CN104183914B - Wireless earphone and antenna for wireless earphone - Google Patents

Abstract

The antenna for the wireless earphone comprises a first coaxial cable, a radio frequency coupling capacitor, a first radio frequency choke coil and a second radio frequency choke coil. The first end of the first coaxial cable is coupled with the sound generation unit, the second end of the first coaxial cable is coupled with the audio amplifier, and the first coaxial cable transmits the audio signal to the sound generation unit. The first conductive shield of the first coaxial cable is coupled to the radio frequency circuit unit through a radio frequency coupling capacitor, and the first conductive shield is used as a radiation part for wirelessly receiving and transmitting radio frequency signals. The radio frequency coupling capacitor enables the radio frequency signal to pass through and blocks the audio signal from entering the radio frequency circuit unit. The audio amplifier is coupled with the first coaxial cable through the first radio frequency choke coil and the second radio frequency choke coil. The first radio frequency choke coil and the second radio frequency choke coil enable the audio signals to pass through and block the radio frequency signals from entering the audio amplifier.

Description

Wireless earphone and antenna for wireless earphone

technical field

The invention relates to an antenna, and in particular to an antenna for a wireless earphone and the wireless earphone.

Background technique

With the advancement of technology and consumers' demand for products from miniaturization to miniaturization, wireless earphones have changed from the traditional over-the-ear type to the miniaturized ear-hook type. With the advancement of material technology, technology can always provide materials that meet similar electrical properties and are miniaturized. Such as flip-chip packaged semiconductors, miniaturized passive components, and even high-energy-density lithium batteries.

Among them, although the key component that can be miniaturized but cannot maintain the proper electrical performance is the antenna. Miniaturized antennas such as ceramic antennas can maintain certain characteristics such as frequency resonance and low reflection coefficient under reduced size conditions, but another more important characteristic, that is, antenna radiation efficiency, is due to its Miniaturized and greatly reduced. In the case of maintaining the same communication distance, the transmission power must be increased to compensate for the decrease in antenna radiation efficiency. However, increasing the transmission power results in an increase in power consumption and shortens the use time of the device. In terms of application, the miniature antenna must still maintain a certain surrounding space, otherwise its frequency resonance characteristics and reflection coefficient will be affected by the surrounding components and deteriorate. This limitation also makes it difficult to miniaturize the product.

Contents of the invention

Embodiments of the present invention provide an antenna for a wireless earphone and a wireless earphone, which can transmit audio signals through a coaxial cable, and meanwhile, use the conductive shield of the coaxial cable as an antenna radiation element for sending and receiving radio frequency signals.

An embodiment of the present invention provides an antenna for a wireless earphone, including a first coaxial cable, a radio frequency coupling capacitor, a first radio frequency choke coil, and a second radio frequency choke coil. The first coaxial cable has a first end and a second end, the first end is used for coupling the sounding unit, the second end is used for coupling the audio amplifier, and the first coaxial cable transmits the audio signal from the audio amplifier to the sounding unit. unit. The first coaxial cable includes a first inner conductor, a first insulating layer surrounding the first inner conductor, and a first conductive shield surrounding the first insulating layer. The contact of the first conductive shield adjacent to the second end is used for coupling the radio frequency circuit unit, wherein the first conductive shield serves as a radiation part for wirelessly transmitting and receiving radio frequency signals. The contact of the first conductive shield adjacent to the second end is coupled to the radio frequency circuit unit through the radio frequency coupling capacitor, wherein the radio frequency coupling capacitor allows the radio frequency signal to pass and blocks the audio signal from the audio amplifier from entering the radio frequency circuit unit. The audio amplifier is coupled to the contact point adjacent to the second end of the first inner conductor through the first radio frequency choke. The audio amplifier is coupled to a contact of the first conductive shield adjacent to the second end through the second radio frequency choke. The first radio frequency choke coil and the second radio frequency choke coil pass the audio signal of the audio amplifier and block the radio frequency signal from entering the audio amplifier.

An embodiment of the present invention provides a wireless earphone, including a control device, a pronunciation unit, a first coaxial cable, a radio frequency coupling capacitor, a first radio frequency choke coil, and a second radio frequency choke coil. The control device includes a radio frequency circuit unit and an audio processing unit, and the audio processing unit has an audio amplifier. The first coaxial cable has a first end and a second end, the first end is coupled to the sound unit, and the second end is coupled to the audio amplifier. The first coaxial cable transmits the audio signal from the audio amplifier to the pronunciation unit. The first coaxial cable includes a first inner conductor, a first insulating layer surrounding the first inner conductor, and a first conductive shield surrounding the first insulating layer. A contact point adjacent to the second end of the first conductive shield is coupled to the radio frequency circuit unit. The first conductive shield serves as a radiation part for wirelessly transmitting and receiving radio frequency signals. A contact point adjacent to the second end of the first conductive shield is coupled to the radio frequency circuit unit through the radio frequency coupling capacitor. The radio frequency coupling capacitor allows the radio frequency signal to pass through, and blocks the audio signal from the audio amplifier from entering the radio frequency circuit unit. The audio amplifier is coupled to the contact point adjacent to the second end of the first inner conductor through the first radio frequency choke. The audio amplifier is coupled to a contact of the first conductive shield adjacent to the second end through the second radio frequency choke. The first radio frequency choke coil and the second radio frequency choke coil pass the audio signal of the audio amplifier and block the radio frequency signal from entering the audio amplifier.

To sum up, the embodiment of the present invention provides an antenna for a wireless earphone and its wireless earphone. The antenna for a wireless earphone and its wireless earphone can transmit audio signals through a coaxial cable, and at the same time use the coaxial cable to transmit audio signals. The conductive shield acts as an antenna radiating element for sending and receiving radio frequency signals.

In order to enable a further understanding of the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention, but these descriptions and accompanying drawings are only used to illustrate the present invention, rather than claiming the present invention any limitations on the scope.

Description of drawings

Fig. 1 is a schematic diagram of the appearance of a wireless earphone provided by an embodiment of the present invention.

Fig. 2 is a circuit block diagram of a wireless earphone provided by an embodiment of the present invention.

Fig. 3 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by an embodiment of the present invention.

Fig. 4 is a schematic diagram of a first coaxial cable of a wireless earphone provided by an embodiment of the present invention.

Fig. 5 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by another embodiment of the present invention.

Fig. 6 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by another embodiment of the present invention.

Fig. 7 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by another embodiment of the present invention.

Fig. 8 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by another embodiment of the present invention.

Fig. 9 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by another embodiment of the present invention.

Fig. 10 is a schematic diagram of the connection relationship of the first coaxial cable, the second coaxial cable and the third coaxial cable of the wireless earphone provided by another embodiment of the present invention.

【Symbol Description】

1: Wireless earphones

11: Pronunciation unit

12: Control device

13, 13': the first coaxial cable

13a: first end

13b, P1: second terminal

131, 131': the first inner conductor

132, 132': the first insulating layer

133, 133': first conductive shield

121. RF: radio frequency circuit unit

121a: Radio frequency integrated circuits

121b: RF matching circuit

122: Audio processing unit

122a, Amp1: audio amplifier

123, C2: RF coupling capacitor

124: The first radio frequency choke coil

125: Second radio frequency choke coil

14: Second coaxial cable

141: second inner conductor

142: Second insulating layer

143: Second conductive shield

15: The third coaxial cable

151: The third inner conductor

152: third insulating layer

153: Third conductive shield

P2, P3: endpoints

SP1: Headphones

CA1, CA2, CA2’, CA3: coaxial cables

L1, L2, L3: Length

A: node

M1: matching circuit

detailed description

[Antenna of Wireless Earphone and Embodiment of Wireless Earphone]

In the prior art, the wavelength is between 0.5 meters (corresponding to 600 MHz) and 3 meters (corresponding to 100 MHz) due to the low operating frequency (between tens and hundreds of MHz). Therefore, the headphone cable with a length of tens of centimeters is equivalent to between 1/2 wavelength and 1/10 wavelength, which is easy to match with the antenna.

With the advancement of technology, the mainstream operating frequency has been increased to 2.4GHz, and its wavelength is only 12.5 cm, so that the headphone cable with a length of tens of centimeters is equivalent to 2 to 3 times the wavelength of 2.4 GHz, because its wavelength is too long to make it difficult to match as The 2.4GHz frequency band antenna is used.

In order to solve the problem that the length of the headphone cable is greater than the wavelength of the working frequency and is difficult to match due to the increase of the working frequency, the present invention provides a new method of using the headphone cable as an antenna. Frequency band, its equivalent wavelength is too long and difficult to match.

In order to solve the problems in the prior art, an embodiment of the present invention provides an antenna for a wireless earphone and the wireless earphone.

Please refer to FIG. 1 and FIG. 2 at the same time. FIG. 1 is a schematic diagram of the appearance of the wireless earphone provided by the embodiment of the present invention, and FIG. 2 is a circuit block diagram of the wireless earphone provided by the embodiment of the present invention. The wireless earphone 1 includes a control device 12 , a sounding unit 11 , a first coaxial cable 13 , a radio frequency coupling capacitor 123 , a first radio frequency choke coil 124 and a second radio frequency choke coil 125 . The control device 12 includes a radio frequency circuit unit 121 and an audio processing unit 122, and the audio processing unit 122 has an audio amplifier 122a. The radio frequency circuit unit 121 includes a radio frequency integrated circuit 121a and a radio frequency matching circuit 121b, but the present invention does not limit the implementation of the radio frequency circuit unit 121 . As shown in FIG. 1 , the body of the control device 12 can accommodate a radio frequency coupling capacitor 123 , a first radio frequency choke coil 124 , a second radio frequency choke coil 125 , a radio frequency circuit unit 121 and an audio processing unit 122 . The wireless earphone 1 may be an ear-hook type wireless earphone or an earplug type wireless earphone, and the present invention does not limit the appearance structure and shape of the pronunciation unit 11 .

Referring again to FIG. 2 , the first coaxial cable 13 has a first end 13 a and a second end 13 b , the first end 13 a is coupled to the sound unit 11 , and the second end 13 b is coupled to the audio amplifier 122 a of the audio processing unit 122 . The first coaxial cable 13 transmits the audio signal from the audio amplifier 122 a to the sound generating unit 11 . The first coaxial cable 13 includes a first inner conductor 131 , a first insulating layer 132 surrounding the first inner conductor 131 , and a first conductive shield 133 surrounding the first insulating layer 132 . In addition, usually the first conductive shield 133 of the first coaxial cable 13 is coated with an insulating layer, which is not shown in FIG. 2 .

Referring again to FIG. 2 , the contact point of the first conductive shield 133 adjacent to the second end 13 b is coupled to the radio frequency circuit unit 121 , wherein the first conductive shield 133 serves as a radiation part for wirelessly transmitting and receiving radio frequency signals. In more detail, the contact point of the first conductive shield 133 adjacent to the second end 13b is coupled to the radio frequency circuit unit 121 through the radio frequency coupling capacitor 123, wherein the radio frequency coupling capacitor 123 allows the radio frequency signal to pass and blocks the audio signal from the audio amplifier 122a Enter the RF circuit unit. The audio amplifier 122a is coupled to a contact of the first inner conductor 131 adjacent to the second end 13b through the first RF choke 124 . The audio amplifier 122 a is coupled to a contact of the first conductive shield 133 adjacent to the second end 13 b through the second RF choke 125 . The first RF choke 124 and the second RF choke 125 allow the audio signal of the audio amplifier 122a to pass through, and block the RF signal from entering the audio amplifier 122a.

In other words, the wireless earphone 1 includes an antenna for the wireless earphone, and the antenna includes the first coaxial cable 13 , the RF coupling capacitor 123 , the first RF choke coil 124 and the second RF choke coil 125 . The first coaxial cable 13 has a first end 13a and a second end 13b, the first end 13a is used for coupling the pronunciation unit 11, the second end 13b is used for coupling the audio amplifier 122a, and the first coaxial cable 13 transmits The audio signal from the audio amplifier 122a is sent to the pronunciation unit 11 . The first coaxial cable 13 includes a first inner conductor 131 , a first insulating layer 132 surrounding the first inner conductor 131 , and a first conductive shield 133 surrounding the first insulating layer 132 . A contact point of the first conductive shield 133 adjacent to the second end 13b is used for coupling to the radio frequency circuit unit 121, wherein the first conductive shield 133 serves as a radiation part for wirelessly transmitting and receiving radio frequency signals. The contact point adjacent to the second end 13b of the first conductive shield 133 is coupled to the radio frequency circuit unit 121 through the radio frequency coupling capacitor 123, wherein the radio frequency coupling capacitor 123 allows the radio frequency signal to pass, and blocks the audio signal from the audio amplifier 122a from entering the radio frequency circuit unit 121 . The audio amplifier 122a is coupled to a contact of the first inner conductor 131 adjacent to the second end 13b through the first RF choke 124 . The audio amplifier 122 a is also coupled to a contact of the first conductive shield 133 adjacent to the second terminal 13 b through the second RF choke 125 . The first RF choke 124 and the second RF choke 125 allow the audio signal of the audio amplifier 122a to pass through, and block the RF signal from entering the audio amplifier 122a.

It can be seen from the above that the radiation part of the antenna of the wireless earphone 1 is realized by the first conductive shield 133 of the first coaxial cable 13 . For the radio frequency signal of the radio frequency circuit unit 121, the first inner conductor 13 of the first coaxial cable 13 can be regarded as grounding, and the grounding of the first inner conductor 13 can be realized by the common grounding of the audio amplifier 122a and the radio frequency circuit unit 121. Implementation, for example: the ground of the radio frequency circuit unit 121 and the audio amplifier 122a can be connected to the common ground plane of the circuit board. The radio frequency signal is fed into the first conductive shield 133 through the radio frequency coupling capacitor 123. As far as the commonly used 2.4GHz wireless frequency band (including Bluetooth and wireless network frequency bands) is concerned, the length of the first conductive shield 133 from the second end 13b can be Between 6 cm and 8 cm, at this time the first conductive shield 133 acts as the radiation part of the antenna, which operates at the resonant frequency of 1/4 wavelength. In other words, the length of the first coaxial cable 13 (ie, the length of the first conductive shield 133 ) may be between 0.5 and 0.65 times the wavelength corresponding to the operating frequency of the antenna. It is worth mentioning that the first coaxial cable 13 is used to simultaneously transmit audio signals and radio frequency signals. The audio signal is transmitted to the sound unit 11 through the first inner conductor 131 and the first conductive shield 133 of the first coaxial cable 13 . In particular, radio frequency signals are transmitted and received wirelessly through the first conductive shield 133 .

It is worth mentioning that the first conductive shield 133 can be formed by braiding a plurality of wires in a mesh shape, or realized by a tubular conductor (such as a copper tube). The present invention does not limit the implementation of the first conductive shield 133 . Generally speaking, those skilled in the art can easily understand that common coaxial cables are flexible. Using the flexible first coaxial cable 13 can make it easier for the user of the wireless earphone to wear the sounding unit 11 .

Please refer to FIG. 3 . FIG. 3 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by an embodiment of the present invention. The earphone SP1 in FIG. 3 is the pronunciation unit 11 in FIG. 2 . The following uses an antenna for 2.4 GHz as an example for illustration, but the present invention is not limited thereto. When the coaxial cable C1 is connected to the earphone SP1 (earphone speaker), the impedance Z of the pronunciation unit SP1 at 2.4GHz is R+X, where R is the real part of the impedance and X is the imaginary part of the impedance. The cable C1 is adjusted to a length L1 so that its impedance Z1 is R1 and X is equal to 0, thereby achieving proper impedance matching. Based on the above principles, please refer to the following FIG. 4 for further illustration.

Please refer to FIG. 2 and FIG. 4 at the same time. FIG. 4 is a schematic diagram of a first coaxial cable of a wireless earphone provided by an embodiment of the present invention. For the radio frequency circuit unit, under the condition that 50 ohms (Ω) is used as the impedance matching condition, the impedance of the pronunciation unit 11 is not necessarily 50 ohms (for example: 16 ohms or 32 ohms). At this time, in order to make the impedance seen by the second end 13b close to 50 ohms, the length of the first coaxial cable 13 (the length of the first conductive shield 133) can be fine-tuned to make the impedance seen by the second end 13b Close to 50 ohms. Alternatively, the impedance value of the RF matching circuit 121b can also be adjusted so that the impedance seen from the RF integrated circuit 121a to the RF matching circuit 121b is close to 50 ohms. The radio frequency matching circuit 121b may include passive components such as inductors, resistors, or capacitors.

[antenna of wireless earphone and another embodiment of wireless earphone thereof]

In the previous embodiment, only one coaxial cable is used to connect the pronunciation unit and the radio frequency matching circuit. On the contrary, in this embodiment, a connection method using more than two coaxial cables is provided.

Please refer to FIG. 3 and FIG. 5 at the same time. FIG. 5 is a schematic diagram of adjusting the impedance matching of the earphone antenna provided by another embodiment of the present invention. Using the coaxial cable CA2 whose characteristic impedance is Zo, the length L2 of the coaxial cable is 1/4 wavelength (λg/4) of the operating frequency of 2.4GHz. This embodiment takes the operating frequency of 2.4GHz as an example to illustrate, but The invention is not limited thereby. Match the impedance R1 achieved in Figure 3 to Z2 (equal to 50Ω), where the coaxial cable CA2 It is worth mentioning that when the following two or more coaxial cables are connected to each other, the inner conductors and conductive shields of adjacent coaxial cables are connected alternately. For a detailed description of the connection method, refer to the description of FIG. 10 , and then first explain the principle of impedance matching.

Please refer to FIG. 5 and FIG. 6 at the same time. FIG. 6 is a schematic diagram of adjusting the impedance matching of the earphone antenna provided by another embodiment of the present invention. Since the impedance Z2 achieved in Figure 2 has been matched to 50Ω, any coaxial cable CA3 with an arbitrary length L3 is regarded as the same coaxial cable, and its length does not affect the antenna (that is, including the coaxial cable CA1 and Coaxial cable CA2, the matching characteristics of the length of the two lines is L1+L2), so it can be any length, that is, the total length (including coaxial cable CA1, coaxial cable CA2 and coaxial cable CA3, length and L1+L2+L3) can be of any length without affecting the resonance of the antenna.

Please refer to FIG. 7 . FIG. 7 is a schematic diagram of the connection relationship of components of a wireless earphone provided by another embodiment of the present invention. In practice, the audio amplifier Amp1 (ie, the audio amplifier 122 a in FIG. 2 ) is coupled to the coaxial cables CA1 , CA2 , and CA3 through the radio frequency choke coils 124 , 125 to transmit the audio signal to the earphone SP1 . The radio frequency circuit unit RF (that is, the radio frequency circuit unit 121 in Figure 2) is connected to the coaxial cable CA3 through the radio frequency coupling capacitor 123, and then the antenna composed of the earphone SP1 and the coaxial cable CA1 and CA2 performs transmission or reception. RF signal. In addition, the node A of the coaxial cable CA3 is also an audio signal feeding point and cannot be directly grounded, so the node A is used as the radio frequency ground through the radio frequency coupling capacitor C2.

The above descriptions are only examples of the present invention, and are not intended to limit the scope of the claims of the present invention. For example, the number of coaxial cable wires can be increased to increase the antenna length and increase the antenna gain. As shown in FIG. 8 , FIG. 8 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by another embodiment of the present invention. The coaxial cable CA2' is composed of three coaxial cables whose lengths are L2A, L2B and L2C respectively. Furthermore, since the coaxial cable CA3 (with a length of L3 ) functions only as a coaxial cable and has no matching function, it can be of any length, or even be 0 in length.

Alternatively, as shown in FIG. 9 , FIG. 9 is a schematic diagram of adjusting impedance matching of an earphone antenna provided by another embodiment of the present invention. Although the coaxial cable CA2' in Figure 8 is a characteristic impedance And the matching antenna (earphone SP1 plus coaxial cable CA1) whose length=1/4 wavelength is a 50Ω matching element can also be replaced by a matching circuit M1 composed of inductors, capacitors and other physical elements.

Next, please refer to FIG. 10 . FIG. 10 is a schematic diagram of the connection relationship of the first coaxial cable, the second coaxial cable and the third coaxial cable of the wireless earphone provided by another embodiment of the present invention. In this embodiment, the first coaxial cable 13 of the previous embodiment is connected in series with at least one coaxial cable in the form of a collinear antenna to increase the gain of the antenna. As shown in Figure 7, the first coaxial cable 13 of the previous embodiment can be replaced by the first coaxial cable 13' and the second coaxial cable 14 connected in a column, or connected in a column The first coaxial cable 13 ′, the second coaxial cable 14 and the third coaxial cable 15 . The first coaxial cable 13 is substantially the same as the first coaxial cable 13', the only difference being that the lengths of the first coaxial cable 13 and the first coaxial cable 13' may be different. The second coaxial cable 14 has a second inner conductor 141 , a second insulating layer 142 and a second conductive shield 143 . The third coaxial cable 15 has a third inner conductor 151 , a third insulating layer 152 and a third conductive shield 153 .

The so-called tandem connection is described in detail below. When the first coaxial cable 13 is replaced by the first coaxial cable 13 ′ and the second coaxial cable 14 connected in a column, the second coaxial cable 14 is coupled to the first coaxial cable 13 ' between the second end P1 and the audio amplifier 122a. In more detail, the contact of the first conductive shield 133' adjacent to the second end P1 is coupled to the RF coupling capacitor 123 and the second RF choke coil 125 through the second inner conductor 141. The contact point of the first inner conductor 131' adjacent to the second terminal P1 is coupled to the first RF choke coil 124 through the second conductive shield 133.

When the first coaxial cable 13 is replaced by the first coaxial cable 13', the second coaxial cable 14 and the third coaxial cable 15 connected in a column form, the third coaxial cable 15 is coupled Between the second coaxial cable 14 and the audio amplifier 122a. In more detail, the second inner conductor 141 is coupled to the third conductive shield 153 , and the second conductive shield 143 is coupled to the third inner conductor 151 . The third conductive shield 153 is coupled to the RF coupling capacitor 123 and the second RF choke 125 , and the third inner conductor 153 is coupled to the first RF choke 124 . In terms of impedance, the length of the third coaxial cable 15 can be adjusted according to the product design of the wireless earphone, and the length of the third coaxial cable 15 does not affect impedance matching.

[Possible effects of the embodiment]

According to an embodiment of the present invention, the above-mentioned antenna for a wireless earphone and its wireless earphone, the antenna for a wireless earphone and its wireless earphone can transmit audio signals through a coaxial cable, and at the same time use the conductive shielding of the coaxial cable as a An antenna radiating element for sending and receiving radio frequency signals. In addition, multiple coaxial cables can be connected in series in the form of a collinear antenna to increase the gain of the antenna.

The above descriptions are only examples of the present invention, and are not intended to limit the scope of the claims of the present invention.

Claims (10)

1. a kind of antenna for wireless headset, it is characterised in that the antenna for wireless headset includes：

One first coaxial wire, first coaxial wire have a first end and one second end, and the first end is used To couple a pronunciation unit, to couple an audio frequency amplifier, first coaxial wire will be from described at second end The audio signal of audio frequency amplifier is transferred to the pronunciation unit, and first coaxial wire includes：

One first inner wire；

One first insulating barrier, first insulating barrier surround first inner wire；And

One first conductive shield, first conductive shield surround first insulating barrier, first conductive shield it is neighbouring The contact at second end to couple a radio circuit unit, wherein, first conductive shield is used as wireless receiving and dispatching radio frequency The Department of Radiation of signal；

One RF-coupled electric capacity, the contact at neighbouring described second end of first conductive shield pass through the RF-coupled electric capacity The radio circuit unit is coupled, wherein, the RF-coupled electric capacity passes through the radiofrequency signal, and stops from the sound The audio signal of audio amplifier enters the radio circuit unit；

One first radio frequency choke coil, the audio frequency amplifier couple first inner wire by the first radio frequency choke coil The contact at neighbouring second end；And

One second radio frequency choke coil, the audio frequency amplifier couple first conductive shield by the second radio frequency choke coil Neighbouring described second end contact；

Wherein, the first radio frequency choke coil and the second radio frequency choke coil make the audio frequency letter of the audio frequency amplifier Number pass through, and stop that the radiofrequency signal enters the audio frequency amplifier.

2. the antenna for wireless headset according to claim 1, it is characterised in that frequency band of the antenna in 2.4GHz Lower operation, the length of first coaxial wire is between 6 centimetres to 8 centimetres.

3. the antenna for wireless headset according to claim 1, it is characterised in that the length of first coaxial wire Between 0.5 times and 0.65 times of wavelength corresponding to operation frequency of the degree between the antenna.

4. the antenna for wireless headset according to claim 1, the antenna for wireless headset also include：

One second coaxial wire, second coaxial wire have one second inner wire, one second insulating barrier and one the Two conductive shields, second coaxial wire are coupled to second end of first coaxial wire and are put with the audio frequency Between big device, wherein, the contact at neighbouring described second end of first conductive shield is coupled by second inner wire The RF-coupled electric capacity and the second radio frequency choke coil, the contact at neighbouring described second end of first inner wire lead to Cross second conductive shield and couple the first radio frequency choke coil.

5. the antenna for wireless headset according to claim 4, the antenna for wireless headset also include：

One triaxial cable line, the triaxial cable line have one the 3rd inner wire, one the 3rd insulating barrier and one the Three conductive shields, the triaxial cable line are coupled between second coaxial wire and the audio frequency amplifier, institute State the second inner wire and couple the 3rd conductive shield, second conductive shield couples the 3rd inner wire, wherein, it is described 3rd conductive shield couples the RF-coupled electric capacity and the second radio frequency choke coil, and the 3rd inner wire coupling is described First radio frequency choke coil.

6. a kind of wireless headset, it is characterised in that the wireless headset includes：

One control device, the control device include a radio circuit unit and an audio treatment unit, the Audio Processing Unit has an audio frequency amplifier；

One pronunciation unit；

One first coaxial wire, first coaxial wire have a first end and one second end, the first end coupling The pronunciation unit is connect, second end couples the audio frequency amplifier, and first coaxial wire will be from the audio frequency The audio signal of amplifier is transferred to the pronunciation unit, and first coaxial wire includes：

One first inner wire；

One first insulating barrier, first insulating barrier surround first inner wire；

And

One first conductive shield, first conductive shield surround first insulating barrier, first conductive shield it is neighbouring The contact at second end couples the radio circuit unit, wherein, first conductive shield is believed as wireless receiving and dispatching radio frequency Number Department of Radiation；

One RF-coupled electric capacity, the contact at neighbouring described second end of first conductive shield pass through the RF-coupled electric capacity The radio circuit unit is coupled, wherein, the RF-coupled electric capacity passes through the radiofrequency signal, and stops from the sound The audio signal of audio amplifier enters the radio circuit unit；

One first radio frequency choke coil, the audio frequency amplifier couple first inner wire by the first radio frequency choke coil The contact at neighbouring second end；And

One second radio frequency choke coil, the audio frequency amplifier couple first conductive shield by the second radio frequency choke coil Neighbouring described second end contact；

Wherein, the first radio frequency choke coil and the second radio frequency choke coil make the audio frequency letter of the audio frequency amplifier Number pass through, and stop that the radiofrequency signal enters the audio frequency amplifier.

7. wireless headset according to claim 6, it is characterised in that the radiation that the first conducting screen covert is formed Portion is operated under the frequency band of 2.4GHz, and the length of first coaxial wire is between 6 centimetres to 8 centimetres.

8. wireless headset according to claim 6, it is characterised in that the length of first coaxial wire is between described Between 0.5 times and 0.65 times of wavelength corresponding to the operation frequency of the Department of Radiation that the first conducting screen covert is formed.

9. wireless headset according to claim 6, the wireless headset also include：

One second coaxial wire, second coaxial wire have one second inner wire, one second insulating barrier and one the Two conductive shields, second coaxial wire are coupled to second end of first coaxial wire and are put with the audio frequency Between big device, wherein, the contact at neighbouring described second end of first conductive shield is coupled by second inner wire The RF-coupled electric capacity and the second radio frequency choke coil, the contact at neighbouring described second end of first inner wire lead to Cross second conductive shield and couple the first radio frequency choke coil.

10. wireless headset according to claim 9, the wireless headset also include：

One triaxial cable line, the triaxial cable line have one the 3rd inner wire, one the 3rd insulating barrier and one the Three conductive shields, the triaxial cable line are coupled between second coaxial wire and the audio frequency amplifier, institute State the second inner wire and couple the 3rd conductive shield, second conductive shield couples the 3rd inner wire, wherein, it is described 3rd conductive shield couples the RF-coupled electric capacity and the second radio frequency choke coil, and the 3rd inner wire coupling is described First radio frequency choke coil.