CN210380814U - Filter circuit for effectively inhibiting electromagnetic radiation of radio-frequency antenna of multi-rotor mooring unmanned aerial vehicle - Google Patents
Filter circuit for effectively inhibiting electromagnetic radiation of radio-frequency antenna of multi-rotor mooring unmanned aerial vehicle Download PDFInfo
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- CN210380814U CN210380814U CN201922197973.XU CN201922197973U CN210380814U CN 210380814 U CN210380814 U CN 210380814U CN 201922197973 U CN201922197973 U CN 201922197973U CN 210380814 U CN210380814 U CN 210380814U
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Abstract
The utility model discloses a filter circuit for effectively inhibiting electromagnetic radiation of a radio frequency antenna of a multi-rotor tethered unmanned aerial vehicle, which has the advantages that the input end of the filter circuit is connected with a GPS antenna carrier signal of the multi-rotor tethered unmanned aerial vehicle, and the output end of the filter circuit is connected with a GPS antenna, the filter circuit comprises a band-pass filter and a low-pass filter, and the band-pass filter and the low-pass filter are connected in parallel; the band-pass filter is used for separating radio frequency signals in the GPS antenna signals; the low-pass filter is used for separating the direct-current power supply signal in the GPS antenna signal; the low-pass filter adopts a T-shaped low-pass filter, and the band-pass filter adopts an LC band-pass filter. The utility model discloses antenna filter design circuit is the passive filter circuit, possesses simply, reliably and can effectively restrain the electromagnetic interference signal that mooring unmanned aerial vehicle during operation leaks and enlargies through the antenna interface, and reinforcing unmanned aerial vehicle interference killing feature reduces the radiation interference to task load or space.
Description
Technical Field
The utility model relates to a many rotors tie down unmanned aerial vehicle radio frequency antenna electromagnetic radiation's filtering technology field especially relates to the filter circuit who effectively restraines many rotors and tie down unmanned aerial vehicle radio frequency antenna electromagnetic radiation.
Background
At present, many rotors mooring unmanned aerial vehicle is on ordinary many rotors unmanned aerial vehicle external mooring machine carries power and the compound cable connection ground power of mooring of ultra-light type photoelectricity, replaces original airborne battery to can hang the shutdown work for a long time stagnation. The multi-rotor mooring unmanned aerial vehicle has the advantages of long dead time, high data transmission speed, short deployment time and the like, and is widely applied to the fields of photoelectric reconnaissance, communication relay, electronic countermeasure and the like. The operating characteristic of the multi-rotor mooring unmanned aerial vehicle is high-voltage and high-current, wherein the voltage of a mooring cable is up to 1200V, a multi-rotor motor needs to continuously rotate at high speed, and the power of the whole unmanned aerial vehicle is dozens of kilowatts, so that the space radiation interference of the unmanned aerial vehicle is very large, and the carried load, particularly the acting distance of a communication load, of the unmanned aerial vehicle is seriously influenced, and even the unmanned aerial vehicle can normally work. Therefore, it is necessary and significant to research the electromagnetic compatibility of the multi-rotor tethered drone.
At present, the industry of the tethered unmanned aerial vehicle at home and abroad is still at a starting level, and the tethered unmanned aerial vehicle is designed by adopting the following technical means that a ① unmanned aerial vehicle body is usually made of aviation aluminum or magnesium-aluminum alloy materials, electromagnetic radiation interference of electronic components in the body is shielded through a metal shell, an opening gap of the shell is sealed by adopting proper sealing conductive materials, a cable in the ② unmanned aerial vehicle body is double-layer shielded and surrounds the cable at 360 degrees, a light special filter is additionally arranged at a ③ high-voltage input end, a filter capacitor is additionally arranged between each power input and output of ④ and a motor electric regulator, a honeycomb waveguide window is additionally arranged at a ⑤ ventilation radiating hole, and the electromagnetic compatibility of the unmanned aerial vehicle is improved to a certain extent by the technical means.
Owing to receive the restriction of unmanned aerial vehicle fuselage weight and volume, and consider the radiating validity of unmanned aerial vehicle, several kinds of above-mentioned electromagnetic compatibility design measures often can not be implemented well, lead to the unable complete filtering of inside electromagnetic interference signal of unmanned aerial vehicle and shield to leak through radio frequency antenna interface, ventilation and heat dissipation hole, wire lead-out hole, riveted joint seam etc. department, because of unmanned aerial vehicle can't provide good ground plane again, lead to disturbing unable in time releasing. In practical tests, it was found that even on drones with the above described electromagnetic compatibility design, the electromagnetic leakage is very severe, and the place where the electromagnetic leakage is most severe is the leakage at the GPS antenna interface. The reason is that the antenna generates an antenna effect on the interference level, and after the interference level is amplified by the antenna, if the frequency of the interference balance is just close to the working frequency band of the carried task load, the normal work of the task load is seriously interfered, so that the faults of video image interference, unstable communication distance and the like are caused, and the expandable field of the unmanned aerial vehicle is seriously limited.
Because the existing industry of the tethered unmanned aerial vehicle is still at the starting level, no public report is available for performing electromagnetic compatibility processing on a GPS antenna interface.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the GPS antenna carrier signal based on the multi-rotor tethered unmanned aerial vehicle not only contains a direct current power supply signal, but also contains a radio frequency signal, the filtering of the radio frequency signal on the antenna interface by adopting a conventional radio frequency filter is equivalent to the direct filtering of the direct current power supply signal, and the antenna can not work at all; and at present, the multi-rotor mooring unmanned aerial vehicle does not carry out electromagnetic compatibility processing on a GPS antenna interface, so that the unmanned aerial vehicle is large in electromagnetic interference, unstable and reliable in mounted communication reconnaissance task load work and limited in use. The utility model provides a solve the filter circuit of the many rotors of effective suppression mooring unmanned aerial vehicle radio frequency antenna electromagnetic radiation of above-mentioned problem.
The utility model discloses a following technical scheme realizes:
the filter circuit effectively inhibits the electromagnetic radiation of the radio-frequency antenna of the multi-rotor tethered unmanned aerial vehicle, the input end of the filter circuit is connected to a carrier signal (namely a GPS board radio-frequency signal output port) of a GPS antenna of the multi-rotor tethered unmanned aerial vehicle, the output end of the filter circuit is connected to the GPS antenna, the filter circuit comprises a band-pass filter and a low-pass filter, and the band-pass filter and the low-pass filter are connected in parallel; the band-pass filter is used for separating radio frequency signals in the GPS antenna signals; the low-pass filter is used for separating the direct-current power supply signal in the GPS antenna signal; the separated power supply signal and the GPS radio frequency signal are recombined into a clean and effective radio frequency working signal by combining the band-pass filter and the low-pass filter.
The utility model discloses a theory of operation is: based on that a GPS antenna carrier signal on the multi-rotor tethered unmanned aerial vehicle contains both a direct-current power supply signal and a radio-frequency signal, filtering the radio-frequency signal on an antenna interface by adopting a conventional radio-frequency filter is equivalent to directly filtering the direct-current power supply signal, and the antenna cannot work at all; and at present, the multi-rotor mooring unmanned aerial vehicle does not carry out electromagnetic compatibility processing on a GPS antenna interface, so that the unmanned aerial vehicle is large in electromagnetic interference, unstable and reliable in mounted communication reconnaissance task load work and limited in use. The utility model adopts the above scheme to compound band pass filter and low pass filter together, low pass filter separates the DC power supply signal in with GPS antenna signal, band pass filter separates the radio frequency signal in with GPS antenna signal, the clean effectual radio frequency operating signal of resynthesis of the power signal and the GPS radio frequency signal that will separate like this, guarantee basically harmless GPS operating frequency signal that has restoreed, and carried out the decay by a wide margin to the interference signal of other frequency channels, thereby effectively restrained because antenna interface leaks and the interference signal on coupling to antenna interface.
The utility model discloses can effectively restrain the electromagnetic interference who leaks away through many rotors mooring unmanned aerial vehicle GPS difference antenna radio frequency mouth, make electromagnetic radiation interference can not couple to the task load that carries on through antenna gain amplification back, disturb the normal signal in the task load working frequency channel, reduce unmanned aerial vehicle electromagnetic radiation interference to the outside; the utility model discloses can effectively restrain and tie down the electromagnetic interference who comes in through many rotors GPS difference antenna radio frequency mouth for external electromagnetic radiation interference coupling to unmanned aerial vehicle through antenna gain amplification disturbs the normal operating signal level of unmanned aerial vehicle, improves unmanned aerial vehicle self's interference killing feature.
The utility model discloses antenna filter design circuit is the passive filter circuit, possesses simply, reliably and can effectively restrain the electromagnetic interference signal that mooring unmanned aerial vehicle during operation leaks and enlargies through the antenna interface, and reinforcing unmanned aerial vehicle interference killing feature reduces the radiation interference to task load or space.
Preferably, the band pass filter is an LC type band pass filter.
Preferably, the band-pass filter includes electric capacity C1, inductance L1, electric capacity C2 and inductance L2, input many rotors of electric capacity C1's one end is connected and is moored unmanned aerial vehicle GPS antenna carrier signal, the other end and connect inductance L1, inductance L1 connects output GPS antenna, inductance L1 and output GPS antenna's common port, the other end ground connection are connected to inductance L2's one end, and electric capacity C2 connects in parallel on inductance L2.
Preferably, the capacitance of the capacitor C1 is 27pF, the inductance of the inductor L1 is 18nH, the capacitance of the capacitor C2 is 7pF, and the inductance of the inductor L2 is 68 nH.
Preferably, the low-pass filter is a T-type low-pass filter.
Preferably, the low-pass filter comprises an inductor L3, a capacitor C3, an inductor L4 and a capacitor C4, one end of the inductor L3 is connected with an input-end multi-rotor tethered unmanned aerial vehicle GPS antenna carrier signal, the other end of the inductor L3 is connected with an inductor L4, an inductor L4 is connected with an output-end GPS antenna, one end of the capacitor C3 is connected with a common end of the inductor L3 and the inductor L4, the other end of the capacitor C3 is grounded, and the capacitor C4 and the capacitor C3 are connected in parallel.
Preferably, the inductance of the inductor L3 is 6.8 muH, the capacitance of the capacitor C3 is 1 muF, the inductance of the inductor L4 is 6.8 muH, and the capacitance of the capacitor C4 is 1200 pF.
Preferably, the filter circuit is suitable for being used on a GPS antenna interface of the multi-rotor tethered drone.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model discloses effectively restrain many rotors and tie filtering circuit of unmanned aerial vehicle radio frequency antenna electromagnetic radiation, compound band pass filter and low pass filter together, low pass filter separates the DC power supply signal in the GPS antenna signal, band pass filter separates the radio frequency signal in the GPS antenna signal, synthesize clean effectual radio frequency operating signal again with the power signal who separates like this and GPS radio frequency signal, guarantee basically harmless GPS operating frequency signal of having restoreed, and carried out the attenuation by a wide margin to the interference signal of other frequency channels, thereby effectively restrained because antenna interface leaks the interference signal that couples to antenna interface;
2. the utility model discloses effectively restrain many rotors and tie filtering circuit of unmanned aerial vehicle radio frequency antenna electromagnetic radiation, the utility model discloses antenna filter design circuit is passive filter circuit, possesses simply, reliably and can effectively restrain and tie the electromagnetic interference signal that unmanned aerial vehicle during operation leaked and enlargeing through the antenna interface, strengthens unmanned aerial vehicle interference killing feature, reduces the radiation interference to task load or space.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic block diagram of the antenna filter design according to the present invention.
Fig. 2 is the utility model discloses effectively restrain many rotors and tie down unmanned aerial vehicle radio frequency antenna electromagnetic radiation's filter circuit diagram.
Fig. 3 is a test chart of the RE102 before the antenna filter of the present invention is installed.
Fig. 4 is a RE102 test chart after the antenna filter of the present invention is installed.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Examples
As shown in fig. 1 to 4, the utility model discloses effectively restrain many rotors mooring unmanned aerial vehicle radio frequency antenna electromagnetic radiation's filter circuit, filter circuit's input Vin inserts many rotors mooring unmanned aerial vehicle GPS antenna carrier signal (being GPS integrated circuit board radio frequency signal output port), output Vout connects out and gives the GPS antenna, filter circuit includes band-pass filter and low pass filter, parallel connection between band-pass filter and the low pass filter; the band-pass filter is used for separating radio frequency signals in the GPS antenna signals; the low-pass filter is used for separating the direct-current power supply signal in the GPS antenna signal; the separated power supply signal and the GPS radio frequency signal are recombined into a clean and effective radio frequency working signal by combining the band-pass filter and the low-pass filter.
In this embodiment, band pass filter adopts LC type band pass filter, band pass filter includes electric capacity C1, inductance L1, electric capacity C2 and inductance L2, input many rotors mooring unmanned aerial vehicle GPS antenna carrier signal is connected to electric capacity C1's one end, inductance L1 is connected to the other end, inductance L1 connects output GPS antenna, inductance L1 and output GPS antenna's common port, other end ground connection are connected to inductance L2's one end, and electric capacity C2 connects in parallel on inductance L2.
Specifically, the method comprises the following steps: the capacitance of the capacitor C1 is 27pF, the inductance of the inductor L1 is 18nH, the capacitance of the capacitor C2 is 7pF, and the inductance of the inductor L2 is 68 nH.
In this embodiment, the low pass filter adopts T type low pass filter, the low pass filter includes inductance L3, electric capacity C3, inductance L4 and electric capacity C4, the many rotor mooring unmanned aerial vehicle GPS antenna carrier signal of input end is connected to inductance L3's one end, inductance L4 is connected to the other end, inductance L4 connects output terminal GPS antenna, inductance L3 and inductance L4's common terminal, the other end ground connection are connected to electric capacity C3 one end, electric capacity C4 and electric capacity C3 are in parallel together.
Specifically, the method comprises the following steps: the inductance of the inductor L3 is 6.8 muH, the capacitance of the capacitor C3 is 1 muF, the inductance of the inductor L4 is 6.8 muH, and the capacitance of the capacitor C4 is 1200 pF.
As shown in fig. 1 and fig. 2, by the above circuit structure design, the passband frequency of the band-pass filter is 1200MHz to 1650MHz, the in-band insertion loss is less than or equal to 1dB, and the out-band rejection can reach: DC-200 MHz is more than or equal to 40dB, 200-800 MHz is more than or equal to 30dB, 800-1000 MHz is more than or equal to 20dB, and the standing-wave ratio is as follows: less than or equal to 1.4.
As shown in fig. 3 and 4, fig. 3 is a RE102 test chart before the antenna filter is installed, fig. 4 is a RE102 test chart after the antenna filter is installed, and the comparison test before and after the antenna filter is installed on the unmanned aerial vehicle shows that the antenna filter has an obvious effect of suppressing the electromagnetic radiation interference of the unmanned aerial vehicle.
The working principle is as follows: the utility model discloses compound band pass filter and low pass filter together, low pass filter separates the DC power supply signal in with GPS antenna signal, band pass filter separates the radio frequency signal in with GPS antenna signal, the clean effectual radio frequency operating signal of signal and GPS radio frequency resynthesis that will separate like this, guarantee basically harmless reduction GPS operating frequency signal, and carried out the decay by a wide margin to the interference signal of other frequency channels, thereby effectively restrained because antenna interface leaks and the interference signal on the coupling antenna interface. The utility model discloses filter circuit is applicable to and uses on many rotors moored unmanned aerial vehicle's GPS antenna interface; the utility model discloses can effectively restrain the electromagnetic interference who leaks away through many rotors mooring unmanned aerial vehicle GPS difference antenna radio frequency mouth, make electromagnetic radiation interference can not couple to the task load that carries on through antenna gain amplification back, disturb the normal signal in the task load working frequency channel, reduce unmanned aerial vehicle electromagnetic radiation interference to the outside; the utility model discloses can effectively restrain and tie down the electromagnetic interference who comes in through many rotors GPS difference antenna radio frequency mouth for external electromagnetic radiation interference coupling to unmanned aerial vehicle through antenna gain amplification disturbs the normal operating signal level of unmanned aerial vehicle, improves unmanned aerial vehicle self's interference killing feature.
The utility model discloses antenna filter design circuit is the passive filter circuit, possesses simply, reliably and can effectively restrain the electromagnetic interference signal that mooring unmanned aerial vehicle during operation leaks and enlargies through the antenna interface, and reinforcing unmanned aerial vehicle interference killing feature reduces the radiation interference to task load or space.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The filter circuit is characterized in that the input end of the filter circuit is connected to a GPS antenna carrier signal of the multi-rotor tethered unmanned aerial vehicle, the output end of the filter circuit is connected to the GPS antenna, the filter circuit comprises a band-pass filter and a low-pass filter, and the band-pass filter and the low-pass filter are connected in parallel; the band-pass filter is used for separating radio frequency signals in the GPS antenna signals; and the low-pass filter is used for separating the direct-current power supply signal in the GPS antenna signal.
2. The filter circuit for effectively suppressing electromagnetic radiation from a radio frequency antenna of a multi-rotor tethered drone of claim 1 wherein said bandpass filter is an LC bandpass filter.
3. The filter circuit for effectively suppressing the electromagnetic radiation of the radio frequency antenna of the multi-rotor tethered drone of claim 2, wherein the band-pass filter comprises a capacitor C1, an inductor L1, a capacitor C2 and an inductor L2, one end of the capacitor C1 is connected to the carrier signal of the GPS antenna of the input multi-rotor tethered drone, the other end of the capacitor C1 is connected to the inductor L1 is connected to the GPS antenna of the output, one end of the inductor L2 is connected to the common terminal of the inductor L1 and the GPS antenna of the output, the other end of the inductor L2 is connected to the ground, and the capacitor C2 is connected in parallel to the inductor L2.
4. The filter circuit for effectively suppressing electromagnetic radiation from a radio frequency antenna of a multi-rotor tethered drone of claim 3 wherein the capacitance of the capacitor C1 is 27pF, the inductance of the inductor L1 is 18nH, the capacitance of the capacitor C2 is 7pF, and the inductance of the inductor L2 is 68 nH.
5. The filter circuit for effectively suppressing electromagnetic radiation from a radio frequency antenna of a multi-rotor tethered drone of claim 1 wherein said low pass filter is a T-type low pass filter.
6. The filter circuit for effectively suppressing the electromagnetic radiation of the radio frequency antenna of the multi-rotor tethered drone of claim 5, wherein the low pass filter comprises an inductor L3, a capacitor C3, an inductor L4 and a capacitor C4, wherein one end of the inductor L3 is connected to the carrier signal of the GPS antenna of the input multi-rotor tethered drone, the other end of the inductor L4 is connected to the carrier signal of the GPS antenna, the inductor L4 is connected to the GPS antenna of the output, one end of the capacitor C3 is connected to the common end of the inductor L3 and the inductor L4, the other end of the capacitor C4 is connected to the capacitor C3 in parallel.
7. The filter circuit for effectively suppressing electromagnetic radiation from a radio frequency antenna of a multi-rotor tethered drone of claim 6 wherein the inductance of inductor L3 is 6.8 μ H, the capacitance of capacitor C3 is 1 μ F, the inductance of inductor L4 is 6.8 μ H, and the capacitance of capacitor C4 is 1200 pF.
8. The filter circuit for effectively suppressing electromagnetic radiation from a radio frequency antenna of a multi-rotor tethered drone of claim 1 wherein the filter circuit is adapted for use on a GPS antenna interface of a multi-rotor tethered drone.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922197973.XU CN210380814U (en) | 2019-12-10 | 2019-12-10 | Filter circuit for effectively inhibiting electromagnetic radiation of radio-frequency antenna of multi-rotor mooring unmanned aerial vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922197973.XU CN210380814U (en) | 2019-12-10 | 2019-12-10 | Filter circuit for effectively inhibiting electromagnetic radiation of radio-frequency antenna of multi-rotor mooring unmanned aerial vehicle |
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| CN210380814U true CN210380814U (en) | 2020-04-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830061A (en) * | 2019-12-10 | 2020-02-21 | 中国兵器装备集团自动化研究所 | Filter circuit for effectively inhibiting electromagnetic radiation of radio-frequency antenna of multi-rotor mooring unmanned aerial vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110830061A (en) * | 2019-12-10 | 2020-02-21 | 中国兵器装备集团自动化研究所 | Filter circuit for effectively inhibiting electromagnetic radiation of radio-frequency antenna of multi-rotor mooring unmanned aerial vehicle |
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Effective date of registration: 20210408 Address after: 621000 building 31, No.7, Section 2, Xianren Road, Youxian District, Mianyang City, Sichuan Province Patentee after: China Ordnance Equipment Group Automation Research Institute Co.,Ltd. Address before: 621000 Mianyang province Sichuan City Youxian District Road No. 7 two immortals Patentee before: China Ordnance Equipment Group Automation Research Institute |