Narrowband Internet of Things antenna and Internet of Things device

Abstract

The utility model provides a narrowband Internet of Things antenna and Internet of Things equipment, and relates to the technical field of antennae, the narrowband Internet of Things antenna comprises a first radiation unit, a second radiation unit and a transmission line, the first radiation unit and the second radiation unit are respectively connected with the transmission line, and the first radiation unit and the second radiation unit are mutually plugged along a first direction, the first radiation unit and the second radiation unit are asymmetrically arranged relative to the transmission line, the transmission line is arranged along a second direction, and the second direction is perpendicular to the first direction. The first radiation unit and the second radiation unit are mutually plugged and coupled along the first direction and are combined with the transmission line, so that the overall structure size is small, the miniaturization scene requirement is met, and the cost is reduced. The first radiation unit and the second radiation unit are asymmetrically arranged relative to the transmission line, so that the first radiation unit and the second radiation unit form monopoles, different resonance branches generate different resonance frequencies, the effect of broadening the bandwidth is achieved, and the effects of strong antenna transmission signal, small size and low cost are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a narrowband Internet of Things antenna and an Internet of Things device. BACKGROUND

[0002] The antenna is a key device for signal transmission and signal reception in a communication system, and the radiation performance and reception performance of the antenna will directly affect the performance of the entire communication system. With the rapid development of the Internet of Things technology, people have higher requirements for communication quality.

[0003] Among them, narrowband Internet of Things (NB-IoT) has become an important branch of the Internet of Things network. The NB-IoT technology is an Internet of Things technology based on the LTE network, which has the advantages of low power consumption, high reliability and security, can support a large number of nodes, can support long-range communication between nodes, can support complex Internet of Things applications, can be applied to smart home, intelligent transportation, intelligent parking, intelligent agriculture, intelligent logistics, intelligent environmental monitoring and other Internet of Things applications, can provide more reliable connection, and can improve the efficiency of Internet of Things applications, but its data transmission rate is slow, the cost is high, and the coverage is small.

[0004] In the traditional NB-IoT product, the antenna is usually in the form of a spring and a steel sheet. This design form occupies a large internal space for the adapted model, and cannot meet the adaptation requirements of smaller devices, resulting in that the space and size available for antenna installation become extremely strict, and the use of external antennas affects the appearance of the device and occupies more external space, which also requires a strict surrounding environment. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the embodiment of the present application is to provide a narrowband Internet of Things antenna and an Internet of Things device, which has strong signal transmission, small size and low cost.

[0006] In one aspect of the embodiment of the present application, a narrowband Internet of Things antenna is provided, which comprises a first radiation unit, a second radiation unit and a transmission line, the first radiation unit and the second radiation unit are connected with the transmission line, the first radiation unit and the second radiation unit are inserted into each other along a first direction, and the first radiation unit and the second radiation unit are asymmetrically arranged about the transmission line, the transmission line is arranged along a second direction, and the second direction is perpendicular to the first direction.

[0007] Optionally, the first radiation unit is connected with the transmission line through a first feed point, the second radiation unit is connected with the transmission line through a second feed point, and the first feed point, the second feed point and the transmission line are collinear.

[0008] Optionally, the first radiating unit forms a first opening facing the second radiating unit, the second radiating unit forms a second opening facing the first radiating unit, the first radiating unit comprises a plurality of first radiating arms connected in sequence, and the second radiating unit comprises a plurality of second radiating arms connected in sequence, wherein one of the first radiating arms is inserted into the second opening, and one of the second radiating arms is inserted into the first opening.

[0009] Optionally, the antenna frequency band of the first radiating unit is 820MHz-960MHz, the first radiating unit comprises a plurality of first radiating arms connected in sequence, and the length of each of the plurality of first radiating arms along the first direction is one-eighth of the wavelength of the antenna frequency band of the first radiating unit.

[0010] Optionally, the antenna frequency band of the second radiating unit is 1710MHz-1880MHz, the second radiating unit comprises a plurality of second radiating arms connected in sequence, and the length of each of the plurality of second radiating arms along the first direction is one-fourth of the wavelength of the antenna frequency band of the second radiating unit.

[0011] Optionally, the first radiating arm has five first radiating arms connected in sequence, and the length of each of the five first radiating arms connected in sequence along the first direction is L1=10mm-15mm, L2=15mm-20mm, L3=8mm-12mm, L4=8mm-12mm, and L5=4mm-8mm.

[0012] Optionally, the width of each of the five first radiating arms connected in sequence along the direction perpendicular to the first direction is W1=3mm-4mm, W2=3mm-4mm, W3=2mm-3mm, W4=2mm-3mm, and W5=2mm-3mm.

[0013] Optionally, the second radiating arm has three second radiating arms connected in sequence, and the length of each of the three second radiating arms connected in sequence along the first direction is L6=4mm-7mm, L7=6mm-9mm, and L8=5mm-10mm.

[0014] Optionally, the width of each of the three second radiating arms connected in sequence along the direction perpendicular to the first direction is W6=1mm-3mm, W7=2mm-3mm, and W8=2mm-3mm.

[0015] Another aspect of the embodiments of the present application provides an Internet of Things device, comprising the narrowband Internet of Things antenna of any one of the above.

[0016] The narrowband Internet of Things antenna and the Internet of Things device provided by the embodiment of the present application, the first radiation unit and the second radiation unit are inserted and coupled with each other along the first direction, combined with the transmission line, so that the overall structure size is small, to meet the scene demand of miniaturization, and the cost is also reduced. Moreover, the first radiation unit and the second radiation unit are asymmetrically arranged about the transmission line, so that the first radiation unit and the second radiation unit are both formed in the form of a monopole, different resonant branches (radiation arms) produce different resonant frequencies, and play a role in widening the bandwidth, so that the narrowband Internet of Things antenna of the present application transmits a strong signal, thereby realizing the effects of strong signal transmission, small size and low cost of the narrowband Internet of Things antenna. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 is a schematic diagram of the narrowband Internet of Things antenna structure provided by the embodiment of the present application;

[0019] Figure 2 is one of the size schematic diagrams of the narrowband Internet of Things antenna provided by the embodiment of the present application;

[0020] Figure 3 is the second size schematic diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application;

[0021] Figure 4 is the standing wave diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application;

[0022] Figure 5 is the low-frequency passive efficiency diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application;

[0023] Figure 6 is the high-frequency passive efficiency diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application.

[0024] Figure: 10 - housing; 11 - first radiation unit; 110 - first feed point; 111 - first opening; 12 - second radiation unit; 120 - second feed point; 121 - second opening; 13 - transmission line; F1 - first direction; F2 - second direction; length - L, Lm, L1, L2, L3, L4, L5, L6, L7, L8; width - W1, W2, W3, W4, W5, W6, W7, W8. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely in the description of the present application in combination with the drawings in the embodiments of the present application.

[0026] In the description of the present application, it should be noted that the positions or location relationships indicated by the terms "inner", "outer" and the like are based on the positions or location relationships shown in the drawings, or the positions or location relationships in which the products of the present application are usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0027] It should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] An antenna is a kind of transformer, which transforms the guided wave propagating on a transmission line into electromagnetic wave propagating in unbounded medium (usually free space), or performs the opposite transformation. In radio equipment, the part used to emit or receive electromagnetic wave. Radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing, radio astronomy and other engineering systems that use electromagnetic waves to transmit information rely on antennas to work. In addition, in terms of energy transmission by electromagnetic waves, non-signal energy radiation also requires antennas. Generally, antennas have reversibility, that is, the same antenna can be used as a transmitting antenna and a receiving antenna. The basic characteristic parameters of the same antenna as a transmitting or receiving antenna are the same. This is the reciprocity theorem of the antenna.

[0029] Among them, NB-IoT is built on the cellular network, only consumes about 180 kHz bandwidth, can be directly deployed in GSM network, UMTS network or LTE network, to reduce the deployment cost, realize smooth upgrade. NB-IoT is an emerging technology in the field of IOT, which supports low-power devices in wide area network cellular data connection, also known as low-power wide-area network (LPWAN). NB-IoT supports long standby time and efficient connection of devices with high requirements for network connection.

[0030] Features of NB-IoT:

[0031] Wide coverage, will provide improved indoor coverage, under the same frequency band, NB-IoT is 20dB higher than the existing network, equivalent to 100 times the coverage area of the ability to enhance;

[0032] Supporting connection, NB-IoT one sector can support 100,000 connections;

[0033] Lower power consumption, NB-IoT terminal module standby time can be up to 10 years;

[0034] Lower module cost.

[0035] The narrowband Internet of Things antenna is more and more inclined to the direction of small size, light weight and low price in the present environment.

[0036] Therefore, referring to Figure 1 The narrowband Internet of Things antenna (hereinafter referred to as antenna) provided by the embodiment of the application comprises: a first radiation unit 11, a second radiation unit 12 and a transmission line 13, the first radiation unit 11 and the second radiation unit 12 are connected with the transmission line 13 respectively, the first radiation unit 11 and the second radiation unit 12 are inserted with each other along a first direction F1, and the first radiation unit 11 and the second radiation unit 12 are asymmetrically arranged about the transmission line 13, the transmission line 13 is arranged along a second direction F2, and the second direction F2 is perpendicular to the first direction F1.

[0037] The first radiation unit 11 and the second radiation unit 12 are connected with external devices through the transmission line 13 to transmit signals. The first radiation unit 11 and the second radiation unit 12 of the application are inserted and coupled, for example, the second radiation unit 12 forms a structure similar to "] ", the first radiation unit 11 is as shown in Figure 1 The two are inserted and coupled with each other along the first direction F1, combined with the transmission line 13, so that the overall structure size is small to meet the scene demand of miniaturization, and the cost is also reduced.

[0038] For example, the first radiation unit 11 and the second radiation unit 12 of the application are arranged in the shell 10, the overall volume of the antenna (the volume of the shell 10) is 17.5mm in length (the first direction F1), 17mm in width (the second direction F2) and 5.4mm in thickness, and the overall volume is small.

[0039] In addition, the first radiation unit 11 and the second radiation unit 12 are asymmetrically arranged about the transmission line 13. As Figure 1 It can be seen that the transmission line 13 is inclined to the second radiation unit 12, the first radiation unit 11 and the second radiation unit 12 are asymmetrically arranged about the transmission line 13, so that the first radiation unit 11 and the second radiation unit 12 form the form of monopole, different resonance branches (radiation arms) produce different resonance frequencies, and play the role of widening the bandwidth, so that the narrowband Internet of Things antenna of the application transmits strong signals, thereby realizing the effects of strong signal transmission, small size and low cost of the narrowband Internet of Things antenna.

[0040] Further, the first radiating unit 11 is connected with the first feeding point 110 and the transmission line 13, and the second radiating unit 12 is connected with the second feeding point 120 and the transmission line 13, and the first feeding point 110 and the second feeding point 120 are collinear with the transmission line 13.

[0041] The first feeding point 110 is arranged on one first radiating arm (corresponding to L5) of the first radiating unit 11, the second feeding point 120 is arranged on one second radiating arm (corresponding to L6) of the second radiating unit 12, and the transmission line 13 is connected with the first feeding point 110 and the second feeding point 120 and collinear with the first feeding point 110 and the second feeding point 120 to form a structure of Figure 1 .

[0042] The first radiating unit 11 includes a plurality of first radiating arms connected in sequence, and the second radiating unit 12 includes a plurality of second radiating arms connected in sequence.

[0043] For example, the first radiating arms are five, and the five first radiating arms are connected in sequence; the second radiating arms are three, and the three second radiating arms are connected in sequence; the five first radiating arms and the three second radiating arms are both strip structures, and the strip structures are connected in sequence at the head and tail, the first radiating unit 11 formed by the five first radiating arms is a special-shaped structure, and the first radiating unit 11 forms a first opening 111 facing the second radiating unit 12, and the three second radiating arms form a second radiating unit 12 forming a structure similar to "] ", and the second radiating unit 12 forms a second opening 121 facing the first radiating unit 11, one of the first radiating arms is inserted into the second opening 121, and one of the second radiating arms is inserted into the first opening 111, so as to form a structure of the first radiating unit 11 and the second radiating unit 12 being inserted into each other in the first direction F1. Figure 1 .

[0044] Among them, the first radiating arm corresponding to L5 is inserted into the second opening 121, and the second radiating arm corresponding to L8 is inserted into the first opening 111, so that the first radiating unit 11 and the second radiating unit 12 form a plug-in mode to be coupled, so as to reduce the size of the structure.

[0045] The narrowband Internet of Things antenna frequency band of the present application is 820-960MHz&1710-1880MHz. Specifically, the antenna frequency band of the first radiating unit 11 is 820MHz-960MHz, and the antenna frequency band of the second radiating unit 12 is 1710MHz-1880MHz.

[0046] Among them, as shown in Figure 2As shown, the first radiating unit 11 includes five first radiating arms connected in sequence, and the lengths of the five first radiating arms connected in sequence along the first direction F1 are L1=10mm~15mm, L2=15mm~20mm, L3=8mm~12mm, L4=8mm~12mm, and L5=4mm~8mm in sequence.

[0047] The second radiating unit 12 includes three second radiating arms connected in sequence, and the lengths of the three second radiating arms connected in sequence along the first direction F1 are L6=4mm~7mm, L7=6mm~9mm, and L8=5mm~10mm in sequence.

[0048] For example, Figure 3 As shown, the widths of the five first radiating arms connected in sequence along the direction perpendicular to the first direction F1 are W1=3mm~4mm, W2=3mm~4mm, W3=2mm~3mm, W4=2mm~3mm, and W5=2mm~3mm in sequence.

[0049] The widths of the three second radiating arms connected in sequence along the direction perpendicular to the first direction F1 are W6=1mm~3mm, W7=2mm~3mm, and W8=2mm~3mm in sequence.

[0050] By adjusting the lengths of the respective resonant branches (radiating arms) and the gap widths between the respective resonant branches, the respective radiating arms of the antenna can be reasonably utilized to adjust the frequency of the antenna.

[0051] In some embodiments, the length L1=13.6mm, the length L2=17.3mm, the length L3=9.9mm, the length L4=10.0mm, the length L5=6.0mm, the length L6=5.3mm, the length L7=7.9mm, and the length L8=7.1mm.

[0052] The width W1=3.4mm, the width W2=3.4mm, the width W3=2.7mm, the width W4=2.3mm, the width W5=2.2mm, the width W6=2.0mm, the width W7=2.4mm, and the width W8=2.15mm.

[0053] In which, 820MHz~960MHz is mainly generated by L1&W2&L3&L4&L5, and the length is about one-eighth of the medium wavelength of the frequency; 1710MHz~1880MHz is mainly generated by L6&L7&L8, and the length is about one-fourth of the medium wavelength of the frequency.

[0054] By reasonably adjusting the lengths of the respective resonant branches and the gap widths between the respective resonant branches, the antenna bandwidth of 820~960MHz&1710~1880MHz can be adjusted.

[0055] For example,Figure 2 As shown, the first height L of the transmission line 13 along the second direction F2 perpendicular to the first direction F1 is 40±0.500mm; as Figure 3 As shown, the second height Lm of the transmission line 13 along the second direction F2 is 40±0.500mm.

[0056] In summary, the narrowband Internet of Things antenna provided by the embodiments of the present application is small in size and does not need to be given a larger reference ground as a conventional antenna; is suitable for an environment surrounding metal materials; and can be applied to the field of narrowband Internet of Things.

[0057] The present application has the advantages of Figure 4 The test standing wave diagram of the antenna is shown, Figure 4 Marker 1~Marker 2 in the curve are the low-frequency bandwidth of the antenna, the bandwidth range is 820MHz~960MHz, and the overall VSWR (Voltage Standing Wave Ratio, generally referred to as standing wave ratio) is less than 2.7; Marker 3~Marker 4 are the high-frequency bandwidth of the antenna, the bandwidth range is 1710MHz~1880MHz, and the overall VSWR is less than 3.5, and the performance is good.

[0058] Figure 5 The low-frequency passive efficiency diagram of the antenna is shown, the overall low-frequency efficiency can reach more than 48%, and the low-frequency performance of the antenna is good.

[0059] Figure 6 The high-frequency passive efficiency diagram of the antenna is shown, the overall high-frequency efficiency can reach more than 38%, and the low-frequency performance of the antenna is good.

[0060] Through the above tests, Figures 4-6 further verify the function of the narrowband Internet of Things antenna of the present application.

[0061] The embodiments of the present application also disclose an Internet of Things device, comprising the narrowband Internet of Things antenna according to any one of the above.

[0062] The Internet of Things device comprises the same structure and beneficial effects as the narrowband Internet of Things antenna in the foregoing embodiments. The structure and beneficial effects of the narrowband Internet of Things antenna have been described in detail in the foregoing embodiments, and will not be described here.

[0063] The above only describes the embodiments of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A narrowband internet of things antenna, characterized by, The antenna comprises: a first radiating element, a second radiating element and a transmission line, the first radiating element and the second radiating element are connected with the transmission line respectively, the first radiating element and the second radiating element are inserted into each other along a first direction, and the first radiating element and the second radiating element are asymmetrically arranged about the transmission line, the transmission line is arranged along a second direction, and the second direction is perpendicular to the first direction.

2. The narrowband Internet of Things antenna of claim 1, wherein, The first radiating element is connected with the transmission line through a first feed point, the second radiating element is connected with the transmission line through a second feed point, and the first feed point and the second feed point are collinear with the transmission line.

3. The narrowband Internet of Things antenna of claim 1, wherein, The first radiating element forms a first opening towards the second radiating element, the second radiating element forms a second opening towards the first radiating element, the first radiating element comprises a plurality of first radiating arms connected in sequence, the second radiating element comprises a plurality of second radiating arms connected in sequence, one of the first radiating arms is inserted into the second opening, and one of the second radiating arms is inserted into the first opening.

4. The narrowband Internet of Things antenna according to any one of claims 1 to 3, wherein, The antenna frequency band of the first radiating element is 820MHz-960MHz, the first radiating element comprises a plurality of first radiating arms connected in sequence, and the length of each of the plurality of first radiating arms along the first direction is one-eighth of the medium wavelength of the antenna frequency band of the first radiating element.

5. The narrowband Internet of Things antenna according to any one of claims 1 to 3, wherein, The antenna frequency band of the second radiating element is 1710MHz-1880MHz, the second radiating element comprises a plurality of second radiating arms connected in sequence, and the length of each of the plurality of second radiating arms along the first direction is one-fourth of the medium wavelength of the antenna frequency band of the second radiating element.

6. The narrowband Internet of Things antenna of claim 4, wherein, The first radiating arm has five first radiating arms connected in sequence, and the length of each of the five first radiating arms connected in sequence along the first direction is L1=10mm-15mm, L2=15mm-20mm, L3=8mm-12mm, L4=8mm-12mm, and L5=4mm-8mm.

7. The narrowband internet of things antenna of claim 6, wherein, The width of each of the five first radiating arms connected in sequence along a direction perpendicular to the first direction is W1=3mm-4mm, W2=3mm-4mm, W3=2mm-3mm, W4=2mm-3mm, and W5=2mm-3mm.

8. The narrowband Internet of Things antenna of claim 5, wherein, The second radiating arm has three second radiating arms connected in sequence, and the length of each of the three second radiating arms connected in sequence along the first direction is L6=4mm-7mm, L7=6mm-9mm, and L8=5mm-10mm.

9. The narrowband Internet of Things antenna of claim 8, wherein, The width of each of the three second radiating arms connected in sequence along a direction perpendicular to the first direction is W6=1mm-3mm, W7=2mm-3mm, and W8=2mm-3mm.

10. An Internet of Things device, comprising: The narrowband Internet of Things antenna comprises the antenna according to any one of claims 1 to 9.

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