CN215732185U

CN215732185U - Ultralow frequency antenna assembly

Info

Publication number: CN215732185U
Application number: CN202121375950.4U
Authority: CN
Inventors: 刘伟; 周鹏; 周路超
Original assignee: Shenzhen Electric Connector Technology Co Ltd
Current assignee: Shenzhen Electric Connector Technology Co Ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2022-02-01
Anticipated expiration: 2031-06-21

Abstract

The utility model discloses an ultra-low frequency antenna assembly which comprises a bracket module and a first antenna unit, wherein the first antenna unit comprises a feed input point, a first connecting part, a second connecting part and a third connecting part, the feed input point, the first connecting part, the second connecting part and the third connecting part are sequentially arranged, the first connecting part, the second connecting part and the third connecting part are positioned on a first side face of the bracket module, the second connecting part and the third connecting part are positioned on a second side face of the bracket module, and the first side face, the second side face and the top face are mutually vertical. The first antenna element further includes a first radiating arm located on a third side surface parallel to the first side surface and a second radiating arm shorter in length than the first radiating arm, the second radiating arm being located on the top surface. Compared with the prior art, the ultralow frequency antenna assembly disclosed by the utility model has the advantages of wide coverage range in low frequency band, wide application range, good performance, low cost and the like.

Description

Ultralow frequency antenna assembly

Technical Field

The utility model relates to the technical field of antennas, in particular to an ultralow frequency antenna assembly.

Background

The internet of things is an important component of a new generation of information technology, is an extended and expanded network on the basis of the internet, combines various information sensing devices with the network to form a huge network, and realizes the interconnection and intercommunication of people, machines and things at any time and any place. In practical application, some terminal devices of the internet of things are often placed in places with harsh environments or poor signal network coverage, such as basements, so that the terminal antennas of the internet of things have high requirements.

At present, the frequency bands of the terminal antenna of the internet of things are mainly focused on low frequencies, the requirement difference of different terminal antennas is large, and the antenna cost is increased due to the fact that the antennas are independently designed according to different frequency bands. Adopt external thing networking terminal antenna, though can suitably enlarge its application scope, reduce cost, nevertheless need extra space installation or set up external thing networking terminal antenna, unsatisfied the miniaturized development demand of current product, in addition, still can increase thing networking terminal equipment electromagnetic compatibility's risk.

Therefore, there is a need for an antenna assembly with a wide coverage area in a low frequency band, good performance and low cost.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an ultralow frequency antenna assembly, which has the advantages of wide coverage range in low frequency band, wide application range, good performance, low cost and the like.

In order to achieve the purpose, the utility model adopts the technical scheme that:

an ultra low frequency antenna assembly comprising a carrier module and a first antenna element disposed on the carrier module, wherein:

the first antenna unit comprises a feed input point, a first connecting part, a second connecting part and a third connecting part which are sequentially arranged, the first connecting part is positioned on a first side surface of the bracket module, the second connecting part is positioned on a top surface of the bracket module, the third connecting part is positioned on a second side surface of the bracket module, and the first side surface, the second side surface and the top surface are mutually vertical;

the first antenna element further comprises a first radiating arm and a second radiating arm, and the length of the first radiating arm is greater than that of the second radiating arm;

the first radiation arm is connected with the first connecting point on the third connecting part and is positioned on a third side surface of the bracket module, and the third side surface is parallel to the first side surface;

the second radiation arm is connected with a second connection point on the third connection part and is positioned on the top surface.

Preferably, the first antenna unit further includes a third radiating arm, and the third radiating arm is connected to a third connection point on the third connection portion and located on the third side.

Preferably, the length of the third radiating arm is smaller than that of the first radiating arm, the first radiating arm is in an unclosed annular structure, and the end of the third radiating arm is located inside the annular structure.

Preferably, the third connection point is located between the first connection point and the second connection point.

Preferably, the third radiation arm radiates a signal with a frequency of 790-832 MHz.

Preferably, the third connecting portion is in a U-shaped structure, that is, the third connecting portion extends downward at the second side surface, then extends along the bottom edge of the second side surface, and then extends upward.

Preferably, still including setting up second antenna element on the support module, second antenna element is including the tie point, the linking arm and the parasitic element that set gradually, the linking arm sets up on the first side, the parasitic element is located the top surface.

Preferably, the frequency of the radiation signal of the first radiation arm is 450-470 MHz.

Preferably, the frequency of the radiation signal of the second radiation arm is 880-960 MHz.

The utility model has the beneficial effects that: the first antenna unit is arranged on the plane which is adjacent to the bracket module and mutually vertical to each other, so that the arm lengths of the first radiating arm and the second radiating arm can be effectively prolonged, the low-frequency signal radiation performance of the first radiating arm and the second radiating arm is improved, the space utilization rate is high compared with a flat antenna or a rod antenna, the size of an antenna assembly can be effectively reduced, and the development requirement of product miniaturization is further favorably met; through setting up the first radiation arm and the second radiation arm that length is different, can effectively improve the scope that antenna module radiation signal covers the low frequency channel, and then help improving the application scope of ultralow frequency antenna module in thing networking terminal product, reduce cost.

Drawings

Fig. 1 is a schematic structural diagram of an ultra low frequency antenna assembly according to an embodiment of the present invention;

FIG. 2 is a schematic view of an alternative view of an ultra low frequency antenna assembly according to an embodiment of the present invention;

FIG. 3 is a schematic front view of an ultra low frequency antenna assembly in an embodiment of the utility model;

FIG. 4 is a schematic rear view of an ultra low frequency antenna assembly in an embodiment of the utility model;

FIG. 5 is a schematic top view of an ultra low frequency antenna assembly in an embodiment of the utility model;

fig. 6 is a schematic structural diagram of a first antenna unit and a second antenna unit according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a rack module according to an embodiment of the present invention

Fig. 8 is a schematic diagram of return loss characteristics (S11) of an ultra low frequency antenna assembly according to an embodiment of the present invention;

fig. 9 is a schematic diagram of the efficiency of the ultra low frequency antenna assembly in the embodiment of the present invention.

Reference numerals: 100. a bracket module; 110. a first side surface; 111. a groove structure; 112. a raised structure; 120. a top surface; 130. a second side surface; 140. a third side; 200. a first antenna element; 210. a feed input point; 220. a first connection portion; 230. a second connecting portion; 240. a third connecting portion; 241. a first connection point; 242. a second connection point; 243. a third connection point; 250. a first radiating arm; 260. a second radiating arm; 270. a third radiating arm; 300. a second antenna element; 310. a connection point; 320. a connecting arm; 330. a parasitic element.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

The embodiment of the application provides an ultralow frequency antenna assembly, solves the different incremental cost of thing networking terminal product built-in antenna structure among the prior art, adopts external antenna to be unfavorable for satisfying technical problem such as the miniaturized development demand of product again. In the present application, the lower, or lower side and the bottom refer to the direction in which the feeding input point and the substrate fixing position are located with respect to the rack module main body, and the opposite direction is the upper, or upper side and the top.

As shown in fig. 1 to 7, the embodiment of the present application:

an ultra low frequency antenna assembly includes a cradle module 100 and a first antenna unit 200 disposed on the cradle module 100. The first antenna element 200 includes a feed input point 210, a first connection part 220, a second connection part 230, and a third connection part 240, which are sequentially disposed. The first connecting portion 220 is located on the first side surface 110 of the rack module 100, the second connecting portion 230 is located on the top surface 120 of the rack module 100, the third connecting portion 240 is located on the second side surface 130 of the rack module 100, and the first side surface 110, the second side surface 130 and the top surface 120 are perpendicular to each other.

The first antenna element 200 further comprises a first radiating arm 250 and a second radiating arm 260, the length of the first radiating arm 250 being greater than the length of the second radiating arm 260. The first radiating arm 250 is connected to the first connecting point 241 on the third connecting portion 240, and is located on the third side 140 of the rack module 100, wherein the third side 140 is parallel to the first side 110. The second radiating arm 260 is connected to the second connection point 242 on the third connection portion 240 and is located on the top surface 120.

In order to solve the technical problems that the built-in antenna structure of the internet of things terminal product in the prior art is different and increases the cost, the external antenna is not beneficial to meeting the development requirement of product miniaturization, and the like, the first antenna unit is arranged on the plane which is adjacent to the bracket module and is mutually vertical to each other, the arm lengths of the first radiation arm and the second radiation arm can be effectively prolonged, the low-frequency signal radiation performance of the first radiation arm and the second radiation arm is improved, and compared with a flat-plate antenna or a rod-shaped antenna, the space utilization rate is high, the size of an antenna assembly can be effectively reduced, and the development requirement of product miniaturization is further favorably met; through setting up the first radiation arm and the second radiation arm that length is different, can effectively improve the scope that antenna module radiation signal covers the low frequency channel, and then help improving the application scope of ultralow frequency antenna module in thing networking terminal product, reduce cost.

Preferably, as shown in fig. 2 and 4, the first antenna element 200 further includes a third radiating arm 270, and the third radiating arm 270 is connected to the third connection point 243 on the third connection portion 240 and located on the third side surface 140. More specifically, the length of the third radiating arm 270 is smaller than that of the first radiating arm 250, the first radiating arm 250 has an open loop structure, and the end of the third radiating arm 270 is located inside the loop structure. Because the length of the third radiating arm 270 is smaller than that of the first radiating arm 250, and the length of the second radiating arm 260 is also smaller than that of the first radiating arm 250, the frequency of signals radiated by the third radiating arm 270 and the second radiating arm 260 is greater than that radiated by the first radiating arm 250, and the end of the third radiating arm 270 is arranged inside the non-closed loop structure formed by the first radiating arm 250, so that the interference of the radiated signals between the third radiating arm 270 and the second radiating arm 260 can be effectively reduced, and the performance of the ultra-low frequency antenna assembly is improved.

Preferably, as shown in fig. 2, the third connection point 243 is located between the first connection point 241 and the second connection point 242, so that the spatial size of the first antenna element 100 can be further reduced. The first radiating arm 250 extends upward along the bottom edge of the third side surface 140, and then is bent to form an unclosed annular structure surrounding the end of the third radiating arm 270, and at this time, the end of the first radiating arm 250 is located between the second radiating arm 260 and the third radiating arm 270, so that the space utilization rate of the first antenna unit 100 can be effectively improved, and the development requirement of product miniaturization is met.

Preferably, as shown in fig. 2, the third connecting portion 240 has a U-shaped structure, that is, the third connecting portion 240 extends downward on the second side 130, then reaches the bottom of the second side 130, then extends along the bottom of the second side 130 toward the third side 140, and then extends upward. The third connection part 240 is formed in a U-shaped structure, so that the size of the product can be reduced while the performance of the ultra low frequency antenna assembly is improved.

Preferably, the ultra low frequency antenna assembly further includes a second antenna unit 300, and the second antenna unit 300 is disposed on the stand module 100 and includes a connection point 310, a connection arm 320, and a parasitic element 330, which are sequentially disposed. The connecting arm 320 is disposed on the first side 110 and the parasitic element 330 is located on the top surface 120. The resonance occurs between the parasitic element 330 and the first antenna element 100, so that the performance of the ultra-low frequency antenna assembly can be effectively optimized, and the effective bandwidth of the ultra-low frequency antenna assembly can be widened.

Preferably, the frequency of the signal radiated by the first radiating arm 250 is 450-. The frequency of the signal radiated by the second radiating arm 260 is 880-960MHz band, which covers the low band B8 of LTE. The third radiating arm 270 radiates signals with frequencies of 790-832MHz band, covering the low band B20 of LTE. Currently, many communication systems exist in the field of terminal communication of the internet of things, wherein the communication systems with wider application ranges include LTE Category M1, LTE Category M2 (also referred to as Narrow-Band IoT (NB-IoT)), and the like, and in these protocols, signal frequency bands applied by typical terminal devices are mainly concentrated on B8, B20, B31, and B72. Therefore, the frequency of the radiation signal of the first radiation arm 250 is 450-470MHz, the frequency of the radiation signal of the second radiation arm 260 is 880-960MHz, and the frequency of the radiation signal of the third radiation arm 270 is 790-832MHz, which can be commonly used by the internet of things terminal devices with the application signal frequency bands of B8, B20, B31 and B72, thereby greatly improving the application range of the ultra-low frequency antenna assembly and effectively reducing the cost.

Preferably, as shown in fig. 3 and 7, the first side surface 110 includes a groove structure 111 and a protrusion structure 112, the first connection portion 220 of the first antenna unit 200 is disposed on the groove structure 111, and the connection arm 320 of the second antenna unit 300 is disposed on the protrusion structure 112, so that the arrangement not only can adjust the radiation area of the parasitic element 330 and improve the performance of the ultra low frequency antenna assembly, but also can help reduce the space volume of the stand module 100 and meet the development requirement of miniaturization of products. More specifically, in order to further reduce the spatial volume of the cradle module 100, the shape of the cradle module may be configured as the structure shown in fig. 7, the third side 140 has a larger effective area to ensure the reasonable layout of the first radiating arm 250, and the side opposite to the second side 130 and the part of the first side without antenna coverage may be reduced in volume by providing a groove, so as to reduce the spatial volume of the cradle module 100 and improve the spatial utilization rate of the ultra low frequency antenna assembly.

In one embodiment, the ultra low frequency antenna assembly is comprised of a cradle module 100, a first antenna unit 200, and a second antenna unit 300. The width of the groove structure 111 on the cradle module 100 is about 8.6mm, the width of the second side 130 is about 34.1mm, the length of the third side 140 is about 58.1mm, the height of the cradle module 100 is about 22.5mm, and the structures, shapes and relative positions of the first antenna unit 200 and the second antenna unit 300 are shown in fig. 1 and 2. The frequency of the signal radiated by the first radiation arm 250 is 450-470MHz, the frequency of the signal radiated by the second radiation arm 260 is 880-960MHz, and the frequency of the signal radiated by the third radiation arm 270 is 790-832 MHz. As shown in fig. 8 and fig. 9, the return loss characteristic (S11) parameter of the ultra-low frequency antenna assembly in the frequency range of 450-470MHz is less than-10 dB, the efficiency can reach more than-6 dB, the average value of the S11 parameter in the frequency range of 790-960MHz is less than-10 dB, and the efficiencies can reach more than-5 dB. The ultra-low frequency antenna component not only covers a wider low frequency band, but also has good antenna performance.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An ultra low frequency antenna assembly, comprising a carrier module and a first antenna element disposed on the carrier module, wherein:

2. The ultra low frequency antenna assembly of claim 1, wherein: the first antenna unit further comprises a third radiation arm, and the third radiation arm is connected with a third connection point on the third connection portion and located on the third side face.

3. The ultra low frequency antenna assembly of claim 2, wherein: the length of the third radiating arm is smaller than that of the first radiating arm, the first radiating arm is in an unclosed annular structure, and the end of the third radiating arm is located inside the annular structure.

4. The ultra low frequency antenna assembly of claim 3, wherein: the third connection point is located between the first connection point and the second connection point.

5. The ultra low frequency antenna assembly of claim 2, wherein: the frequency of the radiation signal of the third radiation arm is 790-832 MHz.

6. The ultra low frequency antenna assembly of any one of claims 1 to 4, wherein: the third connecting part is of a U-shaped structure, namely, the third connecting part extends downwards at the second side surface, then extends along the bottom edge of the second side surface and then extends upwards.

7. The ultra low frequency antenna assembly of claim 1, wherein: still including setting up second antenna element on the support module, second antenna element is including the tie point, the linking arm and the parasitic unit that set gradually, the linking arm sets up on the first side, the parasitic unit is located the top surface.

8. The ultra low frequency antenna assembly of claim 1, wherein: the frequency of the radiation signal of the first radiation arm is 450-470 MHz.

9. The ultra low frequency antenna assembly of claim 1, wherein: the frequency of the radiation signal of the second radiation arm is 880-960 MHz.