Narrowband Internet of Things antenna and narrowband Internet of Things terminal device

Abstract

The utility model provides a narrowband Internet of Things antenna and narrowband Internet of Things terminal equipment, and relates to the technical field of narrowband Internet of Things. The narrowband Internet of Things antenna comprises a substrate, an antenna body, a microstrip line, an impedance matching network and a connector, the antenna body, the microstrip line, the impedance matching network and the connector are arranged on the substrate, the antenna body, the microstrip line, the impedance matching network and the connector are electrically connected in sequence, the impedance matching network is provided with a plurality of interfaces, the interfaces are connected with an electronic element, and the electronic element is used for adjusting the frequency band of the narrowband Internet of Things antenna. The connector is used for being connected with an analyzer so as to test the current frequency band of the narrowband Internet of Things antenna. The narrowband Internet of Things antenna can be freely switched and used in a wide frequency band range by adjusting the value of an electronic element accessed in the impedance matching network.

Description

Technical Field

[0001] This application relates to the technical field of narrowband Internet of Things (NB-IoT), and more particularly, to a narrowband Internet of Things antenna and a narrowband Internet of Things terminal device. Background Art

[0002] A narrowband Internet of Things antenna (NB-IoT antenna, Narrow Band Internet of Things) is an antenna specifically designed to support low-power devices for cellular data connection in a wide area network, with characteristics such as wide coverage, multiple connections, high speed, low cost, low power consumption, and excellent architecture, and is widely used in fields such as agriculture and animal husbandry, remote meter reading, smart home, and smart city.

[0003] With the continuous development of communication technologies in various fields, there are more and more communication protocols and communication frequency bands. However, the existing narrowband Internet of Things antennas have a narrow frequency band range and are difficult to meet the communication requirements of multiple frequency bands. Therefore, there is an urgent need for a narrowband Internet of Things antenna that can freely switch and use within a relatively wide frequency band range. Utility Model Content

[0004] The purpose of this application is to provide a narrowband Internet of Things antenna and a narrowband Internet of Things terminal device that can freely switch and use within a relatively wide frequency band range for the deficiencies in the above-mentioned existing technologies.

[0005] To achieve the above purpose, the technical solutions adopted in the embodiments of this application are as follows:

[0006] On the one hand, an embodiment of this application provides a narrowband Internet of Things antenna, including: a substrate, an antenna body disposed on the substrate, a microstrip line, an impedance matching network, and a connector. The antenna body, the microstrip line, the impedance matching network, and the connector are electrically connected in sequence. The impedance matching network has multiple interfaces, and the interfaces are connected to electronic components. The electronic components are used to adjust the frequency band of the narrowband Internet of Things antenna, and the connector is used to connect to an analyzer to test the current frequency band of the narrowband Internet of Things antenna.

[0007] Optionally, the electronic components include capacitors and / or inductors.

[0008] Optionally, the interfaces include series pads and / or parallel pads.

[0009] Optionally, the interfaces are connection pads disposed on the substrate, and the electronic components are welded to the connection pads.

[0010] Optionally, the electronic components include a first inductor, a second inductor, and a first capacitor. The first inductor is connected in series with the microstrip line, the second inductor is connected in parallel with the first inductor, and the first capacitor is connected in series with the second inductor.

[0011] Optionally, the interface includes a first series of bit pads, a first parallel bit pad, a second series of bit pads, a second parallel bit pad, a third series of bit pads, and a third parallel bit pad that are electrically connected in sequence. The first series of bit pads is also electrically connected to the microstrip line, and the third parallel bit pad is also electrically connected to the connector.

[0012] Optionally, a clearance area is defined on the substrate, and the antenna body patch is welded within the clearance area.

[0013] Optionally, a plurality of first fixed contacts are provided within the clearance area, and a plurality of second fixed contacts are provided on the antenna body. The plurality of second fixed contacts are welded to the plurality of first fixed contacts in a one-to-one correspondence.

[0014] Optionally, signal contacts are further provided on the antenna body, and the signal contacts are connected to the microstrip line.

[0015] On the other hand, an embodiment of the present application provides a narrowband Internet of Things terminal device, including the narrowband Internet of Things antenna as described in any one of the above.

[0016] The beneficial effects of the present application include:

[0017] The present application provides a narrowband Internet of Things antenna, including: a substrate, an antenna body provided on the substrate, a microstrip line, an impedance matching network, and a connector. The antenna body, the microstrip line, the impedance matching network, and the connector are electrically connected in sequence. The impedance matching network has a plurality of interfaces, and the interfaces are connected to electronic components. The electronic components are used to adjust the frequency band of the narrowband Internet of Things antenna, and the connector is used to connect to an analyzer to test the current frequency band of the narrowband Internet of Things antenna. The narrowband Internet of Things antenna can freely switch and use within a relatively wide frequency band range by adjusting the values of the electronic components connected in the impedance matching network. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application;

[0020] Figure 2 For Figure 1 The partial enlarged schematic diagram at A in

[0021] Figure 3 It is a VSWR schematic diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application;

[0022] Figure 4 Measured efficiency diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application;

[0023] Figure 5 Measured average gain diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application;

[0024] Figure 6 Measured peak gain diagram of the narrowband Internet of Things antenna provided by the embodiment of the present application.

[0025] Icons: 100 - narrowband Internet of Things antenna; 110 - substrate; 111 - clearance area; 120 - antenna body; 130 - microstrip line; 140 - impedance matching network; 141 - interface; 1411 - series pads; 1412 - parallel pads; 150 - connector. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application. It should be noted that, without conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the protection scope of the present application.

[0028] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this application is usually placed. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0031] On the one hand of the embodiments of the present application, with reference to Figure 1 , a narrowband Internet of Things antenna 100 is provided, including: a substrate 110, an antenna body 120 arranged on the substrate 110, a microstrip line 130, an impedance matching network 140, and a connector 150. The antenna body 120, the microstrip line 130, the impedance matching network 140, and the connector 150 are electrically connected in sequence. The impedance matching network 140 has a plurality of interfaces 141, and the interfaces 141 are connected to electronic components for adjusting the frequency band of the narrowband Internet of Things antenna 100. The connector 150 is used to connect to an analyzer to test the current frequency band of the narrowband Internet of Things antenna 100.

[0032] The substrate 110 is used to carry the antenna body 120, the microstrip line 130, the impedance matching network 140, and the connector 150. The substrate 110 is preferably a circuit board to facilitate the electrical connection of the antenna body 120, the microstrip line 130, the impedance matching network 140, and the connector 150. The microstrip line 130 is a microwave transmission line composed of a single conductor strip arranged on the substrate 110. One end of the microstrip line 130 is electrically connected to the antenna body 120 to achieve signal transmission, and the other end is connected to the impedance matching network 140. One end of the impedance matching network 140 is connected to the microstrip line 130, and the other end is connected to the connector 150, so as to transfer the signal of the microstrip line 130 to the connector 150. The impedance of the impedance matching network 140 is equal to the impedance of the microstrip line 130 and has the same phase, thereby preventing the signal from reflecting back to the microstrip line 130, improving the energy efficiency, and ensuring the transmission quality of the signal in the impedance matching network 140. Exemplarily, the microstrip line 130 is a 50-ohm microstrip line, and the impedance matching network 140 is a 50-ohm impedance matching network. One end of the connector 150 is connected to the impedance matching network 140, and the other end is used to connect to an external analyzer. In the analyzer, the waveform of the narrowband Internet of Things antenna 100 can be seen, or the narrowband Internet of Things antenna 100 can be tested.

[0033] The impedance matching network 140 has at least one interface 141, which is exposed on the substrate 110. Electronic components can be connected to the interface 141, and the electronic components access the impedance matching network 140 through the interface 141. During use, by connecting electronic components with different parameters at the interface 141, the frequency band of the narrowband IoT antenna 100 can be adjusted, so as to realize free switching and use within a wider frequency band range.

[0034] Optionally, the interface 141 is a connection pad provided on the substrate 110, and the electronic component is welded to the connection pad.

[0035] The connection pad is welded on the substrate 110, and the port of the electronic component accesses the impedance matching network 140 by connecting to the connection pad. Connecting the electronic component to the interface 141 by welding has simple operation and can ensure the stability of the connection.

[0036] Optionally, the electronic component includes a capacitor and / or an inductor.

[0037] The electronic component can be a capacitor or an inductor. Alternatively, the number of electronic components is at least two, where some of the electronic components are capacitors and some are inductors. By connecting capacitors with different capacitance values or inductors with different inductance values at the interface 141 of the impedance matching network 140, the frequency band of the IoT antenna can be adjusted to realize free switching of multiple frequency bands.

[0038] Optionally, the electronic component includes a first inductor, a second inductor, and a first capacitor. The first inductor is connected in series with the microstrip line 130, the second inductor is connected in parallel with the first inductor, and the first capacitor is connected in series with the second inductor.

[0039] Using a combination of capacitors and inductors to adjust the frequency band of the narrowband IoT antenna 100 has simple operation and is easy to implement.

[0040] Optionally, please refer to Figure 2 , the interface 141 includes a series pad 1411 and / or a parallel pad 1412.

[0041] The interface 141 of the impedance matching network 140 can be a series pad 1411 or a parallel pad 1412. Alternatively, the number of interfaces 141 of the impedance matching network 140 is at least two, where some of the interfaces 141 are series pads 1411 and some are parallel pads 1412. An electronic component can be connected at each interface 141, such as connecting a capacitor or an inductor. By setting different types of interfaces 141 (series pad 1411 and parallel pad 1412), multiple access methods can be provided for the electronic components, so that the narrowband IoT antenna 100 can be freely switched and used within a wider frequency band range.

[0042] Optionally, the interface 141 includes a first series of bit pads, a first parallel bit pad, a second series of bit pads, a second parallel bit pad, a third series of bit pads, and a third parallel bit pad that are electrically connected in sequence. The first series of bit pads is also electrically connected to the microstrip line 130, and the third parallel bit pad is also electrically connected to the connector 150.

[0043] A plurality of series bit pads 1411 and parallel bit pads 1412 are provided, and the series bit pads 1411 and the parallel bit pads 1412 are alternately connected. Electronic components can be selectively connected to the series bit pads 1411 or the parallel bit pads 1412, and different numbers of series bit pads 1411 and parallel bit pads 1412 can be used according to actual needs, so that the narrowband IoT antenna 100 can be freely switched and used within a wider frequency band range.

[0044] It should be noted that it is not necessary to use all three series bit pads 1411 and three parallel bit pads 1412. When adjusting the frequency band of the narrowband IoT antenna 100, some of the interfaces 141 can be selectively used.

[0045] Optionally, a clearance area 111 is defined on the substrate 110, and the antenna body 120 is surface-mounted and welded within the clearance area 111.

[0046] The antenna body 120 is welded to the surface of the clearance area 111 of the substrate 110 by surface mount technology. Excellent performance can be obtained with only a very small clearance area 111. Therefore, the size of the narrowband IoT antenna 100 can be effectively reduced, and the narrowband IoT antenna 100 can be installed in smaller devices. In addition, the antenna body 120 welded to the substrate 110 by surface mount technology is more secure and not likely to fall off during transportation and use, and can always maintain excellent performance. The surface mount technology can also greatly reduce the cost of the narrowband IoT antenna 100.

[0047] Optionally, a plurality of first fixed contacts are provided within the clearance area 111, and a plurality of second fixed contacts are provided on the antenna body 120. The plurality of second fixed contacts are welded to the plurality of first fixed contacts in a one-to-one correspondence.

[0048] The number of the first fixed contacts and the second fixed contacts is equal, and their positions correspond one-to-one. During surface mounting and welding, welding a plurality of pairs of first fixed contacts and second fixed contacts together can fix the antenna body 120. At the same time, providing a plurality of first fixed contacts and second fixed contacts can also improve the firmness of the surface mounting of the antenna body 120.

[0049] Optionally, signal contacts are further provided on the antenna body 120, and the signal contacts are connected to the microstrip line 130. Signal transmission between the antenna body 120 and the microstrip line 130 is achieved through the signal contacts.

[0050] Exemplarily, in a three-dimensional space, a first direction, a second direction, and a third direction are defined, and the three directions are perpendicular to each other pairwise; the substrate 110 has a dimension of 105.5 mm in the first direction and a dimension of 25 mm in the second direction; the clearance area 111 on the substrate 110 has a dimension of 15.28 mm in the first direction and a dimension of 25 mm in the second direction; the antenna body 120 has a dimension of 7 mm in the first direction, a dimension of 25.8 mm in the second direction, and a dimension of 3 mm in the third direction; the total length of the microstrip line 130 is 14 mm. The microstrip line 130 is electrically connected to the connector 150 after being serially connected with a first inductor of 3 NH, parallely connected with a second inductor of 7.5 NH, and serially connected with a first capacitor of 3 PF. The narrowband IoT antenna 100 supports a frequency band range of 791 MHz - 960 MHz.

[0051] Figure 3 It is a schematic diagram of the VSWR (Voltage Standing Wave Ratio) of the narrowband IoT antenna 100. Figure 4 It is a measured efficiency graph of the narrowband IoT antenna 100. Figure 5 It is a measured average gain graph. Figure 6 It is a measured peak gain graph of the narrowband IoT antenna 100. As can be seen from Figures 3 to 6 this, the narrowband IoT antenna 100 provided by the embodiment of the present application has an average efficiency higher than 55% within the frequency band range of 791 MHz - 960 MHz. The advantages compared with the prior art are as follows: with similar dimensions, the narrowband IoT antenna 100 provided by the embodiment of the present application has excellent performance; with similar performance, the narrowband IoT antenna 100 provided by the embodiment of the present application has a smaller size.

[0052] This embodiment also provides a narrowband IoT terminal device, including the narrowband IoT antenna 100 in any one of the above.

[0053] The narrowband IoT terminal device includes the same structure and beneficial effects as the narrowband IoT antenna 100 in the foregoing embodiment. The structure and beneficial effects of the narrowband IoT antenna 100 have been described in detail in the foregoing embodiment and will not be elaborated herein.

[0054] The above are only the preferred embodiments of the present application and are not used to limit the present application. The present application can have various changes and modifications. 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 in that: include: A substrate, an antenna body, a microstrip line, an impedance matching network and a connector arranged on the substrate, wherein the antenna body, the microstrip line, the impedance matching network and the connector are electrically connected in sequence, the impedance matching network has a plurality of interfaces, the interfaces are connected to electronic components, the electronic components are used to adjust the frequency band of the narrowband Internet of Things antenna, and the connector is used to connect to an analyzer to test the current frequency band of the narrowband Internet of Things antenna.

2. The narrowband Internet of Things antenna according to claim 1, characterized in that: The electronic components include capacitors and / or inductors.

3. The narrowband Internet of Things antenna according to claim 1, characterized in that: The interface includes serial pads and / or parallel pads.

4. The narrowband Internet of Things antenna according to claim 1, characterized in that: The interface is a connection pad arranged on the substrate, and the electronic component is connected to the connection pad by welding.

5. The narrowband Internet of Things antenna according to claim 2, characterized in that: The electronic component includes a first inductor, a second inductor and a first capacitor, the first inductor is connected in series with the microstrip line, the second inductor is connected in parallel with the first inductor, and the first capacitor is connected in series with the second inductor.

6. The narrowband Internet of Things antenna according to claim 3, characterized in that: The interface includes a first serial pad, a first parallel pad, a second serial pad, a second parallel pad, a third serial pad and a third parallel pad which are electrically connected in sequence, the first serial pad is also electrically connected to the microstrip line, and the third parallel pad is also electrically connected to the connector.

7. The narrowband Internet of Things antenna according to claim 1, characterized in that: A clearance area is defined on the substrate, and the antenna body patch is welded in the clearance area.

8. The narrowband Internet of Things antenna according to claim 7, characterized in that: A plurality of first fixed contacts are arranged in the clearance area, a plurality of second fixed contacts are arranged on the antenna body, and the plurality of second fixed contacts are welded to the plurality of first fixed contacts in a one-to-one correspondence.

9. The narrowband Internet of Things antenna according to claim 8, characterized in that: The antenna body is also provided with a signal contact, and the signal contact is connected to the microstrip line.

10. A narrowband Internet of Things terminal device, characterized in that: Comprising a narrowband Internet of Things antenna as described in any one of claims 1 to 9.

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