KR100638608B1 - Broadband monopole antenna - Google Patents

Abstract

The present invention relates to a broadband built-in antenna which is formed inside a small terminal such as a portable terminal and can handle broadband.

According to an aspect of the present invention, there is provided a broadband monopole embedded antenna mounted on a PCB board configured in a portable terminal, comprising: a radiator having a substantially rectangular shape and having a slot formed in a length (L) direction on one side in a width (W) direction; And a feeding part extending from the lower end of the other side in the width (W) direction of the radiating part; It includes, characterized in that the ground is formed according to the structure of the PCB substrate on which the antenna is mounted.

Built-in Antenna, Mobile Communications, Broadband, UWB, Monopole, Slot

Description

Broadband monopole built-in antenna {BROADBAND MONOPOLE ANTENNA}

1 is a view showing a wideband monopole internal antenna according to an embodiment of the present invention.

2 is a view showing a form in which a broadband monopole internal antenna mounted on a portable terminal according to an embodiment of the present invention.

3 is a diagram illustrating frequency characteristics when an antenna without a slot is used.

4 is a view showing a frequency characteristic when using a slotted antenna according to an embodiment of the present invention.

5 illustrates a wideband monopole internal antenna according to another embodiment of the present invention.

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

10: broadband monopole internal antenna according to an embodiment of the present invention

11: radiator

12: feeder

13: slot

20: portable terminal

21: PCB Board

30: Monopole antenna without slot

31: High Frequency Characteristics of a Slotless Monopole Antenna

41: passband characteristics

51: stopband characteristics

52: opening

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna having a wideband characteristic, and more particularly, to a broadband internal antenna which is formed inside a small terminal such as a portable terminal and can handle wideband.

Due to the recent rapid development of wireless communication technology, the cordless concept has been applied to most electronic products. In addition, the current wireless communication issue is the development of a smooth communication channel capable of digesting various contents.

To meet these demands, ultra-wideband (UWB) technology using pulse communication is rapidly spreading using low power and very high speed transmission. In this telecommunications market, wideband antennas capable of handling wideband are attracting attention as the most important components.

International Publication No. WO 02/13313 (2002.02.14, 'Electrically Small Planer Apparatus and System therefor') is a monopole slot in which a large egg-shaped oval slot is formed in a flat conductor plate and a smaller elliptical conductor is inserted. A monopole slot antenna is disclosed. The antenna is gradually increased from the narrow width of the slot formed by moving the position of the small elliptical conductor plate, the power supply may use a CPW or coaxial cable. The characteristics of the antenna are broadband due to the gradually increasing width, and the radiation pattern has a main beam formed front and rear like a typical slot antenna. The size of the antenna is 27.2 * 18.3 mm including the radiating slot, which has typical characteristics of the disk monopole antenna, but has a disadvantage of being too large for a portable communication device.

In addition, U.S. Patent No. 6351246 (Planer UWB Antenna with Integrated Electronics) adds a resistor between two pairs of radiating elements to reduce the voltage standing-wave ratio (VSWR). Disclosed is an antenna having improved characteristics. The characteristic of the antenna lies in the use of differential signals in feeding. Although the antenna satisfies the technical element that satisfies the electric pulse communication electrically in a desired frequency band, it is difficult to miniaturize and thus there is a limitation in practical use. In addition, since the resistor is used to improve the voltage standing wave ratio in the low frequency band, it is difficult to maintain continuous reliability of the product.

In addition, US Patent No. 5428364 (Wide Band Dipole Radiation Element with a slot lime feed having a klopfenstein impedance taper) discloses a slot line feeding antenna for a broadband radar system. The antenna requires an impedance taper to have a broadband matching characteristic in order to transmit electromagnetic energy input from a source without loss, and can secure a characteristic of VSWR 2.0 or less in a band of 0.5-18 GHz. However, the antenna has a disadvantage in that the size of the matching circuit for wideband matching increases depending on the frequency band used as the slot type impedance taper is used.

An object of the present invention for solving the above problems is to provide an antenna capable of processing a broadband (UWB) in a very small size in a wireless terminal such as a portable terminal.

In addition, another object of the present invention is to provide a built-in antenna that can easily form a pass band or a stop band over a wide frequency band while being embedded in a wireless terminal using a broadband (UWB) technology.

In the present invention for achieving the above object, in the wideband monopole built-in antenna mounted on a PCB substrate configured in the portable terminal,
A radiator having a substantially rectangular shape and having a slot formed in a length (L) direction on one side in a width (W) direction; And a feeding part extending from the lower end of the other side in the width (W) direction of the radiating part; It includes, characterized in that the ground is formed according to the structure of the PCB substrate on which the antenna is mounted.

Here, the slot may be formed in a trapezoid with substantially parallel upper and lower surfaces.

Furthermore, it is preferable that the upper surface of the slot is shorter than the lower surface, and the seat surface is formed substantially perpendicular to the upper surface and the lower surface.

In addition, it is preferable that the width of the feed part is smaller than the width W of the radiating part.

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Furthermore, the antenna may be formed separately from the PCB substrate and then mounted on the PCB substrate, or may be integrally formed on the PCB substrate.

In addition, the broadband monopole built-in antenna according to the present invention for achieving the above object, characterized in that the slot has an opening extending to the outside of the radiating portion open.

In this case, the opening is preferably extended from the upper left of the trapezoidal slot is opened to the outside of the radiating portion.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that reference numerals and like elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a view showing a broadband monopole internal antenna according to an embodiment of the present invention.

Referring to FIG. 1, a broadband monopole internal antenna 10 according to an exemplary embodiment of the present invention includes a substantially rectangular radiating portion 11 having a slot 13 formed therein, and a portion of the radiating portion 11. It includes a feed portion 12 connected to the lower surface, a microstrip mono-pole (Microstrip mono-pole) antenna is formed in a structure.

The radiating part 11 is formed in a substantially rectangular shape in which the vertical length L is larger than the horizontal width W.

Here, the inside of the radiating part 11, a slot 13 is formed on one side in the width (W) direction of the radiating part 11, that is, the left side of the radiating part (11). The slot 13 is formed long in the length L direction of the radiating part 11. The slot 13 is preferably formed in a trapezoid with a substantially parallel upper and lower surfaces. At this time, as shown in Figure 1, the upper surface of the slot 13 is shorter than the lower surface, the left surface is preferably formed substantially perpendicular to the upper surface and the lower surface.

The feed part 12 extends from the other side in the width (W) direction of the radiating part 11, that is, the lower right side of the radiating part 11, thereby forming a monopole antenna. It is preferable that the width of the feed part 12 is smaller than the width W of the radiating part 11.

2 is a diagram illustrating a form in which a broadband monopole internal antenna is mounted in a portable terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the broadband monopole embedded antenna 10 according to the exemplary embodiment of the present invention is mounted on a PCB substrate 21 configured in the portable terminal 20. The PCB substrate 21 includes a transmission and reception circuit of the portable terminal 20, and supplies current to the power supply unit 12 so as to transmit and receive a signal of a desired band through the antenna 10. As such, the current supplied to the power supply unit 12 causes resonance at a constant frequency through the radiator 11, thereby processing a signal having a desired band. In this case, the portable terminal 20 and the PCB substrate 21 serve as a ground for the antenna 10 according to the structure thereof.

The antenna 10 according to the embodiment of the present invention may be manufactured separately from the PCB substrate 21 and then mounted on the PCB substrate 21. In addition, the antenna 10 may be manufactured integrally with the PCB substrate 21. In addition, the antenna 10 according to the embodiment of the present invention can be manufactured in a very small size and is easy to be applied to various communication apparatuses. Can be.

3 and 4 is a view showing a high frequency improvement characteristics according to the slot effect in the broadband monopole internal antenna according to an embodiment of the present invention.

First, FIG. 3 is a diagram illustrating frequency characteristics when an antenna having no slot is formed.

Referring to FIG. 3A, a monopole antenna 30 having no slot formed on the PCB board 21 is mounted.

3b shows the frequency characteristics of the monopole antenna 30 in which the slot is not formed. The horizontal axis of the graph of FIG. 3B represents frequency (GHz) and the vertical axis represents decibels (dB). Referring to FIG. 3B, it can be seen that the monopole antenna 30 in which the slot is not formed has no band characteristic at about 10 GHz.

4 is a diagram illustrating frequency characteristics when using a slotted antenna according to an embodiment of the present invention.

Referring to FIG. 4A, a monopole antenna 10 having a slot formed on a PCB board 21 is mounted. In FIG. 4A, the antenna 10 is mounted on the upper right side of the upper surface of the PCB board 21, but the mounting position thereof depends on the grounding condition of the PCB board 21 or the design freedom of the portable terminal 20 itself. can be changed.

4B shows the frequency characteristics of the slotted monopole antenna 10. The graph of FIG. 4B also shows the horizontal axis representing frequency (GHz) and the vertical axis representing decibels (dB). Referring to FIG. 4B, it can be seen that the slotted monopole antenna 10 is sharply showing a passband characteristic at about 10 GHz 41 compared with the graph of FIG. 3B. As described above, it can be seen that the broadband monopole embedded antenna 10 according to the embodiment of the present invention can easily improve the high frequency characteristics by appropriately forming the slot 13 in the substantially rectangular radiator 11. have.

5 is a diagram illustrating a wideband monopole internal antenna according to another embodiment of the present invention.

Referring to FIG. 5, the broadband monopole embedded antenna 50 according to another embodiment of the present invention has the same structure as that of the radiation unit 11 and the power supply unit 12 of FIG. 1. In this case, however, the slot 13 having a substantially trapezoidal structure extends to the outside of the radiating part 11 to have an opening 52 formed therein. The opening 52 is preferably extended from the upper left of the trapezoidal slot 13 is opened to the outside of the radiating portion (11).

6 is a view showing frequency characteristics when using an antenna having an open slot according to another embodiment of the present invention.

Referring to FIG. 6A, a monopole antenna 50 in which an open slot is formed on a PCB substrate 21 is mounted. In FIG. 6A, the antenna 50 is also mounted on the upper right side of the upper surface of the PCB substrate 21, but the mounting position may be changed.

6b shows the frequency characteristics of the open slotted monopole antenna 50. The graph of FIG. 6B also shows the horizontal axis representing frequency (GHz) and the vertical axis representing decibels (dB). Referring to FIG. 6B, compared to the graph of FIG. 3B, the monopole antenna 50 having the open slot has sharp stop band characteristics at about 51 GHz. As described above, the broadband monopole internal antenna 50 according to another embodiment of the present invention can be easily formed by forming a slot 13 having an opening 52 in the substantially rectangular radiator 11. It can be seen that it is possible to form a stopband at 3.1 ~ 10.6GHz).

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

According to the present invention as described above, when using a wireless terminal using a broadband (UWB) technology can be implemented in a very small internal antenna, there is an advantage that the size of the terminal can be miniaturized and the design freedom is improved.

In addition, according to the present invention, by changing the slot structure of the antenna in a wireless terminal using a broadband technology, it is possible to smoothly control the blocking characteristics within a wide frequency band, thereby advantageously controlling interference with other communication channels.

Claims (8)

In the broadband monopole built-in antenna mounted on a PCB board configured in the portable terminal, A radiator having a substantially rectangular shape and having a slot formed in a length (L) direction on one side in a width (W) direction; And A feeding part extending from the lower end of the other side in the width (W) direction of the radiating part; Including, Broadband monopole built-in antenna, characterized in that the ground is formed according to the structure of the PCB substrate on which the antenna is mounted. The broadband monopole internal antenna of claim 1, wherein the slot is formed in a trapezoid having substantially parallel top and bottom surfaces. The broadband monopole integrated antenna according to claim 1 or 2, wherein the upper surface of the slot is shorter than the lower surface, and the upper surface of the slot is substantially perpendicular to the upper surface and the lower surface. The wideband monopole built-in antenna according to claim 1, wherein an area of the feeding part is smaller than an area of the radiating part (W). delete The wideband monopole embedded antenna of claim 1, wherein the antenna is integrally formed on the PCB substrate. The wideband monopole built-in antenna according to claim 2, wherein the slot has an opening which extends and opens to the outside of the radiating part. 8. The wideband monopole embedded antenna according to claim 7, wherein the opening portion extends from an upper left side of the trapezoidal slot to open to the outside of the radiating portion.

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