An external tri-band antenna for drones

Abstract

The present invention belongs to the field of communication technology, and specifically discloses an external tri-band antenna for unmanned aerial vehicles, including a substrate, a dipole circuit and a feeder, wherein the dipole circuit is laid on the substrate, and the dipole circuit includes a high-frequency dipole circuit, an intermediate-frequency dipole circuit and a low-frequency dipole circuit; a common microstrip line is arranged between the intermediate-frequency dipole circuit and the low-frequency dipole circuit; the feeder includes a first feeder and a second feeder, the first feeder is connected to the high-frequency dipole circuit; the second feeder is connected to the common microstrip line, and a capacitor is arranged at the connection between the second feeder and the common microstrip line. The external tri-band antenna for unmanned aerial vehicles designed with this structure has compact circuit layout and good gain effect, and can effectively meet the use requirements of high, medium and low frequency bands.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to an external tri-band antenna for an unmanned aerial vehicle. Background Art

[0002] In UAV communication applications, the communication payload usually requires the mobile communication terminal antenna to have multi-band, high gain, large bandwidth and other performance characteristics to meet the communication requirements. Moreover, as the mobile terminal develops towards miniaturization, higher requirements are placed on the antenna size.

[0003] The existing external tri-band antenna for drones has a complex layout of the oscillator circuits because the low and mid-band frequencies of the three frequency bands (978MHz, 1.09GHz, and 5.8GHz) are close, which makes it difficult to design a more compact antenna structure. Summary of the invention

[0004] The purpose of the present invention is to provide an external tri-band antenna for a UAV, which has a compact circuit layout, good gain effect, and can effectively meet the use requirements of high, medium and low frequency bands.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An external tri-band antenna for a drone, comprising:

[0007] substrate;

[0008] A vibrator circuit is laid on the substrate, and the vibrator circuit includes a high-frequency vibrator circuit, an intermediate-frequency vibrator circuit and a low-frequency vibrator circuit; a common microstrip line is arranged between the intermediate-frequency vibrator circuit and the low-frequency vibrator circuit;

[0009] The feed line includes a first feed line and a second feed line, wherein the first feed line is connected to the high-frequency oscillator circuit; the second feed line is connected to the common microstrip line, and a capacitor is provided at the connection between the second feed line and the common microstrip line.

[0010] The high-frequency oscillator circuit includes a first high-frequency oscillator circuit and a second high-frequency oscillator circuit; the first high-frequency oscillator circuit and the second high-frequency oscillator circuit are symmetrically arranged on the front and back surfaces of the substrate.

[0011] Wherein, the first high-frequency dipole line and the second high-frequency dipole line are both provided with two high-frequency dipole line units, and the two high-frequency dipole line units both include a U-shaped microstrip line and extended microstrip lines extending from both ends of the U-shaped microstrip line.

[0012] Wherein, a notch is formed in the substrate on one side of the extended microstrip line.

[0013] The common microstrip line includes a first microstrip line and a second microstrip line arranged on the back side of the substrate along the length direction of the substrate, and a third microstrip line arranged on the front side of the substrate along the width direction of the substrate, and the third microstrip line is connected to the second feeder line.

[0014] Wherein, the fourth microstrip line, the fifth microstrip line, the sixth microstrip line and the seventh microstrip line are respectively extended to both sides along the length direction of the substrate.

[0015] Among them, the fourth microstrip line, the fifth microstrip line and the common microstrip line form the intermediate frequency oscillator circuit; the sixth microstrip line, the seventh microstrip line and the common microstrip line form the low frequency oscillator circuit.

[0016] Wherein, an eighth microstrip line and a ninth microstrip line are respectively arranged on the front and back surfaces of the substrate along the length direction, and the eighth microstrip line and the ninth microstrip line are respectively connected to the high-frequency oscillator line unit.

[0017] Wherein, the substrate is provided with a tenth microstrip line connected to the third microstrip line along the length direction.

[0018] The eleventh microstrip line and the twelfth microstrip line are respectively arranged in the middle of the front and back surfaces of the substrate along the width direction of the substrate, the eleventh microstrip line is connected to the ninth microstrip line, and the twelfth microstrip line is connected to the tenth microstrip line.

[0019] The beneficial effects of the present invention are as follows: the present invention discloses an external tri-band antenna for unmanned aerial vehicles, comprising a substrate, a dipole circuit and a feeder, wherein the dipole circuit is laid on the substrate, and the dipole circuit comprises a high-frequency dipole circuit, an intermediate-frequency dipole circuit and a low-frequency dipole circuit; a common microstrip line is arranged between the intermediate-frequency dipole circuit and the low-frequency dipole circuit; the feeder comprises a first feeder and a second feeder, the first feeder is connected to the high-frequency dipole circuit; the second feeder is connected to the common microstrip line, and a capacitor is arranged at the connection between the second feeder and the common microstrip line. The external tri-band antenna for unmanned aerial vehicles designed with this structure has compact circuit layout and good gain effect, and can effectively meet the use requirements of high, medium and low frequency bands. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front plan view of an external tri-band antenna for a drone provided in this embodiment.

[0021] Figure 2 It is a reverse plan view of an external tri-band antenna for a drone provided in this embodiment.

[0022] Figure 3 yes Figure 1 Front plan view after removing the second feeder.

[0023] Figure 4 yes Figure 2 Reverse plan view after removing the first feed line.

[0024] Figure 5 yes Figure 1 A partial enlarged view of point A in the middle.

[0025] Figure 6 It is the scattering parameter diagram of the antenna in the low frequency band.

[0026] Figure 7 It is the scattering parameter diagram of the antenna in the high frequency band.

[0027] Figure 8 It is the antenna radiation pattern of the antenna in the low frequency band.

[0028] Fig. 9 It is the antenna radiation pattern of the antenna in the mid-frequency band.

[0029] Fig.10 It is the antenna radiation pattern of the antenna in the high frequency band.

[0030] In the figure:

[0031] 1. Substrate; 11. Notch; 12. Avoidance groove; 21. First high-frequency oscillator line; 211. U-shaped microstrip line; 212. Extended microstrip line; 22. Second high-frequency oscillator line; 3. Intermediate-frequency oscillator line; 31. Fourth microstrip line; 32. Fifth microstrip line; 4. Low-frequency oscillator line; 41. Sixth microstrip line; 42. Seventh microstrip line; 5. First feeder line; 6. Second feeder line; 71. First microstrip line; 72. Second microstrip line; 73. Third microstrip line; 81. Eighth microstrip line; 82. Ninth microstrip line; 83. Tenth microstrip line; 84. Eleventh microstrip line; 85. Twelfth microstrip line; 9. Capacitor. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] Combination Figures 1 to 10 As shown, the present invention provides an external tri-band antenna for a drone, including a substrate 1, a dipole line and a feeder line. Preferably, the dipole line is laid on the front and back sides of the substrate 1 in the form of multiple microstrip lines. Specifically, the dipole line includes a high-frequency dipole line, an intermediate-frequency dipole line 3 and a low-frequency dipole line 4; preferably, a common microstrip line is arranged between the intermediate-frequency dipole line 3 and the low-frequency dipole line 4; in addition, the feeder line includes a first feeder line 5 and a second feeder line 6, the first feeder line 5 is connected to the high-frequency dipole line; the second feeder line 6 is connected to the common microstrip line, and a capacitor 9 is arranged at the connection between the second feeder line 6 and the common microstrip line. By designing the external tri-band antenna for a drone in this way, the end loading technology of the capacitor 9 can be adopted, so that the external tri-band antenna for a drone can obtain good performance, thereby greatly reducing the influence of the feeder line on the directional pattern, and realizing that two feed points can simultaneously meet the requirements of the three frequency bands of 978MHz, 1.09GHz and 5.8GHz.

[0037] To be more specific, the high-frequency oscillator circuit in this embodiment includes a first high-frequency oscillator circuit 21 and a second high-frequency oscillator circuit 22 arranged at one end of the substrate 1; the first high-frequency oscillator circuit 21 and the second high-frequency oscillator circuit 22 are symmetrically arranged on the front and back sides of the substrate 1; preferably, the first high-frequency oscillator circuit 21 and the second high-frequency oscillator circuit 22 have the same circuit structure, both are provided with two high-frequency oscillator circuit units, and the opening directions of the two high-frequency oscillator circuit units on the same side are arranged in opposite directions.

[0038] Further preferably, the two high-frequency oscillator line units each include a U-shaped microstrip line 211 and an extended microstrip line 212 extending from both ends of the U-shaped microstrip line 211. In this embodiment, in order to adjust the antenna standing splash signal, preferably, a notch 11 is provided on the substrate 1 on one side of each extended microstrip line 212.

[0039] To be more specific, the shared microstrip line in this embodiment includes a first microstrip line 71 and a second microstrip line 72 arranged on the back side of the substrate 1 along the length direction of the substrate 1, and a third microstrip line 73 arranged on the front side of the substrate 1 along the width direction of the substrate 1. The first microstrip line 71, the second microstrip line 72 and the third microstrip line 73 designed in this way form a shared microstrip line for the intermediate frequency oscillator line 3 and the low frequency oscillator line 4.

[0040] In this embodiment, since the medium and low resonance frequencies are relatively close, the setting of the above-mentioned shared microstrip line can not only make the medium-frequency oscillator line 3 and the low-frequency oscillator line 4 coupled with each other, but also effectively save space and utilize the other party's oscillator arm to increase its own resonance strength.

[0041] Further, as a preference, the third microstrip line 73 in this embodiment has a fourth microstrip line 31, a fifth microstrip line 32, a sixth microstrip line 41 and a seventh microstrip line 42 extending to both sides along the length direction of the substrate 1. The fourth microstrip line 31, the fifth microstrip line 32 and the common microstrip line form an intermediate frequency oscillator line 3; the sixth microstrip line 41, the seventh microstrip line 42 and the common microstrip line form a low frequency oscillator line 4.

[0042] Preferably, the intermediate frequency sub-circuit 3 and the low frequency sub-circuit 4 located on the front side of the substrate 1 are respectively arranged in a U shape, and the opening directions of the intermediate frequency sub-circuit 3 and the low frequency sub-circuit 4 are arranged in opposite directions. In addition, in order to adjust the antenna standing splash signal, avoidance grooves 12 are opened on the substrate 1 at the end positions of the above-mentioned fourth microstrip line 31, the fifth microstrip line 32, the sixth microstrip line 41 and the seventh microstrip line 42, so that the ends of the fourth microstrip line 31, the fifth microstrip line 32, the sixth microstrip line 41 and the seventh microstrip line 42 are exposed, thereby adjusting the antenna standing splash signal.

[0043] Furthermore, preferably, the first feeder line 5 in this embodiment is disposed on the reverse side of the substrate 1. Specifically, the first feeder line 5 disposed on the reverse side of the substrate 1 is connected to the high-frequency oscillator line unit along the length direction of the middle part of the substrate 1. Preferably, the inner and outer conductors in the first feeder line 5 in this embodiment are electrically connected to the two high-frequency oscillator line units on the reverse side of the substrate 1, respectively.

[0044] Furthermore, the second feeder line 6 in this embodiment is arranged on the front side of the substrate 1. Specifically, the second feeder line 6 arranged on the front side of the substrate 1 is connected to the common microstrip line along the length direction of the middle part of the substrate 1. Further specifically, the inner conductor in the second feeder line 6 in this embodiment is electrically connected to the common microstrip line through two capacitors 9, respectively, to form a feeding point structure; in addition, the outer conductor is connected to the tenth microstrip line 83 arranged below the second feeder line 6, and the tenth microstrip line 83 is connected to the common microstrip line.

[0045] The tenth microstrip line 83 in the present embodiment functions as a ground line, and can reduce mutual interference between the first feeder line 5 and the second feeder line 6 during transmission.

[0046] Further preferably, in this embodiment, an eighth microstrip line 81 and a ninth microstrip line 82 are respectively arranged on the front and back surfaces of the substrate 1 along the length direction. The eighth microstrip line 81 and the ninth microstrip line 82 are respectively connected to the high-frequency oscillator line unit adjacent to the intermediate-frequency oscillator line 3, and like the above-mentioned tenth microstrip line 83, they also play the role of a ground line, thereby reducing the mutual interference between the first feeder line 5 and the second feeder line 6 during transmission.

[0047] Furthermore, in the present embodiment, an eleventh microstrip line 84 and a twelfth microstrip line 85 are respectively arranged in the middle of the front and back surfaces of the substrate 1 along the width direction of the substrate 1. The eleventh microstrip line 84 is connected to the ninth microstrip line 82, and the twelfth microstrip line 85 is connected to the tenth microstrip line 83. By setting the eleventh microstrip line 84 and the twelfth microstrip line 85, the purpose of adjusting the length of the antenna standing wave signal is achieved.

[0048] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An external tri-band antenna for a drone, characterized in that: include: base(1); An oscillator circuit is laid on the substrate (1), the oscillator circuit comprising a high-frequency oscillator circuit, an intermediate-frequency oscillator circuit (3) and a low-frequency oscillator circuit (4); a shared microstrip line is provided between the intermediate-frequency oscillator circuit (3) and the low-frequency oscillator circuit (4); A feeder line, comprising a first feeder line (5) and a second feeder line (6), wherein the first feeder line (5) is connected to the high-frequency oscillator line; the second feeder line (6) is connected to the common microstrip line, and a capacitor (9) is provided at the connection between the second feeder line (6) and the common microstrip line; The shared microstrip line comprises a first microstrip line (71) and a second microstrip line (72) arranged on the back side of the substrate (1) along the length direction of the substrate (1), and a third microstrip line (73) arranged on the front side of the substrate (1) along the width direction of the substrate (1), and the third microstrip line (73) is connected to the second feeder line (6); A fourth microstrip line (31), a fifth microstrip line (32), a sixth microstrip line (41) and a seventh microstrip line (42) are respectively extended to both sides of the third microstrip line (73) along the length direction of the substrate (1).

2. The external tri-band antenna for a drone according to claim 1, characterized in that: The high-frequency oscillator circuit comprises a first high-frequency oscillator circuit (21) and a second high-frequency oscillator circuit (22); the first high-frequency oscillator circuit (21) and the second high-frequency oscillator circuit (22) are symmetrically arranged on the front and back surfaces of the substrate (1).

3. The external tri-band antenna for a drone according to claim 2, characterized in that: The first high-frequency oscillator line (21) and the second high-frequency oscillator line (22) have the same structure. The first high-frequency oscillator line (21) and the second high-frequency oscillator line (22) are both provided with two high-frequency oscillator line units, and the two high-frequency oscillator line units both include a U-shaped microstrip line (211) and extended microstrip lines (212) extending from both ends of the U-shaped microstrip line (211).

4. The external tri-band antenna for a drone according to claim 3, characterized in that: The substrate (1) on one side of the extended microstrip line (212) is provided with a notch (11).

5. The external tri-band antenna for a drone according to claim 1, characterized in that: The fourth microstrip line (31), the fifth microstrip line (32) and the common microstrip line form the intermediate frequency oscillator line (3); the sixth microstrip line (41), the seventh microstrip line (42) and the common microstrip line form the low frequency oscillator line (4).

6. The external tri-band antenna for a drone according to claim 1, characterized in that: An eighth microstrip line (81) and a ninth microstrip line (82) are respectively arranged on the front and back surfaces of the substrate (1) along the length direction, and the eighth microstrip line (81) and the ninth microstrip line (82) are respectively connected to the high-frequency oscillator line unit.

7. The external tri-band antenna for a UAV according to claim 6, characterized in that: The substrate (1) is provided with a tenth microstrip line (83) connected to the third microstrip line (73) along the length direction.

8. The external tri-band antenna for a UAV according to claim 7, characterized in that: An eleventh microstrip line (84) and a twelfth microstrip line (85) are respectively arranged in the middle of the front and back surfaces of the substrate (1) along the width direction of the substrate (1); the eleventh microstrip line (84) is connected to the ninth microstrip line (82), and the twelfth microstrip line (85) is connected to the tenth microstrip line (83).

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