CN117559103A - Yagi antenna for collecting very high frequency signals of unmanned aerial vehicle - Google Patents
Yagi antenna for collecting very high frequency signals of unmanned aerial vehicle Download PDFInfo
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- CN117559103A CN117559103A CN202311709896.6A CN202311709896A CN117559103A CN 117559103 A CN117559103 A CN 117559103A CN 202311709896 A CN202311709896 A CN 202311709896A CN 117559103 A CN117559103 A CN 117559103A
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- 239000004020 conductor Substances 0.000 claims description 27
- 230000003071 parasitic effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 31
- 239000004033 plastic Substances 0.000 description 19
- 229920003023 plastic Polymers 0.000 description 19
- 230000005855 radiation Effects 0.000 description 12
- 230000007423 decrease Effects 0.000 description 6
- 238000005457 optimization Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- RZVHIXYEVGDQDX-UHFFFAOYSA-N 9,10-anthraquinone Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3C(=O)C2=C1 RZVHIXYEVGDQDX-UHFFFAOYSA-N 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/005—Damping of vibrations; Means for reducing wind-induced forces
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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
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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
-
- 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
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/285—Aircraft wire 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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/28—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements
- H01Q19/30—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a yagi antenna for collecting very high frequency signals on an unmanned plane, which relates to the technical field of wireless communication and is constructed by utilizing an active oscillator, a passive oscillator and a parallel rod, wherein the passive oscillator comprises 6 directors and 1 reflector. Among the 6 directors, two directors are close to the active oscillator, the other four directors are divided into two groups, and the two directors in each group are mutually and vertically connected. The size and the distance between the directors and the reflectors in the yagi antenna and the size and the distance between the parallel rods are adjusted to obtain the yagi antenna meeting the requirements of passband range, standing wave ratio and gain. Unmanned aerial vehicle and support frame with load and wind resistance meeting requirements are selected, and a lift-off yagi antenna carrying platform is constructed. And carrying the constructed yagi antenna on an unmanned aerial vehicle to obtain the unmanned aerial vehicle and a supporting frame with the smallest influence on the antenna performance. The yagi antenna with standing wave ratio smaller than 2, antenna gain larger than 3 and excellent antenna pattern is suitable for collecting very high frequency signals of unmanned aerial vehicle.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a yagi antenna for collecting very high frequency signals on an unmanned plane.
Background
A yagi antenna is a directional antenna that is a parasitic array created by parallel dipoles for creating an end-fire array. Yagi antennas are typically end-fire antennas consisting of an active dipole, a passive reflector and passive directors arranged in parallel.
With the continuous development of technology, yagi antennas are increasingly applied to various wireless communication systems, such as satellite communication, mobile communication, radar systems, and the like. The excellent directivity and high gain characteristics of the yagi antenna enable the transmission distance of wireless signals to be obviously increased, and meanwhile, the problems of signal interference, transmission attenuation and the like are reduced. Thus, yagi antennas have been intensively studied and widely used.
Very high frequency signals generally refer to signals in the frequency band typically ranging from 30MHz to 300MHz, with the wavelength of electromagnetic waves typically being on the order of meters. Very high frequency band signals also typically include natural radio signals (background noise in the universe, the atmosphere, etc.) and artificial radio signals (leakage radiation in power systems, industrial systems, etc.).
Very high frequency bands are very important for television, broadcast communications, and even meter wave radar detection targets. The occurrence of the black frequency signal can cause interference to televisions, broadcast communication and the like, and even can influence the accuracy of a meter wave radar detection target. The VHF signal acquisition can provide data support for subsequent VHF black signal investigation. Therefore, it is necessary to study the vhf band signal measurement.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art and providing the yagi antenna for collecting the very high frequency signals of the unmanned aerial vehicle, analyzing the electrical indexes of the antenna, and obtaining the yagi antenna with standing wave ratio smaller than 2, antenna gain larger than 3 and excellent antenna pattern and suitable for collecting the very high frequency signals of the unmanned aerial vehicle by adjusting parameters such as antenna structure, vibrator number and the like.
The invention adopts the following technical scheme for solving the technical problems:
the invention provides a yagi antenna for collecting a very high frequency signal on an unmanned plane, which comprises a reflector, a folded vibrator, a passive vibrator unit and two parallel rods, wherein the passive vibrator unit comprises N passive vibrators with unequal lengths; wherein,
the reflector, the folded vibrator and the passive vibrator unit are not contacted with the parallel rods, the reflector and the folded vibrator are arranged in planes where the two parallel rods are located, the two parallel rods are respectively located on the left side and the right side of the reflector, the folded vibrator is arranged above the reflector and is parallel to the reflector, the passive vibrator unit is arranged above the folded vibrator, the length of the reflector is longer than that of the passive vibrator, N is more than or equal to 6, at least one pair of passive vibrators which are connected vertically are arranged in the passive vibrator unit, planes formed by the passive vibrators which are connected vertically are vertical to the parallel rods, the rest passive vibrators are parallel to the folded vibrator and are arranged between the two parallel rods, and the distances between the N passive vibrators and the folded vibrator are respectively more and more long.
As a further optimization scheme of the yagi antenna for collecting the very high frequency signals of the unmanned aerial vehicle, N passive oscillators are all called directors, and the folded oscillators are active oscillators.
As a further optimization scheme of the yagi antenna for collecting the very high frequency signals on the unmanned plane, the passive oscillator unit comprises 6 passive oscillators, the 6 passive oscillators are respectively a first passive oscillator, a sixth passive oscillator, a fifth passive oscillator and a sixth passive oscillator, planes formed by the fifth passive oscillator and the sixth passive oscillator which are mutually perpendicular are perpendicular to a parallel rod, the third passive oscillator and the fourth passive oscillator are mutually perpendicular to each other, planes formed by the third passive oscillator and the fourth passive oscillator which are mutually perpendicular are perpendicular to the parallel rod, the first passive oscillator, the second passive oscillator, the third passive oscillator and the fifth passive oscillator are parallel to the folded oscillator, and distances between the sixth passive oscillator, the fifth passive oscillator, the fourth passive oscillator, the third passive oscillator, the second passive oscillator and the first passive oscillator are respectively and gradually close.
As a further optimization scheme of the yagi antenna for collecting the very high frequency signals of the unmanned aerial vehicle, the reflector is a passive vibrator.
As a further optimization scheme of the yagi antenna for collecting the very high frequency signals of the unmanned aerial vehicle, the parallel rods are made of ideal electric conductors.
As a further optimization scheme of the yagi antenna for collecting the very high frequency signals of the unmanned aerial vehicle, the first to the N passive oscillators and the folded oscillators are ideal electric conductors.
As a further optimization scheme of the yagi antenna for collecting the very high frequency signals of the unmanned aerial vehicle, the distance between the parallel rods is set to be 600mm.
The yagi antenna for collecting the very high frequency band signals of the unmanned aerial vehicle is carried on the unmanned aerial vehicle, an unmanned aerial vehicle and a supporting frame are selected, and a lift-off yagi antenna carrying platform is constructed.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects:
(1) The invention adopts the yagi antenna result as a noise measuring antenna. The scheme of the concept of the antenna is conceived, and the structure of the antenna is conceived, so that the appearance structure of the antenna is primarily formed. The structure of the yagi antenna is constructed, the electrical characteristics of the antenna can be analyzed in advance, and the design scheme is optimized continuously according to the antenna parameter requirements. Finally constructing a yagi antenna for measuring VHF frequency band signal interference of the unmanned plane;
(2) And analyzing the antenna electrical index, wherein the distance between the parallel rods is reduced from 800mm to 600mm, and the standing wave ratio is gradually reduced. At a parallel rod spacing of 600mm, the standing wave ratio is less than 2 in the range of 240MHz and in the range of 280 MHz. When the spacing is reduced from 600mm to 500mm, the standing wave ratio rises sharply with increasing frequency, and the gain is greater than 3.
Drawings
Fig. 1 is a yagi antenna with parallel rods.
FIG. 2 is a plot of standing wave ratio of an antenna as a function of frequency; wherein, (a) is an antenna parallel bar pitch of 800mm, (b) is an antenna parallel bar pitch of 700mm, (c) is an antenna parallel bar pitch of 600mm, and (d) is an antenna parallel bar pitch of 500mm.
Fig. 3 shows a plot of standing wave ratio of an antenna as a function of frequency, wherein (a) is an ideal electrical conductor for parallel rod materials, and (b) is polystyrene for parallel rod materials.
Fig. 4 is a diagram of an antenna with 600mm parallel bars spaced from each other and a perfect electrical conductor.
Fig. 5 is a simulated yagi antenna mounted on a simulated drone.
FIG. 6 is a plot of standing wave ratio of an antenna as a function of frequency; wherein (a) is that the unmanned aerial vehicle's fuselage and support frame are the ideal electric conductor, and (b) is that unmanned aerial vehicle's fuselage and support frame are plastics material.
Fig. 7 is an antenna directivity pattern; wherein, (a) is that the material of the simulation unmanned aerial vehicle and the support frame is an ideal electric conductor, and (b) is that the material of the simulation unmanned aerial vehicle and the support frame is plastic.
FIG. 8 is a plot of standing wave ratio of an antenna as a function of frequency; wherein, (a) is the fuselage of the unmanned aerial vehicle and is an ideal electric conductor, the support frame is plastic, and (b) is the fuselage of the unmanned aerial vehicle and is plastic, and the support frame is an ideal electric conductor.
Fig. 9 is an antenna directivity pattern; wherein (a) is that the body of the unmanned aerial vehicle is an ideal electric conductor, and the support frame is plastic; (b) The unmanned aerial vehicle has plastic body and ideal electric conductor as the support frame.
The reference numerals in the figures are explained as: 1-6 are respectively a first passive vibrator, a sixth passive vibrator, 7, 8 are parallel rods, 9 is a reflector, 10 is a folded vibrator, 11-14 are unmanned aerial vehicle supports, and 15 is an unmanned aerial vehicle body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The unmanned aerial vehicle lift-off platform is used for carrying the yagi antenna on the unmanned aerial vehicle, and can measure the very high frequency band signals of different heights, so that data support is provided for monitoring the very high frequency band signals under different heights. The selected unmanned aerial vehicle has good flight control system and gesture stability, and ensures that the yagi antenna always keeps stable direction and gesture in the flight process of the unmanned aerial vehicle, thereby ensuring the stability of the received signal gain of the antenna and the continuity of data. The unmanned aerial vehicle is provided with a GPS positioning module and a track recording module, and can record detailed and accurate track information of the unmanned aerial vehicle. And constructing a brand new very high frequency band signal data structure by using the track information and the signal data.
And downloading the constructed new data to a computer platform, and analyzing the power spectrum of the very high frequency signal by using a computer. And judging whether the current channel has a black frequency signal or not by observing the change of the power spectrum density curve of the signal.
The invention adopts the yagi antenna result as a noise measuring antenna. The scheme of the concept of the antenna is conceived, and the structure of the antenna is conceived, so that the appearance structure of the antenna is primarily formed. The structure of the yagi antenna is constructed, the electrical characteristics of the antenna can be analyzed in advance, and the design scheme is optimized continuously according to the antenna parameter requirements. Finally, the yagi antenna for measuring the VHF frequency band signal interference of the unmanned plane is constructed. The method comprises the following steps:
s1, improving a yagi antenna structure, and designing the yagi antenna by using an active oscillator reflector and a director.
S2, reducing the standing wave ratio of the antenna by using the number, the size and the position of the active vibrators and the spacing and the material of the parallel rods, and improving the gain of the antenna.
And S3, carrying the yagi antenna on the unmanned aerial vehicle, and analyzing the performance of the yagi antenna on the unmanned aerial vehicle.
S4, under the influence of the antenna electrical index, when the parallel rod spacing is 600mm, the standing wave ratio is smaller than 2 in the range of 240MHz and the range of 280MHz, and the performance is superior to other spacing.
In step S1, a yagi antenna is designed. The yagi antenna is designed with active elements, reflectors, directors and parallel rods, as shown in fig. 1. The folded vibrator is adopted as an active vibrator (the size information is 32mm multiplied by 525 mm), so that the input impedance of the antenna is improved, and the antenna is better matched with the impedance of a feeder line. The number of the passive oscillators is six, and the lengths of the first to sixth passive oscillators 1 to 6 close to the folded oscillator 10 are 454mm, 450mm and 450mm in sequence. The longest element is called the reflector and the six passive elements are called directors. An antenna architecture is improved wherein a third parasitic element is orthogonal to a fourth parasitic element and a fifth parasitic element is orthogonal to a sixth parasitic element. The rods on both sides of the antenna are parallel rods 7, 8 (size: 20 mm. Times.20 mm. Times.900 mm) for fixing the antenna. The thin rod in the middle of the parallel rod is the oscillator of the yagi antenna, the length of the longest oscillator is 1mm multiplied by 600mm, and the longest oscillator is slightly longer than half wavelength, and is not contacted with the parallel rod and is used as a reflector 9. The reflector length of the antenna was 0.6 meter, and the parallel rods were spaced 1mm up and down without contact with the reflector.
And verifying the curves of the standing wave ratio of the antenna with the change of frequency at 800mm, 700mm, 600mm and 500mm of the parallel rods. The standing wave ratio gradually decreases as the parallel rod spacing decreases from 800mm to 600mm. At a parallel rod spacing of 600mm, the standing wave ratio is less than 2 in the range of 240MHz and in the range of 280 MHz. When the spacing is reduced from 600mm to 500mm, the standing wave ratio increases sharply with increasing frequency, and the antenna performance decreases sharply. Therefore, in designing the antenna, it is preferable to set the parallel rod pitch to 600mm.
And continuously adjusting the antenna material on the basis that the space between the antenna parallel rods is 600mm. Two materials that can be considered are an ideal electrical conductor and polystyrene, which is commonly known as a thermoplastic. Under the condition of two different materials, the standing wave ratio of the antenna changes along with the increase of frequency, and when the parallel rod material is plastic, the standing wave ratio of the antenna increases greatly, and the antenna performance is rapidly deteriorated. When the space between the antenna parallel rods is 600mm and the antenna material is an ideal electric conductor, the standing wave of the antenna is approximately satisfied with the standing wave ratio less than 2, and at the moment, the antenna pattern is best, the radiation direction of the antenna energy is definite, and most of energy can be radiated to the front of the antenna.
In step S2, unmanned aerial vehicle with high cost performance meeting the requirement is selected, and a corresponding unmanned aerial vehicle supporting frame is designed. Combining the signal measurement actual demand, unmanned aerial vehicle parameter requirements, after-sales service guarantee, technical guidance and the like, and selecting the unmanned aerial vehicle with the highest cost performance. And combining the size of the yagi antenna and the size of the unmanned aerial vehicle, and designing a support frame with proper size.
In step S3, the antenna is mounted on the unmanned plane platform and rises to more than hundred meters to collect the very high frequency signals. The influence of the unmanned aerial vehicle body material and the unmanned aerial vehicle support frame material on the yagi antenna standing wave ratio and gain is analyzed, and the effect that the antenna standing wave ratio changes along with the frequency when the unmanned aerial vehicle body material is respectively an ideal electric conductor and a plastic material in the frequency band range from 240MHz to 280MHz is given. The antenna radiation pattern is best when the unmanned aerial vehicle body and the supporting frame are both made of plastics.
And in the step S4, the antenna electrical index is analyzed, the distance between the parallel rods is reduced from 800mm to 600mm, and the standing wave ratio is gradually reduced. At a parallel rod spacing of 600mm, the standing wave ratio is less than 2 in the range of 240MHz and in the range of 280 MHz. When the spacing is reduced from 600mm to 500mm, the standing wave ratio rises sharply with increasing frequency, and the gain is greater than 3.
When the invention is embodied, the designed yagi antenna is verified to meet the standing-wave ratio and gain requirements in the very high frequency band signal acquisition process, and the optimal distance and material in the frequency band and the optimal material of the carried unmanned aerial vehicle.
Simulation verifies that the standing wave ratio of the antenna changes with frequency when the parallel rods are 800mm, 700mm, 600mm and 500mm. Comparing (a) in fig. 2, and (b) in fig. 2 and (c) in fig. 2, it can be seen that the standing wave ratio gradually decreases as the parallel rod spacing decreases from 800mm to 600mm. At a parallel rod spacing of 600mm, the standing wave ratio is less than 2 in the range of 240MHz to 280 MHz.
As can be seen from comparison of fig. 2 (c) and fig. 2 (d), when the pitch is reduced from 600mm to 500mm, the standing wave ratio increases sharply with increasing frequency, and the antenna performance decreases sharply.
Therefore, in designing the antenna, it is preferable to set the parallel rod pitch to 600mm.
And continuously adjusting the parallel rod materials on the basis that the space between the parallel rods of the antenna is 600mm. Two materials that can be considered are an ideal electrical conductor and polystyrene, which is commonly known as a thermoplastic. Fig. 3 (a) and fig. 3 (b) show curves of the standing wave ratio of the antenna as the frequency increases when the parallel rod material is an ideal electric conductor and plastic, respectively. As can be seen from fig. 3, when the parallel rods are ideal electrical conductors, the standing wave of the antenna approximately satisfies a standing wave ratio of less than 2. When the parallel rods are made of plastic, the standing wave ratio of the antenna is greatly increased, and the performance of the antenna is rapidly deteriorated. Therefore, the antenna material selects the ideal electrical conductor.
As can be seen from fig. 4, when the antenna parallel rod distance is 600mm and the antenna parallel rod material is an ideal electric conductor, the antenna pattern is best, the radiation direction of the antenna energy is clear, and most of the energy can be radiated to the front of the antenna. This verifies that the parallel rod spacing and material selection is correct.
The simulation yagi antenna with the parallel rods is loaded on the unmanned aerial vehicle, as shown in fig. 5, 11-14 are unmanned aerial vehicle supporting frames, and 15 is an unmanned aerial vehicle body.
Fig. 6 (a) and fig. 6 (b) show curves of standing wave ratio of the antenna according to frequency when the material of the unmanned aerial vehicle body is respectively an ideal electric conductor and a plastic material. As can be seen from comparing fig. 6 (a) with fig. 6 (b), in the frequency band range from 240MHz to 280MHz, when the material of the unmanned aerial vehicle body is plastic, the standing wave ratio of the antenna is lower as a whole.
Fig. 7 (a) and fig. 7 (b) show the directivity pattern of the antenna radiation when the simulated drone carrier material is a perfect electrical conductor and plastic, respectively. As can be seen from comparing fig. 7 (a) with fig. 7 (b), when the support frame of the unmanned aerial vehicle is an ideal electric conductor, the radiation direction of the antenna is obviously changed, the radiation capability is not concentrated in front of the antenna, and the total gain of the antenna is reduced. As can be seen from the combination of (a) in fig. 6 and 7 and (b) in fig. 7, the standing wave ratio of the antenna is lower and the energy radiation direction is better when the unmanned aerial vehicle body and the supporting frame are made of plastic materials.
Further, analysis is also needed, and when the materials of the unmanned aerial vehicle body and the supporting frame are different, the influence on the standing wave ratio and the radiation direction of the antenna is caused. Fig. 8 (a) and 8 (b) show curves of the standing wave ratio of the antenna as a function of frequency, in which the body is an ideal electrical conductor and the support frame is plastic, and in which the body is plastic and the support frame is an ideal electrical conductor. The antenna direction radiation patterns corresponding to (a) in fig. 8 and (b) in fig. 8 are given in (a) in fig. 9 and (b) in fig. 9.
As can be seen from fig. 8 and 9, when the materials of the unmanned aerial vehicle body and the supporting frame are different, the antenna radiation directivity is not as good as that shown in (b) of fig. 7, which indicates that the antenna radiation directivity pattern is better when the unmanned aerial vehicle body and the supporting frame are both made of plastics.
In summary, the antenna material is an ideal electrical conductor. The space between the parallel rods of the antenna is 600mm, and the parallel rods are made of ideal electric conductors. The unmanned aerial vehicle fuselage and the support frame material are plastics.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.
Claims (8)
1. The yagi antenna for collecting the very high frequency signal of the unmanned aerial vehicle is characterized by comprising a reflector, a folded vibrator, a passive vibrator unit and two parallel rods, wherein the passive vibrator unit comprises N passive vibrators with unequal lengths; wherein,
the reflector, the folded vibrator and the passive vibrator unit are not contacted with the parallel rods, the reflector and the folded vibrator are arranged in planes where the two parallel rods are located, the two parallel rods are respectively located on the left side and the right side of the reflector, the folded vibrator is arranged above the reflector and is parallel to the reflector, the passive vibrator unit is arranged above the folded vibrator, the length of the reflector is longer than that of the passive vibrator, N is more than or equal to 6, at least one pair of passive vibrators which are connected vertically are arranged in the passive vibrator unit, planes formed by the passive vibrators which are connected vertically are vertical to the parallel rods, the rest passive vibrators are parallel to the folded vibrator and are arranged between the two parallel rods, and the distances between the N passive vibrators and the folded vibrator are respectively more and more long.
2. The yagi antenna of claim 1, wherein N passive elements are all called directors, and the folded element is an active element.
3. The yagi antenna of claim 1, wherein the passive unit comprises 6 passive elements, the 6 passive elements are respectively a first passive element to a sixth passive element, the fifth passive element and the sixth passive element are mutually perpendicular, a plane formed by the mutually perpendicular fifth passive element and the sixth passive element is perpendicular to a parallel rod, the third passive element and the fourth passive element are mutually perpendicular, a plane formed by the mutually perpendicular third passive element and the fourth passive element is perpendicular to the parallel rod, the first passive element, the second passive element, the third passive element and the fifth passive element are parallel to a folded element, and distances between the sixth passive element, the fifth passive element, the fourth passive element, the third passive element, the second passive element and the first passive element and the folded element are respectively and gradually close.
4. The yagi antenna of claim 1 wherein the reflector is a passive element.
5. The yagi antenna of claim 1 wherein the parallel rods are made of a perfect electrical conductor.
6. The yagi antenna of claim 1 wherein the first through N-th parasitic elements and the folded dipole are perfect electrical conductors.
7. A yagi antenna for the acquisition of very high frequency signals on board an unmanned aircraft according to claim 1, wherein the spacing between the parallel rods is set to 600mm.
8. The yagi antenna for collecting the very high frequency band signals of the unmanned aerial vehicle is characterized in that the yagi antenna of claim 1 is mounted on the unmanned aerial vehicle, an unmanned aerial vehicle and a supporting frame are selected, and a lift-off yagi antenna mounting platform is constructed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311709896.6A CN117559103A (en) | 2023-12-13 | 2023-12-13 | Yagi antenna for collecting very high frequency signals of unmanned aerial vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311709896.6A CN117559103A (en) | 2023-12-13 | 2023-12-13 | Yagi antenna for collecting very high frequency signals of unmanned aerial vehicle |
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| Publication Number | Publication Date |
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| CN117559103A true CN117559103A (en) | 2024-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311709896.6A Pending CN117559103A (en) | 2023-12-13 | 2023-12-13 | Yagi antenna for collecting very high frequency signals of unmanned aerial vehicle |
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- 2023-12-13 CN CN202311709896.6A patent/CN117559103A/en active Pending
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