CN216750289U - Seven-frequency-band omnidirectional rectifying antenna - Google Patents
Seven-frequency-band omnidirectional rectifying antenna Download PDFInfo
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- CN216750289U CN216750289U CN202220018174.0U CN202220018174U CN216750289U CN 216750289 U CN216750289 U CN 216750289U CN 202220018174 U CN202220018174 U CN 202220018174U CN 216750289 U CN216750289 U CN 216750289U
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Abstract
The utility model discloses a seven-frequency-band omnidirectional rectifying antenna, which comprises an antenna unit and a rectifying circuit unit which are connected with each other; the antenna unit is an omnidirectional antenna; the rectifying circuit unit comprises three impedance matching circuits which are connected in parallel, and the receiving radio frequency bands of the impedance matching circuits are different; the three impedance matching circuits are set as double-frequency-band impedance matching circuits of an upper circuit and a lower circuit and a three-frequency-band impedance matching circuit of a middle circuit; the three impedance matching circuits are connected in parallel and then connected in series with the load. The omnidirectional electromagnetic wave collector has good omnidirectional performance, can collect electromagnetic waves in all directions in a wide frequency band, can collect multi-band radio frequency energy in the environment, and can convert the multi-band radio frequency energy into direct current energy for power supply.
Description
Technical Field
The utility model belongs to the technical field of communication, and particularly relates to a seven-frequency-band omnidirectional rectifying antenna.
Background
With the development of wireless communication technology, low-power electronic devices used in applications such as internet of things, smart cities, wireless sensor networks and the like are increasing. For these low power electronic devices, replacing the battery is a time consuming and expensive task. Therefore, there has been a wide interest in harvesting energy from the surrounding environment to power low power electronic devices. Compared with wind energy, solar energy and kinetic energy collection, the radio frequency energy collection has the characteristics of implantation and sustainable collection for supplying electric energy to the electronic equipment. In addition, with the development of 5G communication technology, the number of radio frequency sources such as 5G communication base stations, Wi-Fi and the like in the surrounding environment is significantly increased, which means that it is more feasible to collect radio frequency energy to power the device.
The rectenna is a core component for microwave energy harvesting and functions to convert radio frequency power into output direct current power. The rectenna is generally composed of a rectifying circuit and a receiving antenna, and the RF-DC conversion efficiency is an important parameter for evaluating the performance of the rectenna. The spatial radio frequency energy has the characteristic of random distribution in different frequency bands, such as GSM1800, LTE, 5G and the like. In order to fully collect multiple frequency bands in the environment to obtain more radio frequency energy, a multiband rectenna is receiving wide attention. With the advent of 5G communication technology, the surrounding space will have more and more radio frequency energy in the 5G band. So far, all the studied rectennas cannot operate simultaneously in the GSM1800, LTE, Wi-Fi and 5G frequency bands. In addition, radio frequency energy is randomly distributed in spatial positions, but most of currently researched receiving antennas are directional antennas, and radio frequency energy in the space cannot be collected from multiple angles in a broadband range.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a seven-band omnidirectional rectenna, which has good omnidirectional performance, can collect electromagnetic waves in all directions in a wider frequency band, can collect multi-band radio frequency energy in the environment, and converts the multi-band radio frequency energy into direct current energy for power supply.
In order to solve the technical problem, the technical scheme of the utility model is a seven-frequency-band omnidirectional rectifying antenna which comprises an antenna unit and a rectifying circuit unit which are connected with each other; the antenna unit is an omnidirectional antenna; the rectifying circuit unit comprises three impedance matching circuits which are connected in parallel, and the receiving radio frequency bands of the impedance matching circuits are different; the three impedance matching circuits are set as double-frequency-band impedance matching circuits of an upper circuit and a lower circuit and a three-frequency-band impedance matching circuit of a middle circuit; the three impedance matching circuits are connected in parallel and then connected in series with the load.
The antenna unit comprises an upper metal patch, a middle layer medium substrate and a lower metal patch, wherein the upper metal patch and the lower metal patch are respectively etched on the upper surface and the lower surface of the middle layer medium substrate.
The upper metal patch comprises an upper oval metal patch, a first upper rectangular metal patch and a second upper rectangular metal patch which are arranged from top to bottom respectively, wherein the second upper rectangular metal patch is used as a feeder line.
And an SMA connector is connected below the antenna unit and used for connecting the second upper rectangular metal patch and the lower metal patch.
The impedance matching circuit comprises a multiband impedance matching circuit, a diode and a band-pass filter which are connected in sequence.
The rectifier circuit unit is disposed on the dielectric substrate.
The models of the middle layer dielectric substrate and the rectifying circuit dielectric substrate are the same, the middle layer dielectric substrate and the rectifying circuit dielectric substrate are both made of RT/duroid5880 materials with the dielectric constant of 2.2, the loss tangent is 0.0009, and the thickness is 0.787 mm.
The diode is a schottky diode SMS 7630.
The working frequency band of the antenna unit is 1.67GHz-5.92 GHz.
The band-pass filter is a fan-shaped branch band-pass filter.
Compared with the prior art, the utility model has the beneficial effects that:
the omnidirectional electromagnetic wave collector has good omnidirectional performance, can collect electromagnetic waves incident from all directions in a wide frequency band, can collect multi-band radio frequency energy in the environment, and can convert the multi-band radio frequency energy into direct current energy for power supply.
Drawings
Fig. 1 is a schematic front view of an antenna according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an opposite structure of an antenna according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a front side structure of a rectifier circuit according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating simulation and test results of antenna reflection coefficients in an embodiment of the present invention;
FIG. 5 is a diagram of antenna radiation pattern simulation and test results in accordance with an embodiment of the present invention;
FIG. 6 is a diagram of a reflection coefficient simulation and test result of a rectifier circuit in an embodiment of the present invention;
FIG. 7 is a simulation and test result of the conversion efficiency of the rectifier circuit varying with frequency in the embodiment of the present invention
FIG. 8 is a graph of simulation results of the conversion efficiency of a rectifier circuit as a function of input power in an embodiment of the present invention;
FIG. 9 is a graph of the test results of the conversion efficiency of the rectifier circuit as a function of the input power in an embodiment of the present invention;
in the figure, 1-upper-layer oval metal patch, 2-first upper-layer rectangular metal patch, 3-second upper-layer rectangular metal patch, 4-lower-layer metal patch, 5 middle-layer dielectric substrate, 6-upper-circuit matching circuit, 7-middle-circuit matching circuit, 8-lower-circuit matching circuit, 9-fan-shaped branch band-pass filter, 10-Schottky diode and 11-resistance load.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The structure of the seven-band omnidirectional rectenna provided by the embodiments of the present invention is shown in fig. 1, 2 and 3, and comprises two parts, namely an antenna and a rectifying circuit; the antenna part comprises an upper elliptical metal patch 1, a first upper rectangular metal patch 2, a second upper rectangular metal patch 3, a lower metal patch 4 and an intermediate medium substrate 5; the rectifying circuit part comprises an upper path matching circuit 6, a middle path matching circuit 7, a lower path matching circuit 8, a fan-shaped branch band-pass filter 9, a Schottky diode 10 and a resistive load 11; wherein, the upper elliptical metal patch 1 and the two upper rectangular metal patches are arranged on the upper side surface of the middle dielectric substrate 5; the lower metal patch 4 is arranged on the lower surface of the middle dielectric substrate 5.
The lower metal patch 4 is formed by a rectangular metal patch which is grooved at two sides and grooved in the middle.
The upper-layer oval metal patch 1 is connected with the first rectangular metal patch 2 and the second rectangular metal patch 3; the antenna adopts microstrip line feed, and the second rectangular metal patch 3 is a feed line. The SMA joint is positioned below the antenna and connected with the second rectangular metal patch 3 and the lower metal patch 4.
In the embodiment of the utility model, the rectifying circuit consists of three paths, the upper path consists of a dual-band impedance matching circuit, a diode 10 and a band-pass filter, the middle path consists of a tri-band impedance matching circuit, a diode 10 and a band-pass filter, the lower path consists of another dual-band impedance matching circuit, the same diode 10 and the same band-pass filter, and finally, one path is synthesized by the three paths and is connected with a resistance load 11; the circuitry is disposed on the dielectric substrate 12.
In the embodiment of the utility model, the number of the diodes 10 is 3, and schottky diodes SMS7630 are adopted and are respectively placed in the upper, middle and lower three-way rectifying circuits in a parallel connection mode.
In the embodiment of the utility model, the band-pass filter adopts a micro-strip structure with fan-shaped branches, and the fan-shaped branches generate resonance at the fundamental frequency of the working frequency band of the rectifying circuit, so that only direct current is allowed to pass through, and the band-stop filter has the function of a band-stop filter.
The broadband omnidirectional antenna is reasonably designed in the embodiment of the utility model, so that the broadband omnidirectional antenna can have good omnidirectional performance in the frequency band of 1.67GHz-5.92GHz, and can collect electromagnetic waves in all directions in a wider frequency band.
As shown in fig. 1-3, the present invention provides a method of manufacturing a semiconductor deviceA novel seven-frequency-band radio-frequency energy collecting rectification antenna is used for collecting radio-frequency energy of GSM1800(1.8GHz), LTE (2.1GHz), WLAN/Wi-Fi (2.4GHz, 5.8GHz) and 5G (2.6GHz, 3.5GHz, 4.9GHz) frequency bands. The whole antenna is divided into two parts, namely a broadband omnidirectional collecting antenna and a seven-frequency-band rectifying circuit, wherein the size of the antenna is 55 multiplied by 50 multiplied by 0.787mm3(length x width x height), the size of the rectification circuit is 60 x 58 x 0.787mm3(length × width × height).
As shown in fig. 1-2, two radii of the upper elliptical metal patch 1 according to the present embodiment are determined by the operating frequency; the length and the width of the first upper layer rectangular metal patch 2 are obtained through simulation of CST software, the input impedance of the antenna can be matched to 50 omega, the second upper layer rectangular metal patch 3 is a 50 omega microstrip line and is used as a feeder line of the antenna, the width of the second upper layer rectangular metal patch corresponds to the thickness of the middle layer dielectric substrate 5, and the length of the second upper layer rectangular metal patch is 5 mm. The lower metal patch 4 is formed by slotting two sides and the middle of a rectangular metal patch. The upper metal patch and the lower metal patch are respectively etched on the upper surface and the lower surface of the medium substrate. The dielectric constant of the RT/duroid5880 dielectric substrate is 2.2, the loss tangent angle is 0.0009, and the thickness is 0.787 mm.
As shown in fig. 1-2, the lower metal patch 4 has two square slots on two sides to realize omnidirectional radiation of the antenna at higher frequencies.
As shown in fig. 1-2, the lower metal patch 4 has a square slot in the middle to widen the bandwidth of the antenna.
As shown in fig. 3, the rectifier circuit described in this embodiment is in a three-way parallel form, the upper-way matching circuit 6, the schottky diode 10 and the fan-shaped stub band-pass filter 9 are used for rectification (1.8GHz, 2.6GHz), the middle-way matching circuit 7, the zero-bias diode 10 and the fan-shaped stub band-pass filter 9 are used for rectification (2.1GHz, 4.9GHz, 5.8GHz), the lower-way matching circuit 8, the zero-bias diode 10 and the fan-shaped stub band-pass filter 9 are used for rectification (2.4GHz, 3.5GHz), and finally, the three-way synthesis is connected with a resistive load 11 in parallel behind. The rectifying circuit adopts edge microstrip line feed, and the input impedance is 50 omega, is connected to SMA joint.
As shown in fig. 4, the frequency characteristic described in the present embodiment includes a return loss parameter. Wherein the abscissa represents the frequency variable in GHz and the ordinate represents the return loss variable. The test result shows that the broadband omnidirectional monopole antenna has | -S11 | < -10dB and the relative impedance bandwidth of 111.9% in the frequency range of 1.67GHz-5.92GHz, and covers the whole frequency band of 1.7GHz-5.9 GHz.
As shown in fig. 5, the broadband omnidirectional receiving antenna described in this embodiment is shown in a normalized antenna radiation pattern 5 of 1.8GHz, 2.1GHz2.4 GHz, 2.6GHz, 3.5GHz, 4.9GHz, and 5.8GHz, and it can be seen from the figure that the antenna array can well maintain the omnidirectional radiation characteristic of the H plane in the operating band, the E plane radiation pattern is in the shape of "8", and the antenna realizes the omnidirectional radiation characteristic in a wider frequency band.
As shown in fig. 6, the frequency characteristics of the seven-band rectifier circuit according to the present embodiment include a return loss parameter. Wherein the abscissa represents the frequency variation and the ordinate represents the return loss variation. Simulation and test results show that when the input power is-15 dBm, -10dBm and-5 dBm respectively, the rectifying circuit works in seven designed frequency bands and has better return loss.
As shown in fig. 7, the rectification characteristic of the seven-band rectifier circuit according to the present embodiment is rectification efficiency. Wherein the abscissa represents the frequency variation and the ordinate represents the rectification efficiency. The test result shows that the conversion efficiency of the rectifier circuit in each frequency band is 44.4% @1.84GHz, 43.9% @2.04GHz, 45.4% @2.36GHz, 43.4% @2.54GHz, 36.1% @3.3GHz, 32.4% @4.76GHz, 28.3% @5.78GHz respectively, and when the input power is-15 dBm and-5 dBm, the rectifier circuit also has higher conversion efficiency in seven frequency bands.
As shown in fig. 8 and 9, the rectification characteristic of the seven-band rectifier circuit according to the present embodiment is rectification efficiency, where the abscissa represents the input power variation and the ordinate represents the rectification efficiency. The test result shows that the rectifying circuit can work normally in the input power range of-20 dBm to 5 dBm.
The technical scheme of the utility model is not limited to the limitation of the specific examples, for example, the utility model is a broadband omnidirectional antenna working at 1.67-5.92GHz, and the size is changed and can be suitable for other wave bands; the utility model relates to a seven-frequency-band rectifying circuit working in GSM1800(1.8GHz), LTE (2.1GHz), WLAN/Wi-Fi (2.4GHz, 5.8GHz) and 5G (2.6GHz, 3.5GHz and 4.9GHz), and the size of the seven-frequency-band rectifying circuit can be changed to be used in other wave bands.
It will be appreciated that modifications and variations are possible to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (10)
1. A seven-frequency band omnidirectional rectifying antenna is characterized by comprising an antenna unit and a rectifying circuit unit which are connected with each other; the antenna unit is an omnidirectional antenna; the rectifying circuit unit comprises three impedance matching circuits which are connected in parallel, and the receiving radio frequency bands of the impedance matching circuits are different; the three impedance matching circuits are set as double-frequency-band impedance matching circuits of an upper circuit and a lower circuit and a three-frequency-band impedance matching circuit of a middle circuit; the three impedance matching circuits are connected in parallel and then connected in series with the load.
2. The seven-band omnidirectional rectenna of claim 1, wherein the antenna unit comprises an upper metal patch, a middle dielectric substrate and a lower metal patch, wherein the upper metal patch and the lower metal patch are respectively etched on the upper surface and the lower surface of the middle dielectric substrate.
3. The seven-band omnidirectional rectenna of claim 2, wherein the upper metal patches comprise an upper oval metal patch, a first upper rectangular metal patch and a second upper rectangular metal patch which are respectively arranged from top to bottom, wherein the second upper rectangular metal patch is used as a feed line.
4. The seven-band omnidirectional rectenna of claim 3, wherein an SMA connector for connecting the second upper rectangular metal patch and the second lower metal patch is connected below the antenna unit.
5. The seven-band omni-directional rectenna of claim 1, wherein the impedance matching circuit comprises a multi-band impedance matching circuit, a diode, and a band pass filter connected in series.
6. The seven-band omnidirectional rectenna of claim 1, wherein the rectifying circuit units are disposed on a dielectric substrate.
7. The seven-band omnidirectional rectenna as claimed in claim 6, wherein the intermediate layer dielectric substrate and the rectifying circuit dielectric substrate are of the same type, are made of RT/duroid5880 material with a dielectric constant of 2.2, have a loss tangent of 0.0009 and a thickness of 0.787 mm.
8. The seven-band omni-directional rectenna of claim 1, wherein the diode is schottky diode SMS 7630.
9. A seven-band omni-directional rectenna as claimed in claim 1, wherein the operating band of the antenna elements is between 1.67GHz and 5.92 GHz.
10. A seven-band omni-directional rectenna as in claim 5 wherein the bandpass filters are sector stub bandpass filters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220018174.0U CN216750289U (en) | 2022-01-06 | 2022-01-06 | Seven-frequency-band omnidirectional rectifying antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220018174.0U CN216750289U (en) | 2022-01-06 | 2022-01-06 | Seven-frequency-band omnidirectional rectifying antenna |
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| CN216750289U true CN216750289U (en) | 2022-06-14 |
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| CN202220018174.0U Active CN216750289U (en) | 2022-01-06 | 2022-01-06 | Seven-frequency-band omnidirectional rectifying antenna |
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