Miniaturized dipole antenna and electric service inspection vehicle

Abstract

The invention discloses a miniaturized dipole antenna and an electric service inspection van, belongs to the technical field of wireless communication, and aims to solve the problem that a monopole antenna in an existing electric service inspection van is low in nominal gain, the miniaturized dipole antenna comprises a radiator (2), the radiator (2) comprises four horizontal arms (21) and four vertical arms (22), the four horizontal arms (21) are located in the same horizontal plane, the four horizontal arms (21) are each of a strip-shaped bent structure, the four horizontal arms (21) and the four vertical arms (22) are connected in a one-to-one correspondence mode, and the four vertical arms (22) extend in the vertical direction. The miniaturized dipole antenna has the characteristics of high efficiency and miniaturization, and has important practical significance for improving the performance of wireless transmission of detection data of an electric service detection vehicle.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, specifically to a miniaturized dipole antenna and a signal inspection vehicle. Background Art

[0002] An antenna is a core component for receiving and transmitting data in the wireless data transmission device of a railway signal inspection vehicle. Its performance directly determines the reliability of the device and plays a crucial role in the wireless transmission of inspection data. The existing wireless data transmission system of a signal inspection vehicle uses a monopole antenna with a relatively low nominal gain. At the same time, the wireless data transmission system of a signal inspection vehicle faces the problem of space limitation. Since the antenna is usually one of the components with the largest volume in a wireless system, the need for its miniaturization is particularly urgent.

[0003] In addition, existing research usually assumes that there is a sufficiently large metal floor at the bottom of the antenna. However, in the carriage of a railway signal inspection vehicle, the antenna may be installed on the metal side wall of the cabinet, resulting in a situation where there is no metal floor at the bottom but there is a metal floor on the side. In this environment, the lack of a metal floor at the bottom will significantly reduce the aperture efficiency of the antenna, and at the same time, the metal side wall will also have a greater impact on the impedance characteristics of the antenna. Summary of the Invention

[0004] To solve the problem of the relatively low nominal gain of the monopole antenna in the existing signal inspection vehicle, the present invention provides a miniaturized dipole antenna and a signal inspection vehicle. The miniaturized dipole antenna has the characteristics of high efficiency and miniaturization, which has important practical significance for improving the performance of wireless data transmission in signal inspection vehicles.

[0005] The technical solution adopted by the embodiments of the present invention to solve their technical problems is as follows:

[0006] A miniaturized dipole antenna includes a radiator, which contains four horizontal arms and four vertical arms. The four horizontal arms are all located in the same horizontal plane. The four horizontal arms are all bar-shaped bent structures. The four horizontal arms and the four vertical arms are connected in one-to-one correspondence, and the four vertical arms all extend in the vertical direction.

[0007] A signal inspection vehicle includes a cabinet and the above-mentioned miniaturized dipole antenna. The third vertical radiation arm and the fourth vertical radiation arm are adjacent to the metal side wall of the cabinet.

[0008] The beneficial effects of the embodiments of the present invention are as follows:

[0009] 1. The present invention adopts a two-horizontal connection line structure, which realizes miniaturization while increasing the radiation current area in the horizontal plane, suppressing the radiation current intensity of the two side vertical arms, and improving the efficiency of the antenna.

[0010] 2. The vertical arms with different lengths on both sides designed in the present invention can achieve impedance matching in the case of a single-sided metal wall.

[0011] 3. The miniaturized dipole antenna designed in the present invention adopts a radome, which has the advantages of good stability and high mechanical strength. At the same time, it is small in size, simple in structure and easy to process.

[0012] 4. The miniaturized dipole antenna designed in the present invention takes into account the antenna efficiency and impedance matching in the case of only a side metal wall, and has advantages in the application scenario of the signal inspection vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0014] Figure 1 is a three-dimensional schematic diagram of the miniaturized dipole antenna described in the present invention.

[0015] Figure 2 is a right-view schematic diagram of the miniaturized dipole antenna described in the present invention.

[0016] Figure 3 is a bottom-view schematic diagram of the miniaturized dipole antenna described in the present invention.

[0017] Figure 4 is a cross-sectional schematic diagram of the miniaturized dipole antenna described in the present invention.

[0018] Figure 5 is a top-view schematic diagram of the radiator.

[0019] Figure 6 is an exploded schematic diagram of the miniaturized dipole antenna described in the present invention.

[0020] The description of the reference numerals in the drawings is as follows:

[0021] 1. Dielectric radome; 2. Radiator; 3. Feeding microstrip; 4. Dielectric nylon column; 5. Metal base; 6. Probe connector; 7. Dielectric substrate;

[0022] 11. Top wall; 12. Side peripheral wall; 13. Internal cavity;

[0023] 21. Horizontal arm; 22. Vertical arm; 23. Horizontal connection line;

[0024] 51. Metal bottom plate; 52. Metal side plate; 53. Metal back cavity; 54. Connector socket;

[0025] 211. First horizontal radiation arm; 212. Second horizontal radiation arm; 213. Third horizontal radiation arm; 214. Fourth horizontal radiation arm; 215. Short - circuit section;

[0026] 221. First vertical radiation arm; 222. Second vertical radiation arm; 223. Third vertical radiation arm; 224. Fourth vertical radiation arm; 225. Horizontal section; 226. Vertical section;

[0027] 231. First horizontal connecting radiation line; 232. Second horizontal connecting radiation line;

[0028] 2111. First horizontal section one; 2112. First horizontal section two; 2113. First horizontal section three; 2114. First horizontal section four; 2115. First horizontal section five; 2116. First horizontal section six; 2117. First horizontal section seven; 2118. First horizontal section eight; 2119. First horizontal section nine; 21110. First horizontal section ten; 21111. First horizontal section eleven; 21112. First horizontal section twelve; 21113. First horizontal section thirteen. Detailed implementation mode

[0029] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] For the convenience of understanding and description, an absolute position relationship is adopted in the following description of the present invention. Without special instructions, the orientation word "up" means the direction perpendicular to the Figure 5 paper surface in and pointing outside the paper surface, the orientation word "down" means the direction perpendicular to the Figure 5 paper surface in and pointing inside the paper surface, "left" means the Figure 5 left - hand direction in, the orientation word "right" means the Figure 5 right - hand direction in, "front" means the Figure 5 upper - side direction in, the orientation word "back" means the Figure 5 lower - side direction in. The present invention is described from the observation perspective of the reader or user, but the above orientation words should not be understood or interpreted as limiting the protection scope of the present invention. Regarding the dimensions and angles of the components therein, those skilled in the art can specifically determine them according to actual needs or through a limited number of tests.

[0031] As Figures 1 to 6 shown, a miniaturized dipole antenna described in an embodiment of the present invention includes a radiator 2. The radiator 2 includes four horizontal arms 21 and four vertical arms 22. The four horizontal arms 21 are all located in the same horizontal plane. The four horizontal arms 21 are all strip - shaped bent structures. The four horizontal arms 21 and the four vertical arms 22 are connected in one - to - one correspondence. The four vertical arms 22 all extend along the vertical direction.

[0032] Along the circumference of the radiator 2, the four horizontal arms 21 are successively the first horizontal radiation arm 211, the second horizontal radiation arm 212, the third horizontal radiation arm 213, and the fourth horizontal radiation arm 214, and the four vertical arms 22 are successively the first vertical radiation arm 221, the second vertical radiation arm 222, the third vertical radiation arm 223, and the fourth vertical radiation arm 224. The first vertical radiation arm 221 is correspondingly connected to the first horizontal radiation arm 211, the second vertical radiation arm 222 is correspondingly connected to the second horizontal radiation arm 212, the third vertical radiation arm 223 is correspondingly connected to the third horizontal radiation arm 213, and the fourth vertical radiation arm 224 is correspondingly connected to the fourth horizontal radiation arm 214.

[0033] As Figure 5 shown, the first horizontal radiation arm 211 and the second horizontal radiation arm 212 are arranged at a left - right interval, and the first horizontal radiation arm 211 and the second horizontal radiation arm 212 are left - right symmetric. The third horizontal radiation arm 213 and the fourth horizontal radiation arm 214 are arranged at a right - left interval, and the third horizontal radiation arm 213 and the fourth horizontal radiation arm 214 are right - left symmetric.

[0034] The first horizontal radiation arm 211 is connected to the fourth horizontal radiation arm 214, the first horizontal radiation arm 211 and the fourth horizontal radiation arm 214 are arranged front - to - back, and the first horizontal radiation arm 211 and the fourth horizontal radiation arm 214 are front - to - back symmetric. The second horizontal radiation arm 212 is connected to the third horizontal radiation arm 213, the second horizontal radiation arm 212 and the third horizontal radiation arm 213 are arranged front - to - back, and the second horizontal radiation arm 212 and the third horizontal radiation arm 213 are front - to - back symmetric.

[0035] The structures of the four horizontal arms 21 are all the same. The first horizontal radiation arm 211 and the second horizontal radiation arm 212 are mirror images of each other, the third horizontal radiation arm 213 and the fourth horizontal radiation arm 214 are mirror images of each other, the first horizontal radiation arm 211 and the fourth horizontal radiation arm 214 are mirror images of each other, and the four horizontal arms 21 are symmetric about the E - plane and H - plane of the miniaturized dipole antenna. Each horizontal arm 21 adopts a bent structure. The four horizontal arms are symmetric about the E - plane and H - plane of the antenna, and the end of each horizontal arm is connected to a vertical arm to further achieve miniaturization.

[0036] As Figure 5As shown, along the direction from one end of the first horizontal radiation arm 211 to the other end of the first horizontal radiation arm 211, the first horizontal radiation arm 211 includes a first horizontal section 2111, a first horizontal section 2112, a first horizontal section 2113, a first horizontal section 2114, a first horizontal section 2115, a first horizontal section 2116, a first horizontal section 2117, a first horizontal section 2118, a first horizontal section 2119, a first horizontal section 21110, a first horizontal section 21111, a first horizontal section 21112, and a first horizontal section 21113 that are connected in sequence.

[0037] The structures of the four horizontal arms 21 are the same, that is, along the direction from one end of the horizontal arm 21 to the other end of the horizontal arm 21, the four horizontal arms 21 all include a first horizontal section 2111, a first horizontal section 2112, a first horizontal section 2113, a first horizontal section 2114, a first horizontal section 2115, a first horizontal section 2116, a first horizontal section 2117, a first horizontal section 2118, a first horizontal section 2119, a first horizontal section 21110, a first horizontal section 21111, a first horizontal section 21112, and a first horizontal section 21113 that are connected in sequence.

[0038] The first horizontal section 2111 extends in the front - rear direction, the first horizontal section 2112 extends in the left - right direction, the first horizontal section 2113 extends in the front - rear direction, the first horizontal section 2114 extends in the left - right direction, the first horizontal section 2115 extends in the front - rear direction, the first horizontal section 2116 extends in the left - right direction, the first horizontal section 2117 extends in the front - rear direction, the first horizontal section 2118 extends in the left - right direction, the first horizontal section 2119 extends in the front - rear direction, the first horizontal section 21110 extends in the left - right direction, the first horizontal section 21111 extends in the front - rear direction, the first horizontal section 21112 extends in the left - right direction, and the first horizontal section 21113 extends in the front - rear direction.

[0039] One end of the first horizontal radiation arm 211 is connected to one end of the fourth horizontal radiation arm 214, one end of the second horizontal radiation arm 212 is connected to one end of the third horizontal radiation arm 213, the first vertical radiation arm 221 is correspondingly connected to the other end of the first horizontal radiation arm 211, the second vertical radiation arm 222 is correspondingly connected to the other end of the second horizontal radiation arm 212, the third vertical radiation arm 223 is correspondingly connected to the other end of the third horizontal radiation arm 213, and the fourth vertical radiation arm 224 is correspondingly connected to the other end of the fourth horizontal radiation arm 214.

[0040] As Figure 6As shown, the four vertical arms 22 are all in an inverted L-shaped structure. The four vertical arms 22 all contain a horizontal section 225 and a vertical section 226 connected up and down. The vertical sections 226 of the four vertical arms 22 all extend in the vertical direction. The horizontal section 225 and the horizontal arm 21 are connected in an upper and lower stacked manner. The vertical section 226 is located below the horizontal arm 21. The height of the vertical section 226 of the first vertical radiation arm 221 is equal to the height of the vertical section 226 of the second vertical radiation arm 222. The height of the vertical section 226 of the third vertical radiation arm 223 is equal to the height of the vertical section 226 of the fourth vertical radiation arm 224.

[0041] Considering the influence of the side metal wall on the dipole antenna, the vertical arm 22 of the dipole closer to the wall will be longer than the other side to offset the impedance mismatch problem caused by the asymmetry brought by the side wall. The specific implementation method is that the height of the vertical section 226 of the third vertical radiation arm 223 is greater than the height of the vertical section 226 of the first vertical radiation arm 221.

[0042] As Figures 5 to 6 shown, the radiator 2 also contains two horizontal connection lines 23. The two horizontal connection lines 23 are respectively the first horizontal connection radiation line 231 and the second horizontal connection radiation line 232. The other end of the first horizontal radiation arm 211 and the other end of the second horizontal radiation arm 212 are connected by the first horizontal connection radiation line 231. The other end of the third horizontal radiation arm 213 and the other end of the fourth horizontal radiation arm 214 are connected by the second horizontal connection radiation line 232. The four horizontal arms 21 and the two horizontal connection lines 23 are connected into an integral structure. The four horizontal arms 21 and the two horizontal connection lines 23 form a loop. The four horizontal arms 21, the four vertical arms 22 and the two horizontal connection lines 23 are all metal sheets.

[0043] To further increase the bandwidth, a short-circuit structure is set between the horizontal arm 21 and the horizontal connection line 23 on the side close to the wall to increase additional resonance points. Specifically, the first horizontal six-segment 2116 of the third horizontal radiation arm 213 or the first horizontal six-segment 2116 of the fourth horizontal radiation arm 214 is connected to the second horizontal connection radiation line 232 through a short-circuit segment 215. The short-circuit segment 215 is a metal sheet. The four horizontal arms 21, a short-circuit segment 215 and the two horizontal connection lines 23 are connected into one body.

[0044] To improve the radiation efficiency of the antenna, two horizontal connecting lines 23 are added to the dipole antenna, making the dipole antenna form a loop at this time. At the working resonant point, the opposite currents that originally appeared on the resonant straight conductor form in-phase currents through the bent loop. The area of the in-phase current increases, the effective radiation area increases, and the radiation efficiency increases. In addition, after adding the horizontal connecting lines 23, more current is concentrated on the horizontal connecting lines 23 and the horizontal arms 21, rather than on the vertical arms 22. Since the current on the vertical arms 22 will cause the beam width of the radiation pattern to become wider, thereby reducing the antenna gain, this optimization of the current distribution effectively avoids this problem and further improves the radiation performance and efficiency of the antenna.

[0045] As Figures 1 to 6 shown, the miniaturized dipole antenna further includes a feeding microstrip 3, a dielectric nylon column 4, a metal base 5, and a dielectric substrate 7. The metal base 5 is a cylindrical structure with an open upper end and a closed lower end. The metal base 5 includes a metal bottom plate 51, a metal side plate 52, and a metal back cavity 53. The metal bottom plate 51 and the metal side plate 52 enclose the metal back cavity 53. The four horizontal arms 21 and the two horizontal connecting lines 23 are stacked and connected to the upper and lower layers of the dielectric substrate 7. The dielectric substrate 7 is connected and fixed to the metal bottom plate 51 through four dielectric nylon columns 4. The dielectric substrate 7 is located outside the metal back cavity 53 and above the metal back cavity 53. The upper part of the vertical arm 22 is located outside the metal back cavity 53, and the lower part of the vertical arm 22 is located inside the metal back cavity 53.

[0046] The upper end of the feeding microstrip 3 is connected to the radiator 2, and the connection point is between the first horizontal radiation arm 211 and the third horizontal radiation arm 213, and between the second horizontal radiation arm 212 and the fourth horizontal radiation arm 214. The lower end of the feeding microstrip 3 is provided with a probe connector 6. The feeding microstrip 3 is connected and fixed to the metal back cavity 53. A connector socket 54 is provided on the metal bottom plate 51, and the connector socket 54 corresponds to the probe connector 6. The probe connector 6 is a 50-ohm probe connector 6. The upper end of the feeding microstrip 3 excites the dipole antenna through slot coupling. By controlling the thickness of the middle part of the feeding microstrip 3, impedance matching between the 50-ohm probe connector and the dipole antenna is achieved. The metal back cavity 53 is used to improve the overall efficiency of the antenna. At the same time, the capacitive coupling effect between it and the vertical dipole arm further optimizes the impedance matching of the antenna. There are four dielectric nylon columns 4, which can fix the folded radiation structure of the dipole antenna to the metal back cavity, ensuring the stability and mechanical strength of the overall antenna structure.

[0047] As Figures 1 to 6As shown, the miniaturized dipole antenna further includes a dielectric radome 1. The dielectric radome 1 is a cylindrical structure with an open lower end and a closed upper end. The dielectric radome 1 includes a top wall 11, a side peripheral wall 12, and an internal cavity 13. The top wall 11 and the side peripheral wall 12 enclose the internal cavity 13. The dielectric radome 1 is in a cube structure. The side peripheral wall 12 of the dielectric radome 1 is sleeved outside the metal side plate 52 of the metal base 5 in a matching manner. The dielectric radome 1 and the metal base 5 can be fixedly connected by screws. The lower end of the dielectric radome 1 is in an open state. The radiator 2 is located in the internal cavity 13, and the radiator 2 and the top wall 11 are arranged at intervals up and down.

[0048] The length of the miniaturized dipole antenna can be 100 mm to 300 mm, the width can be 100 mm to 300 mm, and the height can be 100 mm to 300 mm. For example, the length of the miniaturized dipole antenna can be 200 mm, the width can be 200 mm, and the height can be 145 mm. The dielectric radome 1 covers the dipole antenna to isolate moisture, dust, and other pollutants, ensuring the long-term stability of the antenna performance. The thickness of the radome is relatively thin, having a minimal impact on the electromagnetic performance of the dipole antenna.

[0049] Next, an electrical service inspection vehicle is introduced. The electrical service inspection vehicle includes a cabinet and the above-mentioned miniaturized dipole antenna. The third vertical radiation arm 223 and the fourth vertical radiation arm 224 are adjacent to the metal side wall (upright side wall) of the cabinet, that is, the rear side of the side peripheral wall 12 of the dielectric radome 1 is laminated and attached to the metal side wall. Among them, the size of the miniaturized dipole antenna can be proportionally reduced or enlarged, not limited to the microwave band used in railway communication, and the feeding method is not limited to microstrip coupling feeding.

[0050] As mentioned above, the above are only specific embodiments of the present invention and cannot be used to limit the scope of the invention implementation. Therefore, the replacement of equivalent components or equivalent changes and modifications made according to the protection scope of the present invention should still fall within the scope covered by the present invention. In addition, the technical features in the present invention can be freely combined with each other between technical features, between technical features and technical solutions, between technical solutions and technical solutions, and between embodiments and embodiments.

Claims

1. A miniaturized dipole antenna, characterized in that: The miniaturized dipole antenna comprises a radiator (2), the radiator (2) comprising four horizontal arms (21) and four vertical arms (22), the four horizontal arms (21) are all located in the same horizontal plane, the four horizontal arms (21) are all strip-shaped bent structures, the four horizontal arms (21) and the four vertical arms (22) are connected in a one-to-one correspondence, and the four vertical arms (22) extend in a vertical direction.

2. The miniaturized dipole antenna according to claim 1, characterized in that: Along the circumference of the radiator (2), the four horizontal arms (21) are respectively a first horizontal radiating arm (211), a second horizontal radiating arm (212), a third horizontal radiating arm (213) and a fourth horizontal radiating arm (214); the four vertical arms (22) are respectively a first vertical radiating arm (221), a second vertical radiating arm (222), a third vertical radiating arm (223) and a fourth vertical radiating arm (224); the first vertical radiating arm (221) is connected to the first horizontal radiating arm (211) correspondingly, the second vertical radiating arm (222) is connected to the second horizontal radiating arm (212) correspondingly, the third vertical radiating arm (223) is connected to the third horizontal radiating arm (213) correspondingly, and the fourth vertical radiating arm (224) is connected to the fourth horizontal radiating arm (214) correspondingly.

3. The miniaturized dipole antenna according to claim 2, characterized in that: The first horizontal radiation arm (211) and the second horizontal radiation arm (212) are arranged at intervals from left to right, the third horizontal radiation arm (213) and the fourth horizontal radiation arm (214) are arranged at intervals from right to left, the first horizontal radiation arm (211) and the fourth horizontal radiation arm (214) are arranged front to back, and the second horizontal radiation arm (212) and the third horizontal radiation arm (213) are arranged front to back; Along the direction from one end of the first horizontal radiation arm (211) to the other end of the first horizontal radiation arm (211), the first horizontal radiation arm (211) comprises a first horizontal segment (2111), a first horizontal segment (2112), a first horizontal segment (2113), a first horizontal segment (2114), a first horizontal segment (2115), a first horizontal segment (2116), a first horizontal segment (2117), a first horizontal segment (2118), a first horizontal segment (2119), a first horizontal segment (21110), a first horizontal segment (21111), a first horizontal segment (21112) and a first horizontal segment (21113) which are connected in sequence; the four horizontal arms (21) are all of the same structure, and the four horizontal arms (21) are symmetrical with respect to the E plane and the H plane of the miniaturized dipole antenna.

4. The miniaturized dipole antenna according to claim 3, characterized in that: The first horizontal section one (2111) extends along the front-to-back direction, the first horizontal section two (2112) extends along the left-right direction, the first horizontal section three (2113) extends along the front-to-back direction, the first horizontal section four (2114) extends along the left-right direction, the first horizontal section five (2115) extends along the front-to-back direction, the first horizontal section six (2116) extends along the left-right direction, the first horizontal section seven (2117) extends along the front-to-back direction, the first horizontal section eight (2118) extends along the left-right direction, the first horizontal section nine (2119) extends along the front-to-back direction, the first horizontal section ten (21110) extends along the left-right direction, the first horizontal section eleven (21111) extends along the front-to-back direction, the first horizontal section twelve (21112) extends along the left-right direction, and the first horizontal section thirteen (21113) extends along the front-to-back direction.

5. The miniaturized dipole antenna according to claim 4, characterized in that: One end of the first horizontal radiation arm (211) is connected to one end of the fourth horizontal radiation arm (214), one end of the second horizontal radiation arm (212) is connected to one end of the third horizontal radiation arm (213), the first vertical radiation arm (221) is correspondingly connected to the other end of the first horizontal radiation arm (211), the second vertical radiation arm (222) is correspondingly connected to the other end of the second horizontal radiation arm (212), the third vertical radiation arm (223) is correspondingly connected to the other end of the third horizontal radiation arm (213), and the fourth vertical radiation arm (224) is correspondingly connected to the other end of the fourth horizontal radiation arm (214).

6. The miniaturized dipole antenna according to claim 2, characterized in that: The four vertical arms (22) all include a horizontal section (225) and a vertical section (226) connected up and down, the horizontal section (225) and the horizontal arm (21) are stacked up and down, the height of the vertical section (226) of the first vertical radiation arm (221) is equal to the height of the vertical section (226) of the second vertical radiation arm (222), the height of the vertical section (226) of the third vertical radiation arm (223) is equal to the height of the vertical section (226) of the fourth vertical radiation arm (224), and the height of the vertical section (226) of the third vertical radiation arm (223) is greater than the height of the vertical section (226) of the first vertical radiation arm (221).

7. The miniaturized dipole antenna according to claim 5, characterized in that: The radiator (2) further comprises two horizontal connecting lines (23), the two horizontal connecting lines (23) being respectively a first horizontal connecting radiating line (231) and a second horizontal connecting radiating line (232); the other end of the first horizontal radiating arm (211) and the other end of the second horizontal radiating arm (212) are connected via the first horizontal connecting radiating line (231); the other end of the third horizontal radiating arm (213) and the other end of the fourth horizontal radiating arm (214) are connected via the second horizontal connecting radiating line (232); the four horizontal arms (21) and the two horizontal connecting lines (23) form a ring loop; the first horizontal six segments (2116) of the third horizontal radiating arm (213) or the first horizontal six segments (2116) of the fourth horizontal radiating arm (214) are connected to the second horizontal connecting radiating line (232) via a short-circuit segment (215).

8. The miniaturized dipole antenna according to claim 1, characterized in that: The miniaturized dipole antenna further comprises a feeding microstrip (3), a dielectric nylon column (4), a metal base (5) and a dielectric substrate (7); the metal base (5) comprises a metal bottom plate (51), a metal side plate (52) and a metal back cavity (53); the metal bottom plate (51) and the metal side plate (52) form a metal back cavity (53); four horizontal arms (21) and the dielectric substrate (7) are stacked and connected up and down; the dielectric substrate (7) is connected to the metal bottom plate (51) through the dielectric nylon column (4); the dielectric substrate (7) is located above the metal back cavity (53); the upper end of the feeding microstrip (3) is connected to the radiator (2); a probe connector (6) is provided at the lower end of the feeding microstrip (3); a connector socket (54) is provided on the metal bottom plate (51); the connector socket (54) corresponds to the probe connector (6).

9. The miniaturized dipole antenna according to claim 1, characterized in that: The miniaturized dipole antenna also includes a dielectric antenna cover (1), the dielectric antenna cover (1) includes a top wall (11), a side wall (12) and an internal cavity (13), the dielectric antenna cover (1) is in a cubic structure, the lower end of the dielectric antenna cover (1) is in an open state, and the radiator (2) is located in the internal cavity (13).

10. An electric service inspection vehicle, characterized in that: The electric service inspection vehicle comprises a cabinet and the miniaturized dipole antenna according to claim 6, and the third vertical radiation arm (223) and the fourth vertical radiation arm (224) are adjacent to the metal side wall of the cabinet.

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