KR20050053929A - Multiband helical antenna using dual coil - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a multi-band helical antenna using a double coil.

2. The technical problem to be solved by the invention

The present invention provides a multi-band helical antenna using a double coil for operating in at least triple band by additionally arranging a second coil operating in a different frequency band to a first coil operating in a dual band. There is a purpose.

3. Summary of Solution to Invention

The present invention provides a double coil having a coaxial cable for feeding, a ground plane disposed to be connected to an outer conductor of the coaxial cable, and at least two coils arranged to be connected to a central conductor of the coaxial cable. A multi-band helical antenna comprising: a first coil composed of different coil pitches for resonating in a dual band; And a second coil comprising a coil pitch for resonating in a different band from the first coil, wherein the first and second coils are arranged in parallel.

4. Important uses of the invention

The present invention is used in a mobile communication terminal.

Description

Multiband Helical Antenna using Dual Coil}

The present invention relates to a multi-band helical antenna using a double coil, and more particularly, to a multi-band using a double coil applied to a mobile communication terminal used in a triple-band (Tri-Band) system to enable triple resonance using a double coil structure. It relates to a band helical antenna.

In general, a mobile communication terminal is a mobile communication means that allows a user to make a call with a desired partner regardless of a place or time, that is, outdoors or indoors where a user is moving, and the use population of mobile communication devices is increasing according to industrial development. Increasingly, the trend is increasing, and it is marketed in various forms of designs, making it a necessity for modern people regardless of age or gender.

The mobile communication terminal includes a cellular phone, a personal communication service (PCS), a personal digital assistant (PDA), and the like. In detail, there are two types, flip type and clam type.

Among these, the clamshell mobile communication terminal is small in size and light in weight, which is easy to carry. Due to these advantages, the folder type mobile communication terminal has become the most popular model in the mobile communication market, and various studies have been made for ultra-slip and ultra-lightweight mobile phones.

1 is a structural diagram of a general mobile communication terminal.

As shown in the drawing, a general mobile communication terminal has various electronic components embedded therein, and an upper end of one side has a body 110 having an antenna 200 installed thereon, and the front of the body 110 is pressed by a user. Several keypad unit 120 is configured to turn on / off a call or dial by a display unit, and a display unit for displaying a telephone number input and an operation state by a pressing operation of the keypad unit 120. 130 is provided.

In addition, a transmitter / receiver 140, which is provided on the upper side and the keypad 120 or the cover side of the display 130, respectively, is configured, and into the body 110 provided with the transmitter / receiver 140. Battery pack 150 for charging the electricity to supply power is detachably mounted on the back of the body (110).

FIG. 2 is a detailed structural diagram of the antenna of FIG. 1 and illustrates a retractable antenna.

As shown in the figure, the antenna of the general mobile communication terminal, the receiving space 111 is provided with an antenna therein, the body 110 is formed with a screw hole 112 in the upper portion of the receiving space 111. ) Is formed, the screw hole 112 is rotated and fixed in a predetermined direction, and a through hole 211 is formed therein, and a helical antenna 210 for transmitting / receiving a high frequency signal is configured. The hooking jaw 221 is inserted to the end of the helical antenna 210 is inserted into the 211 is formed, it is also composed of a whip antenna 220 of the iron core 222 therein, the accommodation space 111 ) Is seated inside.

In the conventional antenna configured as described above, when the user uses the terminal, when the user pulls the antenna 200, the antenna 200 protrudes more than a predetermined length vertically of the terminal, and the locking step 221 of the whip antenna 220 is performed. ) Is moved upward until it is caught by the end of the helical antenna (210).

A helical antenna is a type of antenna in which a coil, which is a spiral conductor, is connected to a central conductor of a coaxial cable, and an outer conductor of the coaxial cable is connected to a ground plane.

On the other hand, when a mobile communication terminal is used in a dual band system such as a Global System for Mobile Communications (GSM), the antenna of the mobile communication terminal should be designed to be suitable for dual resonance. In this case, it is common that the helical antenna is designed to exhibit double resonance.

3 is a schematic diagram of a general double resonant helical antenna.

In the manufacture of the helical antenna, factors affecting the characteristics of the antenna, such as the material of the coil, the thickness of the coil, the diameter (D) of the coil, and the overall length of the coil, are various, but in order to achieve resonance in a desired frequency band, Mainly, a method of adjusting the pitch between coils (hereinafter, referred to as 'coil pitch') has been used.

At this time, the helical antenna used in the single frequency band is constant coil pitch, but the helical antenna used in the dual band has a double coil pitch, as shown in FIG. Make it possible.

FIG. 4 is an example of a graph for describing resonance characteristics of the helical antenna of FIG. 3.

As shown in the figure, the double resonant helical antenna generates a primary resonance in the 800 MHz band and a secondary resonance occurs in the 1900 MHz band, which is suitable for use in a dual band mobile communication system.

For example, the resonance point in the 800MHz band may operate as an antenna in a cellular mobile communication terminal, and the secondary resonance point in the 1900MHz band may operate as an antenna in a mobile communication terminal of a personal mobile communication (PCS) system.

However, as the mobile communication system is diversified, an antenna used in each frequency band is required for the mobile communication terminal to provide a corresponding service.

For example, in the case of FIG. 4, the cellular and personal mobile communication terminals may operate, but do not resonate in the 1500 MHz band, which is a satellite positioning system (GPS) band. You cannot use it.

That is, a helical antenna having a relatively simple structure is easy to manufacture to operate in a single band or a dual band, but it is difficult to manufacture a helical antenna operating in a triple band or more simply by adjusting a coil pitch.

The present invention has been proposed to solve the above problems, and by adding a second coil operating in a different frequency band to the first coil operating in the dual band, to operate in at least triple band It is an object of the present invention to provide a multi-band helical antenna using a double coil.

The present invention for achieving the above object is provided with a coaxial cable for feeding, the ground plane is arranged to be connected to the outer conductor of the coaxial cable and at least two coils arranged to be connected to the center conductor of the coaxial cable A multi-band helical antenna having a dual coil, comprising: a first coil having different coil pitches to resonate in the dual band; And a second coil comprising a coil pitch for resonating in a different band from the first coil, wherein the first and second coils are arranged in parallel. to provide.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same number as much as possible even if displayed on different drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a schematic diagram of an embodiment of a multi-band helical antenna using a double coil according to the present invention.

Originally, the helical antenna is arranged such that the coil is connected to the center conductor of the coaxial cable for feeding, and the outer conductor of the coaxial cable is arranged to be connected to the ground plane, which is one of ordinary skill in the art. It will be self-evident to you. In the description of the present invention, only the coil will be described with the coaxial cable and the ground plane omitted.

As shown in FIG. 5, the helical antenna of the present invention includes a first coil 510 for resonating in a dual band and a second coil 520 for resonating in another band.

As shown in the drawing, the first coil 510 and the second coil 520 may be disposed in parallel to the first coil 510. However, since the first and second coils 510 and 520 are not to be electrically shorted with each other, an insulator (not shown) may be covered with a conductor wire constituting the coil.

As described above, the coil pitch of the first and second coils 510 and 520 and the diameter D of the coil may be adjusted to suit the resonance frequency.

In an embodiment of the present invention, only the helical antenna operating in the triple band has been described. However, it is possible to adjust the coil pitch and increase the number of coils so that the multi-band operates in multiple bands. It is self-evident for those who have knowledge.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention has the effect of being able to operate in at least triple band by adding in parallel a first coil operating in a dual band and a second coil operating in a different frequency band.

In addition, the present invention has the effect of reducing the size of the mobile communication terminal by allowing the dual coil to be arranged in parallel so as to resonate in at least triple band or more, so as to allow resonance in several frequency bands with one antenna.

Furthermore, the present invention has the effect of being able to follow the trend of the current mobile communication terminal in which the frequency band used is diversified.

1 is a structural diagram of a general mobile communication terminal,

2 is a detailed structural diagram of the antenna of FIG.

3 is a schematic diagram of a general double resonant helical antenna,

4 is an example of a graph for explaining resonance characteristics of the helical antenna of FIG. 3;

Figure 5 is a schematic diagram of one embodiment of a multi-band helical antenna using a double coil according to the present invention.

* Explanation of symbols for the main parts of the drawings

110: body 111: accommodation space

112: screw hole 120: keypad portion

130: display unit 140: transmitting and receiving unit

150: battery pack 200: antenna

210: helical antenna 211: through hole

220: whip antenna 221: jamming jaw

222: iron core 510, 520: coil

Claims (2)

A multi-band helical antenna having a coaxial cable for feeding, a ground plane disposed to be connected to an outer conductor of the coaxial cable, and at least two coils arranged to be connected to a central conductor of the coaxial cable. To A first coil composed of different coil pitches for resonating in the dual band; And A second coil composed of a coil pitch for resonating in a different band from the first coil Including, The first and second coil, Arranged in parallel Multi-band helical antenna using a double coil characterized in that. The method of claim 1, The first and second coils, Insulated from conductor wires forming coils Multi-band helical antenna using a double coil characterized in that.