CN212810544U

CN212810544U - Antenna device for Bluetooth angle positioning

Info

Publication number: CN212810544U
Application number: CN202021477554.8U
Authority: CN
Inventors: 罗云
Original assignee: Shenzhen Xinghang Wulian Science And Technology Co ltd
Current assignee: Shenzhen Xinghang Wulian Science And Technology Co ltd
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2021-03-26
Anticipated expiration: 2030-07-23

Abstract

The utility model provides an antenna device for bluetooth angle location, including circular dielectric slab, be equipped with on the circular dielectric slab with the concentric public metal ground of circular dielectric slab and from three antenna element that extends of public metal ground, and three the antenna element evenly distributes around public metal ground; the antenna unit comprises two oscillators, a gap is formed between the two oscillators and is symmetrical relative to the gap, each oscillator comprises a first arm and a second arm, one end of each first arm is connected with the common metal ground, and the other end of each first arm is connected with the second arm; any one of the two vibrators is connected with a core wire of a coaxial cable, the other vibrator is connected with a shielding layer of the coaxial cable, and the coaxial cable part arranged between the two vibrators is inclined to the first arm.

Description

Antenna device for Bluetooth angle positioning

Technical Field

The utility model relates to a wireless transmission field especially relates to an antenna device for bluetooth angular positioning.

Background

Bluetooth angle of arrival (AoA) is a technology for performing positioning by phase difference of signals received by two or more antenna units, in order to reduce measurement error, a plurality of antenna units are usually provided for positioning, a certain isolation requirement exists between the antenna units, and when a plurality of antenna units exist, the minimum isolation is required to be not less than the specified isolation requirement; the conventional antenna unit arrangement mode can cause the structural size of the antenna device to be overlarge, so that the antenna device with a smaller structure on the premise of meeting the requirement of isolation is needed.

SUMMERY OF THE UTILITY MODEL

The utility model provides an antenna device for bluetooth angular positioning, the structure is less relatively under the prerequisite that satisfies the antenna element isolation.

Further, the included angle between the coaxial cable and the first arm is 30 degrees.

Furthermore, the second arm is of an arc-shaped structure and is attached to the edge of the circular dielectric slab.

The length of the short-circuit rod is L, the short-circuit ring is sleeved at the L distance position of the shielding layer of the coaxial cable close to one side of the second arm, one end of the short-circuit rod is connected with the short-circuit ring, and the other end of the short-circuit rod is connected with the oscillator connected with the core wire of the coaxial cable; where L is a quarter wavelength of the frequency of the current through the coaxial cable.

Further, the circular dielectric plate is made of an FR4 plate material, and the dielectric constant is 4.4.

The utility model discloses a be equipped with three antenna element on the dielectric plate, and three antenna element centers on public metallikon evenly distributed, so that three the mutual distance in gap equals, and the spatial distance between two arbitrary antennas promptly equals for satisfying, and the isolation between two arbitrary antennas is unanimous under the condition of not considering other factors, and under the prerequisite that satisfies the isolation requirement, corresponding device structure size is less than other antenna array's the mode that sets up relatively.

Drawings

Fig. 1 is an overall schematic diagram of an embodiment provided by the present invention.

Fig. 2 is a schematic structural diagram of the antenna unit of the embodiment of fig. 1.

FIG. 3 is a schematic diagram of AOA measurement calculation.

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 embodiments of the present invention, 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 of ordinary skill in the art without creative efforts belong to the protection scope of the present invention. It is to be understood that the drawings are designed solely for the purposes of illustration and description and not as a definition of the limits of the invention. The connection relationships shown in the drawings are for clarity of description only and do not limit the manner of connection.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; either mechanically or electrically, and may be internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

It should be further noted that in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1, the present invention provides an antenna device 100 for bluetooth angle positioning, including a circular dielectric plate 10, wherein a common metal ground 11 concentric with the circular dielectric plate 10 and three antenna units extending from the common metal ground 11 are disposed on the circular dielectric plate 10, and the three antenna units are uniformly distributed around the common metal ground 11; the antenna unit comprises two vibrators 40, a gap is formed between the two vibrators 40 and is symmetrical relative to the gap, each vibrator 40 comprises a first arm and a second arm, one end of each first arm is connected with the common metal ground 11, and the other end of each first arm is connected with the second arm.

In this embodiment, three antenna units are arranged on the dielectric plate, and the three antenna units are uniformly distributed around the common metal ground 11, so that the distances between the three slots are equal, that is, the spatial distances between any two antennas are equal, the isolation between any two antennas is consistent under the condition that other factors are not considered, and on the premise that the requirement of the isolation is met, the corresponding device structure size is smaller than that of other antenna arrays.

On the other hand, three antenna elements uniformly distributed along the common metal ground 11 are arranged, that is, the three antenna elements are distributed on the circular dielectric plate 10 in a triangular manner; calculating AOA by using the phase difference between any two antenna units (as shown in fig. 3), three different groups of antenna arrays (one group is formed by two antenna units) may be formed, and when receiving signals, two antenna units are located in the same radial direction, the other two groups may be selected as data for calculating AOA.

In the present embodiment, one of the two vibrators 40 is connected to the core wire 20 of the coaxial cable, and the other vibrator is connected to the shield layer 30 of the coaxial cable; preferably, the coaxial cable portion disposed between the two elements 40 is inclined to the first arm to avoid interference with the antenna signal when the two are perpendicular to each other.

Preferably, the coaxial cable forms an angle of 30 degrees with the first arm.

Preferably, the second arm has an arc-shaped structure and is attached to the edge of the circular dielectric plate 10, so as to save the structural size of the circular dielectric plate 10, and further reduce the size of the antenna device 100.

Specifically, the circular dielectric board 10 is made of FR4 plate material, and has a dielectric constant of 4.4.

Referring to fig. 2, the antenna device 100 further includes a short-circuit ring 22 and a short-circuit rod 23, the length of the short-circuit rod 23 is L, the short-circuit ring 22 is sleeved at a distance L from the shielding layer 30 of the coaxial cable near the second arm, one end of the short-circuit rod 23 is connected to the short-circuit ring 22, and the other end of the short-circuit rod is connected to the oscillator 40 connected to the core wire 20 of the coaxial cable; where L is a quarter wavelength of the frequency of the current through the coaxial cable.

By providing a short circuit loop, the high frequency current flowing through the outer sheath of the shield layer 30 of the coaxial cable is cut off to realize the balance-unbalance conversion.

Throughout the description and claims of this application, the words "comprise/comprises" and the words "have/includes" and variations of these are used to specify the presence of stated features, values, steps or components but do not preclude the presence or addition of one or more other features, values, steps, components or groups thereof.

Some features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, certain features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable combination in different embodiments.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be included in the present invention.

Claims

1. An antenna device for Bluetooth angle positioning is characterized by comprising a circular dielectric slab, wherein a common metal ground concentric with the circular dielectric slab and three antenna units extending from the common metal ground are arranged on the circular dielectric slab, and the three antenna units are uniformly distributed around the common metal ground; the antenna unit comprises two oscillators, a gap is formed between the two oscillators and is symmetrical relative to the gap, each oscillator comprises a first arm and a second arm, one end of each first arm is connected with the common metal ground, and the other end of each first arm is connected with the second arm; any one of the two vibrators is connected with a core wire of a coaxial cable, the other vibrator is connected with a shielding layer of the coaxial cable, and the coaxial cable part arranged between the two vibrators is inclined to the first arm.

2. The antenna device according to claim 1, wherein the coaxial cable is angled at 30 degrees from the first arm.

3. The antenna device according to claim 1, wherein the second arm has an arc-shaped structure and is attached to an edge of the circular dielectric plate.

4. The antenna device according to claim 1, further comprising a short-circuit ring and a short-circuit bar, wherein the length of the short-circuit bar is L, the short-circuit ring is sleeved on the shielding layer of the coaxial cable at a distance L from the second arm, one end of the short-circuit bar is connected to the short-circuit ring, and the other end of the short-circuit bar is connected to the oscillator connected to the core wire of the coaxial cable; where L is a quarter wavelength of the frequency of the current through the coaxial cable.

5. The antenna device according to claim 1, wherein the circular dielectric plate is made of FR4 plate material and has a dielectric constant of 4.4.