CN219759965U - Vehicle-mounted transponder antenna for rail inspection vehicle - Google Patents
Vehicle-mounted transponder antenna for rail inspection vehicle Download PDFInfo
- Publication number
- CN219759965U CN219759965U CN202321408908.7U CN202321408908U CN219759965U CN 219759965 U CN219759965 U CN 219759965U CN 202321408908 U CN202321408908 U CN 202321408908U CN 219759965 U CN219759965 U CN 219759965U
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- antenna
- btm
- transponder antenna
- transponder
- capacitor
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- 238000007689 inspection Methods 0.000 title claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 40
- 239000003990 capacitor Substances 0.000 claims description 46
- 239000004020 conductor Substances 0.000 claims description 12
- 229910001369 Brass Inorganic materials 0.000 claims description 6
- 239000010951 brass Substances 0.000 claims description 6
- 238000007142 ring opening reaction Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
Abstract
The utility model discloses a vehicle-mounted transponder antenna for a track inspection vehicle, and relates to the technical field of antennas for communication. The vehicle-mounted transponder antenna comprises a BTM antenna, a BTM antenna adjusting circuit, a transponder antenna adjusting circuit, a substrate and 2 BNC coaxial connectors; the transponder antenna is arranged in the center of the BTM antenna so as to reduce the space occupied by the vehicle-mounted transponder antenna; the BTM antenna and the transponder antenna are connected with respective adjusting circuits, and the input impedance of the antenna at the working frequency is 50 omega by optimizing the parameters of the adjusting circuits, so that the transmission of maximum power is realized. The utility model maintains the performance of the traditional vehicle-mounted transponder antenna and has the advantages of smaller size and convenient installation.
Description
Technical Field
The utility model relates to the technical field of antennas for communication, in particular to a vehicle-mounted transponder antenna.
Background
A rail inspection vehicle (rail inspection vehicle) is a special vehicle for detecting a rail irregularity condition in order to evaluate a rail geometry. An on-board transponder antenna with a frequency of 4.23 MHz is an important part of a rail car transponder system, and is mainly used for communicating with a ground transponder to acquire rail car position information and the like. When the ground transponder is a passive transponder, the rail car transponder system is required to transmit an activation signal to the ground transponder using a BTM antenna at a frequency of 27.095 MHz to power the passive transponder. At present, in an on-vehicle transponder antenna and a BTM antenna are arranged side by side on the same horizontal plane in an on-track inspection vehicle, so that the occupied space is large.
Disclosure of Invention
The technical problem to be solved by the utility model is how to provide a vehicle-mounted transponder antenna for a rail inspection vehicle, which has small size, stable performance and easy installation.
In order to solve the technical problems, the utility model adopts the following technical scheme: the vehicle-mounted transponder antenna for the track inspection vehicle comprises a substrate, wherein a BTM antenna is formed on the upper surface of the substrate, a first opening is formed on the BTM antenna, so that the BTM antenna is disconnected, two ends of a BTM antenna adjusting circuit are respectively connected with two ends of the BTM antenna, a first coaxial connector is connected to the BTM antenna loop, a shell of the coaxial connector is connected with one end of the BTM antenna, and an inner conductor of the first coaxial connector is connected with the other end of the BTM antenna; a transponder antenna is formed on the upper surface of the substrate on the inner side of the BTM antenna;
the transponder antenna is provided with a second opening, so that the transponder antenna is disconnected, two ends of the transponder antenna adjusting circuit are respectively connected with two ends of the transponder antenna, the transponder antenna is connected with a second coaxial connector, a shell of the second coaxial connector is connected with one end of the transponder antenna, and an inner conductor of the second coaxial connector is connected with the other end of the transponder antenna.
The further technical proposal is that: the BTM antenna is a rectangular loop antenna, is made of brass, and has a length of 290 DEG mm, a width of 190 DEG mm, a rectangular width of 12 DEG mm, and a first opening is positioned at the center of the bottom of the loop, wherein the width of the first opening is 1.55 DEG mm.
The further technical proposal is that: the transponder antenna is a rectangular ring antenna, is made of brass, and has a length of 200 mm, a width of 100 mm and a rectangular width of 12 mm. The ring opening is located at the center of the ring bottom, with the second opening width being 1.55. 1.55 mm.
Preferably, the substrate is an FR-4 substrate having a length of 300 a mm a width of 200 a mm a thickness of 1.6 a mm a.
The further technical proposal is that: three first metallized through holes are formed at two ends of the BTM antenna, the first metallized through holes penetrate through the BTM antenna and the substrate, the upper ends of the two first metallized through holes located at the left side are connected with the shell of the first coaxial connector through bonding pads, and the lower ends of the two first metallized through holes are connected with bonding pads on the back surface of the substrate; the upper end of a first metallized via hole positioned on the right side is connected with the inner conductor of the first coaxial connector through a bonding pad, and the lower end of the first metallized via hole is connected with the bonding pad on the back surface of the substrate.
The further technical proposal is that: three second metallized through holes are formed at two ends of the transponder antenna, the second metallized through holes penetrate through the transponder antenna and the substrate, the upper ends of the two second metallized through holes located at the left side are connected with the shell of the second coaxial connector through bonding pads, and the lower ends of the two second metallized through holes are connected with bonding pads on the back surface of the substrate; the upper end of a second metallized via hole positioned on the right side is connected with the inner conductor of the second coaxial connector through a bonding pad, and the lower end of the second metallized via hole is connected with the bonding pad on the back surface of the substrate.
Preferably, the diameter of the first metallized via hole and the second metallized via hole is 1.6mm.
The further technical proposal is that: the BTM antenna adjusting circuit comprises a capacitor C1, one end of the capacitor C1 is one wiring end of the BTM antenna adjusting circuit, the other end of the capacitor C1 is connected with one end of a resistor R1, the other end of the resistor R1 is divided into two paths, the first path is connected with one end of a capacitor C2, the second path is connected with one end of a capacitor C3, and the other end of the capacitor C2 is connected with the other end of the capacitor C3 to form the other wiring end of the BTM antenna adjusting circuit.
The further technical proposal is that: the transponder antenna regulating circuit comprises a capacitor C4, one end of the capacitor C4 is one wiring end of the transponder antenna regulating circuit, the other end of the capacitor C4 is connected with one end of a capacitor C5 through a resistor R2, and the other end of the capacitor C5 is the other connecting end of the transponder antenna regulating circuit.
Preferably, the electronics in the BTM antenna adjusting circuit and the electronics in the transponder antenna adjusting circuit are packaged by 0805.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the antenna disclosed by the utility model has the advantages of small size, convenience in installation and stable performance, and can be used for simultaneously printing the BTM antenna and the transponder antenna on the FR-4 substrate, meeting the return loss requirements of the vehicle-mounted transponder antenna at 4.23 MHz and 27.095 MHz and ensuring that the two antennas cannot be mutually influenced when working at a working frequency point.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of a vehicle-mounted transponder antenna according to the present utility model;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1 (excluding the coaxial connector);
FIG. 3 is an enlarged schematic view of the portion B of FIG. 1 (excluding the coaxial connector);
FIG. 4 is a graph of the reflection coefficient of an antenna according to the present utility model;
FIG. 5 is a graph of the isolation profile of an antenna according to the present utility model;
fig. 6 is a physical diagram of the antenna according to the present utility model;
wherein: 1. a substrate; 2. a BTM antenna; 3. a BTM antenna adjustment circuit; 4. a first coaxial connector; 5. a transponder antenna; 6. a transponder antenna adjustment circuit; 7. a second coaxial connector; 8. a bonding pad; 9. a first metallized via; 10. and a second metallized via.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.
As shown in fig. 1, the embodiment of the utility model discloses a vehicle-mounted transponder antenna for a rail inspection vehicle, which comprises a substrate 1, preferably, the substrate 1 is an FR-4 substrate, the length is 300 mm, the width is 200 mm, and the thickness is 1.6mm, and it is noted that the substrate can also be other types and sizes of substrates, and the specific model and size of the substrate are not repeated. A BTM antenna 2 is formed on the upper surface of the substrate 1, a first opening is formed on the BTM antenna 2, so that the BTM antenna 2 is disconnected, two ends of a BTM antenna adjusting circuit 3 are respectively connected with two ends of the BTM antenna 2, a first coaxial connector 4 is connected to the BTM antenna 2, a shell of the first coaxial connector 4 is connected with one end of the BTM antenna 2, and an inner conductor of the first coaxial connector 4 is connected with the other end of the BTM antenna 2; further, the BTM antenna 2 is a rectangular loop antenna, made of brass, having a length of 290 a mm a width of 190 a/mm a and a rectangular width of 12 a/mm a first opening at the center of the bottom of the loop, wherein the first opening has a width of 1.55 a/mm a.
Further, as shown in fig. 1, a transponder antenna 5 is formed on the upper surface of the substrate 1 on the inner side of the BTM antenna 2, the transponder antenna is located at the center of the BTM antenna, a second opening is formed on the transponder antenna 5, so that the transponder antenna 5 is disconnected, two ends of the transponder antenna adjusting circuit 6 are respectively connected with two ends of the transponder antenna 5, a second coaxial connector 7 is connected on the transponder antenna 5, a shell of the second coaxial connector 7 is connected with one end of the transponder antenna 5, and an inner conductor of the second coaxial connector 7 is connected with the other end of the transponder antenna 5. Preferably, the transponder antenna 5 is a rectangular loop antenna, made of brass, and has a length of 200 mm, a width of 100 mm, and a rectangular width of 12 mm. The ring opening is located at the center of the ring bottom, with the second opening width being 1.55. 1.55 mm.
Further, as shown in fig. 2, which is an enlarged schematic diagram of the portion a in fig. 1, three first metallized vias 9 are formed at two ends of the BTM antenna 2, the first metallized vias 9 pass through the BTM antenna 2 and the substrate 1, the upper ends of the two first metallized vias 9 located at the left side are connected with the housing of the first coaxial connector 4 through bonding pads 8, and the lower ends thereof are connected with the bonding pads 8 at the back of the substrate 1; the upper end of a first metallized via 9 on the right side is connected to the inner conductor of the first coaxial connector 4 via a pad 8, and the lower end is connected to the pad 8 on the back side of the substrate 1.
Wherein the left side pad size is 6mm ×5.5 mm and the right side pad size is 6mm ×6mm. The 2 coaxial connectors are connected with two antennas respectively by using metallized through holes, and the characteristic impedance is 50Ω. The ring opening size d, parameters of components in the BTM antenna adjusting circuit and the transponder antenna adjusting circuit affect the resonant frequency of the antenna.
Further, as shown in fig. 3, which is an enlarged schematic view of the portion B in fig. 1, three second metallized vias 10 are formed at two ends of the transponder antenna 5, the second metallized vias 10 pass through the transponder antenna 5 and the substrate 1, the upper ends of the two second metallized vias 10 located at the left side are connected with the housing of the second coaxial connector 7 through bonding pads, and the lower ends thereof are connected with bonding pads on the back surface of the substrate 1; the upper end of a second metallized via 10 on the right side is connected to the inner conductor of the second coaxial connector 7 via a pad 8, and the lower end is connected to the pad 8 on the back side of the substrate 1. Preferably, the diameter of the first metallized via hole 9 and the second metallized via hole 10 is 1.6mm.
The electronic components in the BTM antenna adjusting circuit 3 and the electronic components in the transponder antenna adjusting circuit 6 are packaged by 0805. Further, as shown in fig. 1 and fig. 2, the BTM antenna adjusting circuit 3 includes a capacitor C1, one end of the capacitor C1 is a terminal of the BTM antenna adjusting circuit 3, the other end of the capacitor C1 is connected with one end of a resistor R1, the other end of the resistor R1 is divided into two paths, the first path is connected with one end of a capacitor C2, the second path is connected with one end of a capacitor C3, the other end of the capacitor C2 is connected with the other end of the capacitor C3 to form another terminal of the BTM antenna adjusting circuit 3, wherein the capacitor C1 is 120 pF capacitor, the resistance value of the resistor R1 is 50Ω, the capacitor C2 is 100 pF capacitor, and the capacitor C3 is 9 pF capacitor.
Further, as shown in fig. 1 and 3, the transponder antenna adjustment circuit 6 includes a capacitor C4, one end of the capacitor C4 is a terminal of the transponder antenna adjustment circuit, the other end of the capacitor C4 is connected to one end of the capacitor C5 through a resistor R2, the other end of the capacitor C5 is another connection end of the transponder antenna adjustment circuit 6, where the capacitor C4 is a capacitor 5 nF, the resistor R2 is a resistor 50 Ω, and the capacitor C5 is a capacitor 100 nF.
The vehicle-mounted transponder antenna provided by the utility model is processed and the performance of the vehicle-mounted transponder antenna is tested by using an Aglient E5063A vector network analyzer. The reflection coefficients of the transponder antenna (1 port) and the BTM antenna (2 port) are measured as shown in fig. 4. As can be seen, the reflection coefficients of the transponder antenna and the BTM antenna are less than-10 dB at the frequency points of 4.23 MHz and 27.095 MHz, respectively. The measured isolation between the transponder antenna and the BTM antenna is shown in fig. 5. From the figure, the mutual coupling of the two antennas at the frequency points of 4.23 MHz and 27.095 MHz is less than-10 dB and-60 dB respectively. A physical photograph of the antenna of the vehicle-mounted transponder provided by the utility model is shown in figure 6.
The antenna disclosed by the utility model has the advantages that the BTM antenna and the transponder antenna are printed on the FR-4 substrate at the same time, the return loss requirements of the vehicle-mounted transponder antenna at 4.23 MHz and 27.095 MHz are met, the two antennas cannot be mutually influenced when working at working frequency points, the size is small, and the installation is convenient.
Claims (10)
1. A vehicle-mounted transponder antenna for a rail inspection vehicle, characterized by: the BTM antenna comprises a substrate (1), wherein a BTM antenna (2) is formed on the upper surface of the substrate (1), a first opening is formed on the BTM antenna (2) so that the BTM antenna (2) is disconnected, two ends of a BTM antenna adjusting circuit (3) are respectively connected with two ends of the BTM antenna (2), a first coaxial connector (4) is connected to the BTM antenna (2), a shell of the first coaxial connector (4) is connected with one end of the BTM antenna (2), and an inner conductor of the first coaxial connector (4) is connected with the other end of the BTM antenna (2); a transponder antenna (5) is formed on the upper surface of the substrate (1) on the inner side of the BTM antenna (2);
the transponder antenna (5) is provided with a second opening, so that the transponder antenna (5) is disconnected, two ends of the transponder antenna adjusting circuit (6) are respectively connected with two ends of the transponder antenna (5), the transponder antenna (5) is connected with a second coaxial connector (7), a shell of the second coaxial connector (7) is connected with one end of the transponder antenna (5), and an inner conductor of the second coaxial connector (7) is connected with the other end of the transponder antenna (5).
2. An on-board transponder antenna for a rail inspection vehicle as set forth in claim 1, wherein: the BTM antenna (2) is a rectangular loop antenna, and is made of brass, and has the length of 290 DEG mm, the width of 190 DEG mm, the rectangular width of 12 DEG mm, the first opening is positioned at the center of the bottom of the loop, and the width of the first opening is 1.55 DEG mm.
3. An on-board transponder antenna for a rail inspection vehicle as set forth in claim 1, wherein: the transponder antenna (5) is a rectangular ring antenna, the manufacturing material is brass, the length is 200 mm, the width is 100 mm, the rectangular width is 12 mm, the ring opening is positioned at the center of the bottom of the ring, and the second opening width is 1.55 mm.
4. An on-board transponder antenna for a rail inspection vehicle as set forth in claim 1, wherein: the substrate (1) used was an FR-4 substrate, having a length of 300 mm, a width of 200 mm and a thickness of 1.6mm.
5. An on-board transponder antenna for a rail inspection vehicle as set forth in claim 1, wherein: three first metallized through holes (9) are formed at two ends of the BTM antenna (2), the first metallized through holes (9) penetrate through the BTM antenna (2) and the substrate (1), the upper ends of the two first metallized through holes (9) at the left side are connected with the shell of the first coaxial connector (4) through bonding pads (8), and the lower ends of the two first metallized through holes are connected with the bonding pads (8) at the back of the substrate (1); the upper end of a first metallized via hole (9) positioned on the right side is connected with the inner conductor of the first coaxial connector (4) through a bonding pad (8), and the lower end of the first metallized via hole is connected with the bonding pad (8) on the back of the substrate (1).
6. An on-board transponder antenna for a rail inspection vehicle according to claim 5, wherein: three second metallized through holes (10) are formed at two ends of the transponder antenna (5), the second metallized through holes (10) penetrate through the transponder antenna (5) and the substrate (1), the upper ends of the two second metallized through holes (10) at the left side are connected with the shell of the second coaxial connector (7) through bonding pads, and the lower ends of the two second metallized through holes are connected with the bonding pads at the back of the substrate (1); the upper end of a second metallized via hole (10) positioned on the right side is connected with the inner conductor of the second coaxial connector (7) through a bonding pad (8), and the lower end of the second metallized via hole is connected with the bonding pad (8) on the back of the substrate (1).
7. An on-board transponder antenna for a rail inspection vehicle according to claim 5 or 6, wherein: the diameters of the first metallized via hole (9) and the second metallized via hole (10) are 1.6mm.
8. An on-board transponder antenna for a rail inspection vehicle as set forth in claim 1, wherein: the BTM antenna adjusting circuit (3) comprises a capacitor C1, one end of the capacitor C1 is one wiring end of the BTM antenna adjusting circuit (3), the other end of the capacitor C1 is connected with one end of a resistor R1, the other end of the resistor R1 is divided into two paths, the first path is connected with one end of a capacitor C2, the second path is connected with one end of the capacitor C3, and the other end of the capacitor C2 is connected with the other end of the capacitor C3 to form the other wiring end of the BTM antenna adjusting circuit (3).
9. An on-board transponder antenna for a rail inspection vehicle as set forth in claim 1, wherein: the transponder antenna adjusting circuit (6) comprises a capacitor C4, one end of the capacitor C4 is one wiring end of the transponder antenna adjusting circuit, the other end of the capacitor C4 is connected with one end of a capacitor C5 through a resistor R2, and the other end of the capacitor C5 is the other connecting end of the transponder antenna adjusting circuit (6).
10. An on-board transponder antenna for a rail inspection vehicle as claimed in claim 8 or 9, wherein: the electronic components in the BTM antenna adjusting circuit (3) and the electronic components in the transponder antenna adjusting circuit (6) are packaged by 0805.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321408908.7U CN219759965U (en) | 2023-06-05 | 2023-06-05 | Vehicle-mounted transponder antenna for rail inspection vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321408908.7U CN219759965U (en) | 2023-06-05 | 2023-06-05 | Vehicle-mounted transponder antenna for rail inspection vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219759965U true CN219759965U (en) | 2023-09-26 |
Family
ID=88086779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321408908.7U Active CN219759965U (en) | 2023-06-05 | 2023-06-05 | Vehicle-mounted transponder antenna for rail inspection vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219759965U (en) |
-
2023
- 2023-06-05 CN CN202321408908.7U patent/CN219759965U/en active Active
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