KR100817758B1 - The small size wideband built-in antenna with high electro-magnetic materials - Google Patents

Abstract

A small-sized wideband built-in antenna with high electro-magnetic materials is provided to be used as an antenna solution of a UHF(Ultra High Frequency) band such as a DVB-H(Digital Video Broadcasting-Handheld) built-in antenna or a T-DMB(Terrestrial Digital Multimedia Broadcasting) built-in antenna. A small-sized wideband built-in antenna with high electro-magnetic materials includes a feeding unit(210), a feeding pin(200), and a short pin(300). The feeding unit includes a ground plane(100), an FR-4 dielectric body and a feeding pad(220). The FR-4 dielectric body and the feeding pad are formed on one surface of a ground plane. The short pin is electrically connected to the ground plane and projects in a predetermined length. The feeding pin is connected to the feeding pad of the feeding unit to project in the predetermined length. The feeding pin supplies a signal from the outside.

Description

Small wideband built-in antenna with high electro-magnetic materials

1 is a planar inverted F antenna (PIFA) antenna using a conventional open stub.

Figure 2a is a top side view of a small broadband internal antenna using a material combined with a high dielectric and high magnetic material according to the present invention.

Figure 2b is a bottom side view of a small broadband internal antenna using a material combined with a high dielectric and high magnetic material according to the present invention.

FIG. 3 is a graph illustrating a return loss measurement result of the antenna of FIGS. 2A and 2B.

4 is a bottom side view illustrating a state in which a dielectric having a relative dielectric constant in a range of 6 to 40 is inserted into a lower portion of the antenna of FIGS. 2A and 2B.

5 is a graph illustrating a return loss measurement result of the antenna of FIG. 4.

6 is a bottom side view illustrating a state in which a dielectric having a relative dielectric constant in a range of 6 to 40 and a magnetic material having a relative permeability in a range of 6 to 100 are inserted into a lower portion of the antenna of FIGS. 2A and 2B.

7 is a graph illustrating a return loss measurement result of the antenna of FIG. 6.

FIG. 8 is a bottom side view illustrating a state in which a material in which a dielectric material having a relative dielectric constant in the range of 6 to 40 and a magnetic material having a relative permeability in the range of 6 to 100 is inserted into the lower part of the antenna of FIGS. 2A and 2B.

9 is a graph illustrating a return loss measurement result of the antenna of FIG. 8.

* Description of the main drawing codes *

100: ground plane 200: feed pin

210: feeder 220: feed pad

300: short circuit pin

400: open frequency stub emitter for low frequency

500: first high frequency open stub radiator

600: second high frequency open stub radiator

700: third high frequency open stub radiator

800 carrier 900 dielectric

1000: magnetic material 1100: a mixture of dielectric and magnetic material

The present invention relates to a small wideband internal antenna, and more particularly, to an antenna capable of satisfying the characteristics of a wideband and a multiband while maintaining the existing antenna bandwidth while reducing the antenna size when the antenna is embedded in a mobile communication terminal. will be.

An antenna is a device that converts an electric signal into a radio wave signal or vice versa. In the case of a transmitter, the electric signal to be sent from the transmitter is converted into a radio signal and sent to a far distance, and when the radio signal transmitted from a long distance is received, the radio signal is converted into an electric signal and transmitted to the receiver.

A simple example of a conventional built-in antenna structure will be described with reference to FIG. 1.

1 is a planar inverted F antenna (PIFA) antenna using a conventional open stub. As shown in FIG. 1, the PIFA antenna using a conventional open stub is formed such that the feeding pin 20 and the shorting pin 30, which are electrically connected to the ground plane 40, respectively, protrude to a predetermined length, and are horizontal. And rectangular open stub radiators 10 each having lengths L1 and L2, respectively.

However, the conventional technique is often used in a structure in which a metallic material, which is an antenna radiator, and a plastic carrier that mechanically supports it are formed. In this case, since the plastic carrier material having a low relative dielectric constant (about 3) is generally used, there is a limit in reducing the antenna size by only the radiator of the antenna because the influence on the resonance frequency of the antenna is small.

In addition, a method of using a dielectric in a manner of obtaining parasitic resonance characteristics in a high frequency band by placing a dielectric having a high relative dielectric constant near the feed point of the antenna has been proposed. In addition, there is a limit to the reduction, and when the dielectric is used only in a specific part, the antenna's input impedance is changed drastically by changing only the electromagnetic field of the E-field and the H-field, so that the conventional antenna has a low frequency and a high frequency. There is a problem that it is difficult to implement a wideband characteristic at the same time across the band.

Accordingly, the present invention is to solve the above problems, it is possible to meet the characteristics of the broadband and multi-band while reducing the size of the antenna while maintaining the existing antenna bandwidth as it is built in the antenna in the mobile communication terminal It is an object to provide an antenna.

In order to achieve the above object, a small broadband internal antenna using a material in which a high dielectric material and a high magnetic material are combined according to an embodiment of the present invention is a ground plane for grounding a signal made of a conductor in an internal antenna mounted in a mobile communication terminal. And a feeding part composed of a non-conducting FR-4 dielectric and a conductive feeding pad on one side of the ground plane, and a shorting pin electrically connected to the ground plane and protruding to a predetermined length, and a feeding pad of the feeding part at a constant length. Feed pins protrudingly connected to feed signals from the outside, and a single meander line formed on the feed pins and the short-circuit pins to radiate in 5-band, for the first high frequency, the second high frequency, and the second high frequency. It is characterized by consisting of a high frequency open type stub radiator.

According to an embodiment of the present invention, the low frequency, the first high frequency, the second high frequency, and the third high frequency open stub radiator further comprises a plastic carrier further comprises.

According to an embodiment of the present invention, a dielectric having a dielectric constant of any one of 6 to 40 with respect to the entire area of the antenna area under the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators. It further comprises.

According to an embodiment of the present invention, the lower permeability of the dielectric is characterized in that it further comprises a magnetic material of any one of 6 ~ 100.

According to one embodiment of the present invention further comprises a magnetic material having a specific permeability of 6 to 100 at the lower portion of the low frequency, the first high frequency, the second high frequency and the third high frequency open stub radiator, the lower magnetic body Is characterized in that it further comprises a dielectric having a dielectric constant of any one of 6 to 40.

According to an embodiment of the present invention, a dielectric having a dielectric constant of any one of 6 to 40 and a relative permeability of 6 to 40 under a low frequency, first high frequency, second high frequency, and third high frequency open stub radiator. Any one of the magnetic material is characterized in that it further comprises a mixed material.

According to an embodiment of the present invention, the plastic carrier further includes a dielectric having any one of 6 to 40 relative dielectric constants.

According to an embodiment of the present invention, the lower permeability of the dielectric is characterized in that it further comprises a magnetic material of any one of 6 ~ 100.

According to an embodiment of the present invention, the plastic carrier further includes a magnetic material having any one of 6 to 100 specific permeability, and further comprising a dielectric having a relative dielectric constant of any one of 6 to 40 in the lower portion of the magnetic carrier. It is done.

According to an embodiment of the present invention, the plastic carrier further includes a material having a dielectric constant of any one of 6 to 40 and a magnetic material having any one of 6 to 100.

=

) 것을 특징으로 한다.According to one embodiment of the present invention, the values of relative permittivity and relative permeability of the material in which the dielectric and magnetic material are mixed are the same (

=

It is characterized by.

The present invention is a built-in antenna mounted in the mobile communication terminal is made of a ground plane for grounding the signal, and a feed portion consisting of a non-conductor FR-4 dielectric and a feed pad is a conductor on one side of the ground plane and the ground plane and Electrically connected short-circuit pins protruding to a constant length and a feeding pad protruding to a predetermined length to the feeding pad of the feed part to form a feed pin for feeding a signal from the outside and a single me-and-line on the feed pins and the short-circuit pins Small wideband internal antenna using a material combined with a high dielectric material and a high magnetic material, characterized in that it consists of an open stub radiator for low frequency, first high frequency, second high frequency, and third high frequency radiating in a 5-band To present.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. Hereinafter, the antenna described in the present invention includes an antenna having a quarter wavelength as an example.

Figure 2a is a top side view of the built-in antenna mounted in the mobile communication terminal according to the present invention, Figure 2b is a bottom side view of the built-in antenna mounted in the mobile communication terminal according to the present invention. As shown in Figure 2a and Figure 2b, in the built-in antenna mounted in the mobile communication terminal is made of a conductor grounding signal 100 and a non-conductor FR-4 dielectric on one side of the ground plane 100 And a feeder 210 consisting of a conductive pad feeder 220 and a shorting pin 300 electrically connected to the ground plane 100 and protruding to a predetermined length, and a feeder pad 220 of the feeder 210. Connected to protrude to a predetermined length in the feed pin 200 for feeding a signal from the outside and the feed pin 200 and the short pin 300 formed on a single meander line formed in a five band (GSM850, GSM900, Low frequency, first high frequency, second high frequency, and third high frequency open stub radiators 400, 500, 600, and 700 that radiate in the frequency bands of DCS, PCS, and WCDMA.

The low frequency, first high frequency, second high frequency, and third high frequency open stub radiators 400, 500, 600, and 700 are radiated in five bands. The five bands include Global System for Mobile communication 850 (GSM850), Global System for Mobile communication 900 (GSM900), Defense Communication System (DCS), Global for Personal Communications by Satellite (PCS), and Wide band Code Division Multiple Access (WCDMA). Say). The frequency bands of the GSM850, GSM900, DCS, PCS, and WCDMA are 824 MHz to 894 MHz, 880 MHz to 960 MHz, 1710 MHz to 1880 MHz, 1850 MHz to 1990 MHz, and 1920 MHz to 2170 MHz, respectively.

The plastic carrier 800 may be further included below the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators 400, 500, 600, and 700.

FIG. 3 is a graph illustrating a return loss measurement result of the antenna of FIGS. 2A and 2B. As shown in FIG. 3, the return losses corresponding to frequencies having 824 MHz, 960 MHz, 1710 MHz, 1850 dB, 1880 MHz, 1990 MHz, and 2170 MHz are -6.7 dB, -6.7 dB, -8.1 dB, and -10.3 dB, respectively. , -10.7dB, -10.3dB and -13.4dB.

Looking at the measurement results, when the size of the antenna is 5.6CC, it can be confirmed that the bandwidth of the five bands at the same time.

4 is a bottom side view illustrating a state in which a dielectric having a relative dielectric constant in a range of 6 to 40 is inserted into a lower portion of the antenna of FIGS. 2A and 2B. As shown in FIG. 4, a feed plane 210 including a ground plane 100 for grounding a signal, a FR-4 dielectric that is a non-conductor, and a feed pad that is a conductor on one side of the ground plane 100, and the ground plane. A short circuit pin 300 is electrically connected to the 100 and protrudes to a predetermined length, and a feed pin 200 is connected to the feed section 210 so as to protrude to a certain length to feed a signal from the outside. Open stub emitters 400, 500, 600, 700, hereinafter 700 for low frequency, first high frequency, second high frequency and third high frequency on the same plane above the pin 200 and the shorting pin 300 are not visible. 2a) are arranged and connected to each other. The low frequency, first high frequency, second high frequency, and third high frequency open stub radiators 400, 500, 600, and 700 have a dielectric constant having a relative dielectric constant in the range of 6-40. Is done.

The resonance frequency of the antenna is determined as in Equation 1 below.

(Equation 1)

=파장(m),

=자유공간파장(m),

=비유전율,

=비투자율, f=공진주파수이다. here,

= Wavelength (m),

= Free space wavelength (m),

= Relative dielectric constant,

= Specific permeability, f = resonant frequency.

Therefore, the higher the relative dielectric constant and relative permeability, the lower the resonance frequency of the antenna and the smaller the antenna size.

In addition, the wavelength impedance of the antenna is determined as in Equation 2.

(Equation 2)

=파동임피던스(Ω),

=투자율, =유전율이다. here,

= Wave impedance (Ω),

= Permeability, = dielectric constant.

과

이 1이고 따라서

는 377Ω이 된다. 그러나

>>

또는

>>

인 경우에는 안테나의 파장 임피던스는 0 또는 무한대의 값을 가지므로 50Ω에 매칭하기 쉽지 않다. 따라서,

=

인 값을 가질 때 입력 임피던스가 공기중의 377Ω값과 매칭이 이루어져 안테나의 좋은 방사 효율 특성을 가질 수 있다. Generally in the air

and

Is 1 and therefore

Becomes 377Ω. But

>>

or

>>

In the case of, the wavelength impedance of the antenna has a value of 0 or infinity, so it is not easy to match 50Ω. therefore,

=

When it has the value of, the input impedance is matched with the value of 377Ω in the air, which can have good radiation efficiency characteristics of the antenna.

5 is a graph illustrating a return loss measurement result of the antenna of FIG. 4. As shown in FIG. 5, the return losses corresponding to frequencies having 824 MHz, 960 MHz, 1710 MHz, 1880 MHz, 1990 MHz, and 2170 MHz are -6.6 dB, -9.3 dB, -6.2 dB, -7.0 dB, and-, respectively. 8.9dB and -12.0dB.

Looking at the measurement results, when the size of the antenna is 4.6CC, it can be confirmed that the bandwidth of the five bands at the same time.

6 is a bottom side view illustrating a state in which a dielectric having a relative dielectric constant in a range of 6 to 40 and a magnetic material having a relative permeability in a range of 6 to 100 are inserted into a lower portion of the antenna of FIGS. 2A and 2B. As shown in FIG. 6, a feeder 210 comprising a ground plane 100 for grounding a signal, a non-conductor FR-4 dielectric, and a feed pad that is a conductor on one side of the ground plane 100 and the ground plane A shorting pin 300 electrically connected to the 100 and protruding to a predetermined length and a feeding pin 200 protrudingly connected to the entire feed 210 to a predetermined length to feed a signal from the outside are formed. Low frequency, first high frequency, second high frequency and third high frequency open stub radiators 400, 500, 600, and 700 are disposed on the same plane above the pin 200 and the shorting pin 300, respectively. It is connected. In addition, a dielectric 900 having a relative dielectric constant in the range of 6 to 40 is formed below the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators 400, 500, 600, and 700. The magnetic body 1000 having a specific permeability in the range of 6 to 100 is formed under the dielectric.

7 is a graph illustrating a return loss measurement result of the antenna of FIG. 6. As shown in FIG. 7, return losses corresponding to frequencies having 824 MHz, 960 MHz, 1710 MHz, 1880 MHz, 1990 MHz, and 2170 MHz are -6.6 dB, -9.3 dB, -8.2 dB, -10.0 dB, -10.1 dB, and-respectively. 6.0 dB.

Looking at the measurement result, when the size of the antenna is 3.9CC, it can be confirmed that the bandwidth of the five bands at the same time.

FIG. 8 is a bottom side view illustrating a state in which a material in which a dielectric material having a relative dielectric constant in the range of 6 to 40 and a magnetic material having a relative permeability in the range of 6 to 100 is inserted into the lower part of the antenna of FIGS. 2A and 2B. As shown in FIG. 8, a feeder 210 including a ground plane 100 for grounding a signal, a non-conductive FR-4 dielectric, and a feed pad that is a conductor on one side of the ground plane 100 and the ground plane. A short circuit pin 300 is electrically connected to the 100 and protrudes to a predetermined length, and a feed pin 200 is connected to the feed section 210 so as to protrude to a certain length to feed a signal from the outside. Low frequency, first high frequency, second high frequency and third high frequency open stub radiators 400, 500, 600, and 700 are disposed on the same plane of the pin 200 and the shorting pin 300, respectively. Are connected to each other. In addition, a dielectric 800 having a relative dielectric constant in the range of 6 to 40 is formed below the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators 400, 500, 600, and 700. And a dielectric material having a relative dielectric constant in the range of 6 to 40 under the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators 400, 500, 600, and 700. A material 1100 having a magnetic permeability having a specific permeability in the range of 100 is formed, and the material 1100 having the dielectric material and the magnetic material mixed is most preferably mixed at a ratio of 50:50.

9 is a graph illustrating a return loss measurement result of the antenna of FIG. 8. As shown in FIG. 9, the return losses corresponding to frequencies having 824 MHz, 960 MHz, 1710 MHz, 1880 MHz, 1990 MHz, and 2170 MHz are -6.6 dB, -8.8 dB, -8.2 dB, -10.0 dB, -8.9 dB and-, respectively. 6.0 dB.

Looking at the measurement results, when the size of the antenna is reduced to 3.8CC in general, the bandwidth of the antenna is significantly reduced, but when using the above structure, as shown in Figure 9, it is confirmed that to satisfy the bandwidth of the five bands at the same time Can be.

The present invention has been described in detail so far, but the embodiments mentioned in the process are only illustrative and are not intended to be limiting, and the present invention is provided by the following claims and the technical spirit and field of the present invention. Within the scope not departing from the scope of the present invention, changes in the components that can be coped evenly will fall within the scope of the present invention.

The small broadband internal antenna of the present invention has the effect of satisfying the characteristics of broadband and multi-band while maintaining the existing antenna bandwidth while reducing the antenna size when the antenna is embedded in the mobile communication terminal. It can also be used as an antenna solution such as the Ultra High Frequency (UHF) band such as the emerging Digital Video Broadcasting-Handheld (DVB-H) or Terrestrial Digital Multimedia Broadcasting (T-DMB) built-in antenna.

Claims (11)

delete delete delete In the built-in antenna mounted in the mobile communication terminal, A ground plane consisting of a conductor to ground the signal; A feeding part composed of a non-conducting FR-4 dielectric and a conductive feeding pad on one side of the ground plane; A shorting pin electrically connected to the ground plane and protruding to a predetermined length; A feeding pin connected to the feeding pad of the feeding part so as to protrude to a predetermined length to feed a signal from the outside; An open stub emitter for low frequency, first high frequency, second high frequency, and third high frequency, formed of a single meander line on the feed pin and the short pin; A dielectric having a relative dielectric constant of 6 to 40 with respect to the entire area of the antenna area under the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators; And A magnetic material having a specific permeability of 6 to 100 under the dielectric; Small broadband internal antenna using a material combined with a high dielectric and high magnetic material, characterized in that consisting of. In the built-in antenna mounted in the mobile communication terminal, A ground plane consisting of a conductor to ground the signal; A feeding part composed of a non-conducting FR-4 dielectric and a conductive feeding pad on one side of the ground plane; A shorting pin electrically connected to the ground plane and protruding to a predetermined length; A feeding pin connected to the feeding pad of the feeding part so as to protrude to a predetermined length to feed a signal from the outside; An open stub emitter for low frequency, first high frequency, second high frequency, and third high frequency, formed of a single meander line on the feed pin and the short pin; A magnetic material having a specific permeability of 6 to 100 below the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators; And A dielectric having a relative dielectric constant of any one of 6 to 40 below the magnetic body; Small broadband internal antenna using a material combined with a high dielectric and high magnetic material, characterized in that consisting of. In the built-in antenna mounted in the mobile communication terminal, A ground plane consisting of a conductor to ground the signal; A feeding part composed of a non-conducting FR-4 dielectric and a conductive feeding pad on one side of the ground plane; A shorting pin electrically connected to the ground plane and protruding to a predetermined length; A feeding pin connected to the feeding pad of the feeding part so as to protrude to a predetermined length to feed a signal from the outside; An open stub emitter for low frequency, first high frequency, second high frequency, and third high frequency, formed of a single meander line on the feed pin and the short pin; A material having a dielectric constant of any one of 6 to 40 and a magnetic material having a specific permeability of 6 to 100 under the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators. ; Small broadband internal antenna using a material combined with a high dielectric and high magnetic material, characterized in that consisting of. delete In the built-in antenna mounted in the mobile communication terminal, A ground plane consisting of a conductor to ground the signal; A feeding part composed of a non-conducting FR-4 dielectric and a conductive feeding pad on one side of the ground plane; A shorting pin electrically connected to the ground plane and protruding to a predetermined length; A feeding pin connected to the feeding pad of the feeding part so as to protrude to a predetermined length to feed a signal from the outside; An open stub emitter for low frequency, first high frequency, second high frequency and third high frequency which is formed of a single meander line on the feed pin and the short pin and radiates in a five band; A plastic carrier under the low frequency, first high frequency, second high frequency and third high frequency open stub radiators; A dielectric having a relative dielectric constant of 6 to 40 below the plastic carrier; And A magnetic material having a specific permeability of 6 to 100 under the dielectric; Small broadband internal antenna using a material combined with a high dielectric and high magnetic material, characterized in that consisting of. In the built-in antenna mounted in the mobile communication terminal, A ground plane consisting of a conductor to ground the signal; A feeding part composed of a non-conducting FR-4 dielectric and a conductive feeding pad on one side of the ground plane; A shorting pin electrically connected to the ground plane and protruding to a predetermined length; A feeding pin connected to the feeding pad of the feeding part so as to protrude to a predetermined length to feed a signal from the outside; An open stub emitter for low frequency, first high frequency, second high frequency, and third high frequency, formed of a single meander line on the feed pin and the short pin; A plastic carrier under the low frequency, first high frequency, second high frequency and third high frequency open stub radiators; A magnetic material having a specific permeability of 6 to 100 under the plastic carrier; And A dielectric having a relative dielectric constant of any one of 6 to 40 below the magnetic body; Small broadband internal antenna using a material combined with a high dielectric and high magnetic material, characterized in that consisting of. In the built-in antenna mounted in the mobile communication terminal, A ground plane consisting of a conductor to ground the signal; A feeding part composed of a non-conducting FR-4 dielectric and a conductive feeding pad on one side of the ground plane; A shorting pin electrically connected to the ground plane and protruding to a predetermined length; A feeding pin connected to the feeding pad of the feeding part so as to protrude to a predetermined length to feed a signal from the outside; An open stub emitter for low frequency, first high frequency, second high frequency, and third high frequency, formed of a single meander line on the feed pin and the short pin; A plastic carrier under the low frequency, first high frequency, second high frequency, and third high frequency open stub radiators; And A material having a dielectric constant of any one of 6 to 40 and a magnetic material of any one of 6 to 100 having a relative permeability mixed thereon under the plastic carrier; Small broadband internal antenna using a material combined with a high dielectric and high magnetic material, characterized in that consisting of. The method of claim 6 or 10, The dielectric constant and relative permeability of the material in which the dielectric and magnetic material are mixed are the same (

=

Small wideband internal antenna using a material combined with a high dielectric material and a high magnetic material.

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