KR101172073B1 - Earphone having helical structure and mobile receiver connected thereof - Google Patents

Abstract

An earphone antenna having a helical structure and a portable receiving device connected thereto are provided. The earphone antenna having the helical structure includes an earphone plug having a voice signal terminal and an antenna terminal; A voice signal line of a predetermined length for transferring a voice signal input from the voice signal terminal of the earphone plug to the sounding body; The earphone wire member is formed of a helical wire wound at equal intervals with a predetermined inclination angle while being insulated from an outer circumference of the voice signal line and connected to the earphone antenna terminal. The portable device connected to the helical earphone antenna is electrically coupled to the earphone plug through an earphone jack, and independently of the high frequency signal guided by the helical wire by the combination of the earphone jack and the earphone plug. It is configured to provide the antenna terminal of the FM tuner.

Helical antenna, earphone antenna, helical wire, reception sensitivity, FM receiver,

Description

Earphone antenna having a helical structure and a portable receiving device connected thereto {EARPHONE HAVING HELICAL STRUCTURE AND MOBILE RECEIVER CONNECTED THEREOF}

1 is a block diagram of a portable device using a ground wire of an earphone as an antenna according to the related art.

2 is a view showing the structure of a helical earphone antenna according to an embodiment of the present invention.

3 is an equivalent circuit diagram of the helical earphone antenna shown in FIG.

Figure 4 is a block diagram of a portable device connected to the earphone antenna having a helical structure according to an embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS to the main parts of the drawings "

10: portable device, 12: power supply device,

14: FM tuner, 16: amplifier,

18, 32: combiner, 24. 26: antenna coil,

22, 30: earphone plug, 40a, 40b: voice signal wire,

42a, 42b, 46, 50: insulation coating, 44: ground wire,

48: helical wire, EWM: earphone wire member.

The present invention relates to an earphone antenna and a mobile radio receiver connected thereto, and more particularly, to an earphone antenna having a helical winding structure and a portable receiving device connected thereto.

Typically, products such as portable radio receivers (mobile devices) having an RF receiver (e.g., an MP3 player, a mobile phone, etc.) incorporating a radio receiver are used. It is common practice to implement antennas in earphones because it is a common trend to have compact designs.

An example of applying the earphone antenna as described above can be seen in many products, but a representative example is a portable multimedia player produced by LG Electronics Co., Ltd. under the product model name "X-Free MF-HE700". have.

In addition to the above products, many portable radio receivers (hereinafter referred to as "portable devices") use the ground wire of the earphone as the RF antenna. In general, the earphone antenna is properly designed and implemented in terms of the diameter and length of the ground line of the voice signal transmission path for transmitting the voice signal output from the portable device to the speaker of the earphone in consideration of the reception band frequency wavelength of the corresponding receiver.

In addition, a portable device that provides a high frequency signal received by the earphone antenna as an internal tuner through an electrical connection may properly separate a radio frequency signal and an audio frequency signal and receive only a high frequency signal. It is equipped with an FM tuner and has a signal separator to improve the signal-to-noise ratio by bypassing the voiceband signal to ground. Such signal separation is generally implemented using a coil.

Connection between the earphone antenna and the portable device is shown in FIG.

1 is a high frequency signal interface circuit diagram of a portable apparatus using a ground line of a voice signal line for transmitting a voice signal of an earphone as an antenna according to the related art.

In FIG. 1, reference numeral 10 denotes a portable device having a function of selectively receiving and demodulating only a desired frequency from a radio wave propagated high frequency signal.

The portable device 10 shown in FIG. 1 stabilizes a power source, for example, the battery's power supply V _BAT , as will be apparent to those skilled in the art. A power supply device 12 for stably supplying a power supply voltage Vs is provided. The power supply device 12 is configured to supply a voltage required by each circuit part of the portable device 10 according to a switching control frequency of a DC voltage input as a DC to DC converter which is a switching regulator. This is a common example.

The FM tuner 14 operated by the power supply voltage Vs output from the power supply 12 is a corresponding channel in the RF signal received at the antenna terminal ANT in response to the channel selection signal SEL. Only demodulated signals are inputted to the amplifier 16 by the stereo audio signals R_CH and L_CH.

The amplifier 16 amplifies the input stereo audio signals R_CH and L_CH and amplifies the audio signal terminals CP11 and CP12 of a plug coupler 18 such as an earphone jack connected to an output node. Is provided.

The plug coupler 18 further includes several terminals in addition to the audio signal terminals CP11 and CP12. For example, an antenna terminal CP13 for inputting an RF signal and a ground terminal CP14 for transmitting an audio signal. The antenna terminal 13 and the ground terminal CP14 are connected to the antenna terminal ANT of the FM tuner 14 by being connected to the other side of the antenna coil 24 having one side of the analog ground A_GND. The ground A_GND is connected to the digital ground D_GND through the coil 26.

Meanwhile, the earphone plug 22 inserted into the plug coupler 18 is connected to the voice signal terminals CP11 and CP12 of the plug coupler 18 to receive voice signals R_CH and L_CH transmitted therefrom. Two audio signal terminals CP21 and CP22 respectively transmitted to the left and right earphone speakers (not shown) and the ground terminals CP13 and CP14 of the plug coupler 18 through the audio signal line. The ground terminal CP23, which connects to a ground wire or shield wire (not shown), is spaced apart and coupled to one body. At this time, the voice signal terminals CP21 and CP22 and the antenna terminal CP23 of the earphone plug 22 are insulated from each other.

Although not shown in detail in FIG. 1, the e-phone plug 22 has a predetermined length, for example, a length of 1 / n (where n is an integer such as 2 or 4) of a wavelength ?? The wire formed to have is configured to pick up the high frequency of the FM band in the air and deliver it to the antenna terminal CP23 which serves as both the ground and the antenna terminal. That is, the earphone plug 22 that is inserted into and coupled to the earphone jack 18 of the portable device 10 has a voice signal line and ground for connecting the voice signal of the voice signal terminals CP21 and CP22 of FIG. 1 to the positive pole of the earphone speaker. It is recognized that three wires including a ground wire and an antenna wire for connecting the ground level signal of the antenna terminal CP23 to the cathode of the earphone speaker are connected.

When the earphone plug 22 is inserted into and coupled to the plug coupler 18 of the portable device 10 configured as shown in FIG. 1, the audio signal terminals CP11 and CP12 and the ground terminals CP13 and CP14 of the plug coupler 18 are connected. The audio signal plug terminals CP21 and CP22 and the ground terminals CP23 and CP24 of the earphone plug 22 are respectively connected.

At this time, a high frequency signal in the air is guided through a ground line serving as an antenna signal wire among three wires connected to the earphone plug 22. The high frequency signal picked up by the ground line is FM via the antenna terminal CP13 and the ground terminal CP14 and the antenna coil 14 of the plug coupler 18 connected to the ground terminal CP23 of the earphone plug 22. It is electrically connected to the antenna terminal ANT of the tuner 14.

In this state, when the battery voltage V _BAT is supplied, the power supply 12 supplies the battery voltage V _BAT to a preset level of power by a switching frequency output from an internal oscillation circuit. The voltage is converted to Vs and supplied to the FM tuner 14.

The FM tuner 14 is operated by the power supply voltage Vs and picks up and demodulates only a frequency of a channel corresponding to the channel selection signal SEL among the RF signals input to the antenna terminal ANT. The audio signals R_CH and L_CH are output to the amplifier 16.

At this time, the antenna coil 24 connected between the ground terminals CP13 and CP14 of the plug coupler 18 and the analog ground A_GND is received through the ground terminals CP13 and CP14 of the plug coupler 18. By having a high impedance with respect to the radio frequency of the signal (radio frequency) of the majority of the high frequency signal is provided to the antenna terminal (ANT) of the FM tuner (14).

As described above, the conventional portable device is configured to provide a high frequency signal to the FM tuner 14 using the antenna coil 24. However, the portable device 10 for receiving a high frequency signal received through the earphone wire simply as described above has a switching frequency of the power supply device 12 such as a switching regulator of the FM tuner 14 through the antenna coil 24. Inflow into the antenna terminal ANT has a problem of lowering the sensitivity of the FM tuner 14.

That is, the antenna coil 24 and the antenna coil 26 connected between the analog ground A_GND and the digital ground D_GND shown in FIG. However, the inductive reactance (W _L = 2πf) is lowered to a low impedance with respect to the voice frequency, thereby connecting the analog ground (A_GND) and the digital ground (D_GND). However, the antenna coils 24 and 26 may reverse the switching noise flowing from the digital ground D_GND of the power supply 12 to the analog ground A_GND to the antenna terminal ANT of the FM tuner 14. By providing a route, the sensitivity of the FM tuner 14 in the portable device 10 is reduced, resulting in a bad signal-to-noise ratio.

In addition, the earphone antenna having the structure as described above simply cannot pick up high frequency air in the air through the ground line surrounding the voice signal line of the E-phone, and thus cannot provide clean sound quality to the user.

Accordingly, an object of the present invention is to provide a structure of an earphone antenna having a helical structure capable of picking up a high frequency of a desired band among high frequency signals propagated to the atmosphere.

Another object of the present invention is to provide an RF interface circuit of a portable device capable of properly interfacing a high frequency signal picked up from an earphone antenna having a helical structure with an FM tuner.

Another object of the present invention is to provide an RF interface circuit of a portable device having a structure in which a switching noise signal inside the portable device and a high frequency signal picked up from an earphone antenna can be separated.

Earphone antenna of the present invention for achieving the above object is an earphone plug having a voice signal terminal and the antenna terminal; A voice signal line having a predetermined length for transmitting a voice signal input from the voice signal terminal of the earphone plug to a speaker; And an earphone wire member wound at equal intervals with a predetermined inclination angle insulated from the outer circumference of the voice signal line and formed of a helical wire connected to the earphone antenna terminal.

The earphone plug may be formed by insulating the voice signal terminal and the antenna terminal from each other, and further comprising a ground terminal insulated from the voice signal terminal and the antenna terminal.

The earphone wire member is insulated between the voice signal line and the helical wire to form a ground line surrounding the voice signal line, and the ground wire is connected to the ground terminal of the earphone plug.

The ground line may be formed of a bare wire to shield external noise.

The helical wire has a length of about 800 mm, and is formed by winding around the outer circumference of the ground line (barred copper wire) inclined at a constant inclination angle at equal intervals of 20 mm.

The surface of the helical wire is required to form an insulating coating so that a constant gap of the helical wire is not twisted. If necessary, the helical wire is preferably bonded to the surface of the voice signal line and fixed.

The portable device of the present invention for achieving the above object is a voice signal line for transmitting a voice signal of the voice signal terminal to the sounding body, and a helical wire wound at equal intervals with a predetermined inclination angle in the outer circumference of the voice signal line A helical earphone antenna having a; An FM tuner which is operated by input of a power voltage and picks up and demodulates a high frequency signal of a corresponding channel among high frequency signals inputted to an antenna terminal in response to a pre-international language signal and outputs a voice signal; And a coupler for electrically connecting the voice signal output terminal and the antenna terminal of the FM tuner to the voice signal terminal and the helical wire of the helical earphone antenna by coupling with the helical earphone antenna.

The coupler is preferably an earphone jack.

The helical earphone antenna of the portable device includes an earphone plug having a voice signal terminal and an antenna terminal and fitted to the earphone jack; A voice signal line having a predetermined length for transmitting a voice signal input from the voice signal terminal of the earphone plug to a speaker; The earphone wire member may be formed of a helical wire wound at equal intervals with a predetermined inclination angle while being insulated from an outer circumference of the voice signal line and connected to the earphone antenna terminal.

Preferably, the earphone plug of the helical earphone antenna is insulated from the voice signal terminal and the antenna terminal, and the earphone plug further includes a ground terminal insulated from the voice signal terminal and the antenna terminal.

The earphone wire member of the helical earphone antenna is insulated from the voice signal wire and the helical wire to form a ground wire surrounding the voice signal wire, and the ground wire is connected to the ground terminal of the earphone plug. Do.

The ground line of the helical earphone antenna may be formed of a bare wire to shield external noise.

The helical wire of the helical earphone antenna has a length of about 800 mm, and may be formed to be wound around the outer circumference of the spiral inclined at a constant inclination angle at equal intervals of 20 mm.

The surface of the helical wire of the helical earphone antenna is required to form an insulating coating so that a constant distance of the helical wire is not twisted. If necessary, the helical wire is preferably bonded to the surface of the voice signal line and fixed.

An amplifier for amplifying the demodulated output audio signal may be connected between the FM tuner and the audio signal terminal of the earphone jack, and an amplifier may be incorporated in the FM tuner if necessary.

The earphone antenna having the helical structure configured as described above picks up high-frequency signals in the air by a helical wire formed on the outer circumference of the voice signal line for transmitting the voice signal to the sounding body, and independently provides them to the FM tuner of the mobile device. Interference from switching noise can be eliminated, allowing the best sensitivity of the FM tuner.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings in which: FIG. It should be understood, however, that the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be noted that the embodiments of the present invention described below are only for explaining the spirit of the present invention to a person skilled in the art, and a detailed description of known functions and configurations of the present invention which may unnecessarily obscure the gist of the present invention It should be noted that it is omitted.

2 is a view showing the structure of a helical earphone antenna according to an embodiment of the present invention. Referring to FIG. 2, the earphone wire member (EWM) of the helical earphone antenna has two central conducting wires, for example, audio signals of R_CH and L_CH in stereo, and the two speakers of earphones. That is, the voice signal lines 40a and 40b transmitted to the speaker are covered, and the voice signal lines 40a and 40b are covered with the insulators 42a and 42b, and the outer circumference of the insulators 42a and 42b is shielded. (shield line), for example, a bare lead line was coat | covered with the ground line 44. As shown in FIG. The outer surface of the ground wire 44 is covered with an insulating coating 46, for example, an insulating tape, and the copper wire having a predetermined diameter is wrapped around the outer surface of the insulating coating 46 at a predetermined inclination angle. Inclined to form a helical wire 48 wound at a constant equal interval (Wth), and the outside thereof is covered by an insulating jacket 50 that is an insulating jacket.

In this case, the helical wire 48 is preferably wound in a spiral shape with its length to be high-impedance in the frequency band of the FM tuner of Korea.

Although not shown in detail in FIG. 2, one side of the voice signal lines 40a and 40b, which are the center lines of the earphone wire member EWM of FIG. 2, are separated from the voice signal terminals of the plug of the earphone, like a normal earphone. The other side is connected to each anode of the two speakers of the stereo earphone, and the bare copper wire, that is, the ground line 44, is connected to the ground terminal of the earphone plug and the cathode of the two speakers, respectively. One side of the helical wire 48 is connected to the antenna terminal of the earphone plug and the other is open.

3 is an equivalent circuit diagram of the helical earphone antenna shown in FIG. 2. In the drawing, reference numeral L is an inductive reactance, and is an inductance value of the helical wire in the longitudinal direction indicated by LE in FIG. 2, and C is a capacitive reactance, which is formed in the gap Wth of the helical wire 48 in FIG. It means the value of the capacity. Therefore, the helical wire 48 is fixedly attached to the outer circumference of the insulating coating 46 of the ground wire 44 so that the value of each floating capacitance formed according to the distance wth of the helical wire 48 does not change. It is preferable. Such attachment may be applied using a bond or by applying heat to the surface of the thermal insulation coating 46 to melt.

As shown in FIG. 2, the helical wire 48 spirally wound around the outermost circumferences of the voice signal lines 40a and 40b, which is the center line of the earphone wire member EWM, forms a LC parallel circuit as shown in FIG. It is expressed as Equation 1 below.

[Equation 1]

Therefore, it can be seen that the resonance frequency fo can be appropriately set by adjusting the winding length LE and the interval Wth of the helical wire 48 having the configuration as shown in FIG. 2.

According to the experiment, when the diameter of the ground wire 44 is coated with the insulator 46 is 2.5 ㅁ 1 ??, the length of the helical wire 48 is 800 mm and the spacing Wth is 20 mm. It was confirmed that the FM tuner band has an optimal impedance value.

The earphone antenna having the helical structure configured as described above has two voice signal lines 40a and 40b for transmitting a voice signal input to the earphone plug to the stereo speaker and an outer portion of the insulator 46 coated on the ground line 44. The length LE and spacing Wth of the helical wire 48 wound in a circumference can be properly adjusted to facilitate the resonant frequency fo for picking up the FM tuner among many high frequency signals propagated to the atmosphere. The frequency band can be easily guided (picked up).

According to an exemplary embodiment of the present invention, the earphone antenna having a helical structure configured as shown in FIG. 2 may be very usefully applied to a portable device manufactured with a small size by embedding an FM tuner. In the following description, receiving a frequency of an FM tuner band (80 MHz to 108 MHz) in combination with a portable device is described.

4 is a block diagram of a portable device connected to an earphone antenna having a helical structure according to an exemplary embodiment of the present invention. 3 is a structure of an earphone plug 30 to which an earphone wire member EWM of an earphone antenna having a helical antenna structure shown in FIG. 2 is connected, and a coupler coupled to the earphone plug 30, for example, It is the same as FIG. 1 except that the shape of the earphone jack 32 and the connection structure between the earphone jack 32 and the amplifier 16 and the antenna terminal ANT of the FM tuner 14 are different.

Referring to FIG. 4, the audio signal terminals CP11 and CP12 and the antenna terminal CP13 of the combiner 32 are the stereo audio signals R_CH and L_CH of the amplifier 16 and the antenna terminals ANT of the FM tuner 14. ), And the ground terminal CP14 is connected to the analog ground terminal A_GND of the portable device 10.

The voice signal terminals CP21 and CP22, the antenna terminal CP23, and the ground terminal CP24 of the earphone plug 30 are connected to the earphone jack 32 when the earphone plug 30 is inserted into the earphone jack 32. It has an appropriate shape and length so as to be connected to the audio signal terminals CP11 and CP12, the antenna terminal CP13 and the ground terminal CP14, respectively.

 In addition, although not shown in FIG. 4, each of the audio signal terminals CP21 and CP22, the antenna terminal CP23, and the ground terminal CP24 of the earphone plug 30 may be connected to the earphone wire member EWM of FIG. 2. The audio signal lines 40a and 40b, the helical wire 48, and the bare copper wire (ground line) 44 are respectively connected. The other side of the earphone wire member EWM is connected to two speakers as described above.

As described above, when one of the earphone plugs 30 connected to the earphone wire member (EMW) connected to the anode and the cathode of the two speakers constituting the stereo speaker is coupled to the coupler, that is, the earphone jack 32, The audio signal terminals CP21 and CP22, the antenna terminal CP23, and the ground terminal CP24 of the earphone plug 30 are the audio signal terminals CP11 and CP12, the antenna terminal CP13, and the ground terminal of the earphone jack 32. It is connected to CP14 independently.

At this time, the helical wire 48 having the equivalent circuit configuration as shown in FIG. 3 picks up the high frequency of the corresponding band by the resonance frequency fo by the inductive reactance L and the capacitive reactance C from the high frequency signal in the air. Waveguide is made to the antenna terminal CP23 of the earphone plug 30. The antenna terminal CP13 of the earphone jack 32 is connected to the antenna terminal CP23 of the earphone plug 30. Therefore, it can be seen that the high frequency signal picked up and guided by the helical wire 48 is provided to the antenna terminal ANT of the FM tuner 14.

Therefore, the high frequency signal picked up and guided by the helical wire 48 of the earphone antenna by the circuit configuration of FIGS. 2 and 4 is tuned through the antenna terminals CP13 and CP23 separately provided from the analog ground A_GND. 14, the portable device 10 can be operated so that the power supply 12, which is composed of a switching regulator, can be operated, thereby deviating from the interference of the switching frequency and thus the switching noise.

When the portable device 10 is operated to supply the power voltage Vs from the power supply 12 to the FM tuner 14, the FM tuner 14 is connected to the antenna terminal ANT by the channel selection signal SEL. Detects only the frequency of the corresponding channel among the high frequency signals inputted to the L-CH, and outputs demodulated stereo audio signals R_CH and L_CH to the amplifier 16.

The amplifier 16 amplifies the input stereo audio signals R_CH and L_CH to a predetermined level and outputs them to the audio signal terminals CP11 and CP12 of the earphone jack 32, and the audio signal terminals of the earphone jack 32. The stereo voice signals R_CH and L_CH of the CP11 and CP12 are transferred to the anodes of the two speakers by the voice signal terminals CP21 and CP22 and the voice signal lines 40a and 40b of the earphone plug 30 to be converted into an audible sound. do.

According to the experiment, the length of the helical wire 48 is 800 mm when the diameter when the insulator 46 is coated on the ground wire 44 of the earphone wire member EWM shown in FIG. 2 is 2.5 ± 0.5θ. And when winding the distance (Wth) to 20mm was confirmed that the improvement effect of about 5dB in the FM tuner band of Korea.

By applying an RF interface having a helical earphone earphone and a four-hole earphone coupling structure (earphone jack and earphone plug) according to the embodiment to a portable device, an antenna line into which a high frequency signal is introduced is connected to a digital ground (D_GND) of the portable device. By separating from the analog ground A_GND, it is possible to eliminate the noise high frequency flowing into the antenna terminal of the tuner 14, thereby improving the signal-to-noise ratio and further increasing the reception sensitivity of the tuner.

In addition, the embodiment of the present invention shows an example in which the amplifier is configured independently, those skilled in the art that the FM tuner may be omitted if the built-in amplifier or the voice signal output from the FM tuner is sufficient. It should be recognized that it is self-explanatory.

In addition, in the embodiment of the present invention, the connection between the portable device 10 and the earphone antenna has been described as using the earphone jack and the earphone plug, but it should be noted that they may be connected in various forms. For example, it can be combined using a wire harness connector, which is widely applied in portable telephones, portable multimedia players (PMPs), and the like, and these components are equivalent to earphone jacks and earphone plugs in the specification of the present invention. It should be noted that one is.

As described above, the earphone antenna according to the embodiment of the present invention picks up and guides a high frequency signal of a desired band among high frequencies in the air by a helical wire which is insulated from the voice signal line to which the voice signal is transmitted and the ground line, The high frequency pickup picked up by the helical wire of the earphone antenna may be independently supplied to the tuner through a separately provided conductor, thereby increasing the reception sensitivity of the portable device.

Claims (14)

In the earphone antenna, An earphone plug having a voice signal terminal and an antenna terminal; A voice signal line of a predetermined length for transferring a voice signal input from the voice signal terminal of the earphone plug to the sounding body; Earphone antenna having a helical structure, characterized in that the earphone wire member is formed of a helical wire wound at equal intervals with a predetermined inclination angle insulated from the outer periphery of the voice signal line. The helical structure according to claim 1, wherein the earphone plug is formed by insulating the voice signal terminal and the antenna terminal from each other, and the earphone plug includes a ground terminal insulated from the voice signal terminal and the antenna terminal. Having earphone antenna. The earphone wire member of claim 2, wherein the earphone wire member is insulated between the voice signal line and the helical wire to form a ground line surrounding the voice signal line, and the ground wire is connected to the ground terminal of the earphone plug. Earphone antenna with helical structure. The earphone antenna of claim 3, wherein the ground line is formed of a spiral interlocking line to block external noise. The earphone antenna according to claim 4, wherein the surface of the helical wire is formed on an insulating coating so that the helical wire is attached to the ground line such that a predetermined gap of the helical wire is not twisted. 6. The helical wire of claim 5, wherein the length of the helical wire is about 800 mm when the diameter of the helical wire to the insulation coating surrounding the ground wire is about 2.5 ± 0.5θ, and is inclined at a constant inclination angle at an equal interval of 20 mm. Earphone antenna having a helical structure, characterized in that wound around the outer periphery. In the portable device coupled to the earphone antenna, A helical earphone antenna having a voice signal line for transmitting a voice signal of a voice signal terminal to a sounding body, and a helical wire wound at equal intervals and insulated from the voice signal line with a predetermined inclination angle; An FM tuner which is operated by input of a power voltage and picks up and demodulates a high frequency signal of a corresponding channel among high frequency signals inputted to an antenna terminal in response to a pre-international language signal and outputs a voice signal; And a coupler for electrically connecting the voice signal output terminal and the antenna terminal of the FM tuner to the voice signal terminal and the helical wire of the helical earphone antenna by coupling with the helical earphone antenna. Portable device combined. 10. The helical earphone antenna of claim 7, wherein the coupler comprises: an antenna terminal for connecting the high frequency signal guided from the helical earphone antenna of the helical earphone antenna to the antenna terminal of the tuner; A portable device coupled to an earphone antenna, wherein the earphone jack has a voice signal terminal to be connected and a ground terminal connected to the ground of the portable device. The helical earphone antenna of claim 8, further comprising: an earphone plug having a voice signal terminal and an antenna terminal, the earphone plug being coupled to the earphone jack; A voice signal line having a predetermined length for transmitting a voice signal input from the voice signal terminal of the earphone plug to a sounding body; And a earphone wire member wound at equal intervals with a predetermined inclination angle while being insulated from an outer circumference of the voice signal line and formed of a helical wire connected to the earphone antenna terminal. The grounding device of claim 9, wherein the earphone plug of the helical earphone antenna is insulated from the voice signal terminal and the antenna terminal, and is insulated from the voice signal terminal and the antenna terminal and connected to the ground of the portable device through the earphone jack. A portable device coupled to the earphone antenna, characterized in that comprising a terminal. The earphone wire member of the helical earphone antenna of the helical earphone antenna is insulated between the voice signal line and the helical wire to form a ground line surrounding the voice signal line, the ground line is the ground of the earphone plug A portable device coupled to the earphone antenna, characterized in that connected to the terminal. 12. The portable device of claim 11, wherein the ground line of the helical earphone antenna is formed of a bare copper wire to block external noise. The method of claim 12, wherein the helical wire is about 800mm in length when the diameter of the helical wire to the insulating coating surrounding the ground wire is about 2.5 ± 0.5θ, and the slope of the ground wire is inclined at a constant inclination angle of 20mm. Portable device coupled to the earphone antenna, characterized in that formed around the outer circumference. 13. The portable device of claim 12, wherein a surface of the helical wire forms an insulating coating and is attached to the ground line such that a predetermined gap of the helical wire is not twisted.

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