CN218498374U

CN218498374U - Serial port gateway antenna

Info

Publication number: CN218498374U
Application number: CN202222322826.2U
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: 2022-09-01
Filing date: 2022-09-01
Publication date: 2023-02-17
Anticipated expiration: 2032-09-01

Abstract

The application provides a serial ports gateway antenna, includes: circuit board, signal line. The metal radiating body is arranged on the circuit board and comprises a first branch knot, a second branch knot and a third branch knot, two ends of the third branch knot bend towards the same side to form a first bent part and a second bent part, one end of the first branch knot is connected to the first bent part, one end of the second branch knot is connected to the second bent part, a first gap is formed between the other end of the first branch knot and the other end of the second branch knot, the first branch knot is provided with a feed point, and the second branch knot is provided with a feed point; one end of the signal wire passes through the first gap and is electrically connected with the feed point and the feed point, and the other end of the signal wire is provided with a connecting terminal. The serial port gateway antenna that this application provided, the antenna that sets up in the serial port gateway antenna can realize the omnidirectional radiation when the adaptation serial port gateway, has higher antenna gain and better radiating efficiency.

Description

Serial port gateway antenna

Technical Field

The application relates to the technical field of antennas, in particular to a serial port gateway antenna.

Background

The Gateway (Gateway) is also called an internetwork connector and a protocol converter. The gateway realizes network interconnection above a network layer, is a complex network interconnection device and is only used for interconnection of two networks with different high-level protocols. The gateway can be used for interconnection of both wide area networks and local area networks. A gateway is a computer system or device that acts as a switch-heavy task. A gateway is a translator used between two systems that differ in communication protocol, data format or language, and even in an entirely different architecture.

At present, the Korean serial port gateway adopts a ZigBee protocol, belongs to newly developed equipment, and does not have an antenna matched with the Korean serial port gateway at present, so that the use of the Korean serial port gateway is possibly limited.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a serial port gateway antenna to improve the technical problem.

The embodiment of the application provides a serial gateway antenna, which is suitable for a Korean serial gateway and comprises: circuit board and signal line. The metal radiator arranged on the circuit board comprises a first branch, a second branch and a third branch, the two ends of the third branch are bent towards the same side to form a first bent part and a second bent part, one end of the first branch is connected to the first bent part, one end of the second branch is connected to the second bent part, a first gap is formed between the other end of the first branch and the other end of the second branch, the first branch is provided with a feed point, and the second branch is provided with a feed point. One end of the signal wire penetrates through the first gap and is electrically connected with the feed point and the feed point, and the other end of the signal wire is provided with a connecting terminal.

In some embodiments, the metal radiator further includes a fourth branch and a fifth branch, the fourth branch is connected to an end of the first branch close to the second branch, and the fifth branch is connected to an end of the second branch close to the first branch.

In some embodiments, the feed point is disposed at an end of the first branch near the second branch, and the feed point is disposed at an end of the second branch near the first branch.

In some embodiments, the first branch and the third branch are disposed opposite to each other, the second branch and the third branch are disposed opposite to each other, and the first branch and the second branch are located on the same side of the third branch.

In some embodiments, the first and second branches are arranged co-linearly.

In some embodiments, the signal line is disposed obliquely with respect to the first gap.

In some embodiments, the signal line includes a first core and a second core electrically isolated from each other, the first core connecting the feed point and the second core connecting the feed point.

In some embodiments, the terminal is provided with a transmission terminal and a ground terminal; the transmission terminal is connected with the first core layer, and the grounding terminal is connected with the second core layer.

In some embodiments, the length of the circuit board is 39.01mm-39.51mm and the width of the circuit board is 8.95mm-9.45mm.

In some embodiments, the antenna is a ZigBee antenna.

The antenna provided by the embodiment of the application is connected with the Korean serial port gateway through the terminal of the signal wire, and then realizes the radiation of the Korean serial port gateway to other equipment through the radiation part arranged on the main body part. The antenna has higher antenna gain and better radiation efficiency while being adapted to a Korean serial port gateway of a new device.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be 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 application, 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 a serial gateway antenna according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a circuit board according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a signal line according to an embodiment of the present application;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 6 is a planar radiation pattern of the serial gateway antenna in this embodiment at 2400MHz frequency;

fig. 7 is a planar radiation pattern of the serial gateway antenna of this embodiment at 2450MHz frequency;

fig. 8 is a plane radiation pattern of the serial gateway antenna of this embodiment at a frequency of 2500 MHz.

Detailed Description

In order to make the technical solution better understood by those skilled in the art, the technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.

In this application, the terms "mounted," "connected," "secured," and the like are to be construed broadly unless otherwise specifically stated or limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, or they may be connected only by surface contact or through surface contact of an intermediate medium. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

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 terms "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the application. In this application, the schematic representations of the terms used above are not necessarily intended to refer 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 in this application can be combined and combined by those skilled in the art without conflicting.

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.

The serial port gateway is a network interconnection device which realizes network interconnection above a network layer and is a complex network interconnection device, and is only used for interconnection of two networks with different high-level protocols. The serial port gateway can be used for interconnection of a wide area network and can also be used for interconnection of a local area network. A serial gateway is a computer system or device that acts as a switch-operative.

At present, a Korean serial port gateway adopts a ZigBee protocol, belongs to newly developed equipment, and does not have an adaptive antenna. Therefore, the serial gateway antenna is provided to solve the above problems.

Examples

In this embodiment, please refer to fig. 1, the serial gateway communicates with other devices based on the ZigBee protocol, and a communication signal is radiated through the serial gateway antenna 10. Specifically, the serial gateway antenna 10 includes a circuit board 11 and a signal line 12, where one end of the signal line 12 is connected to the circuit board 11 and the other end is connected to the serial gateway.

In some embodiments, the serial gateway antenna 10 is disposed inside the serial gateway. Serial port gateway antenna 10 should not be oversize, and oversize will reduce the space of the inside other components of serial port gateway greatly, and preferably, antenna serial port gateway can set up in serial port gateway's shell lateral wall or shell top, and the setting adjacent to the shell will reduce the interference of internal component current circuit to the signal, and can follow better radiation signal. And because the metal body contains a large amount of free electrons, the conductivity is high, so that the loss of the refracted wave part of the electromagnetic wave is high, the reflection is also increased, and the electromagnetic wave is difficult to penetrate through the metal body. Preferably, the housing of the serial gateway is made of plastic, such as pvc, and the housing is not made of metal. In some other embodiments, serial gateway antenna 10 may also be disposed outside the serial gateway, so as to prevent the internal circuit of the serial gateway from interfering serial gateway antenna 10, and the disposition of terminal 121 may also facilitate replacement of serial gateway antenna 10.

In the present embodiment, the printed circuit board 11 is a printed circuit board made of a polyimide or polyester film as a base material, and a flexible printed circuit board with high reliability is called a flexible printed circuit board. The flexible design can make circuit board 11 laminate serial ports gateway's shell, reduces circuit board 11's usage space. As an implementation manner, the structure of the metal radiator 13 of the above embodiment may be adjusted according to the material of the circuit board 11, so that the antenna performance may be better for different circuit boards 11.

In some other embodiments, the circuit board 11 is an FR-4 board (epoxy glass cloth laminate). The FR-4 material has the advantages of low cost, mature multi-layer pressing board process and the like, is the most widely applied material in PCB (printed circuit board) board-mounted antennas, and the glass transition Temperature (TG) of the general FR-4 material is 130 ℃, namely the highest temperature for keeping rigidity of the material. For application scenarios with higher requirements on heat resistance, the circuit board 11 may also be made of a high TG ("TG" is the temperature point at which the material starts to change from a solid state to a rubbery state), i.e. a material with a glass transition temperature greater than 170 ℃.

The circuit board 11 is provided with a metal radiator 13, and since the radiation signal is radiated through the metal radiator 13, a protection measure of the metal radiator 13 is particularly important. The surface of the metal radiator 13 needs to be provided with a protective layer, which is used to prevent the surface of the metal radiator 13 from being oxidized and corroded on the one hand, and to prevent the internal structure of the metal radiator 13 from being damaged on the other hand, and is generally made of wear-resistant and oxidation-resistant materials, such as epoxy modified resin. Preferably, the serial gateway may be placed indoors, and the antenna 11 should not use toxic materials.

Referring to fig. 1 and 2, the metal radiator 13 includes a first branch 131, a second branch 132, and a third branch 133, and the third branch 133 connects the first branch 131 and the second branch 132. In some other embodiments, the metal radiator 13 is directly made of rectangular metal sheet, and the simple structure is not easy to damage, and preferably, the size needs to be adjusted according to the radiation signal parameters.

The two ends of the third branch 133 are bent toward the same side to form a first bent portion 133a and a second bent portion 133b, one end of the first branch 131 is connected to the first bent portion 133a, one end of the second branch 132 is connected to the second bent portion 133b, and a first gap 14 is formed between the other end of the first branch 131 and the other end of the second branch 132. Because the third branch 133 is bent, the third branch 133 has a larger size in a smaller space, so that the electrical length of the antenna is further increased, and the signal radiation effect is improved. The first gap 14 is provided to separate the first and

second branches

131 and 132 without interfering with each other. In some other embodiments, both ends of the third branch 133 may also be bent toward opposite directions, and lengths of the first branch 131 and the second branch 132 may be increased, where specific parameters may be adjusted according to implementation requirements, and this embodiment is not limited in this embodiment.

In this embodiment, first branch 131 is provided with a feed point 1311 and second branch 132 is provided with a feed point 1321. One end of the signal line 12 passes through the first gap 14 and electrically connects the feeding point 1311 and the feeding point 1321, and the other end of the signal line 12 is provided with a connection terminal 121. The feed 1311 is arranged to optimize the efficiency of the antenna and to improve the radiation and reception of the signal transmission. And the feeding point 1321 is arranged to lead out the signal, i.e. the point where the signal is transmitted. One end of the signal line 12 is connected to and electrically connected to the feeding point 1321 and the feeding point 1311 to form an antenna loop, and specifically, a signal is fed from the feeding point 1321 to the metal radiator 13, along the second branch 132, the third branch 133, and the first branch 131, and then returns to the ground at the feeding point 1311 to form a loop. The terminals 121 may connect the control circuit with the circuit board 11 and form a loop.

In this embodiment, the metal radiator 13 further includes a fourth branch 134 and a fifth branch 135, the fourth branch 134 is connected to one end of the first branch 131 close to the second branch 132, and the fifth branch 135 is connected to one end of the second branch 132 close to the first branch 131. When the serial gateway antenna 10 works, the fourth branch 134 and the fifth branch 135 are arranged to excite a current, so as to improve the effect of signal radiation and play an auxiliary role.

The first branch 131 and the third branch 133 are arranged oppositely, the second branch 132 and the third branch 133 are arranged oppositely, the first branch 131 and the second branch 132 are located on the same side of the third branch 133 as the 133, and the first branch 131 and the second branch 132 are arranged in a collinear manner. The antenna is smaller in size due to the arrangement of the same side, and the using space of the antenna is reduced. In some other embodiments, the first branch 131 and the second branch 132 may be respectively located at two sides of the third branch 133, so as to reduce mutual interference between the first branch 131 and the second branch 132. And first branch 131 and second branch 132 also can not the collineation setting, can be certain angle, increases the distance between the one end that third branch 133 was kept away from to first branch 131 and the one end that third branch 133 was kept away from to second branch 132, reduces mutual interference.

The signal line 12 is disposed obliquely with respect to the first gap 14, the oblique disposition may separate the feeding point 1321 from the feeding point 1311 as far as possible, and prevent the feeding point 1311 from being interfered by the feeding point 1321, or the oblique disposition may make the terminal 121 and the circuit board 11 non-collinear, and it is not necessary for the connection of the control circuit and the circuit board 11 to be located at the same horizontal line during installation, for example, the circuit board 11 is disposed on a side wall of a serial gateway, the control circuit of the gateway is not necessary to be located at the same horizontal line with the circuit board 11, and the signal line 12 may connect the control circuit and the circuit board 11 at an angle. In some other embodiments, the signal line 12 is disposed in parallel with respect to the first gap 14, so as to prevent the signal line 12 from being affected by an external force, and the connection between the signal line 12 and the circuit board 11 is deformed; the signal line 12 and the circuit board 11 can be arranged in parallel, and the use space of the serial gateway antenna 10 is reduced.

In the present embodiment, referring to fig. 1, fig. 3 and fig. 4 together, the signal line 12 includes a first core 122 and a second core 123 electrically insulated from each other, the first core 122 is connected to the feeding point 1321, and the second core 123 is connected to the feeding point 1311. The arrangement of the first core layer 122 and the second core layer 123 of the signal line 12, the first core layer 122 is used for transmitting signals; the second core layer 123 is generally used for grounding, and may serve as a shielding layer, so as to conduct a low level through a transmission loop, and prevent multiple lines from interfering with the serial gateway antenna 10. Under the shielding protection of the second core layer 123, the signal in the first core layer 122 has substantially no radiation loss, and is not interfered by external signals.

The signal line 12 further includes a first insulating layer 124 and a second insulating layer 125, the first insulating layer 124 is located between the first core layer 122 and the second core layer 123 and covers the first core layer 122, and the second insulating layer 125 covers the second core layer 123. The first insulating layer 124 can prevent the first core layer 122 and the second core layer 123 from being connected to each other, and prevent the first core layer and the second core layer from interfering with each other and disturbing signal radiation. The second insulating layer 125 can prevent the second core layer 123 from being damaged by the signal line 12 in a severe environment.

In the present embodiment, referring to fig. 4 and fig. 5, the terminal 121 has a transmission terminal 121a and a ground terminal 121b; the transmission terminal 121a is connected to the first core layer 122, and the ground terminal 121b is connected to the second core layer 123. The terminal 121 is provided with a transmission terminal 121a for connecting the first core layer 122 and a signal transmission port of the control circuit, and can radiate a signal from the control circuit to the antenna or the antenna radiates into the control circuit. The ground terminal 121b is used to connect the second core 123 and the ground feed point 1311 of the control circuit, and may transmit the low level of the loop and form a shielding protection for the first core 122. In some embodiments, the terminal 121 may be an ipex terminal, and the field pattern of the ipex terminal is better controllable, low in insertion loss, good in signal directional directivity, high in efficiency, and strong in interference resistance. Preferably, an ipex terminal with a corresponding size can be selected according to different calibers and heights, such as an ipex third-generation terminal, an ipex fourth-generation terminal and the like.

In the present embodiment, referring to fig. 1 and fig. 2 together, the length of the circuit board 11 is 39.01mm-39.51mm, and the width of the circuit board 11 is 8.95mm-9.45mm, because the impedance of the antenna with the length less than the multiple of 1/4 wavelength is capacitive, the antenna does not generate resonance, so when the length of the antenna is 1/4 of the wavelength of the radio signal, the conversion efficiency of transmitting and receiving of the antenna is high. Preferably, on the premise that the length of the antenna is 1/4 of the wavelength, a smaller design can be adopted to occupy less use space; specifically, the width of the fourth branch 134 is 4.26mm to 4.56mm, and the length of the fifth branch 135 is 14.85mm to 15.15mm. The specific parameters may be adjusted according to implementation requirements, and are not limited in this embodiment.

The serial gateway antenna 10 is a ZigBee antenna, and because the serial gateway is connected to other devices based on the ZigBee protocol, the serial gateway antenna 10 is a matching ZigBee antenna. In some other embodiments, the antenna may be adjusted according to different usage scenarios and objects, and may be a WiFi antenna, a BLE antenna, or the like.

In an actual test, a network analyzer is used to test the serial gateway antenna 10, please refer to table 1, where table 1 shows the frequency and standing wave ratio of a radiator at each measurement point in the serial gateway antenna 10 according to the embodiment obtained through the test of the network analyzer;

TABLE 1 standing-wave ratio of antenna at 2.4Ghz-2.5Ghz frequency band

Referring to table 2, in the serial gateway antenna 10 according to the embodiment, gains and efficiencies corresponding to different frequencies in an actual test are shown in table 2;

TABLE 2.4GHz-2.5GHz band antenna gain and efficiency

From the data in table 2, it can be seen that the gain is between 1.14dB and 1.4dB and the radiation efficiency is between 72.46% and 76.83% in the 2400 GHz band and 2500GHz band. Therefore, the radiation efficiency of the serial gateway antenna 10 in the embodiment of the present application is higher than 70% when receiving and transmitting 2.4GHz band, and the radiation efficiency is significantly higher.

Referring to fig. 6, fig. 6 a, B, and C show the planar radiation patterns of the serial gateway antenna 10 of this embodiment at 2400MHz frequency, the center point of the circle represents the position of the antenna, and the farther from the center point represents the larger the gain of the antenna. The part a in fig. 6 is an H-plane radiation pattern, the part B in fig. 6 is an E1-plane radiation pattern, the part C in fig. 6 is an E2-plane radiation pattern, the plane E is a plane in which the maximum radiation direction and the electric field are located, the planes E1 and E2 are perpendicular to each other, that is, the plane in which the metal radiator 13 is located, and the plane H is a plane in which the magnetic field and the maximum radiation direction are located, that is, the plane perpendicular to the metal radiator 13. At 2400MHz, it can be seen that the radiation patterns shown in part a of fig. 6 and part C of fig. 6 are both relatively close to circular and have relatively high gain.

Referring to fig. 7, a, B, and C in fig. 7 show the planar radiation patterns of the serial gateway antenna 10 of this embodiment at 2450MHz frequency, where the center point of the circle represents the position of the antenna, and the farther from the center point represents the larger gain of the antenna. The part a in fig. 7 is an H-plane radiation pattern, the part B in fig. 7 is an E1-plane radiation pattern, the part C in fig. 7 is an E2-plane radiation pattern, the E-plane is a plane where the maximum radiation direction and the electric field are located, that is, the plane where the metal radiator 13 is located, and the H-plane is a plane where the magnetic field and the maximum radiation direction are located, that is, a plane perpendicular to the metal radiator 13. At 2450MHz, the radiation patterns shown in part a of fig. 7 and part C of fig. 7 are found to be relatively close to circular and have relatively high gain.

Referring to fig. 8, fig. 8 a, B, and C show the planar radiation patterns of the serial gateway antenna 10 of the present embodiment at a frequency of 2500MHz, where the center point of the circle represents the position of the antenna, and the farther from the center point represents the larger the gain of the antenna. The portion a in fig. 8 is an H-plane radiation pattern, the portion B in fig. 8 is an E1-plane radiation pattern, the portion C in fig. 8 is an E2-plane radiation pattern, the E-plane is a plane where the maximum radiation direction and the electric field are located, that is, the plane where the metal radiator 13 is located, and the H-plane is a plane where the magnetic field and the maximum radiation direction are located, that is, a plane perpendicular to the metal radiator 13. At 2500MHz, the radiation patterns shown in part a of fig. 8 and part C of fig. 8 are found to be more nearly circular and have higher gain.

In summary, in the serial gateway antenna 10 of the present embodiment, the metal radiators 13 all have a radiation pattern with an approximately omnidirectional characteristic, and omnidirectional radiation can be basically achieved.

The serial port gateway antenna 10 provided by the embodiment of the application is connected with the serial port gateway through the terminal 121 arranged on the signal line 12, the circuit board 11 is electrically connected with the other end of the serial port gateway, signal radiation can be carried out through the metal radiating body 13 on the circuit board 11, omnidirectional radiation can be realized while the serial port gateway is adapted, and the serial port gateway antenna has high antenna gain and good radiation efficiency.

The above embodiments are only for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will 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 application and are intended to be included within the scope of the present application.

Claims

1. A serial port gateway antenna, comprising:

the circuit board is arranged on a metal radiating body on the circuit board, the metal radiating body comprises a first branch knot, a second branch knot and a third branch knot, two ends of the third branch knot bend towards the same side to form a first bending part and a second bending part, one end of the first branch knot is connected to the first bending part, one end of the second branch knot is connected to the second bending part, a first gap is formed between the other end of the first branch knot and the other end of the second branch knot, the first branch knot is provided with a feed point, and the second branch knot is provided with a feed point; and

and one end of the signal wire penetrates through the first gap and is electrically connected with the feed point and the feed point, and the other end of the signal wire is provided with a connecting terminal.

2. The serial gateway antenna of claim 1, wherein the metal radiator further comprises a fourth branch and a fifth branch, the fourth branch is connected to one end of the first branch close to the second branch, and the fifth branch is connected to one end of the second branch close to the first branch.

3. The serial gateway antenna according to claim 1 or 2, wherein the feed point is disposed at an end of the first branch near the second branch, and the feed point is disposed at an end of the second branch near the first branch.

4. The serial port gateway antenna according to claim 1 or 2, wherein the first branch and the third branch are disposed opposite to each other, the second branch and the third branch are disposed opposite to each other, and the first branch and the second branch are located on the same side of the third branch.

5. The serial gateway antenna of claim 4, wherein the first stub and the second stub are arranged collinearly.

6. The serial gateway antenna of claim 1, wherein the signal line is disposed obliquely with respect to the first gap.

7. The serial gateway antenna of claim 1, wherein the signal line comprises a first core layer and a second core layer electrically insulated from each other, the first core layer connecting the feed point, the second core layer connecting the feed point.

8. The serial gateway antenna of claim 7, wherein the terminal is provided with a transmission terminal and a ground terminal; the transmission terminal is connected with the first core layer, and the grounding terminal is connected with the second core layer.

9. The serial port gateway antenna of claim 1, wherein the length of the circuit board is 39.01mm-39.51mm, and the width of the circuit board is 8.95mm-9.45mm.

10. The serial gateway antenna of claim 1, wherein the antenna is a ZigBee antenna.