A lighting module

Abstract

The invention relates to a lighting module (100), comprising: a housing (101);a radio module (103) inside the housing (101), wherein the radio module (103) comprises a first antenna (104) extending along a first direction (di); and a slot antenna (102) inside the housing (101) extending along a second direction (d2), wherein the slot antenna (102) is electromagnetically coupled to the first antenna (104), and wherein an angle (a) between the first direction (di) and the second direction (d2) is adjustable.

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to a lighting module comprising a radio module.BACKGROUND OF THE INVENTION

[0002] Many lighting modules or luminaires comprise radio modules and LED drivers whose mounting positions are fixed after the production of the lighting module or luminaire. However, this often means that a radiation performance of the radio module is fixed and cannot be optimized in the actual application of the lighting module or luminaire.

[0003] For instance, in metal luminaires, it is known to position a radio module in a metal housing which comprises an opening such that a signal of the radio module can exit from the housing. It is further known to use slot antennas in the housing to facilitate the signal to exit the housing. The slot antennas are excited by the radio module and act as an antenna to the outside.

[0004] However, these slot antennas are arranged rigidly in the housing and, due to different arrangements of antennas of different types, there may be fluctuations in how well the radio signal primarily generated by the radio module can be decoupled. The relative orientation of the radio module to the slit is a crucial parameter which cannot be changed to optimize performance in most known luminaires.

[0005] Technologies relevant in this field include US 2016 / 0 69 551 A1 and CN 108 966 443 A.

[0006] US 2016 / 0 69 551 A1 discloses a luminaire that includes: a power circuit that supplies power to a light source; an antenna that at least one of transmits and receives a wireless signal; and a metal housing that contains the antenna and the power circuit, wherein the metal housing has an opening, and the antenna and the opening are arranged to cause a polarization plane of an electric wave most strongly radiated from the antenna and a polarization plane of an electric wave most strongly radiated from the opening to substantially coincide with each other.

[0007] CN 108 966 443 A discloses a lighting control device and a lighting device. The lighting control device is accommodated in a metal housing, and comprises: an upper wall surface of the metal housing provided with a first slit extending in a first direction and a second slit extending in a direction different from the first direction; an antenna which is accommodated in the housing and configured to be able to rotate; and a controller which controls the movement state of a light source according to an external signal received by the antenna. The antenna can rotate to a first position opposite the first slit and a second position opposite the second slit.

[0008] Thus, it is an objective to provide for an improved lighting module which avoids the above disadvantages. In particular, it is an objective to optimize the radiation performance of a radio module in a lighting module.SUMMARY OF THE INVENTION

[0009] The object of the present invention is achieved by the solution provided in the enclosed independent claim. Advantageous implementations of the present invention are further defined in the dependent claims.

[0010] According to a first aspect of the invention, a lighting module is provided. The lighting module comprises a housing, a radio module inside the housing, wherein the radio module comprises a first antenna extending along a first direction and a slot antenna inside the housing extending along a second direction, wherein the slot antenna is electromagnetically coupled to the first antenna, and wherein an angle between the first direction and the second direction is adjustable.

[0011] According to a first alternative, the first antenna is in a fixed position with respect to the housing, and the housing further comprises a rotational element and the slot antenna is arranged on the rotational element. Thus, the angle can be adjusted by changing the orientation of the slot antenna relative to the radio module.

[0012] This provides the advantage that the performance of the radiation emitted by the radio module can be optimized with respect to the outside according to the specific application by changing the relative orientation of the first antenna with respect to the slot antenna. This further provides the advantage that the position of the slot antenna relative to the first antenna or radio module can easily be changed or adjusted even in case that the relative position of the entire module to the housing cannot be changed. This is particularly advantageous for cases where a fixing structure of the housing and the radio module allow only one specific position.

[0013] In a preferred embodiment of the first alternative, the rotational element is a disk. Such a disk that is arranged in a wall of the housing can easily be rotated so that any relative orientation between the first antenna the second antenna can be achieved.

[0014] According to a second alternative, the first antenna is configured to be rotated with respect to the slot antenna arranged fixedly in the housing.

[0015] This provides the advantage that the position of the first antenna relative to the slot antenna can easily be adjusted e.g. by changing the orientation of the first antenna with respect to the housing and keeping the slot antenna in a fixed position with respect to the housing. This is specifically advantageous because the structure of the housing becomes simpler because movable components can be avoided. The number of parts regarding the housing is reduced and thus manufacturing costs may also be reduced. In this case, the radio module is configured to allow a rotation of the first antenna with respect to the orientation of the second antenna. This can be achieved by positioning the entire module such that the desired orientation between the first antenna and the second antenna is achieved and then affixing the radio module to the housing in this position.

[0016] Furthermore, the housing further comprises a plurality of positioning elements cooperating with one or more corresponding elements of the radio module such that the radio module can be positioned in a plurality of orientations relative to the slot antenna.

[0017] This provides the advantage that the position of the radio module relative to the slot antenna can easily be changed and, therefore, the performance of the radiation emitted by the radio module relative to the outside world can be optimized according to the application case. Using such a predefined position additionally has the advantage that an unintended change of the relative orientation between the first antenna the second antenna can be avoided.

[0018] In a preferred embodiment of either alternative, the housing is a metal housing. Having a metal housing has the advantage that the characteristics of the emitted radiation are precisely defined by the second antenna in cooperation with the first antenna. The metal housing functions as a shield for undesired emission of radio signals by the first antenna.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention will be explained in the followings together with the figures. Fig. 1shows an embodiment of a lighting module; Fig. 2shows an embodiment of a lighting module according to the first alternative; and Fig. 3shows an embodiment of a lighting module according to the second alternative. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] For describing the present invention in greater detail, the expression 'LED luminaire' shall mean a luminaire with a light source comprising one or more LEDs or OLEDs. LEDs are well-known in the art, and therefore, will only briefly be discussed to provide a complete description of the invention.

[0021] Now referring to Fig. 1, a lighting module 100 according to the invention is shown according to a basic embodiment.

[0022] The lighting module 100 comprises a metal housing 101, a radio module 103 inside the housing 101, wherein the radio module 103 comprises a first antenna 104 extending along a first direction d1. Moreover, the housing 101 comprises a slot antenna 102 defined by a recess in one of the walls of the housing 101, extending along a second direction d2, wherein the slot antenna 102 is electromagnetically coupled to the first antenna 104, and wherein an angle α is defined the first direction d1 and the second direction d2. The lighting module 100 is configured such that this angle can be adjusted by changing the directions d1 and d2 relative to each other.

[0023] This provides the advantage that the slot antenna 102 or its position or at least its orientation d2 relative to the first antenna 104 of the radio module 103 is adjustable to ensure an optimized emission of radio signals without the need of providing an antenna projecting from the outer surface of the metal housing.

[0024] The lighting module 100 can be a luminaire, in particular an LED luminaire. The lighting module 100 can comprise a plurality of LEDs and an LED driver for providing electrical energy to the LEDs. The LED driver can be arranged in the housing 101. It is to be noted that the radio module 103 may be integrated in the LED driver.

[0025] The slot antenna 102 can be a dipole antenna, in particular a λ / 2 dipole antenna.

[0026] The radio module 103, schematically represented by an ellipse in the figures, can be an RF module which is configured to transmit and / or receive RF (radio frequency) signals. For example, the RF signals can be control signals or status signals.

[0027] As indicated above, the housing 101 can be a metal housing, which prevents radio emission of the first antenna 104 to be radiated at other positions and towards other directions apart from the second antenna 102. Thus, the overall emission characteristics can be designed by adjusting the size of the second antenna 102 together with the orientation of the first antenna 104 and the second antenna 102 relative to each other.

[0028] It is to be noted that in the top view of the sidewall of the housing 101 in the figures, the radio module 103 and the second antenna 102 are shown to be arranged in a non-overlapping manner only in order to facilitate the understanding of the drawing. However, the position of the radio module 103 is usually chosen such that the first antenna 104 and the second antenna 102 to overlap at least partially.

[0029] Fig. 2 shows an embodiment of the lighting module 100 according to a first alternative present in the independent claim.

[0030] In this embodiment, a rotational element 201 is provided in the housing 101, in which element the actual slot antenna 102 is arranged. Usually, the element, in which the rotational element 201 is provided, is a sidewall of the metallic housing 101. By rotating the rotational element 201, the orientation d1 of the slot antenna 102 (second antenna) is adjusted relative to the housing 101 and, ultimately, to the radio module 103 fixedly arranged in the housing 101 by means of the fixing elements 103a and 103b. In this embodiment, the position and the orientation of the first antenna 104 relative to the entire radio module 103 are fixed. Thus, the relative orientation between the first direction and the second direction is adjusted by rotating the rotation element 201. In the advantageous embodiment shown in figure 2, the rotational element 201 has a disc shape with a circular circumference. However, different shapes of the circumference may be thought of as long as they allow different rotational positions. This could for example be achieved by using a regular hexagon. Of course, the recess in the sidewall of the housing 101 must have a corresponding shape so that the rotational element 201 can be inserted at different rotational positions.

[0031] As shown in the drawing, the rotational element 201 is a disk rotatably mounted in the sidewall of the housing. Such a disc can be formed with an outer edge that secures the disk-shaped rotational element 201 to an annular recess in the sidewall of the housing 101 such that the rotation element 201 may be rotated but is permanently arranged in the recess. Contrary, in case of for example the regular hexagon mentioned above, the rotational element 201 must be detached, rotated and attached again in order to change its orientation.

[0032] The slot antenna 102 is arranged in the disk. In order to ensure that the orientation of the rotational element 201 is not changed unintentionally, it is preferred that friction between the rotational element 201 and the sidewall in which the rotational element 201 is arranged large enough so that a change of the orientation of the rotational element 201 can only be achieved by using a tool such as a screwdriver.

[0033] Fig. 3 shows a further embodiment of the lighting module 100 according to a second alternative present in the independent claim.

[0034] In this embodiment, the slot antenna 102 in the housing 101 cannot be adjusted with respect to its orientation. The slot antenna 102 is established by a recess that is arranged in a sidewall of the housing 101. In order to be able to set the relative orientation of the two elements (slot antenna 102 and first antenna 104 of the radio module 103), the radio module 103 or at least its antenna 104 can variably be mounted in the housing 104. For this purpose, several positioning elements 301 (e.g. positioning holes or pins) are arranged in the area of the slot antenna 102, so that the first antenna 104 of the radio module 103 can be rotated in this area by positioning the entire radio module 103 such that the desired orientation of the first direction and the second direction relative to each other is achieved. On the radio module 103 there are provided corresponding elements that interact with the positioning elements 301. For example, in case that positioning holes are formed in the sidewall of the housing 101 as positioning elements 301, the radio module 103 is provided with projections that can protrude into the holes of the housing 101. By rotating the entire radio module 103 and then inserting its projections into the respective positioning holes, the desired orientation of the radio module 103 relative to the slot antenna 102 can be set. Having achieved this desired relative orientation, the radio module 103 is then fixed to the housing 101, preferably using conventional fixing technology like, for example, screws clamping a flange of the radio module 103 to the housing 101. Alternatively, in case that the positioning elements 301 are realized as pins that project from an inner side of the sidewall of the housing 101, the radio module 103 provides recesses into which the positioning elements 301 of the housing 101 can be inserted.

[0035] Further, it is also possible that the radio unit 103 provides projections that can interact with the spaces between such projections as positioning elements 301 in order to avoid undesired rotation of the radio module 103. Again, once the desired orientation of the first antenna 104 and the second antenna 102 is adjusted, the radio module 103 is fixed to the housing 101 such that the radio module 103 is securely attached to the side wall of the housing 101 by means of screws, for example. It must be ensured that the overall design of the luminaire or rather the lighting module 100 allows the radio module 103 to be rotated in order to freely adjust the orientation of the first antenna 104 and the second antenna 102 relative to each other. Thus, there should be enough space in the housing 101 of the lighting module 101 in order to rotate the radio module 103.

[0036] In particular, in the embodiment shown in Fig. 3, the positioning elements 301 are arranged along a circle around a portion of the slit antenna 102. This allows to arrange the radio module 103 at different angles relative to the slot antenna 102 by means of the fixing element indicated as 103c in the drawing and representing the corresponding structure of the radio module 103 interacting with the positioning elements 301.

[0037] While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only and not limitation.

[0038] Thus, the breadth and scope of the present invention should not be limited by any of the above-described embodiments.

[0039] While a particular feature of the invention may have been disclosed with respect to only of the several implementations, such features may be combined with one or more other features of the other implementations as may be desired and advantage for any given or particular application.

Examples

Embodiment Construction

[0020]For describing the present invention in greater detail, the expression 'LED luminaire' shall mean a luminaire with a light source comprising one or more LEDs or OLEDs. LEDs are well-known in the art, and therefore, will only briefly be discussed to provide a complete description of the invention.

[0021]Now referring to Fig. 1, a lighting module 100 according to the invention is shown according to a basic embodiment.

[0022]The lighting module 100 comprises a metal housing 101, a radio module 103 inside the housing 101, wherein the radio module 103 comprises a first antenna 104 extending along a first direction d1. Moreover, the housing 101 comprises a slot antenna 102 defined by a recess in one of the walls of the housing 101, extending along a second direction d2, wherein the slot antenna 102 is electromagnetically coupled to the first antenna 104, and wherein an angle α is defined the first direction d1 and the second direction d2. The lighting module 100 is configured such tha...

TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to a lighting module comprising a radio module.BACKGROUND OF THE INVENTION

[0002] Many lighting modules or luminaires comprise radio modules and LED drivers whose mounting positions are fixed after the production of the lighting module or luminaire. However, this often means that a radiation performance of the radio module is fixed and cannot be optimized in the actual application of the lighting module or luminaire.

[0003] For instance, in metal luminaires, it is known to position a radio module in a metal housing which comprises an opening such that a signal of the radio module can exit from the housing. It is further known to use slot antennas in the housing to facilitate the signal to exit the housing. The slot antennas are excited by the radio module and act as an antenna to the outside.

[0004] However, these slot antennas are arranged rigidly in the housing and, due to different arrangements of antennas of different types, there may be fluctuations in how well the radio signal primarily generated by the radio module can be decoupled. The relative orientation of the radio module to the slit is a crucial parameter which cannot be changed to optimize performance in most known luminaires.

[0005] Technologies relevant in this field include US 2016 / 0 69 551 A1 and CN 108 966 443 A.

[0006] US 2016 / 0 69 551 A1 discloses a luminaire that includes: a power circuit that supplies power to a light source; an antenna that at least one of transmits and receives a wireless signal; and a metal housing that contains the antenna and the power circuit, wherein the metal housing has an opening, and the antenna and the opening are arranged to cause a polarization plane of an electric wave most strongly radiated from the antenna and a polarization plane of an electric wave most strongly radiated from the opening to substantially coincide with each other.

[0007] CN 108 966 443 A discloses a lighting control device and a lighting device. The lighting control device is accommodated in a metal housing, and comprises: an upper wall surface of the metal housing provided with a first slit extending in a first direction and a second slit extending in a direction different from the first direction; an antenna which is accommodated in the housing and configured to be able to rotate; and a controller which controls the movement state of a light source according to an external signal received by the antenna. The antenna can rotate to a first position opposite the first slit and a second position opposite the second slit.

[0008] Thus, it is an objective to provide for an improved lighting module which avoids the above disadvantages. In particular, it is an objective to optimize the radiation performance of a radio module in a lighting module.SUMMARY OF THE INVENTION

[0009] The object of the present invention is achieved by the solution provided in the enclosed independent claim. Advantageous implementations of the present invention are further defined in the dependent claims.

[0010] According to a first aspect of the invention, a lighting module is provided. The lighting module comprises a housing, a radio module inside the housing, wherein the radio module comprises a first antenna extending along a first direction and a slot antenna inside the housing extending along a second direction, wherein the slot antenna is electromagnetically coupled to the first antenna, and wherein an angle between the first direction and the second direction is adjustable.

[0011] According to a first alternative, the first antenna is in a fixed position with respect to the housing, and the housing further comprises a rotational element and the slot antenna is arranged on the rotational element. Thus, the angle can be adjusted by changing the orientation of the slot antenna relative to the radio module.

[0012] This provides the advantage that the performance of the radiation emitted by the radio module can be optimized with respect to the outside according to the specific application by changing the relative orientation of the first antenna with respect to the slot antenna. This further provides the advantage that the position of the slot antenna relative to the first antenna or radio module can easily be changed or adjusted even in case that the relative position of the entire module to the housing cannot be changed. This is particularly advantageous for cases where a fixing structure of the housing and the radio module allow only one specific position.

[0013] In a preferred embodiment of the first alternative, the rotational element is a disk. Such a disk that is arranged in a wall of the housing can easily be rotated so that any relative orientation between the first antenna the second antenna can be achieved.

[0014] According to a second alternative, the first antenna is configured to be rotated with respect to the slot antenna arranged fixedly in the housing.

[0015] This provides the advantage that the position of the first antenna relative to the slot antenna can easily be adjusted e.g. by changing the orientation of the first antenna with respect to the housing and keeping the slot antenna in a fixed position with respect to the housing. This is specifically advantageous because the structure of the housing becomes simpler because movable components can be avoided. The number of parts regarding the housing is reduced and thus manufacturing costs may also be reduced. In this case, the radio module is configured to allow a rotation of the first antenna with respect to the orientation of the second antenna. This can be achieved by positioning the entire module such that the desired orientation between the first antenna and the second antenna is achieved and then affixing the radio module to the housing in this position.

[0016] Furthermore, the housing further comprises a plurality of positioning elements cooperating with one or more corresponding elements of the radio module such that the radio module can be positioned in a plurality of orientations relative to the slot antenna.

[0017] This provides the advantage that the position of the radio module relative to the slot antenna can easily be changed and, therefore, the performance of the radiation emitted by the radio module relative to the outside world can be optimized according to the application case. Using such a predefined position additionally has the advantage that an unintended change of the relative orientation between the first antenna the second antenna can be avoided.

[0018] In a preferred embodiment of either alternative, the housing is a metal housing. Having a metal housing has the advantage that the characteristics of the emitted radiation are precisely defined by the second antenna in cooperation with the first antenna. The metal housing functions as a shield for undesired emission of radio signals by the first antenna.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention will be explained in the followings together with the figures. Fig. 1shows an embodiment of a lighting module; Fig. 2shows an embodiment of a lighting module according to the first alternative; and Fig. 3shows an embodiment of a lighting module according to the second alternative. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] For describing the present invention in greater detail, the expression 'LED luminaire' shall mean a luminaire with a light source comprising one or more LEDs or OLEDs. LEDs are well-known in the art, and therefore, will only briefly be discussed to provide a complete description of the invention.

[0021] Now referring to Fig. 1, a lighting module 100 according to the invention is shown according to a basic embodiment.

[0022] The lighting module 100 comprises a metal housing 101, a radio module 103 inside the housing 101, wherein the radio module 103 comprises a first antenna 104 extending along a first direction d1. Moreover, the housing 101 comprises a slot antenna 102 defined by a recess in one of the walls of the housing 101, extending along a second direction d2, wherein the slot antenna 102 is electromagnetically coupled to the first antenna 104, and wherein an angle α is defined the first direction d1 and the second direction d2. The lighting module 100 is configured such that this angle can be adjusted by changing the directions d1 and d2 relative to each other.

[0023] This provides the advantage that the slot antenna 102 or its position or at least its orientation d2 relative to the first antenna 104 of the radio module 103 is adjustable to ensure an optimized emission of radio signals without the need of providing an antenna projecting from the outer surface of the metal housing.

[0024] The lighting module 100 can be a luminaire, in particular an LED luminaire. The lighting module 100 can comprise a plurality of LEDs and an LED driver for providing electrical energy to the LEDs. The LED driver can be arranged in the housing 101. It is to be noted that the radio module 103 may be integrated in the LED driver.

[0025] The slot antenna 102 can be a dipole antenna, in particular a λ / 2 dipole antenna.

[0026] The radio module 103, schematically represented by an ellipse in the figures, can be an RF module which is configured to transmit and / or receive RF (radio frequency) signals. For example, the RF signals can be control signals or status signals.

[0027] As indicated above, the housing 101 can be a metal housing, which prevents radio emission of the first antenna 104 to be radiated at other positions and towards other directions apart from the second antenna 102. Thus, the overall emission characteristics can be designed by adjusting the size of the second antenna 102 together with the orientation of the first antenna 104 and the second antenna 102 relative to each other.

[0028] It is to be noted that in the top view of the sidewall of the housing 101 in the figures, the radio module 103 and the second antenna 102 are shown to be arranged in a non-overlapping manner only in order to facilitate the understanding of the drawing. However, the position of the radio module 103 is usually chosen such that the first antenna 104 and the second antenna 102 to overlap at least partially.

[0029] Fig. 2 shows an embodiment of the lighting module 100 according to a first alternative present in the independent claim.

[0030] In this embodiment, a rotational element 201 is provided in the housing 101, in which element the actual slot antenna 102 is arranged. Usually, the element, in which the rotational element 201 is provided, is a sidewall of the metallic housing 101. By rotating the rotational element 201, the orientation d1 of the slot antenna 102 (second antenna) is adjusted relative to the housing 101 and, ultimately, to the radio module 103 fixedly arranged in the housing 101 by means of the fixing elements 103a and 103b. In this embodiment, the position and the orientation of the first antenna 104 relative to the entire radio module 103 are fixed. Thus, the relative orientation between the first direction and the second direction is adjusted by rotating the rotation element 201. In the advantageous embodiment shown in figure 2, the rotational element 201 has a disc shape with a circular circumference. However, different shapes of the circumference may be thought of as long as they allow different rotational positions. This could for example be achieved by using a regular hexagon. Of course, the recess in the sidewall of the housing 101 must have a corresponding shape so that the rotational element 201 can be inserted at different rotational positions.

[0031] As shown in the drawing, the rotational element 201 is a disk rotatably mounted in the sidewall of the housing. Such a disc can be formed with an outer edge that secures the disk-shaped rotational element 201 to an annular recess in the sidewall of the housing 101 such that the rotation element 201 may be rotated but is permanently arranged in the recess. Contrary, in case of for example the regular hexagon mentioned above, the rotational element 201 must be detached, rotated and attached again in order to change its orientation.

[0032] The slot antenna 102 is arranged in the disk. In order to ensure that the orientation of the rotational element 201 is not changed unintentionally, it is preferred that friction between the rotational element 201 and the sidewall in which the rotational element 201 is arranged large enough so that a change of the orientation of the rotational element 201 can only be achieved by using a tool such as a screwdriver.

[0033] Fig. 3 shows a further embodiment of the lighting module 100 according to a second alternative present in the independent claim.

[0034] In this embodiment, the slot antenna 102 in the housing 101 cannot be adjusted with respect to its orientation. The slot antenna 102 is established by a recess that is arranged in a sidewall of the housing 101. In order to be able to set the relative orientation of the two elements (slot antenna 102 and first antenna 104 of the radio module 103), the radio module 103 or at least its antenna 104 can variably be mounted in the housing 104. For this purpose, several positioning elements 301 (e.g. positioning holes or pins) are arranged in the area of the slot antenna 102, so that the first antenna 104 of the radio module 103 can be rotated in this area by positioning the entire radio module 103 such that the desired orientation of the first direction and the second direction relative to each other is achieved. On the radio module 103 there are provided corresponding elements that interact with the positioning elements 301. For example, in case that positioning holes are formed in the sidewall of the housing 101 as positioning elements 301, the radio module 103 is provided with projections that can protrude into the holes of the housing 101. By rotating the entire radio module 103 and then inserting its projections into the respective positioning holes, the desired orientation of the radio module 103 relative to the slot antenna 102 can be set. Having achieved this desired relative orientation, the radio module 103 is then fixed to the housing 101, preferably using conventional fixing technology like, for example, screws clamping a flange of the radio module 103 to the housing 101. Alternatively, in case that the positioning elements 301 are realized as pins that project from an inner side of the sidewall of the housing 101, the radio module 103 provides recesses into which the positioning elements 301 of the housing 101 can be inserted.

[0035] Further, it is also possible that the radio unit 103 provides projections that can interact with the spaces between such projections as positioning elements 301 in order to avoid undesired rotation of the radio module 103. Again, once the desired orientation of the first antenna 104 and the second antenna 102 is adjusted, the radio module 103 is fixed to the housing 101 such that the radio module 103 is securely attached to the side wall of the housing 101 by means of screws, for example. It must be ensured that the overall design of the luminaire or rather the lighting module 100 allows the radio module 103 to be rotated in order to freely adjust the orientation of the first antenna 104 and the second antenna 102 relative to each other. Thus, there should be enough space in the housing 101 of the lighting module 101 in order to rotate the radio module 103.

[0036] In particular, in the embodiment shown in Fig. 3, the positioning elements 301 are arranged along a circle around a portion of the slit antenna 102. This allows to arrange the radio module 103 at different angles relative to the slot antenna 102 by means of the fixing element indicated as 103c in the drawing and representing the corresponding structure of the radio module 103 interacting with the positioning elements 301.

[0037] While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only and not limitation.

[0038] Thus, the breadth and scope of the present invention should not be limited by any of the above-described embodiments.

[0039] While a particular feature of the invention may have been disclosed with respect to only of the several implementations, such features may be combined with one or more other features of the other implementations as may be desired and advantage for any given or particular application.

Examples

Embodiment Construction

[0020]For describing the present invention in greater detail, the expression 'LED luminaire' shall mean a luminaire with a light source comprising one or more LEDs or OLEDs. LEDs are well-known in the art, and therefore, will only briefly be discussed to provide a complete description of the invention.

[0021]Now referring to Fig. 1, a lighting module 100 according to the invention is shown according to a basic embodiment.

[0022]The lighting module 100 comprises a metal housing 101, a radio module 103 inside the housing 101, wherein the radio module 103 comprises a first antenna 104 extending along a first direction d1. Moreover, the housing 101 comprises a slot antenna 102 defined by a recess in one of the walls of the housing 101, extending along a second direction d2, wherein the slot antenna 102 is electromagnetically coupled to the first antenna 104, and wherein an angle α is defined the first direction d1 and the second direction d2. The lighting module 100 is configured such tha...

Claims

1. A lighting module (100), comprising: - a housing (101); - a radio module (103) inside the housing (101), wherein the radio module (103) comprises a first antenna (104) extending along a first direction (d1); and - a slot antenna (102) inside the housing (101) extending along a second direction (d2), - wherein the slot antenna (102) is electromagnetically coupled to the first antenna (104), and - wherein an angle (α) between the first direction (d1) and the second direction (d2) is adjustable, characterized in that: the first antenna (104) is in a fixed position with respect to the housing (101), and the housing (101) further comprises a rotational element (201) and the slot antenna (102) is arranged on the rotational element (201), or the radio module (103) is configured to allow first antenna (104) to be rotated with respect to the slot antenna (102) arranged fixedly in the housing (101), wherein the housing (101) further comprises a plurality of positioning elements (301) cooperating with one or more corresponding elements (103c) of the radio module (103) such that the radio module (103) can be positioned in a plurality of orientations relative to the slot antenna (102), and wherein the positioning elements (301) are arranged along a circle around a portion of the slot antenna (102).

2. The lighting module (100) of claim 1, wherein in the case that the first antenna (104) is in a fixed position with respect to the housing (101), and the housing (101) further comprises a rotational element (201) and the slot antenna (102) is arranged on the rotational element (201), the rotational element (201) is a disk.

3. The lighting module (100) of claim 1 or 2, wherein the housing (101) is a metal housing.

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