CN213366791U - Miniaturized high-gain flexible antenna - Google Patents
Miniaturized high-gain flexible antenna Download PDFInfo
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- CN213366791U CN213366791U CN202022132514.6U CN202022132514U CN213366791U CN 213366791 U CN213366791 U CN 213366791U CN 202022132514 U CN202022132514 U CN 202022132514U CN 213366791 U CN213366791 U CN 213366791U
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Abstract
The utility model discloses a miniaturized high-gain flexible antenna. The utility model comprises a plurality of radiation patches with different shapes printed on a medium substrate and a flexible cable loaded on the medium substrate; and slotting the dielectric substrate, and printing a first radiation patch around the dielectric substrate so as to fix the flexible cable on the dielectric substrate. The size and the weight of the whole structure are effectively reduced while the performance of the antenna is ensured, and meanwhile, a symmetrical coplanar waveguide structure is adopted, so that a gap is formed, an effective path of current is increased, and the transmission and the coupling of signals are completed. The antenna thus achieves a compact, high gain, and low cost design.
Description
Technical Field
The utility model belongs to the technical field of radio frequency/microwave/millimeter wave, especially, relate to the antenna that utilizes the flexible cable design.
Background
In recent years, the application of drones in the fields of communication, military, industrial and commercial markets has attracted a great deal of attention, and they are widely used for exploration, monitoring and multimedia communication, while antennas enable communication between drones and ground stations. At present, the flight time of unmanned aerial vehicles is quite limited, and the antenna with the larger size occupies the larger space of the unmanned aerial vehicle and reduces the endurance time of the unmanned aerial vehicle. In addition, the resistance in the air will be very big to the degree of difficulty of control unmanned aerial vehicle direction has been increased. Due to these factors, the miniaturized antenna has certain advantages. Meanwhile, in order to obtain faster and more stable data and image transmission in drone applications, the radiation pattern of the antenna is generally required to be omnidirectional in the horizontal plane. And its radiation pattern of most present antennas and size miniaturization are difficult for satisfying simultaneously generally, and the gain of most antennas of current application on unmanned aerial vehicle is lower.
Disclosure of Invention
The utility model aims to solve current antenna radiation pattern and the miniaturized unmanned aerial vehicle application requirement that hardly satisfies simultaneously of size, and generally use the less problem of antenna gain on unmanned aerial vehicle, design a miniaturized high-gain flexible unmanned aerial vehicle antenna. The antenna has higher gain, omnidirectional radiation pattern on the horizontal plane, small size of the whole structure, light weight, low cost and easy integration.
The utility model adopts the technical scheme as follows:
a miniaturized high-gain flexible antenna comprises a dielectric substrate (1), a flexible cable (3) and a plurality of radiation patches which are printed on one surface of the dielectric substrate (1) and have different shapes;
one end of the medium substrate (1) is provided with a through groove with one open end, and the through groove is used for placing one end of the flexible cable (3); the upper surface and the lower surface of the dielectric substrate (1) are positioned at the periphery of the through groove, first radiation patches (4) are laid on the periphery of the through groove, the first radiation patches (4) are in contact with the flexible cable (3), the flexible cable (3) is positioned at the end of the through groove to surround, and the flexible cable (3) is fixed on the dielectric substrate (1); the first radiation patch (4) is connected with the bending line radiation patch; the other end of the bending-line radiation patch is connected with one end of a second radiation patch (6);
preferably, the length L1 of the flexible cable (3) extending into the through groove is at least 4% of the length L of the dielectric substrate (1).
The U-shaped radiation patch comprises a plurality of U-shaped radiation patch units, a first connecting radiation patch and a second connecting radiation patch, wherein one arm of each two adjacent U-shaped radiation patch units is connected through the first connecting radiation patch, one end of each connected U-shaped radiation patch unit is connected with one end of the second connecting radiation patch, and the other end of each connected U-shaped radiation patch unit is connected with one end of the second connecting radiation patch (6); the other end of the second connecting radiation patch is connected with the first radiation patch (4);
preferably, the number or the size of the U-shaped radiating patch units can adjust the resonant frequency of the antenna, so that the antenna can work in different frequency bands;
the other end of the second radiation patch (6) is connected with one end of a third radiation patch (7); a fourth radiation patch (8) and a fifth radiation patch (9) which are symmetrically arranged are respectively arranged on two sides of the third radiation patch;
a certain rectangular gap is reserved between the fourth radiation patch (8) and the third radiation patch (7) and between the fourth radiation patch and the second radiation patch (6) for coupling; the input impedance and the impedance bandwidth of the antenna can be adjusted by changing the size of the gap;
a certain rectangular gap is reserved between the fifth radiation patch (9) and the third radiation patch (7) and between the fifth radiation patch and the second radiation patch (6) for coupling; the input impedance and the impedance bandwidth of the antenna can be adjusted by changing the size of the gap;
the second radiation patch (6), the fourth radiation patch (8) and the fifth radiation patch (9) are separated from each other by a gap with a certain wavelength to form capacitive coupling;
the ends, far away from the second radiation patch (6), of the fourth radiation patch (8) and the fifth radiation patch (9) are used as grounding ends and are connected with the outer cores of the feeder lines; the other end of the third radiation patch (7) is used as a feed end and is connected with an inner core of a feed line; and realizing the transmission of signals.
Preferably, the fourth radiation patch (8) and the fifth radiation patch (9) are located on the same horizontal layer, but may be located on the same horizontal layer as other radiation patches or may be located on different horizontal layers.
The utility model has the advantages that: 1. the antenna is manufactured by adopting the PCB with the planar structure, so that the low-profile characteristic of the antenna is realized. 2. The radiating patches with the symmetrical structures form rectangular gaps, so that the current flow direction can be changed, the effective path of the current is prolonged, the impedance bandwidth of the antenna is widened, the impedance matching performance is good, and the radiation efficiency is high. 3. The bottom of the medium substrate is designed by adopting a flexible cable, so that the size and the weight of the whole structure are effectively reduced while the antenna performance is ensured. 4. The antenna has higher gain on the premise of ensuring small size and light weight, and the value of the antenna is greater than 5dBi, so that the flying distance of the unmanned aerial vehicle is farther. 5. The utility model discloses a small, light in weight is about 15g, and is with low costs, the batch manufacturing of being convenient for. 6. The utility model discloses a design can carry out linear amplification or reduce in size, is applicable to each frequency channel and gain such as VHF, UHF, 700&800MHz, Wifi and 5G.
Drawings
FIG. 1(a) is a schematic diagram of an antenna structure; FIG. 1(b) is a schematic diagram of a dielectric substrate structure; fig. 1(c) is a schematic diagram of an antenna radiation patch structure;
FIG. 2 shows the results of the antenna gain test corresponding to FIG. 1;
FIG. 3 shows the results of a test corresponding to the radiation pattern of the antenna shown in FIG. 1;
the antenna comprises a dielectric substrate 1, a through groove 2, a flexible cable 3, a first radiation patch 4, a bending line radiation patch 5, a U-shaped radiation patch unit 5-1, a first connection radiation patch 5-2, a second connection radiation patch 5-3, a second radiation patch 6, a third radiation patch 7, a fourth radiation patch 8 and a fifth radiation patch 9.
Detailed Description
In order to more clearly illustrate the problems, technical solutions and advantages of the present invention, the following description is provided in conjunction with the drawings to illustrate the embodiments of the present invention, and the preferred embodiments described herein are only used for illustration and explanation of the present invention, and are not intended to limit the present invention.
As shown in fig. 1(a) - (c), a miniaturized high-gain flexible antenna is applied to an unmanned aerial vehicle antenna, wherein a medium substrate 1 of the antenna is made of a common rocky-gess plate, the top of the medium substrate is of a coplanar waveguide structure, a plurality of radiation patches in different shapes are printed on the medium substrate, and a flexible cable with a certain wavelength is loaded in a groove at the bottom of the medium substrate.
One end of the medium substrate 1 is provided with a through groove with one open end, and the through groove is used for placing one end of the flexible cable 3; the upper surface and the lower surface of the dielectric substrate 1 are positioned at the periphery of the through groove, and first radiation patches 4 are laid on the periphery of the through groove, the first radiation patches 4 are in contact with the flexible cable 3, and the flexible cable 3 is positioned at the grooved end to be surrounded, so that the flexible cable 3 is fixed on the dielectric substrate 1; the first radiating patch 4 is connected with the bent line radiating patch; the other end of the bending-line radiation patch is connected with one end of the second radiation patch 6;
preferably, the length L1 of the flexible cable 3 extending into the through slot is at least 4% of the length L of the dielectric substrate 1.
The U-shaped radiation patch comprises a plurality of U-shaped radiation patch units, a first connecting radiation patch and a second connecting radiation patch, wherein one arm of each two adjacent U-shaped radiation patch units is connected through the first connecting radiation patch, one end of each connected U-shaped radiation patch unit is connected with one end of the second connecting radiation patch, and the other end of each connected U-shaped radiation patch unit is connected with one end of the second connecting radiation patch (6); the other end of the second connecting radiation patch is connected with the first radiation patch (4);
preferably, the number or the size of the U-shaped radiating patch units can adjust the resonant frequency of the antenna, so that the antenna can work in different frequency bands;
the other end of the second radiation patch 6 is connected with one end of a third radiation patch 7; a fourth radiation patch 8 and a fifth radiation patch 9 which are symmetrically structured are respectively arranged on two sides of the third radiation patch;
a certain rectangular gap is reserved between the fourth radiation patch 8 and the third radiation patch 7 as well as between the fourth radiation patch 6 and the second radiation patch 6 for coupling; the input impedance and the impedance bandwidth of the antenna can be adjusted by changing the size of the gap;
a certain rectangular gap is reserved between the fifth radiation patch 9 and the third radiation patch 7 as well as between the fifth radiation patch 6 and the second radiation patch 7 for coupling; the input impedance and the impedance bandwidth of the antenna can be adjusted by changing the size of the gap;
the second radiation patch 6, the fourth radiation patch 8 and the fifth radiation patch 9 are separated from each other by a gap with a certain wavelength to form capacitive coupling;
the ends of the fourth radiation patch 8 and the fifth radiation patch 9 far away from the second radiation patch 6 are used as grounding ends and are connected with the outer cores of the feeder lines; the other end of the third radiation patch 7 is used as a feed end and is connected with an inner core of a feed line; and realizing the transmission of signals.
Flexible cable 3 buckle when unmanned aerial vehicle falls to the ground, the reconversion at once when taking off, effectual overall structure's size and weight of having reduced when guaranteeing the antenna performance.
The fourth radiation patch 8 and the fifth radiation patch 9 are located at the same level, but may be located at the same level as the other radiation patches or may be located at different levels.
The working principle is as follows:
the antenna mainly comprises a flexible cable 3, a first radiation patch 4, a U-shaped radiation patch, a second radiation patch 6 and a third radiation patch 7. The first radiating patch 4, the second radiating patch 6, the third radiating patch 7 and the flexible cable 3 radiate energy, the whole length of the radiating patches is related to the resonant frequency and the antenna gain, and the U-shaped radiating patches do not radiate energy and mainly function in enabling the currents of the second radiating patch 6 and the flexible cable 3 to be in the same phase, so that the effective path of the currents is prolonged, and the antenna gain is improved. The radiation patch 7, the radiation patch 8, and the radiation patch 9 constitute a coplanar waveguide structure in which energy is input from the radiation patch 7, and the radiation patch 8 and the radiation patch 9 serve as grounds to complete feeding.
As shown in fig. 2, the typical gain of the present embodiment can be about 5 dBi. The utility model discloses higher gain has.
As shown in fig. 3, a typical radiation pattern test result of an antenna operating frequency band includes an E plane (dotted line) and an H plane (solid line), and it can be seen that the antenna has a good omnidirectional characteristic and can meet the communication requirement of the unmanned aerial vehicle.
The above-mentioned embodiment is not to the utility model discloses a restriction, the utility model discloses not only be limited to above-mentioned embodiment, as long as accord with the utility model discloses the requirement all belongs to the protection scope of the utility model.
Claims (7)
1. A miniaturized high-gain flexible antenna is characterized by comprising a dielectric substrate (1), a flexible cable (3) and a plurality of radiation patches printed on one surface of the dielectric substrate (1) and in different shapes;
one end of the medium substrate (1) is provided with a through groove with one open end, and the through groove is used for placing one end of the flexible cable (3); the upper surface and the lower surface of the dielectric substrate (1) are positioned at the periphery of the through groove, and a first radiation patch (4) is laid; the first radiation patch (4) is connected with one end of the bending line radiation patch; the other end of the bent line radiation patch is connected with one end of a second radiation patch (6);
the other end of the second radiation patch (6) is connected with one end of a third radiation patch (7); a fourth radiation patch (8) and a fifth radiation patch (9) which are symmetrically arranged are respectively arranged on two sides of the third radiation patch;
certain gaps are reserved among the fourth radiation patch (8), the third radiation patch (7) and the second radiation patch (6) for coupling;
certain gaps are reserved among the fifth radiation patch (9), the third radiation patch (7) and the second radiation patch (6) for coupling;
the ends, far away from the second radiation patch (6), of the fourth radiation patch (8) and the fifth radiation patch (9) are used as grounding ends, and the other end of the third radiation patch (7) is used as a feeding end, so that signal transmission is realized.
2. A miniaturized high-gain flexible antenna as claimed in claim 1, wherein said meander-line radiation patch is composed of several U-shaped radiation patch elements, a first connecting radiation patch, and a second connecting radiation patch, wherein one arm of two adjacent U-shaped radiation patch elements is connected via the first connecting radiation patch, one end of the connected U-shaped radiation patch elements is connected to one end of the second connecting radiation patch, and the other end is connected to one end of the second radiation patch (6); the other end of the second connecting radiating patch is connected with the first radiating patch (4).
3. A miniaturized, high-gain, flexible antenna, as claimed in claim 2, wherein the number or size of "u" -shaped radiating elements is used to adjust the resonant frequency of the antenna, so that the antenna operates in different frequency bands.
4. A miniaturized high-gain flexible antenna according to claim 1, characterized in that the length L1 of the flexible cable (3) extending into the through slot is at least 4% of the length L of the dielectric substrate (1).
5. A miniaturized high-gain flexible antenna as claimed in claim 1, wherein said flexible cable (3) is bent when the drone lands on the ground and is restored to its original shape immediately when taking off, which effectively reduces the size and weight of the overall structure while ensuring the performance of the antenna.
6. A miniaturized high gain flexible antenna according to claim 1, characterized in that said fourth radiating patch (8) and said fifth radiating patch (9) are located at the same level, but at the same level or at different levels as the other radiating patches.
7. A miniaturized high-gain flexible antenna according to claim 1, characterized in that the ends of the fourth radiating patch (8) and the fifth radiating patch (9) remote from the second radiating patch (6) are used as ground terminals to be connected to the outer core of the feed line; the other end of the third radiation patch (7) is used as a feed end and is connected with an inner core of a feed line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022132514.6U CN213366791U (en) | 2020-09-25 | 2020-09-25 | Miniaturized high-gain flexible antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022132514.6U CN213366791U (en) | 2020-09-25 | 2020-09-25 | Miniaturized high-gain flexible antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213366791U true CN213366791U (en) | 2021-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022132514.6U Active CN213366791U (en) | 2020-09-25 | 2020-09-25 | Miniaturized high-gain flexible antenna |
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| CN (1) | CN213366791U (en) |
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- 2020-09-25 CN CN202022132514.6U patent/CN213366791U/en active Active
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