KR100812281B1 - Film-type Macro wave Antenna - Google Patents

Abstract

A flexible film type high frequency antenna using a synthetic resin dielectric material is provided. Such an antenna includes a flexible plate-like dielectric and a co-planar waveguide (CPW) lead coated on the dielectric, wherein the CPW lead is a signal line located at the center and on both sides of the signal line. It consists of two ground wires positioned symmetrically, and these CPW leads are axially covered with the dielectric. In this case, a portion of one end of each of the ground lines that is covered in the dielectric is formed to protrude in the axial direction, and a portion of which the signal line ends are covered is concave in the axial direction. By inserting and fixing the insertion hole formed in the site, the signal line and the ground line can be stably connected to the center pin and the outer conductor of the connector, respectively. According to the high frequency antenna of the present invention, a resonance effect can be obtained in multiple bands, and the appearance of the antenna can be flexibly modified through the tilt portion.

Film Antenna, Flexible, CPW, Multiband, Polyester, Tilt

Description

Film-type high frequency antenna {Film-type Macro wave Antenna}

1 is a plan view of the antenna unit of the high-frequency antenna according to the present invention.

2 is an exploded perspective view of a high frequency antenna according to the present invention;

3 and 4 are views showing a structure in which the antenna unit is fixed to the insertion hole of the connector in the present invention.

5 is a perspective view showing a state in which the high frequency antenna according to the present invention is mounted externally to a communication terminal.

6 is a return loss characteristic of the high frequency antenna according to the present invention.

7 is a standing wave ratio (VSWR) characteristic diagram of a high frequency antenna according to the present invention;

8 is a Smith chart showing the operating characteristics of the high-frequency antenna according to the present invention.

9 is a graph illustrating an H-Field radiant pattern of a high frequency antenna according to the present invention.

10 is a graph illustrating an E-Field radiant pattern of a high frequency antenna according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: dielectric 20: lead wire

21: signal line 22, 23: ground wire

30: power supply unit 50: antenna convergence unit

100 antenna portion 200 sleeve conduit

300: insulation protective cover 400: connector

410: center pin 420: outer conductor

421: insertion hole 500: tilt portion

The present invention relates to a flexible film type high frequency antenna in which a CPW lead is copper-etched on a dielectric of a synthetic resin material. Consisting of two ground wires, the CPW lead wire being axially coated on the dielectric material, wherein one end of each ground wire is covered by the axial convex portion and the signal wire end is covered by the axial direction. It relates to a film-type high frequency antenna, characterized in that it is formed to be.

As mobile communication services become more common, mobile communication terminals have become a necessity of modern man. Among the components that make up the mobile terminal, the antenna is a key component that determines call quality.In the mobile terminal, commercially available antennas and sleeve dipole antennas are a combination of two antennas suitable for signal waiting and call states. It is used.

Here, the combination antenna of the former is a combination of a spring-shaped helical antenna protruding from the top of the terminal and a dipole antenna used to be pulled up to increase the call quality, and the terminal is horizontal to the ground. If the position of the antenna is located, the dipole antenna needs help, and a matching circuit must be installed between the antenna and the duplexer to compensate for this.

In addition, the latter sleeve dipole antenna has a structure in which the middle portion is surrounded by a concentric sleeve, and uses a sleeve formed in a hat shape of λ / 4 on the feed cable near the terminal, so that the loss is efficient, but the coaxial transmission line and the multiple sleeves And a matching circuit for matching the impedance of the antenna and the impedance of the transmitter.

The antennas have to produce and arrange two antennas or a plurality of sleeves on a coaxial transmission line, and both require a large number of parts, which causes a complicated manufacturing process and a high defect rate during the process.

In addition, there is a problem in that there is little room for modification in the design of the antenna because it has to be made in a fixed form in the nature of the antenna.

The present invention has been proposed to solve the above problems, and an object thereof is to provide a film-type antenna which is simple and freely deformable in the manufacturing process.

Another object of the present invention is to provide a coupling structure for stably connecting the film-type antenna and the connector to ensure a smooth feeding.

The film-type high frequency antenna of the present invention for achieving the above object includes a flexible flat dielectric and a conductor coated on one surface of the dielectric by a co-planar waveguide (CPW) feeding method. It is done by

Here, the CPW lead may be composed of one signal line positioned at the center and two ground lines positioned symmetrically on both sides of the signal line. In this case, the signal line and the ground line are formed long in the axial direction, and the signal line is a ground line It is preferable that the length is longer than the predetermined length.

In addition, one of the ground wires of the ground wires on both sides may be formed longer by a predetermined length than the ground wire of the other side.

In addition, the dielectric is preferably formed so that the portion of the one end of each ground line is coated in the axial direction, the portion is coated with the signal line end of one side is preferably formed concave in the axial direction.

The antenna may further include a sleeve conduit axially surrounding a portion of the dielectric and the CPW lead, and an insulation protective cover surrounding the entirety of the dielectric, the CPW lead and the sleeve conduit.

In addition, a center pin electrically connected to the signal line and an external conductor electrically connected to the ground line may include a connector for connecting the signal line to an external communication device, wherein a part of the external conductor The insertion hole may be formed to insert a portion of the plate-like dielectric to fix the signal line and the ground line coated on the corresponding portion to the center pin and the outer conductor, respectively.

Such a connector may further include a tilt part for intermittently folding a specific portion of the dielectric coated with the CPW lead at an angle of a predetermined unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, in adding reference numerals to the components of each drawing, it should be noted that the same components are denoted by the same reference numerals even though they are shown in different drawings.

1 is a plan view of an antenna unit of a high frequency antenna according to the present invention.

The dielectric 10 is formed of a flat plate having a thickness of about 0.125 mm using a flexible synthetic resin material having electrical insulation, such as polyester, polyamide, and vinyl chloride.

One surface of the planar dielectric 10 is coated with a conductive wire 20 by a co-planar waveguide (CPW) feeding method. Such a conductive wire is made of a conductive material such as copper or aluminum, and may be coated in a manner of being deposited on the dielectric 10 through a predetermined masking member, and corrosion of the remaining portion after the entire deposition is performed (etching). It may also be coated in a way.

In this case, the CPW feeding method implements a feeding structure on the same plane as the ground plane, and since the signal lines and the ground (GND) are present on the same plane, all the devices mounted on the surface are cleanly mounted on the top plane. In addition, since there is no need to drill through holes through the ground (GND) on the back side, the manufacturing process is simplified and the risk of short circuit between the signal line and the ground (GND) is reduced. In addition, the dispersion and the feed loss is less than the conventional micro strip line, there is an advantage that the parasitic effect due to the through-holes in the area of the millimeter waveform and the like is reduced.

In the present invention, the CPW lead 20 is composed of one signal line 21 positioned at the center and two ground lines 22 and 23 positioned symmetrically on both sides of the signal line, and each lead is a flat dielectric 10. ) Is formed long in the axial direction. In this case, the signal line 21 is formed to be relatively longer than the ground lines 22 and 23, and a gap is formed with a predetermined width between the signal line 21 and the ground lines 22 and 23. The length of the signal line 21 and the ground lines 22 and 23 and the interval width between the conductive lines are designed such that the antenna has a predetermined impedance value required in the corresponding operating frequency band. As an example, if the operating frequency band of the antenna is a CDMA band of about 800 MHz, the length and the width of each conductive wire may be formed to have an impedance of 50 ohms.

및

형상으로 구현하였으나 반드시 이에 한정하는 것은 아니다. 또한, 양쪽 접지선(22, 23)의 길이를 서로 상이하게 설계함으로써 당해 안테나가 적용될 단말기의 동작 주파수 대역을 1.7GHz(for PCS), 2.3~2.5(for WLL), 12.2~12.75GHz or 13.75~14.5GHz(for DMB) 등으로 조정할 수 있다.The ground lines 22 and 23 preferably include one or more bends to smoothly resonate with the signal lines 21. In this embodiment, each ground wire is

And

Although implemented in the shape is not necessarily limited thereto. In addition, by designing the lengths of both ground wires 22 and 23 different from each other, the operating frequency band of the terminal to which the antenna is applied is 1.7 GHz (for PCS), 2.3 to 2.5 (for WLL), 12.2 to 12.75 GHz or 13.75 to 14.5. GHz (for DMB) or the like.

Meanwhile, when the planar dielectric 10 and the CPW lead 20 are collectively referred to as the antenna unit 100, the CPW lead 20 is connected to one side of the antenna unit 100 to the antenna convergence unit 50 of the external communication terminal; 4 is provided with a power supply unit 30 for connection. The power supply unit 30 is indirectly connected to an external communication terminal through the connector 400. In order to effectively connect the connector 400, the power supply unit 30 is preferably implemented in the following shape.

" 또는 말굽 형상으로 구현되는 것이 바람직하다. 이와 같은 형상의 급전부(30)가 커넥터(400)에 결합되는 구체적인 메카니즘은 도 2의 커넥터(400) 관련 부분에서 설명하기로 한다.That is, in the dielectric 10 corresponding to the power supply unit 30, a portion at which one end of each of the ground lines 22 and 23 is coated is formed to protrude in the axial direction, and a portion at which the signal line end of the one side is covered is a shaft. Direction concave, as a whole,

Or it is preferably implemented in a horseshoe shape. The specific mechanism in which the feed portion 30 of this shape is coupled to the connector 400 will be described in the relevant section of the connector 400 of FIG.

Looking at each configuration of the film type high frequency antenna of the present invention including the antenna unit 100 as described above are as follows. For reference, Figure 2 is an exploded perspective view of a high frequency antenna of the present invention.

The sleeve conduit 200 surrounds the dielectric 10 and a portion of the CPW lead 20 in the axial direction and is not electrically connected to the CPW lead 20 therein. The sleeve conduit 200 is preferably made of aluminum to prevent the wavelength is distorted. In addition, when the sleeve conduit 200 is mounted on one side of the connector 400 or the tilt part 500 with the antenna unit 100 mounted therein, the axial length of the sleeve conduit 200 is the corresponding conduit 200. It is preferable that a distance of one quarter wavelength (λ / 4) of the operating frequency band (such as 800 MHz) of the antenna is maintained between the end of the antenna and the end portion 40 of the antenna.

An insulating protective cover 300 surrounds the entirety of the dielectric 10, the CPW lead 20 and the sleeve conduit 200 to protect the internal components 10, 20, 200 from foreign matter and impact from the outside. .

The connector 400 plays an intermediate role of connecting the signal line 20 of the antenna to an external communication terminal, and an external conductor electrically connected to the center pin 410 and the ground line 10 electrically connected to the signal line 20. 420, and an insulator 430 separating the center pin 410 and the outer conductor 420. Since the connector 400 is commonly used when connecting an antenna to a wireless subscriber network service terminal, a detailed description thereof will be omitted. However, in the present invention, the signal line 21 and both ground lines 22 and 23 of the power supply unit 30 are connected to the center pin 410 and the outer conductor 420 of the connector on the outer circumference of the outer conductor 420, respectively. An insertion hole 421 (see FIG. 4) is preferably formed to insert and feed the feed part 30 of the flat panel antenna so as to be stably connected.

3 and 4 illustrate a mechanism in which the feeder 30 of the antenna is coupled to the insertion hole 421 of the connector.

" 또는 말굽 형상으로 구현되는 경우 돌출된 부분의 접지선(22, 23)은 상기 각각의 슬릿형 홈에 삽입 및 고정되어 외부 도체(420)에 접속되고, 접지선(22, 23)이 슬릿형 홈에 삽입되는 깊이만큼 축 방향으로 만입된 부분(오목한 부분)의 신호선(21)은 중심핀(410)에 접속된다. 이 경우, 상기 중심핀(410)의 선단에는 삽입홈(422)가 형성되어 상기 급전부(300)의 신호선(21) 부분이 삽입되어 연결되는 것이 바람직하다. 상기 급전부(30)는 결합된 후 상기 외부 도체(420)를 외측으로부터 압착함에 따라 안정적으로 고정된다. 상기한 바와 같이, 외부 도체(420) 외주에 형성된 삽입구(421)이 90°간격으로 4 개가 십자형으로 형성되는 경우에는, 상기 외부 도체(420)의 압착시상기 삽입구(421)에 의해 분할된 외부 도체(420)의 각 부분들이 내측으로 동일한 정도로 압착되어 상기 급전부(30) 부분을 안정적으로 고정시킬 수 있다. The insertion hole 421 may be implemented as two or more slit-shaped grooves for inserting the film-type feed section 30, and the paired grooves are preferably formed to be symmetrical to each other. According to a preferred embodiment, four insertion holes 421 are formed on the outer circumference of the outer conductor 420 in a cross shape at four intervals of 90 °. Here, as described earlier, the feeder 30 of the antenna is "

Or the horseshoe shape, the ground wires 22 and 23 of the protruding portion are inserted into and fixed to the respective slit grooves and connected to the outer conductor 420, and the ground wires 22 and 23 are connected to the slit grooves. The signal line 21 of the portion (concave) indented in the axial direction by the depth to be inserted is connected to the center pin 410. In this case, an insertion groove 422 is formed at the tip of the center pin 410, It is preferable that the signal line 21 portion of the feed section 300 is inserted and connected to the feed section 30. After the feed section 30 is coupled, it is fixed stably by pressing the outer conductor 420 from the outside. Likewise, when four insertion holes 421 formed on the outer circumference of the outer conductor 420 are cross-shaped at intervals of 90 °, the outer conductor 420 divided by the insertion hole 421 when the outer conductor 420 is crimped. Each portion of the) is pressed inward to the same degree so that the feed portion The 30 part can be fixed stably.

The tilt part 500 intermittently folds a specific portion of the dielectric coated with the CPW lead 20 at a predetermined unit angle so that the antenna part 100 can be bent at a desired angle. The tilt portion 500 is also conventionally used as a conventional description thereof will be omitted.

5 is a perspective view illustrating a state in which a high frequency antenna according to the present invention is mounted externally to a communication terminal. The communication terminal may include a mobile communication terminal used for wireless communication such as a cellular phone, a PCS phone, a PDA, a PMP, a DMB terminal, a wireless subscriber network service, VoIP, Wi-Bro, and a wireless LAN.

In the high frequency antenna of the present invention mounted on the antenna converging portion 50 of the communication terminal as shown in the drawing, it is preferable that the antenna portion 100 is perpendicular to the ground by mounting the tilt portion 500 by folding at 90 °. . Although not shown in the drawing, as the shape of the communication terminal is diversified, the location where the antenna convergence unit is provided may also be various points. The high frequency antenna of the present invention may include the tilt unit 500 regardless of where the antenna convergence unit is provided. It can be maintained perpendicular to the ground by folding and mounting at an appropriate angle. However, since the antenna of the present invention implements an omnidirectional radiation pattern, the antenna does not necessarily need to be perpendicular to the ground, but in general, it is possible to minimize the installation area of the communication terminal in addition to the aspect that the transmission and reception rate may be improved. The importance of the tilt part 500 is recognized also from the side.

Next, various operating characteristics of the film-type high frequency antenna of the present invention will be described.

Figure 6 shows the return loss (Return Loss) characteristics of the film-type high frequency antenna according to the invention.

The service band (or operating frequency band) of the antenna according to the present invention is 824 MHz to 894 MHz, which corresponds to the CDMA band for wireless communication. As shown, 824 MHz, 859 MHz, and 894 MHz points belonging to the service band may be marked as marker 1 (▽ 1 in the figure), marker 2 (▽ 2 in the figure), and marker 3 (▽ 3 in the figure), respectively. In this case, it can be seen that the return loss is implemented at -12 dB or less at all corresponding points. This indicates that the loss of the reflected power is relatively good compared to the conventional sleeve dipole antenna, and because it maintains a wide width, it can be seen that it is particularly suitable for a terminal for mobile communication.

Fig. 7 shows the standing wave ratio (VSWR) characteristics of the film type high frequency antenna according to the present invention.

As shown, the maximum standing wave ratio for 50 ohms (Ω), which is set to the resonance impedance of this embodiment in the operating frequency band, is represented by 1: 1.272 to 1.437. That is, in the antenna of the present invention, when the ideal standing wave ratio is 1, the standing wave ratio at the marker 1 is 1.437, the standing wave ratio at the marker 2 is 1.272, and the standing wave ratio at the marker 3 is 1.399. It can be seen that the standing wave ratio for the resonance impedance 50 Ω in the frequency band is also relatively good compared to the conventional sleeve dipole antenna.

8 is a Smith chart showing the operating characteristics of the high frequency antenna according to the present invention.

As shown, when the resonance impedance is 50 ohms in the operating frequency band, the impedance appears as 32.90 ohms in the marker 1, the 51.56 ohms in the marker 2, and the 42.93 ohms in the marker 3. It can be seen that it is represented by Ω), which means that the resonance frequency is approximated to the resonance frequency and thus operates without difficulty in the operating frequency band.

9 is a graph illustrating an H-Field radiant pattern of a high frequency antenna according to the present invention. As shown, since the antenna of the present invention implements an omnidirectional radiation pattern, it can be seen that there is no limitation in directionality. That is, since it can transmit and receive at any location, it can be usefully used for a mobile communication terminal requiring frequent location movement.

10 is a graph illustrating an E-Field radiant pattern of a high frequency antenna according to the present invention. As shown, since the antenna of the present invention implements a radiation pattern in the form of a dipole, the antenna has similar characteristics regardless of the type of the terminal to which the antenna is applied.

In the foregoing 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 scope of the following claims, but also by those equivalent to the scope of the claims.

According to the present invention, by implementing the antenna in the form of a film, it is possible to simplify the configuration of the entire antenna compared to the conventional antenna schemes, which simplifies the manufacturing process of the antenna and lowers the incidence of defective products during the process, resulting in a large production cost. Can be lowered.

In addition, in the film-type antenna can support a variety of bands according to the design of the lead and dielectric, it is easy to mass-produce the antenna of the desired band with a simple design change.

On the other hand, because of the high flexibility of the antenna can be designed in various ways, the width of the applicable mobile communication terminal can be widened, and the feed of the film-type antenna is fixed and connected in a manner that is inserted into the connector, it is possible to supply a stable feed.

Claims (11)

Flexible planar dielectric; And And a conductive wire coated on one surface of the dielectric in a co-planar waveguide (CPW) feeding manner. The CPW lead is composed of one signal line positioned at the center and two ground lines positioned symmetrically on both sides of the signal line. The signal line and the ground line is formed long in the axial direction, the signal line is formed longer by a predetermined length than the ground line, The film-type high frequency antenna, characterized in that the ground line of one side of the ground line of the both sides is formed longer by a predetermined length than the ground line of the other side. delete delete delete The method of claim 1, wherein the dielectric A portion coated at one end of each ground line is formed to protrude in the axial direction, and a portion coated at one end of the signal line is formed concave in the axial direction. The method of claim 5, And a sleeve conduit axially surrounding a portion of the dielectric and the CPW lead. The method of claim 6, And an insulating protective cover surrounding the entirety of the dielectric, the CPW lead, and the sleeve conduit. The method according to any one of claims 1 and 5 to 7, And a center pin electrically connected to the signal line, an outer conductor electrically connected to the ground lines on both sides, and an insulator separating the center pin and the outer conductor, and a connector for connecting the signal line with an external communication device. Film-type high frequency antenna further comprises. The method of claim 8, wherein the outer circumference of the outer conductor A film type high frequency antenna, characterized in that the insertion hole for inserting a portion of the plate-like dielectric is fixed so that the signal line and the ground line coated on the portion is connected to the center pin and the outer conductor, respectively. The film type high frequency antenna according to claim 8, wherein an insertion groove is formed at a tip of the center pin to insert and cover the coated signal line portion. The method of claim 9, wherein the connector And a tilt portion for intermittently folding a specific portion of the dielectric coated with the CPW lead at an angle of a predetermined unit.

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