KR20060097415A - An internal antenna using a coupling effect in a mobile communication terminal supporting a multi-band - Google Patents

Abstract

The present invention relates to a built-in antenna using a coupling in a mobile communication terminal supporting multi-band.

The present invention includes a radiation patch for radiating a radio frequency signal of two or more different frequency bands including a dielectric and a conductive pattern, a power supply pin for feeding high frequency power to the radiation patch, and a terminal substrate. A mobile communication terminal supporting a multi-band having a built-in antenna made of a short pin connected to a ground of a printed circuit board (PCB) to ground the radiation patch. Coupling the flow of current output from the RF circuit terminal inside the corresponding terminal in the low frequency band through the power supply pin and into the radiation patch, and flows into the radiation patch in the high frequency band and short-circuit pin through the terminal board. It is configured with a built-in antenna including a coupling pattern for coupling the flow of current flowing into the ground terminal of the.

Accordingly, the present invention provides a frequency band such as a global systems for mobile communication (GSM) service, a digital cordless system (DCS) service, a personal communication service (PCS) service, a code division multiple access (CDMA) 2000, and a wideband CDMA (WCDMA) service. Among the other service methods, a low frequency band (880 to 960 MHz) such as a GSM service in a built-in antenna of a PIFA (Planar Inverted F Antenna) type of a mobile communication terminal supporting multi-bands capable of providing two or more services. Couples the current flowed from the RF circuit terminal inside the terminal to the feed pin and couples it to the radiating patch, and enters the radiating patch in the high band (1.71 to 2.17 GHz) such as DCS service and short circuit pin. By coupling the current flow out to the ground terminal of the terminal board through the circuit, the current flow in the antenna is concentrated at a specific point. By increasing the bandwidth in the low and high bands without being affected by the arrangement of each device, circuit, or component, it also reduces the working time in designing the antenna, as well as standing voltage ratio (VSWR) and radiation. It has the effect of improving the characteristics.

Description

Built-in antenna using coupling in mobile communication terminal supporting multi-band {AN INTERNAL ANTENNA USING A COUPLING EFFECT IN A MOBILE COMMUNICATION TERMINAL SUPPORTING A MULTI-BAND}

1 is a block diagram showing a structure of a built-in antenna using a coupling in a mobile communication terminal supporting the present invention multi-band.

2 is a graph showing the radiation efficiency of the built-in antenna according to the distance between the coupling pattern and the ground terminal of the terminal substrate in the present invention.

Figure 3 is a graph showing the radiation efficiency of the built-in antenna according to the distance between the feed pin and the coupling pattern in the present invention.

4A and 4B are graphs showing network data of antenna patterns measured by a network analyzer with and without a coupling pattern at low bands (880 to 960 MHz).

5A and 5B are graphs showing network data of antenna patterns measured by a network analyzer with or without coupling patterns in the low band (880 to 960 MHz) and the high band DCS (1.71 to 1.88 GHz).

*** Description of the symbols for the main parts of the drawings ***

10: radiation patch 11: feed pin

12: short pin 13: coupling pattern

14: ground terminal of the terminal board

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal supporting multi-bands. In particular, in a built-in antenna in the form of a Planar Inverted F Antenna (PIFA) of a mobile communication terminal supporting multi-bands, the position of the coupling pattern is adjusted. By preventing and distributing the flow of current in the antenna at a specific point, it increases bandwidth in the low and high bands without affecting the placement of each instrument, circuit, or component, and increases the standing wave ratio (VSWR, Voltage Standing). The present invention relates to a built-in antenna using coupling in a mobile communication terminal supporting multi-band for improving wave ratio) and radiation characteristics.

Intenna refers to a built-in antenna, unlike an antenna that is mounted on the outside of a wireless device, it refers to a device that is mounted inside the wireless device to reduce the overall volume of the wireless device and slim down the appearance. The mobile communication terminal is mainly equipped with an antenna in the form of a Planar Inverted F Antenna (PIFA).

Recently, a single mobile communication terminal uses a Global Systems for Mobile communication (GSM) service in the 880 to 960 MHz band, a digital cordless system (DCS) service in the 1.71 to 1.88 GHz band, and a Personal Communication Service in the 1.85 to 1.99 GHz band. ) Provides a mobile communication service by selecting a service method having one frequency band among different frequency bands such as a service, a code division multiple access (CDMA) 2000 in the 2.11 to 2.17 GHz band, and a wideband CDMA (WCDMA) service. Since multi-band mobile communication terminals are commercially available, PIFA type antennas may be installed as a built-in antenna in a mobile communication terminal supporting the multi-band as described above.

In this case, in general, the PIFA type antenna has a short-circuit connected to a feeding pin connected to an RF (Radio Frequency) circuit terminal and a ground terminal of a printed circuit board (PCB) in order to have a wide bandwidth. A characteristic is implemented by using a short pin, and mainly made of a dielectric to adjust the height, width and length of the patch of the antenna connected to the feeding pin and the shorting pin, or to adjust the positions of the feeding pin and the shorting pin. The bandwidth, gain, and resonant frequency of the antenna are determined accordingly. Therefore, when designing an antenna for realizing a multi-band, the antenna having an optimal radiation efficiency in each frequency band is generally considered in consideration of the interference or arrangement between devices. By being implemented, there was a problem that the work for this is complicated and takes a lot of time.

Therefore, the present invention has been proposed to solve the above-described problems, and in the integrated antenna of the PIFA (Planar Inverted F Antenna) type of a mobile communication terminal supporting multi-bands, Position adjustment prevents and distributes the flow of current in the antenna at a specific point, increasing bandwidth in the low and high bands without affecting the placement of each instrument, circuit, or component, and working in antenna design It is an object of the present invention to provide a built-in antenna to shorten the time.

The present invention for achieving the above object, including a dielectric and a conductive pattern, a radiation patch for radiating a radio frequency signal (Radio Frequency Signal) of two or more different frequency bands, for feeding the high frequency power with the radiation patch (Feeding) Multi-Band has a built-in antenna made up of a feed pin, a ground pin connected to a ground of a printed circuit board (PCB) and a short pin to ground the radiation patch. In the supporting mobile communication terminal, the current flows from the RF circuit terminal inside the terminal in the low frequency band and couples the flow of current flowing into the radiation patch through the feed pin and flows into the radiation patch in the high frequency band. And a coupling pattern coupling the flow of current flowing out to the ground terminal of the terminal board through the short-circuit pin.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a structure of a built-in antenna using a coupling in a mobile communication terminal supporting multi-band according to the present invention. As shown in FIG. A radiation patch 10 for radiating a radio frequency signal, a feed pin 11 for feeding high frequency power to the radiation patch 10, and a printed circuit board (PCB) In a mobile communication terminal supporting a multi-band by having a built-in antenna consisting of a short pin (12) connected to a ground (14) to ground the radiation patch 10 Coupling the flow of current flowing from the RF circuit terminal (not shown) inside the terminal in the low frequency band and flowing into the radiation patch 10 through the feed pin 11 and radiating the radiation in a high frequency band With patch (10) Is constitutes a coupling pattern (13) for coupling the flow of current flowing into the ground terminal 14 of the terminal board via the shorting pin 12.

The present invention is a Global Systems for Mobile communication (GSM) service in the 880-960 MHz band, Digital Cordless System (DCS) service in the 1.71-1.88 GHz band, Personal Communication Service (PCS) service in the 1.85-1.99 GHz band, and 2.11-2.17 GHz. It supports two or more service methods of different frequency bands, such as code division multiple access (CDMA) 2000 or wideband CDMA (WCDMA) services, and selects a service method having any one frequency band according to the system environment. The present invention can be applied to a mobile communication terminal supporting a multi-band capable of receiving a mobile communication service.

In particular, when using a built-in antenna in the form of a Planar Inverted F Antenna (PIFA) to implement a mobile communication terminal supporting multi-band, RF circuitry inside the terminal in a low band (880 ~ 960MHz), such as GSM service ( The current flows from the output pins to the feed pins by coupling them into the radiation patch, and flows into the feed pins at high bands (1.71 to 2.17 GHz) such as DCS service, PCS service, and CDMA 2000 or WCDMA. By coupling a portion of the current flow that loops through the short-circuit pins to the terminal board, it prevents and distributes the flow of current in the antenna at a specific point, reducing the effect of each instrument, circuit or component placement without affecting Increasing the bandwidth in the high band and high band to shorten the working time of the antenna design, as well as the standing voltage ratio (VSWR) and radiation characteristics. Which can improve the antenna is able to design.

In the present invention, a built-in antenna having a PIFA shape, as shown in Figure 1, consisting of a radiation patch 10, a feed pin 11, a short pin 12, the coupling pattern 13, the ground end of the terminal substrate 14 is connected.

The radiation patch 10 is formed of a dielectric such as a ceramic using a material such as ceramic and a conductive material (nickel) on the surface of the dielectric to operate in the low band (880 to 960 MHz) and the high band (1.71 to 2.17 GHz). And a conductive pattern formed of a plating material such as gold), wherein the feed pin 11, the shorting pin 12, and the coupling pattern 13 are disposed at a predetermined position of the conductive pattern of the radiation patch 10. It has a structure that is connected, the conductive pattern is resonant in the low frequency band and high frequency band.

The radiation patch 10 receives high frequency power from a radio frequency (RF) circuit terminal (not shown) inside the corresponding mobile communication terminal through a feed pin 11 and is connected to the ground terminal 14 of the terminal substrate. The short circuit is shorted by the short pin 12 to achieve impedance matching, and the coupling pattern 13 couples the flow of current transmitted from the RF circuit terminal through the feed pin 11 or the feed pin 11. And couples a portion of the current flow looped through the shorting pin 12 to the terminal substrate.

Here, the coupling pattern 13 is connected to the feed pin 11 to the RF circuit terminal (not shown) inside the terminal and the shorting pin 12 to the ground terminal 14 of the terminal substrate. The conductive material is silver conductive material, which is spaced apart from the ground terminal 14 of the terminal substrate at a predetermined interval h, and is also spaced apart from the feed pin 11 at a predetermined interval w. By connecting to the patch 10, by coupling the flow of current generated from the built-in antenna to improve the characteristics of the antenna. In addition, one or more coupling patterns 13 may be connected to the radiation patch 10 to improve antenna characteristics.

In general, the high frequency power output from the RF circuit terminal (not shown) inside the mobile communication terminal supporting multi-band in the embedded antenna is concentrated on the feed pin 11 is radiated through the conductive pattern of the radiation patch 10, again The short-circuit pin 12 forms a loop in such a manner that the current flow by the high frequency power is grounded at the ground end 14 of the terminal substrate.

In this case, in case of receiving a service using a high band (1.71 to 2.17 GHz) frequency such as DCS service, PCS service and CDMA 2000 or WCDMA through a built-in antenna in a mobile communication terminal supporting multi-band, a coupling pattern ( 13) and a portion of the current flow introduced into the feed pin 11 and looped to the terminal board through the short-circuit pin 12 by adjusting the distance h between the ground terminal 14 of the terminal board. The ground terminal 14 of the terminal substrate is coupled by the coupling pattern 13 spaced apart by a predetermined distance h without being connected to the ground terminal 14 of the terminal substrate. ) By a predetermined amount.

As a result of the flow of the coupled current, the distance h between the coupling pattern 13 and the ground terminal 14 of the terminal substrate is 0.1 mm, 0.3 mm, and 0.5 mm, as shown in FIG. 2. With each change to, the radiation efficiency (S _1,1 ) of the built-in antenna changes in inverse proportion to the bandwidth, especially when it becomes '0.5mm' to secure stable bandwidth and proper radiation efficiency in the high band.

Meanwhile, when a service using a low band (880 to 960 MHz) frequency such as a GSM service is provided using a mobile communication terminal supporting multi-band, it is output from an internal RF circuitry (not shown) to feed a power supply pin ( Part of the flow of current concentrated at 11 is coupled to the conductive pattern of the radiation patch 10 through the coupling pattern 13 spaced apart from the feed pin 11 by a predetermined interval w, The current flow of high frequency power is distributed through various paths instead of being concentrated in specific parts, thereby improving the frequency characteristics in the low band.

That is, as shown in the graph of FIG. 3, the radiation efficiency of the built-in antenna is changed as the distance w between the feed pin 11 and the coupling pattern 13 is changed to 0.3 mm to 11 mm due to the flow of the coupled flowing current. It can be seen that (S _1,1 ) and the bandwidth is inversely proportional. In this case, the interval (w) may be adjusted by selecting an appropriate radiation efficiency value and bandwidth according to the wireless environment and the characteristics of the terminal.

4 and 5 are graphs measured by a network analyzer (NA), in which FIG. 4A shows a state in which there is no coupling pattern 13 for only a low band (880 to 960 MHz). Network data of the antenna pattern, b of Figure 4 is the network data of the antenna pattern with the coupling pattern 13 in accordance with the present invention, bandwidth shown when using the coupling pattern 13 as shown This broadening can be seen.

5A shows a state in which there is no coupling pattern 13 for a low band (880 to 960MHz) and a high band DCS (1.71 to 1.88GHz), and FIG. 5B shows a state in which a coupling pattern 13 exists. The network data of the antenna pattern at is shown in this case, and also in this case, it can be seen that the bandwidth becomes wider in both the low band and the high band. In this case, the bandwidth that does not satisfy the DCS band properly without the coupling pattern 13 is obtained. It can be seen that not only the DCS band but also the PCS band (1.85 to 1.99 GHz), the CDMA 2000 or the WCDMA band (2.11 to 2.17 GHz) are satisfied.

Therefore, when the present invention is applied, it is possible to effectively increase the bandwidth without being affected by mechanical, circuit, or component arrangement in the structure of the built-in antenna.

As described above, the present invention relates to a global systems for mobile communication (GSM) service, a digital cordless system (DCS) service, a personal communication service (PCS) service, a code division multiple access (CDMA) 2000, and a wideband CDMA (WCDMA) service. In the internal antenna of the PIFA (Planar Inverted F Antenna) type of a mobile communication terminal that supports multi-bands that can provide two or more services among different service schemes having different frequency bands, 880 to 960MHz) from the RF circuitry inside the terminal to couple the flow of current flowing into the feed pin to the radiation patch, and to the radiation patch in the high band (1.71 ~ 2.17GHz), such as DCS services By coupling the current flow flowing in and out to the ground terminal of the terminal board through the shorting pin, the current flow in the antenna By preventing and distributing the concentration, it increases the bandwidth in the low band and the high band without being affected by the arrangement of each device, circuit, or component, which shortens the working time in designing the antenna, as well as the voltage standing wave (VSWR). It has the effect of improving the ratio and radiation characteristics.

Claims (3)

Radiation patch including a dielectric and a conductive pattern and radiating a radio frequency signal of two or more different frequency bands, Feed pins for feeding high frequency power with the radiation patch, Terminal board (PCB) A mobile communication terminal supporting a multi-band having a built-in antenna consisting of a short pin connected to a ground of a printed circuit board and grounding the radiation patch, wherein the mobile communication terminal supports a multi-band. Coupling the flow of current output from the RF circuit terminal inside the terminal and flowing into the radiation patch through the feed pin, and enters the radiation patch in a high frequency band and is connected to the ground terminal of the terminal substrate through a short circuit pin. A mobile communication terminal supporting a multi band, characterized in that it comprises a coupling pattern for coupling the flow of current flowing out to the Built-in antenna with coupling at the end. The built-in antenna of claim 1, wherein the coupling pattern is made of a conductive material, and one side of the coupling pattern is connected to a radiation patch. The antenna of claim 1, wherein the coupling pattern is positioned at a spaced distance from the ground terminal and the power supply pin of the terminal board at predetermined intervals, respectively. .

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