High-gain switch panel

Abstract

The utility model relates to a high-gain switch panel. The high-gain switch panel comprises a housing; the PCB is arranged on the bottom surface of the shell, and the PCB is provided with a reference ground and a radio frequency chip; the planar antenna is arranged on the PCB and comprises a short circuit unit and a feed point unit, one end of the short circuit unit and one end of the feed point unit are in short circuit, the other end of the short circuit unit and the other end of the feed point unit are connected to a reference ground, and the short circuit unit, the feed point unit and the reference ground form a loop. The feed point units are connected to the signal output ends of the corresponding radio frequency chips; the three-dimensional antenna is arranged on the side face of the shell, the three-dimensional antenna is electrically connected to the feed point unit, and the distance between the three-dimensional antenna and the reference ground is larger than 2 mm.

Description

Technical Field

[0001] The utility model relates to the field of switch panels, in particular to a high-gain switch panel. Background Art

[0002] In the field of smart home, built-in antennas are more common, mainly divided into: 1. FPC antennas, which have better performance, but have high requirements for clearance, the structure has a greater impact on antenna performance, and the cost is also high; 2. Metal antennas: moderate debugging difficulty, requiring a larger clearance area and structural position; 3. Printed circuit board antennas: This type of antenna has low efficiency, limited gain, and a relatively single planar antenna radiation surface. Smart home devices such as speakers, cameras, switches, etc. need to fit more devices in a limited space. Due to the large size of common antennas and the large clearance area requirements, smart home devices need to reserve enough space for antennas, resulting in their size being unable to be further reduced. And most of the antennas on the market use planar antennas. Limited by the antenna environment and the planar shape of the antenna, the electromagnetic waves radiate to the free space to a limited extent, and the gain and efficiency of the antenna are further reduced.

[0003] The purpose of the present invention is to design a high-gain switch panel in view of the above-mentioned problems in the prior art. Utility Model Content

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a high-gain switch panel, which can effectively solve at least one problem existing in the above-mentioned prior art.

[0005] The technical solution of the utility model is:

[0006] A high-gain switch panel, comprising:

[0007] case;

[0008] A PCB board is arranged on the bottom surface of the housing, and the PCB board is provided with a reference ground and a radio frequency chip;

[0009] A planar antenna, arranged on the PCB board, comprising a short-circuit unit and a feed point unit, wherein one end of the short-circuit unit and the feed point unit is short-circuited, and the other ends of the short-circuit unit and the feed point unit are connected to a reference ground, wherein the short-circuit unit, the feed point unit, and the reference ground form a loop, and the feed point unit is connected to a signal output end of a corresponding radio frequency chip;

[0010] A three-dimensional antenna is arranged on a side surface of the shell, the three-dimensional antenna is electrically connected to the feed point unit, and a distance between the three-dimensional antenna and the reference ground is greater than 2 mm.

[0011] Furthermore, the short-circuit unit and the feeding point unit are both conductive arms, and the short-circuit unit is bent from one end of the feeding point unit to be perpendicular to the feeding point unit and then to be parallel to the short-circuit unit.

[0012] Furthermore, the short-circuit unit and the feed point unit are printed antennas arranged on the PCB board.

[0013] Furthermore, the width of the short-circuit unit is 0.8-1.2 mm, and / or the width of the feed point unit is 0.8-1.2 mm.

[0014] Furthermore, the distance between the short-circuit unit and the feeding point unit is 2-4 mm.

[0015] Furthermore, the short-circuit unit and the feeding point unit are arranged in parallel.

[0016] Furthermore, the distance between the three-dimensional antenna and the PCB board is 4-6 mm, and / or the width of the three-dimensional antenna is 1.3-1.7 mm.

[0017] Furthermore, the three-dimensional antenna is a steel sheet antenna, and the steel sheet antenna is welded or screwed to the feed point unit.

[0018] Furthermore, the three-dimensional antenna is an FPC antenna, and the FPC antenna is connected to the feed point unit via a coaxial cable.

[0019] Furthermore, it includes a tuning network, which is arranged between the feed point unit and the signal output end of the radio frequency chip.

[0020] Therefore, the utility model provides the following effects and / or advantages:

[0021] This application combines a planar antenna and a three-dimensional antenna, as well as the shape of the switch panel and the placement of the antenna, so as to form a compact antenna with excellent performance to meet the requirements of smart homes and smart devices for antenna performance and small structural space. Through the design of the antenna and the formation of capacitance between the antenna and the reference ground, the electromagnetic wave energy is concentrated in the radio frequency unit as much as possible, with less loss and more signals radiated into free space.

[0022] The present application solves the problem that insufficient space is left for the antenna in a smart device, resulting in insufficient electrical length of the antenna, and effectively increases the radiation range of the antenna to improve signal quality and optimize the quality of the signal transmission process.

[0023] The special-shaped antenna provided in the present application can combine the advantages of both planar antennas and three-dimensional antennas, effectively compensating for the problem of insufficient clearance area due to the small space; the internal space of the smart device structure can be utilized to increase the three-dimensional sense of the antenna, thereby optimizing the antenna field pattern and improving the antenna gain to the greatest extent.

[0024] The present application can realize a three-dimensional antenna through an FPC antenna. The flexible circuit board can also be used to enhance the three-dimensional effect of the antenna and change the antenna field pattern to increase the required radiation angle and direction and transmit data in a directional manner with the device.

[0025] In addition, the adaptability of the antenna can be enhanced, and the requirements for the structure are relatively low.

[0026] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0027] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the switch panel of the utility model, wherein the radiation unit adopts a steel sheet antenna.

[0029] Figure 2 It is a schematic diagram of the antenna of the present invention.

[0030] Figure 3 Figure 2 is a connection diagram of the tuning network.

[0031] Figure 4 It is a schematic diagram of the switch panel of the utility model, wherein the radiation unit adopts an FPC antenna.

[0032] Figure 5 It is a connection diagram between the FPC antenna, coaxial line, feed point unit and short-circuit unit.

[0033] Figure 6 This is a 3D far-field simulation diagram of an embodiment of the present utility model. DETAILED DESCRIPTION

[0034] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the accompanying drawings:

[0035] Embodiment 1

[0036] refer to Figure 1-3, a high-gain switch panel, comprising:

[0037] Shell (not shown);

[0038] A PCB board 1 is arranged on the bottom surface of the housing, and the PCB board 1 is provided with a reference ground 101 and a radio frequency chip 102;

[0039] A planar antenna 2, arranged on the PCB board 1, comprises a short-circuit unit 201 and a feed point unit 202, wherein one end of the short-circuit unit 201 and the feed point unit 202 are short-circuited, and the other ends of the short-circuit unit 201 and the feed point unit 202 are connected to the reference ground 101, wherein the short-circuit unit 201, the feed point unit 202 and the reference ground 101 form a loop and are equivalent to an inductive reactance at high frequencies, and the feed point unit 202 is connected to a signal output end of a corresponding radio frequency chip 3;

[0040] The stereo antenna 4 is arranged on the side of the shell, the stereo antenna 4 is electrically connected to the feed point unit 202, the distance between the stereo antenna 4 and the reference ground 101 is greater than 2mm, and the stereo antenna 4 and the reference ground 101 are equivalent to capacitive reactance at high frequency.

[0041] In this embodiment, through the combination of the planar antenna and the three-dimensional antenna, a part of the signal output by the RF chip is connected to the radiation unit 3 via the feed point unit 1, and radiates electromagnetic wave signals to the free space. The radiation unit 3 is the main radiation structure, and the other part flows back to the reference ground via the short-circuit unit 2 to form a complete signal return path. This part radiates a small amount of electromagnetic waves, and the short-circuit unit 2 is a secondary radiation structure. The short-circuit unit 2 mainly exhibits inductive reactance in the high-frequency state. Since the antenna needs to meet the resonance condition, it is necessary to introduce a capacitive reactance part at the other end, and the capacitive reactance part is implemented by the radiation unit 3.

[0042] Furthermore, the provided special-shaped antenna can combine the advantages of both the planar antenna and the three-dimensional antenna, effectively making up for the problem of insufficient clearance area 102 due to the small space.

[0043] The principle of this special-shaped antenna is similar to that of an inverted F antenna. The inverted F antenna can be equivalent to a short-circuit part and an open-circuit part in parallel to form a parallel resonant circuit. When the antenna resonates, the electromagnetic wave energy is concentrated in the RF unit as much as possible, resulting in less loss and more signals radiated into free space.

[0044] Preferably, the bottom surface and the side surfaces of the shell are perpendicular to each other.

[0045] Furthermore, the short-circuit unit 201 and the feed point unit 202 are both conductive arms, and the short-circuit unit 201 is bent from one end of the feed point unit 202 to be perpendicular to the feed point unit 202 and then to be parallel to the short-circuit unit 201 .

[0046] The short-circuit unit 201, the feed point unit 202 and the reference ground 101 form a U-shaped structure, which is similar to a coil and has the property of inductance. Therefore, it can be equivalent to inductive reactance at high frequencies.

[0047] Furthermore, the short-circuit unit 201 and the feed point unit 202 are printed antennas arranged on the PCB board.

[0048] Furthermore, the width of the short-circuit unit 201 is 0.8-1.2 mm, and / or the width of the feed point unit 202 is 0.8-1.2 mm.

[0049] In this embodiment, the short-circuit unit 201 and the feed point unit 202 are composed of printed antennas on a PCB board, and the material is made of ordinary microstrip lines. The width of the short-circuit unit 201 and the feed point unit 202 is preferably 1 mm.

[0050] Furthermore, the distance between the short-circuit unit 201 and the feeding point unit 202 is 2-4 mm.

[0051] In this embodiment, the distance between the short-circuit unit 201 and the feed point unit 202 is set according to the environment around the antenna, preferably 3 mm. If there are many metal environments around the antenna, it can be understood that the capacitance coupled to the antenna will be too large. At this time, it is necessary to reduce the distance between the short-circuit unit 201 and the feed point unit 202. If there are few metal structures, the distance can be appropriately increased.

[0052] Furthermore, the short-circuit unit 201 and the feeding point unit 202 are arranged in parallel.

[0053] Furthermore, the distance between the three-dimensional antenna 4 and the PCB board is 4-6 mm, and / or the width of the three-dimensional antenna 4 is 1.3-1.7 mm.

[0054] In this embodiment, this embodiment can be applicable to WIFI antennas. The WIFI antenna can use 2.4G, and the designed frequency band is 2405-2480MHz. The corresponding wavelength is 125mm. According to the length of 1 / 4 wavelength, the length of the three-dimensional antenna 4 needs to be about 3cm. Similarly, according to actual measurements of the environment, the width of the three-dimensional antenna 4 is about 1.5mm, which is optimal.

[0055] Alternatively, if Figure 1-3 As shown, the three-dimensional antenna 4 is a steel sheet antenna, and the steel sheet antenna is welded or screwed to the feed point unit 202 .

[0056] The connection between the PCB board 1 and the steel sheet of this embodiment is welded, which can ensure the stability and reliability of the structure of this part and facilitate the assembly operation. Only one contact point needs to be welded; or the antenna can be further fixed by locking screws.

[0057] Alternatively, if Figure 4 As shown, the three-dimensional antenna 4 is an FPC antenna, and the FPC antenna is connected to the feed point unit 202 via a coaxial line.

[0058] In this embodiment, in addition to the steel sheet antenna, the three-dimensional antenna 4 can also use a coaxial line to lead the radio frequency signal to the FPC antenna on the flexible circuit board, and then attach the flexible circuit board to the corner of the structure to radiate the wireless signal; the coaxial line is composed of two coaxial cylindrical conductors, the inner conductor is filled with an insulating high-frequency medium, and the outer part is a signal transmission cable made of an insulating shielding material; the electromagnetic wave is confined to the inner conductor, so the coaxial line has a good signal transmission function, the radiation loss is very small, and it is not easily interfered by external signals. The flexible circuit board is attached to the side wall or side frame of the structure as the main radiation unit of the antenna, which makes up for the problem of insufficient electrical length caused by insufficient space of the PCB board 1, increases the three-dimensional sense of the antenna, and thus improves efficiency. The feed line of the coaxial line is connected to the feed point unit 202, and the ground wire of the coaxial line is connected to the short-circuit unit 2 to form a complete loop.

[0059] Furthermore, it includes a tuning network 5 which is arranged between the feed point unit 202 and the signal output end of the RF chip 3 .

[0060] In this embodiment, the tuning network 5 can be a π-type network, and each device of the π-type network is composed of capacitors or inductors. The relevant parameters of the series and parallel matching devices are adjusted to obtain the optimal standing wave ratio and return loss. At the same time, the effective bandwidth under the 2.4G frequency band is broadened, so that the device can adapt to the external environment. This solution can broaden the effective bandwidth to about 200M. The wider the bandwidth, the stronger the antenna's ability to adapt to the environment, and the less the communication performance is affected by the external environment; the adjusted return loss is below -15dB, and the standing wave ratio is about 1.3, indicating that 95% of the energy output from the signal of the RF chip 3 is radiated through the antenna.

[0061] It should be noted that in the claims, any reference signs placed between brackets shall not be constructed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The utility model can be implemented with the aid of hardware comprising several different components and with the aid of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same hardware item. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0062] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A high-gain switch panel, characterized in that: include: case; A PCB board is arranged on the bottom surface of the housing, and the PCB board is provided with a reference ground and a radio frequency chip; A planar antenna, arranged on the PCB board, comprising a short-circuit unit and a feed point unit, wherein one end of the short-circuit unit and the feed point unit is short-circuited, and the other ends of the short-circuit unit and the feed point unit are connected to a reference ground, wherein the short-circuit unit, the feed point unit, and the reference ground form a loop, and the feed point unit is connected to a signal output end of a corresponding radio frequency chip; A three-dimensional antenna is arranged on a side surface of the shell, the three-dimensional antenna is electrically connected to the feed point unit, and a distance between the three-dimensional antenna and the reference ground is greater than 2 mm.

2. A high-gain switch panel according to claim 1, characterized in that: The short-circuit unit and the feed point unit are both conductive arms, and the short-circuit unit is bent from one end of the feed point unit to be perpendicular to the feed point unit and then to be parallel to the short-circuit unit.

3. A high-gain switch panel according to claim 2, characterized in that: The short-circuit unit and the feed point unit are printed antennas arranged on the PCB board.

4. A high-gain switch panel according to claim 2, characterized in that: The width of the short-circuit unit is 0.8-1.2 mm, and / or the width of the feed point unit is 0.8-1.2 mm.

5. A high-gain switch panel according to claim 1, characterized in that: The distance between the short-circuit unit and the feed point unit is 2-4 mm.

6. A high-gain switch panel according to claim 5, characterized in that: The short-circuit unit and the feed point unit are arranged in parallel.

7. A high-gain switch panel according to claim 1, characterized in that: The distance between the three-dimensional antenna and the PCB board is 4-6 mm, and / or the width of the three-dimensional antenna is 1.3-1.7 mm.

8. A high-gain switch panel according to any one of claims 1-7, characterized in that: The three-dimensional antenna is a steel sheet antenna, and the steel sheet antenna is welded or screwed to the feed point unit.

9. A high-gain switch panel according to any one of claims 1-7, characterized in that: The three-dimensional antenna is an FPC antenna, and the FPC antenna is connected to the feed point unit via a coaxial line.

10. The high-gain switch panel according to claim 1, characterized in that: It includes a tuning network, which is arranged between the feed point unit and the signal output end of the radio frequency chip.

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