A broadband monopole miniaturized antenna for ground penetrating radar and communication device

Abstract

The application relates to the technical field of communication antenna equipment, in particular to a wideband monopole miniaturized antenna for a borehole radar and a communication device. The antenna comprises a first structure and a second structure; the first structure comprises a second connecting rod and an antenna unit, one end of the second connecting rod is connected with a feed source, and the other end is connected with the antenna unit; the second structure comprises five dumbbell-shaped units; wherein, two adjacent dumbbell-shaped units and the first structure and the second structure are connected through electronic components; the dumbbell-shaped unit comprises a first connecting rod and an antenna unit arranged at two ends of the first connecting rod. The application adopts the form of a monopole antenna, so that the size of the antenna body is shortened by half, and cost is saved; the dumbbell-shaped unit is proposed, and a dielectric loading method is adopted; through calculation of the loading resistor position and parameters and adjustment of the geometric proportion of the antenna body shape, the bandwidth of the borehole antenna is increased, and the detection precision of the borehole radar is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication antenna devices, in particular to a wideband monopole miniaturized antenna for borehole radar and a communication device. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] As a special application of ground penetrating radar, borehole radar plays an important role in oil and mineral resource exploration, tunnel construction advanced prediction, geological exploration, etc. As a device for radiating electromagnetic energy into space and receiving reflected waves, the working performance of the antenna is crucial to the radar system. The main indicators for measuring the performance of the antenna include antenna bandwidth, polarization mode, gain size, radiation pattern, and voltage standing wave ratio. The structure pattern, geometric size, and material of the antenna are designed according to different application scenarios, and are usually divided into linear antennas, surface antennas, microstrip antennas, and array antennas. The antenna of the borehole radar is placed in the wellbore for work, so the actual use environment limits the geometric size of the antenna. Generally, the wellbore diameter is less than 15 cm, and the smaller the diameter of the antenna and the shorter the length, the larger the range of working conditions that can be used. In addition to the size limitation, the resolution of the radar system is affected by the bandwidth of the antenna. Increasing the bandwidth of the antenna can improve the resolution of the radar system, but will make the overall structure of the antenna complex. Common measures to change the bandwidth include reducing the radiation Q value of the antenna, changing the equivalent circuit, and adding an impedance matching network.

[0004] The dipole antenna is widely used because its geometric size meets the working conditions in the wellbore. Patent CN110994161B discloses an asymmetric dipole antenna, which is mainly composed of a left side column cavity oscillator and a right side planar oscillator. The antenna feed line needs to pass through the left side column cavity to reach the feed point. A resistance is loaded on the right side oscillator, and an impedance transformer is designed to complete impedance matching and improve the performance of the antenna. Patent CN113745824B discloses a dipole ground penetrating radar antenna. The antenna is fed by a feed line penetrating through the fixed tube, and a ferrite magnetic ring is sleeved outside the body. A resistance is symmetrically loaded at the feed point to realize an omnidirectional antenna. The above two antennas are relatively complex in manufacturing and assembling process while meeting the design requirements, and have a small bandwidth at low frequency. SUMMARY

[0005] In order to solve the problems in the prior art, the application provides a wideband monopole miniaturized antenna for a borehole radar and a communication device, which adopts a form of a monopole antenna, shortens the size of an antenna body by half, and saves cost; a dumbbell type unit is proposed and a method of dielectric loading is adopted, the position and parameters of a loaded resistor are calculated, and the geometric proportion of the shape of the antenna body is adjusted, so that the bandwidth of the borehole antenna is increased and the detection precision of the borehole radar is improved.

[0006] In order to achieve the above object, the application adopts the following technical scheme:

[0007] The first aspect of the application provides a wideband monopole miniaturized antenna for a borehole radar.

[0008] The wideband monopole miniaturized antenna for the borehole radar comprises:

[0009] a first structure and a second structure;

[0010] The first structure comprises a second connecting rod and an antenna unit, one end of the second connecting rod is connected to a feed source, and the other end of the second connecting rod is connected to the antenna unit;

[0011] The second structure comprises five dumbbell type units;

[0012] wherein two adjacent dumbbell type units and the first structure and the second structure are connected through electronic components; the dumbbell type unit comprises a first connecting rod and antenna units arranged at two ends of the first connecting rod.

[0013] Further, the antenna unit comprises a cylindrical base and a circular ring member.

[0014] Further, the cylindrical base and the circular ring member are integrally formed.

[0015] Further, the antenna unit is a disc-shaped structure composed of the cylindrical base and the circular ring member.

[0016] Further, the antenna unit is a cylindrical structure composed of the cylindrical base and the circular ring member.

[0017] Still further, the electronic components are installed at a gap between edges of two circular ring members.

[0018] Further, all the positions where the electronic components are installed are located on the same straight line.

[0019] Further, the length of the second connecting rod is greater than the length of the first connecting rod.

[0020] Still further, the electronic components comprise resistors.

[0021] Further, when resistors are used as electronic components, the resistors from far to near the feed point have resistance ratios of 5:4:3:2:1.

[0022] The second aspect of the present application provides a communication device as described in the first aspect.

[0023] A communication device comprises a glass fiber reinforced plastic shell and a broadband monopole antenna for borehole radar as described in the first aspect arranged in the glass fiber reinforced plastic shell.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] 1. A dumbbell-shaped monopole three-dimensional antenna is proposed for the performance indicators of large bandwidth and small size of a borehole radar antenna in geophysical scientific exploration instruments. By reasonably designing the shape and structure of the antenna, calculating the loading parameters and positions, the bandwidth is increased while the antenna is miniaturized, and the performance of the borehole radar antenna is further improved, thereby solving the problems of limited bandwidth and antenna size and structure of the borehole radar antenna.

[0026] 2. The present application proposes a monopole antenna that can be used for a borehole radar antenna. The design of the overall structure and shape of the antenna improves the performance of the borehole radar antenna. The structure and geometric shape of the dumbbell-shaped unit increase the overall surface area of the antenna, which is beneficial for electromagnetic wave radiation into space. The size of the gap between the units, the position and parameters of the loaded medium further improve the performance of the borehole radar antenna.

[0027] 3. The present application adopts the form of a monopole antenna, which shortens the size of the antenna body by half and saves costs. The dumbbell-shaped unit is proposed and the method of dielectric loading is adopted. By calculating the position and parameters of the loaded resistor and adjusting the geometric proportion of the shape of the antenna body, the bandwidth of the borehole antenna is increased, and the detection accuracy of the borehole radar is improved.

[0028] 4. The overall structure of the antenna designed in the present application is compact and flexible, and the antenna components can be processed modularly, which is easy to assemble and convenient for use in field environments. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings accompanying the specification of the present application form a part thereof and serve to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application and do not constitute an improper limitation thereof.

[0030] Figure 1 The structure diagram of the broadband monopole miniaturized antenna for borehole radar of the present application embodiment 1;

[0031] Figure 2 The cross-sectional view of the broadband monopole miniaturized antenna for borehole radar of the present application embodiment 1;

[0032] Figure 3 Figure 1 is a simulation diagram of an embodiment of the present application;

[0033] Wherein, 1-cylindrical base, 2-ring member, 3-first connecting rod, 4-distance between the upper edges of two adjacent ring members, 5-second connecting rod, 6-electronic component loading position, 7-feed point, 8-distance between two adjacent cylindrical bases. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains.

[0036] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of a feature, step, operation, device, component, and / or combination thereof.

[0037] In the present application, the terms such as "near", "end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the convenience of describing the structural relationship of the components or elements of the present application, and cannot be understood as a limitation of the present application.

[0038] In the present application, the terms such as "connected", "connected" and the like should be understood broadly, which means that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For related researchers or technicians in the art, the specific meaning of the above terms in the present application can be determined according to the specific circumstances, and cannot be understood as a limitation of the present application.

[0039] In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0040] Embodiment 1

[0041] As shown in Figure 1 , Figure 2 Embodiment 1 of the present application provides a broadband monopole miniaturized antenna for borehole radar, which comprises:

[0042] a first structure and a second structure;

[0043] The first structure comprises a second connecting rod 5 and an antenna unit, one end of the second connecting rod 5 being connected to the feed source and the other end being connected to the antenna unit;

[0044] The second structure comprises five dumbbell-shaped units;

[0045] The two adjacent dumbbell-shaped units and the first structure and the second structure are connected through electronic components, and the loading position of the electronic components is shown in the figure; the dumbbell-shaped unit comprises a first connecting rod 3 and an antenna unit arranged at both ends of the first connecting rod. Specifically, the length of the second connecting rod 5 is greater than the length of the first connecting rod 3.

[0046] The feed source is a circuit or device for transmitting signals from the transmitter to the antenna, and in this embodiment, it refers to a coaxial transmission line connected to the antenna, which is connected to the antenna at the feed point 7.

[0047] Specifically, the antenna unit comprises a cylindrical base 1 and a circular ring-shaped component 2, which are integrally formed.

[0048] The antenna unit can be a disc-shaped structure composed of a cylindrical base and a circular ring-shaped component, or a cylindrical structure composed of a cylindrical base and a circular ring-shaped component.

[0049] Specifically, the electronic components are mounted on the upper edge of the two adjacent circular ring-shaped components 6, and the five mounting positions of the electronic components are located on the same straight line. The electronic components can be resistors. The lower edge of the circular ring-shaped component is connected to the cylindrical base.

[0050] When resistors are used as electronic components, the resistances of the resistors from far to near are in the ratio of 5:4:3:2:1. The loaded resistors expand the bandwidth of the antenna without changing the geometric shape and structure of the antenna, and further improve the detection resolution of the radar system.

[0051] The structure and geometric size of the dumbbell-shaped unit are designed and optimized in this embodiment, and are matched with the first part, thereby improving the performance of the antenna. Specifically, the maximum diameter of the antenna body is located at the circular ring-shaped component, and the outer diameter is 90mm; the minimum diameter is the diameter of the connecting rod, which is 10mm. The length of the body is 402mm, the distance between the upper edges of the two adjacent circular ring-shaped components is 5mm, and the resistance ratio of the loaded resistors is 5:4:3:2:1.

[0052] The dumbbell-shaped unit designed in the embodiment increases the surface area of the three-dimensional antenna, wherein the antenna units on both sides of the dumbbell-shaped unit are recessed into a disc shape towards the middle, and the disc opening faces outward. When a plurality of dumbbell-shaped units are arranged in succession, the distance 8 between the two adjacent cylindrical bases is greater than the distance 4 between the upper edges of the two adjacent annular members, and the joint with the second connecting rod also adopts the disc-shaped structure, so that the antenna as a whole is beneficial to the excitation and transmission of surface current, and the radiation efficiency of the antenna is improved.

[0053] The components in the embodiment need to be precisely processed, and the electronic components are selected from industrial grade.

[0054] As shown in Figure 3 The embodiment is simulated on simulation software, the excitation signal is a Gaussian pulse signal, and the remaining parameters are the structural parameters of the antenna and the resistance value of the loaded resistance. Specifically, according to the position relationship from far to near with respect to the distance from the feed point, the actual resistance design values are 50Ω, 40Ω, 30Ω, 20Ω and 10Ω in sequence. The structural parameters are the distance between the upper edges of the two adjacent annular members, the geometric dimensions of the cylindrical base, the annular member, the first connecting rod and the second connecting rod. In this simulation, the diameter of the cylindrical base is 90mm, and the height is 2mm; the outer diameter of the annular member is 90mm, the inner diameter is 86mm, and the height is 5mm; the first connecting rod adopts a cylindrical structure, the diameter is 10mm, and the height is 30mm; the second connecting rod also adopts a cylindrical structure, the diameter is 10mm, and the height is 150mm; the distance between the upper edges of the two adjacent annular members is 5mm.

[0055] The simulation result graph is a waveform graph of frequency and return loss. This parameter is a main index for measuring the performance of the antenna, and the physical meaning can be understood as the ratio of the signal power reflected back to the 1 port to the 1 port transmission power. The larger the absolute value of S11 is, the better. Generally, when S11 is less than-10dB, the antenna is in working state in this frequency band. It can be seen that the antenna designed in the embodiment has good performance.

[0056] Embodiment 2

[0057] A communication device includes a glass steel shell and a broadband monopole miniaturized antenna for a ground penetrating radar as described in embodiment 1 disposed within the glass steel shell.

[0058] The antenna body is placed in the glass steel shell, the voids are filled with foam material to make the antenna stable, and the SMA connector is led out at the beginning of the antenna for connecting the feed source.

[0059] The maximum diameter of the antenna body is located at the circular ring part, and the outer diameter is 90 mm; the minimum diameter is the connecting rod diameter of 10 mm. The length of the body is 402 mm, and the geometric size of the designed communication device is about 450 mm*105 mm when the slot width is 5 mm. The small-sized antenna can be used not only in artificial boreholes but also in natural boreholes with a certain bending degree, thereby expanding the practical working condition range of the borehole radar system and improving the detection resolution of the radar system along the hole diameter.

[0060] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A wideband monopole miniaturized antenna for ground penetrating radar, characterized in that, Comprise: a first structure and a second structure; the first structure comprises a second connecting rod and a first antenna unit, one end of the second connecting rod is connected to a feed source, and the other end is connected to the first antenna unit; the second structure comprises five dumbbell-shaped units; wherein, two adjacent dumbbell-shaped units and the first structure and the second structure are connected through electronic components; the dumbbell-shaped unit comprises a first connecting rod and a second antenna unit arranged at both ends of the first connecting rod.

2. The compact broadband monopole antenna for ground penetrating radar of claim 1, wherein, The first antenna unit and the second antenna unit have the same structure, both comprising a cylindrical base and a circular ring-shaped member.

3. The compact wideband monopole antenna for ground penetrating radar according to claim 2, wherein, The cylindrical base and the circular ring-shaped member are integrally formed.

4. The compact wideband monopole antenna for ground penetrating radar of claim 2, wherein, The first antenna unit and the second antenna unit are both disc-shaped structures composed of a cylindrical base and a circular ring-shaped member. Or, The first antenna unit and the second antenna unit are both cylindrical structures composed of a cylindrical base and a circular ring-shaped member.

5. The compact wideband monopole antenna for ground penetrating radar of claim 4, wherein, The electronic components are installed at the gap between the edges of the two circular ring-shaped members.

6. The compact wideband monopole antenna for ground penetrating radar of claim 1, wherein, All the positions where the electronic components are installed are located on the same straight line.

7. The compact wideband monopole antenna for ground penetrating radar of claim 1, wherein, The length of the second connecting rod is greater than the length of the first connecting rod.

8. The compact wideband monopole antenna for ground penetrating radar according to any of claims 1-7, characterized in that, The electronic components comprise resistors.

9. The compact wideband monopole antenna for ground penetrating radar according to claim 8, wherein, When resistors are used as electronic components, the resistors from far to near from the feed point have a resistance ratio of 5:4:3:2:

1.

10. A communication device, characterized by A glass fiber reinforced plastic shell and a broadband monopole antenna for a borehole radar as claimed in any one of claims 1-9 disposed in the glass fiber reinforced plastic shell.

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