CN111988051A - Novel high-efficiency 5.8GHz rectifying antenna - Google Patents
Novel high-efficiency 5.8GHz rectifying antenna Download PDFInfo
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- CN111988051A CN111988051A CN202010841014.1A CN202010841014A CN111988051A CN 111988051 A CN111988051 A CN 111988051A CN 202010841014 A CN202010841014 A CN 202010841014A CN 111988051 A CN111988051 A CN 111988051A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/14—Automatic detuning arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
Abstract
The invention relates to a novel high-efficiency 5.8GHz rectifying antenna, which belongs to the field of wireless energy transmission and comprises a receiving antenna, a high-low impedance line input low-pass filter, a second rectifying diode, a three-fan-shaped branch straight-through filter and a load which are sequentially connected. The impedance of the receiving antenna is consistent with that of the diode, so that the aim of canceling a matching network is fulfilled, the whole area of a circuit is reduced, the loss caused by the matching circuit is reduced, and the whole efficiency of the rectification antenna is improved.
Description
Technical Field
The invention belongs to the field of wireless energy transmission, and relates to a novel high-efficiency 5.8GHz rectifying antenna.
Background
In recent years, 5G communication and microwave wireless power transmission are research hotspots in various industries, and wireless energy transmission (WPT) and Wireless Energy Harvesting (WEH) by using a rectenna are emerging technologies. Multi-band, miniaturization, broadband, ultra-wideband, high-gain, harmonic filtering, etc. have become the development trend of receiving antennas. The rectifier circuit is developed toward high efficiency, wide load, compact size, and the like. Therefore, reasonably improving the structures of the rectifying circuit and the receiving antenna so as to achieve the purpose of improving the conversion efficiency of the rectifying antenna is a valuable research subject.
Researchers at home and abroad carry out a great deal of research on the rectifying antenna, the conversion efficiency is taken as an important index for judging the performance of the rectifying antenna, meanwhile, a plurality of design ideas and research schemes are formed, the method is more suitable for scenes with low requirements on the conversion efficiency, and the research on improving the conversion efficiency of the rectifying antenna is never stopped. The structure of a conventional rectenna is shown in fig. 1, and mainly comprises a receiving antenna, an LPF, a matching network circuit, a rectifier diode, a straight-through filter composed of a quarter-wavelength microstrip line and a parallel capacitor, and a load. The conventional rectenna design still has the following problems: (1) in the existing rectifying antenna, a diode part mainly adopts a single-tube series mode, and the rectifying efficiency is not high. (2) The existing rectification antenna mainly adopts a direct-pass filter composed of a quarter-wavelength microstrip line and a capacitor at a direct-pass filter part, and mainly has the following defects: parasitic effect is generated, and the high-frequency capacitor is relatively expensive. (3) The existing rectifying antenna has a matching network, and the existence of the matching network increases the complexity of a circuit (more circuit elements), and has the disadvantages of higher loss, larger size and higher cost. (4) The high-order harmonic signals generated by rectification cannot be effectively suppressed, and the conversion efficiency of the rectification antenna is reduced.
In summary, in the conventional rectenna, the diode part mainly adopts a single-tube series mode, and the rectifying efficiency is not high; the direct-through filter part mainly adopts a direct-through filter formed by a quarter-wavelength microstrip line and a capacitor, and mainly has the defects of parasitic effect generation and relatively high price of a high-frequency capacitor. The existing rectifying antenna has a matching network, and the existence of the matching network increases the complexity of a circuit (more circuit elements), and has the disadvantages of higher loss, larger size and higher cost.
Disclosure of Invention
In view of this, the present invention provides a novel high-efficiency 5.8GHz rectenna, which is used to simplify the overall structure, reduce the cost, and improve the transmission effect.
In order to achieve the purpose, the invention provides the following technical scheme:
a novel high-efficiency 5.8GHz rectifying antenna comprises a receiving antenna, a high-low impedance line input low-pass filter, a second rectifying diode, a three-fan-shaped branch straight-through filter and a load which are connected in sequence; the input end of the first rectifying diode is grounded, and the output end of the first rectifying diode is connected with the output end of the high-low impedance line input low-pass filter;
the receiving antenna is used for collecting electromagnetic waves in the space and converting the electromagnetic waves into guided waves on the transmission line;
the high-low impedance line input low-pass filter is used for filtering noise waves higher than a cut-off noise wave and transmitting the noise waves to the rectifier diode;
the first rectifier diode returns the radio frequency energy to the second rectifier diode for rectification again;
the second rectifier diode allows direct current to pass through, prevents radio frequency energy such as fundamental frequency, higher harmonic and the like from entering a load, and provides stable direct current input for the load;
the three-sector branch straight-through filter is used for filtering out first harmonic, second harmonic and higher harmonic;
the load is grounded.
Further, the receiving antenna is a rectangular antenna rotated by a predetermined angle.
Further, the rectangular antenna works in a 5.8GHz frequency band.
Furthermore, the rectangular antenna is printed on a PCB, a dielectric material of the rectangular antenna is FR4, the adopted feeding mode is center feeding in microstrip feeding, the SMA head is connected with a high-low impedance line input low-pass filter, the impedance of the antenna is changed by rotating the antenna, and the impedance of the antenna is consistent with that of a diode.
Furthermore, the working frequency of the high-low impedance line input low-pass filter is 5.8GHz, the high-low impedance line input low-pass filter is connected with the rectangular antenna through the SMA head, and the impedance of the input end and the impedance of the output end of the high-low impedance line input low-pass filter are consistent with the impedance of the first rectifying diode and the impedance of the second rectifying diode.
Further, the three-fan-shaped branch straight-through filter can achieve the suppression of fundamental frequency and second harmonic by adjusting the radius and the angle of the fan-shaped branches.
Further, the dielectric material adopted by the high-low impedance line input low-pass filter and the three-fan-shaped branch straight-through filter is FR 4.
Further, the first rectifying diode and the second rectifying diode are both HSMS 286C.
The invention has the beneficial effects that:
(1) the structure of the rectangular antenna is changed (the rectangular antenna is rotated by a certain angle), so that the impedance of the rectangular antenna is consistent with that of the diode, the aim of canceling a matching network is fulfilled, the whole area of a circuit is reduced, loss caused by the matching circuit is reduced, and the whole efficiency of the rectification antenna is improved.
(2) In order to reduce the design difficulty, the invention can directly use the design guide in ADS to rapidly design the high-low impedance line input low-pass filter.
(3) The structure adopted by the invention in the aspect of the straight-through filter is that the three-sector branch straight-through filter is loaded, and the good inhibition effect of the frequency point is realized by adjusting the length and the angle of the sector branch. Compared with a quarter-wavelength microstrip line and parallel capacitor mode, the cost is lower, and the harmonic suppression capability is stronger.
(4) The invention adopts a diode double-tube series-parallel mode, which is beneficial to improving the rectification efficiency.
(5) The rectifier circuit part of the invention has no via hole in the whole circuit.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a structural view of a conventional rectenna;
fig. 2 is a structural diagram of the novel high-efficiency 5.8GHz rectenna of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 2, the invention is a novel high-efficiency 5.8GHz rectenna, which comprises a rectangular antenna rotated by a certain angle, a high-low impedance line Low Pass Filter (LPF), two rectennas, a fan-shaped branch straight-through filter and a load.
In this embodiment, the diode is composed of two HSMS286C, and the connection mode is a dual-tube series-parallel mode; the impedance at the position where the efficiency of the diode is maximum can be measured by means of ADS software.
In this embodiment, the receiving antenna is composed of a rectangular antenna, the operating frequency is 5.8GHz, the rectangular antenna is printed on a PCB board, the dielectric material of the rectangular antenna is FR4, the loss tangent and the relative dielectric constant are 0.02 and 4.4, respectively, the adopted feeding mode is center feeding in microstrip feeding, the antenna is connected with a filter through an SMA head, the impedance of the antenna is changed by rotating the antenna, and the impedance of the antenna is consistent with the impedance of a diode.
In this embodiment, the low pass filter has an operating frequency of 5.8GHz, is fabricated on a PCB board made of FR4 dielectric material, has a dielectric constant of 4.4 and a loss tangent of 0.02, and is connected to an antenna through an SMA head, and the impedance of its input and output terminals is kept consistent with the impedance of a diode.
In this embodiment, the three-fan-shaped stub through filter can suppress fundamental frequency and second harmonic by adjusting the radius and angle of the fan-shaped stub, the dielectric material used for the through filter is also FR4, and the impedance of the input and output terminals of the through filter is consistent with the impedance of the diode.
Compared with the existing model, the invention has less matching network parts because the impedances of the antenna, the LPF and the output filter can be set according to the requirements. However, the diode is a nonlinear element, and needs to be measured at a specific working frequency and input power, and in consideration of the factors, the point with the maximum diode efficiency is selected for impedance measurement. Then, the impedances of the input and output terminals of the antenna, the LPF, and the output filter are set to be in accordance with the diodes. And finally, performing tuning analysis on the circuit, wherein the aim is to improve the integral rectification efficiency.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. The utility model provides a novel high efficiency 5.8 GHz's rectenna which characterized in that: the three-section straight-through filter comprises a receiving antenna, a high-low impedance line input low-pass filter, a second rectifier diode, a three-sector branch straight-through filter and a load which are connected in sequence; the input end of the first rectifying diode is grounded, and the output end of the first rectifying diode is connected with the output end of the high-low impedance line input low-pass filter;
the receiving antenna is used for collecting electromagnetic waves in the space and converting the electromagnetic waves into guided waves on the transmission line;
the high-low impedance line input low-pass filter is used for filtering noise waves higher than a cut-off noise wave and transmitting the noise waves to the rectifier diode;
the first rectifier diode returns the radio frequency energy to the second rectifier diode for rectification again;
the second rectifier diode allows direct current to pass through, prevents radio frequency energy such as fundamental frequency, higher harmonic and the like from entering a load, and provides stable direct current input for the load;
the three-sector branch straight-through filter is used for filtering out first harmonic, second harmonic and higher harmonic;
the load is grounded.
2. A novel high efficiency 5.8GHz rectenna as claimed in claim 1, wherein: the receiving antenna is a rectangular antenna which rotates by a preset angle.
3. A novel high efficiency 5.8GHz rectenna as claimed in claim 2, wherein: the rectangular antenna works in a 5.8GHz frequency band.
4. A novel high efficiency 5.8GHz rectenna as claimed in claim 2, wherein: the rectangular antenna is printed on a PCB, a medium material of the rectangular antenna is FR4, the adopted feeding mode is center feeding in microstrip feeding, the rectangular antenna is connected with a high-low impedance line input low-pass filter through an SMA head, the impedance of the rectangular antenna is changed by rotating the rectangular antenna, and the impedance of the rectangular antenna is consistent with that of a diode.
5. A novel high efficiency 5.8GHz rectenna as claimed in claim 2, wherein: the working frequency of the high-low impedance line input low-pass filter is 5.8GHz, the high-low impedance line input low-pass filter is connected with the rectangular antenna through the SMA head, and the impedance of the input end and the impedance of the output end of the high-low impedance line input low-pass filter are consistent with the impedance of the first rectifier diode and the second rectifier diode.
6. A novel high efficiency 5.8GHz rectenna as claimed in claim 1, wherein: the three-fan-shaped branch straight-through filter can achieve the suppression of fundamental frequency and second harmonic by adjusting the radius and the angle of the fan-shaped branches.
7. A novel high efficiency 5.8GHz rectenna as claimed in claim 1, wherein: the high-low impedance line input low-pass filter and the three-fan-shaped branch straight-through filter are made of FR4 dielectric materials.
8. A novel high efficiency 5.8GHz rectenna as claimed in claim 1, wherein: the first rectifying diode and the second rectifying diode are both HSMS 286C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010841014.1A CN111988051A (en) | 2020-08-20 | 2020-08-20 | Novel high-efficiency 5.8GHz rectifying antenna |
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| CN202010841014.1A CN111988051A (en) | 2020-08-20 | 2020-08-20 | Novel high-efficiency 5.8GHz rectifying antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276264A (en) * | 2022-08-23 | 2022-11-01 | 重庆邮电大学 | Broadband high-efficiency radio frequency energy collection rectification circuit |
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| CN106785390A (en) * | 2016-12-15 | 2017-05-31 | 电子科技大学 | A kind of 5.8GHz microwave rectification antennas of two antenna element |
| CN108767461A (en) * | 2018-05-23 | 2018-11-06 | 西南大学 | Binary channels RF energy collection system and its Parameters design |
| CN110138103A (en) * | 2019-04-17 | 2019-08-16 | 电子科技大学 | A kind of radio frequency micro-energy acquisition device based on three frequency range RECTIFYING ANTENNAs |
| CN110444910A (en) * | 2019-09-05 | 2019-11-12 | 重庆邮电大学 | A kind of 2.45GHz micro-strip RECTIFYING ANTENNA of regular hexagon structure |
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2020
- 2020-08-20 CN CN202010841014.1A patent/CN111988051A/en active Pending
Patent Citations (4)
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| CN106785390A (en) * | 2016-12-15 | 2017-05-31 | 电子科技大学 | A kind of 5.8GHz microwave rectification antennas of two antenna element |
| CN108767461A (en) * | 2018-05-23 | 2018-11-06 | 西南大学 | Binary channels RF energy collection system and its Parameters design |
| CN110138103A (en) * | 2019-04-17 | 2019-08-16 | 电子科技大学 | A kind of radio frequency micro-energy acquisition device based on three frequency range RECTIFYING ANTENNAs |
| CN110444910A (en) * | 2019-09-05 | 2019-11-12 | 重庆邮电大学 | A kind of 2.45GHz micro-strip RECTIFYING ANTENNA of regular hexagon structure |
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| CN115276264A (en) * | 2022-08-23 | 2022-11-01 | 重庆邮电大学 | Broadband high-efficiency radio frequency energy collection rectification circuit |
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Application publication date: 20201124 |