CN107394383B

CN107394383B - Slot plane inverted L antenna and blue tooth communication device

Info

Publication number: CN107394383B
Application number: CN201710677013.6A
Authority: CN
Inventors: 张世磊
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2017-08-09
Filing date: 2017-08-09
Publication date: 2023-09-15
Anticipated expiration: 2037-08-09
Also published as: CN107394383A

Abstract

The application discloses a slot plane inverted L antenna and a Bluetooth communication device. The slot plane inverted-L antenna comprises a substrate and an antenna body arranged on the substrate, wherein the antenna body comprises a feed conductor, a short-circuit conductor and a radiation conductor; the first end of the feed conductor is connected with an antenna signal feed point of the substrate, and the first end of the short circuit conductor is connected with the grounding surface of the substrate; the second end of the feed conductor is connected with the second end of the short-circuit conductor through a first connecting point, and the radiation conductor is connected with the feed conductor and the short-circuit conductor through the first connecting point; an antenna slot is formed between the short-circuit conductor, the feed conductor and the ground plane of the substrate. The antenna can effectively improve the bandwidth and reduce the impedance.

Description

Slot plane inverted L antenna and blue tooth communication device

Technical Field

The application relates to the field of communication devices, in particular to a slot plane inverted-L antenna and a Bluetooth communication device.

Background

In order to realize information transmission through space, an antenna device is needed for an electronic product with a wireless receiving and transmitting function. In order to meet the miniaturization requirement of electronic products, antenna performance is to be improved in a limited layout space. Typical antenna forms currently used in small electronic products include: 1) A half-wave dipole antenna; 2) Loop antenna; 3) A PATCH antenna; 4) An IFA antenna; 5) A PIFA antenna; 6) Monopole inverted-L antenna. The total length of the half-wave dipole antenna is half-wavelength, and the volume is larger; the length of the Loop antenna from the feed point to the place is half wavelength, and the volume is large; the PATCH antenna adopts a planar monopole antenna on a ceramic medium, so that the volume is large; the IFA antenna is added with a short-circuit conductor on the basis of a monopole antenna, has small volume and easy matching, but has narrower bandwidth; the PIFA antenna is based on the IFA antenna, the radiation conductor is changed into a planar structure, but the bandwidth is also narrower; the monopole inverted-L antenna is quarter wavelength long, and although small, is not easily matched because of small impedance.

Disclosure of Invention

The application provides a small-size wide-bandwidth slot plane inverted-L antenna and a Bluetooth communication device.

In order to achieve the above purpose, the present application adopts the following technical scheme:

according to one aspect of the present application, there is provided a slot planar inverted-L antenna, comprising a substrate and an antenna body disposed on the substrate, the antenna body comprising a feed conductor, a short-circuit conductor and a radiation conductor; the first end of the feed conductor is connected with an antenna signal feed point of the substrate, and the first end of the short circuit conductor is connected with the grounding surface of the substrate; the second end of the feed conductor is connected with the second end of the short-circuit conductor through a first connecting point, and the radiation conductor is connected with the feed conductor and the short-circuit conductor through the first connecting point; an antenna slot is formed between the short-circuit conductor, the feed conductor and the ground plane of the substrate.

Further, the feed conductor is L-shaped after being connected to the short-circuit conductor.

Further, the antenna body further comprises an overhead conductor, a first end of the overhead conductor is connected with the first connection point, and a second end of the overhead conductor is connected with the radiation conductor.

Further, the radiation conductors are parallel to the substrate.

Further, the overhead conductor is perpendicular to the substrate.

Further, the second end of the overhead conductor is connected to the end of the first end of the radiating conductor, the second end of the radiating conductor being open-circuited.

Further, the radiating conductor is parallel to the shorting conductor.

Further, the width of the antenna slot is less than or equal to 1mm.

Further, the substrate is a PCB board.

The application also provides a Bluetooth communication device, which comprises the slot plane inverted-L antenna.

In summary, according to the slot plane inverted-L antenna and the bluetooth communication device of the present application, the antenna body is disposed on the substrate, and the antenna slot is formed between the short-circuit conductor, the feed conductor and the ground plane of the substrate, so that the antenna slot realizes the auxiliary adjustment of bandwidth and impedance, thereby effectively improving bandwidth and reducing impedance. The antenna of the application has the size of about one quarter wavelength, the volume of the antenna is equivalent to that of a common IFA antenna, and the antenna has the advantage of small volume.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 is a schematic structural diagram of an embodiment of a slot planar inverted-L antenna according to the present application;

fig. 2 is a schematic structural dimension of an embodiment of a slot plane inverted-L antenna according to the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the present application provides an antenna slot plane inverted L antenna (i.e., slot planar inverted L antenna, for short, a SPILA antenna), comprising a substrate and an antenna body disposed on the substrate, wherein the antenna body comprises a feed conductor 10, a short-circuit conductor 30 and a radiation conductor 20; a first end of the feed conductor 10 is connected with an antenna signal feed point of the substrate, and a first end of the short-circuit conductor 30 is connected with a ground plane of the substrate; the second end of the feed conductor 10 is connected to the second end of the short-circuit conductor 30 via a first connection point B, and the radiating conductor 20 is connected to the feed conductor 10 and the short-circuit conductor 30 via a first connection point B; an antenna slot 50 is formed between the short-circuit conductor 30, the feed conductor 10 and the ground plane of the substrate. Namely, the antenna body is arranged on the substrate, and the antenna slot 50 is formed among the short circuit conductor 30, the feed conductor 10 and the ground plane of the substrate, so that the antenna slot 50 realizes the auxiliary adjustment of bandwidth and impedance, thereby effectively improving the bandwidth and reducing the impedance. The antenna of the application has the size of about one quarter wavelength, the volume of the antenna is equivalent to that of a common IFA antenna, and the antenna has the advantage of small volume.

As shown in fig. 1, the substrate may be a PCB board, on which the feed conductor 10 and the short-circuit conductor 30 are printed, are perpendicular to each other, and are connected to form an L-shape, thereby enclosing a regular antenna slot 50. Generally, the width of the antenna slot 50 is less than or equal to the width of the feed conductor 10, thereby increasing the bandwidth and decreasing the impedance. Preferably, the antenna slot 50 has a width of less than or equal to 1mm, which is advantageous for efficiency.

Preferably, as shown in connection with fig. 1 and 2, the antenna body further comprises an overhead conductor 40, a first end of the overhead conductor 40 being connected to the first connection point B, and a second end of the overhead conductor 40 being connected to the radiating conductor 20. The overhead conductor 40 breaks the radiating conductor 20 out of the plane of the substrate, thereby overhead the radiating conductor 20 and improving the headroom of the radiating conductor 20. The headroom distance of the radiating conductor 20 is adjusted by adjusting the length of the overhead conductor 40. Specifically, the second end of the overhead conductor 40 is connected to the end of the first end of the radiation conductor 20, the second end of the radiation conductor 20 is open-circuited, and impedance and bandwidth adjustment is achieved by adjusting the length and width of the radiation conductor 20 and the connection position with the overhead conductor 40. Generally, the overhead conductor 40 is perpendicular to the substrate, the radiation conductor 20 is parallel to the substrate, and the radiation conductor 20 is also parallel to the short-circuit conductor 30, thereby forming a regular shape.

Referring to fig. 1, the feed conductor 10 has a length L1 and a width W1; the antenna slot 50 is L1 long and S1 wide; the short-circuit conductor 30 has a length S1 and a width W2; the length of the overhead conductor 40 is L2, and the width is W3; the length of the radiation conductor 20 is L3, the width is W4, and the feeding of the antenna is realized through the feeding conductor 10; the auxiliary adjustment of the impedance and the bandwidth is realized by adjusting the L1 and the S1 of the antenna slot 50; impedance and bandwidth adjustment is achieved by adjusting L3 and W4 of the radiating conductor 20, and its connection location with the overhead conductor 40; the clearance area of the antenna is improved by increasing the L2 of the overhead conductor 40. The SPILA antenna designed by the patent can be widely applied to the field of various electronic products with wireless transceiver module functions, and is beneficial to miniaturization of products and improvement of antenna performance.

As shown in fig. 1 and 2, the present application is specifically illustrated with an SPILA antenna operating in the bluetooth band. The antenna can be used for intelligent bracelet products with Bluetooth function.

As shown in fig. 2, the length L1 of the feed conductor 10 is 3mm, the width W1 is 1mm, and one end thereof is connected to the antenna signal feed point of the substrate (as shown by reference symbol a in fig. 1 and 2); the length L1 of the antenna slot 50 is equal to the length of the feed conductor 10, the width S1 is 0.7mm, and the antenna slot 50 is surrounded by the feed conductor 10, the ground plane of the substrate and the short-circuit conductor 30. The length S1 of the short-circuit conductor 30 is equal to the width of the antenna slot 50, the width W2 of the short-circuit conductor 30 is equal to 1mm, one end of the short-circuit conductor 30 is connected with the signal feed point (shown as a reference sign B in fig. 1), and the other end of the short-circuit conductor is connected with the ground plane of the substrate (shown as a reference sign C in fig. 1); the substrate provides a signal feed point and a reference ground plane for the antenna; the length L2 of the overhead conductor 40 is equal to 3mm, and the width W3 is equal to 1mm; the length L3 of the radiation conductor 20 is equal to 20mm and the width W4 is equal to 1mm. One end of the radiation conductor 20 is connected to the overhead conductor 40 and is connected at the edge of the conductor, the connection point being shown as reference D in fig. 1, and the other end of the radiation conductor 20 being in an open state. The size of the SPILA antenna is about one quarter wavelength, the antenna is used for intelligent watch products, the average hand-mode efficiency (the efficiency of the intelligent watch worn on an arm) in 2402 MHz-2480 MHz frequency band is 18%, the bandwidth of standing wave <2.0 is 110MHz, and compared with the prior art, the performance of the antenna can be effectively improved.

The foregoing is merely a specific embodiment of the application and other modifications and variations can be made by those skilled in the art in light of the above teachings. It is to be understood by persons skilled in the art that the foregoing detailed description is provided for the purpose of illustrating the application more fully, and that the scope of the application is defined by the appended claims.

Claims

1. The slot plane inverted-L antenna comprises a substrate and an antenna body arranged on the substrate, and is characterized in that the antenna body comprises a feed conductor, a short-circuit conductor and a radiation conductor;

the first end of the feed conductor is connected with an antenna signal feed point of the substrate, and the first end of the short-circuit conductor is connected with the grounding surface of the substrate;

the second end of the feed conductor is connected with the second end of the short-circuit conductor through a first connecting point, and the radiation conductor is connected with the feed conductor and the short-circuit conductor through a first connecting point;

an antenna slot is formed among the short-circuit conductor, the feed conductor and the ground plane of the substrate.

2. The slot planar inverted-L antenna of claim 1, wherein,

the feed conductor is L-shaped after being connected with the short circuit conductor.

3. The slot planar inverted-L antenna of claim 1, wherein,

the antenna body further comprises an overhead conductor, a first end of the overhead conductor is connected with the first connection point, and a second end of the overhead conductor is connected with the radiation conductor.

4. The slot planar inverted-L antenna as claimed in claim 3, wherein,

the radiation conductors are parallel to the substrate.

5. The slot planar inverted-L antenna as claimed in claim 3, wherein,

the overhead conductor is perpendicular to the substrate.

6. The slot planar inverted-L antenna as claimed in claim 3, wherein,

the second end of the overhead conductor is connected with the end part of the first end of the radiation conductor, and the second end of the radiation conductor is open-circuited.

7. The slot planar inverted-L antenna of any one of claims 1-6, wherein,

the radiating conductor is parallel to the shorting conductor.

8. The slot planar inverted-L antenna of claim 1, wherein,

the width of the antenna slot is less than or equal to 1mm.

9. The slot planar inverted-L antenna of claim 1, wherein,

the substrate is a PCB.

10. A bluetooth communication device comprising an antenna, wherein the antenna is a slot plane inverted-L antenna according to any one of claims 1 to 9.