Device for monitoring track bogie and associated track bogie

Abstract

The invention proposes a device (8) for monitoring a rail truck. The apparatus comprises a printed circuit board (14), a sensing device (16) configured to measure at least one physical parameter of the track bogie, and a planar antenna (17) embedded in the printed circuit board, the planar antenna being configured to transmit the measurements communicated by the sensing device.

Description

Technical Field

[0001] The present invention relates to the monitoring of rail bogies.

[0002] More specifically, the invention relates to a device for monitoring a railway bogie and a railway bogie comprising such a device. Background Art

[0003] Typically, the freight cars of a train are placed on bogies.

[0004] The bogie includes axle boxes, each of which includes an axle supported by bearings and train drive wheels.

[0005] In order to monitor the bogie to detect faults in, for example, bearings, wireless monitoring equipment is usually fixed to the axlebox.

[0006] Wireless monitoring equipment measures vibration and temperature of the bogie and transmits the vibration and temperature measurements for further processing.

[0007] For transmitting the measurement results, the wireless monitoring device may comprise a ceramic antenna which is soldered to a printed circuit board PCB of the wireless monitoring device.

[0008] Since the wireless monitoring device is fixed on the bogie, the wireless monitoring device will be subject to vibration.

[0009] Vibrations of the bogie may cause the ceramic antenna to separate from the PCB by damaging solder joints or stripping copper from the PCB, thereby preventing the wireless monitoring device from transmitting measurements to monitor the bogie. Summary of the invention

[0010] Therefore, the present invention aims to propose an enhanced connection of the antenna on the PCB.

[0011] According to an aspect, a device for monitoring a railway bogie is proposed.

[0012] The device comprises a printed circuit board, a sensing device configured to measure at least one physical parameter of a railway truck, and a planar antenna embedded in the printed circuit board, the planar antenna configured to transmit the measurement results delivered by the sensing device.

[0013] The planar antenna is embedded in the PCB such that the planar antenna is directly located in the copper of the PCB.

[0014] Since the planar antenna is embedded in the PCB, the planar antenna cannot be separated from the PCB.

[0015] Preferably, the device comprises a housing and a fixing device arranged on an outer surface of the housing at a first end of the housing, and the printed circuit board is arranged inside the housing so that the planar antenna is located at a second end of the housing, and the second end of the housing is opposite to the first end of the housing.

[0016] Advantageously, the at least one physical parameter comprises one of a temperature of the railway bogie and a vibration of the railway bogie.

[0017] Advantageously, the printed circuit board supports the sensing device.

[0018] Preferably, the planar antenna comprises:

[0019] - a rectangular loop element comprising a first side element, a second side element parallel to the first side element, a first base element connecting a first end of the first side element to a first end of the second side element, and a second base element comprising a first end connected to the second end of the first side element and a second end forming a terminal of the antenna, the first side element being longer than the second side element,

[0020] - a rectangular element which is inserted into the rectangular loop element and comprises a recess, and

[0021] - An L-shaped element, which is inserted into said recess such that the longest side of the L-shaped element is parallel to the first base element.

[0022] Advantageously, the planar antenna comprises:

[0023] - a first rectangular element comprising a first side, a second side parallel to the first side, a third side connecting the first side to the second side and a fourth side parallel to the third side, the first side being longer than the third side,

[0024] - a first L-shaped element connected to the fourth side of the first rectangular element such that the longest side of the first L-shaped element prolongs the first side of the first rectangular element,

[0025] a second L-shaped element connected to the fourth side of the first rectangular element such that the longest side of the second L-shaped element extends the second side of the first rectangular element, and the end of the longest side of the second L-shaped element not connected to the fourth side of the first rectangular element forms a first terminal, and

[0026] - a second rectangular element comprising a first side extending the longest side of the second L-shaped element by a gap, a second side parallel to the first side with respect to the first L-shaped element, a third side connecting the first and second sides, the third side being related to the second L-shaped element, and a fourth side parallel to the third side, the second rectangular element forming a second terminal of the antenna.

[0027] Advantageously, the planar antenna comprises:

[0028] - a first straight element, a second straight element, a third straight element, a fourth straight element and a fifth straight element, each straight element having a first side, a second side parallel to the first side, a third side connecting the first side to the second side and a fourth side parallel to the third side, the first side being longer than the third side,

[0029] The first side of the first straight element, the first side of the second straight element and the first side of the third straight element are parallel,

[0030] The second straight element is arranged between the first and third straight elements,

[0031] The fourth straight element connects the first end of the first straight element and the first end of the third straight element, so that the first side of the fourth straight element is perpendicular to the first side of the first straight element.

[0032] A fifth straight element connects the second end of the first straight element and the first side of the second straight element, so that the first side of the fifth straight element is parallel to the first side of the fourth straight element, and

[0033] - A second straight element forms a terminal of the antenna.

[0034] Preferably, the planar antenna comprises:

[0035] - a first straight element, a second straight element, a third straight element and a fourth straight element, each straight element having a first side, a second side parallel to the first side, a third side connecting the first side to the second side and a fourth side parallel to the third side, the first side being longer than the third side,

[0036] - a first U-shaped element, a second U-shaped element and a third U-shaped element, each U-shaped element comprising a first branch, a second branch parallel to the first branch, and a base element, a first end of the first branch being connected to a first end of the base element and a first end of the second branch being connected to a second end of the base element,

[0037] The second end of the first branch of the first U-shaped element is connected to the first end of the first straight element, and the second end of the first branch of the second U-shaped element is connected to the second end of the first straight element, so that the base elements of the first and second U-shaped elements are parallel to the first side of the first straight element,

[0038] The first end of the second straight element is connected to the second side of the first straight element, so that the first side of the second straight element is perpendicular to the second side of the first straight element,

[0039] The second end of the second straight element forms the first terminal of the antenna and is connected to the first end of the third straight element so that the first side of the second straight element is perpendicular to the first side of the third straight element.

[0040] The second end of the third straight element is connected to the second end of the first branch of the third U-shaped element, so that the base element of the third U-shaped element is parallel to the first side of the first straight element, and the base element is located between the first straight element and the third straight element, and the second end of the second branch of the third U-shaped element forms the second terminal of the antenna,

[0041] The first end of the fourth straight element is connected to the second side of the first straight element, so that the first side of the fourth straight element is perpendicular to the second side of the first straight element, and the fourth straight element is located between the second straight element and the second U-shaped element, and

[0042] The second end of the fourth straight element forms a third terminal of the antenna.

[0043] Advantageously, the device further comprises a battery configured to power the planar antenna and the sensing device.

[0044] According to another aspect, a railway bogie is proposed comprising the device as defined above.

[0045] Preferably, the railway bogie further comprises an axle box, and the device is fixed to the axle box so that the device is located outside the railway bogie. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Other advantages and features of the present invention will appear, but are in no way limiting, from an examination of the detailed description of embodiments and the accompanying drawings, in which:

[0047] Figure 1 A train according to the invention is schematically shown;

[0048] Figure 2 Schematically shows an example of a device according to the invention for monitoring a railway bogie fixed to a partial view of an axle box;

[0049] Figure 3 An example of a device according to the invention is schematically shown,

[0050] Figure 4 schematically shows an example of the interior of a device according to the invention,

[0051] Figure 5 A first example of a planar antenna according to the invention is schematically shown,

[0052] Figure 6 A second example of a planar antenna according to the invention is schematically shown,

[0053] Figure 7 A third example of a planar antenna according to the invention is schematically shown, and

[0054] Figure 8A fourth example of a planar antenna according to the invention is schematically shown. DETAILED DESCRIPTION

[0055] refer to Figure 1 , which schematically shows a train 1 including a train freight car 2.

[0056] Each train freight car 2 comprises a rail bogie 3 including an axle box 4 .

[0057] Each axle box 4 includes a shaft 5 and a bearing 6 that supports the shaft 5 .

[0058] The axle 5 is driven by an electric motor or engine (not shown) and drives the wheels 7 of the bogie 3 .

[0059] A device 8 for monitoring the railway bogie is fixed to each axle box 4 so that the device 8 is located outside the railway bogie 4 .

[0060] The device 8 is intended to measure at least one physical parameter of the bogie 4 and to wirelessly transmit the measurement of the physical parameter to a processing unit 9 .

[0061] The processing unit 9 is used to process the received measurement results and to determine the wear state of the bogie 3, for example by determining the wear state of the bearing 6, the onset of wear of the wheel 7 or the axle box.

[0062] The physical parameter may be the temperature of the bogie or the vibrations to which the bogie is subjected.

[0063] In a variant, the device 8 is intended to measure two physical parameters, for example the temperature of the bogie and the vibrations of the bogie.

[0064] The device 8 and the processing unit 9 form a monitoring system for monitoring the railway bogie 3 .

[0065] Figure 2 An example of a device 8 fastened to a partial view of an axle box 4 is schematically shown.

[0066] The device 8 comprises a housing 10 and a fixing means 11 arranged on an outer surface of the housing 10 at a first end of the housing.

[0067] Figure 3 An example of a device 8 is schematically shown with a portion of the housing 10 removed.

[0068] The fixing means 11 comprises, for example, a flange and the axle box 4 comprises, for example, a pin which is inserted into the flange and fixed in the flange.

[0069] The housing 10 includes a case 10 a and a cover 10 b that closes the case 10 a.

[0070] The device 8 includes a battery 12 resting on the bottom of the housing 10a.

[0071] The housing 10 may further include a support member 13 located between the cover 10 b and the battery 12 .

[0072] The device 8 further comprises a printed circuit board PCB 14 fixed on the support member 13 so that the printed circuit board 14 can be visible when the cover 10b is removed from the housing 10a.

[0073] Figure 4 An example of the device 8 is shown when the cover 10b is removed from the housing 10a.

[0074] The PCB 14 is fixed to the support member 13 by means of screws 15 , for example.

[0075] The PCB 14 comprises a sensing device 16 intended to measure at least one physical parameter, an embedded planar antenna 17 , an antenna impedance matching circuit 18 connected to the planar antenna 17 , and a processing unit 19 .

[0076] The PCB 14 supports a sensing device 16 , an antenna impedance matching circuit 18 , and a processing unit 19 .

[0077] The processing unit 19 is intended to operate the sensing device 16 such that it delivers a measurement result of at least one physical parameter and to communicate the measurement result to the antenna impedance matching circuit 18 such that the planar antenna 17 communicates the measurement result to the processing unit 9 .

[0078] The battery 12 is intended to power the sensing device 16 and the processing unit 19 .

[0079] The PCB 14 is arranged inside the housing so that the planar antenna 17 is located at a second end of the housing 10a, which is opposite to the first end of the housing.

[0080] The planar antenna 17 is located outside the bogie 3 and as far away from the axle box 4 as possible, so that the electromagnetic waves emitted by the planar antenna 17 will not be interfered by the metal parts of the bogie 3.

[0081] The electromagnetic waves emitted by the planar antenna 17 may be radio waves.

[0082] The planar antenna 17 is embedded in the PCB 14 such that the planar antenna 17 is directly located in the copper of the PCB 14 .

[0083] Since the planar antenna 17 is embedded in the PCB 14 , the planar antenna 17 cannot be separated from the PCB 14 .

[0084] The planar antenna 17 is manufactured by known methods to realize an integrated circuit track.

[0085] Figure 5 A first example of a planar antenna 17 is schematically shown.

[0086] The planar antenna 17 includes a rectangular loop element 20 including a first side element 20 a and a second side element 20 b parallel to the first side element 20 a .

[0087] The rectangular loop element 20 further includes a first base element 20c connecting a first end of the first side element 20a to a first end of the second side element 20b and a second base element 20d having a first end connected to a second end of the first side element 20a.

[0088] The first side member 20a is longer than the second side member 20b.

[0089] The second end of the second side element 20 b forms a terminal 21 of the antenna connected to the impedance matching circuit 18 .

[0090] The planar antenna 17 further includes a rectangular element 22 which is inserted into the rectangular loop element 20 and includes a recess 22 a .

[0091] The planar antenna 17 comprises an L-shaped element 23 which is inserted into the recess 22a such that the longest side of the L-shaped element 23 is parallel to the first base element 20c.

[0092] Figure 6 A second example of a planar antenna 17 is schematically shown.

[0093] The planar antenna 17 includes a first rectangular element 24 including a first side 24a, a second side 24b parallel to the first side 24a, a third side 24c connecting the first side 24a to the second side 24b, and a fourth side 24d parallel to the third side 24c.

[0094] The first side 24a is longer than the third side 24c.

[0095] The planar antenna 17 further comprises a first L-shaped element 25 connected to the fourth side 24 d of the first rectangular element 24 such that the longest side of the first L-shaped element 25 extends the first side 24 a of the first rectangular element 24 .

[0096] The planar antenna 17 includes a second L-shaped element 26 connected to the fourth side 24 d of the first rectangular element 24 such that the longest side of the second L-shaped element 26 extends the second side 24 b of the first rectangular element 24 .

[0097] The end of the longest side of the second L-shaped element 26 that is not connected to the fourth side 24 d of the first rectangular element 24 forms a first terminal 27 .

[0098] The planar antenna 17 further comprises a second rectangular element 28 comprising a first side 28 a extending the longest side of the second L-shaped element 26 by a gap and a second side 28 b parallel to the first side 28 a with respect to the first L-shaped element 25 .

[0099] The second rectangular element 28 further includes a third side 28c connecting the first and second sides 28a, 28b.

[0100] The third side 28 c is associated with the second L-shaped element 26 .

[0101] The second rectangular element 28 includes a fourth side 28d parallel to the third side 28c.

[0102] The second rectangular element 28 forms a second terminal of the antenna and comprises a connection point 28e.

[0103] A connection point 28 e of the first terminal 27 and the second terminal 28 is connected to the impedance matching circuit 18 .

[0104] Figure 7 A third example of a planar antenna 17 is schematically shown.

[0105] The planar antenna includes a first straight element 29 , a second straight element 30 , a third straight element 31 , a fourth straight element 32 and a fifth straight element 33 .

[0106] Each straight element 29, 30, 31, 32, 33 has a first side 29a, 30a, 31a, 32a, 33a and a second side 29b, 30b, 31b, 32b, 33b parallel to the first side 29a, 30a, 31a, 32a, 33a.

[0107] Each straight element 29, 30, 31, 32, 33 also has a third side 29c, 30c, 31c, 32c, 33c connecting the first side 29a, 30a, 31a, 32a, 33a to the second side 29b, 30b, 31b, 32b, 33b and a fourth side 29d, 30d, 31d, 32d, 33d parallel to the third side 29c, 30c, 31c, 32c, 33c.

[0108] The first side edges 29a, 30a, 31a, 32a, 33a are longer than the third side edges 29c, 30c, 31c, 32c, 33c.

[0109] The first side 29a of the first straight element 29, the first side 30a of the second straight element 30, and the first side 31a of the third straight element 31 are parallel.

[0110] The second straight element 30 is arranged between the first and third straight elements 29 , 31 .

[0111] The fourth straight element 32 connects the first end of the first straight element 29 and the first end of the third straight element 31 , such that the first side 32 a of the fourth straight element 32 is perpendicular to the first side 29 a of the first straight element 29 .

[0112] The third side 29 c of the first straight element 29 contacts the second side 32 b of the fourth straight element 32 , and the third side 31 c of the third straight element 31 contacts the second side 32 b of the fourth straight element 32 .

[0113] The fifth straight element 33 connects the second end of the first straight element 29 and the first side 30 a of the second straight element 30 , such that the first side 33 a of the fifth straight element 33 is parallel to the first side 32 a of the fourth straight element 32 .

[0114] The third side 33 c of the fifth straight element 33 contacts the second side 29 b of the first straight element 29 , and the fourth side 33 c of the fifth straight element 33 contacts the first side 30 a of the first straight element 30 .

[0115] The second straight element 30 forms a terminal of the antenna and comprises a connection point 30e.

[0116] The connection point 30 e of the second straight element 30 is connected to the impedance matching circuit 18 .

[0117] Figure 8 A fourth example of a planar antenna 17 is schematically shown.

[0118] The planar antenna 17 includes a first straight element 34 , a second straight element 35 , a third straight element 36 , and a fourth straight element 37 .

[0119] Each straight element 34, 35, 36, 37 has a first side 34a, 35a, 36a, 37a and a second side 34b, 35b, 36b, 37b parallel to the first side 34a, 35a, 36a, 37a.

[0120] Each straight element 34,35,36,37 also has a third side 34c,35c,36c,37c connecting the first side 34a,35a,36a,37a to the second side 34b,35b,36b,37b and a fourth side 34d,35d,36d,37d parallel to the third side 34c,35c,36c,37c.

[0121] The planar antenna 17 further comprises a first U-shaped element 38 , a second U-shaped element 39 and a third U-shaped element 40 .

[0122] Each U-shaped element 38, 39, 40 comprises a first branch 38a, 39a, 40a, a second branch 38b, 39b, 40b parallel to the first branch 38a, 39a, 40a and a base element 38c, 39c, 40c.

[0123] A first end of the first branch 38a, 39a, 40a is connected to a first end of the base element 38c, 39c, 40c, and a first end of the second branch 38b, 39b, 40b is connected to a second end of the base element 38c, 39c, 40c.

[0124] The second end of the first branch 38a of the first U-shaped element 38 is connected to the first end of the first straight element 34, and the second end of the first branch 39a of the second U-shaped element 39 is connected to the second end of the first straight element 34, so that the base elements 38c and 39c of the first and second U-shaped elements 38 and 39 are parallel to the first side 34a of the first straight element 34.

[0125] The third side 34c of the first straight element 34 contacts the first side of the first branch 38a of the first U-shaped element 38, so that the second end of the second branch 38b of the first U-shaped element 38 is associated with the second side of the first straight element 34, and the fourth side 34d of the first straight element 34 contacts the first side of the first branch 39a of the second U-shaped element 39, so that the second end of the second branch 39b of the second U-shaped element 39 is associated with the second side of the first straight element 34.

[0126] The first end of the second straight element 35 is connected to the second side 34 b of the first straight element 34 , so that the first side 35 a of the second straight element 35 is perpendicular to the second side 34 b of the first straight element 34 .

[0127] The third side 35 c of the second straight element 35 contacts the second side 34 b of the first straight element 34 .

[0128] A second end of the second straight element 35 forms a first terminal of the antenna, so that, for example, a connection point 35 e on a fourth side 35 d of the second straight element 35 is connected to the impedance matching circuit 18 .

[0129] The second end of the second straight element 35 is connected to the first end of the third straight element 36 such that the first side 35 b of the second straight element 35 is perpendicular to the first side 36 a of the third straight element 36 .

[0130] The third side 36 c of the third straight element 36 contacts the first side 35 a of the second straight element 35 .

[0131] The second end of the third straight element 36 is connected to the second end of the first branch 40a of the third U-shaped element 40, so that the base element 40c of the third U-shaped element 40 is parallel to the first side 34a of the first straight element 34, and so that the base element 40c is located between the first straight element 34 and the third straight element 36.

[0132] A first side surface of the first branch 40 a of the third U-shaped element 40 is in contact with the fourth side 36 d of the third straight element 36 .

[0133] The second end of the second branch 40 b of the third U-shaped element 40 forms a first terminal of the antenna, so that for example a connection point 40 d of the second end of the second branch 40 b of the third U-shaped element 40 is connected to the impedance matching circuit 18 .

[0134] The first end of the fourth straight element 37 is connected to the second side 34 b of the first straight element 34 , so that the first side 37 a of the fourth straight element 37 is perpendicular to the second side 34 b of the first straight element 34 and the fourth straight element 37 is located between the second straight element 35 and the second U-shaped element 39 .

[0135] The third side surface 37 c of the fourth straight element 37 is in contact with the second side surface 34 b of the first straight element 34 .

[0136] A second end of the fourth straight element 37 forms a second terminal of the antenna, so that, for example, a connection point 37 e on a fourth side 37 d of the fourth straight element 37 is connected to the impedance matching circuit 18 .

[0137] According to the example of the planar antenna 17 connected to the impedance matching circuit 18 and according to the frequency range in which the planar antenna emits electromagnetic waves including the measurement results, a person skilled in the art can determine the arrangement and values ​​of capacitors and inductors to design the impedance matching circuit 18.

Claims

1. A device (8) for monitoring a railway bogie (3), comprising a printed circuit board (14), a sensing device (16) configured to measure at least one physical parameter of the railway bogie, and a planar antenna (17) embedded in the printed circuit board, the planar antenna being configured to transmit the measurement results delivered by the sensing device.

2. The device according to claim 1 comprises a housing (10) and a fixing device (11) arranged on the outer surface of the housing at a first end of the housing, and a printed circuit board (14) is arranged inside the housing so that the planar antenna (17) is located at a second end of the housing, and the second end of the housing is opposite to the first end of the housing.

3. The device according to claim 1 or 2, wherein: The at least one physical parameter comprises one of a temperature of the railway bogie and a vibration of the railway bogie.

4. The device according to any one of claims 1 to 3, wherein: The printed circuit board (14) supports the sensing device (16).

5. The device according to any one of claims 1 to 4, wherein: The planar antenna (17) comprises: - a rectangular loop element (20), comprising a first side element (20a), a second side element (20b) parallel to the first side element, a first base element (20c), and a second base element (20d), the first base element connecting a first end of the first side element to a first end of the second side element, the second base element comprising a first end connected to the second end of the first side element and a second end forming a terminal of the antenna, the first side element being longer than the second side element, - a rectangular element (22) which is inserted into the rectangular loop element and comprises a recess (22a), and - An L-shaped element (23) which is inserted into said recess such that the longest side of the L-shaped element is parallel to the first base element.

6. The device according to any one of claims 1 to 4, wherein: The planar antenna (17) comprises: - a first rectangular element (24) comprising a first side (24a), a second side (24b) parallel to the first side, a third side (24c) connecting the first side to the second side, and a fourth side (24d) parallel to the third side, the first side being longer than the third side, - a first L-shaped element (25) connected to the fourth side of the first rectangular element such that the longest side of the first L-shaped element extends the first side of the first rectangular element, - a second L-shaped element (26) connected to the fourth side of the first rectangular element, such that the longest side of the second L-shaped element extends the second side of the first rectangular element, and the end of the longest side of the second L-shaped element that is not connected to the fourth side of the first rectangular element forms a first terminal, and - a second rectangular element (28), comprising a first side (28a) extending the longest side of the second L-shaped element by a gap, a second side (28b) parallel to the first side with respect to the first L-shaped element, a third side (28c) connecting the first and second sides, the third side being related to the second L-shaped element, and a fourth side (28d) parallel to the third side, the second rectangular element forming a second terminal of the antenna.

7. The device according to any one of claims 1 to 4, wherein: The planar antenna (17) comprises: - a first straight element (29), a second straight element (30), a third straight element (31), a fourth straight element (32) and a fifth straight element (33), each straight element having a first side (29a, 30a, 31a, 32a), a second side (29b, 30b, 31b, 32b) parallel to the first side, a third side (29c, 30c, 31c, 32c) connecting the first side to the second side and a fourth side (29d, 30d, 31d, 32d) parallel to the third side, the first side being longer than the third side, The first side of the first straight element, the first side of the second straight element and the first side of the third straight element are parallel, The second straight element is arranged between the first and third straight elements, The fourth straight element connects the first end of the first straight element and the first end of the third straight element, so that the first side of the fourth straight element is perpendicular to the first side of the first straight element. A fifth straight element connects the second end of the first straight element and the first side of the second straight element, so that the first side of the fifth straight element is parallel to the first side of the fourth straight element, and - A second straight element forms a terminal of the antenna.

8. The device according to any one of claims 1 to 4, wherein: The planar antenna (17) comprises: - a first straight element (34), a second straight element (35), a third straight element (36) and a fourth straight element (37), each straight element (34, 35, 36, 37) having a first side (34a, 35a, 36a, 37a), a second side (34b, 35b, 36b, 37b) parallel to the first side, a third side (34c, 35c, 36c, 37c) connecting the first side to the second side and a fourth side (34d, 35d, 36d, 37d) parallel to the third side, the first side being longer than the third side, - a first U-shaped element (38), a second U-shaped element (39) and a third U-shaped element (40), each U-shaped element (38, 39, 40) comprising a first branch (38a, 39a, 40a), a second branch (38b, 39b, 40b) parallel to the first branch, and a base element (38c, 39c, 40c), the first end of the first branch being connected to the first end of the base element, the first end of the second branch being connected to the second end of the base element, The second end of the first branch of the first U-shaped element is connected to the first end of the first straight element, and the second end of the first branch of the second U-shaped element is connected to the second end of the first straight element, so that the base elements of the first and second U-shaped elements are parallel to the first side of the first straight element, The first end of the second straight element is connected to the second side of the first straight element, so that the first side of the second straight element is perpendicular to the second side of the first straight element, The second end of the second straight element forms the first terminal of the antenna and is connected to the first end of the third straight element so that the first side of the second straight element is perpendicular to the first side of the third straight element. The second end of the third straight element is connected to the second end of the first branch of the third U-shaped element, so that the base element of the third U-shaped element is parallel to the first side of the first straight element, and the base element is located between the first straight element and the third straight element, and the second end of the second branch of the third U-shaped element forms the second terminal of the antenna, The first end of the fourth straight element is connected to the second side of the first straight element, so that the first side of the fourth straight element is perpendicular to the second side of the first straight element, and the fourth straight element is located between the second straight element and the second U-shaped element, and The second end of the fourth straight element forms a third terminal of the antenna.

9. The device according to any one of claims 1 to 8, further comprising a battery (12) configured to supply power to the planar antenna (17) and the sensing device (16).

10. A railway bogie (3) comprising a device (8) according to any one of claims 1 to 9.

11. The railway bogie (3) according to claim 10, further comprising an axle box (4), the device being fixed to the axle box so that the device is located outside the railway bogie (3).

Images