Railway bogie monitoring device and associated railway bogie

Abstract

Railway bogie monitoring device and associated railway bogie. The invention relates to a railway bogie monitoring device (8). The device comprises a printed circuit board (14), sensing means (16) configured to measure at least one physical parameter of the railway bogie, and a planar antenna (17) integrated into the printed circuit board, the planar antenna being configured to transmit measurements delivered by the sensing means. Reference: Figure 4

Description

Title of the invention: Railway bogie monitoring device and associated railway bogie

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

[0002] More particularly, the invention relates to a device for monitoring railway bogies and a railway bogie comprising such a device.

[0003] Generally, a train wagon rests on bogies.

[0004] A bogie comprises axle boxes, each axle box comprising an axle supported by bearings and driving wheels of the train.

[0005] In order to monitor the bogie to detect, for example, a bearing failure, a wireless monitoring device is generally attached to the axle box.

[0006] The wireless monitoring device can measure vibrations and temperature of the bogie and transmits the vibration and temperature measurements for further processing.

[0007] To transmit the measurements, the wireless monitoring device may include a ceramic antenna solder on a PCB printed circuit board of the wireless monitoring device.

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

[0009] Vibrations of the bogie can detach the ceramic antenna from the PCB by breaking the solder joints or tearing the copper off the PCB so that the wireless monitoring device cannot transmit measurements to monitor the bogie.

[0010] Therefore, the present invention intends to propose to improve the connection of the antenna on the PCB.

[0011] According to one aspect, a railway bogie monitoring device is provided.

[0012] The device comprises a printed circuit board, detection means configured to measure at least one physical parameter of the railway bogie and a planar antenna integrated into the printed circuit board, the planar antenna being configured to transmit measurements delivered by the detection means.

[0013] The planar antenna is integrated into the PCB so that the planar antenna is directly in the copper of the PCB.

[0014] Since the planar antenna is integrated into the PCB, it cannot be detached from the PCB.

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

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

[0017] Advantageously, the printed circuit board supports the detection means.

[0018] Preferably, the planar antenna comprises:

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

[0020] - a rectangular element inserted into the rectangular loop and comprising a obviously, and

[0021] - an L-shaped element inserted into the recess so that the longer side of the L-shaped element is parallel to the first base element. Advantageously, the planar antenna comprises:

[0022] - 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,

[0023] - a first L-shaped element connected to the fourth side of the first rectangular element so that the longest side of the first L-shaped element extends the first side of the first rectangular element,

[0024] - a second L-shaped element connected to the fourth side of the first rectangular element such that the longer side of the second L-shaped element extends the second side of the first rectangular element, the end of the longer side of the second L-shaped element which is not connected to the fourth side of the first rectangular element forming a first terminal, and

[0025] - a second rectangular element comprising a first side extending the side the longest of the second L-shaped element with a gap, a second side parallel to the first side facing the first L-shaped element, a third side connecting the first and second sides, the third side facing the second L-shaped element, and a fourth side parallel to the third side, the second rectangular element forming a second terminal of said antenna.

[0026] Advantageously, the planar antenna comprises:

[0027] - 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,

[0028] 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 being parallel,

[0029] the second straight element being arranged between the first and third straight elements,

[0030] the fourth straight element connecting a first end of the first straight element and a first end of the third straight element such that the first side of the fourth straight element is perpendicular to the first side of the first straight element,

[0031] the fifth straight element connecting the second end of the first straight element and the first side of the second straight element such that the first side of the fifth straight element is parallel to the first side of the fourth straight element, and

[0032] - the second straight element forming a terminal of said antenna.

[0033] Preferably, the planar antenna comprises:

[0034] - 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,

[0035] - a first U-shaped element, a second U-shaped element and a third U-shaped element U, 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,

[0036] the second end of the first branch of the first U-shaped element being connected to a first end of the first straight element and the second end of the first branch of the second U-shaped element being connected to the second end of the first straight element such that the base element of the first and second U-shaped elements is parallel to the first side of the first straight element,

[0037] a first end of the second straight element being connected to the second side of the first straight element such that the first side of the second straight element is perpendicular to the second side of the first straight element,

[0038] the second end of the second straight element forming a first terminal of said antenna and being connected to a first end of the third straight element of so that the first side of the second straight element is perpendicular to the first side of the third straight element,

[0039] the second end of the third straight element being connected to the second end of the first branch of the third U-shaped element, such that the base element of the third U-shaped element is parallel to the first side of the first straight element and such that the base element is located between the first straight element and the third straight element, the second end of the second branch of the third U-shaped element forming a second terminal of said antenna,

[0040] the first end of the fourth straight element being connected to the second side of the first straight element such that the first side of the fourth straight element is perpendicular to the second side of the first straight element and such that the fourth straight element is located between the second straight element and the second U-shaped element, and

[0041] the second end of the fourth straight element forming a third terminal of said antenna.

[0042] Advantageously, the device further comprises a battery configured to power the planar antenna and the detection means.

[0043] According to another aspect, a railway bogie comprising a device as defined above is provided.

[0044] Preferably, the railway bogie further comprises an axle box, the device being fixed to the axle box such that the device is located on an outer side of the railway bogie.

[0045] Other advantages and characteristics of the invention will appear on examining the detailed description of embodiments, which are in no way limiting, and the appended drawings in which:

[0046] [Fig.l] schematically illustrates a train according to the invention,

[0047] [Fig.2] schematically illustrates an example of a monitoring device for railway bogie fixed on a partial view of an axle box according to the invention,

[0048] [Fig. 3] schematically illustrates an example of the device according to the invention,

[0049] [Fig.4] schematically illustrates an example of the interior of the device according to the invention,

[0050] [Fig.5] schematically illustrates a first example of a planar antenna according to the invention,

[0051] [Fig.6] schematically illustrates a second example of the planar antenna according to the invention,

[0052] [Fig.7] schematically illustrates a third example of the planar antenna according to the invention, and

[0053] [Fig.8] schematically illustrates a fourth example of the planar antenna according to the invention.

[0054] We refer to [Fig.l] which schematically represents a train 1 comprising railway wagons 2.

[0055] Each railway wagon 2 comprises a railway bogie 3 comprising axle boxes 4.

[0056] Each axle box 4 comprises a shaft 5 and bearings 6 supporting the shaft 5.

[0057] The shaft 5 is driven by an electric motor or a motor (not shown) and drives wheels 7 of the bogie 3.

[0058] A railway bogie monitoring device 8 is attached to each axle box 4 such that the device 8 is located on an outer side of the railway bogie 4.

[0059] The device 8 is intended to measure at least one physical parameter of the bogie 4 and to wirelessly transmit the measurements of the physical parameter to a processing unit 9.

[0060] The processing unit 9 is intended to process the measurements received and to determine the state of wear of the bogie 3, for example by determining the state of wear of the bearings 6, the start of wear of the wheels 7 or of the axle box.

[0061] The physical parameter can be the temperature of the bogie or the vibrations experienced by the bogie.

[0062] Alternatively, the device 8 is intended to measure two physical parameters, for example the temperature of the bogie and the vibrations of the bogie.

[0063] The devices 8 and the processing unit 9 form a monitoring system for monitoring railway bogies 3.

[0064] [Fig.2] schematically illustrates an example of the device 8 fixed on a partial view of the axle box 4.

[0065] The device 8 comprises a housing 10 and fixing means 11 arranged at a first end of the housing on an external surface of the housing 10.

[0066] [Fig. 3] schematically illustrates an example of the device 8 in which a part of the housing 10 is removed.

[0067] The fixing means 11 comprise for example a flange and the axle box 4 comprises for example a rod, the rod being inserted into the flange and fixed in the flange.

[0068] The housing 10 comprises an enclosure 10a and a cover 10b closing the enclosure 10a.

[0069] The device 8 comprises batteries 12 resting on the bottom of the enclosure 10a.

[0070] The housing 10 may further comprise a support piece 13 located between the cover 10b and the batteries 12.

[0071] The device 8 further comprises a printed circuit board PCB 14 fixed on the support 13 so that the printed circuit board 14 is visible when the cover 10b is removed from the enclosure 10a.

[0072] [Fig.4] illustrates the example of the device 8 when the cover 10b is removed from the enclosure 10a.

[0073] The PCB 14 is fixed to the support part 13 for example by screws 15.

[0074] The PCB 14 comprises detection means 16 intended to measure P at least one physical parameter, an integrated planar antenna 17, an antenna impedance matching circuit 18 connected to the planar antenna 17 and a processing unit 19.

[0075] The PCB 14 supports the detection means 16, the antenna impedance matching circuit 18 and the processing unit 19.

[0076] The processing unit 19 is intended to implement the detection means 16 so that the detection means 16 deliver measurements of the at least one physical parameter, and is intended to transmit the measurements to the antenna impedance matching circuit 18 so that the planar antenna 17 transmits the measurements to the processing unit 9.

[0077] The batteries 12 are intended to supply energy to the detection means 16 and the processing unit 19.

[0078] The PCB 14 is arranged within the housing such that the planar antenna 17 is located at a second end of the housing 10a, the second end of the housing 10a being opposite the first end of the housing.

[0079] The planar antenna 17 is located on an external side of the bogie 3 and as far as possible from the axle box 4 so that electromagnetic waves emitted by the planar antenna 17 are not disturbed by metal parts of the bogie 3.

[0080] The electromagnetic waves emitted by the planar antenna 17 may be radio waves.

[0081] The planar antenna 17 is integrated into the PCB 14 so that the planar antenna 17 is directly in the copper of the PCB 14.

[0082] Since the planar antenna 17 is integrated into the PCB 14, the planar antenna 17 cannot be detached from the PCB 14.

[0083] The planar antenna 17 is manufactured using known methods for producing integrated circuit tracks.

[0084] [Fig.5] schematically illustrates a first example of the planar antenna 17.

[0085] The planar antenna 17 comprises a rectangular loop element 20 comprising a first lateral element 20a and a second lateral element 20b parallel to the first lateral element 20a.

[0086] The rectangular loop element 20 further comprises a second base element 20c connecting a first end of the first side element 20a to the first end of the second side element 20b and a second base element 20d comprising a first end connected to the second end of the first side element 20a.

[0087] The first side element 20a is longer than the second side element 20b.

[0088] The second end of the second lateral element 20b forms a terminal 21 of said antenna connected to the impedance matching circuit 18.

[0089] The planar antenna 17 further comprises a rectangular element 22 inserted into the rectangular loop 20 and comprising a recess 22a.

[0090] The planar antenna 17 comprises an L-shaped element 23 inserted into the recess 22a such that the longer side of the L-shaped element 23 is parallel to the first base element 22a.

[0091] [Fig.6] schematically illustrates a second example of the planar antenna 17.

[0092] The planar antenna 17 comprises a first rectangular element 24 comprising 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.

[0093] The first side 24a is longer than the third side 24c.

[0094] The planar antenna 17 further comprises a first L-shaped element 25 connected to the fourth side 24d of the first rectangular element 24 such that the longest side of the first L-shaped element 25 extends the first side 24a of the first rectangular element 24.

[0095] The planar antenna 17 comprises a second L-shaped element 26 connected to the fourth side 24d of the first rectangular element 24 such that the longer side of the second L-shaped element 26 extends the second side 24b of the first rectangular element 24.

[0096] The end of the longer side of the second L-shaped element 24 which is not connected to the fourth side 24d of the first rectangular element 24 forms a first terminal 27.

[0097] The planar antenna 17 further comprises a second rectangular element 28 comprising a first side 28a extending the longer side of the second L-shaped element 27 with a gap, a second side 28b parallel to the first side 28a facing the first L-shaped element 25.

[0098] The second rectangular element 28 further comprises a third side 28c connecting the first and second sides 28a, 28b.

[0099] The third side 28c faces the second L-shaped element 26.

[0100] The second rectangular element 28 comprises a fourth side 28d parallel to the third side 28c.

[0101] The second rectangular element 28 forms a second terminal of said antenna and comprises a connection point 28e.

[0102] The first terminal 27 and the connection point 28e of the second terminal 28 are connected to the impedance matching circuit 18.

[0103] [Fig.7] schematically illustrates a third example of the planar antenna 17.

[0104] The planar antenna 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.

[0105] Each straight element 29, 30, 31, 32, 33 has a first side 29a, 30a, 31a, 32a, 33a, a second side 29b, 30b, 31b, 32b, 33b parallel to the first side 29a, 30a, 31a, 32a, 33a.

[0106] Each straight element 29, 30, 31, 32, 33 further 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.

[0107] The first side 29a, 30a, 31a, 32a, 33a is longer than the third side 29c, 30c, 31c, 32c, 33c.

[0108] 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.

[0109] The second straight element 30 is arranged between the first and third straight elements 29, 31.

[0110] The fourth straight element 32 connects a first end of the first straight element 29 and a first end of the third straight element 31 such that the first side 32a of the fourth straight element 32 is perpendicular to the first side 29a of the first straight element 29.

[0111] The third side 29c of the first straight element 29 is in contact with the second side 32b of the fourth straight element 32 and the third side 31c of the third straight element 31 is in contact with the second side 32b of the fourth straight element 32.

[0112] The fifth straight element 33 connects the second end of the first straight element 29 and the first side 30a of the second straight element 30 so that the first side 33a of the fifth straight element 33 is parallel to the first side 32a of the fourth straight element 32.

[0113] The third side 33c of the fifth right element 33 is in contact with the second side 29b of the first right element 29 and the fourth side 33c of the fifth right element 33 is in contact with the first side 30a of the first right element 30.

[0114] The second straight element 30 forms a terminal of said antenna and comprises a connection point 30e.

[0115] The connection point 30e of the second right element 30 is connected to the impedance matching circuit 18.

[0116] [Fig.8] schematically illustrates a fourth example of the planar antenna 17.

[0117] The planar antenna 17 comprises a first straight element 34, a second element right 35, a third right element 36 and a fourth right element 37.

[0118] 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.

[0119] Each straight element 34, 35, 36, 37 further 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] The second end of the first branch 38a of the first U-shaped element 38 is connected to a 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 such that the base element 38c, 39c of the first and second U-shaped elements 38, 39 is parallel to the first side 34a of the first straight element 34.

[0124] The third side 34c of the first straight element 34 is in contact with a first side of the first branch 38a of the first U-shaped element 38 such that the second end of the second branch 38b of the first U-shaped element 38 faces the second side of the first straight element 34 and the fourth side 34d of the first straight element 34 is in contact with a first side of the first branch 39a of the second U-shaped element 39 such that the second end of the second branch 39b of the second U-shaped element 39 faces the second side of the first straight element 34.

[0125] A first end of the second straight element 35 is connected to the second side 34b of the first straight element 34 such that the first side 35a of the second straight element 35 is perpendicular to the second side 34b of the first straight element 34.

[0126] The third side 35c of the second straight element 35 is in contact with the second side 34b of the first straight element 34.

[0127] The second end of the second straight element 35 forms a first terminal of said antenna so that for example a connection point 35e of the fourth side 35d of the second straight element 35 is connected to the impedance matching circuit 18.

[0128] The second end of the second straight element 35 is connected to a first end of the third straight element 36 such that the first side 35b of the second straight element 35 is perpendicular to the first side 36a of the third straight element 36.

[0129] The third side 36c of the third right element 36 is in contact with the first side 35a of the second right element 35.

[0130] 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 such 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 such that the base element 40c is located between the first straight element 34 and the third straight element 36.

[0131] A first lateral surface of the first branch 40a of the third U-shaped element 40 is in contact with the fourth side 36d of the third straight element 36.

[0132] The second end of the second branch 40b of the third U 40 forms a first terminal of said antenna so that for example a connection point 40d of the second end of the second branch 40b of the third U 40 is connected to the impedance matching circuit 18.

[0133] The first end of the fourth straight element 37 is connected to the second side 34b of the first straight element 34 such that the first side 37a of the fourth straight element 37 is perpendicular to the second side 34b of the first straight element 34 and such that the fourth straight element 37 is located between the second straight element 35 and the second U-shaped element 39.

[0134] The third lateral surface 37c of the fourth right element 37 is in contact with the second lateral surface 34b of the first right element 34.

[0135] The second end of the fourth right element 37 forms a second terminal of said antenna so that for example a connection point 37e of the fourth side 37d of the fourth right element 37 is connected to the impedance matching circuit 18.

[0136] A person skilled in the art is able to determine the arrangement and value of capacitors and inductors to design the impedance matching circuit 18 based on the example of the planar antenna 17 connected to the impedance matching circuit 18 and based on the frequency range in which the planar antenna emits electromagnetic waves comprising the measurements.

Claims

Claims

1. Device (8) for monitoring a railway bogie (3) comprising a printed circuit board (14), detection means (16) configured to measure at least one physical parameter of the railway bogie and a planar antenna (17) integrated in the printed circuit board, the planar antenna being configured to transmit measurements delivered by the detection means.

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

3. Device according to claim 1 or 2, the at least one physical parameter comprising a physical parameter of the temperature of the railway bogie and vibrations of the railway bogie.

4. Device according to any one of claims 1 to 3, the printed circuit board (14) supporting the detection means (16).

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

6. Device according to any one of claims 1 to 4, the planar antenna (17) comprising: - 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 so 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 so that the longest side of the second L-shaped element extends the second side of the first rectangular element, the end of the longest side of the second L-shaped element which is not connected to the fourth side of the first rectangular element forming a first terminal, and - a second rectangular element (28) comprising a first side (28a) extending the longest side of the second L-shaped element with a gap, a second side (28b) parallel to the first side facing the first L-shaped element,a third side (28c) connecting the first and second sides, the third side facing the second L-shaped element, and a fourth side (28d) parallel to the third side, the second rectangular element forming a second terminal of said antenna.,

7. Device according to any one of claims 1 to 4, the planar antenna (17) comprising: - 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 being parallel, the second straight element being arranged between the first and third straight elements, the fourth straight element connecting a first end of the first straight element and a first end of the third element

8. straight so that the first side of the fourth straight element is perpendicular to the first side of the first straight element, the fifth straight element connecting 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 - the second straight element forming a terminal of said antenna. Device according to any one of claims 1 to 4, the planar antenna (17) comprising: - 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), 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, the second end of the first leg of the first U-shaped element being connected to a first end of the first straight element and the second end of the first leg of the second U-shaped element being connected to the second end of the first straight element such that the base element of the first and second U-shaped elements is parallel to the first side of the first straight element, a first end of the second straight element being connected to the second side of the first straight element such 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 forming a first terminal of said antenna and being connected to a first end of the third straight element so that the first side

9.

10.

11. of the second straight element is perpendicular to the first side of the third straight element, the second end of the third straight element being connected to the second end of the first branch of the third U-shaped element, such that the base element of the third U-shaped element is parallel to the first side of the first straight element and such that the base element is located between the first straight element and the third straight element, the second end of the second branch of the third U-shaped element forming a second terminal of said antenna, the first end of the fourth straight member being connected to the second side of the first straight member such that the first side of the fourth straight member is perpendicular to the second side of the first straight member and such that the fourth straight member is between the second straight member and the second U-shaped member, and the second end of the fourth straight element forming a third terminal of said antenna. Device according to any one of claims 1 to 8, further comprising a battery (12) configured to power the planar antenna (17) and the detection means (16). Railway bogie (3) comprising a device (8) according to any one of claims 1 to 9. A railway bogie (3) according to claim 10, further comprising an axle box (4), the device being fixed to the axle box such that the device is located on an outer side of the railway bogie (3).

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