Fuel cell unit

Abstract

To provide a fuel cell unit in which a communication antenna can be installed without affecting transmission and reception of radio waves while increase in size due to installation of the communication antenna is suppressed.SOLUTION: A fuel cell unit 10 includes: a housing 20 that defines an internal space S accommodating a fuel cell module; a recording device 14 that records data related to the fuel cell module; and a communication antenna 15 that is signal-connected to the recording device 14 and transmits and receives data recorded in the recording device 14. In a top plate 23, an accommodation recess 26a is formed that is recessed from an outer surface 23b toward the internal space S and opens toward the outside of the housing 20. The communication antenna 15 is housed in the accommodation recess 26a and installed on an outer surface 23b side of the top plate 23.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a fuel cell unit. [Background technology]

[0002] For example, Patent Document 1 discloses a fuel cell system as an example of a fuel cell unit. The fuel cell system disclosed in Patent Document 1 includes a fuel cell stack formed by stacking multiple cell units, an end plate provided at one end of the fuel cell stack in the stacking direction, and an auxiliary structure provided at the other end opposite the one end of the fuel cell stack. The auxiliary structure has the function of supplying air and fuel to the fuel cell stack and discharging exhaust gas from the fuel cell stack. The fuel cell stack is held between the end plate and the auxiliary structure. Furthermore, a fuel cell unit generally has a communication antenna for transmitting and receiving data related to the fuel cell unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-92402 Summary of the Invention [Problem to be solved by the invention]

[0004] Regarding the installation of the communication antenna, it is desirable to install it in a position that does not affect the transmission and reception of radio waves while suppressing an increase in the size of the fuel cell unit. [Means for solving the problem]

[0005] The fuel cell unit for solving the above problems comprises a housing defining an internal space for accommodating a fuel cell module, a recording device for recording data relating to the fuel cell module, and a communication antenna that is signal-connected to the recording device and transmits and receives the data recorded in the recording device, wherein the housing has a bottom plate positioned below the fuel cell module and a housing main body that is positioned above the bottom plate and defines the internal space together with the bottom plate, and the housing main body has a storage recess that is recessed from the outer surface of the housing main body toward the internal space and opens toward the outside of the housing, and the communication antenna is housed in the storage recess and is installed on the outer surface side of the housing.

[0006] According to this, the accommodating recess is recessed from the outer surface of the housing body. The communication antenna is accommodated in the accommodating recess. For example, compared to when the communication antenna is installed on the outer surface of the housing body where the accommodating recess is not recessed, the size of the fuel cell unit can be suppressed from increasing. Furthermore, even if the communication antenna is accommodated in the accommodating recess, the accommodating recess is open to the outside of the housing. In other words, the communication antenna is not accommodated in a closed space. Therefore, there is no impact on the transmission and reception of radio waves due to accommodating the communication antenna in the accommodating recess.

[0007] In a fuel cell unit, the storage recess is defined by a bottom wall recessed from the outer surface of the housing body toward the internal space and a side wall erected from a portion of the edge of the bottom wall, and has a communication port connecting the storage recess to the internal space, and the recording device is housed in the internal space of the housing and is signal-connected to the communication antenna by wiring, and the wiring may extend from the storage recess to the internal space through the communication port.

[0008] With this, since the recording device is housed in the internal space of the housing, the size of the fuel cell unit can be made smaller than when the recording device is installed outside the housing. The accommodating recess and the internal space are connected by a communication port. Therefore, the recording device installed in the internal space and the communication antenna housed in the accommodating recess can be signal-connected by wiring. In other words, the recording device and the communication antenna can be signal-connected without having to route wiring outside the housing.

[0009] The fuel cell unit may be installed in a position where the communication antenna and the recording device do not overlap when the communication antenna is viewed from a direction perpendicular to the outer surface of the housing body.

[0010] According to this, for example, if the communication antenna and the recording device overlap when viewed from a direction perpendicular to the outer surface of the housing body, the wiring will be bent to connect the signals between the communication antenna and the recording device.In contrast, by installing the communication antenna in a position where the communication antenna and the recording device do not overlap when viewed from a direction perpendicular to the outer surface of the housing body, it is possible to eliminate bending of the wiring.

[0011] In the fuel cell unit, the accommodating recess may be formed in a top plate located opposite the bottom plate of the housing body, and the communication antenna may be accommodated in the accommodating recess recessed from the outer surface of the top plate.

[0012] This prevents the size of the fuel cell unit from increasing in the vertical direction, unlike when the communication antenna protrudes from the outer surface of the top plate. In the fuel cell unit, a radio wave transmitting / receiving area for transmitting and receiving radio waves by the communication antenna may be provided around the communication antenna on the outer surface of the top plate and above the communication antenna.

[0013] This ensures a radio wave transmission and reception area, thereby suppressing degradation in the transmission and reception of radio waves by the communication antenna. [Effects of the Invention]

[0014] The present invention makes it possible to install a communication antenna without affecting the transmission and reception of radio waves, while suppressing an increase in size that would otherwise be required when installing the communication antenna. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing a fuel cell unit. [Figure 2] FIG. 2 is a plan view showing the fuel cell unit. [Figure 3] FIG. 3 is a cross-sectional view showing the accommodating recess, the communication antenna, and the recording device. [Figure 4] FIG. 4 is a perspective view showing the receiving recess, the communication antenna, and the recording device. [Figure 5] FIG. 5 is a perspective view showing another example of a fuel cell unit. DETAILED DESCRIPTION OF THE INVENTION

[0016] An embodiment of a fuel cell unit will now be described with reference to FIGS. <Fuel cell unit> 1, the fuel cell unit 10 has a fuel cell module 11 and a housing 20 that houses the fuel cell module 11. The fuel cell unit 10 is connected to a hydrogen tank, an air filter, a radiator, and the like (not shown) that are installed outside the housing 20.

[0017] The fuel cell module 11 has a fuel cell stack 12, and also has an air compressor 18, a diluter (not shown), a hydrogen pump, a water pump, an inverter, etc., as equipment related to power generation by the fuel cell stack 12. The fuel cell unit 10 also has a measuring device 13, a recording device 14, and a communication antenna 15.

[0018] <Case> The housing 20 defines an internal space S that houses the fuel cell module 11. The housing 20 has a bottom plate 21 disposed below the fuel cell stack 12, and a housing main body 22 disposed above the bottom plate 21. The housing main body 22 defines the internal space S together with the bottom plate 21. The housing 20 also has a frame 31 that stands upright from an upper surface 21a of the bottom plate 21.

[0019] The bottom plate 21 is a rectangular plate. The direction in which a pair of long edges of the bottom plate 21 extend is defined as a first direction X, and the direction in which a pair of short edges of the bottom plate 21 extend is defined as a second direction Y. The first direction X is a direction along the upper surface 21a of the bottom plate 21, and the second direction Y is a direction along the upper surface 21a of the bottom plate 21 and perpendicular to the first direction X.

[0020] The frame 31 has legs 32 erected from the four corners of the upper surface 21a of the bottom plate 21, and erecting members 33 erected on each of the legs 32 adjacent to each other in the first direction X and the legs 32 adjacent to each other in the second direction Y.

[0021] The housing main body 22 has a top plate 23 facing the bottom plate 21, and a pair of first side plates 24 and a pair of second side plates 25 located between the top plate 23 and the bottom plate 21. The top plate 23 is located opposite the bottom plate 21 on the housing main body 22. The pair of first side plates 24 face each other in the first direction X, and the pair of second side plates 25 face each other in the second direction Y.

[0022] The top plate 23 is a rectangular plate. The longitudinal direction of the top plate 23 coincides with the longitudinal direction of the bottom plate 21, and the lateral direction of the top plate 23 coincides with the lateral direction of the bottom plate 21. Therefore, the longitudinal direction of the top plate 23 coincides with the first direction X, and the lateral direction of the top plate 23 coincides with the second direction Y. For this reason, the longitudinal direction of the top plate 23 will be referred to as the first direction X, and the lateral direction of the top plate 23 will be referred to as the second direction Y. The top plate 23 is supported on the upper surface of the frame 31. The thickness direction of the top plate 23 coincides with the up-down direction.

[0023] 3, the top plate 23 has an inner surface 23a and an outer surface 23b which are opposite surfaces in the up-down direction. The inner surface 23a faces the internal space S, and the outer surface 23b faces outside the internal space S. The top plate 23 has an antenna housing section 26. An housing recess 26a is defined inside the antenna housing section 26. The antenna housing section 26 and the housing recess 26a will be described later.

[0024] 1 and 2, one of the pair of first side plates 24 is fastened to one end surface of the frame 31 in the first direction X, and the other of the pair of first side plates 24 is fastened to the other end surface of the frame 31 in the first direction X. One of the pair of second side plates 25 is fastened to one end surface of the frame 31 in the second direction Y, and the other of the pair of second side plates 25 is fastened to the other end surface of the frame 31 in the second direction Y.

[0025] The space between the bottom plate 21 and the top plate 23 is closed by a pair of first side plates 24 and a pair of second side plates 25. An internal space S is defined by the bottom plate 21, the top plate 23, the pair of first side plates 24, and the pair of second side plates 25.

[0026] <Measuring and recording devices> The measuring device 13 measures physical quantities in the internal space S. Examples of the physical quantities include the temperature and hydrogen concentration in the internal space S. The measuring device 13 is installed on the inner surface 23a of the top plate 23 and is thereby exposed to the internal space S. Data relating to the physical quantities measured by the measuring device 13 is recorded in the recording device 14. Although not shown, the measuring device 13 and the recording device 14 are signal-connected by wiring.

[0027] The recording device 14 records data related to the fuel cell module 11. The data related to the fuel cell module 11 is data of physical quantities measured by the measuring device 13. The recording device 14 is installed on the frame 31. More specifically, the recording device 14 is installed in a portion of the frame 31 near the position where one of the first side plates 24 and one of the second side plates 25 intersect, close to the one of the second side plates 25. The recording device 14 may also be installed on the second side plate 25 instead of the frame 31.

[0028] <Communication antenna> The communication antenna 15 transmits and receives data recorded in the recording device 14. The communication antenna 15 is installed on the outer surface 23b side of the top panel 23, which is the outer surface side of the housing main body 22. The communication antenna 15 is wirelessly connected to a server provided outside the housing 20 via signals.

[0029] 4, the communication antenna 15 is housed in the antenna housing portion 26. The communication antenna 15 is attached to a plate-shaped mounting base 15a. The mounting base 15a is attached to a part of the top plate 23 in which the antenna housing portion 26 is formed, so that the communication antenna 15 is installed on the outer surface side of the top plate 23.

[0030] The communication antenna 15 is signal-connected to the recording device 14 via wiring 17. The communication antenna 15 has a connection board 15b in which a connection port for the wiring 17 is formed. The recording device 14 has a connection board 14a in which a connection port for the wiring 17 is formed. The wiring 17 extends between the connection board 14a of the recording device 14 and the connection board 15b of the communication antenna 15.

[0031] <Antenna housing section and housing recess> 2, the antenna housing section 26 is formed by processing the metal plate that forms the top plate 23. The antenna housing section 26 is provided closer to one of the first side plates 24 in the first direction X and closer to one of the second side plates 25 in the second direction Y. The antenna housing section 26 is provided in a position aligned with the recording device 14 in the second direction Y, and is also provided in a position close to the recording device 14 in the second direction Y.

[0032] 3 and 4, antenna housing section 26 is formed by a bottom wall 27 recessed from outer surface 23b of top panel 23 toward internal space S, and a side wall 28 erected from part of the edge of bottom wall 27. An accommodation recess 26a is defined inside antenna housing section 26.

[0033] The accommodating recess 26a is defined by a bottom wall 27 recessed from the outer surface 23b of the top plate 23 toward the internal space S, and a side wall 28 erected from a part of the edge of the bottom wall 27. Therefore, the accommodating recess 26a is recessed from the outer surface 23b of the top plate 23 toward the internal space S, and is open toward the outside of the housing 20. In other words, the accommodating recess 26a is not blocked from above by other components that form the fuel cell unit 10.

[0034] Furthermore, the storage recess 26a has a communication opening 26c that is not connected to the edges of the top plate 23 and the bottom wall 27 and that opens into the internal space S. The communication opening 26c is formed by not forming a side wall 28 on one of the four edges of the bottom wall 27. The communication opening 26c opens toward one of the pair of second side plates 25 that is closer to the recording device 14. Therefore, the storage recess 26a opens toward the one of the second side plates 25 that is closer to the recording device 14. The storage recess 26a and the internal space S are in communication with each other via the communication opening 26c.

[0035] The accommodating recess 26a accommodates the mounting base 15a and the communication antenna 15. That is, the communication antenna 15 and the mounting base 15a are accommodated in the accommodating recess 26a recessed from the outer surface 23b of the top plate 23.

[0036] The shortest distance in the vertical direction from the outer surface 23b of the top plate 23 to the bottom surface 27a of the bottom wall 27 is defined as the depth F of the storage recess 26a. The depth F is greater than the sum of the thicknesses of the communication antenna 15 and the mounting base 15a in the vertical direction. Therefore, the entire communication antenna 15 and mounting base 15a are contained within the storage recess 26a. In other words, the communication antenna 15 does not protrude above the outer surface 23b of the top plate 23.

[0037] The recording device 14 is installed below the bottom wall 27. The connection board 14a of the recording device 14 is located below the bottom wall 27 and therefore below the communication opening 26c. The communication antenna 15 is housed in the accommodating recess 26a with the connection board 15b facing the communication opening 26c. The wiring 17 extends from the accommodating recess 26a toward the communication opening 26c and from the accommodating recess 26a into the internal space S through the communication opening 26c. The wiring 17 extending from the accommodating recess 26a into the internal space S extends below the bottom wall 27 and is then connected to the connection board 14a of the recording device 14. The wiring 17 has a portion that extends obliquely downward from the communication antenna 15 toward the recording device 14. Therefore, the wiring 17 is slightly bent toward the recording device 14 after passing through the communication opening 26c.

[0038] 2, when the communication antenna 15 is viewed from a direction perpendicular to the outer surface 23b of the top panel 23, the communication antenna 15 and the recording device 14 are installed in positions where they do not overlap each other. Therefore, the recording device 14 and the communication antenna 15 do not overlap in the vertical direction. In other words, the recording device 14 and the communication antenna 15 are arranged at positions separated from each other in the second direction Y.

[0039] Furthermore, when the communication antenna 15 is viewed from a direction perpendicular to the outer surface 23b of the top plate 23, the communication opening 26c is located between the accommodation recess 26a and the internal space S. When the communication antenna 15 is viewed from a direction perpendicular to the outer surface 23b of the top plate 23, the wiring 17 extends substantially straight in the second direction Y between the connection board 15b of the communication antenna 15 and the connection board 14a of the recording device 14.

[0040] A radio wave transmitting / receiving area R is provided on the outer surface 23b of the top plate 23 at a position surrounding the accommodation recess 26a. The radio wave transmitting / receiving area R is an area extending from the edge of the opening of the accommodation recess 26a to a position a certain distance away. When the top plate 23 is viewed from the outer surface 23b, the radio wave transmitting / receiving area R has a rectangular frame shape. By providing the radio wave transmitting / receiving area R, no metal parts or antennas are installed above or around the communication antenna 15.

[0041] [Operation of the embodiment] Next, the operation of the embodiment will be described. The communication antenna 15 is housed in a housing recess 26a recessed from the outer surface 23b of the top panel 23, and is installed on the outer surface 23b side of the top panel 23. The housing recess 26a opens upward, so that the communication antenna 15 can transmit and receive radio waves without being obstructed by obstructions.

[0042] [Effects of the embodiment] According to the above embodiment, the following effects can be obtained. (1) The top plate 23 of the housing 20 has an accommodating recess 26a recessed from the outer surface 23b of the top plate 23. The communication antenna 15 is accommodated in the accommodating recess 26a and is installed on the outer surface 23b side of the top plate 23. For example, compared to when the communication antenna 15 is installed on the outer surface 23b side of the top plate 23 where the accommodating recess 26a is not recessed, the size of the fuel cell unit 10 can be kept small. Furthermore, even when the communication antenna 15 is accommodated in the accommodating recess 26a, the accommodating recess 26a is open to the outside of the housing 20. In other words, the communication antenna 15 is not accommodated in a closed space. Therefore, accommodating the communication antenna 15 in the accommodating recess 26a does not affect the transmission and reception of radio waves.

[0043] (2) Because the recording device 14 is accommodated in the internal space S of the housing 20, the size of the fuel cell unit 10 can be made smaller than when the recording device 14 is installed outside the housing 20. The accommodating recess 26a and the internal space S are connected by the communication opening 26c. This allows a signal connection between the recording device 14 installed in the internal space S and the communication antenna 15 accommodated in the accommodating recess 26a via the wiring 17. In other words, the recording device 14 and the communication antenna 15 can be signal-connected via the wiring 17 without having to route the wiring 17 outside the housing 20.

[0044] (3) The accommodating recess 26a is recessed from the outer surface 23b of the top plate 23. The entire communication antenna 15 is accommodated in the accommodating recess 26a. Therefore, even if the communication antenna 15 is installed on the top plate 23, the size of the fuel cell unit 10 does not increase in the vertical direction.

[0045] (4) The communication antenna 15 is installed on the top panel 23 of the housing body 22. In other words, the communication antenna 15 is installed above the fuel cell unit 10. This allows the communication antenna 15 to efficiently transmit and receive radio waves.

[0046] (5) In the top panel 23, a radio wave transmission / reception area R is secured around the accommodating recess 26a. No other components are installed in the radio wave transmission / reception area R. Therefore, by securing the radio wave transmission / reception area R, it is possible to suppress a decrease in the transmission and reception of radio waves by the communication antenna 15.

[0047] (6) The recording device 14 is installed on the frame 31 close to the housing recess 26a, and the connection board 14a is installed on the frame 31 facing the communication opening 26c. Therefore, the wiring 17 that passes through the communication opening 26c can be connected to the recording device 14 without bending significantly. Therefore, the stress generated by bending deformation of the wiring 17 can be kept small.

[0048] (7) The communication opening 26c of the accommodation recess 26a is interposed between the communication antenna 15 and the recording device 14. The wiring 17 that connects the communication antenna 15 and the recording device 14 to each other by signals passes through the communication opening 26c, and extends straight from the communication antenna 15 toward the recording device 14 when the communication antenna 15 is viewed from a direction perpendicular to the outer surface 23b of the top plate 23. This allows the length of the wiring 17 to be shortened and prevents the wiring 17 from bending.

[0049] (8) When the communication antenna 15 is viewed from a direction perpendicular to the outer surface 23b of the top panel 23, the communication antenna 15 and the recording device 14 are installed in positions where they do not overlap. In other words, when the communication antenna 15 is viewed from a direction perpendicular to the outer surface 23b of the top panel 23, the communication antenna 15 and the recording device 14 are disposed at positions separated in the second direction Y. For example, when the communication antenna 15 is viewed from a direction perpendicular to the outer surface 23b of the top panel 23, it is possible to prevent the wiring 17 from bending, as occurs when the communication antenna 15 and the recording device 14 overlap. Furthermore, the length of the wiring 17 can be shortened.

[0050] [Example of change] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0051] The communication antenna 15 and the recording device 14 may be installed in positions where they overlap when viewed from a direction perpendicular to the outer surface 23b of the top panel 23. Specifically, the recording device 14 may be installed below the bottom wall 27.

[0052] Metal parts or other antennas may be installed in the radio wave transmission / reception area R as long as the influence on the transmission and reception of radio waves by the communication antenna 15 is small. 5, the antenna accommodating section 26 may be provided in the second side plate 25. The accommodating recess 26a is recessed from the outer surface of the second side plate 25 toward the internal space S. Although not shown, the antenna accommodating section 26 and the accommodating recess 26a may also be provided in the first side plate 24.

[0053] The communication antenna 15 and the recording device 14 may be connected wirelessly. In this case, the wiring 17 is eliminated, and therefore the communication opening 26c does not need to be formed in the antenna housing 26.

[0054] Although the communication opening 26c is open toward the recording device 14, this is not limiting. The communication opening 26c may not open toward the recording device 14, but may open toward the opposite side of the recording device 14 in the second direction Y, or may open toward the first side plate 24. Even in this configuration, the communication antenna 15 and the recording device 14 are signal-connected by the wiring 17 that extends between the accommodating recess 26a and the internal space S through the communication opening 26c.

[0055] The antenna housing section 26 may be provided by joining a separate part to the top plate 23. For example, the box-shaped antenna housing section 26 is integrated with the inner surface 23a of the top plate 23 by welding, bolting, or the like. In this case, an opening is formed in the top plate 23 so as to face the antenna housing section 26 so as to open toward the outside of the top plate 23.

[0056] The side walls 28 forming the antenna housing portion 26 may be erected from all four edges of the bottom wall 27. In this case, through holes for passing the wiring 17 are formed in the side walls 28. The communication antenna 15 may be fixed to the side wall 28 that forms the antenna housing portion 26, rather than to the bottom wall 27, and thereby housed in the housing recess 26a.

[0057] The antenna housing portion 26 may have a rectangular cylindrical shape extending from the outer surface 23b of the top panel 23. In this case, the antenna housing portion 26 does not have a bottom wall 27, and therefore the communication antenna 15 is fixed to the side wall 28.

[0058] The recording device 14 does not have to be housed in the internal space S of the housing 20. In this case, the recording device 14 may be installed on the outer surface of the housing 20, for example, on the outer surface 23b of the top panel 23 or the outer surface of the second side panel 25.

[0059] The installation position of the recording device 14 may be changed depending on the arrangement of the components of the fuel cell module 11 inside the housing 20. In this case, the installation position of the communication antenna 15 is changed depending on the change in the installation position of the recording device 14. Then, the positions of the antenna accommodating portion 26 and the accommodating recess 26a are changed depending on the change in the installation position of the communication antenna 15.

[0060] The communication antenna 15 accommodated in the accommodation recess 26a may have a portion thereof protruding from the outer surface 23b of the top plate 23. Even in this case, the size of the fuel cell unit 10 can be prevented from increasing compared to when the entire communication antenna 15 is installed on the outer surface 23b of the top plate 23 where the accommodation recess 26a is not formed.

[0061] The housing 20 may not have the frame 31 and may be composed of the bottom plate 21 and the housing body 22 . The data recorded in the recording device 14 may be other than the data measured by the measuring device 13, and may be, for example, the amount of power generated by the fuel cell module 11, the power generation time of the fuel cell module 11, the operating time of the air compressor, the operating time of the water pump, the operating time of the hydrogen pump, etc. [Explanation of symbols]

[0062] R...radio wave transmitting / receiving area, S...internal space, 10...fuel cell unit, 11...fuel cell module, 14...recording device, 15...communication antenna, 17...wiring, 20...casing, 21...bottom plate, 22...casing body, 23...top plate, 23b...external surface, 26a...accommodation recess, 26c...communication port, 27...bottom wall, 28...side wall.

Claims

1. a housing defining an interior space for housing a fuel cell module; a recording device for recording data relating to the fuel cell module; a communication antenna that is signal-connected to the recording device and transmits and receives the data recorded in the recording device, The housing includes a bottom plate disposed below the fuel cell module; a housing body disposed above the bottom plate and defining the internal space together with the bottom plate, The housing main body has an accommodating recess formed therein, the accommodating recess being recessed from an outer surface of the housing main body toward the internal space and opening toward the outside of the housing; The fuel cell unit is characterized in that the communication antenna is housed in the housing recess and is installed on the outer surface side of the housing.

2. the accommodating recess is defined by a bottom wall recessed from the outer surface of the housing body toward the internal space and a side wall erected from a part of an edge of the bottom wall, and has a communication port that connects the accommodating recess to the internal space, the recording device is accommodated in the internal space of the housing and is signal-connected to the communication antenna by a wire; 2. The fuel cell unit according to claim 1, wherein the wiring extends from the accommodating recess into the internal space through the communication opening.

3. 3. The fuel cell unit according to claim 2, wherein the communication antenna and the recording device are installed at positions where they do not overlap when the communication antenna is viewed from a direction perpendicular to the outer surface of the housing body.

4. A fuel cell unit as described in any one of claims 1 to 3, wherein the accommodating recess is formed in a top plate located opposite the bottom plate of the housing main body, and the communication antenna is accommodated in the accommodating recess recessed from the outer surface of the top plate.

5. 5. The fuel cell unit according to claim 4, wherein a radio wave transmitting / receiving area for transmitting and receiving radio waves by the communication antenna is secured around the communication antenna on the outer surface of the top plate and above the communication antenna.

Images