CN112909520A

CN112909520A - Dual-band NB-IOT antenna

Info

Publication number: CN112909520A
Application number: CN201911137075.3A
Authority: CN
Inventors: 陈小平; 熊德林; 陈国丞; 常建伟; 林铮
Original assignee: Foshan Viomi Electrical Technology Co Ltd
Current assignee: Foshan Viomi Electrical Technology Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2021-06-04

Abstract

The application discloses dual-frenquency's NB-IOT antenna includes: a substrate having a first side and a second side; the first radiation structure comprises a first array group and a second array group electrically connected with the first array group, the first array group is arranged on the first surface of the substrate, and the second array group is arranged on the second surface of the substrate; the second radiation structure is arranged on the first surface of the substrate and is electrically connected with the second arrangement group; and the feed structure is arranged on the first surface of the substrate and is electrically connected with the first array group. The first array group comprises a plurality of first array elements, and the second array group comprises second array elements electrically connected with the first array elements; the first arrangement piece, the second arrangement piece and the second radiation structure are bent, so that the first radiation structure generates resonance of a first preset fluctuation frequency, and the second radiation structure generates resonance of a second preset fluctuation frequency.

Description

Dual-band NB-IOT antenna

Technical Field

The application relates to the technical field of communication, in particular to a dual-frequency NB-IOT antenna.

Background

With the development of the internet of things and the 5G communication technology, the intelligent home can realize the large-scale household appliance interconnection scene, wherein one of important carriers is NB-IOT (narrowband internet of things), the NB-IOT technology is based on cellular communication, and the method is very suitable for communication transmission with large connection quantity, deep coverage, non-instant transmission, low power consumption and low cost.

For household appliances originally supporting LTE/GSM communication, the frequency band used by the NB-IOT is included in the LTE/GSM frequency band, so that communication transmission can be realized through a shared antenna; however, for the home appliances which originally do not have the cellular communication function, an additional antenna is required. Since the NB-IOT has an operating band at 900MHz, the antenna is usually large in size and not suitable for layout.

Disclosure of Invention

In view of the above, the present application provides a dual-band NB-IOT antenna, which can effectively solve the above-mentioned problems.

The embodiment of the application provides a dual-band NB-IOT antenna, which comprises:

a substrate having a first side and a second side;

the first radiation structure comprises a first array group and a second array group electrically connected with the first array group, the first array group is arranged on the first surface of the substrate, and the second array group is arranged on the second surface of the substrate;

the feed structure is arranged on the first surface of the substrate and is electrically connected with the first array group;

wherein the first arrangement group includes a plurality of first arrangements, and the second arrangement group includes a second arrangement electrically connected to the first arrangement; the first arrangement piece and the second arrangement piece are both bent, so that the first radiation structure generates resonance with a first preset fluctuation frequency.

In the embodiments provided in the present application, the NB-IOT antenna further includes a second radiation structure, the second radiation structure is disposed on the first surface of the substrate and electrically connected to the second array set, the second radiation structure is bent, and the second radiation structure generates a resonance with a second preset fluctuation frequency

In the embodiments provided by the present application, a plurality of the first alignment members are arranged at intervals along a length direction of the substrate; and/or the second arraying pieces are arrayed at intervals along the length direction of the substrate.

In an embodiment provided by the present application, the first arrangement piece includes a first arrangement arm and a second arrangement arm extending from one end of the first arrangement arm in a bending manner, and the second arrangement piece includes a third arrangement arm and a fourth arrangement arm extending from one end of the third arrangement arm in a bending manner; the length of the first arrangement arm is greater than that of the second arrangement arm, and the length of the third arrangement arm is greater than that of the fourth arrangement arm;

the first arrangement arm is parallel to the third arrangement arm, and the second arrangement arm is parallel to the fourth arrangement arm.

In embodiments provided herein, the first alignment arm is perpendicular to the second alignment arm; and/or the third arrangement arm is perpendicular to the fourth arrangement arm.

In an embodiment provided by the present application, the second alignment arm is bent and extended from one end of the first alignment arm toward a side away from the feeding structure; and/or the fourth arrangement arm is bent and extended from one end of the third arrangement arm to one side far away from the feeding structure.

In an embodiment provided herein, the first array arm is electrically connected to the fourth array arm or the feed structure; and/or the second array arm is electrically connected to the third array arm; and/or the fourth array arm is electrically connected to the first array arm or the second radiating structure; and/or the number of the first arrangement elements is the same as the number of the second arrangement elements.

In an embodiment provided by the present application, the second radiation structure comprises:

a first radiating arm electrically connected to the second array;

the second radiation arm is bent and extended from one end of the first radiation arm towards the first radiation structure;

wherein the length of the second radiating arm is greater than the length of the first radiating arm; and/or the second radiating arm is perpendicular to the first radiating arm;

and/or the first radiating structure is located between the first radiating arm and the feed structure.

In an embodiment provided by the present application, the NB-IOT antenna further includes a ground structure, the ground structure includes a first ground plane and a second ground plane, the first ground plane is disposed on the first surface, the second ground plane is disposed on the second surface, and the first ground plane and the second ground plane are connected and conducted through a plurality of connecting pieces;

and/or the first ground plane is provided with a feed area, part of the feed structure is positioned in the feed area, and a gap is formed between the feed structure and the ground structure in the feed area.

In an embodiment provided by the present application, the first preset fluctuation frequency is 900MHz, and the second preset fluctuation frequency is 1800 MHz.

The technical scheme provided by the embodiment of the application can have the following beneficial effects: the application provides a dual-frequency NB-IOT antenna, the dual-frequency NB-IOT antenna is made in the form of a PCB printing plate, under the condition that the size of the antenna is limited, a first array group is arranged on a first surface of a substrate, a second array group is arranged on a second surface of the substrate, so that the length of a first radiation structure is longer in a limited size space, meanwhile, the first array group is designed to be a plurality of first array component combinations, the second array group is designed to be a plurality of second array component combinations, the first array component is electrically connected with the second array component, the first surface, the second surface and the thickness of the substrate are fully utilized, the frequency band generated by the first radiation structure is 900MHz resonance, and meanwhile, the size of the NB-IOT antenna is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are 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 dual-band NB-IOT antenna according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of the dual-band NB-IOT antenna of fig. 1 at another angle;

fig. 3 is a schematic diagram of a partial structure of the dual-band NB-IOT antenna of fig. 1;

fig. 4 is a schematic structural view of the first radiating structure of fig. 1;

fig. 5 is a graph illustrating return loss performance of a dual-band NB-IOT antenna according to an embodiment of the present disclosure;

fig. 6a is a test pattern of a dual-band NB-IOT antenna in a plane, where the frequency band to be tested is 900MHz, and the test plane is parallel to the plane of the x-axis and the y-axis;

fig. 6b is a test pattern of a dual-band NB-IOT antenna in another plane, where the frequency band to be tested is 900MHz, and the test plane is parallel to the plane of the y-axis and the z-axis;

fig. 7a is a test pattern of a dual-band NB-IOT antenna in a plane, where a frequency band to be tested is 1800MHz, and a test plane is parallel to a plane of an x-axis and a y-axis;

fig. 7b is a test pattern of the dual-band NB-IOT antenna in another plane, where the frequency band to be tested is 1800MHz, and the test plane is parallel to the plane of the y-axis and the z-axis.

Description of reference numerals:

1000. an NB-IOT antenna;

100. a first radiating structure; 110. a first bank group; 111. a first arrangement member; 1111. a first alignment arm; 1112. a second array arm; 120. a second arranged group; 121. a second array member; 1211. a third array arm; 1212. a fourth arrangement arm; 130. metallizing the via hole;

200. a feed structure;

300. a second radiating structure; 310. a first radiating arm; 320. a second radiating arm;

400. a ground structure; 410. a first ground plane; 411. a feeding region; 420. a second ground plane; 430. a connecting member;

500. a substrate; 510. a first side; 520. a second face.

Detailed Description

The technical solutions 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 and fig. 2, an embodiment of the present application provides a dual-band NB-IOT antenna 1000, including: a substrate 500 having a first side 510 and a second side 520; a first radiation structure 100 including a first bank 110 and a second bank 120 electrically connected to the first bank 110, the first bank 110 being provided on a first surface 510 of a substrate 500, the second bank 120 being provided on a second surface 520 of the substrate 500; the feeding structure 200 is disposed on the first surface 510 of the substrate 500 and electrically connected to the first array group 110.

The first array group 110 includes a plurality of first arrangements 111, and the second array group 120 includes a second arrangement 121 electrically connected to the first arrangements 111; the first arrangement 111 and the second arrangement 121 are bent to make the first radiating structure 100 generate a resonance with a first predetermined fluctuation frequency.

Through the above design, the NB-IOT antenna 1000 is provided with the first radiation structure 100 and the second radiation structure 300 connected to the first radiation structure 100, wherein the first radiation structure 100 generates a resonance with a first preset fluctuation frequency, and the second radiation structure 300 generates a resonance with a second preset fluctuation frequency, so as to meet the dual-frequency requirement of the NB-IOT antenna 1000; meanwhile, the first array group 110 and the first array group 110 in the first radiation structure 100 are respectively arranged on two sides of the substrate 500 and are designed into a double-layer structure, the structural space of the substrate 500 is fully utilized, the electrical length of the first radiation structure 100 meets the resonance requirement of the emission frequency band of 900MHz, and meanwhile, the size of the NB-IOT antenna 1000 is reduced; on the other hand, the first array group 110 includes a plurality of first array elements 111, the second array group 120 includes a plurality of second array elements 121, and the first array elements 111 and the second array elements 121 are both bent, so that the surface of the first plane 510 and the surface of the second plane 520 are fully utilized, and the size of the NB-IOT antenna 1000 is further reduced.

Referring to fig. 1 and 2, the NB-IOT antenna 1000 further includes a second radiation structure 300 disposed on the first surface 510 of the substrate 500 and electrically connected to the second bank 120; the second radiation structure 300 is bent to make the second radiation structure 300 generate resonance with a second predetermined fluctuation frequency. The NB-IOT also has a working frequency band at 1800MHz, so that the NB-IOT antenna 1000 is required to be designed in a dual-band manner, the second radiation structure 300 is bent, the surface of the first surface 510 and the surface of the second surface 520 are fully utilized, and the frequency band generated by the second radiation structure 300 conforms to the working frequency band of the NB-IOT at 1800MHz on the premise of reducing the size of the NB-IOT antenna 1000.

Referring to fig. 1 and 2, in some embodiments, a plurality of first alignment members 111 are arranged at intervals along a length direction of a substrate 500; and/or the plurality of second alignment members 121 are arranged at intervals along the length direction of the substrate 500.

Specifically, the plurality of first alignment elements 111 are arranged at intervals along the longitudinal direction of the substrate 500, and the length of the substrate 500 is fully utilized, so that the number of first alignment elements 111 on the limited surface of the substrate 500 is as large as possible, thereby achieving the effect of reducing the size of the NB-IOT antenna 1000. It is understood that, in other embodiments, a plurality of first alignment members 111 are arranged at intervals along the width direction of the substrate 500; in other embodiments, the first alignment members 111 are arranged at intervals along the width direction and the length direction of the substrate 500; in other embodiments, the first alignment members 111 are simultaneously spaced apart from each other along a diagonal direction of the substrate 500. The arrangement of the plurality of first alignment members 111 is not limited in this application, and may be as wide as possible on the surface of the substrate 500.

It is understood that the plurality of second arrangement members 121 may be arranged in the same manner as the plurality of first arrangement members 111, or may be arranged in a different manner from the plurality of first arrangement members 111. In order to more clearly describe the technical solution of the embodiment of the present application, the following explanation is made by taking an example that the plurality of first alignment members 111 and the plurality of second alignment members 121 are arranged at intervals along the length direction of the substrate 500.

In some embodiments, referring to fig. 3 and 4, the first arrangement member 111 includes a first arrangement arm 1111 and a second arrangement arm 1112 bent and extended from one end of the first arrangement arm 1111, and the second arrangement member 121 includes a third arrangement arm 1211 and a fourth arrangement arm 1212 bent and extended from one end of the third arrangement arm 1211; first alignment arm 1111 is longer than second alignment arm 1112, and third alignment arm 1211 is longer than fourth alignment arm 1212; first alignment arm 1111 is parallel to third alignment arm 1211 and second alignment arm 1112 is parallel to fourth alignment arm 1212.

Specifically, referring to fig. 3 and 4, the first arm 1111 is perpendicular to the second arm 1112; and/or, the third array arm 1211 is perpendicular to the fourth array arm 1212. It will be appreciated that when first alignment arm 1111 is angled acutely with respect to second alignment arm 1112, second alignment arm 1112 may be longer than second alignment arm 1112 when first alignment arm 1111 is perpendicular to second alignment arm 1112, but the current vector on second alignment arm 1112 has a component in the direction of first alignment arm 1111 that is opposite to the current on first alignment arm 1111, reducing the radiation effect of first alignment element 111. It is understood that when the angle between the first alignment arm 1111 and the second alignment arm 1112 is obtuse, the length of the second alignment arm 1112 is longer than that of the second alignment arm 1112 when the first alignment arm 1111 and the second alignment arm 1112 are perpendicular, but the total length of the first alignment element 111 is shorter, which is not suitable for reducing the size of the NB-IOT antenna 1000.

In an alternative embodiment, the first arrangement 111 has the same size and structure as the second arrangement 121, so as to reduce the manufacturing cost and facilitate mass production. It will be appreciated that in an alternative embodiment, the first arrangement 111 may have a different size than the second arrangement 121 and/or the first arrangement 111 may have a different configuration than the second arrangement 121. In order to more clearly describe the technical solution of the embodiment of the present application, the following explanation is given by taking as an example that the size and the structure of the first arrangement member 111 are the same as those of the second arrangement member 121.

Referring to fig. 1 to 4, in some embodiments, the number of the first arrangement members 111 is the same as that of the second arrangement members 121. Specifically, under the conditions that the plurality of first arraying members 111 and the plurality of second arraying members 121 are arranged at intervals in the longitudinal direction of the substrate 500 and the size and structure of the first arraying members 111 are the same as those of the fourth arraying members, the first arraying members 111 are required to be arranged over the first surface 510 of the substrate 500 as much as possible, and the second arraying members 121 are required to be arranged over the second surface 520 of the substrate 500 as much as possible, thereby reducing the size of the NB-IOT antenna 1000.

In some embodiments, referring to fig. 1 and fig. 2, the second alignment arm 1112 is bent and extended from one end of the first alignment arm 1111 toward a side away from the feeding structure 200; and/or the fourth array arm 1212 is bent and extended from one end of the third array arm 1211 toward a side away from the feeding structure 200. The bending direction of the plurality of first alignment elements 111 and the plurality of second alignment elements 121 arranged at intervals along the length direction of the substrate 500 is a direction away from the power feeding structure 200, and the first alignment elements 111 and the second alignment elements 121 are prevented from being affected by the power feeding structure 200.

Specifically, referring to fig. 3 and 4, the first arrangement arm 1111 is electrically connected to the fourth arrangement arm 1212 or the feeding structure 200; and/or, second array arm 1112 is electrically connected to third array arm 1211; and/or, the fourth array arm 1212 is electrically connected to the first array arm 1111 or the second radiating structure 300.

In the radiation current of the entire NB-IOT antenna 1000, the starting end of the current in the first radiation structure 100 is the electrical connection point between the first radiation structure 100 and the feed structure 200, the first array group 110 and the feed structure 200 are both located on the first surface 510, and one end of the first array element 111 is electrically connected to the feed structure 200; meanwhile, the length of the first alignment arm 1111 in the first alignment element 111 is greater than the length of the second alignment arm 1112, and the plurality of first alignment elements 111 are arranged at intervals along the length direction of the substrate 500, and the first alignment arm 1111 in the first alignment element 111 at the start end is electrically connected to the feeding structure 200.

In order to make the whole first radiation structure 100 a complete radiation circuit, it is required that the plurality of first arrangement members 111 and the plurality of second arrangement members 121 are connected in series; in the case of electrical connection between first arranging arm 1111 in first arranging element 111 at the start end and feeding structure 200, second arranging arm 1112 in first arranging element 111 is electrically connected to third arranging arm 1211, and first arranging arm 1111 in first arranging element 111 at other positions is connected to fourth arranging arm 1212; under the condition that the number of the first arrangement pieces 111 and the second arrangement pieces 121 is the same, the tail end of the current in the first radiation structure 100 is the electrical connection point between the first radiation structure 100 and the second radiation structure 300, and the structure at the tail end is the fourth arrangement arm 1212 of the second arrangement piece 121. Through the above connection scheme, the first radiation structure 100 becomes a complete single line.

It is to be understood that the internal series connection manner of the first radiation structure 100 is not limited to the above connection manner, and the connection manner in which the feed structure 200, the first radiation structure 100 and the second radiation structure 300 jointly form a series circuit is also not limited to the above connection manner as long as the feed structure 200, the first radiation structure 100 and the second radiation structure 300 form a series circuit, and the present application is not limited thereto.

In some embodiments, first and

second arrangements

111, 121 are electrically connected by a metalized via 130. The diameter of all the metalized via holes 130 is 0.2 mm to 0.5 mm, the diameter and the distance of the metalized via holes 130 need to be controlled, the diameter of the via holes is too large, which can cause the first metal plate and the second metal plate not to be effectively connected, and the diameter of the via holes is too small, which can cause processing difficulty. Meanwhile, the metalized via 130 is used as a part of the whole first radiation structure 100 and participates in the radiation current of the first radiation structure 100, and the size of the NB-IOT antenna 1000 can be effectively reduced while the electrical length of the first radiation structure 100 meets the resonance requirement that the generated frequency band is 900 MHz.

Referring to fig. 3, in some embodiments, the second radiation structure 300 includes: a first radiation arm 310 electrically connected to the second array member 121; the second radiating arm 320 extends from one end of the first radiating arm 310 toward the first radiating structure 100. Wherein the length of the second radiating arm 320 is greater than the length of the first radiating arm 310.

Specifically, the second radiation arm 320 is perpendicular to the first radiation arm 310. In a specific embodiment, the first radiating arm 310 extends along the width direction of the substrate 500, the second radiating arm 320 extends along the length direction of the substrate 500, and the second radiating structure 300 utilizes the length and the width of the substrate 500 to reduce the size of the NB-IOT antenna 1000 under the condition that the second radiating structure 300 generates the resonance in the 1800MHz frequency band.

Specifically, the first radiation structure 100 is located between the first radiation arm 310 and the feed structure 200. That is, the first radiation arm 310 and the feed structure 200 are located at both ends of the first plane 510 in the length direction, so that the first radiation arm 310 makes full use of the width of the substrate 500 to maximize the length of the first radiation arm 310.

Specifically, the length of the second radiation arm 320 is substantially the same as the arrangement length of the plurality of first arrangements 111, so that the second radiation arm 320 makes the best use of the length of the substrate 500 to maximize the length of the second radiation arm 320.

Referring to fig. 1 and 2, the NB-IOT antenna 1000 further includes a ground structure 400, the ground structure 400 includes a first ground plane 410 and a second ground plane 420, the first ground plane 410 is disposed on the first surface 510, the second ground plane 420 is disposed on the second surface 520, and the first ground plane 410 and the second ground plane 420 are connected and conducted through a plurality of connectors 430.

The grounding structure 400 is provided with the first grounding surface 410 and the second grounding surface 420, and the first grounding surface 410 and the second grounding surface 420 are connected and conducted at the same time, under the condition that the size of the substrate 500 is limited, the first surface 510 and the second surface 520 of the substrate 500 are fully utilized, so that the grounding area of the grounding structure 400 is larger, the grounding effect of the grounding structure 400 is better, and the radiation of the NB-IOT antenna 1000 is closer to a theoretical value.

In some embodiments, the connection 430 is in the form of a metalized via 130. The diameters of all the metalized vias 130 are 0.2 mm to 0.4 mm, the hole pitch of the metalized vias 130 is 0.5 mm to 1.0 mm, the diameters and the pitches of the metalized vias 130 are adjusted according to actual processing requirements, the diameters and the pitches of the metalized vias 130 are required to be controlled, the diameter of the via is too large, the first ground plane 410 and the second ground plane 420 cannot be effectively connected, and the via is too small, so that the processing difficulty is caused. Similarly, the upper layer and the lower layer cannot be effectively connected due to too large space between the through holes, and the processing difficulty is caused due to too small space. The present application, through optimization design and trial and error, gives the best dimension and pitch range for the metalized vias 130. In a specific embodiment, the metalized holes have a diameter of 0.3 mm and a spacing of 0.7 mm, which ensures that the first ground plane 410 and the second ground plane 420 can be effectively connected.

Specifically, the first ground plane 410 is provided with a feeding area 411, a portion of the feeding structure 200 is located in the feeding area 411, and the feeding structure 200 and the ground structure 400 form a gap in the feeding area 411. Experiments prove that when the width range of the gap is 0.3 mm to 0.5 mm, such as 0.3 mm, 0.4 mm or 0.5 mm, the influence of the current of the feed point on the NB-IOT antenna 1000 can be effectively reduced. In a specific embodiment, the impedance of the feed structure 200 is 50 Ω, and the feed structure 200 can be connected to an external IPEX coaxial cable, so as to connect the NB-IOT antenna 1000 to the smart appliance.

Referring to fig. 5-7, the dual-band NB-IOT antenna 1000 provided in the present application is improved and refined many times, and finally, through the verification of instrument detection, the frequency of radiation generated by the first radiation structure 100 is 900MHz, and the frequency of radiation generated by the second radiation structure 300 is 1800 MHz. Under the above two frequency bands, the return loss and the omnidirectional performance of the NB-IOT antenna 1000 meet the requirements of NB-IOT.

In a specific embodiment, the substrate 500 is RF4 in a material and has a thickness in the range of 1.0 mm to 1.6 mm to accommodate PCB printed board implementations of the NB-IOT antenna 1000. The RF4 has low cost, easy acquisition, high consistency for mass production and wide universality. Specifically, experiments verify that the total length of the single first arranging element 111 and the single second arranging element 121 is 6 mm to 7 mm, the total number of the first arranging elements 111 and the second arranging elements 121 is 7 or 8, and the total length of the second radiation structure 300 is 20 mm to 26 mm, so that the area of the NB-IOT antenna 1000 provided by the embodiment of the present application can be reduced to 30 mm × 10 mm (about 30% of the area of a conventional antenna), and the radiation of two frequency bands generated at the same time meets the requirement of NB-IOT.

Referring to fig. 5, the S-parameters of the dual-band NB-IOT antenna 1000 show the return loss properties of the antenna. The dual-frequency NB-IOT antenna 1000 provided by the application has the advantages that in the frequency ranges of 900MHz and 1800MHz, the values of S (1,1) parameters are less than or equal to-6 db, the lowest S (1,1) parameter can reach-12 db when the frequency is 900MHz, the lowest S (1,1) parameter can reach-9 db when the frequency is 1800MHz, and the return loss meets the requirement of NB-IOT in the frequency ranges of 900MHz and 1800 MHz.

Referring to fig. 1, the length direction of the substrate 500 is an x-axis, the width direction of the substrate 500 is a y-axis, and the thickness direction of the substrate 500 is a z-axis.

Referring to fig. 6a and 6b, the directional diagram of the NB-IOT antenna 1000 shows the omnidirectional radiation capability of the NB-IOT antenna 1000 at 900MHz frequency band. Fig. 6a shows the omnidirectional radiation capability of the NB-IOT antenna 1000 in the plane parallel to the x-axis and the y-axis, and fig. 6b shows the omnidirectional radiation capability of the NB-IOT antenna 1000 in the plane parallel to the y-axis and the z-axis, and the out-of-roundness of the pattern is within ± 1db in the plane parallel to the y-axis and the z-axis, so that the out-of-roundness of the pattern is good, the omnidirectional radiation in the direction perpendicular to the substrate 500 is ensured, and the NB-IOT requirement is met.

Referring to fig. 7a and 7b, the directional diagram of the NB-IOT antenna 1000 shows the omnidirectional radiation capability of the NB-IOT antenna 1000 at 1800 MHz. Fig. 7a shows the omnidirectional radiation capability of the NB-IOT antenna 1000 in the plane parallel to the x-axis and the y-axis, and fig. 7b shows the omnidirectional radiation capability of the NB-IOT antenna 1000 in the plane parallel to the y-axis and the z-axis, and in the direction perpendicular to the substrate 500, the out-of-roundness of the pattern is within ± 1db, and the out-of-roundness of the pattern is good, so that the omnidirectional radiation in the direction perpendicular to the substrate 500 is ensured, and the requirement of NB-IOT is met.

After the above technical solution is adopted, under the condition that the NB-IOT antenna 1000 is manufactured in the form of a PCB printed board and the antenna size is limited, the first array group 110 is disposed on the first surface 510 of the substrate 500, the second array group 120 is disposed on the second surface 520 of the substrate 500, so that the length of the first radiation structure 100 is longer in a limited size space, meanwhile, the first array group 110 is designed to be a combination of a plurality of first arrays 111, the second array group 120 is designed to be a combination of a plurality of second arrays 121, the first arrays 111 are electrically connected with the second arrays 121, and the first surface 510, the second surface 520 and the thickness of the substrate 500 are fully utilized, so that the first radiation structure 100 generates radiation in the 900MHz frequency band, and the size of the NB-IOT antenna 1000 is reduced. Meanwhile, a second radiation structure 300 is additionally arranged, and the second radiation structure 300 comprises a first radiation arm 310 and a second radiation arm 320 which are perpendicular to each other, so that the size of the NB-IOT antenna 1000 is reduced while the second radiation structure 300 generates radiation in a 1800MHz frequency band. Finally, the radiation emitted by the NB-IOT antenna 1000 has the characteristics of small return loss and good omnidirectional performance, and the two generated frequencies meet the requirements of NB-IOT. The dual-band NB-IOT antenna 1000 provided by the application has the advantages of small size, low return loss and good omnidirectional performance, and meets the NB-IOT requirements of two frequency bands of 900MHz and 1800 MHz.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of the application. The components and arrangements of specific examples are described above to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily 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.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A dual-band NB-IOT antenna, comprising:

a substrate having a first side and a second side;

2. The NB-IOT antenna of claim 1, further comprising a second radiating structure disposed on the first surface of the substrate and electrically connected to the second array, wherein the second radiating structure is bent to resonate at a second predetermined wobble frequency.

3. The NB-IOT antenna according to claim 2, wherein the first alignment members are spaced apart from each other along a length of the substrate; and/or the second arraying pieces are arrayed at intervals along the length direction of the substrate.

4. The NB-IOT antenna of claim 3, wherein the first arrangement includes a first arrangement arm and a second arrangement arm extending from one end of the first arrangement arm, and wherein the second arrangement includes a third arrangement arm and a fourth arrangement arm extending from one end of the third arrangement arm; the length of the first arrangement arm is greater than that of the second arrangement arm, and the length of the third arrangement arm is greater than that of the fourth arrangement arm;

5. The NB-IOT antenna of claim 4, wherein the first alignment arm is perpendicular to the second alignment arm; and/or the third arrangement arm is perpendicular to the fourth arrangement arm.

6. The NB-IOT antenna of claim 5, wherein the second alignment arm extends from one end of the first alignment arm toward a side away from the feed structure; and/or the fourth arrangement arm is bent and extended from one end of the third arrangement arm to one side far away from the feeding structure.

7. The NB-IOT antenna of claim 6, wherein the first tier arm is electrically connected to the fourth tier arm or the feed structure; and/or the second array arm is electrically connected to the third array arm; and/or the fourth array arm is electrically connected to the first array arm or the second radiating structure; and/or the number of the first arrangement elements is the same as the number of the second arrangement elements.

8. The NB-IOT antenna of claim 2, wherein the second radiating structure comprises:

a first radiating arm electrically connected to the second array;

9. The NB-IOT antenna of claim 1, further comprising a ground structure comprising a first ground plane and a second ground plane, the first ground plane disposed on the first side and the second ground plane disposed on the second side, the first ground plane and the second ground plane being in conductive communication via a plurality of connectors;

10. The NB-IOT antenna of claim 7, wherein the first predetermined fluctuation frequency is 900MHz and the second predetermined fluctuation frequency is 1800 MHz.