CN115395216A

CN115395216A - Antenna device and ZigBee module

Info

Publication number: CN115395216A
Application number: CN202210907193.3A
Authority: CN
Inventors: 何彦; 刘宏伟; 王小虎
Original assignee: Shenzhen Feibit Electronic Technology Co ltd
Current assignee: Shenzhen Feibit Electronic Technology Co ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-11-25

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

Background

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

Disclosure of Invention

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

The embodiment of the invention achieves the above object by the following technical solutions.

In a first aspect, embodiments of the present invention provide an antenna apparatus. The antenna device includes 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 portion is connected to the first radiation portion, and the second radiation portion and the first radiation portion 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.

In some embodiments, the first radiating portion is provided with a first convex portion and a second convex portion protruding towards one side of the arc center of the arc line. The first convex part is connected to the feed source, and the second convex part is connected to the first sub-radiation part and forms a first gap with the first convex part relatively.

In some embodiments, the first protrusion and the second protrusion have a pitch of 1.4 to 3.1mm.

In some embodiments, the first sub radiating portion has an arc shape, and a wiring width of the first sub radiating portion is 1.4 to 1.5mm.

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

In some embodiments, the first radiating section has a wiring width in the direction of the arc of 0.9 to 1.1mm, and the second radiating section has a wiring width in the direction of the arc of 1.9 to 2.1mm.

In some embodiments, the first radiating section is routed along a radial direction of the arc for a length of 1.9 to 2.1mm. The wiring length of the second radiation section along the radial direction of the arc line is 2.9-3.1 mm.

In some embodiments, the feed and the first and second radiating portions are arranged in series along an arc.

In some embodiments, the feed source comprises a gold-plated layer having a length in the radial direction of the arc of 5.9 to 6.1mm. The width of the gold plating layer along the direction of the arc line is 2.9-3.1 mm.

The embodiment of the invention also provides a ZigBee module. The ZigBee module comprises a circuit board and the antenna device of any of the embodiments described above. The circuit board is provided with a first positioning hole. The antenna device is arranged on the circuit board. The first radiation part is provided with a second positioning hole which is coaxially arranged in the first positioning hole.

The embodiment of the invention provides an antenna device and a ZigBee module. The antenna device comprises a feed source and a radiator, wherein the feed source feeds a current signal into the radiator, so that the radiator works in a specified frequency band. The radiating body comprises a first radiating part and a second radiating part, the first radiating part is connected to the feed source, and the first radiating part is provided with a first gap, so that the frequency of the antenna device is reduced. The first radiation part is connected to the first radiation part, the second radiation part and the first radiation part are arranged along an arc line, one end, deviating from the second sub-radiation part, of the first sub-radiation part is connected to the first radiation part, the first radiation part and the second sub-radiation part form a second gap, the second gap and the first gap are located on two opposite sides of the radiation body, the second gap is located on one side, deviating from an arc center of the arc line, of the radiation body, the second sub-radiation part can work in a specified frequency band, the physical size of the antenna device is reduced, the antenna device has high antenna gain and good radiation efficiency, and performance of the antenna device is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an antenna device according to an embodiment of the present invention.

Fig. 2 is a schematic size diagram of an antenna device provided in an embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating a position of an antenna device provided in an embodiment of the present invention in a rectangular spatial coordinate system.

Fig. 4 shows a schematic diagram of the radiation direction of the antenna arrangement in fig. 3 at 2400 MHz.

Fig. 5 shows a schematic diagram of the H-plane radiation direction of the antenna device in fig. 4 at 2400 MHz.

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

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

Fig. 8 shows a schematic diagram of the radiation direction of the antenna arrangement in fig. 3 at 2450 MHz.

Fig. 9 shows a schematic diagram of the H-plane radiation direction of the antenna device in fig. 8 at 2450 MHz.

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

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

Fig. 12 shows a schematic diagram of the radiation direction of the antenna arrangement in fig. 3 at 2500 MHz.

Fig. 13 shows a schematic diagram of the H-plane radiation direction of the antenna arrangement in fig. 12 at 2500 MHz.

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

Fig. 15 is a schematic diagram showing the E2 plane radiation direction of the antenna device in fig. 12 at 2500 MHz.

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

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the attached drawings. It is to be understood that the described embodiments are merely exemplary of some, and not necessarily all, embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, belong to the protection scope of the present invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

ZigBee is a low-power local area network protocol based on IEEE802.15.4 standard, has the characteristics of low power consumption, low cost, low complexity, strong anti-interference capability, large network capacity and the like, and can support various network topological structures such as a mesh network, a star network, a tree network and the like. ZigBee uses three different working frequency bands, namely 2.4GHz, 868MHz and 433MHz, wherein 2.4GHz is the mainstream working frequency band of ZigBee.

In practical studies, the inventors of the present application found that the operating frequency, efficiency and antenna gain of the antenna radiation can be effectively adjusted by adjusting the wiring manner of the antenna device 10. Therefore, designing the wiring pitch and length of the antenna device 10 is an important factor in achieving improved antenna performance.

In view of this, the present invention provides an antenna device 10, and the antenna device 10 can be applied in a ZigBee module 20, and can be used for generating an operating frequency band of 2.4 GHz. In the following embodiments, the antenna device 10 is mainly applied to the ZigBee module 20 as an example, and other cases requiring the antenna device 10 may be referred to.

Referring to fig. 1, the antenna device 10 includes a feed source 100 and a radiator 200, where the feed source 100 may be used to electrically connect to a radio frequency circuit, so that the feed source 100 may feed a current signal to the radiator 200 to enable the radiator 200 to operate in a specified frequency band. Thus, the performance of the antenna device 10 can be improved by adjusting the positions of the feed source 100 and the radiator 200 and adjusting the shape of the radiator 200.

In this embodiment, the overall shape of the feed source 100 and the radiator 200 is approximately arc-shaped, so as to be beneficial to matching the working frequency band required by the ZigBee module 20, and enable the antenna device 10 to be routed along the edge of the ZigBee module 20, reduce the physical device of the antenna device 10, reduce the occupied space of the antenna device 10, facilitate receiving and transmitting signals, enable the antenna device 10 to have higher antenna gain and better radiation efficiency, and further improve the performance of the antenna device.

Referring to fig. 1 and fig. 2, the feed source 100 includes a gold-plated layer 101, and the gold-plated layer 101 can enhance the conductive property between the feed source 100 and the radiator 200, thereby being more resistant to oxidation, being less prone to air corrosion, and being beneficial to reducing signal interference and loss. In the present embodiment, the length of the gold-plated layer 101 along the radial direction of the arc line (the dashed line with an arrow in fig. 1) is L1, where L1 has a value in the range of 5.9 to 6.1mm, for example, L1 may be 6mm. The width of the gold-plating layer 101 along the direction of the arc line is L2, where L2 ranges from 2.9 to 3.1mm, for example, L2 may be 3mm. Thus, the area of the feed source 100 is small, the occupied space of the feed source 100 is reduced, and the feed source 100 can transmit electric signals to the radiator 200 conveniently.

The radiator 200 includes a first radiation part 210 and a second radiation part 220. First radiating part 210 is connected between feed 100 and second radiating part 220, for example, first radiating part 210 and second radiating part 220 can arrange along the direction of pitch arc for antenna device 10 can match and install in zigBee module 20, thereby makes antenna device 10 can match the operating frequency range (for example, 2.4 GHz's operating frequency range) of zigBee module 20 better, and then improves antenna device 10's performance.

The first radiation portion 210 is disposed in a shape of a concave shape in a substantially outline. The first radiation portion 210 has a first gap 201, the first gap 201 is disposed between the feed source 100 and the second radiation portion 220, which is beneficial to increasing the length of the routing of the first radiation portion 210 and reducing the wiring area of the first radiation portion 210, thereby reducing the occupied space of the antenna device 10, reducing the frequency of the antenna device 10, and further being beneficial to matching the antenna device 10 with a proper working frequency.

One side of the first radiating portion 210 facing the arc center of the arc may be provided with a first convex portion 211 and a second convex portion 212, the first convex portion 211 is connected to the feed 100, and the second convex portion 212 is connected to the second radiating portion 220 and is opposite to the first convex portion 211. The first gap 201 is formed between the first protrusion 211 and the second protrusion 212 at an interval, which is beneficial to increasing the length of the trace of the first radiation portion 210 and reducing the wiring area of the first radiation portion 210, thereby reducing the occupied space of the antenna device 10, reducing the frequency of the antenna device 10, and further being beneficial to matching the antenna device 10 with a proper working frequency. In this embodiment, a distance between the first protrusion 211 and the second protrusion 212 is L3, wherein a value range of L3 is 2.9-3.1 mm, for example, L3 may be 3mm, so as to facilitate the first protrusion 211 and the second protrusion 212 to adjust a routing manner of the first radiation portion 210, and further adjust an occupied space of the first radiation portion 210.

The second radiation part 220 includes a first sub-radiation part 221 and a second sub-radiation part 222 connected to each other, and one end of the first sub-radiation part 221, which is away from the second sub-radiation part 222, is connected to the first radiation part 210, so that the first radiation part 210 and the second radiation part 220 are arranged along an arc, which is beneficial for the antenna device 10 to route 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 radiation portion 210, the first sub-radiation portion 221 and the second sub-radiation portion 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 facing away from the arc center of the arc line. Thus, the existence of the first gap 201 and the second gap 202 is beneficial to the area of the radiator 200, increase the length of the trace, and reduce the frequency, thereby reducing the occupied space of the antenna device 10 and increasing the gain of the antenna device 10.

The first sub-radiation portion 221 is disposed in an arc shape, which is beneficial to arrange the first radiation portion 210 and the second radiation portion 220 along an arc, so that the feed source 100 and the radiator 200 are arranged along an arc. In the present embodiment, the wiring width of the first sub-radiation part 221 is L4, where L4 ranges from 1.4 mm to 1.6mm, for example, L4 may be 1.5mm. Thus, the antenna device 10 can be matched with a proper frequency, and the efficiency and the gain of the antenna device 10 can be improved.

The second radiation portion 220 includes a first radiation section 222a, one end of the first radiation section 222a is connected to one end of the first sub-radiation portion 221, which is far away from the first radiation portion 210, and the other end of the first radiation section 222a extends in a direction away from the first sub-radiation portion 221. The first radiation segment 222a has a wiring width L5 along the direction of the arc, where L5 has a value in a range of 0.9 to 1.1mm, for example, L5 may be 1mm. The first radiation segment 222a has a wiring length L6 along the radial direction of the arc line, where L6 has a value in a range of 1.9 to 2.1mm, for example, L6 may be 2mm. Thus, the antenna device 10 can be matched with a proper frequency, and the efficiency and the gain of the antenna device 10 can be improved.

The second radiation portion 220 further includes a second radiation section 222b, and the second radiation section 222b is connected to an end of the first radiation section 222a far from the first sub-radiation portion 221. The wiring width of the second radiation section 222b in the direction of the arc is larger than the wiring width of the first radiation section 222a in the direction of the arc. The second radiation segment 222b has a wiring width L7 along the direction of the arc, where L7 has a value in a range of 1.9 to 2.1mm, for example, L7 may be 2mm. The second radiation segment 222b has a wiring length L8 along the radial direction of the arc line, where L8 ranges from 2.9 to 3.1mm, for example, L8 may be 3mm. Thus, the antenna device 10 can be matched with a proper frequency, and the efficiency and the gain of the antenna device 10 can be improved.

Referring to table 1, in the antenna device 10 according to the above embodiment, the gains and efficiencies corresponding to different frequencies in practical tests are shown in table 1,

TABLE 1

From the test data in table 1, it can be seen that the gain is 3.0dB to 3.5dB and the radiation efficiency is 62.14% to 64.15% in the 2400 GHz band to 2500GHz band. Therefore, the radiation efficiency of the antenna device 10 according to the embodiment of the present application is higher than 62% when the antenna device 10 receives and transmits 2.4GHz band, and the gain and the radiation efficiency of the antenna device 10 are obviously higher.

Referring to table 2, table 2 shows the frequencies and standing wave ratios of the antenna device 10 of the above embodiment at a plurality of measurement points, which are obtained by the network analyzer test.

TABLE 2

Frequency (MHZ)	2400	2500
			Standing wave ratio	1.46	1.31

Most of the standing wave ratios currently applied to the on-board antenna device 10 of 2.4GHz are in the range of 1.5 to 1.6, and therefore the antenna device 10 of the embodiment of the present application has an advantage of low standing wave ratio.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating a position of a line device according to an embodiment of the present disclosure in a spatial rectangular coordinate system, where in the spatial rectangular coordinate system O-xyz, the antenna device 10 is located on an xOz coordinate plane, and an origin of coordinate axes is substantially located in a middle of the antenna device 10, so as to facilitate detection of the antenna device.

Referring to fig. 4 to 7, fig. 4 shows a radiation pattern of the antenna device 10 provided by the embodiment of the present application in a spatial rectangular coordinate system at 2400MHz, where a central point of the pattern represents a position of the antenna, and a farther distance from a midpoint indicates a larger gain, and a darker color indicates a larger gain of the antenna. Fig. 5 is a radiation pattern of an H plane (the H plane is a plane in which a magnetic field and a maximum radiation direction are located), fig. 6 is a radiation pattern of an E1 plane (the E plane is a plane in which a maximum radiation direction and an electric field are located), and fig. 7 is a radiation pattern of an E2 plane (the E plane is a plane in which a maximum radiation direction and an electric field are located). The radiation patterns shown in fig. 4 to 7 all extend in a certain direction, and the gain is high, that is, the gain and efficiency of the antenna device 10 are high on the plane where the antenna device 10 is located and the plane perpendicular to the antenna device 10, so that directional radiation can be realized, and the position of the antenna device 10 can be reasonably set according to actual requirements to improve the practicability.

Referring to fig. 8 to 11, fig. 8 shows a radiation pattern of the antenna device 10 provided by the embodiment of the present application in a rectangular spatial coordinate system at 2450MHz, where the center point of the graph represents the position of the antenna, and the farther from the midpoint indicates the greater the gain, and the darker the color indicates the greater the gain of the antenna. Fig. 9 shows a radiation pattern of an H plane (the H plane is a plane in which a magnetic field and a maximum radiation direction are located), fig. 10 shows a radiation pattern of an E1 plane (the E plane is a plane in which a maximum radiation direction and an electric field are located), and fig. 11 shows a radiation pattern of an E2 plane (the E plane is a plane in which a maximum radiation direction and an electric field are located). The radiation patterns shown in fig. 9 to 11 all extend in a certain direction, and the gain is high, that is, the gain and efficiency of the antenna device 10 are high on the plane where the antenna device 10 is located and the plane perpendicular to the antenna device 10, so that the directional radiation can be realized, and the position of the antenna device 10 can be reasonably set according to actual requirements to improve the practicability.

Referring to fig. 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 a spatial rectangular coordinate system, the central point of the graph represents the position of the antenna, and the farther from the midpoint represents the greater the gain, and the darker the color represents the greater the gain of the antenna. Fig. 13 is a radiation pattern of an H plane (H plane is a plane in which a magnetic field and a maximum radiation direction are located), fig. 14 is a radiation pattern of an E1 plane (E plane is a plane in which a maximum radiation direction and an electric field are located), and fig. 15 is a radiation pattern of an E2 plane (E plane is a plane in which a maximum radiation direction and an electric field are located). The radiation patterns shown in fig. 13 to 15 all extend in a certain direction, and the gain is high, that is, the gain and efficiency of the antenna device 10 are high on the plane where the antenna device 10 is located and the plane perpendicular to the antenna device 10, so that directional radiation can be realized, and the position of the antenna device 10 can be set reasonably according to actual requirements.

Referring to fig. 16, the present invention also provides a ZigBee module 20, wherein the ZigBee module 20 includes a circuit board 300 and the antenna device 10 according to the above embodiment. The specific structure of the antenna device 10 refers to the above-described embodiment. The ZigBee module 20 may be applied in a gateway device, for example. Since the ZigBee module 20 adopts all technical solutions of all embodiments described above, all beneficial effects brought by the technical solutions of the embodiments of the antenna device 10 are also achieved, and are not described in detail herein.

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 portion 210 is provided with a second positioning hole 302, and the second positioning hole 302 is disposed coaxially with the first positioning hole 301, so as to facilitate positioning of the ZigBee module 20 and further facilitate installation of the ZigBee module 20.

In the present invention, the terms "mounted," "connected," and the like are to be construed broadly unless otherwise explicitly specified or limited. For example, the connection can be fixed connection, detachable connection, integral connection or transmission connection; may be directly connected or indirectly connected through an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Furthermore, the terms "first," "second," and the like, are used solely to distinguish one from another and are not to be construed as referring to or particular 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 invention. In the present invention, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples and features of the various embodiments or examples described herein can be combined and combined by those skilled in the art without contradiction.

The above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. An antenna device, comprising:

a feed source; and

the irradiator, the irradiator includes first radiation portion and second radiation portion, first radiation portion connect in the feed, first radiation portion has first clearance, second radiation portion connect in first radiation portion, just second radiation portion with first radiation portion arranges along the pitch arc, second radiation portion is including the first sub-radiation portion and the sub-radiation portion of second that are connected, first sub-radiation portion deviates from the one end of the sub-radiation portion of second connect in first radiation portion, first radiation portion first sub-radiation portion with form the second clearance between the sub-radiation portion of second, the second clearance with first clearance is located the both sides that carry on the back of the body of irradiator, and the second clearance is located the irradiator deviates from one side of the arc center of pitch arc.

2. The antenna device according to claim 1, wherein the first radiation portion is provided with a first convex portion and a second convex portion protruding toward one side of an arc center of the arc, the first convex portion is connected to the feed source, and the second convex portion is connected to the first sub-radiation portion and forms the first gap opposite to the first convex portion.

3. The antenna device according to claim 2, wherein a pitch between the first convex portion and the second convex portion is 2.9 to 3.1mm.

4. The antenna device according to claim 1, wherein the first sub-radiating portion has an arc shape, and a wiring width of the first sub-radiating portion is 1.4 to 1.6mm.

5. The antenna device according to claim 4, wherein the second sub-radiation portion includes a first radiation section and a second radiation section, one end of the first radiation section is connected to an end of the first sub-radiation portion away from the first radiation section, the other end of the first radiation section is connected to the second radiation section, and a wiring width of the second radiation section in the direction of the arc line is larger than a wiring width of the first radiation section in the direction of the arc line.

6. The antenna device according to claim 5, wherein the first radiation section has a wiring width in the direction of the arc of 0.9 to 1.1mm, and the second radiation section has a wiring width in the direction of the arc of 1.9 to 2.1mm.

7. The antenna device according to claim 6, wherein the first radiating section has a wiring length of 1.9 to 2.1mm in the radial direction of the arc line, and the second radiating section has a wiring length of 2.9 to 3.1mm in the radial direction of the arc line.

8. The antenna device according to claim 1, wherein the feed and the first and second radiating portions are arranged in sequence along the arc.

9. The antenna device according to claim 8, wherein the feed source comprises a gold-plated layer, a length of the gold-plated layer in a radial direction of the arc line is 5.9 to 6.1mm, and a width of the gold-plated layer in the direction of the arc line is 2.9 to 3.1mm.

10. A ZigBee module, comprising:

the circuit board is provided with a first positioning hole;

the antenna device according to any one of claims 1 to 9, which is provided on the circuit board, wherein the first radiating portion is provided with a second positioning hole, and the second positioning hole is provided coaxially with the first positioning hole.