WO2021063106A1

WO2021063106A1 - Antenna and bluetooth wireless earphone

Info

Publication number: WO2021063106A1
Application number: PCT/CN2020/107235
Authority: WO
Inventors: 张俊宏; 范毅; 隆仲莹
Original assignee: 华为技术有限公司
Priority date: 2019-09-30
Filing date: 2020-08-05
Publication date: 2021-04-08
Also published as: CN112582779A; CN112582779B

Abstract

Provided in the embodiments of the present application are an antenna and a Bluetooth wireless earphone, relating to the technical field of communication devices, the antenna being arranged in the Bluetooth wireless earphone, an outer shell of the Bluetooth wireless earphone comprising an ear handle part, an ear plug part, and a corner part, a first circuit board being arranged in the ear plug part, and a second circuit board being arranged in the ear handle part; the antenna comprises a first antenna arm, the first antenna arm being laid on the first circuit board, and a second antenna arm, the second antenna arm being laid on the second circuit board, the first antenna arm and the second antenna arm both being connected to a transceiver by means of a feed structure; the antenna and the Bluetooth wireless earphone provided in the embodiments of the present invention do not require a separately arranged structure for arranging the first antenna arm and the second antenna arm, simplifying the structure and saving the space occupied by the structure; using the present antenna in the Bluetooth wireless earphone can effectively reduce the volume of the Bluetooth wireless earphone, such that the Bluetooth wireless earphone meets the requirements for the miniaturised design of electronic devices.

Description

Antenna and Bluetooth wireless earphone

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office on September 30, 2019 with the application number 201910944463.6 and the invention title is "An antenna and Bluetooth wireless headset", the entire content of which is incorporated into this application by reference .

Technical field

This application relates to the technical field of communication equipment, and in particular to an antenna and a Bluetooth wireless headset.

Background technique

At present, the antennas in True Wireless Stereo (TWS) headsets mostly use ceramic antennas, laser direct structuring (LDS antennas) or steel sheet antennas (Flexible Printed Circuit Board, FPC antennas). Since the LDS antenna uses a laser to irradiate the antenna on the bracket, its use range far exceeds that of ceramic antennas and FPS antennas. Generally, LDS antennas use monopole antennas.

The structure shown in Figure 1 is a commonly used structure for TWS earphones in the prior art. Due to the small size of the TWS earphone but the large number of components, the internal space of the product is tight. The antenna bracket 001 with the LDS antenna of the TWS earphone is set on the ear handle of the earphone. At the top, the antenna bracket 001 is connected to the RF terminal on the circuit board 003 through the feed structure 002, which will cause the earphone to form a protrusion for accommodating the antenna bracket 003 at the top of the ear handle, so that the entire TWS earphone The increased volume of the electronic products deviates from the miniaturization design requirements of electronic products. At the same time, according to the headform antenna pattern, there is a gain zero point in the antenna radiation direction outside the headform, that is, there is uneven signal coverage, which affects the communication experience.

Summary of the invention

The embodiments of the application provide an antenna and a Bluetooth wireless headset. The main purpose is to provide an antenna laid on a circuit board in the Bluetooth wireless headset to reduce the size of the Bluetooth wireless headset and make the Bluetooth wireless headset meet the miniaturization design. Claim.

In order to achieve the foregoing objectives, the embodiments of the present application adopt the following technical solutions:

In a first aspect, the present application provides an antenna, the antenna is arranged in a Bluetooth wireless headset, the housing of the Bluetooth wireless headset includes an ear handle, an ear plug, and a corner connecting the ear handle and the ear plug Part, the earplug part is provided with a first circuit board, the ear handle part is provided with a second circuit board, and the antenna includes:

A first antenna arm, where the first antenna arm is laid on the first circuit board;

A second antenna arm, where the second antenna arm is laid on the second circuit board;

Feeding structure, the first antenna arm and the second antenna arm are respectively connected to the transceiver through the feeding structure.

In the antenna provided by the embodiment of the present application, since the first antenna arm of the antenna is laid on the first circuit board, the second antenna arm is laid on the second circuit board. That is to say, the first antenna arm is arranged along the extension direction of the first circuit board, and the second antenna arm is arranged along the extension direction of the second circuit board. This makes full use of the space between the first circuit board and the second circuit board. In the prior art, under the premise of ensuring that the antenna can effectively transmit and receive signals, there is no need to separately provide a bracket for laying out the first antenna arm and the second antenna arm, which simplifies the structure and saves the space occupied by the bracket. The antenna used in the Bluetooth wireless headset will effectively reduce the volume of the Bluetooth wireless headset, so that the Bluetooth wireless headset can meet the miniaturization design requirements of electronic devices.

In a possible implementation manner of the first aspect, a first ground line, a first power supply line, and a first signal line are formed on the first circuit board, and the first ground line is used to provide power to the first power supply line and the first signal line. The first signal line provides a reference ground, the first ground line is the first antenna arm, and a second ground line, a second power supply line, and a second signal line are formed on the second circuit board. The second ground line is used to provide a reference ground for the second power supply line and the second signal line, and the second ground line is the second antenna arm. The first ground wire is used as the first antenna arm, and the second ground wire is used as the second antenna arm. There is no need to separately set radiation layers on the first circuit board and the second circuit board to form the first antenna arm and the second antenna. The arm simplifies the structure, which saves the space occupied by the radiating layer on the corresponding first circuit board and the second circuit board, reduces the size of the first circuit board and the second circuit board, and makes the antenna Used in the Bluetooth wireless headset, it will further reduce the size of the Bluetooth wireless headset.

In a possible implementation manner of the first aspect, the first ground wire is isolated from the reference ground of the components in the earplug portion by a first isolation structure, and the first isolation structure is used to prevent the first ground wire from being The radio frequency signal is transmitted to the reference ground of the components in the earplug portion, and the second ground wire is isolated from the reference ground of the components in the ear stem by a second isolation structure, and the second isolation structure is used to prevent The radio frequency signal on the second ground wire is transmitted to the reference ground of the components in the ear handle. The use of the first isolation structure and the second isolation structure can prevent the radio frequency signal from being transmitted to the corresponding reference ground, which will further improve the signal transmission effect of the antenna.

In a possible implementation of the first aspect, the first isolation structure includes a first inductor connected in series with the first ground line, and the second isolation structure includes a second inductor connected in series with the second ground line. inductance. The first inductor and the second inductor are used as an isolation structure, so that the Bluetooth high-frequency signal cannot pass, but the low-frequency signal transmitted to the reference ground can pass.

In a possible implementation manner of the first aspect, the first ground wire and the second ground wire are connected as an integral structure, the transceiver is provided on the second circuit board, and an extension ground is provided in the corner portion. One end of the extended ground wire is connected to the second ground wire, the other end is connected to the radio frequency port of the transceiver, and the first ground wire is connected to the ground port of the transceiver. In specific implementation, the existing first ground wire and the second ground wire generally have an integrated structure. The second ground wire is connected to the radio frequency port of the transceiver by using an extended ground wire, and the first ground wire is connected to the ground port of the transceiver. In this way, there is no need to interrupt the first ground wire and the second ground wire that are integrally connected, and the integrity of the ground wire that is an integral structure is guaranteed. And the extended ground wire is set in the corner, making full use of the space in the corner.

In a possible implementation manner of the first aspect, the sum of the length of the first antenna arm and the length of the second antenna arm is approximately one-half of the electromagnetic wave wavelength of the Bluetooth frequency band. The antenna structure formed in this way achieves the greatest degree of openness and can radiate energy more effectively.

In a possible implementation manner of the first aspect, the frequency band of the antenna ranges from 2402 MHz to 2480 MHz.

In a possible implementation of the first aspect, a first radiation layer is laid on the first circuit board, the first radiation layer forms the first antenna arm, and a second radiation layer is laid on the second circuit board. Layer, the second radiating layer forms the second antenna arm.

In a possible implementation manner of the first aspect, the antenna further includes a feeding structure, the feeding structure is arranged in the corner portion, and the first antenna arm and the second antenna arm are respectively fed through the feeding structure. The structure is connected to the transceiver. By arranging the feeding structure in the corner part, the space in the corner part is also fully utilized.

In the second aspect, this application also provides a Bluetooth wireless headset, including:

A housing formed with an ear handle portion, an ear plug portion, and a corner portion connecting the ear handle portion and the ear plug portion, the ear plug portion is provided with a first circuit board, and the ear handle portion is provided with a second circuit board;

An antenna, where the antenna is the antenna in the foregoing first aspect or any implementation manner of the first aspect;

The transceiver, the transceiver is arranged in the housing.

The Bluetooth wireless headset provided by the embodiment of the present application, because the Bluetooth wireless headset includes the antenna described in any of the above technical solutions, on the basis of ensuring that the antenna can effectively transmit and receive signals, because the first antenna arm of the antenna is laid on the first line On the board, the second antenna arm is laid on the second circuit board. In this way, the space of the first circuit board and the second circuit board and the corners are fully utilized. Compared with the prior art, there is no need to separately set up the bracket for laying the first antenna arm and the second antenna arm, which simplifies the structure, and at the same time, The space occupied by the bracket is saved, and the volume of the Bluetooth wireless headset is effectively reduced, so that the Bluetooth wireless headset can meet the miniaturization design requirements of electronic devices.

In a possible implementation of the second aspect, a battery is provided in the ear handle, and a first choke structure is provided on both the connecting wire of the positive electrode of the battery and the connecting wire of the negative electrode of the battery. By providing the first choke structure, the absorption of the radio frequency signal of the antenna by the battery is reduced, so as to ensure the efficiency of the antenna.

In a possible implementation manner of the second aspect, a third circuit board is provided in the corner portion, and the third circuit board is folded into a polyhedral structure that matches the shape of the corner portion. By folding the third circuit board into a polyhedron structure matching the shape of the corners, the structure of the third circuit board is more compact, and the volume of the entire Bluetooth wireless headset is further reduced.

In a possible implementation manner of the second aspect, a first ground wire is formed on the first circuit board, a second ground wire is formed on the second circuit board, and a second ground wire is formed on the third circuit board. A third ground wire arranged in the extension direction and integrally connected with the first ground wire and the second ground wire. The polyhedral structure is formed with a first side surface connected to the first circuit board and a third ground wire connected to the first ground wire. The first side surface is adjacent to the second side surface and connected to the second circuit board, the antenna further includes a feed structure, the feed structure is arranged in the corner, the feed structure includes the The flexible circuit board connected to the second side surface is provided with an extended ground wire connected to the second ground wire, the extended ground wire has a first feeding port, and the transceiver is arranged on the The signal line connected to the radio frequency port of the transceiver on the second circuit board extends to the first side surface, and the end of the signal line extending to the first side surface has a second feeding port, and The first power feeding port is connected to the second power feeding port. Connect the second ground wire to the radio frequency port of the transceiver by extending the ground wire, so that the third ground wire on the folded third circuit board in the corner is used to form a distributed inductance, on two adjacent sides of the folded circuit board The feed port is set so that it is not necessary to disconnect the ground wire of the integral structure from the corner, which ensures the integrity of the ground wire and minimizes the impact on the signal wires and ground wires of other devices, reaching the antenna and the circuit The purpose of board ground conformal.

In a possible implementation manner of the second aspect, the polyhedral structure is a hollow structure with a cavity formed therein, and a support frame for supporting the polyhedral structure is provided in the cavity. The polyhedron structure formed by folding the third circuit board is supported by the support frame to improve the stability of the entire third circuit board.

In a possible implementation manner of the second aspect, the first power feeding port is connected to the second power feeding port through a welding structure; or the first power feeding port is connected to the second power feeding port through a radio frequency connector connection. The two connection structures for connecting the first power feeding port and the second power feeding port are adopted, and the structure is simple, and the implementation is also convenient, and it does not occupy a large space.

In a possible implementation manner of the second aspect, a speaker is provided in the earplug part, and a second choke structure is provided on the differential trace of the speaker. By setting the second choke structure, the transmission of the radio frequency signal to the speaker is suppressed, so as to reduce the absorption of the radio frequency signal by the speaker, thereby ensuring antenna efficiency.

In a possible implementation manner of the second aspect, the first circuit board includes a sub-board that is arranged oppositely and connected by a first connection board and a main board provided with the transceiver, and the sub-board is connected to the third circuit board. Connected, the main board is opposite to the proximity light sensor circuit board provided with the proximity light sensor, and is connected through a second connecting board, the main board is located between the secondary board and the proximity light sensor circuit board, the main board and A placement cavity is formed between the proximity light sensor circuit boards, and the speaker is arranged in the placement cavity. By arranging the first circuit board in this structure, the space in the earplug part can be fully utilized, so that the earplug part has a compact structure and meets the miniaturization design.

In a possible implementation manner of the second aspect, a third choke structure is provided between the ground wire of the proximity light sensor and the ground wire of the main board forming the first antenna arm. The third choke structure is provided to avoid the interference of the signal on the ground wire close to the photosensor to the signal on the second antenna arm.

In a possible implementation manner of the second aspect, the first circuit board, the third circuit board, and the second circuit board are connected in an integrated structure.

In a possible implementation manner of the second aspect, the first circuit board, the second circuit board, and the third circuit board are all rigid-flex boards. In this way, the space in the housing can be fully utilized, so that the volume of the entire Bluetooth wireless headset is small.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of a Bluetooth wireless headset in the prior art;

FIG. 2 is an exploded schematic diagram of a Bluetooth wireless headset according to an embodiment of the application;

3 is a schematic diagram of the structure of a first circuit board, a second circuit board, and a third circuit board according to an embodiment of the application;

FIG. 4 is a schematic structural diagram of a Bluetooth wireless headset according to an embodiment of the application;

FIG. 5 is a schematic structural diagram of an antenna according to an embodiment of the application;

6 is a schematic diagram of the connection relationship between the second ground wire and the signal wire according to the embodiment of the application;

FIG. 7 is a schematic diagram of the connection relationship between the second ground wire and the signal wire according to the embodiment of the application;

Fig. 8 is a free space |S11| diagram of the antenna according to the embodiment of the application;

FIG. 9 is a free space efficiency diagram of an antenna according to an embodiment of the application;

Fig. 10a is an antenna pattern of free space φ=90° of the antenna according to the embodiment of the application;

FIG. 10b is an antenna pattern of the free space φ=0° of the antenna according to the embodiment of the application;

FIG. 10c is an antenna pattern of the free space θ=90° of the antenna according to the embodiment of the application;

FIG. 11 is a |S11| diagram of the headform antenna according to the embodiment of the application;

FIG. 12 is an efficiency diagram of a headform antenna according to an embodiment of the application;

FIG. 13 is a schematic structural diagram of a headform antenna according to an embodiment of the application;

Fig. 14a is an antenna pattern of θ=90° of the head model antenna according to the embodiment of the application;

Fig. 14b is an antenna pattern of φ=90° of the headform antenna according to the embodiment of the application;

Fig. 14c is an antenna pattern of φ=0° of the headform antenna according to the embodiment of the application.

Detailed ways

The embodiment of the present application relates to an antenna and a Bluetooth wireless headset. The antenna and the Bluetooth wireless headset will be described in detail below with reference to the accompanying drawings.

On the one hand, an embodiment of the present application provides an antenna. With reference to FIGS. 2 and 3, the antenna is used to be installed in a Bluetooth wireless headset. The housing 1 of the Bluetooth wireless headset includes an earplug part 101, an ear handle 102, and a connecting ear handle. Part 102 and the corner part 103 of the earplug part 101, the earplug part 101 is provided with a first circuit board 21, and the ear handle part 102 is provided with a second circuit board 22. Referring to FIG. 5, the antenna includes: a first antenna arm 91 and a first antenna arm 91 and a second circuit board 22. Two antenna arms 92, where the first antenna arm 91 is laid on the first circuit board 21, the second antenna arm 92 is laid on the second circuit board 22, and the first antenna arm 91 and the second antenna arm 92 are respectively fed The structure is connected with the transceiver.

It should be noted that “laying” referred to in the embodiments of the present application refers to laying along the extending direction of the circuit board.

Since the first antenna arm 91 is laid on the first circuit board 21, that is, it is laid along the extension direction of the first circuit board 21, while the second antenna arm 92 is laid on the second circuit board 22, that is, along the second circuit board 22. Layout in the extension direction, compared with the prior art, there is no need to set up a bracket for carrying the first antenna arm 91 and the second antenna arm 92, which reduces the number of parts. When the antenna is applied to a Bluetooth wireless headset, the Bluetooth will be significantly simplified. The structure of the wireless headset avoids the need for a bracket to take up space to increase the volume of the entire Bluetooth wireless headset. Especially for smaller Bluetooth wireless headsets, the structure of the Bluetooth wireless headset is more compact on the premise that the antenna can effectively send and receive signals. It is consistent with the miniaturization design idea.

Generally, the first circuit board 21 is arranged along the extending direction of the earplug portion 101, the second circuit board 22 is arranged along the extending direction of the ear stem 102, and the first antenna arm 91 is arranged along the extending direction of the first circuit board 21, and the second circuit board 22 is arranged along the extending direction of the ear stem 102, and the first antenna arm 91 is arranged along the extending direction of the first circuit board 21. The combination of the arrangement of the two antenna arms 92 along the extension direction of the second circuit board 22 will make the structure of the entire Bluetooth wireless headset more compact and reduce the volume of the Bluetooth wireless headset.

There are multiple implementations of the first antenna arm 91 and the second antenna arm 92. When the antenna provided in the embodiment of the present application is applied to a Bluetooth wireless headset, in this field, a chip is provided on the first circuit board of the Bluetooth wireless headset. , The power supply lines and signal lines of various sensors and speakers (for ease of description, the power supply line on the first circuit board is called the first power supply line, and the signal line on the first circuit board is called the first signal line) and The first power supply line and the first signal line provide the first grounding line of the reference ground, and the power supply line and signal line of the battery and the microphone are provided on the second circuit board of the Bluetooth wireless headset (for ease of description, the second circuit board The power supply line is called the second power supply line, the signal line on the second circuit board is called the second signal line) and the second ground line that provides a reference ground for the second power supply line and the second signal line. In some embodiments, the first ground wire is the first antenna arm 91, and the second ground wire is the second antenna arm 92. That is to say, the first antenna arm provided in the embodiment of the present application directly uses the existing first ground. Wire, the second antenna arm directly uses the existing second ground wire. In other embodiments, the first radiation layer is provided on the first circuit board, the first radiation layer forms the first antenna arm, the second radiation layer is provided on the second circuit board, and the second radiation layer forms the second antenna arm. Compared with the second embodiment, the technical effect achieved by the first embodiment is as follows: the first ground wire is directly used as the first antenna arm, and the second ground wire is used as the second antenna arm, which simplifies the structure and avoids setting the second antenna arm. The phenomenon that a radiation layer and a second radiation layer increase the size of the first circuit board and the second circuit board, thereby further reducing the size of the first circuit board and the second circuit board, and correspondingly reducing the volume of the entire Bluetooth wireless headset .

In order to ensure that the radio frequency signal of the antenna arm will not be transmitted to the reference ground, the first ground wire and the second ground wire are respectively isolated from the reference ground of the components in the Bluetooth wireless headset by an isolation structure. The isolation structure is used to prevent the first ground wire The radio frequency signal and the radio frequency signal on the second ground wire are transmitted to the reference ground, that is, the first ground wire is isolated from the reference ground of the components in the earplug through the first isolation structure, and the first isolation structure is used to prevent the first ground wire The radio frequency signal is transmitted to the reference ground of the components in the earplug, the second ground wire is isolated from the reference ground of the components in the ear stem by the second isolation structure, and the second isolation structure is used to block the radio frequency signal on the second ground wire Transmitted to the reference ground of the components in the ear handle. For example, the first isolation structure may adopt a first inductance connected in series to the first ground line, and the second isolation structure may adopt a second inductor connected in series to the second ground line, or the first isolation structure may adopt a series connected to the first The first capacitor on the ground line, the second isolation structure is a second capacitor connected in series to the second ground line, or the first isolation structure can use a first resistor connected in series to the first ground line, and the second isolation structure is a series connection The second resistance on the second ground wire, the first inductance, the first capacitor, the first resistance, the second inductance, the second capacitor, and the second resistance are adjustable; as another example, the isolation structure can also be connected in series. Non-adjustable fixed inductance, non-adjustable fixed capacitance or non-adjustable fixed resistance connected in series with the first grounding wire and the second grounding wire. Of course, the isolation structure can also be implemented in other embodiments. It should be noted that the components in the ear handle of the Bluetooth wireless headset refer to batteries, microphones, etc., and the components in the earbuds refer to various sensors, speakers, and chips. The reference ground of the component refers to the ground terminal of the component.

In the art, the first ground wire on the first circuit board and the second ground wire on the second circuit board are usually connected as an integral structure, the battery is arranged on the ear handle, and the transceiver is arranged on the second circuit board of the earplug. In order to ensure the integrity of the first ground wire and the second ground wire, an extended ground wire is provided in the corner. One end of the extended ground wire is connected to the second ground wire, and the other end is connected to the radio frequency port of the transceiver. The first ground wire Connect to the ground port of the transceiver. In this way, there is no need to disconnect the first ground wire and the second ground wire that are connected together, which ensures the integrity of the ground wire, minimizes the impact on the signal wires and ground wires of other devices, and extends the ground wire setting In the corner portion, the space in the corner portion is fully utilized, thereby further reducing the volume of the Bluetooth wireless headset.

For example, the sum of the length of the first antenna arm 91 and the length of the second antenna arm 92 is approximately one-half of the electromagnetic wave wavelength of the Bluetooth frequency band. It should be noted that approximately means that the length of the first antenna arm 91 The sum of the length and the length of the second antenna arm 92 is approximately equal to one half of the electromagnetic wave wavelength in the Bluetooth frequency band, that is, the sum of the length of the first antenna arm 91 and the length of the second antenna arm 92 and two of the electromagnetic wave wavelength in the Bluetooth frequency band The difference of one part is within the preset range. During specific implementation, the electrical length can be adjusted to one-half through the adjustment of the matching circuit, but the total length of the antenna arm may not be exactly one-half.

As another example, the length of the first antenna arm 91 and the length of the second antenna arm 92 are both a quarter of the wavelength of the electromagnetic wave. That is, the lengths of the first antenna arm 91 and the second antenna arm 92 may be equal or unequal.

The frequency band range of the antenna provided in the embodiment of the present application is 2402 MHz to 2480 MHz.

The antenna also includes a feeding structure. In order to further utilize the space in the earphone shell, the feeding structure is arranged in the corner portion, and the first antenna arm and the second antenna arm are respectively connected to the transceiver through the feeding structure.

On the other hand, an embodiment of the present application also provides a Bluetooth wireless headset. Referring to Figures 2 and 3, the Bluetooth wireless headset includes a housing 1, an antenna, and a transceiver. The housing 1 is formed with an earplug part 101, an ear handle 102, and Connect the ear handle portion 102 and the corner portion 103 of the ear plug portion 101, the ear plug portion 101 is provided with a first circuit board 21, and the ear handle portion 102 is provided with a second circuit board 22; the antenna is the antenna provided in the above-mentioned embodiment; Set in the housing 1.

Since the Bluetooth wireless headset includes the antenna provided in the above embodiment, the antenna includes a first antenna arm laid on the first circuit board and a second antenna arm laid on the second circuit board, that is, the first circuit board serves as The carrier of the first antenna arm and the second circuit board are used as the carrier of the second antenna arm, so there is no need to provide corresponding carriers for the first antenna arm and the second antenna arm, which simplifies the structure and especially reduces the cost of the carrier. The occupied space further reduces the volume of the Bluetooth wireless headset, which is consistent with the miniaturized design of electronic products. At the same time, it also reduces the difficulty of the assembly process and reduces the manufacturing cost; and because the first antenna arm extends along the direction of the first circuit board The second antenna arm is arranged along the extension direction of the second circuit board, that is, the direction of the first antenna arm is consistent with the direction of the first circuit board, and the direction of the second antenna arm is consistent with the direction of the second circuit board, making full use of the first antenna arm. The first circuit board and the second circuit board effectively reduce the volume of the entire Bluetooth wireless headset.

In some embodiments, referring to FIGS. 2 and 3, a third circuit board 23 is provided in the corner 103. In order to further reduce the volume of the Bluetooth wireless headset, the third circuit board 23 is folded to match the shape of the corner 103 Polyhedron structure.

The polyhedral structure is a hollow structure with a cavity formed inside, and a support frame for supporting the polyhedral structure is provided in the cavity, and the polyhedral structure is supported by the support frame to ensure stability.

In some embodiments, referring to FIG. 5, the third circuit board 23 is formed with a third ground wire arranged along its extending direction and connected to the first ground wire and the second ground wire integrally, and the polyhedral structure is formed with A first side surface connected to the first circuit board and a second side surface adjacent to the first side surface and connected to the second circuit board. Referring to FIGS. 6 and 7, the feed structure includes a flexible circuit board 11 connected to the second side surface. , The flexible circuit board 11 is provided with an extended ground wire 10 connected to the second antenna arm 92, the extended ground wire 10 has a first feeding port, the transceiver is arranged on the second circuit board, and is connected to the radio frequency port of the transceiver The signal line 12 extends to the first side surface, the end of the signal line 12 extending to the first side surface has a second power feeding port, and the first power feeding port is connected to the second power feeding port. The integrity of the ground wire, the second ground wire and the third ground wire, and because the third circuit board is in a folded structure, the third ground wire is also in a folded structure, so that the third circuit board in the folded structure can be used as a distributed inductor ,Ensure antenna efficiency.

3 and 5, the folded polyhedron of the third circuit board 23 includes a first side 231, a second side 232, a third side 233, a fourth side 234, and a fifth side 235, the first side 231 and the first circuit board 21 is connected, the fifth side surface 235 is connected to the second circuit board 22, the signal line extends to the first side surface 231 and the signal line has a second feed port 24, and the fifth side surface 235 is provided with a first ground line connected to the second ground line. Feed port 25. The third circuit board 23 forms a bent structure. On the basis of ensuring that the relevant components can be carried, the occupied space is sufficiently reduced, and the second feeding port is arranged on the first side surface close to the first antenna arm. The feeding port is arranged on the fifth side close to the second antenna arm, so as to avoid designing a longer connecting line to connect the first feeding port and the first antenna arm, and setting a longer connecting line to connect the second feeding port and The second antenna arm.

In some embodiments, referring to FIGS. 6 and 7, the first feed port of the extended ground wire 10 is connected to the second feed port of the signal line 12 through a welding structure. For example, the first feeder port is provided at the first feeder port. On the pad 1301, the second feeder port is provided on the second pad 1302, and the first pad 1301 is connected to the second pad 1302 through a soldering layer; in other embodiments, the first feeder port is provided with The first radio frequency connection port and the second feeder line port are provided with a second radio frequency connection port, and the first radio frequency connection port is buckled with the second radio frequency connection port so that the signal wire is connected to the extended ground wire.

2 and 4, the ear handle 102 is provided with a battery 3, in order to prevent the battery 3 from absorbing radio frequency signals, the positive connection line of the battery 3 and the negative connection line of the battery 3 are both provided with a first choke Structure 6. By providing the first choke structure 6, the absorption of radio frequency signals by the battery can be effectively reduced, so as to ensure the antenna efficiency. For example, the connection line of the positive electrode of the battery 3 and the connection line of the negative electrode of the battery 3 may be connected in series with an inductor, a capacitor, or a resistor for choking.

2 and 4, a speaker 4 is provided in the earplug part 101. In order to prevent the speaker 4 from absorbing radio frequency signals, a second choke structure 7 is provided on the differential trace of the speaker 4. The second choke structure 7 can effectively reduce the transmission of the signal from the second antenna arm to the speaker 4, so as to reduce the absorption of radio frequency signals by the speaker 7 to protect the antenna efficiency. For example, the differential traces of the speaker 4 may be connected in series with inductors, capacitors, or resistors for choking.

In some embodiments, referring to FIGS. 3 and 4, the first circuit board includes a sub-board 211 that is arranged oppositely and connected by a first connection board 214 and a main board 212 provided with a transceiver. The sub-board 211 and the third circuit board 23 The main board 212 is opposite to the proximity light sensor circuit board 213 provided with the proximity light sensor, and is connected through the second connecting board 215. The main board 212 is located between the sub-board 211 and the proximity light sensor circuit board 213, and the main board 212 and the proximity light sensor A placing cavity is formed between the circuit boards 213, and a speaker 4 is arranged in the placing cavity. The secondary board 211, the first connecting board 214, the main board 212, the second connecting board 215, and the proximity light sensor circuit board 213 form a structure that matches the shape of the earplug, thereby making full use of the space in the earplug.

In order to avoid the absorption of the signal on the second antenna arm by the signal on the ground wire close to the optical sensor, a third choke is provided between the ground wire close to the optical sensor and the ground wire of the main board formed as the first antenna arm. Structure 8. The third choke structure is used to avoid the interference of the signal on the second antenna arm by the signal on the ground wire close to the light sensor. If the ground wire close to the light sensor is directly connected to the ground wire of the main board as the second antenna arm At this time, the radio frequency signal can be conducted to the ground wire close to the light sensor, and the ground wire close to the light sensor is deeper into the ear canal, and the human body has a great influence on the antenna efficiency. When the third choke structure 8 is used for choke, the radio frequency signal cannot be conducted to the ground wire close to the light sensor. This can also reduce the human body's absorption of radio frequency signals. For example, an inductance, capacitance, or resistance can be connected in series with the ground line close to the light sensor.

The first choke structure, the second choke structure, and the third choke structure provided by the embodiments of the present application are not limited in their installation positions during specific installation. For example, the first choke structure can be set on the top or bottom of the ear handle. .

3, the first circuit board 21, the third circuit board 23, and the second circuit board 22 are connected as a whole, and a structure that matches the shape of the Bluetooth wireless headset is formed by bending, and the first circuit board 21 and the second circuit board 22 and the third circuit board 23 are both rigid and flexible boards. The use of a soft-hard combination board can make full use of the space in the shell without increasing the shell of the earphone, so that the Bluetooth wireless earphone can meet the miniaturization design.

3, the earplug part of the Bluetooth wireless headset provided by the embodiment of the present application further includes an earplug shell 5, of course, it may also include other structures, which are not listed here.

From the free space simulation shown in Figure 8 and Figure 9, it can be seen that when the Bluetooth frequency band in the Bluetooth wireless headset is 2402MHz to 2480MHz, the free space antenna efficiency is about -0.3dB, and the return loss of the antenna is relatively low. It is small, the antenna bandwidth is large, the antenna structure formed by the circuit board has a high degree of openness, and the antenna efficiency and antenna bandwidth are good. From the head model simulation shown in Figure 11 and Figure 12, it can be seen that the head model antenna efficiency is about -5dB, the head model antenna efficiency is reduced by about 4.7dB relative to the free space efficiency, and the return loss of the head model antenna is also small. The antenna bandwidth is large, the antenna structure formed by the circuit board is highly open, the antenna efficiency and the antenna bandwidth are good, and the antenna efficiency under the head mold can meet the requirements of good communication performance.

It can be seen from Figures 10a to 10c that the gain of the antenna in all directions is relatively uniform, all greater than 0dBi, and the communication is more stable.

It can be seen from Figure 13 and Figure 14a to Figure 14c that the antenna radiation pattern does not have a gain zero point on the outside of the head model. The gain in all directions is relatively uniform and the coverage is relatively uniform. Compared with the prior art, it will significantly improve the performance of the Bluetooth wireless headset. Work performance, improve user communication experience.

In the description of this specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. It should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

An antenna, characterized in that the antenna is arranged in a Bluetooth wireless headset, and the housing of the Bluetooth wireless headset includes an ear handle, an ear plug, and a corner portion connecting the ear handle and the ear plug. A first circuit board is arranged in the earplug part, a second circuit board is arranged in the ear handle part, and the antenna includes:

A first antenna arm, where the first antenna arm is laid on the first circuit board;

A second antenna arm, where the second antenna arm is laid on the second circuit board;

A feeding structure, the first antenna arm and the second antenna arm are respectively connected to a transceiver through the feeding structure.
The antenna according to claim 1, wherein a first ground line, a first power supply line, and a first signal line are formed on the first circuit board, and the first ground line is used for the first The power supply line and the first signal line provide a reference ground, the first ground line is the first antenna arm; the second circuit board is formed with a second ground line, the second power supply line and the second signal line The second ground line is used to provide a reference ground for the second power supply line and the second signal line, and the second ground line is the second antenna arm.
The antenna according to claim 2, wherein the first ground wire is isolated from the reference ground of the components in the earplug portion by a first isolation structure, and the first isolation structure is used to prevent the first The radio frequency signal on the ground wire is transmitted to the reference ground of the components in the earplug, and the second ground wire is isolated from the reference ground of the components in the ear stem by a second isolation structure. The second isolation structure It is used to prevent the radio frequency signal on the second ground wire from being transmitted to the reference ground of the components in the ear handle.
The antenna according to claim 3, wherein the first isolation structure includes a first inductor connected in series on the first ground line, and the second isolation structure includes a first inductor connected in series on the second ground line. The second inductance.
The antenna according to any one of claims 1 to 4, wherein the first ground wire and the second ground wire are connected into an integrated structure, and the transceiver is provided on the second circuit board An extension ground wire is provided in the corner portion, one end of the extension ground wire is connected to the second ground wire, and the other end is connected to the radio frequency port of the transceiver, and the first ground wire is connected to the transceiver The ground terminal is connected.
The antenna according to any one of claims 1-5, wherein the sum of the length of the first antenna arm and the length of the second antenna arm is approximately one-half of the electromagnetic wave wavelength of the Bluetooth frequency band .
The antenna according to any one of claims 1-6, wherein the feeding structure is arranged in the corner portion, and the first antenna arm and the second antenna arm are respectively fed through The structure is connected to the transceiver.
The antenna according to any one of claims 1-7, wherein the frequency band of the antenna ranges from 2402MHz to 2480MHz.
A Bluetooth wireless headset, which is characterized in that it comprises:

A housing formed with an ear handle portion, an ear plug portion, and a corner portion connecting the ear handle portion and the ear plug portion, the ear plug portion is provided with a first circuit board, and the ear handle portion is provided with a second circuit board;

An antenna, which is the antenna according to any one of claims 1 to 8;

The transceiver, the transceiver is arranged in the housing.
The Bluetooth wireless headset according to claim 9, wherein a battery is provided in the ear handle, and a first choke structure is provided on the connecting wire of the positive electrode of the battery and the connecting wire of the negative electrode of the battery. .
The Bluetooth wireless headset according to claim 9 or 10, wherein a third circuit board is provided in the corner portion, and the third circuit board is folded into a polyhedral structure matching the shape of the corner portion.
The Bluetooth wireless headset according to claim 11, wherein a first ground wire is formed on the first circuit board, a second ground wire is formed on the second circuit board, and a second ground wire is formed on the second circuit board. A third ground wire is formed along its extension direction and connected to the first ground wire and the second ground wire. The polyhedron structure is formed with a first ground wire connected to the first circuit board. A side surface and a second side surface adjacent to the first side surface and connected to the second circuit board, the antenna further includes a feeding structure, the feeding structure being arranged in the corner portion, the feeding structure The structure includes a flexible circuit board connected to the second side surface, and an extended ground wire connected to the second ground wire is arranged on the flexible circuit board. The extended ground wire has a first feeding port, and the transceiver The signal line connected to the radio frequency port of the transceiver extends to the first side surface, and the end of the signal line extending to the first side surface has a second feeder. An electrical port, the first feeding port is connected to the second feeding port.
The Bluetooth wireless headset according to claim 12, wherein the polyhedral structure is a hollow structure with a cavity formed inside, and a support frame for supporting the polyhedral structure is provided in the cavity.
The Bluetooth wireless headset according to claim 12 or 13, wherein the first power feeding port is connected to the second power feeding port through a welding structure; or the first power feeding port is connected to the second power feeding port through a radio frequency connector. The second feeding port is connected.
The Bluetooth wireless headset according to any one of claims 9-14, wherein a speaker is provided in the ear handle, and a second choke structure is provided on the differential trace of the speaker.
The Bluetooth wireless headset according to claim 15, wherein the first circuit board comprises a sub-board which is arranged oppositely and connected through the first connecting board and a main board provided with the transceiver, and the sub-board is connected to the main board. The third circuit board is connected, the main board is opposite to the proximity light sensor circuit board provided with the proximity light sensor, and is connected through the second connecting board, the main board is located between the secondary board and the proximity light sensor circuit board A placing cavity is formed between the main board and the proximity light sensor circuit board, and the speaker is arranged in the placing cavity.
The Bluetooth wireless headset according to claim 16, wherein a third choke structure is provided between the ground wire of the proximity light sensor and the ground wire of the main board formed as the first antenna arm.