacement of the batteries increases the cost and is likely to cause environmental pollution. The advent of electronic systems with power consumption in the order of μ W makes it possible to harvest energy from the surrounding environment for long-term sustainable operation of the electronic devices. Radio Frequency (RF) energy harvesters can recover electromagnetic RF energy distributed in the surrounding space, and become a promising power supply solution for low-power devices.
The number of radio transmitters, particularly for mobile base stations and handsets, is now increasing. There are also numerous Wi-Fi routers and wireless end devices such as laptops. In some urban environments, it is possible to detect hundreds of Wi-Fi access points, all of which may serve as energy sources. Wherein, the several main frequency bands with the maximum power flux density are 2G/3G/4G/5G communication frequency bands, ISM-2.4GHz and ISM-5.8GHz. Because the rf energy in the environment has a low power flux density, the receiving antenna preferably captures energy at several frequencies simultaneously, facilitating efficient use of the available rf energy distributed in different frequency bands. The radio frequency energy collector adapting to the multiband or broadband frequency range can further improve the output electric energy, thereby expanding the mobility and simplifying the installation.
However, the conventional rf energy harvester is usually fabricated by etching a metal pattern on a rigid substrate, which is easily deformed or even broken when being pressed and bent by an external force, and is not easily conformal to the terminal device. Therefore, the application of the traditional radio frequency energy harvester in wearable and portable scenes is greatly limited. At present, some flexible conformal energy collectors exist, but the flexible conformal energy collectors can only collect the RF energy of a single frequency point, so that the application scene can only be limited to an indoor scene with a relatively strong Wifi signal, and a single-frequency flexible energy collector is not suitable for an outdoor scene or a public area with strong GSM-900 and GSM-1800.
The physical size of the present broadband and multifrequency energy collector is large, the size of the whole system reaches 300mm, and the system is manufactured by adopting rigid substrates, so that the system is very not beneficial to the application of small-sized terminal equipment and wearable equipment. All parts in the system are connected by SMA conversion heads or direct current wires, so that the system is inconvenient to use in an actual scene.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a dual-frequency ultra-wideband flexible environment energy collector, which has the characteristics of wideband, omnidirectional and flexible, and is very suitable for being integrated with an RFID tag into a self-powered electronic tag, and used for storage, transportation, tracking, etc., so as to realize one-time loading and permanent use. In addition, the device can also be used as a separate flexible power supply module, and portable real-time detection is realized through the conformal wearable device.
In order to realize the purpose, the invention adopts the following technical scheme:
a dual-frequency ultra-wideband flexible environmental energy harvester, comprising: the antenna comprises a flexible substrate, an antenna unit arranged on the flexible substrate, a metal ground unit arranged on the lower surface of the flexible substrate and a rectification circuit; the antenna unit comprises an antenna radiation unit, a coplanar waveguide feed unit and a microstrip feed unit; the antenna radiation unit comprises a circular patch etched with a double-symmetrical sickle-shaped slot structure, and the other side of the circular patch is connected with the microstrip feed unit through a transition section; the coplanar waveguide feed unit is arranged on two sides of the transition section and used for realizing coplanar waveguide feed; the output end of the microstrip feed unit is connected with the metal ground unit and the rectifying circuit and is used for converting the coplanar waveguide feed into microstrip feed; the rectification circuit is used for rectifying the radio frequency energy collected by the antenna unit to obtain direct current energy.
Further, bisymmetry hook type gap structure sets up circular paster center, it includes the semi-ring of two relative settings, each the inboard middle part of semi-ring all is provided with first branch knot of opening a way, first branch knot of opening a way with the semi-ring constitutes hook type structure jointly.
Further, the width of a gap between the two half rings, the radius of the half rings and the relative position of each half ring are determined according to the bandwidth required actually.
Further, the circular patch is 50mm in size.
Further, the transition section is a conical transition section.
Furthermore, the coplanar waveguide feed unit comprises two same-side rounded rectangular patches symmetrically arranged on the upper side and the lower side of the conical transition section.
Furthermore, the microstrip feed unit comprises two triangular patches and a feed microstrip line, the two triangular patches are respectively and tightly connected with the right-angle sides of the two same-side rounded rectangular patches in the coplanar waveguide feed unit into a whole, one end of the feed microstrip line is connected with the conical transition section, and the other end of the feed microstrip line is used as the output end of the microstrip feed unit and is connected with the input end of the rectifying circuit.
Further, the resistance value of the feed microstrip line is 50 ohms.
Furthermore, the flexible substrate is made of a flexible polyimide material.
Further, the rectifying circuit comprises a broadband impedance matching network, a blocking capacitor, a Schottky rectifying diode, an output direct-pass filter and a load resistor which are connected in sequence; the broadband impedance matching network is used for carrying out impedance matching on the radio-frequency signals received by the antenna unit; the blocking capacitor is connected with a first rectifying diode and a second rectifying diode in the Schottky rectifying diode at the same time, the other end of the first rectifying diode is directly grounded, and the other end of the second rectifying diode is connected with the input end of the output through filter; and the output end of the output through filter is connected with the load resistor and is used for filtering high-frequency energy.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the defect that the conventional flexible and flexible conformal energy collector can only collect energy aiming at a single frequency band is overcome. The double-frequency ultra-wideband flexible environment energy collector provided by the invention can cover the whole communication frequency band of 2G/3G/4G/5G, ISM-2.4GHz and ISM-5.8GHz due to the double-symmetrical sickle-shaped gap structure arranged on the circular patch, so that the double-frequency ultra-wideband flexible environment energy collector provided by the invention can be used in various life scenes, and the application range is greatly expanded.
2. The problem that the existing broadband or multi-frequency energy collector is overlarge in size is solved. The invention adopts a novel feeding mode to convert coplanar waveguide feed into microstrip feed, realizes the coverage of the frequency range of 800MHz-3GHz under the physical size of 50mm x 50mm, and etches a novel double-symmetrical sickle-shaped gap structure on an antenna patch to further cover the frequency range of ISM-5.8GHz.
In conclusion, the double-frequency ultra-wideband flexible environment energy collector provided by the invention has the characteristics of miniaturization, flexibility and broadband, is very suitable for wearable and multi-scene application and wireless energy supply of small-sized internet of things equipment, and can be widely applied to the technical field of electronic devices.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like parts are designated with like reference numerals throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of a broadband receiving antenna structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a flexible conformal broadband receiving antenna according to an embodiment of the present invention;
FIG. 3 is a structure diagram of a rectifying circuit of the ultra-wideband flexible energy harvester in the embodiment of the invention;
FIG. 4 shows the reflection coefficient of a receiving antenna with a double symmetric sickle-shaped slot structure and the reflection coefficient of a receiving antenna without a double symmetric sickle-shaped slot structure in an embodiment of the present invention;
fig. 5 shows reflection coefficients of the broadband flexible receiving antenna under different curvature radii in the embodiment of the invention;
fig. 6 is the gain of the broadband flexible receiving antenna according to the frequency variation in the embodiment of the present invention;
FIG. 7 is a reflection coefficient of a wide-band rectifying circuit in an embodiment of the present invention;
FIG. 8 shows the rectification efficiency of a wide-band rectifier circuit according to an embodiment of the present invention;
the reference numerals in the figures are as follows:
1. a flexible substrate; 2. an antenna unit; 21. an antenna radiation unit; 211. a double symmetrical sickle-shaped slit structure; 212. circular patch; 213. a transition section; 214. semi-ring; 215. a first open circuit limb; 22. a coplanar waveguide feed unit; 221. round-corner rectangular patches on the same side; 23. a microstrip feed unit; 231. triangular patch mounting; 232. a feed microstrip line; 3. a metal ground unit; 4. a rectifying circuit; 41. a broadband impedance matching network; 411. a first microstrip line; 412. a second microstrip line; 413. a third microstrip line; 414. a fourth microstrip line; 42. a blocking capacitor; 43. a Schottky rectifier diode; 431. a first rectifying diode; 432. a second rectifying diode; 44. an output pass-through filter; 441. a fifth microstrip line; 442. a sixth microstrip line; 443. a second open circuit branch; 444. a third branch section; 45. a load resistance; 46. a power source; 47. internal resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
First, the technical terms related to the present invention will be briefly described:
the RF is called Radio Frequency, and represents the electromagnetic Frequency which can be radiated to the space, and the Frequency range is between 300kHz and 300 GHz. The radio frequency is radio frequency current, and is a short for high-frequency alternating current variable electromagnetic wave.
AC is called Alternating Current, and refers to Current with Current direction changing periodically along with time, and the average Current in one period is zero. Unlike direct current, the direction of alternating current changes over time without the direct current changing periodically.
DC is generally called Direct Current, which is a Current whose Current direction does not change periodically with time, but the Current magnitude may not be fixed, and generates a waveform.
GSM, known as Global System for Mobile Communications, a digital Mobile Communications standard developed by the European Telecommunications standards institute, ETSI.
ISM Band (Industrial Scientific Band), chinese means Industrial, scientific and Medical respectively, so that the ISM Band is a Band opened by countries to be mainly used by Industrial, scientific and Medical institutions.
Example 1
As shown in fig. 1 to fig. 3, the present embodiment provides a dual-frequency ultra-wideband flexible environmental energy harvester, which includes: the antenna device comprises a flexible substrate 1, an antenna unit 2 arranged on the upper surface of the flexible substrate 1, a metal ground unit 3 arranged on the lower surface of the flexible substrate 1 and a rectifying circuit 4. The antenna unit 2 comprises an antenna radiation unit 21, a coplanar waveguide feed unit 22 and a microstrip feed unit 23, the antenna radiation unit 21 comprises a circular patch 212 etched with a bisymmetric sickle-shaped slot structure 211, and the other side of the circular patch 212 is connected with the microstrip feed unit 23 through a transition section 213; the coplanar waveguide feed unit 22 is arranged at two sides of the transition section 213 of the circular patch 212 and used for realizing coplanar waveguide feed; the output end of the microstrip feed unit 23 is connected with the metal ground unit 3 and the rectifying circuit 4, and is used for converting coplanar waveguide feed into microstrip feed; the rectification circuit 4 is used for rectifying the radio frequency energy collected by the antenna unit 2 to obtain direct current energy.
In the above embodiment, preferably, the double symmetrical sickle-shaped slot structure 211 is disposed at the center of the circular patch 212, and includes two opposite half rings 214, a first open branch 215 is disposed at the middle inside each half ring 214, and the first open branch 215 and the half rings 214 together form a sickle-shaped structure for expanding the bandwidth.
In the above embodiment, preferably, the width of the gap between the two half rings 214, the radius of the half ring 214, and the relative position of the half ring 214 can be determined according to the actual required bandwidth.
In the above embodiment, the circular patch 212 preferably has a size of 50mm.
In the above embodiment, the transition section 213 of the circular patch 212 is preferably a tapered transition section to optimize the matching performance of the feeding end.
In the above embodiment, preferably, the coplanar waveguide feed unit 22 includes two same-side rounded rectangular patches 221 symmetrically disposed on the upper and lower sides of the tapered transition section 213, and the rectangular patches both adopt rounded corners, mainly for optimizing the matching performance of the feed end.
In the above embodiment, preferably, the microstrip feed unit 23 includes two triangular patches 231 and a feed microstrip line 232, and the two triangular patches 231 are respectively and tightly connected with the right-angle sides of the two same-side rounded rectangular patches 221 in the coplanar waveguide feed unit 22 as a whole (or adopt an integrated structure), one end of the feed microstrip line 232 is connected with the tapered transition section 213, and the other end of the feed microstrip line 232 is connected with the input end of the rectification circuit 4 as the output port of the antenna unit 2.
In the above embodiment, the feed microstrip line 232 is preferably a 50-ohm microstrip line.
In the above embodiment, preferably, the metal ground unit 3 is a rectangular patch, and realizes conversion from coplanar waveguide feeding to microstrip feeding together with the microstrip feeding unit 23, so as to facilitate connection with a rectification circuit in the next step.
In the above embodiment, the flexible substrate 1 is preferably made of a flexible Polyimide (PI) material, which has characteristics of ultra-thinness and deformability, and also has a characteristic of low transmission loss, and the dielectric loss can be reduced to the maximum extent by using a low-loss dielectric substrate, so as to improve the efficiency of the energy collector.
In the above embodiment, preferably, as shown in fig. 3, the rectifying circuit 4 includes a broadband impedance matching network 41, a dc blocking capacitor 42, a schottky rectifying diode 43, an output pass filter 44 and a load resistor 45 connected in sequence. The wideband impedance matching network 41 is configured to perform impedance matching on the radio frequency signal received by the antenna unit 2; the blocking capacitor 42 is connected to both the first rectifying diode 431 and the second rectifying diode 432 of the schottky rectifying diode 43, and the other end of the first rectifying diode 431 is directly grounded, and the other end of the second rectifying diode 432 is connected to the input end of the output pass filter 44; the output of the output pass filter 44 is connected to a load resistor 45 for filtering out high frequency energy.
In the above embodiment, preferably, the wideband impedance matching network 41 includes the first microstrip line 411 to the fourth microstrip line 412, one end of the first microstrip line 411 is respectively connected to the feed microstrip line 232 and the power source 46 in the antenna unit 2, and the other end of the power source 46 is grounded via the internal resistance 47; the other end of the first microstrip line 411 is connected to one end of the second microstrip line 412 to one end of the fourth microstrip line 414, the other ends of the second microstrip line 412 and the third microstrip line 413 are open-circuited, and the other end of the fourth microstrip line 414 is connected to the dc blocking capacitor 42 as the output end of the wideband impedance matching network 41. For different frequencies, the same microstrip line has different electrical lengths, the input impedance at two frequency points (i.e. the central frequency points of the two frequency bands are 1.8GHz and 5.8 GHz) can be in a conjugate state by the allocation of the fourth microstrip line 414, the second microstrip line 412 and the third microstrip line 413 are connected in parallel and are in open-circuit short circuit, so that the whole input impedance of the rectifying circuit 4 is compressed, the imaginary part is close to zero, and then the first microstrip line 411 matches the input impedance to 50 ohms.
In the above embodiment, preferably, the output straight-pass filter 44 is formed by connecting the fifth microstrip line 441, the sixth microstrip line 442, and the upper and lower two quarter-wavelength second open-circuit branches 443 and the third open-circuit branches 444, and is configured to enable the direct-current energy output by rectification to pass smoothly, so as to present a high impedance to the high-frequency energy for filtering.
Example 2
In this embodiment, all the numerical results of the dual-frequency ultra-wideband flexible environment energy harvester proposed in embodiment 1 are simulated by using the full-wave simulator CST.
As shown in FIG. 4, the scattering parameter, S, is a simulated 11 Is the reflection coefficient of the receiving antenna. Fig. 4 shows the reflection coefficients before and after loading the double symmetrical sickle-shaped slot structure, which can effectively increase the bandwidth of the antenna without increasing the size. According to simulation results, the bandwidth of the broadband flexible receiving antenna loaded with the double-symmetrical sickle-shaped slot is 0.8GHz-6GHz, and the relative bandwidth is 153%. Compared with a broadband flexible receiving antenna which is not loaded with a double-symmetrical sickle-shaped slot structure, the bandwidth is increased by 53%.
A cylinder is selected as a carrier of the flexible antenna, and the performance of the flexible antenna is simulated on curvatures with different bending radii. Fig. 5 shows the reflection coefficients of the flexible antenna under different curvature radiuses, and it can be seen from the results that the reflection coefficient of the flexible antenna does not change more than 40% under the curvature radiuses of 35mm-55 mm.
Fig. 6 shows that when the curvature radius of the flexible antenna is 35mm, the gain at different frequencies maintains a good omnidirectional radiation characteristic in the whole frequency band range, and the gain is-2-7 dBi and gradually increases along with the frequency.
In this embodiment, the rectifying circuit is a schottky rectifying diode of SMS7630 type, which has a low turn-on voltage suitable for a low input power scene of environmental energy collection, and a voltage doubling rectifying circuit is used to provide a higher dc voltage for facilitating energy collection and storage. The design of a broadband matching network is carried out aiming at the frequency distribution of energy in the environment, and the design of a broadband rectifying circuit covering two frequency bands of 0.9-2.4GHz and 5.6-6.3GHz is realized. The rectification circuit is subjected to simulation optimization design, the reflection coefficient of the rectification circuit is shown in fig. 7, and matching can be achieved on a wide frequency band through a broadband impedance matching network. FIG. 8 is a graph of rectification efficiency of the rectifier circuit varying with frequency, and it can be seen from simulation results that the rectifier circuit achieves coverage of two wide frequency bands of 0.9-2.4GHZ and 5.6-6.3 GHZ. The rectification efficiency of the frequency band of 0.9-2.4GHZ is kept above 46%, and the rectification efficiency of the frequency band of 5.6-6.3GHZ can be above 35%.
In summary, the dual-frequency ultra-wideband flexible environment energy harvester provided by the embodiment has the following characteristics:
1. the energy harvester has the ultra-wideband characteristic. The broadband rectifying antenna realizes the ultra-wideband characteristic of 0.8-6GHz, and the relative bandwidth is 153%. The rectifying circuit realizes double-frequency ultra-wideband, the central frequency is 1.65GHz, and the relative bandwidth is 94%; the center frequency was 5.8GHz and the relative bandwidth was 24%.
2. The energy harvester has flexibility. In the change process of the curvature radius of the carrier ranging from 35mm to 55mm, the bandwidth change of the reflection coefficient does not exceed 40%, the gain is almost unchanged, and high performance indexes can be kept in a bending state.
3. The energy harvester has the characteristic of miniaturization. Compared with the prior similar ultra-wideband rigid energy harvester, the size is reduced by 86 percent.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A dual-frequency ultra-wideband flexible environmental energy harvester, comprising:
the antenna comprises a flexible substrate, an antenna unit arranged on the flexible substrate, a metal ground unit arranged on the lower surface of the flexible substrate and a rectifying circuit;
the antenna unit comprises an antenna radiation unit, a coplanar waveguide feed unit and a microstrip feed unit;
the antenna radiation unit comprises a circular patch etched with a bisymmetric sickle-shaped slot structure, and the other side of the circular patch is connected with the microstrip feed unit through a transition section;
the double-symmetrical sickle-shaped gap structure is arranged in the center of the circular patch and comprises two half rings which are oppositely arranged, the middle part of the inner side of each half ring is provided with a first open-circuit branch, and the first open-circuit branch and the half rings form a sickle-shaped structure together;
the coplanar waveguide feed unit is arranged on two sides of the transition section and used for realizing coplanar waveguide feed;
the output end of the microstrip feed unit is connected with the metal ground unit and the rectifying circuit and is used for converting the coplanar waveguide feed into microstrip feed;
the coplanar waveguide feed unit comprises two same-side rounded rectangular patches which are symmetrically arranged on the upper side and the lower side of the conical transition section; the microstrip feed unit comprises two triangular patches and a feed microstrip line, the two triangular patches are respectively and tightly connected with the right-angle sides of two same-side rounded rectangular patches in the coplanar waveguide feed unit into a whole, one end of the feed microstrip line is connected with the conical transition section, and the other end of the feed microstrip line is used as the output end of the microstrip feed unit and is connected with the input end of the rectifying circuit;
the rectification circuit is used for rectifying the radio frequency energy collected by the antenna unit to obtain direct current energy; the rectifying circuit comprises a broadband impedance matching network, a blocking capacitor, a Schottky rectifying diode, an output direct-pass filter and a load resistor which are sequentially connected; the broadband impedance matching network is used for carrying out impedance matching on the radio-frequency signals received by the antenna unit; the blocking capacitor is connected with a first rectifying diode and a second rectifying diode in the Schottky rectifying diode at the same time, the other end of the first rectifying diode is directly grounded, and the other end of the second rectifying diode is connected with the input end of the output through filter; and the output end of the output through filter is connected with the load resistor and is used for filtering high-frequency energy.
2. The dual-frequency ultra-wideband flexible environmental energy harvester of claim 1, wherein the width of the gap between the two half-rings, the radius of the half-rings, and the relative positions of the half-rings are determined according to the actual required bandwidth.
3. The dual-frequency ultra-wideband flexible environmental energy harvester of claim 1, wherein the circular patch is 50mm by 50mm in size.
4. The dual-frequency ultra-wideband flexible environmental energy harvester of claim 1, wherein the resistance of the feed microstrip line is 50 ohms.
5. The dual-frequency ultra-wideband flexible environmental energy harvester of claim 1, wherein the flexible substrate is made of a flexible polyimide material.
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| FR2907969A1 (en) * | 2006-10-27 | 2008-05-02 | Groupe Ecoles Telecomm | Mono/multifrequency transmission/reception antenna e.g. slot patch antenna, for e.g. mobile terminal, has armature and inductive element define resonator circuit, where armature presents discontinuities representing radiation loss origin |
| CN105789850A (en) * | 2014-12-19 | 2016-07-20 | 哈尔滨飞羽科技有限公司 | Ultra wideband antenna based on dual T-shaped groove |
| CN107895842A (en) * | 2017-10-18 | 2018-04-10 | 江苏大学 | A kind of clock apparatus of radio-frequency electromagnetic wave energy power supply |
| CN111129759A (en) * | 2020-01-14 | 2020-05-08 | 山西大学 | Integrated broadband circularly polarized rectifying antenna capable of being conformal |
| CN112713404A (en) * | 2021-03-25 | 2021-04-27 | 网络通信与安全紫金山实验室 | Single-layer broadband microstrip patch antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103515708A (en) * | 2013-08-05 | 2014-01-15 | 安徽大学 | Dual-frequency antenna based on wave-transparent enhancement characteristics |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2907969A1 (en) * | 2006-10-27 | 2008-05-02 | Groupe Ecoles Telecomm | Mono/multifrequency transmission/reception antenna e.g. slot patch antenna, for e.g. mobile terminal, has armature and inductive element define resonator circuit, where armature presents discontinuities representing radiation loss origin |
| CN105789850A (en) * | 2014-12-19 | 2016-07-20 | 哈尔滨飞羽科技有限公司 | Ultra wideband antenna based on dual T-shaped groove |
| CN107895842A (en) * | 2017-10-18 | 2018-04-10 | 江苏大学 | A kind of clock apparatus of radio-frequency electromagnetic wave energy power supply |
| CN111129759A (en) * | 2020-01-14 | 2020-05-08 | 山西大学 | Integrated broadband circularly polarized rectifying antenna capable of being conformal |
| CN112713404A (en) * | 2021-03-25 | 2021-04-27 | 网络通信与安全紫金山实验室 | Single-layer broadband microstrip patch antenna |
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