KR100989325B1 - Cellphone imbedded ultra wide band compact antenna and cellphone imbedding the antenna - Google Patents

Abstract

PURPOSE: A UWB(Ultra Wide Band) small antenna and a terminal including the same are provided to improve the space efficiency of a terminal case by forming an antenna on the inner wall of the terminal case. CONSTITUTION: A feeding unit(110) has a rectangular shape. A first trapezoidal unit(120) is extended from the upper side of the feeding unit. A second trapezoidal unit(130) is extended from the upper side of the first trapezoidal unit. A first rectangular unit(140) is extended from the upper side of the second trapezoidal unit. A second rectangular unit(150) is extended from the upper side of the first rectangular unit. The feeding unit, the first trapezoidal unit, the second trapezoidal unit, the first rectangular unit, and the second rectangular unit are integrated.

Description

Ultra-wideband small antenna for terminal embedded and terminal embedded therein {Cellphone Imbedded Ultra Wide Band Compact Antenna and Cellphone Imbedding the Antenna}

The present invention relates to a small antenna which is embedded in a terminal and capable of wireless transmission and reception in an ultra wide band (UWB) of 3.1 to 10.6 GHz and in the form of a flexible circuit board.

Ultra Wide Band (UWB) is a technology developed by the US Department of Defense for military purposes. UWB uses ultra-wide bandwidth of several GHz bandwidth for wireless data transmission and has an ultra-fast transmission speed of 500 Mbps to 1 Gbps. In addition, despite the high transmission speed, power consumption is only one tenth of the power required by mobile phones and wireless LAN products. In particular, UWB technology features higher transmission speeds and lower power consumption compared to IEEE 802.11 and Bluetooth technologies.

This UWB technology is a high-precision wall vision radar that sees a local personal network or building wall that connects personal computers (PCs), peripherals, and consumer electronics with high-speed wireless interfaces in a local area (average 10 to 20 m, up to 100 m). It can be used in many fields such as location measurement, vehicle collision avoidance, landmine detection, anti-lost system, body detection.

On the other hand, small electronic devices such as mobile phones and PDAs are being developed to perform various functions in addition to basic functions such as phone calls and schedule management. For example, modern mobile phones can directly generate multimedia contents such as photos, music, videos, or the like, and can wirelessly transmit or play music. In addition, the mobile phone may not only transmit and receive data through a wireless telephone network, but also may transmit and receive data with other electronic devices in a short distance using IEEE 802.11 or Bluetooth technology. However, transmitting large amounts of multimedia content data using conventional IEEE 802.11 or Bluetooth technology is time consuming.

Therefore, there is a demand for using UWB technology in small electronic devices. This requires a small antenna operating in the UWB in the inner space of the narrow small electronic device.

Disclosure of Invention The present invention has been made to overcome the above-described problems, and an object thereof is to provide a UWB antenna and a terminal having a built-in UWB antenna for enabling UWB wireless data transmission in a small terminal such as a mobile phone. .

In order to achieve the above object, the present invention provides an ultra-wideband miniature antenna for embedding in a terminal, the rectangular feeder; A first trapezoidal portion extending from an upper portion of the feed portion and having an equilateral trapezoidal shape, the length of the lower side being longer than the horizontal length of the feeding portion, and the length of the upper side being longer than the length of the lower side; A second trapezoidal part extending from an upper part of the first ladder part and having an equilateral trapezoidal shape, the length of the lower side being equal to the length of the upper side of the first ladder part, and the length of the upper side being longer than the length of the lower side; A first rectangular portion extending from an upper portion of the second ladder portion, having a rectangular shape, and having a horizontal length equal to the length of an upper side of the second ladder portion; And a second rectangular portion extending from an upper portion of the first rectangular portion and having a rectangular shape, wherein the horizontal length is longer than the horizontal length of the first rectangular portion, the feeder portion, the first trapezoidal portion, the second trapezoidal portion, the first rectangular portion and The second rectangular portion provides an ultra wide band miniature antenna for internal terminal which is integrally formed.

The ultra-wideband miniature antenna for built-in terminals can be made of flexible conductors.

It is preferable that the angle between the non-parallel sides of a 1st trapezoid part is smaller than the angle between the non-parallel sides of a 2nd trapezoid part.

The present invention also provides a terminal incorporating the above-mentioned ultra-wideband small antenna in which at least a part of the above-mentioned ultra-wideband small antenna is installed on the surface of the substrate located inside the terminal.

The ultra wide band small antenna may be installed on the surface of the substrate, or the ultra wide band small antenna may be installed flexible and bent at the edge of the substrate, or the ultra wide band small antenna may be flexible and the part including the feed part may have the surface of the substrate. The other part may be installed on the inner wall of the outer case of the terminal.

The substrate may further include a ground portion installed on the surface, and the feed portion and the ground portion may form a coplanar waveguide (CPW) feed structure.

The UWB compact antenna according to the present invention described above exhibits broadband characteristics from 2.8 GHz to 8.5 GHz, and antenna gains in all bands have good results of 1.1 dBi to 2.1 dBi. The UWB small antenna is small enough to be installed inside a conventional terminal, and can be installed in a narrow space inside the terminal through various shapes. A terminal such as a cellular phone having a built-in UWB small antenna can transmit and receive large amounts of data at short distances with other electronic devices through UWB communication.

1 is a plan view of a UWB small antenna according to the present invention;
2 is a diagram illustrating a power supply structure of the UWB small antenna of FIG. 1;
3A to 3C are diagrams illustrating embodiments in which the UWB small antenna of FIG. 1 is installed in a terminal;
4A-4C show the results of a VSWR simulation from the UWB small antenna shown in FIGS. 3A-3C, respectively; and
5A to 5C are diagrams illustrating radiation patterns of H-plane, E1-plane, and E2-plane measured in the UWB small antenna shown in FIG. 3B, respectively.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 illustrates an ultra wide band (UWB) small antenna according to the present invention. Referring to FIG. 1, the UWB miniature antenna 100 according to the present invention includes a rectangular feeder 110, a first trapezoidal portion 120 and a first trapezoidal portion 120 positioned above the feeder 110. The second trapezoidal part 130 positioned at an upper portion, the first rectangular portion 140 positioned at an upper portion of the second trapezoidal portion 130, and the second rectangular portion 150 positioned at an upper portion of the first rectangular portion 140 are disposed. It includes, the feed unit 110, the first trapezoidal portion 120, the second trapezoidal portion 130, the first rectangular portion 140 and the second rectangular portion 150 are integrally formed. The UWB miniature antenna 100 is preferably made of a flexible flexible printed circuit board (FPCB). The thickness of the UWB miniature antenna 100 is preferably 0.17 mm, the horizontal length is 14.0 mm, and the vertical length is 18.5 mm.

The feed part 110 is formed in a rectangular shape. In one embodiment, the width of the feed unit 110 is 0.3 mm, the vertical length is 8 mm. An end of the power feeding unit 110 is electrically connected to an antenna receiving circuit (not shown).

FIG. 2 illustrates a power supply structure of the UWB miniature antenna 100 shown in FIG. 1. Referring to FIG. 2, the power feeding unit 110 of the UWB small antenna 100 is located on the surface of the circuit board 200 of the terminal. More specifically, at least a portion of the feed portion 110 including the end of the feed portion 110 is formed in the groove 210a formed on one side of the conductive ground portion 210 formed on the dielectric surface of the circuit board 200. The power supply unit 110 and the grounding unit 210 are spaced apart from each other. That is, the feed unit 110 and the ground unit 210 form a co-planar waveguide (CPW) feed structure. In FIG. 2, a configuration in which the end of the power supply unit 110 is connected to the antenna receiver circuit is omitted.

Referring back to FIG. 1, the first trapezoidal part 120 and the second trapezoidal part 130 are formed on the feed part 110. The first trapezoidal portion 120 is an equilateral trapezoidal shape, the length of the lower side is longer than the horizontal length of the feeder 110, the length of the upper side is longer than the length of the lower side. The second trapezoidal portion 130 is also an equilateral trapezoidal shape, the length of the lower side is equal to the length of the upper side of the first trapezoidal portion 120, the length of the upper side is longer than the length of the lower side. To facilitate current flow, the angle between the non-parallel stools of the first trapezoidal portion 120 is smaller than the angle between the non-parallel stools of the second trapezoidal portion 130. In FIG. 1, the angle of the hypotenuse of the first trapezoidal part 120 with respect to the horizontal line is 107 ° and the angle between the feces is 34 °, the angle of the hypotenuse of the second trapezoidal part 130 is 124 ° and the angle between the feces Is 68 °. In one embodiment, the length of the lower side of the first trapezoidal part 120 is 5.6 mm, the length of the upper side is 8.2 mm, the height is 4.1 mm, the length of the lower side of the second trapezoidal part 130 is 8.2 mm, and the length of the upper side is 10 mm, height is 1.4 mm.

The first rectangular part 140 and the second rectangular part 150 are formed on the second trapezoidal part 130. The horizontal length of the first rectangular portion 140 is equal to the length of the upper side of the second trapezoidal portion 130, and the horizontal length of the second rectangular portion 150 is longer than the horizontal length of the first rectangular portion 140, The first rectangular part 140 and the second rectangular part 150 form a step shape. The second rectangular part 150 is designed to secure the resonance frequency length value. In one embodiment, the horizontal length of the first rectangular portion 140 is 8.2 mm, the vertical length is 4.0 mm, the horizontal length of the second rectangular portion 150 is 14 mm, the vertical length is 2.0 mm.

3A to 3C are diagrams illustrating embodiments in which the UWB small antenna 100 of FIG. 1 is installed in a terminal.

Referring to FIG. 3A, the UWB miniature antenna 100 is located on one surface of the circuit board 200. In FIG. 3A, a dielectric layer 220 is formed on the entire surface of the circuit board 200, and a conductive ground portion 210 is formed on a portion of the top surface of the dielectric layer 220. The ground portion 210 has a concave rectangular groove 210a formed at one side thereof. The UWB miniature antenna 100 is positioned on the dielectric layer 220, at least a portion of the feed portion 110 is located in the groove 210a, and the remaining portion of the feed portion 110, the first trapezoidal portion 120, the first portion. The second trapezoidal part 130, the first rectangular part 140, and the second rectangular part 150 are positioned on the dielectric layer 220 on the upper surface of the circuit board 200, and the UWB miniature antenna 100 and the ground part 210 are provided. Are spaced apart and not electrically connected to each other. The feed part 110 and the ground part 210 positioned in the groove 210a form a CPW feed structure.

Referring to the simulation result of FIG. 4A, in the UWB small antenna 100 shown in FIG. 3A, the VSWR (Voltage Standing Wave Ratio) has a maximum value of about 2 in the 2 GHz to 10 GHz band, and thus shows excellent input matching. Can be.

Referring to FIG. 3B, the UWB miniature antenna 100 is bent over two surfaces of the circuit board 200. In FIG. 3B, the dielectric layer 220 is formed on the entire surface of the circuit board 200, and a conductive ground portion 210 is formed on a portion of the upper surface of the dielectric layer 220. The ground portion 210 has a concave rectangular groove 210a formed at one side thereof. The UWB miniature antenna 100 is bent on the dielectric layer 220, at least a portion of the feed portion 110 is located in the groove 210a, and the remaining portion of the feed portion 210, the first trapezoidal portion 120. And the second trapezoidal part 130 is positioned on the dielectric layer 220 on the upper surface of the circuit board 200, and the first rectangular part 140 and the second rectangular part 150 are bent at right angles to the side of the circuit board 200. Located on the dielectric layer 220 of the, UWB small antenna 100 and the ground portion 210 is spaced apart and are not electrically connected. The feed part 110 and the ground part 210 positioned in the groove 210a form a CPW feed structure.

Referring to the simulation result of FIG. 4B, in the UWB small antenna 100 shown in FIG. 3B, it can be seen that VSWR has an excellent input matching with a peak value of less than 2 in the 2 GHz to 10 GHz band.

Referring to FIG. 3C, the UWB miniature antenna 100 is bent over three surfaces of the circuit board 200. In FIG. 3C, the dielectric layer 220 is formed on the entire surface of the circuit board 200, and a conductive ground portion 210 is formed on a portion of the upper surface of the dielectric layer 220. The ground portion 210 has a concave rectangular groove 210a formed at one side thereof. The UWB miniature antenna 100 is bent on the dielectric layer 220, at least a portion of the feed portion 110 is located in the groove 210a, and a portion of the feed portion 210 and the first trapezoidal portion 120. Is positioned on the dielectric layer 220 on the upper surface of the circuit board 200, the second trapezoidal portion 130 is bent at a right angle and positioned on the dielectric layer 220 on the side of the circuit board 200, and the second rectangular portion 140 is disposed on the dielectric layer 220. ) And the second rectangular part 150 are bent at right angles to be positioned on the dielectric layer 220 on the bottom surface of the circuit board 200, and the UWB miniature antenna 100 and the ground part 210 are spaced apart from each other and are not electrically connected. The power supply unit 110 and the ground unit located in the groove 210a form a CPW power supply structure.

Referring to the simulation results of FIG. 4C, in the UWB small antenna 100 shown in FIG. 3C, the VSWR is relatively excellent at less than 2 in the band of about 6 GHz to 9 GHz, but the VSWR rises in the low band and the high band. Can be.

4A to 4C, it can be seen that VSWR is the best when bent once between the second trapezoidal part 130 and the first rectangular part 140 as shown in FIG. 3B.

The UWB miniature antenna 100 bent in FIGS. 3B and 3C is shown to be located on the surface of the circuit board 200. However, the present invention is not limited thereto, and the bent portion of the UWB small antenna 100 may be spaced apart from the circuit board 200 and positioned on an inner wall (not shown) of the terminal case.

For example, when bent once as shown in FIG. 3B, at least a portion of the feed portion 110 is located in the groove 210a, and the remaining portion of the feed portion 110 and the first trapezoidal portion 120 are circuit boards. Located on the dielectric layer 220 of the upper surface of the 200, the second trapezoidal portion 130 is located between the circuit board 200 and the inner wall of the case, the first rectangular portion 140 and the second rectangular portion 150 May be bent and in close contact with the side inner wall of the case.

Alternatively, when bent twice as shown in FIG. 3C, at least a part of the feed part 110 is positioned in the groove 210a, and the remaining part of the feed part 110 and the first trapezoidal part 120 are the circuit board 200. ) And the second trapezoidal portion 130 is bent to be in close contact with the side inner wall of the case, and the first rectangular portion 140 and the second rectangular portion 150 are bent to the inner wall of the lower surface of the case. You can stick. As such, when the inner wall of the terminal case is used, the antenna volume can be reduced, thereby effectively using the internal space of the terminal.

Alternatively, the UWB miniature antenna 100 may be partially positioned on the circuit board 200 and the other part of the UWB miniature antenna 100 in a space between the circuit board 200 and the inner wall of the case.

The shape and installation location of the UWB small antenna 100 will be determined according to the structure of the actual terminal and the desired performance.

The UWB miniature antenna 100 of FIG. 3B was actually fabricated and tested for performance. In actual production, the first rectangular part 140 and the second rectangular part 150 of the UWB miniature antenna 100 are located in close contact with the inner wall of the case.

5A-5C show the measured antenna gain values. FIG. 5A shows the antenna gain value measured in the H-plane, FIG. 5B shows the antenna gain value measured in the E1-plane, and FIG. 5C shows the antenna gain value measured in the E2-plane. 5A to 5C, the radial direction represents dBi, and the circumferential direction represents a rotation angle. Purple is measured at 3.1 GHz, red is measured at 3.9 GHz, and green is measured at 4.8 GHz.

The measured values are summarized in Table 1 below.

frequency
(MHz) Peak gain (dBi) Average gain (dBi) efficiency(%)
H E1 E2 H E1 E2 3100 -1.35 -0.26 -0.37 -5.70 -5.88 -6.73 33.58 3900 -0.58 -1.44 -0.18 -2.60 -4.05 -3.79 46.74 4800 -0.17 -0.41 -2.66 -3.67 -4.65 -7.37 37.40

As can be seen in FIGS. 5A-5C and in Table 1, the actually fabricated antenna has high efficiency in very wide bands of 3.1 GHz, 3.9 GHz and 4.8 GHz. In addition, since this result corresponds to the simulation value shown in FIG. 4B, it is expected that the antenna according to the present invention has a high efficiency in the UWB of 3.1 to 10.6 GHz.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, and all such changes and modifications are It is obvious that it belongs to the scope of the appended claims.

Claims (9)

As an ultra-wideband miniature antenna built into a terminal,
A rectangular feeder;
A first trapezoidal portion extending from an upper portion of the feeding portion and having an equilateral trapezoidal shape, the length of the lower side being longer than the horizontal length of the feeding portion, and the length of the upper side being longer than the length of the lower side;
A second trapezoidal part extending from an upper portion of the first trapezoidal part and having an equilateral trapezoidal shape, the length of the lower side being equal to the length of the upper side of the first trapezoidal part, and the length of the upper side longer than the length of the lower side;
A first rectangular portion extending from an upper portion of the second trapezoidal portion, having a rectangular shape, and having a horizontal length equal to a length of an upper side of the second trapezoidal portion; And
Extend from an upper portion of the first rectangular portion, have a rectangular shape, and the horizontal length includes a second rectangular portion longer than the horizontal length of the first rectangular portion,
The feed part, the first trapezoidal part, the second trapezoidal part, the first rectangular part and the second rectangular part are integrally formed,
And the angle between the non-parallel sides of the first trapezoidal portion is smaller than the angle between the non-parallel sides of the second trapezoidal portion. The method of claim 1,
The ultra-wideband small antenna for terminal built-in is made of a flexible conductor. delete A terminal having an ultra-wideband small antenna,
The ultra-wideband miniature antenna is integrally manufactured and installed on at least a part of the surface of the substrate located inside the terminal.
Square feed unit;
A first trapezoidal portion extending from an upper portion of the feeding portion and having an equilateral trapezoidal shape, the length of the lower side being longer than the horizontal length of the feeding portion, and the length of the upper side being longer than the length of the lower side;
A second trapezoidal part extending from an upper portion of the first trapezoidal part and having an equilateral trapezoidal shape, the length of the lower side being equal to the length of the upper side of the first trapezoidal part, and the length of the upper side longer than the length of the lower side;
A first rectangular portion extending from an upper portion of the second trapezoidal portion, having a rectangular shape, and having a horizontal length equal to a length of an upper side of the second trapezoidal portion; And
Extend from an upper portion of the first rectangular portion, have a rectangular shape, and the horizontal length includes a second rectangular portion longer than the horizontal length of the first rectangular portion,
And an angle between the non-parallel opposite sides of the first trapezoidal portion is smaller than an angle between the non-parallel side of the second trapezoidal portion. The method of claim 4, wherein
The ultra wide band small antenna is a terminal having an ultra wide band small antenna, characterized in that installed on the surface of the substrate. The method of claim 4, wherein
The ultra-wideband small antenna is a flexible, the terminal is embedded with the ultra-wideband small antenna, characterized in that is installed bent at the edge of the substrate. The method of claim 4, wherein
The ultra-wideband miniature antenna is flexible, a part including the power supply unit is installed on the surface of the substrate, the other part is a terminal containing an ultra-wideband miniature antenna, characterized in that installed on the inner wall of the outer case of the terminal . The method according to claim 6 or 7,
The ultra-wideband small antenna is a terminal having an ultra-wideband small antenna, characterized in that the second trapezoidal portion and the first rectangular portion is bent at a right angle. The method of claim 4, wherein
The substrate further includes a grounding portion which is installed on the surface,
And the power supply unit and the ground unit form an ultra-wideband miniature antenna, characterized in that it forms a CPW (Coplanar Waveguide) feed structure.

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