High-precision double-antenna for Bluetooth

Abstract

The double antenna comprises a left antenna and a right antenna, the left antenna and the right antenna are consistent in size, structure and shape, the left antenna comprises a radiation unit, the radiation unit is arranged in a winding form structure, the two sides of the front end of the radiation unit are bent inwards, the top of the rear end of the radiation unit is connected with a coaxial feeder line, and the coaxial feeder line is connected with the left antenna and the right antenna. Short-circuit metal sheets are connected to two sides of the bottom of the rear end of the radiation unit. According to the utility model, the left antenna and the right antenna are arranged in a winding form structure, so that the antenna size is smaller, and the radiation unit has good omnidirectivity, so that antenna working states in different scenes can be realized, and accurate positioning application scenes such as digital keys, intelligent tags, asset tracking and position service can be conveniently handled; and meanwhile, the single antenna can be flexibly configured to work independently to adapt to specific working requirements of radio frequency transceiving, so that the service space is expanded.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of bluetooth antenna, specifically related to a kind of double antenna for bluetooth high precision. BACKGROUND

[0002] Channel Sounding is mainly used to realize the safe and accurate ranging between two Bluetooth devices, and this technology estimates the distance by measuring the phase change of radio signal and signal round trip time, which significantly improves the positioning accuracy and stability.

[0003] In the Channel Sounding ranging process, antennas are needed to send and receive electromagnetic waves, and the recommended antenna path range of Bluetooth high-precision positioning system is 1-4, but the existing single-antenna system has the disadvantages of poor positioning effect due to multipath effect of electromagnetic wave transmission, complex algorithm, low antenna isolation, large occupied area and other shortcomings of three and four-antenna systems, so a double antenna for Bluetooth high precision is needed to solve the above problems. UTILITY MODEL CONTENTS

[0004] To solve the problems in the above background technology, the utility model aims to provide a double antenna for Bluetooth high precision.

[0005] To achieve the above technical purpose, the utility model adopts the following technical scheme:

[0006] A double antenna for Bluetooth high precision, comprising a left antenna and a right antenna, the left antenna and the right antenna are the same in size and structure, the left antenna comprises a radiation unit, the radiation unit is arranged in a meandering form, the front end of the radiation unit is bent inward on both sides, the top of the rear end of the radiation unit is connected with a coaxial feeder, and the bottom of the rear end of the radiation unit is connected with a short-circuit metal sheet on both sides.

[0007] Further limited, the left antenna and the right antenna are arranged on a PCB, and the included angle between the left antenna and the right antenna is 90°. Such structure design optimizes the port isolation and polarization diversity gain.

[0008] Further limited, the radiation unit is arranged in a planar structure. Such structure design improves the use effect.

[0009] Further limited, the front end and the bottom of the rear end of the radiation unit are provided with two through holes on both sides. Such structure design reserves the fixed position in the product.

[0010] Further limited, the top of the front end of the radiation unit is provided with an open slot on both sides. Such structure design optimizes the current distribution and bandwidth of the antenna.

[0011] The utility model discloses a beneficial effect is: the utility model discloses a left antenna and right antenna are in the form of structure of snail setting, make it have smaller antenna volume, and the radiation unit has good omni -directionality, realize the antenna working state under different scenes, adapt channel sounding and RSSI and other bluetooth technology demand, cope with digital key, intelligent label, asset tracking and the accurate positioning application scene such as location service, can independently work of single antenna flexible configuration, adapt the specific work demand of radio frequency transceiver, thereby expand the business space. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model discloses can be further explained by the non - limiting embodiment shown in the drawing;

[0013] Figure 1 For the mounting state structure schematic drawing of the utility model embodiment for bluetooth high accuracy's double antenna;

[0014] Figure 2 For the axle side structure schematic drawing of the utility model embodiment for bluetooth high accuracy's double antenna;

[0015] Figure 3 For the front structure schematic drawing of the utility model embodiment for bluetooth high accuracy's double antenna;

[0016] Figure 4 For the side structure schematic drawing of the utility model embodiment for bluetooth high accuracy's double antenna;

[0017] The main element symbol explanation is as follows:

[0018] Left antenna 1, radiation unit 101, coaxial feeder 102, short-circuit metal sheet 103;

[0019] Right antenna 2, PCB board 3, through -hole 4, open slot 5. DETAILED DESCRIPTION

[0020] In order to make those skilled in the art can better understand the utility model, the utility model technical scheme is further explained below with the drawings and examples.

[0021] As Figures 1-4 The utility model discloses a kind of double antennas for bluetooth high accuracy, including left antenna 1 and right antenna 2, left antenna 1 and right antenna 2 size structure shape are consistent, left antenna 1 includes radiation unit 101, radiation unit 101 is in the form of structure of snail setting, the front end both sides of radiation unit 101 are bent inward, the top of the rear end of radiation unit 101 is connected with coaxial feeder 102, the bottom of the rear end of radiation unit 101 is connected with short-circuit metal sheet 103.

[0022] Preferably, the left antenna 1 and the right antenna 2 are arranged on the PCB 3, and the included angle between the left antenna 1 and the right antenna 2 is 90°. Such a structure design optimizes the port isolation and polarization diversity gain. In fact, other mounting structure shapes of the left antenna 1 and the right antenna 2 can also be considered according to specific conditions.

[0023] Preferably, the radiation unit 101 is arranged in a planar structure. Such a structure design improves the use effect. In fact, other structure shapes of the radiation unit 101 can also be considered according to specific conditions.

[0024] Preferably, two through holes 4 are arranged on the bottom of the front end and the rear end of the radiation unit 101. Such a structure design reserves a fixed port in the product. In fact, other structure shapes of the through hole 4 can also be considered according to specific conditions.

[0025] Preferably, an open slot 5 is arranged on the top of the front end of the radiation unit 101. Such a structure design optimizes the current distribution and bandwidth of the antenna. In fact, other structure shapes of the open slot 5 can also be considered according to specific conditions.

[0026] In the embodiment, by taking the radiation unit 101 as a radiator, the resonance frequency and radiation characteristics of the antenna are optimized, the radiation unit 101 adopts a meandering form, the physical size and effective length of the antenna are optimized, the open slot 5 is arranged, the current distribution and bandwidth of the antenna are optimized, the PCB 3 is taken as a reflecting surface, the rear end of the radiation unit 101 is connected with the PCB 3 for grounding and feeding, the resonance characteristics and impedance of the antenna are optimized, the left antenna 1 and the right antenna 2 are arranged at a right angle of 90°, and the port isolation and polarization diversity gain are optimized.

[0027] According to the antenna design of the patent, the input impedance of any one of the left antenna 1 or the right antenna 2 is matched to 50 ohms, the input efficiency is greater than 60%, the input standing wave ratio in the 2.4G frequency band is less than 2, the antenna has a fixed propagation group delay and a linear propagation phase, and the difference between the maximum gains of the antenna in different channels is less than 2dB, and the isolation is greater than 18dB.

[0028] Meanwhile, the single antenna can also be flexibly configured to work independently, so as to adapt to specific working requirements of radio frequency transceiving, thereby expanding the business space.

[0029] The above embodiment only exemplarily illustrates the principle and effect of the utility model, and is not used to limit the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A dual antenna for Bluetooth high precision, characterized in that: It includes left antenna (1) and right antenna (2), the left antenna (1) and right antenna (2) size structure shape are consistent, the left antenna (1) includes radiation unit (101), the radiation unit (101) is arranged in the form of meandering structure, the front end both sides of the radiation unit (101) are bent inward, the rear end top of the radiation unit (101) is connected with coaxial feeder (102), the rear end bottom both sides of the radiation unit (101) are connected with short-circuit metal sheet (103).

2. The dual antenna for high precision Bluetooth according to claim 1, wherein: The left antenna (1) and right antenna (2) are arranged on the PCB board (3), and the included angle between the left antenna (1) and right antenna (2) is 90°.

3. The dual antenna for Bluetooth high precision according to claim 2, characterized in that: The radiation unit (101) is arranged in a planar structure.

4. The dual antenna for high precision Bluetooth according to claim 3, wherein: The front end and the rear end of the radiation unit (101) are provided with two through holes (4) on both sides of the bottom.

5. A dual antenna for Bluetooth high precision according to claim 4, characterized in that: The front end top of the radiation unit (101) is provided with open slot (5) on both sides.

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