Illuminating device of light source plate direct feed slot antenna

Abstract

The invention provides a lighting device of a light source plate direct-feed slot antenna. The lighting device comprises a light source plate; the heat dissipation piece is in contact with the light source plate; the radio frequency module comprises a feed structure and a connector, the feed structure is arranged on the side, deviating from the light emitting surface, of the light source plate, the connector is connected with the conductive layer of the light source plate and / or the conductive layer of the heat dissipation piece, and the feed structure is connected with the connector; at least one of the light source plate and the heat dissipation piece is provided with a groove hole. The feed structure directly feeds radio frequency energy to the slotted hole through the connector, and the slotted hole is used for radiating the received radio frequency energy outwards. According to the invention, a direct feed mode is adopted, the module end is in contact with the conducting layer above the heat dissipation piece or the light source plate through the connector, then a slot antenna mode is formed through the slotted hole designed in the light source plate, only one connecting part is needed to directly feed radio frequency energy to the slotted hole of the heat dissipation piece, and the performance is better than the coupling feed performance.

Description

Technical Field

[0001] The present application relates to the technical field of lamps, and in particular to a lighting device with a light source board directly fed slot antenna. Background Art

[0002] In the era of the Internet of Everything, people are increasingly demanding smart products, especially in the smart home field, where the performance requirements for smart lamps are increasing. Among them, smart bulbs not only have traditional lighting functions, but also have wireless communication modules installed to achieve complex functions such as dimming and color adjustment, voice control, etc. through wireless communication.

[0003] In order to send and receive wireless signals, smart bulbs are equipped with antennas. These wireless transceiver modules contain antennas that can radiate electromagnetic waves. The driver board of the smart bulb is connected to the light source board through terminals. At the same time, a wireless transceiver module is welded on the driver board. A notch is opened on the light source board to extend the antenna vertically out of the light board. The antenna options generally include spring antennas, ceramic antennas, and onboard antennas. These antennas extend downward from the light board, and the extended antennas block the light emitted by the lamp beads on the light board to a certain extent, which leads to uneven lighting of the smart bulb and even shadows. Summary of the invention

[0004] In order to solve the above technical problems, the present application proposes a lighting device of a light source board direct-fed slot antenna, comprising: a light source board; a heat sink, the heat sink is in contact with the light source board; a radio frequency module, comprising a feeding structure and a connector, the feeding structure is arranged on the side of the light source board away from the light emitting surface, the connector is connected to the conductive layer of the light source board and / or the conductive layer of the heat sink, and the feeding structure is connected to the connector; wherein, at least one of the light source board and the heat sink is provided with a slot; the feeding structure feeds the radio frequency energy directly to the slot through the connector, and the slot is used to radiate the received radio frequency energy outward.

[0005] The above technical solution adopts a direct-feed form, and the RF module does not need to design an additional antenna to couple the slots on the lamp body, thereby reducing the material cost of the RF module with the antenna part, and further realizing the standardization of the module itself.

[0006] Specifically, the slot is a fully enclosed hole, and the perimeter C of the slot satisfies: Where λ is the free space wavelength corresponding to the RF antenna frequency band.

[0007] Specifically, the slot is a fully enclosed hole, and the perimeter C of the slot satisfies: Where λ is the free space wavelength corresponding to the RF antenna frequency band.

[0008] Specifically, at least one slot is filled with a dielectric material.

[0009] Specifically, the connector is arranged at the edge of the slot.

[0010] Specifically, it also includes: a driving board, which is arranged on one side of the light source board, and the driving board is electrically connected to the light source board.

[0011] Specifically, the RF module also includes: a RF signal processing chip and a RF circuit, which are arranged on the side of the light source board away from the light emitting surface or on the driving board; the RF antenna output pin of the RF circuit is connected to the feeding structure.

[0012] Specifically, the heat sink is made of a material with a resistivity less than 0.01Ωm.

[0013] Specifically, when the slot is uniformly filled with dielectric material and the slot is a fully enclosed hole, the perimeter C of the slot satisfies: When the slot is uniformly filled with dielectric material and is a semi-closed hole, the perimeter C of the slot satisfies: in, λ 介质 The antenna wavelength of the slot under this condition is, 介质 is the relative dielectric constant of the dielectric material.

[0014] Specifically, when one side of the slot is filled with dielectric material and the slot is a fully enclosed hole, the perimeter C of the slot satisfies: When one side of the slot is filled with dielectric material and the slot is a semi-closed hole, the perimeter C of the slot satisfies: in, λ (介质+空气) The antenna wavelength of the slot under this condition is, 介质 is the relative dielectric constant of the dielectric material.

[0015] Compared with the prior art, the beneficial results of this application are:

[0016] 1. The antenna adopts a direct feeding form, which contacts the conductive layer above the heat sink or light source board through the connector from the module end, and then forms a slot antenna through the slot designed on the light source board. Only one connection part is needed to feed the RF energy directly to the slot of the heat sink, and the performance is better than the coupled feeding performance.

[0017] 2. The RF module does not need to design an additional antenna to couple the slots on the lamp body, which reduces the material cost of the RF module with antenna and further realizes the standardization of the module itself.

[0018] 3. The antenna no longer extends out of the light source board, avoiding the antenna from blocking the light. This makes the light distribution of the smart lamp more uniform and improves the lighting quality.

[0019] 4. The RF circuit no longer needs to be welded on the back of the light source board and can be placed on the driver board or anywhere else on the smart light, reducing the difficulty of the welding process.

[0020] 5. Design irregular slots or introduce additional slots on the light source board, and use the perimeter to define the size of the slots. By changing the size of the perimeter of the slots, the effective path of the antenna's induced current can be changed. This can not only achieve the multi-band, omnidirectional, circular polarization and other characteristics of the antenna, but also solve the problems of riveting deformation in the process and limited space of the light source board.

[0021] 6. The antenna is also a conformal model, which simplifies the assembly process and can be automated, thus improving product production efficiency and cost.

[0022] 7. Realize the standardized design of RF circuits and antennas, realize the sharing of multiple products, and reduce the development cycle and development costs.

[0023] 8. A slot antenna is implemented on the light source board and the heat sink, and the antenna radiation pattern of the slot antenna is directed toward the light bulb, thereby effectively preventing the lighting lamp from being affected by the lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and are used together with the description to explain the principles of the present application. It will be easy to recognize other embodiments and many expected advantages of the embodiments because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. The same reference numerals refer to corresponding similar parts.

[0025] Figure 1 It is a schematic diagram of the exploded structure of a lighting device of a light source plate direct-fed slot antenna according to an embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of a lighting device of a light source plate directly fed slot antenna according to the first embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the three-dimensional structure of a lighting device of a light source plate directly fed slot antenna according to the second embodiment of the present application;

[0028] Figure 4 is a schematic diagram of the three-dimensional structure of a lighting device of a light source plate direct-fed slot antenna according to the third embodiment of the present application;

[0029] Figure 5 is a schematic diagram of the three-dimensional structure of a lighting device of a light source plate directly fed slot antenna according to the fourth embodiment of the present application;

[0030] Figure 6It is a return loss diagram of a slot antenna of a lighting device of a light source plate directly fed slot antenna according to an embodiment of the present application;

[0031] Figure 7 It is a current vector distribution diagram of a slot antenna of a lighting device of a light source board direct-fed slot antenna according to an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1. Light source board; 2. Heat sink; 3. RF module; 4. Slot; 101. Conductive layer; 102. LED; 301. Connector; 302. RF circuit; 303. RF signal processing chip; 5. Driver board. DETAILED DESCRIPTION

[0034] In the following detailed description, reference is made to the accompanying drawings, which form a part of the detailed description and are shown by illustrative specific embodiments in which the present application can be practiced. To this end, directional terms, such as "top", "bottom", "left", "right", "up", "down", etc., are used with reference to the orientation of the figures described. Because the components of the embodiments can be positioned in several different orientations, directional terms are used for the purpose of illustration and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present application. Therefore, the following detailed description should not be adopted in a limiting sense, and the scope of the present application is defined by the appended claims.

[0035] like Figure 1 As shown, a lighting device of a light source board direct-fed slot antenna comprises: a light source board 1; a heat sink 2, the heat sink 2 is in contact with the light source board 1; a radio frequency module 3, comprising a feeding structure and a connector 301, the feeding structure is arranged on the side of the light source board 1 away from the light emitting surface, the connector 301 is connected to the conductive layer 101 of the light source board 1 and / or the conductive layer 101 of the heat sink 2, and the feeding structure is connected to the connector 301; wherein, at least one of the light source board 1 and the heat sink 2 is provided with a slot 4; the feeding structure directly feeds radio frequency energy to the slot 4 through the connector 301, and the slot 4 is used to radiate the received radio frequency energy outward.

[0036] The above technical solution adopts the direct feeding form, and the RF module 3 does not need to design an additional antenna to couple the slot 4 on the lamp body, which reduces the material cost of the RF module 3 with the antenna part, and further realizes the standardization of the module itself.

[0037] The slot hole 4 is a fully enclosed hole, and the perimeter C of the slot hole 4 satisfies: Where λ is the free space wavelength corresponding to the RF antenna frequency band.

[0038] Furthermore, the slot hole 4 is a fully enclosed hole, and the perimeter C of the slot hole 4 satisfies: Where λ is the free space wavelength corresponding to the RF antenna frequency band.

[0039] Furthermore, at least one slot 4 is filled with a dielectric material.

[0040] Furthermore, the connector 302 is disposed at the edge of the slot 4 .

[0041] Furthermore, it also includes: a driving board 5 , which is arranged on one side of the light source board 1 , and is electrically connected to the light source board 1 .

[0042] Furthermore, the RF module 3 also includes: a RF signal processing chip 303 and a RF circuit 302, which are arranged on the side of the light source board 1 away from the light emitting surface or on the driving board 5; the RF antenna output pin of the RF circuit 302 is connected to the feeding structure.

[0043] Furthermore, the heat sink 2 is made of a material with a resistivity less than 0.01Ωm.

[0044] Furthermore, when the slot 4 is uniformly filled with dielectric material and the slot 4 is a fully enclosed hole, the perimeter C of the slot 4 satisfies: When the slot 4 is uniformly filled with dielectric material and the slot 4 is a semi-closed hole, the perimeter C of the slot 4 satisfies: in, λ 介质 Under this condition, the antenna wavelength of slot 4 is, 介质 is the relative dielectric constant of the dielectric material.

[0045] Furthermore, when one side of the slot 4 is filled with dielectric material and the slot 4 is a fully enclosed hole, the perimeter C of the slot 4 satisfies: When one side of the slot 4 is filled with dielectric material and the slot 4 is a semi-closed hole, the perimeter C of the slot 4 satisfies: in, λ (介质+空气) Under this condition, the antenna wavelength of slot 4 is, 介质 is the relative dielectric constant of the dielectric material.

[0046] In the first embodiment of this application, please refer to Figure 2 In this embodiment, the feeding method is to drive the shrapnel pin (equivalent to Figure 1 The middle connector 302) directly contacts the metal structure at the edge of the metal gap slot hole and directly feeds power; at the same time, the slot hole 4 in this embodiment is semi-closed.

[0047] In the second embodiment of this application, please refer to Figure 3In this embodiment, the slot 4 is a semi-closed slot. Different from the first embodiment, in this embodiment, the RF signal emitted by the RF module 3 is transmitted to the slot 4 through the RF antenna feed part 301 and the connector 302 connected to the RF circuit antenna output pin 303.

[0048] In the third and fourth embodiments of this application, please refer to Figure 4 and Figure 5 In the use scenario where the lumen requirement is not high, the material selection of the light source board 1 tends to be glass fiber board, that is, PCB board. On this glass fiber board, a specific feeding method can be used to construct a slot antenna. The way to achieve this is to use the copper layer to open the slot hole 4, so as to achieve the design effect of the slot antenna.

[0049] For example, in a double-sided board structure, the seams opened by the copper layers of the TOP layer and the BOT layer are completely consistent in shape and size. For multi-layer boards, the same design principle is followed.

[0050] This design method can effectively build a stable slot antenna on the fiberglass board on the basis of meeting the low lumen requirements, thus providing a feasible technical solution for the overall performance optimization of lighting products. While ensuring the realization of the antenna function, the compatibility with the low lumen light source board can also be better taken into account, which is conducive to improving the comprehensive performance of the product and the rationality of the design.

[0051] Furthermore, in order to illustrate the advantages of the present application over the prior art, Figure 1 Taking the embodiment shown in the figure as an example, a current vector distribution diagram is drawn. Figure 6 The current density (Jsurf) distribution in different areas is shown, with the color gradient from blue to red, representing the current density from low to high. The blue area indicates a lower current density, while the red area indicates a higher current density. Obviously, the performance of the direct-fed slot antenna is very good, and the RF energy of the RF circuit can be well transferred to the slot. The RF energy is excited from the metal terminal of the feed part and distributed around the slot.

[0052] In addition, further drawing Figure 1 The return loss diagram of the slot 4 antenna of the embodiment is as follows: Figure 7 In the figure, the horizontal axis represents frequency (Freq), in GHz, ranging from 2.00GHz to 3.50GHz. The vertical axis represents return loss, in dB (S(2,2)), ranging from -14.00dB to 0.00dB.

[0053] The curves in the figure show the return loss at different frequencies. Return loss is a measure of the degree of signal reflection during transmission and is often used to evaluate the performance of antennas, cables, or other radio frequency (RF) devices. Lower return loss values ​​(closer to 0dB) indicate less signal reflection and higher transmission efficiency, while higher return loss values ​​(closer to -14dB) indicate more signal reflection and lower transmission efficiency.

[0054] As can be seen from the figure:

[0055] Between 2.00 GHz and 2.25 GHz, the return loss value is relatively low, close to 0 dB, indicating that the signal transmission efficiency is high in this frequency range.

[0056] Between 2.25GHz and 2.75GHz, the return loss value rises sharply to around -14dB, indicating that there are more signal reflections and lower transmission efficiency in this frequency range.

[0057] Between 2.75 GHz and 3.50 GHz, the return loss value gradually decreases and returns to a level close to 0 dB, indicating that the signal transmission efficiency is improved again in this frequency range.

[0058] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present application without departing from the spirit and scope of the present application. In this way, if these modifications and changes are within the scope of the claims of the present application and their equivalents, the present application is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recorded in mutually different dependent claims does not indicate that the combination of these measures cannot be used to profit. Any figure mark in the claims should not be considered to limit the scope.

Claims

1. A lighting device with a light source plate directly fed slot antenna, characterized in that: include: Light source board; A heat sink, the heat sink being in contact with the light source panel; A radio frequency module, comprising a feeding structure and a connector, wherein the feeding structure is arranged on a side of the light source board away from the light emitting surface, the connector is connected to the conductive layer of the light source board and / or the conductive layer of the heat sink, and the feeding structure is connected to the connector; A slot is provided on at least one of the light source board and the heat sink; the feeding structure directly feeds the radio frequency energy to the slot through the connector, and the slot is used to radiate the received radio frequency energy outward.

2. The lighting device of the light source plate direct-fed slot antenna according to claim 1, characterized in that: The slot is a fully enclosed hole, and the perimeter C of the slot satisfies: Where λ is the free space wavelength corresponding to the RF antenna frequency band.

3. The lighting device of the light source plate direct-fed slot antenna according to claim 1, characterized in that: The slot is a semi-closed hole, and the perimeter C of the slot satisfies: Wherein, λ is the free space wavelength corresponding to the RF antenna frequency band, and the perimeter C of the semi-closed hole is the perimeter calculated after adding a virtual straight line to the end of the slot.

4. The lighting device of the light source plate direct-fed slot antenna according to any one of claims 2 to 3, characterized in that: At least one of the slots is filled with a dielectric material.

5. The lighting device of the light source plate direct-fed slot antenna according to claim 1, characterized in that: The connector is arranged at the edge of the slot.

6. The lighting device of the light source plate direct-fed slot antenna according to claim 1, characterized in that: Also includes: A driving board is disposed on one side of the light source board, and the driving board is electrically connected to the light source board.

7. The lighting device of the light source plate direct-fed slot antenna according to claim 6, characterized in that: The RF module also includes: a RF signal processing chip and a RF circuit, which are arranged on the side of the light source board away from the light emitting surface or on the driving board; the RF antenna output pin of the RF circuit is connected to the feeding structure.

8. The lighting device of the light source plate direct-fed slot antenna according to claim 1, characterized in that: The heat sink is made of a material with a resistivity less than 0.01Ωm.

9. The lighting device of the light source plate direct-fed slot antenna according to claim 4, characterized in that: When the slot is uniformly filled with dielectric material and the slot is a fully enclosed hole, the perimeter C of the slot satisfies: When the slot is uniformly filled with dielectric material and the slot is a semi-closed hole, the perimeter C of the slot satisfies: in, λ 介质 Under this condition, the antenna wavelength of the slot is, 介质 is the relative dielectric constant of the dielectric material.

10. The lighting device of the light source plate direct-fed slot antenna according to claim 4, characterized in that: When one side of the slot is filled with dielectric material and the slot is a fully enclosed hole, the perimeter C of the slot satisfies: When one side of the slot is filled with dielectric material and the slot is a semi-closed hole, the perimeter C of the slot satisfies: in, λ (介质+空气) Under this condition, the antenna wavelength of the slot is, 介质 is the relative dielectric constant of the dielectric material.

Images