CN210838091U

CN210838091U - Bluetooth antenna and intelligent lock of using thereof

Info

Publication number: CN210838091U
Application number: CN201921359197.2U
Authority: CN
Inventors: 陈国强; 鲍伟
Original assignee: Dongguan Yijia Electronic Communication Technology Co ltd
Current assignee: Dongguan Yijia Electronic Communication Technology Co ltd
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2020-06-23
Anticipated expiration: 2029-08-21

Abstract

The utility model belongs to the technical field of the communication antenna, specifically be a bluetooth antenna and intelligent lock of using thereof. The utility model discloses a bluetooth antenna, including base plate, ground connection unit, excitation unit, coaxial line and return circuit groove, wherein: the grounding unit and the exciting unit are sequentially arranged on the substrate; the coaxial wire core wire welding points are fixed on the substrate, and the coaxial wire braid is fixed on the grounding unit through the coaxial wire braid welding points; the excitation unit is connected with the coaxial line core wire welding spot; the grounding unit, the exciting unit and the coaxial line form the loop slot. The utility model discloses bluetooth antenna's operating band is 2400 + 2500MHz, through installing the position of windowing at intelligent lock metal casing to can reduce antenna area greatly with metal lock body ground connection, guarantee that the antenna has good radiation performance.

Description

Bluetooth antenna and intelligent lock of using thereof

Technical Field

The utility model relates to a communication antenna technical field specifically is a bluetooth antenna and intelligent lock of using thereof.

Background

Along with the increasing popularization of intelligent house now, intelligent lock is as the entry of whole house intelligent house, and other intelligent equipment interconnection of family form the scene, can set up the scene linkage wantonly to the lock, give the more humanized functions of lock. The intelligent door lock is characterized in that the intelligent door lock is provided with an identity recognition concept through an electric execution mechanism, for example, fingerprint recognition unlocking, password unlocking, IC card unlocking, mobile phone APP temporary password unlocking, mechanical unlocking and other unlocking modes. Compared with the common door lock, the intelligent lock has the advantages of being more convenient and safer. In addition, after the technology of the internet of things is introduced, the intelligent door lock or the intelligent lock is innovated and reflected in the upgrading of user experience: more convenient, safer and more intelligent.

The wireless communication protocol suitable for the intelligent lock can be divided into short-distance wireless communication and long-distance wireless communication according to the transmission distance. The short-distance wireless communication protocols include Zigbee, 433, Bluetooth, WiFi and the like. The long-distance wireless communication protocols include NB-IoT, eMTC, LTE and the like. Generally, a short-distance wireless communication technology is adopted, wherein Bluetooth has the outstanding advantages of low power consumption, low cost, high safety and the like, and the Bluetooth wireless communication technology becomes an enthusiastic wireless scheme communication technology for intelligent door lock manufacturers. Bluetooth intelligence lock on the market all uses the dry battery power supply basically, and BLE bluetooth low energy module all has ultralow consumption under broadcasting, transmission, standby and sleep mode.

Because the protective shell adopts metal components, the position suitable for debugging the antenna can only be positioned on the front non-metal panel, but in the actual ID (Industrial Design), the front panel is mainly used for the purpose of a touch screen or a key, the area is limited, and if the antenna is arranged in the touch screen or the key area, the performance of the touch screen and the key can be influenced. Other parts of the lock body are covered by metal, so that most of intelligent door locks still adopt another mode, namely, windows are formed in the metal, and nonmetal materials such as acrylic and toughened glass are added to the outside so as to attach the antenna to the inside.

The antenna is debugged under the condition of metal windowing, the debugging environment is severe for the antenna, the front shell and the rear shell of the lock body are made of metal, only the antenna area is empty, and the efficiency and the gain of the antenna are required to be good enough. In order to ensure that the performance of the antenna is more excellent under the condition of being suitable for metal windowing, the problem to be solved urgently is to improve the antenna on the intelligent door lock.

SUMMERY OF THE UTILITY MODEL

For solving the problem that exists among the above-mentioned background art, the utility model aims at providing a bluetooth antenna and intelligent lock of using thereof, bluetooth antenna's operating band is 2400 + 2500MHz, through installing the position of windowing at intelligent lock metal casing to can reduce antenna area greatly with metal lock body ground connection, guarantee that the antenna has good radiation performance.

A first object of the present invention is to provide a bluetooth antenna, including base plate, ground element, excitation unit, coaxial line and return circuit groove, wherein: the grounding unit and the exciting unit are sequentially arranged on the substrate; the coaxial wire core wire welding spot is fixed on the substrate, and the coaxial wire braid is fixed on the grounding unit through the coaxial wire braid welding spot; the exciting unit is connected with the coaxial line core wire welding spot; the grounding unit, the exciting unit and the coaxial line form a loop slot.

Further, the ground unit includes a ground reference portion and a ground end portion, the exciting unit, the coaxial line, and the loop groove are located on an upper side of a center line of the substrate, and the ground reference portion is located on a lower side of the center line of the substrate.

Furthermore, the excitation unit comprises a first microstrip line and a second microstrip line, the first microstrip line is horizontally arranged, the second microstrip line is vertically arranged, the first end of the second microstrip line is connected with the first microstrip line, the second end of the second microstrip line is connected with the coaxial line core wire welding point, and the first microstrip line and the second microstrip line are connected to form an L-shaped excitation unit 4.

Further, the excitation unit generates resonance in the 2400-.

Furthermore, the impedance of the coaxial line is 50 ohms, the welding point of the core line of the coaxial line is a feeding point, the welding point of the braid layer of the coaxial line is a grounding point, and the free end of the coaxial line is connected with external equipment.

Preferably, the loop groove is rectangular in shape.

Preferably, the substrate is in a Z-shaped configuration with a planar dimension of 38.2mm by 19.0 mm.

Preferably, the substrate is a flexible printed circuit board.

A second object of the utility model is to provide an intelligent door lock, wherein, the position of windowing is reserved to intelligent door lock when the structure piles up, and a position department of windowing installs an above-mentioned arbitrary bluetooth antenna.

Further, the area of the windowing position is not less than 40-30 mm²。

Furthermore, the antenna is pasted on the metal shell of the intelligent door lock through the grounding unit and is grounded with the metal shell.

Compared with the prior art, the utility model discloses bluetooth antenna and intelligent lock's beneficial effect lies in:

the utility model discloses a bluetooth antenna can cover bluetooth's operating band 2400 supplyes 2500MHz, only need pile up at the structure and reserve well not less than 40mm 30mm on intelligent lock metal frame earlier stage²The window opening area can adopt the FPCB antenna mode in the embodiment, and the window opening area is convenient to install and has excellent performance.

Drawings

For a clearer explanation of the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view (a) of the overall structure of the bluetooth antenna of the present invention;

fig. 2 is a schematic view (ii) of the overall structure of the bluetooth antenna of the present invention;

fig. 3 is a return loss diagram of the bluetooth antenna of the present invention;

fig. 4 is a smith chart of the bluetooth antenna of the present invention;

fig. 5 is a voltage standing wave ratio diagram of the bluetooth antenna of the present invention;

fig. 6 is a data diagram of the efficiency test of the bluetooth antenna of the present invention;

the coaxial cable comprises a substrate 1, a clearance area 11, a coaxial line 2, a coaxial line 21, a coaxial line core wire welding spot 22, a coaxial line braid welding spot 3, a grounding unit 31, a grounding reference part 32, a grounding end part 4, an excitation unit 41, a first microstrip line 411, a first connecting point 42, a second microstrip line 42 and a loop slot 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the utility model provides a bluetooth antenna, including base plate 1, ground element 3, excitation unit 4, coaxial line 2 and return circuit groove 5, wherein: the grounding unit 3 and the exciting unit 4 are sequentially arranged on the substrate 1, and the grounding unit 3 is connected with the exciting unit 4; the coaxial wire core wire welding spot 21 is fixed on the substrate 1, and the coaxial wire braid is fixed on the grounding unit 3 through the coaxial wire braid welding spot 21; the exciting unit 4 is connected with a coaxial line core wire welding spot 21; the grounding unit 3, the exciting unit 4 and the coaxial line 2 form a loop slot 5, so that the antenna has the advantage of small size of a common antenna, and the design of the loop slot 5 can realize the auxiliary adjustment of bandwidth and impedance, thereby effectively improving the bandwidth and reducing the impedance.

Specifically, the grounding unit 3 includes a grounding reference part 31 and a grounding terminal part 32, the grounding reference part 31 is located at the lower left side of the substrate, the grounding terminal part 32, the loop slot 5, the excitation unit 4 and the coaxial line 2 are all located at the upper side of the substrate, and the grounding reference part 31, the grounding terminal part 32, the loop slot 5, the excitation unit 4 and the coaxial line 2 are all located at the front side of the substrate; the ground terminal portion 32 is connected to the exciting unit 4 via the first connecting point 411, the ground terminal portion 32 is a ground wire having a corner 180 degrees counterclockwise from the first connecting point 411, and a rectangular open-circuit groove is formed at the corner, and in the preferred embodiment, a groove is also formed at the connection point of the ground reference portion 32 and the ground terminal portion 32, and the coaxial wire solder point 21 is located in the groove.

Specifically, the excitation unit 4 includes a first microstrip line 41 and a second microstrip line 42, the first microstrip line 41 is horizontally disposed, a first end of the first microstrip line 41 is connected to the ground unit 3 (i.e., the ground terminal portion 32) through a first connection point, and a second end of the first microstrip line 41 is a free end; the second microstrip line 42 is vertically arranged, the second microstrip line 42 is located right below the first microstrip line 41 and is perpendicular to the first microstrip line 41, the second microstrip line 42 is located in the groove, the second end of the second microstrip line 42 is connected with the coaxial line core wire welding point 21, and the first microstrip line 41 and the second microstrip line 42 are connected to form the L-shaped excitation unit 4; preferably, the first microstrip line 41 and the second microstrip line 42 are both metal microstrip lines, a clearance area 11 is disposed on the substrate, and the first microstrip line 41 is located in the clearance area 11, so as to implement effective radiation of the antenna.

Specifically, this messenger utility model's bluetooth antenna during operation, excitation unit 4 produces 2400 and supplyes 2500MHz frequency channel's resonance, and work is in basic mode, receives the influence of antenna peripheral metal and antenna and metal in ground connection position 3 department ground connection, and resonance length will be shorter than 2400 and supplyes 2500MHz frequency channel intermediate frequency's quarter wavelength.

Specifically, the utility model discloses bluetooth antenna's coaxial line 2's impedance is 50 ohms, and coaxial line heart yearn solder joint 21 is the feed point, and coaxial line weaving layer solder joint 22 is the ground point, and coaxial line 2's free end is connected with external equipment.

Specifically, the open-circuit slot of the ground terminal portion 32, the second microstrip line 42, and the coaxial line form a loop slot 5, the loop slot 5 is substantially rectangular, the rectangular loop slot 5 is used to adjust the inductance of the antenna, and a monopole with a resonance length of one quarter wavelength passes through an inductive line between the feeding point and the ground point, so that the current flows back to the ground to achieve the effect of sensing the ground by the parallel connection, thereby matching 50 ohms impedance. Of course, the loop slot 5 may be set to other shapes as long as the present scheme can be implemented and all fall into the protection scope of the present invention.

This embodiment does not do the restriction to the material, thickness and the dielectric constant of dielectric substrate 1, because its material is relevant with the dielectric constant, so specifically choose to use by technical staff in the field under specific operation requirement, the preferred base plate 1 of this embodiment is flexible printed circuit board, thickness is about 0.1mm, the plane is the size 38.2mm 19.0mm, and base plate 1 is similar Z style of calligraphy structure, this structure makes the actual area of base plate 1 less, and then makes the bluetooth antenna size of this embodiment less, here is only to the specific restriction of dielectric substrate 1 the utility model discloses better a realization, to the restriction to the protection scope, technical staff in the field chooses dielectric substrate 1 of other materials to realize that the design of this scheme also falls into the protection scope of this embodiment.

The utility model discloses a bluetooth antenna has made corresponding design to the structure size of antenna, can design as the size of fig. 2 (the unit of all sizes is millimeter (mm) in the picture), and here is no longer repeated.

Another embodiment of the present invention provides an intelligent door lock, wherein a windowing position is reserved when the structure is stacked, and any one of the bluetooth antennas is installed at the windowing position; specifically, the area of the windowing position is not less than 40 × 30mm²The distance (namely the thickness of the intelligent door lock) between the antenna and the metal cover plate (namely the metal shell directly mounted on the door body) needs to be more than 40mm, and the influence of the environment on the antenna efficiency is small through verification, and the intelligent door lock is generalThe intelligent door lock can meet the condition.

Specifically, the antenna is pasted on the metal shell of the intelligent door lock through the grounding unit and is grounded with the metal shell, so that the metal shell also becomes a part of the antenna, and thus, the coaxial line can not be in contact with or not in contact with the metal shell during assembly, and the performance of the antenna is not deviated.

To the utility model discloses a performance test is carried out to bluetooth antenna, as shown in fig. 3, can reach-15 dB by this antenna of antenna device's return loss picture in 2400 supple with electricity 2500MHz frequency channel. As shown in fig. 4 and 5, the smith chart of the antenna device and the voltage standing wave ratio chart of the antenna device show that the antenna impedance matching is good. As shown in fig. 6, which is an efficiency test chart of the antenna, it can be seen that the antenna is applicable to the WIFI antenna frequency band 2400-.

The present invention has been further described with reference to specific embodiments, but it should be understood that the specific description herein should not be construed as limiting the spirit and scope of the present invention, and that various modifications to the above-described embodiments, which would occur to persons skilled in the art after reading this specification, are within the scope of the present invention.

Claims

1. The utility model provides a bluetooth antenna, its characterized in that includes base plate, ground element, excitation unit, coaxial line and return circuit groove, wherein:

the grounding unit and the exciting unit are both arranged on the substrate; the core wire welding points of the coaxial wires are fixed on the substrate, and the braided layers of the coaxial wires are fixed on the grounding unit through the coaxial wire braided layer welding points; the excitation unit is connected with the coaxial line core wire welding spot;

the grounding unit, the exciting unit and the coaxial line form the loop slot;

the grounding unit comprises a grounding reference part and a grounding end part, wherein the grounding end part, the exciting unit, the coaxial line and the loop groove are positioned on the upper side of the center line of the substrate, and the grounding reference part is positioned on the lower side of the center line of the substrate.

2. The bluetooth antenna according to claim 1, wherein the excitation unit comprises a first microstrip line and a second microstrip line, the first microstrip line is horizontally arranged, the second microstrip line is vertically arranged, a first end of the second microstrip line is connected with the first microstrip line, a second end of the second microstrip line is connected with the coaxial line core wire by a solder joint, and the first microstrip line and the second microstrip line are connected to form an L-shaped excitation unit.

3. The bluetooth antenna as claimed in claim 1, wherein the excitation unit generates resonances in the 2400-.

4. The bluetooth antenna according to claim 1, wherein the coaxial line has an impedance of 50 ohms, the coaxial line core wire solder joint is a feed point, the coaxial line braid solder joint is a ground point, and a free end of the coaxial line is connected to an external device.

5. The bluetooth antenna according to claim 1, wherein the loop slot is rectangular in shape.

6. The bluetooth antenna according to claim 1, wherein the substrate has a Z-shaped structure and a planar dimension of 38.2mm by 19.0 mm.

7. The bluetooth antenna according to claim 1, wherein the substrate is a flexible printed circuit board.

8. An intelligent door lock, characterized in that the intelligent door lock reserves a windowing position when structures are stacked, and the Bluetooth antenna of any one of claims 1-7 is installed at the windowing position.

9. The intelligent door lock of claim 8, wherein the windowed positionIs not less than 40 x 30mm²。

10. The intelligent door lock of claim 9, wherein the antenna is adhered to the metal shell of the intelligent door lock through a grounding unit and is grounded to the metal shell.