CN115395216A - Antenna device and ZigBee module - Google Patents

Abstract

The invention provides an antenna device and a ZigBee module. The antenna device comprises a feed source and a radiator. The radiator includes a first radiation portion and a second radiation portion. The first radiation part is connected to the feed source. The first radiating portion has a first gap. The second radiation part is connected to the first radiation part, and the second radiation part and the first radiation part are arranged along an arc line. The second radiation part comprises a first sub-radiation part and a second sub-radiation part which are connected. One end of the first sub-radiation part, which is deviated from the second sub-radiation part, is connected to the first radiation part, and a second gap is formed among the first radiation part, the first sub-radiation part and the second sub-radiation part. The second gap and the first gap are located on two opposite sides of the radiator, and the second gap is located on one side, away from the arc center of the arc line, of the radiator. Therefore, the antenna device can work in the designated frequency band, and has higher antenna gain and better radiation efficiency while reducing the physical size of the antenna device, thereby improving the performance of the antenna device.

Description

Antenna device and ZigBee module

technical field

The present invention relates to the technical field of antennas, in particular to an antenna device and a ZigBee module.

Background technique

With the development of wireless communication technology, ZigBee technology is widely accepted because of its characteristics of low power consumption, low cost and low complexity. However, the antenna devices in most current ZigBee modules have poor performance and cannot meet usage requirements.

Contents of the invention

Embodiments of the present invention provide an antenna device to improve at least one of the above problems.

Embodiments of the present invention achieve the above objects through the following technical solutions.

In a first aspect, an embodiment of the present invention provides an antenna device. The antenna device includes a feed source and a radiator. The radiator includes a first radiator and a second radiator. The first radiation part is connected to the feed source. The first radiating part has a first gap. The second radiating part is connected to the first radiating part, and the second radiating part and the first radiating part are arranged along an arc. The second radiating part includes a first sub-radiating part and a second sub-radiating part which are connected. An end of the first sub-radiating portion facing away from the second sub-radiating portion is connected to the first radiating portion, and a second gap is formed among the first radiating portion, the first sub-radiating portion, and the second sub-radiating portion. The second gap and the first gap are located on opposite sides of the radiator, and the second gap is located on a side of the radiator away from the arc center of the arc.

In some embodiments, the first radiating portion protrudes toward one side of the arc center of the arc with a first convex portion and a second convex portion. The first protruding part is connected to the feed source, the second protruding part is connected to the first sub-radiating part, and forms a first gap opposite to the first protruding part.

In some embodiments, the distance between the first protrusion and the second protrusion is 1.4-3.1 mm.

In some embodiments, the first sub-radiating portion is arc-shaped, and the wiring width of the first sub-radiating portion is 1.4-1.5 mm.

In some embodiments, the second sub-radiating portion includes a first radiating section and a second radiating section. One end of the first radiating section is connected to an end of the first sub-radiating section away from the first radiating section, and the other end of the first radiating section is connected to the second radiating section. The wiring width of the second radiating section along the direction of the arc is larger than the wiring width of the first radiating section along the direction of the arc.

In some embodiments, the wiring width of the first radiating section along the direction of the arc is 0.9-1.1 mm, and the wiring width of the second radiating section along the direction of the arc is 1.9-2.1 mm.

In some embodiments, the wiring length of the first radiating segment along the radial direction of the arc is 1.9-2.1 mm. The wiring length of the second radiating section along the radial direction of the arc is 2.9-3.1 mm.

In some embodiments, the feed source, the first radiating portion and the second radiating portion are arranged in sequence along an arc.

In some embodiments, the feed source includes a gold-plated layer, and the length of the gold-plated layer along the radial direction of the arc is 5.9-6.1 mm. The width of the gold-plated layer along the direction of the arc is 2.9-3.1mm.

The embodiment of the present invention also provides a ZigBee module. The ZigBee module includes a circuit board and the antenna device in any one of the above-mentioned implementation manners. The circuit board is provided with a first positioning hole. The antenna device is arranged on the circuit board. The first radiating part is provided with a second positioning hole, and the second positioning hole is coaxially arranged with the first positioning hole.

An antenna device and a ZigBee module provided in the embodiments of the present invention. The antenna device includes a feed source and a radiator, and the feed source feeds a current signal into the radiator so that the radiator works in a specified frequency band. Wherein, the radiator includes a first radiating part and a second radiating part, the first radiating part is connected to a feed source, and the first radiating part has a first gap, which is beneficial to reduce the frequency of the antenna device. The first radiating part is connected to the first radiating part, and the second radiating part and the first radiating part are arranged along an arc, and the end of the first sub-radiating part away from the second sub-radiating part is connected to the first radiating part, and the first radiating part Part, the first sub-radiating part and the second sub-radiating part form a second gap, the second gap and the first gap are located on opposite sides of the radiator, and the second gap is located at the center of the arc of the radiator away from the arc On one side, the second sub-radiating part can work in a specified frequency band, and while reducing the physical size of the antenna device, the antenna device has higher antenna gain and better radiation efficiency, thereby improving the performance of the antenna device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 shows a schematic structural diagram of an antenna device provided by an embodiment of the present invention.

Fig. 2 shows a schematic diagram of the size of the antenna device provided by the embodiment of the present invention.

Fig. 3 shows a schematic diagram of the position of the antenna device provided in the embodiment of the present invention in a spatial Cartesian coordinate system.

FIG. 4 shows a schematic diagram of the radiation direction of the antenna device in FIG. 3 at 2400 MHz.

FIG. 5 shows a schematic diagram of the radiation direction of the H surface of the antenna device in FIG. 4 at 2400 MHz.

FIG. 6 shows a schematic diagram of the radiation direction of the E1 plane of the antenna device in FIG. 4 at 2400 MHz.

FIG. 7 shows a schematic diagram of the radiation direction of the E2 plane of the antenna device in FIG. 4 at 2400 MHz.

FIG. 8 shows a schematic diagram of the radiation direction of the antenna device in FIG. 3 at 2450 MHz.

FIG. 9 shows a schematic diagram of the radiation direction of the H surface of the antenna device in FIG. 8 at 2450 MHz.

FIG. 10 shows a schematic diagram of the radiation direction of the E1 plane of the antenna device in FIG. 8 at 2450 MHz.

FIG. 11 shows a schematic diagram of the radiation direction of the E2 plane of the antenna device in FIG. 8 at 2450 MHz.

FIG. 12 shows a schematic diagram of the radiation direction of the antenna device in FIG. 3 at 2500 MHz.

FIG. 13 shows a schematic diagram of the radiation direction of the H surface of the antenna device in FIG. 12 at 2500 MHz.

FIG. 14 shows a schematic diagram of the radiation direction of the E1 plane of the antenna device in FIG. 12 at 2500 MHz.

FIG. 15 shows a schematic diagram of the radiation direction of the E2 plane of the antenna device in FIG. 12 at 2500 MHz.

Fig. 16 shows a schematic structural diagram of a ZigBee module provided by an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on the implementation manners in the present invention, all other implementation manners obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

ZigBee is a low-power LAN protocol based on the IEEE802.15.4 standard. It has the characteristics of low power consumption, low cost, low complexity, strong anti-interference ability, and large network capacity. It can support mesh networks, star networks, and tree networks. Shaped network and other network topologies. ZigBee uses three different working frequency bands, namely 2.4GHz, 868MHz, and 433MHz, among which 2.4GHz is the mainstream working frequency band of ZigBee.

In actual research, the inventors of the present application have found that the operating frequency, efficiency and antenna gain of the antenna radiation can be effectively adjusted by adjusting the wiring mode of the antenna device 10 . Therefore, designing the wiring pitch and length of the antenna device 10 is an important factor for improving the performance of the antenna.

In view of this, the present invention proposes an antenna device 10 that can be applied to a ZigBee module 20 and can be used to generate a working frequency band of 2.4 GHz. In the following embodiments, the application of the antenna device 10 in the ZigBee module 20 is mainly used as an example for description and introduction, and other cases where the antenna device 10 is required can be referred to for implementation.

Referring to Fig. 1, the antenna device 10 includes a feed source 100 and a radiator 200, the feed source 100 can be used to be electrically connected with a radio frequency circuit, so that the feed source 100 can feed a current signal to the radiator 200 to make the radiator 200 work at a specified band. In this way, the performance of the antenna device 10 can be improved by adjusting the positions of the feed source 100 and the radiator 200 and the shape of the radiator 200 .

In this embodiment, the overall properties of the feed source 100 and the radiator 200 are arranged in an arc shape, which is conducive to matching the working frequency band required by the ZigBee module 20, and enables the antenna device 10 to be routed along the edge of the ZigBee module 20 , the physical device of the antenna device 10 is reduced, the occupied space of the antenna device 10 is reduced, and it is convenient to receive and transmit signals, so that the antenna device 10 has higher antenna gain and better radiation efficiency, thereby improving the performance of the antenna device.

Please refer to FIG. 1 and FIG. 2 together. The feed source 100 includes a gold-plated layer 101. The gold-plated layer 101 can enhance the conduction characteristics between the feed source 100 and the radiator 200, which is conducive to better oxidation resistance and is not easily corroded by air. It is also beneficial to reduce signal interference and loss. In this implementation, the length of the gold-plated layer 101 in the radial direction along the arc (the dotted line with an arrow in FIG. 1 ) is L1, wherein the value range of L1 is 5.9-6.1mm, for example, L1 can be 6mm . The width of the gold-plated layer 101 along the direction of the arc is L2, wherein the value range of L2 is 2.9-3.1 mm, for example, L2 may be 3 mm. In this way, the area of the feed source 100 is small, which reduces the occupied space of the feed source 100 and facilitates the feed source 100 to transmit electrical signals to the radiator 200 .

The radiator 200 includes a first radiator 210 and a second radiator 220 . The first radiating part 210 is connected between the feed source 100 and the second radiating part 220, for example, the first radiating part 210 and the second radiating part 220 can be arranged along the direction of the arc, so that the antenna device 10 can be matched and installed on The ZigBee module 20 enables the antenna device 10 to better match the working frequency band of the ZigBee module 20 (for example, the working frequency band of 2.4 GHz), thereby improving the performance of the antenna device 10 .

The outline of the first radiating portion 210 is roughly set in a concave shape. The first radiating part 210 has a first gap 201, and the first gap 201 is provided between the feed source 100 and the second radiating part 220, which is beneficial to increase the length of the wiring of the first radiating part 210 and reduce the length of the first radiating part. 210, thereby reducing the occupied space of the antenna device 10 and lowering the frequency of the antenna device 10, which in turn facilitates matching a suitable working frequency for the antenna device 10.

The first radiating part 210 can be provided with a first convex part 211 and a second convex part 212 on the side facing the arc center of the arc, the first convex part 211 is connected to the feed source 100, and the second convex part 212 is connected to the second radiating part part 220 and is opposite to the first convex part 211. The first protruding part 211 and the second protruding part 212 form the above-mentioned first gap 201 at intervals, which is beneficial to increase the length of the wiring of the first radiating part 210 and reduce the wiring area of the first radiating part 210, thereby reducing The occupied space of the antenna device 10 is reduced, and the frequency of the antenna device 10 is reduced, which is beneficial to matching a suitable working frequency for the antenna device 10 . In this embodiment, the distance between the first convex portion 211 and the second convex portion 212 is L3, wherein the value range of L3 is 2.9-3.1 mm, for example, L3 may be 3 mm, which is beneficial for the first convex The portion 211 and the second convex portion 212 adjust the routing of the first radiating portion 210 , thereby adjusting the occupied space of the first radiating portion 210 .

The second radiating part 220 includes a connected first sub-radiating part 221 and a second sub-radiating part 222, and the end of the first sub-radiating part 221 away from the second sub-radiating part 222 is connected to the first radiating part 210, so that the first sub-radiating part 221 The radiating part 210 and the second radiating part 220 are arranged along an arc, which is convenient for the antenna device 10 to be routed in the ZigBee module 20 and is easy to match a suitable working frequency for the antenna.

Further, a second gap 202 is formed among the first radiating part 210, the first sub-radiating part 221 and the second sub-radiating part 222, the second gap 202 and the first gap 201 are located on opposite sides of the radiator 200, and The second gap 202 is located on a side of the radiator 200 away from the arc center of the arc. In this way, the existence of the first gap 201 and the second gap 202 is beneficial to the area of the radiator 200 , increases the length of the wiring, and reduces the frequency, thereby reducing the occupied space of the antenna device 10 and increasing the gain of the antenna device 10 .

The first sub-radiating part 221 is arranged in an arc shape, which is beneficial to arrange the first radiating part 210 and the second radiating part 220 along the arc, so that the feed source 100 and the radiator 200 are arranged along the arc. In this embodiment, the wiring width of the first sub-radiating part 221 is L4, wherein the value range of L4 is 1.4-1.6 mm, for example, L4 may be 1.5 mm. In this way, it is beneficial for the antenna device 10 to match a suitable frequency and improve the efficiency and gain of the antenna device 10 .

The second radiating part 220 includes a first radiating section 222a, one end of the first radiating section 222a is connected to the end of the first sub-radiating part 221 away from the first radiating part 210, and the other end of the first radiating section 222a faces away from the first sub-radiating part. The direction of the radiation part 221 extends. The wiring width of the first radiating segment 222a along the direction of the arc is L5, wherein the value range of L5 is 0.9-1.1 mm, for example, L5 may be 1 mm. The wiring length of the first radiating segment 222a along the radial direction of the arc is L6, wherein the value range of L6 is 1.9-2.1 mm, for example, L6 may be 2 mm. In this way, it is beneficial for the antenna device 10 to match a suitable frequency and improve the efficiency and gain of the antenna device 10 .

The second radiating portion 220 further includes a second radiating section 222b connected to an end of the first radiating section 222a away from the first sub-radiating section 221 . The wiring width of the second radiating segment 222b along the direction of the arc is larger than the wiring width of the first radiating segment 222a along the direction of the arc. The wiring width of the second radiating section 222b along the direction of the arc is L7, wherein the value range of L7 is 1.9-2.1 mm, for example, L7 may be 2 mm. The wiring length of the second radiating segment 222b along the radial direction of the arc is L8, wherein the value range of L8 is 2.9-3.1 mm, for example, L8 may be 3 mm. In this way, it is beneficial for the antenna device 10 to match a suitable frequency and improve the efficiency and gain of the antenna device 10 .

Please refer to Table 1. According to the antenna device 10 of the above-mentioned embodiment, the gains and efficiencies corresponding to different frequencies in actual tests are shown in Table 1.

Table 1

It can be known from the test data in Table 1 that, in the 2400 to 2500 GHz frequency band, the gain is between 3.0 dB and 3.5 dB, and the radiation efficiency is between 62.14% and 64.15%. Therefore, the radiation efficiency of the antenna device 10 in the embodiment of the present application is higher than 62% when transmitting and receiving the 2.4 GHz frequency band, and the gain and radiation efficiency of the antenna device 10 are obviously higher.

Please refer to Table 2. Table 2 shows the frequencies and standing wave ratio values of the antenna device 10 of the above embodiment at multiple measurement points obtained by testing with a network analyzer.

Table 2

Frequency (MHZ) 2400 2500 VSWR 1.46 1.31

At present, the standing wave ratio of most on-board antenna devices 10 applied to 2.4GHz is in the range of 1.5 to 1.6, so the antenna device 10 of the embodiment of the present application has the advantage of low standing wave ratio.

Please refer to Fig. 3. Fig. 3 shows a schematic diagram of the position of a wire device provided by the embodiment of the present application in the space rectangular coordinate system. In the space rectangular coordinate system O-xyz, the antenna device 10 is located on the xOz coordinate plane, and the coordinate axis The origin is roughly set in the middle of the antenna device 10, so as to facilitate detection of the antenna device.

Please refer to FIG. 4 to FIG. 7. FIG. 4 shows the radiation pattern of the antenna device 10 provided by the embodiment of the present application at 2400MHz in the space Cartesian coordinate system. The center point of the graph represents the position of the antenna, and the farther away from the neutral point is the gain. The larger and the darker the color, the greater the gain of the antenna. Among them, Figure 5 is the radiation pattern of the H plane (the H plane is the plane where the magnetic field and the maximum radiation direction are located), Figure 6 is the radiation pattern of the E1 plane (the E plane is the plane where the maximum radiation direction and the electric field are located), and Figure 7 It is the radiation pattern of the E2 plane (the E plane is the plane where the radiation maximum direction and the electric field are located). The radiation patterns shown in FIGS. 4 to 7 all extend along a certain direction, and the gain is relatively high, that is, on the plane where the antenna device 10 is located and the plane perpendicular to the antenna device 10, the gain of the antenna device 10 and the The efficiency is high, and directional radiation can be realized, so that the position of the antenna device 10 can be reasonably set according to actual requirements to improve practicability.

Please refer to FIG. 8 to FIG. 11. FIG. 8 shows the radiation pattern of the antenna device 10 provided by the embodiment of the present application at 2450MHz in the space Cartesian coordinate system. The center point of the graph represents the position of the antenna, and the farther away from the neutral point represents the gain. The larger and the darker the color, the greater the gain of the antenna. Among them, Figure 9 is the radiation pattern of the H plane (the H plane is the plane where the magnetic field and the maximum radiation direction are located), Figure 10 is the radiation pattern of the E1 plane (the E plane is the plane where the maximum radiation direction and the electric field are located), and Figure 11 It is the radiation pattern of the E2 plane (the E plane is the plane where the radiation maximum direction and the electric field are located). The radiation patterns shown in FIGS. 9 to 11 all extend along a certain direction, and the gain is relatively high, that is, on the plane where the antenna device 10 is located and the plane where the antenna device 10 is located, the gain of the antenna device 10 and the plane where the antenna device 10 is located are The efficiency is high, and directional radiation can be realized, so that the position of the antenna device 10 can be reasonably set according to actual requirements to improve practicability.

Please refer to FIGS. 12 to 15. FIG. 12 shows the radiation pattern of the antenna device 10 provided by the embodiment of the present application at 2500MHz in the space Cartesian coordinate system. The center point of the graph represents the position of the antenna, and the farther away from the neutral point is the gain. The larger and the darker the color, the greater the gain of the antenna. Among them, Figure 13 is the radiation pattern of the H plane (the H plane is the plane where the magnetic field and the maximum radiation direction are located), Figure 14 is the radiation pattern of the E1 plane (the E plane is the plane where the maximum radiation direction and the electric field are located), and Figure 15 It is the radiation pattern of the E2 plane (the E plane is the plane where the radiation maximum direction and the electric field are located). The radiation patterns shown in Fig. 13 to Fig. 15 all extend along a certain direction, and the gain is relatively high, that is to say, on the plane where the antenna device 10 is located and the plane perpendicular to the antenna device 10, the gain of the antenna device 10 and the The efficiency is high, directional radiation can be realized, and the position of the antenna device 10 can be reasonably set according to actual requirements.

Referring to FIG. 16 , the present invention also proposes a ZigBee module 20 , and the ZigBee module 20 includes a circuit board 300 and the antenna device 10 mentioned in the above embodiments. For the specific structure of the antenna device 10, refer to the above-mentioned embodiments. The ZigBee module 20 can be applied in a gateway device, for example. Since the ZigBee module 20 adopts all the technical solutions of the above-mentioned embodiments, it also has all the beneficial effects brought by the technical solutions of the embodiments of the antenna device 10 above, which will not be repeated here.

In some embodiments, the circuit board 300 is provided with a first positioning hole 301, the antenna device 10 is disposed on the circuit board 300, the first radiating part 210 is provided with a second positioning hole 302, and the second positioning hole 302 is connected to the first positioning hole 301. The coaxial arrangement facilitates the positioning of the ZigBee module 20 and facilitates the installation of the ZigBee module 20 .

In the present invention, terms such as "installation" and "connection" should be interpreted in a broad sense unless otherwise specified or limited. For example, it may be a fixed connection, a detachable connection, an integral connection, or a transmission connection; it may be a direct connection or an indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the terms "first", "second" and the like are only used for distinguishing descriptions, and should not be interpreted as specific or special structures. The description of the term "some embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in the present invention without conflicting with each other.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications to the technical solutions recorded, or equivalent replacement of some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and shall be included in the scope of the technical solutions of the present invention. within the scope of protection.

Claims (10)

1. An antenna device, characterized in that, comprising: feed; and Radiator, the radiator includes a first radiation part and a second radiation part, the first radiation part is connected to the feed source, the first radiation part has a first gap, and the second radiation part is connected to The first radiating part, the second radiating part and the first radiating part are arranged along an arc, the second radiating part includes a first sub-radiating part and a second sub-radiating part connected, so The end of the first sub-radiating part facing away from the second sub-radiating part is connected to the first radiating part, and the first radiating part, the first sub-radiating part and the second sub-radiating part form a The second gap, the second gap and the first gap are located on opposite sides of the radiator, and the second gap is located on a side of the radiator away from the arc center of the arc. 2. The antenna device according to claim 1, wherein the first radiating portion is provided with a first convex portion and a second convex portion protruding toward one side of the arc center of the arc, the first The protruding part is connected to the feed source, the second protruding part is connected to the first sub-radiating part, and forms the first gap opposite to the first protruding part. 3 . The antenna device according to claim 2 , wherein a distance between the first convex portion and the second convex portion is 2.9-3.1 mm. 4 . 4 . The antenna device according to claim 1 , wherein the first sub-radiating portion is arc-shaped, and the wiring width of the first sub-radiating portion is 1.4-1.6 mm. 5. The antenna device according to claim 4, wherein the second sub-radiating section comprises a first radiating section and a second radiating section, one end of the first radiating section is connected to the first sub-radiating section One end of the first radiating portion away from the first radiating portion, the other end of the first radiating portion is connected to the second radiating section, and the wiring width of the second radiating section along the direction of the arc is larger than that of the first radiating section The wiring width of a radiating segment along the direction of the arc. 6. The antenna device according to claim 5, characterized in that, the wiring width of the first radiating section along the direction of the arc is 0.9-1.1 mm, and the wiring width of the second radiating section along the arc is 0.9-1.1 mm. The wiring width in the direction is 1.9 to 2.1 mm. 7. The antenna device according to claim 6, characterized in that, the wiring length of the first radiating section along the radial direction of the arc is 1.9-2.1mm, and the wiring length of the second radiating section along the arc The wiring length in the radial direction of the wire is 2.9 to 3.1 mm. 8 . The antenna device according to claim 1 , wherein the feed source, the first radiating portion, and the second radiating portion are sequentially arranged along the arc. 9. The antenna device according to claim 8, wherein the feed source comprises a gold-plated layer, the length of the gold-plated layer along the radial direction of the arc is 5.9-6.1 mm, and the gold-plated layer The width along the direction of the arc is 2.9-3.1 mm. 10. A ZigBee module, characterized in that, comprising: A circuit board, the circuit board is provided with a first positioning hole; The antenna device according to any one of claims 1 to 9, wherein the antenna device is arranged on the circuit board, the first radiating part is provided with a second positioning hole, and the second positioning hole is connected to the first positioning hole. A positioning hole is arranged coaxially.

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