KR100589699B1 - Multi-band integrated helical antenna - Google Patents

Abstract

The present invention discloses a multi-band stacked helical antenna, comprising: a dielectric body in which a plurality of dielectric sheets having a predetermined thickness are stacked; A loop pattern of a loop-shaped metal material having an opening angle is formed between the dielectric sheets and on top and bottom surfaces of the dielectric sheet, and the first metal pattern portion is formed by a first connection pattern electrically connecting the odd-numbered loop patterns. And a second metal pattern portion is formed by a second connection pattern electrically connecting the even-numbered loop patterns to each other, wherein the length of the first metal pattern portion and the length of the second metal pattern portion are different from each other to form a wide band in a single band. It has a resonance characteristic of or characterized in that it has a multi-band resonance characteristics.

In addition, by minimizing the size of the multi-band stacked helical antenna can be obtained inside the terminal.

Description

Multiband Stackable Helical Antenna {MULTI-BAND INTEGRATED HELICAL ANTENNA}

1 is a perspective view showing a multi-band stacked helical antenna according to the present invention;

2 is a perspective view showing a metal pattern of a multi-band stacked helical antenna according to the present invention;

3 is a graph showing resonance characteristics of a multi-band according to the present invention;

4 is a graph showing the resonance characteristics of a broadband according to the present invention;

5 is an exploded cross-sectional view illustrating a laminated structure of a multi-band stacked helical antenna according to the present invention;

6 is a plan view and a bottom view of a dielectric sheet located on the top layer of a multi-band stacked helical antenna according to the present invention;

7 is a plan view and a bottom view of the dielectric sheet located on the second layer of the multi-band stacked helical antenna according to the present invention;

8 is a plan view and a bottom view of the dielectric sheet located on the third layer of the multi-band stacked helical antenna according to the present invention.

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

10; Dielectric body 11; Dielectric sheet

20; First metal pattern portion 21; 2nd metal pattern part

22; Loop pattern 23a; First connection pattern

23b; Second connection pattern 24; Via Hole

30; Bonding layer 31; septum

32; Contact

The present invention relates to an antenna of a mobile communication terminal or a wireless communication terminal for transmitting and receiving electromagnetic signals, and more particularly, to a dual-band and single-band built-in antenna and a method of manufacturing the same that can vary the impedance of the antenna.

With the rapid development of analog and digital communication technology in the world, various kinds of mobile communication services such as cellular, PCS, GSM, PHS and iridium services using satellites are being implemented. In Korea, cellular, PCS and CT -2 and the like are in commercial service. Personal handheld terminals used for mobile communication services have been developed for the purpose of miniaturization, multifunction, light weight and low power, and antennas, which are essential for base stations and terminals, are the key components that determine the call quality at the beginning and end of signal input and output. . In particular, since the performance of the small antenna varies depending on the type and material of the terminal to be mounted, unlike other core components, there is a difficulty in that the design varies according to the terminal model in order to obtain optimal performance.

Recently, unlike a mobile communication service using a single frequency band, according to a trend that a service capable of communication anywhere in the world is being developed, a method of receiving a plurality of different services using a single terminal has been developed. Antennas and various components mounted in the multi-service terminal must operate normally in two or more frequency bands while satisfying existing size and electrical standards.

Especially in the case of antennas, cellular (824 ~ 894MHz) and PCS (1750 ~ 1870MHz) are centered at about 1GHz, and each center frequency is matched to the existing antenna because each center frequency is not an integer multiple of each other's harmonics. Designing a circuit alone is difficult to use in both frequency bands. In addition, it can be used in the existing method, and should be available in the next generation mobile communication service with wider frequency band and two different mobile communication service bands as in IMT-2000.

In general, a small antenna for a terminal mainly uses a non-directional retractable antenna for the purpose of bidirectional communication and easy portability. The antennas of commercially available terminals are in the form of a combination of two antennas suitable for a signal standby state and a call state, and antennas for easily transmitting and receiving linear polarized signals are used. The protruding part on the top of the terminal is usually a spring-shaped helical antenna, which has the advantage of being able to make a call regardless of the position of the terminal. Pulled to the top to improve call quality, it is a monopole antenna that performs better than a helical antenna when it is perpendicular to the earth's surface. In theory, it is impossible to receive a signal when it is horizontal. These antennas show a lot of performance difference when mounted according to the type of terminal, and a matching circuit is installed between the antenna and the duplexer to compensate for this.

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의 물리적인 공진 길이로 나선형으로 감아져 있으며, 그라운드 면과 급전선을 가지고 있는 구조로 되어 있다. Helical antenna uses a conductive object

And

It is wound in a spiral with the physical resonance length of and has a structure with a ground plane and a feed line.

In particular, the conventional stacked helical antenna is a single band helical antenna implemented using vertical vias and horizontal patterns using a ceramic sheet of tens to hundreds of micrometers thick, and the implemented antenna is structurally narrow. Not only does it show a single-band characteristic of the width, it also has a disadvantage that it cannot be used in the dual band.

In addition, the conventional stacked helical antenna is manufactured using a dielectric sheet having a thickness of tens to hundreds of micrometers, so it is required to go through 200-600 lamination processes in order to stack an appropriate height of 5 to 15 mm, which is required as an antenna. It takes a lot of time and also uses a press in the lamination process at this time has a problem that the pattern of the conductor is deformed due to the press pressure.

Recently, smaller antennas are required due to the miniaturization of mobile communication terminals. In order to make existing antennas smaller, it is necessary to go to a structure having more rotations instead of reducing the diameter of the helical antenna and lowering the pitch. Since it brings about the change of the spatial radiation resistance of electromagnetic waves and also shows the narrow-band antenna characteristics, there are many structural problems in reducing to the conventional helical antenna structure.

Accordingly, the present invention is to solve the above disadvantages, to provide a multi-band stacked helical antenna that can be used in two or more different mobile communication service bands as well as having a broadband resonance characteristics. The purpose is.

In addition, another object of the present invention is to provide a multiband stacked helical antenna having a built-in stacked helical antenna and minimizing its size to minimize an installation space inside the terminal.

According to an aspect of the present invention, there is provided a stacked helical antenna that can be used in a single band or a plurality of bands, comprising: a dielectric body including a plurality of dielectric sheets stacked with a predetermined thickness; A loop pattern of a loop-shaped metal material having an opening angle is formed between the dielectric sheets and on top and bottom surfaces of the dielectric sheet, and the first metal pattern portion is formed by a first connection pattern electrically connecting the odd-numbered loop patterns. And a second metal pattern portion is formed by a second connection pattern electrically connecting the even-numbered loop patterns to each other, wherein the length of the first metal pattern portion and the length of the second metal pattern portion are different from each other to form a wide band in a single band. It has a resonance characteristic of or characterized in that it has a multi-band resonance characteristics.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

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

1 is a perspective view showing a multi-band stacked helical antenna according to the present invention, Figure 2 is a perspective view showing a metal pattern of the multi-band stacked helical antenna according to the present invention.

1 and 2, the multi-band stacked helical antenna according to the present invention is a dielectric body 10 having a rectangular parallelepiped shape and a metal material capable of performing a helical antenna function inside the dielectric body 10. The metal pattern parts 20 and 21 formed of the loop pattern 22 and the connection pattern 23 are formed.

In the dielectric body 10 according to the present invention, a plurality of dielectric sheets 11 having a predetermined thickness t are stacked, and the metal pattern parts 20 and 21 according to the present invention have a loop shape having an opening angle. The metal loop patterns 22 are formed at regular intervals in the vertical direction, and the first metal pattern portions 20 are formed by the first connection patterns 23a electrically connecting only odd-numbered loop patterns. The second metal pattern portion 21 is formed by the second connection pattern 23b electrically connecting only even-numbered loop patterns. In particular, the length of the first metal pattern portion 20 and the length of the second metal pattern portion 21 are different from each other so as to have a wide band resonance characteristic in a single band or a multi band resonance characteristic.

According to an exemplary embodiment of the present invention, as shown in FIG. 2A, the number of loop patterns turns of the first metal pattern portion 20 and the second metal pattern portion 21 is different so as to be different in different bands. It has a resonance characteristic. 3 is a graph showing resonance characteristics of a multi-band according to the present invention. That is, the resonant frequency is determined by the resonant length of the first metal pattern part 20, and the second metal pattern part 21 is resonated at another frequency to operate as an antenna operating in multiple bands. .

Further, according to another preferred embodiment of the present invention, as shown in Figure 2b, the number of loop pattern turns of the first metal pattern portion 20 and the second metal pattern portion 21 is the same Only the length is slightly different (l) to have a wideband resonance characteristic. 4 is a graph showing the resonance characteristics of a broadband according to the present invention. That is, the resonance frequency is determined by the resonance length of the first metal pattern portion 20 and the resonance of the second metal pattern portion 21 occurs at a frequency close to the resonance frequency of the first metal pattern portion 20. The plurality of adjacent resonant frequency characteristics shows a wider resonance characteristic than the resonance characteristic by the single metal pattern portion.

Exemplary drawings show an example in which two sets of antennas divided into odd and even numbers among a plurality of loop patterns 22 are combined to simplify the description, but the present invention is not limited thereto. It can be separated to have a wideband resonance characteristics and a multi-band resonance characteristics of the antenna.

Typically, the overall length of the dielectric body 10 of the helical antenna may vary depending on the frequency of use, the length of the metal pattern and the connection pattern, and has a length of approximately 5 to 15 mm when used in a mobile communication antenna.

Accordingly, the multi-resonance characteristics are obtained by changing the electrical impedance in the equivalent circuit structure of the helical antenna according to the change in the length of the metal pattern. On the other hand, since the radiation characteristics and directivity of the multi-band stacked helical antenna according to the present invention exhibits the same characteristics as a conventional helical antenna, a detailed description thereof will be omitted.

Meanwhile, referring to FIG. 5 to FIG. 8, the multilayer structure of the multi band stacked helical antenna according to the present invention will be described.

First, a plurality of dielectric sheets 11 having a constant thickness t are prepared. On the lower surface of each dielectric sheet 11, a loop-shaped loop pattern 22 having an opening angle is formed to have the same diameter.

In the dielectric sheet 11a stacked on the uppermost layer, a via hole 24a is formed between the opening angles of the loop patterns 22a formed on the bottom surface thereof. On the other hand, a loop pattern 22b is formed on the upper surface of the dielectric sheet 11a to be electrically connected to the via hole 24a.

In the dielectric sheet 11b stacked below the uppermost layer, a via hole 24b coinciding with the via hole 24a is formed at the beginning of the loop pattern 22c formed on the lower surface thereof, and a via hole (between the opening angles of the loop pattern 22c). 24c) is formed.

On the other hand, in the dielectric sheet 11c stacked below, a via hole 24d corresponding to the via hole 24b is formed at the beginning of the loop pattern 22d formed on the lower surface thereof, and between the opening angles of the loop pattern 22d. Via holes 24e are formed.

The via holes 24a to e penetrate the upper and lower surfaces of each dielectric sheet 11 and fill metal therein with the same material as that of the loop pattern 22 to form the first connection patterns 23a and the first. 2 connection pattern 23b is formed.

That is, the loop pattern 22b is electrically formed by the loop pattern 22c and the via hole 24a and the via hole 24b formed through the dielectric sheet 11a and the dielectric sheet 11b and formed on the lower surface of the dielectric sheet 11b. The first metal pattern portion 20 is formed in a connected manner.

The second metal pattern portion 21 penetrates the loop pattern 22a formed on the lower surface of the dielectric sheet 11a and the loop pattern 22d formed on the lower surface of the dielectric sheet 11c through the dielectric sheet 11b and the dielectric sheet 11c. ) And the via hole 24c and the via hole 24d are electrically connected to each other. The via hole 24e of FIG. 8 is electrically connected to the loop pattern 22c.

Therefore, the first connection pattern 23a is formed by filling metal into the via holes 24a, 24b, 24e, 24f, 24i, etc. to electrically connect the odd-numbered loop patterns 22b, 22c, 22e, etc. from the uppermost layer. The second connection pattern 23b is formed by filling metal in the via holes 24c, 24d, 24g, 24h, etc. to electrically connect the even-numbered loop patterns 22a, 22d, 22f, and the like.

On the other hand, a bonding layer 30 coated with an adhesive material is formed on the upper surfaces of all the dielectric sheets 11 except for the uppermost dielectric sheet 11 for the lamination bonding of the dielectric sheets 11.

In addition, the bonding layer 30 disposed on the upper surface of the electrical bonding portion where the via hole is formed is removed, and preferably, partition walls 31a and 31b are formed to prevent the inflow of the adhesive material to form an adhesive coating around the connection patterns 23a and 23b. To prevent ingress. Each partition wall 31 is advantageously formed into a circular wall shape having a thickness of 0.5 to 1.5 mm to mask.

Another dielectric sheet 11 is laminated on the upper surface of the dielectric sheet 11 on which the bonding layer 30 is formed.

Preferably, in order to facilitate electrical contact between the upper surface of each via hole and the lower surface of the start end of each loop pattern 22, it is advantageous to form contact portions 32a and 32b using conductive materials on the contact portions, respectively. As the conductive material of the contact portion 32, a metal having good conductivity such as copper, silver, gold, or the like can be used.

On the other hand, each loop pattern 22 formed on the upper surface of the dielectric sheet 11 laminated on the uppermost layer remains open, while each loop pattern 22 formed on the lower surface of the dielectric sheet 11 laminated on the lowermost layer. The start of is electrically connected to a feed line for feeding power to the antenna pattern, and is connected to a matching circuit for matching the antenna.

In addition, the multi-band stacked helical antenna 40 according to the present invention is electrically connected to a feeding line for feeding power and a matching circuit for matching the antenna.

In the above description, it should be understood that those skilled in the art can only make modifications and changes to the present invention without changing the gist of the present invention as it merely illustrates a preferred embodiment of the present invention.

Therefore, as described above, the stacked helical antenna may be used in two or more different mobile communication service bands, and may have a broadband resonance characteristic. The effect can be obtained.

Claims (9)

In the stacked helical antenna that can be used in a single band or multiple bands, A dielectric body in which a plurality of dielectric sheets having a predetermined thickness are stacked; A loop pattern of a loop-shaped metal material having an opening angle is formed between the dielectric sheets and on top and bottom surfaces of the dielectric sheet, and the first metal pattern portion is formed by a first connection pattern electrically connecting the odd-numbered loop patterns. Formed, A second metal pattern part is formed by a second connection pattern which electrically connects the even-numbered loop patterns, The multi-band stacked helical antenna of claim 1, wherein the length of the first metal pattern portion and the length of the second metal pattern portion are different from each other so as to have a wide band resonance characteristic in a single band or a multi band resonance characteristic. The method of claim 1, The multi-band stacked helical antenna of claim 1, wherein the number of loop patterns turns between the first metal pattern part and the second metal pattern part is different so as to have resonance characteristics in different bands. The method of claim 1, Multi-band stacked helical antenna, characterized in that the number of loop pattern turns of the first metal pattern portion and the second metal pattern portion is equal to each other so as to have a wideband resonance characteristic. The method of claim 1, The dielectric body has a rectangular parallelepiped shape and is built in a top edge of a commercial terminal. The method of claim 1, And the dielectric sheet is laminated by a bonding layer formed by applying a bonding material between the dielectric sheets. The method of claim 1, A multi-band stacked helical antenna, characterized in that for forming a partition wall around the upper surface of the portion where the connection pattern is formed to prevent the inflow of bonding material. The method of claim 5, wherein The partition wall is a multi-band stacked helical antenna, characterized in that formed in a circular wall shape having a thickness of 0.5 to 1.5mm. The method of claim 1, Multi-band stacked helical antenna, characterized in that for forming a contact portion using a conductive material on the contact portion of the connection pattern and the loop pattern. The method of claim 7, wherein The conductive material of the contact portion is a multi-band stacked helical antenna, characterized in that made of any one of copper, silver, gold.

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