KR100674590B1 - Stacked dipole-loop antenna - Google Patents

Abstract

A stacked dipole-loop antenna is provided to be applied to the next generation mobile communication service and to be used for at least two mobile communication services having a large bandwidth difference. In a stacked dipole-loop antenna, a loop pattern(12) is formed in a shape of a circle. The loop pattern(12) has a partial opening angle as a horizontal pattern of a metal material on a top surface. A fine dipole pattern(14) is formed on a dielectric body(10) as a vertical pattern of a metal material. The stacked dipole-loop antenna is constructed by stacking a plurality of the dielectric bodies(10) in up and down directions. The fine dipole pattern(14) is formed inside a vertical via hole to be connected to one side end of the loop pattern(12).

Description

Stacked dipole-loop antennas {STACKED DIPOLE-LOOP ANTENNA}

1 is a partial perspective perspective view showing a stacked dipole-loop antenna according to the present invention;

2 is a partially exploded perspective view showing a laminated structure of a stacked dipole-loop antenna according to the present invention;

3 is a perspective view showing only a metal pattern of a stacked dipole-loop antenna according to the present invention;

4 is an explanatory diagram for explaining a band characteristic of a stacked dipole-loop antenna according to the present invention;

5 is a graph showing the results of the VSWR analysis for the stacked dipole-loop antenna according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10 (10-1 ~ 3): Dielectric body 12 (12-1 ~ 3): Loop pattern (horizontal pattern)

14 (14-1 ~ 3): Micro dipole pattern (vertical pattern) 16 (16-1 ~ 3-a ~ c): Vertical via hole

18: feeding line MP1 ~ 3: metal pattern

f1 ~ 3: resonant frequency

The present invention relates to a small antenna applied to a mobile communication terminal or a wireless communication terminal for transmitting and receiving an electromagnetic wave signal, and more particularly, it can be used in two or more different mobile communication service bands, and in the future, IMT- The present invention relates to a stacked dipole-loop antenna that can be used for a next-generation communication service such as 2000, and has a minimum size thereof to be built in a terminal.

In general, a small antenna applied to a mobile communication terminal includes a helical antenna formed by a spring-shaped helix protruding from the upper end of the terminal, and the helical antenna has a call regardless of the position of the terminal. It has the advantage of being possible.

The helical antenna has a physical resonant length of 1 / 2λ and 1 / 4λ using a conductive object, and a helix wound in a spiral is a main element, and a smaller antenna is required according to the recent trend of miniaturization of terminals. For miniaturization, instead of reducing the diameter of the helix and lowering the pitch, the structure should have a higher number of revolutions, but this will result in a change in the spatial radiation resistance of the electromagnetic waves and also the narrow-band antenna characteristics. However, the conventional helical antenna structure has a problem in that the reduction is limited.

Therefore, in order to miniaturize the helical antenna to be embedded in the terminal, a stacked helical antenna has been developed, and a conventional stacked helical antenna is realized by forming vertical vias and horizontal patterns using a thin dielectric sheet. As a single-band antenna, the implemented antenna is structurally exhibiting single-band characteristics, and therefore cannot be used in dual-band. In addition, the antenna is manufactured using a dielectric sheet of tens to hundreds of micrometers thick. In order to laminate the required height of 5 ~ 15㎜, it is required to go through 200 ~ 600 times of lamination process. Therefore, it takes a lot of time to manufacture. In addition, the press pattern is used in the lamination process. There were problems such as being deformed.

Therefore, an improved type of stacked helical antenna has been developed that can be manufactured by stacking vertical and horizontal metal patterns using a plurality of dielectric bodies to realize dual band and multi-band. Even with the same implementation, there was still a problem of exhibiting narrowband characteristics in the high frequency band.

For such a conventional stacked helical antenna, there is a prior art disclosed by the applicant.

Recently, various kinds of mobile communication services such as cellular, PCS, GSM, PHS and DMB services are being implemented in accordance with the rapid development of communication technology around the world, and the next generation mobile communication service, IMT-2000 service, is WCDMA. The situation is beginning with CDMA 2000.

In Korea, cellular, PCS, WCDMA, and CDMA 2000 should be provided as basic services. Therefore, there is a need to develop a wider broadband dual band antenna for PCS and IMT-2000 services. To secure double bandwidth of 120 MHz bandwidth of ~ 1,870 MHz) and 250 MHz band of IMT-2000 (1,920-2,170 MHz), the band of IMT-2000 itself is broadband and the entire band is also 420 MHz broadband of 1,750-2,170 MHz. Therefore, the implementation of the above-described antenna of the conventional type is very difficult.

That is, the above-described dual-band stacked helical antenna basically has two interconnected patterns and configures two helical antennas to implement them in multiple ways. However, the bandwidth is narrow and the efficiency of both ends of the band is reduced. It was not possible to achieve the 400 ~ 500MHz broadband required for commercialization.

The present invention was devised to solve the above problems, and it is possible to use not only the band of cellular or PCS but also the band of IMT-2000, and its size is minimized so that it is applicable to the built-in stacked dipole-loop antenna. The purpose is to provide.

In the stacked dipole-loop antenna of the present invention for achieving the above object, a vertical pattern having a partial opening angle is formed on an upper surface thereof, and a vertical via hole formed in a vertical direction therein so as to be connected to one end of the horizontal pattern. Dielectric body having a vertical pattern to be formed therein is formed in a plurality of stacked in the vertical direction, the opening angle of the horizontal pattern on each dielectric body is the narrowest of the uppermost layer and gradually increases by a predetermined angle toward the lower layer, Within the opening angle of the horizontal pattern on the dielectric body, which is located on the lower layer, the vertical patterns of all the dielectric bodies to be stacked on the upper layer are sequentially arranged at regular intervals, and thus the dielectric body of the lower layer is relatively The upper layer in addition to the vertical via hole for its vertical pattern therein The vertical via hole for forming the vertical pattern corresponding to the other dielectric body of the is also characterized in that formed sequentially arranged at a predetermined interval.

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, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partial perspective perspective view showing a stacked dipole-loop antenna according to the present invention, FIG. 2 is a partially exploded perspective view showing the laminated structure, and FIG. 3 is a perspective view showing only the metal pattern.

The stacked dipole-loop antenna according to the present invention has a cylindrical or rectangular parallelepiped shape, and a circular loop pattern 12 having a partial opening angle as a horizontal pattern of metal material is formed on an upper surface thereof. A dielectric body having a micro dipole pattern 14, which is a vertical pattern of a metal material, which is formed in a vertical via hole 16 formed in a vertical direction therein so as to be connected to one end of the 12. 10 is laminated | stacked in the predetermined number up-down direction, and is comprised.

Here, the loop pattern 12 and the micro dipole pattern 14 of each dielectric body 10 will be collectively referred to as a metal pattern MP. Commonly, the loop pattern 12 and the micro dipole pattern 14 will be referred to as one metal pattern MP. The dielectric body 10 may be formed through a plating method such as electroless plating or electroplating, and the dielectric bodies 10 may be bonded to each other through an adhesive layer coated with an adhesive material.

Here, the dielectric body 10 may be a synthetic resin epoxy substrate (FR4), a ceramic green sheet (green sheet), or a new material LTCC, etc. may be used, the metal pattern (MP) good conductivity, copper, Nickel, gold, and the like may be used, and as the adhesive material, a thermosetting material such as polypropylene (PP) may be used, and the material of the contact portion, which is a portion where the loop pattern 12 and the microdipole pattern 14 are connected to each other. As the furnace, copper, silver, gold, or the like having excellent conductivity may be used.

The opening angle of the loop pattern 12 on each dielectric body 10 is the narrowest (12-3) of the uppermost layer 10-3 and gradually increases by a predetermined angle toward the lower layer. When the dielectric bodies 10-3, 10-2, and 10-1 are laminated, they may be formed to have angles of 25 to 30 °, 50 to 60 °, and 75 to 90 °, respectively.

Accordingly, within the opening angle of the loop pattern 12 on the dielectric body 10 located in the lower layer, the corresponding micro dipole patterns 14 of all the dielectric bodies 10 to be successively stacked in the upper layer are spaced at regular intervals. In this case, vertical via holes 16 for forming the micro dipole patterns 14 corresponding to the other dielectric bodies 10 of the upper layer are also disposed in the dielectric body 10 of the lower layer. Formed.

That is, the microdipole patterns 14 of the dielectric bodies 10 to be stacked on top of the dielectric body 10 of the lower layer with the vertical via hole 16 for forming its own microdipole pattern 14. ) Is also formed along the vertical via hole 16.

In this regard, the microdipole pattern 14 of the dielectric body 10 of the n-th layer is formed to have a length corresponding to the sum of the heights of the dielectric body 10 of the layer and its lower layers.

In addition, a normal feeding line 18 is appropriately formed on the lower surface of the lowermost dielectric body 10-1, and each of the layers 10-1, 10-2, 10 is provided on the feeding line 18. The lower ends of the micro dipole patterns 14-1, 14-2, and 14-3 of -3) form a connection, and a connector for connecting to the terminal side is connected to the feeding line 18, although not shown. Will be.

Therefore, the metal patterns MP1, MP2, and MP3 of each of the dielectric bodies 10-1, 10-2, and 10-3 are not connected to each other and are connected to only the feeding line 18 independently.

Here, as an example, a case in which three dielectric bodies 10-1, 10-2, and 10-3 are stacked will be representatively referred to as first, second, and third sequentially from those corresponding to the lowest layer. Shall be.

According to the present invention, each of the provided metal patterns MP1, MP2, and MP3 resonates at their resonant frequencies, that is, as shown in FIG. 4, the center frequency induced by the first metal pattern MP1, f1. Is resonated at a lower frequency, the center frequency induced by the second metal pattern MP2, f2 is resonated at an intermediate frequency, and the center frequency f3 induced by the third metal pattern MP3 is resonated at an upper frequency. It has a VSWR (Voltage Standing Wave Ratio) curve.

Therefore, if the resonance frequencies (f1, f2, f3) of each of the triple metal patterns (MP1, MP2, MP3) are narrowly narrowed, the resulting VSWR is expressed as a result of a wide band characteristic. Characteristics.

Here, the resonance characteristics of each of the metal patterns MP1, MP2, and MP3 are changed by the physical length of the corresponding conductor (that is, the metal pattern itself). Therefore, by adjusting the physical length of each conductor appropriately, each resonance frequency f1 is adjusted. By adjusting the separation frequency between the f2, f3, it is possible to exhibit a wideband resonance characteristic.

For reference, the physical length Ln of the nth metal pattern MPn is D for the diameter of the corresponding loop pattern 12, OA for the open angle of the corresponding loop pattern 12, and a corresponding microdipole. When the length of the pattern 14 is called Pn, it may be expressed as Equation 1 below.

Therefore, triple resonance characteristics are represented by L1, L2, and L3 of the triple metal patterns MP1, MP2, and MP3, and the separation frequency between the resonance frequencies f1, f2, and f3 is adjusted by adjusting the physical length. By doing so, the resonance characteristics of the broadband can be obtained.

The stacked dipole-loop antenna according to the present invention has a structure in which each dipole-loop antenna has a structure similar to that of a conventional omnidirectional vertical monopole antenna. Polarization and horizontal polarization can be efficiently transmitted and received simultaneously.

And, by stacking a plurality of horizontal pattern dielectric sheets and a plurality of vertical pattern dielectric sheets and interconnecting metal patterns, only three to five dielectric bodies (only three to five helical antennas) are implemented. 10) only the lamination, but the metal pattern (MP) of each of the dielectric body 10 is not connected to each other, it can be manufactured through a simple process of simple lamination, the productivity is high, and also the number of uses of the dielectric body 10 The manufacturing cost can be reduced according to the saving, etc., and also excellent in the structure efficiency.

For reference, the stacked dipole-loop antenna according to the present invention is based on a terminal applied simultaneously to PCS and IMT-2000 or CDMA and IMT-2000, and dielectric of three layers of epoxy substrate (FR4) based on 500 MHz bandwidth. When the body 10 is laminated, it can be manufactured in a size of about 8 ~ 10mm in height of 5Φ, and when only the entire GSM / DCS / WCDMA is implemented in a wide band, only four dielectric bodies 10 are laminated and 6mm in width and 6mm in length. × 12mm in height reveals that it can be manufactured very small.

On the other hand, Figure 5 is a graph showing the results of the VSWR analysis for a stacked dipole-loop antenna according to the present invention.

The result of the analysis is that the antenna is stacked in three layers, having a diameter of 6Φ and a height of 9.6 mm. The dielectric body 10 is made of FR4, and the metal pattern (MP) is made of copper, nickel, and gold. Manufactured by measuring a return loss with respect to frequency using a conventional network analyzer. When the reference point of the return loss is set to -9.54 dB or less with "VSWR <2", the test result is As a result, the bandwidth was found to be about 575MHz, which is very broadband.

As a result, as described above, it can have a bandwidth of 450 to 500 MHz or more, so that it can be applied to various mobile communication services, but can also be used as a multi-band as necessary, and its size is minimized to be embedded in the terminal. It will be possible.

In addition, the circular pattern having a partial opening angle as a horizontal pattern is represented as above, but the shape of a meander line having a separation space or other open squares or a connecting grid pattern shape as other shapes according to the use of the antenna. It may be used, etc., it can be made up of a plurality of vertical patterns 14 without the horizontal pattern 12, depending on the purpose of the frequency.

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

According to the present invention, it is possible to easily implement a broadband to be applied to a next-generation mobile communication service with a wide bandwidth, and can be effectively used for two or more different mobile communication services having a large bandwidth difference, and the size thereof is minimized. Many effects can be achieved, such as being internally embedded.

Claims (4)

A plurality of dielectric bodies having a vertical pattern formed on the upper surface and having a vertical pattern formed in a vertical via hole formed in a vertical direction therein so as to be connected to one end of the horizontal pattern are formed in the vertical pattern. Are stacked and The opening angle of the horizontal pattern on each dielectric body is the narrowest at the top layer and gradually increases by a predetermined angle toward the lower layer. In the opening angle of the horizontal pattern on the dielectric body relatively located in the lower layer, the vertical patterns of all the dielectric bodies to be stacked in the upper layer are sequentially arranged at regular intervals, Accordingly, in the dielectric body of the lower layer, in addition to the vertical via hole for the vertical pattern of the lower layer, vertical via holes for forming the vertical pattern corresponding to the other dielectric body of the upper layer are sequentially arranged at regular intervals. Stacked dipole-loop antenna, characterized in that. The method of claim 1, And a feeding line is formed on the lower surface of the dielectric body of the lowermost layer so that the lower end of the vertical pattern of each layer is connected. The method according to claim 1 or 2, The horizontal pattern, A stacked dipole-loop antenna comprising a circular shape having an open angle, a meander line shape having a separation space, a rectangular shape having an open angle, or a connecting grid pattern. The method according to claim 1 or 2, The horizontal pattern and the vertical pattern is formed by plating on the dielectric body, Stacked dipole-loop antenna, characterized in that the dielectric body is bonded through the adhesive layer.

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