Antenna structure and underground telemetering terminal of inspection well

Abstract

The utility model relates to the technical field of antennas, and provides an antenna structure and a telemetering terminal under an inspection well, the antenna structure comprises a base and a radiator, the base comprises a first substrate, the first substrate is provided with an insertion part, a first layer structure is formed on the first substrate, the first layer structure is used for grounding, and the insertion part extends to the first layer structure; the radiator comprises a second substrate, the second substrate is provided with a plug-in matching part, the plug-in matching part is electrically connected with the plug-in matching part, a second layer structure is formed in a partial area of the second substrate and used for being grounded, the plug-in matching part extends to the second layer structure, and a functional layer structure is formed in the rest area of the second substrate and used for being grounded. The second layer structure is close to the first layer structure, and the functional layer structure is far away from the first layer structure. Compared with the prior art, the antenna structure provided by the utility model is simpler in overall structure, relatively simple in manufacturing process, easy to produce in batches, and capable of meeting the requirement of signal transmission under an inspection well.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, and in particular provides an antenna structure and a manhole telemetry terminal with the antenna structure. Background Art

[0002] The underground manhole telemetry terminal collects relevant data such as underground water level, flow rate, water quality status, etc. through external sensors. In addition, the collected data is interacted with the surrounding communication base stations in the form of radio electromagnetic waves via the cellular network, and finally reported to the background server to realize remote telemetry monitoring of the environment.

[0003] However, due to the weak coverage signal of underground cellular base stations and the heavy metal structure of manhole covers, the propagation of wireless signals is further weakened. Usually, the flat inverted F antenna used in underground manhole telemetry terminals is mostly a metal mold structure to ensure three-dimensional strength, which has the disadvantages of complex structural processing and the need for additional molds. In addition, metal antennas are more susceptible to erosion by the humid environment underground, which in turn causes changes in the conductivity of the antenna surface and greatly weakens the antenna performance. Utility Model Content

[0004] The utility model aims to provide an antenna structure and an underground telemetry terminal, aiming to solve the problem that the existing antenna structure is complex in structure and manufacturing process and is difficult to adapt to the needs of underground signal transmission.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] In a first aspect, an embodiment of the present application provides an antenna structure, including:

[0007] A base, the base comprising a first substrate, a plug-in portion being provided on the first substrate, a first layer structure being formed on the first substrate, the first layer structure being used for grounding, and the plug-in portion extending to the first layer structure;

[0008] A radiator, the radiator comprising a second substrate, a plug-in mating portion being provided on the second substrate and being plugged and matched with the plug-in portion, the plug-in portion being electrically connected to the plug-in mating portion, a second layer structure being formed in a partial area of ​​the second substrate, the second layer structure being used for grounding, the plug-in mating portion extending to the second layer structure, the remaining area of ​​the second substrate forming a functional layer structure, the second layer structure being arranged close to the first layer structure, and the functional layer structure being arranged far away from the first layer structure.

[0009] Beneficial effects of the utility model: The antenna structure provided by the utility model is connected to the radiator by means of plug-in matching. Specifically, a plug-in portion is provided on the base, and a plug-in matching portion that plugs and matches with the plug-in portion is provided on the radiator, so that after the assembly is completed, the antenna structure as a whole presents a three-dimensional structure. At the same time, the second layer structure and the functional layer structure are respectively arranged in different areas of the second substrate of the radiator to meet the corresponding signal transmission requirements, and the second layer structure is arranged close to the first layer structure of the base, and the functional layer structure is arranged away from the first layer structure of the base. In this way, the overall structure of the antenna structure provided by the present application is simpler, the manufacturing process is relatively simple, it is easy to mass produce, and it can also meet the needs of signal transmission in manholes.

[0010] In some embodiments, the functional layer structure includes a feeding branch, a high-frequency resonant branch electrically connected to the feeding branch, a low-frequency resonant branch electrically connected to the feeding branch, an impedance adjustment branch electrically connected to the feeding branch at one end, and a feeding simulation coaxial line. The feeding branch is electrically connected to the second layer structure through the feeding simulation coaxial line, and the other end of the impedance adjustment branch is electrically connected to the second layer structure.

[0011] By adopting the above technical solution, the functional layer structure is specifically used to meet and adapt to the signal transmission needs underground in the manhole.

[0012] In some embodiments, the high-frequency resonant branch includes a first horizontal branch and a trapezoidal branch connected to each other, and the first horizontal branch is electrically connected to the feeding branch.

[0013] By adopting the above technical solution, the structural combination of the first horizontal branch and the trapezoidal branch helps to improve the radiation impedance of the antenna, thereby improving the bandwidth.

[0014] In some embodiments, the low-frequency resonant branch includes a second horizontal branch and a first vertical branch connected to each other, and the second horizontal branch is electrically connected to the feeding branch.

[0015] By adopting the above technical solution, the structural combination of the second horizontal branch and the first vertical branch can increase the effective area of ​​the low-frequency resonance branch, increase the radiation resistance near the resonance point, and ultimately improve the radiation efficiency and increase the bandwidth.

[0016] In some embodiments, the impedance adjustment branch includes a third horizontal branch and a second vertical branch connected to each other, the third horizontal branch is electrically connected to the feeding branch, and the second vertical branch is electrically connected to the second layer structure.

[0017] By adopting the above technical solution, the impedance adjustment branch is a short-circuit branch, and the size of the loop formed by the impedance adjustment branch, the feeding branch, the feeding simulated coaxial line and the second layer structure is adjusted to change the path length of the short-circuit current, that is, controlling the length of the short-circuit path is equivalent to controlling the size of the matching inductance and capacitance, thereby adjusting the resonant impedance. Specifically, the horizontal length of the third horizontal branch and the vertical length of the second vertical branch can be adjusted.

[0018] In some embodiments, the plug-in portion is a square pad hole, the plug-in mating portion is a square pad, and the square pad is vertically plugged into the square pad hole.

[0019] By adopting the above technical solution, the square pad is vertically inserted into the square pad hole to meet the requirement of vertical insertion of the radiator on the base.

[0020] In some embodiments, the number of the square pad holes is two, the base is a circular structure, and the square pad holes are arranged side by side along the length direction of the holes themselves, and are also symmetrically arranged about the center of the base.

[0021] By adopting the above technical solution, the force positions between the base and the radiator are more balanced, which can effectively improve the structural stability of the connection position between the base and the radiator.

[0022] In some embodiments, a feed line hole is provided on the base, and an external line is connected to the feeding analog coaxial line through the feed line hole.

[0023] By adopting the above technical solution, the external signal line can be connected to the feeding analog coaxial line through the feed line hole to reduce the routing path of the external signal line in the antenna structure.

[0024] In some embodiments, a through hole is provided on the base, the antenna structure further comprises a shell with a hollow structure, the base and the radiator are arranged in the shell, and the shell is connected to the base through the through hole.

[0025] By adopting the above technical solution, the shell connects the base and the radiator to the shell, and the shell protects the base and the radiator.

[0026] In a second aspect, an embodiment of the present application further provides an underground manhole telemetry terminal, comprising the antenna structure described above.

[0027] Beneficial effects of the utility model: the underground manhole telemetry terminal provided by the utility model, on the basis of having the above-mentioned antenna structure, has a longer service life and a better communication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of the antenna provided in the embodiment of the utility model;

[0030] Figure 2 An exploded view of the antenna structure provided by an embodiment of the utility model;

[0031] Figure 3 A front view of a radiator of an antenna structure provided by an embodiment of the utility model;

[0032] Figure 4 A graph showing how the reflection coefficient of the antenna structure provided by the embodiment of the utility model varies with frequency from 0.5 GHz to 3.0 GHz;

[0033] Figure 5 The far-field 3D radiation pattern of the antenna structure provided in the embodiment of the utility model at a frequency of 1.77 GHz;

[0034] Figure 6 The EH lobe diagram of the antenna structure provided by the embodiment of the utility model at the frequency point of 1.77 GHz;

[0035] Figure 7 The far-field 3D radiation pattern of the antenna structure provided in the embodiment of the utility model at a frequency of 0.89 GHz;

[0036] Figure 8 The EH surface lobe diagram of the antenna structure provided in the embodiment of the utility model at the frequency point of 0.89 GHz.

[0037] Among them, the reference numerals in the figure are:

[0038] 100. Antenna structure;

[0039] 10. base; 11. first substrate; 12. plug-in portion; 10a. first layer structure; 10b. feeder hole;

[0040] 20. radiator; 21. second substrate; 22. plug-in fitting part; 20a. second layer structure; 20b. functional layer structure; 20b1. feeding branch; 20b2. high-frequency resonance branch; 20b3. low-frequency resonance branch; 20b4. impedance adjustment branch; 20b5. feeding analog coaxial line; 20b21. first horizontal branch; 20b22. trapezoidal branch; 20b31. second horizontal branch; 20b32. first vertical branch; 20b41. third horizontal branch; 20b42. second vertical branch. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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.

[0045] Please refer to Figures 1 to 3 An embodiment of the present application provides an antenna structure 100 , including a base 10 and a radiator 20 .

[0046] The base 10 includes a first substrate 11, a plug-in portion 12 is provided on the first substrate 11, a first layer structure 10a is formed on the first substrate 11, the first layer structure 10a is used for grounding, and the plug-in portion 12 extends to the first layer structure 10a;

[0047] The radiator 20 includes a second substrate 21, on which is provided a plug-in mating portion 22 which is plugged and adapted to the plug-in portion 12, the plug-in portion 12 is electrically connected to the plug-in mating portion 22, a partial area of ​​the second substrate 21 forms a second layer structure 20a, the second layer structure 20a is used for grounding, the plug-in mating portion 22 extends to the second layer structure 20a, and the remaining area of ​​the second substrate 21 forms a functional layer structure 20b, the second layer structure 20a is arranged close to the first layer structure 10a, and the functional layer structure 20b is arranged far away from the first layer structure 10a.

[0048] It can be understood that both the base 10 and the radiator 20 can be made of printed circuit boards, which have lower costs, stronger corrosion resistance, and more flexible assembly compared to metal antennas.

[0049] Therefore, the first substrate 11 and the second substrate 21 are both made of printed circuit boards, the first layer structure 10a is the ground layer on the first substrate 11, and the second layer structure 20a is the ground layer on the second substrate 21. In this way, the area of ​​the ground layer of the overall antenna structure 100 is increased. As a reference ground for the monopole antenna mirror, the ground layer is a necessary condition for forming the monopole antenna effect, and the infinite ground plane is another resonant arm of the monopole antenna mirror.

[0050] At the same time, the radiator 20 is erected on the base 10 by plugging and connecting, and the plug-in portion 12 and the plug-in mating portion 22 are adapted to connect not only to realize the physical connection between the radiator 20 and the base 10 in space, but also to form an electrical connection relationship between the two. The functional layer structure 20b on the radiator 20 is used to realize the transmission and reception of low-frequency and / or high-frequency signals.

[0051] For example, the plug-in portion 12 is a plug-in hole formed on the base 10, and the plug-in mating portion 22 is a plug-in column formed on the radiator 20. The hole profile of the plug-in hole includes, but is not limited to, square, circular, elliptical, and diamond-shaped, and the cross-sectional shape of the plug-in column is adapted to the hole profile of the plug-in hole. At the same time, in order to meet the electrical connection between the two after the plug-in mating, a solder layer is formed in the hole wall of the plug-in hole, and the solder layer penetrates to the first layer structure 10a. At the same time, a solder layer is formed on the outer wall of the plug-in column, and the solder layer penetrates to the second layer structure 20a. In this way, after the plug-in column is plugged into the corresponding plug-in hole, the first layer structure 10a and the second layer structure 20a are electrically connected.

[0052] Of course, the plug-in portion 12 may also be a plug-in column formed on the base 10 , and the plug-in mating portion 22 may also be a plug-in hole formed on the radiator 20 , that is, the arrangement positions of the hole columns are swapped.

[0053] Furthermore, the radiator 20 being vertically disposed on the base 10 may mean that the plane where the radiator 20 is located is perpendicular to the plane where the base 10 is located, or the planes where the two are located form an acute angle.

[0054] The outer shape of the base 10 includes but is not limited to circular, oval, square, etc. Similarly, the outer shape of the radiator 20 includes but is not limited to square, triangle, circular, etc.

[0055] Optionally, the first substrate 11 of the base 10 is made of a glass fiber reinforced epoxy resin plate, the first substrate 11 is a circular plate, with a diameter of 85 mm, a thickness of 1.6 mm, a dielectric constant of 4.6, and a loss tangent of 0.019. The second substrate 21 of the radiator 20 is also made of a glass fiber reinforced epoxy resin plate, the second substrate 21 is a square plate, the length and width of the square plate are 80 mm and 50.6 mm respectively, the thickness is 1.2 mm, the dielectric constant is 4.6, and the loss tangent is 0.019.

[0056] The antenna structure 100 provided by the utility model, the base 10 and the radiator 20 are connected by plug-in matching. Specifically, the base 10 is provided with a plug-in portion 12, and the radiator 20 is provided with a plug-in matching portion 22 that plugs and matches with the plug-in portion 12, so that after the assembly is completed, the antenna structure 100 is a three-dimensional structure as a whole. At the same time, the second layer structure 20a and the functional layer structure 20b are respectively arranged in different areas of the second substrate 21 of the radiator 20 to meet the corresponding signal transmission requirements, and the second layer structure 20a is arranged close to the first layer structure 10a of the base 10, and the functional layer structure 20b is arranged away from the first layer structure 10a of the base 10. In this way, the overall structure of the antenna structure 100 provided by the present application is simpler, the manufacturing process is relatively simple, it is easy to mass produce, and it can also meet the needs of signal transmission in manholes.

[0057] Please refer to Figure 3 In some embodiments, the functional layer structure 20b includes a feeding branch 20b1, a high-frequency resonant branch 20b2 electrically connected to the feeding branch 20b1, a low-frequency resonant branch 20b3 electrically connected to the feeding branch 20b1, an impedance adjustment branch 20b4 electrically connected to the feeding branch 20b1 at one end, and a feeding simulated coaxial line 20b5. The feeding branch 20b1 is electrically connected to the second layer structure 20a through the feeding simulated coaxial line 20b5, and the other end of the impedance adjustment branch 20b4 is electrically connected to the second layer structure 20a.

[0058] It can be understood that the functional layer structure 20b is specifically used to meet and adapt to the signal transmission requirements in the manhole.

[0059] The feeding analog coaxial line 20b5 is used for connecting to the external signal input terminal.

[0060] The feeding branch 20b1 is used to output the input electrical signal at the feeding analog coaxial line 20b5 to the high-frequency resonance branch 20b2 and the low-frequency resonance branch 20b3.

[0061] The high-frequency resonance branch 20b2 provides resonance support for a specific frequency. Specifically, the high-frequency resonance branch 20b2 can be used to increase the gain of the antenna, improve the directivity of the antenna, reduce the beam width of the antenna, and so on.

[0062] The function of the low-frequency resonance branch 20b3 is similar to that of the high-frequency resonance branch 20b2. It is mainly for lower frequency signals. The low-frequency resonance branch 20b3 can provide resonance support, increase antenna efficiency, adjust impedance and increase antenna bandwidth.

[0063] The impedance adjustment branch 20b4 is used to adjust the input impedance of the antenna to match the impedance of the transmission line or the radio frequency device.

[0064] Usually, under the same dielectric conditions, each current-flowing length corresponds to a resonant frequency point f0. The higher the f0 frequency, the shorter the path through which the corresponding resonant current flows, and the shorter the antenna resonant arm; the lower the f0 frequency, the longer the path through which the corresponding resonant current flows, and the longer the antenna resonant arm. Due to the influence of its own frequency doubling, for an antenna without a bent array, while generating a local oscillation at f0, it will also generate frequency doubling resonances near odd-numbered frequency doubling points such as 3f0, 5f0, 7f0, etc. If the array is bent, the odd-numbered resonance points before the bend will shift left and right on the spectrum graph, that is, by bending, while generating resonance at f0, the frequency doubling resonance can also be controlled to fall on other desired designed frequency points. For example Figure 4 As shown, Figure 4 The antenna structure 100 provided in the embodiment of the present application is a graph showing the change of reflection coefficient with frequency from 0.5 GHz to 3.0 GHz; and the antenna forms resonances at two frequency points of 0.89 GHz and 1.77 GHz, and there is a certain bandwidth between the two resonances. Finally, a good resonance less than -6 dB is formed in the frequency bands of 0.82 GHz to 0.965 GHz and 1.528 GHz to 2.714 GHz, supporting the full frequency bands of LTE CAT1 and NB-IOT.

[0065] Please refer to Figure 3In some embodiments, the high-frequency resonant branch 20b2 includes a first horizontal branch 20b21 and a trapezoidal branch 20b22 connected to each other, and the first horizontal branch 20b21 is electrically connected to the feeding branch 20b1.

[0066] It can be understood that the structural combination of the first horizontal branch 20b21 and the trapezoidal branch 20b22 helps to improve the radiation impedance of the antenna, thereby improving the bandwidth.

[0067] Continue to refer Figure 4 , the generation of 1.77GHz frequency is mainly completed by the high-frequency resonant branch 20b2 local oscillator, and the current is mainly distributed at the first horizontal branch 20b21 and the trapezoidal branch 20b22. The RF signal flows from the feeding port through the feeding branch 20b1 to the first horizontal branch 20b21 and the trapezoidal branch 20b2 on the high-frequency resonant branch 20b2, and also flows through the impedance adjustment branch and returns to the second layer structure 20a. Among them, the trapezoidal branch 20b22 is a large-area gradient structure, which can increase the radiation resistance near the resonance point to improve the radiation efficiency and increase the bandwidth. The impedance adjustment branch is a short-circuit branch. Adjusting the size of the loop means changing the length of the short-circuit current path. Controlling the length of the short-circuit path is actually equivalent to controlling the size of the matching inductance and capacitance, thereby adjusting the resonant impedance. The high-frequency resonant branch 20b2 will also produce frequency doubling based on 1.77GHz. Finally, the resonance range is between 1.528GHz and 2.714GHz. As Figure 5 and Figure 6 ,in, Figure 5 and Figure 6 The far-field 3D radiation pattern and EH surface lobe pattern of this frequency point show that the radiation is omnidirectional near 1.77 GHz.

[0068] Please refer to Figure 3 In some embodiments, the low-frequency resonant branch 20b3 includes a second horizontal branch 20b31 and a first vertical branch 20b32 connected to each other, and the second horizontal branch 20b31 is electrically connected to the feeding branch 20b1.

[0069] It can be understood that the structural combination of the second horizontal branch 20b31 and the first vertical branch 20b32 can increase the effective area of ​​the low-frequency resonance branch 20b3, increase the radiation resistance near the resonance point, and ultimately improve the radiation efficiency and increase the bandwidth.

[0070] Continue to refer Figure 4, the generation of 0.89GHz frequency is mainly completed by the low-frequency resonant branch 20b3 local oscillator, and the current is mainly distributed in the second horizontal branch 20b31 and the first vertical branch 20b32. The RF signal flows from the feeding port through the feeding branch 20b1 to the second horizontal branch 20b31 and the first vertical branch 20b32 on the low-frequency resonant branch 20b3, and also flows through the impedance adjustment branch and returns to the second layer structure 20a. Among them, the second horizontal branch 20b31 and the first vertical branch 20b32 are of a wider area in order to increase the radiation resistance near the resonance point to improve the radiation efficiency and increase the bandwidth. The impedance adjustment branch 20b4 is a short-circuit branch. Adjusting the size of the loop also changes the length of the short-circuit current path. Controlling the length of the short-circuit path is actually equivalent to controlling the size of the matching inductance and capacitance, thereby adjusting the resonant impedance. The final resonance range is between 0.820GHz and 0.965GHz. As Figure 7 and Figure 8 ,in, Figure 7 and Figure 8 The far-field 3D radiation pattern and EH surface lobe pattern of this frequency point show that the radiation is omnidirectional near 0.89 GHz.

[0071] Please refer to Figure 3 In some embodiments, the impedance adjustment branch 20b4 includes a third horizontal branch 20b41 and a second vertical branch 20b42 connected to each other, the third horizontal branch 20b41 is electrically connected to the feeding branch 20b1, and the second vertical branch 20b42 is electrically connected to the second layer structure 20a.

[0072] It can be understood that the impedance adjustment branch 20b4 is a short-circuit branch. By adjusting the size of the loop formed by the impedance adjustment branch 20b4, the feeding branch, the feeding simulated coaxial line 20b5 and the second layer structure 20a, the path length of the short-circuit current can be changed, that is, controlling the length of the short-circuit path is equivalent to controlling the size of the matching inductance and capacitance, thereby adjusting the resonant impedance. Specifically, the horizontal length of the third horizontal branch 20b41 and the vertical length of the second vertical branch 20b42 can be adjusted.

[0073] Please refer to Figure 2 In some embodiments, the plug-in portion 12 is a square pad hole, and the plug-in mating portion 22 is a square pad, and the square pad is vertically plugged into the square pad hole.

[0074] It can be understood that the square pad is vertically inserted into the square pad hole to allow the radiator 20 to be vertically inserted into the base 10 .

[0075] Please refer to Figure 2 In some embodiments, the number of the square pad holes is two, the base 10 is a circular structure, and the square pad holes are arranged side by side along the length direction of the holes themselves, and are also symmetrically arranged about the center of the base 10.

[0076] In this way, the force-bearing positions between the base 10 and the radiator 20 are more balanced, which can effectively improve the structural stability of the connection position between the base 10 and the radiator 20 .

[0077] Please refer to Figure 2 and Figure 3 In some embodiments, a feed hole 10b is provided on the base 10, and the external wiring is connected to the feeding analog coaxial line 20b5 through the feed hole 10b.

[0078] The external signal line can be connected to the feeding simulated coaxial line 20 b 5 through the feed line hole 10 b to reduce the routing path of the external signal line in the antenna structure 100 .

[0079] In some embodiments, a through hole is provided on the base 10, and the antenna structure 100 further includes a shell having a hollow structure. The base 10 and the radiator 20 are disposed in the shell, and the shell is connected to the base 10 through the through hole.

[0080] The housing connects the base 10 and the radiator 20 to the housing, and the housing protects the base 10 and the radiator 20 .

[0081] Optionally, in the projection direction perpendicular to the plane where the base 10 is located, the radiator 20 falls within the projection area of ​​the base 10. In this way, the shell can cover the combined structure of the base 10 and the radiator 20 to ensure that the combined structure can be placed in the space inside the shell.

[0082] In actual use, the shell is a pressure-resistant shell. A hole is drilled on the paved road surface, and the pressure-resistant shell equipped with the base 10 and the radiator 20 is buried in the hole on the road surface. The feeder is connected to the telemetry terminal in the manhole through the opening on the pressure-resistant shell. Since the antenna structure 100 is outside the manhole, the wireless signal quality of the telemetry terminal is greatly improved.

[0083] In a second aspect, an embodiment of the present application further provides an underground manhole telemetry terminal, comprising the above-mentioned antenna structure 100.

[0084] The underground manhole telemetry terminal provided by the utility model has the above antenna structure 100, and the underground manhole telemetry terminal has a longer service life and a better communication effect.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An antenna structure, characterized in that: include: A base, the base comprising a first substrate, a plug-in portion being provided on the first substrate, a first layer structure being formed on the first substrate, the first layer structure being used for grounding, and the plug-in portion extending to the first layer structure; A radiator, the radiator comprising a second substrate, a plug-in mating portion being provided on the second substrate and being plugged and matched with the plug-in portion, the plug-in portion being electrically connected to the plug-in mating portion, a second layer structure being formed in a partial area of ​​the second substrate, the second layer structure being used for grounding, the plug-in mating portion extending to the second layer structure, the remaining area of ​​the second substrate forming a functional layer structure, the second layer structure being arranged close to the first layer structure, and the functional layer structure being arranged far away from the first layer structure.

2. The antenna structure according to claim 1, characterized in that: The functional layer structure includes a feeding branch, a high-frequency resonant branch electrically connected to the feeding branch, a low-frequency resonant branch electrically connected to the feeding branch, an impedance adjustment branch electrically connected to the feeding branch at one end, and a feeding simulation coaxial line. The feeding branch is electrically connected to the second layer structure through the feeding simulation coaxial line, and the other end of the impedance adjustment branch is electrically connected to the second layer structure.

3. The antenna structure according to claim 2, characterized in that: The high-frequency resonant branch includes a first horizontal branch and a trapezoidal branch connected to each other, and the first horizontal branch is electrically connected to the feeding branch.

4. The antenna structure according to claim 2, characterized in that: The low-frequency resonant branch includes a second horizontal branch and a first vertical branch connected to each other, and the second horizontal branch is electrically connected to the feeding branch.

5. The antenna structure according to claim 2, characterized in that: The impedance adjustment branch includes a third horizontal branch and a second vertical branch connected to each other, the third horizontal branch is electrically connected to the feeding branch, and the second vertical branch is electrically connected to the second layer structure.

6. The antenna structure according to any one of claims 1 to 5, characterized in that: The plug-in portion is a square pad hole, the plug-in mating portion is a square pad, and the square pad is vertically plugged into the square pad hole.

7. The antenna structure according to claim 6, characterized in that: The number of the square pad holes is two, the base is a circular structure, and the square pad holes are arranged side by side along the length direction of the holes themselves, and are also symmetrically arranged about the center of the base.

8. The antenna structure according to any one of claims 2 to 5, characterized in that: A feeder hole is provided on the base, and an external line is connected to the feed simulation coaxial line through the feeder hole.

9. The antenna structure according to any one of claims 1 to 5, characterized in that: A through hole is provided on the base, and the antenna structure further comprises a shell with a hollow structure. The base and the radiator are arranged in the shell, and the shell is connected to the base through the through hole.

10. A telemetry terminal for manholes, characterized in that: Comprising the antenna structure as claimed in any one of claims 1 to 9.

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