KR20080075332A - Multiband imbedded antenna for tele-communicating terminal and method for manufacturing the same - Google Patents

Abstract

A multi-band embedded antenna for a telecommunication terminal and a method for manufacturing the same are provided to obtain products with a uniform dimension by using a PCB method. A multi-band embedded antenna for a telecommunication terminal includes a first antenna(20a), a second antenna(20b), a phase delay power feed line(40), and a feed terminal part(50). The first antenna and the second antenna are implemented by a plurality of horizontal fine loop antennas(24a-24f) and a plurality of vertical fine dipole antennas(22a-22f), which are directly connected to each other. The phase delay power feed line parallel connect a resonance frequency of the first antenna to a resonance frequency of the second antenna. The feed terminal part is disposed at one side of the phase delay power feed line.

Description

MULTIBAND IMBEDDED ANTENNA FOR TELE-COMMUNICATING TERMINAL AND METHOD FOR MANUFACTURING THE SAME}

1 is a front view showing a helix used in a general helical antenna as a built-in antenna for a mobile communication terminal,

2 and 3 are one side perspective view and a front perspective view of an opposing surface showing a multi-band internal antenna for a mobile communication terminal according to an embodiment of the present invention,

4 is a front view of FIG. 3,

5 is a diagram for explaining formation of an interlayer magnetic field of the built-in antenna of the present invention;

6 is a diagram for explaining the interlayer conduction method of the built-in antenna of the present invention,

7 is a VSWR characteristic diagram of a built-in antenna of the present invention;

8 and 9 are diagrams showing the radiation pattern and the efficiency of the built-in antenna of the present invention.

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

20a, 20b: first and second antennas 22a-22f: vertical micro dipole antenna

24a-24f: horizontal micro loop antenna 23, 25: longitudinal section

30: thermosetting resin layer 32: through hole

40: phase delay feed line 50: feed terminal unit

The present invention relates to a multi-band internal antenna for a mobile communication terminal and a method of manufacturing the same. More specifically, each conductive circuit and feed terminals of a plurality of antennas are formed in an integrated process using a PCB process, thereby providing a single feed. A multiband internal antenna for a mobile communication terminal, which can be connected to a dot, but can arrange a plurality of antennas resonating at different frequencies in close proximity to each other to realize a wide band of antennas using a mutual interference effect between the antennas; It relates to a manufacturing method.

In general, a helicla antenna is used for a portable mobile communication terminal, and it is classified into a stubby and a retractable type, and both physical resonance lengths of 1/2 and 1 / 4λ are made by using a conductive object. It is wound spirally, and has a ground plane and a feeder. A helical shape conductive coil existing therein is called a helix.

1 shows a multi band dual band type helix. As shown, in each area, the pitch of the helix 10 made of conductive metal steel wire is formed into different spiral structures with the first pitch 12 and the second pitch 14 to obtain a multi-band. Since the L and C values of the LC resonant circuit are varied, the LC resonant block operates as an antenna for multiband resonance.

The conventional helical antenna is formed by applying a pull and pressure in the coil forming machine using a steel wire material of a constant wire diameter, and the deformation caused by the elasticity of the steel wire occurs in this forming process, thereby obtaining a product of a uniform standard It becomes impossible.

In addition, heat treatment is performed in the post-treatment process, which inevitably entails thermal deformation of the metal in the course of the heat treatment process, and this thermal deformation causes a problem of instability of the antenna.

In addition, it is inevitably accompanied by the post process of fastening the helix part of the antenna and the feeding part of the antenna. In such a post process, the frequency instability of the product depends on the deformation of the helix and the degree of coupling of the feed metal part according to the worker's working method. Factor, which is another factor in increasing the failure rate of the product.

In addition, as a post process for fixing the pitch of the helix, the appearance of the product is formed by extrusion molding using a dielectric resin, where the fluid resin flows at high pressure and high speed, causing a helix pitch deformation. In addition, since there is a factor of the characteristic instability of the product, there is a problem that is a factor that reduces the performance of the antenna.

The present invention has been made to solve the above problems, the object of the present invention is to implement a circuit shape of the antenna by forming each conductive circuit and the feed terminal of the plurality of antennas in an integrated process using a PCB process, one feed A multiband internal antenna for a mobile communication terminal, which can be connected to a dot, but can arrange a plurality of antennas resonating at different frequencies in close proximity to each other to realize a wide band of antennas using a mutual interference effect between the antennas; It is to provide a manufacturing method.

As a means for achieving the above object, the multiband internal antenna for a mobile communication terminal of the present invention has a multiband resonant characteristic, each of which is connected to a series of serial connections of a plurality of vertical microdipoles and a plurality of horizontal microloop antennas. A first and second antennas implemented by the first and second antennas, a phase delay feed line for connecting the antennas in parallel, and a feed terminal unit disposed on one side of the phase delay feed line, wherein each circuit includes a plurality of micro loop antennas. In this case, the magnetic field caused by the current flowing through each conductor is induced to cancel each other by making the direction of the current flowing through the respective conductors of the odd-numbered microloop antennas and the direction of the current flowing through the respective conductors of the even-numbered microloop antennas face each other. It features.

In addition, the method of manufacturing a multi-band internal antenna for a mobile communication terminal of the present invention by repeating the step of connecting the end surface of the micro dipole antenna and the end surface of the micro loop antenna to one dielectric sheet, Implementing a physical electrical circuit of each of the first and second antennas implemented as a composite, inserting a thermosetting resin layer having a through hole between the dielectric sheets to adhere each of the dielectric sheets; In this way, by applying a predetermined pressure in the state where the thermosetting resin layers are stacked between the dielectric sheets, the air is generated by depressurization with a vacuum pump while adhering the end surface of the micro dipole antenna and the end surface of the micro loop antenna to remove air bubbles. It characterized in that it comprises a step of preventing.

According to the present invention, since the electrical circuit portion and the power supply portion of the plurality of antennas are manufactured and manufactured integrally, the conventional instability factor by manual operation is eliminated, and the first antenna, the second antenna, and the phase delay circuit portion are used for wideband. By implementing the multi-band antenna of the antenna has the effect of improving the characteristics of the existing helix antenna, and obtain a multi-band internal antenna that is cheaper and maximizes yield.

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.

2 and 3 illustrate a multi-band internal antenna for a mobile communication terminal according to an embodiment of the present invention. As shown, in the multi-band internal antenna for a mobile communication terminal of the present invention, the first antenna 20a and the second antenna 20b are connected in parallel by using a phase delay feed line 40, and a feed terminal unit is formed at one side thereof. 50 is mounted.

Each of the first antenna 20a and the second antenna 20b has both a plurality of vertical micro dipoles 22a-22f and a plurality of horizontal micro loop antennas 24a-24f having a constant open angle. The termination is realized by a serial connection with the micro dipole antenna, and the first and second antennas 20a and 20b basically have a multiband resonance characteristic. That is, the physical resonant lengths of the first and second antennas 20a and 20b determine the resonant frequencies of the respective antennas, and the resonant frequency of the first antenna 20a and the resonant frequency of the second antenna 20b. Are physically adjacent, and are connected in parallel by the phase delay feed line 40. The antenna configured as described above has a wider resonance characteristic than the respective resonance characteristics of the first and second antennas 20a and 20b due to the resonance characteristics of the first antenna 20a and the second antenna 20b. The antenna is realized.

On the other hand, in constructing the circuit of the antenna, as in the direction of the arrow shown in Fig. 5, the direction of the current flowing in each of the first, third and fifth micro loop antennas 24a, 24c and 24e is half While the current flows in the clockwise direction, the direction of the current flowing through the conductors of the second, fourth, and sixth minute loop antennas 24b, 24d, and 24f flows in the clockwise direction, and the magnetic field caused by the current flowing through the conductors cancels each other. Induced so as to reduce the interference coefficient between the antenna layers.

The built-in antenna of the present invention as described above is manufactured as follows.

6 shows only the first antenna 20a as an example, and as shown therein, it is embodied as a composite of the micro dipole antenna 22 and the micro loop antenna 24 in one dielectric sheet 21, these composites. First, the process of connecting the longitudinal section 23 of the micro dipole antenna 22 and the longitudinal cross section 25 of the micro loop antenna 24 is performed, and the first and second antennas are repeated. The physical electrical circuit of the antenna is implemented. At this time, the thermosetting resin layer 30 having the through hole 32 is inserted between the dielectric sheets 21 to bond the respective dielectric sheets 21.

By applying a predetermined pressure in the stacked state as described above, the end face 23 of the micro dipole antenna 22 and the end face 25 of the micro loop antenna 24 are brought into close contact with each other through the through hole 32. By depressurizing to remove all air, bubbles are prevented from occurring during the bonding process. When bubbles are generated, a change in the effective dielectric constant of the antenna is caused, which results in a deviation in the characteristics of the antenna. In addition, a sufficient adhesive effect cannot be obtained.

In addition, the through-hole 32 formed in the thermosetting resin layer 30 is formed of the longitudinal section 23 of the micro dipole antenna 22 and the micro loop antenna 24 when the thermosetting resin layer 30 receives heat and becomes fluid. The film is formed in a portion where the end surface 25 is in close contact with each other so as to prevent electrical disconnection.

7 to 9, the VSWR (Voltage Standing Wave Ratio) characteristics, the radiation pattern and the efficiency of the built-in antenna of the present invention using the above PCB method are shown, respectively.

As shown, the multi-band internal antenna for a mobile communication terminal using a plurality of antennas according to the present invention can obtain the characteristics of the multi-band, in particular the mobile communication terminal as a radiation pattern showing the radiation characteristics shown in FIG. It is shown to satisfy the omni-directional characteristic.

As described above, the multi-band internal antenna for a mobile communication terminal using the plurality of antennas according to the present invention and a method of manufacturing the same simplify a manufacturing process, thereby enabling mass production. In addition, since the PCB method is used, a product having a uniform dimensional specification can be obtained, and thus a stable characteristic can be obtained even in the resonance characteristic of the product. This has the effect of increasing stability in the characteristics of the built-in antenna for a mobile communication terminal.

Claims (4)

In the multi-band internal antenna for a mobile communication terminal, First and second antennas, each of which is implemented by successive serial connection of a plurality of vertical micro dipoles and a plurality of horizontal micro loop antennas to have a multiband resonance characteristic, A phase delay feed line connecting the antennas in parallel; It includes a feed terminal unit mounted on one side of the phase delay feed line, The circuits of the respective antennas flow in the respective conducting wires by making the direction of the current flowing in each conducting wire of the odd number of micro loop antennas and the direction of the current flowing in each conducting wire of the even number of micro loop antennas opposite to each other. Characterized in that the magnetic field by the current is induced to cancel each other Multiband internal antenna for mobile communication terminal. The method of claim 1, The micro loop antenna has a constant open angle, and both ends thereof are connected in series with the micro dipole antenna. Multiband internal antenna for mobile communication terminal. In the manufacturing method of a multi-band internal antenna for a mobile communication terminal, Repeating the process of connecting the end faces of the micro dipole antenna and the end faces of the micro loop antenna to one dielectric sheet, the physical electrical circuits of the first and second antennas respectively implemented as a complex of the micro dipole antenna and the micro loop antenna are implemented. Implementing the Inserting a thermosetting resin layer having a through hole between the dielectric sheets to adhere each of the dielectric sheets; In this way, by applying a predetermined pressure in the state where the thermosetting resin layers are stacked between the dielectric sheets, the air is generated by depressurization with a vacuum pump while adhering the end surface of the micro dipole antenna and the end surface of the micro loop antenna to remove air bubbles. Characterized in that it comprises a step of preventing Method of manufacturing a multiband internal antenna for a mobile communication terminal. The method of claim 3, wherein The longitudinal cross section of the micro dipole antenna and the longitudinal cross section of the micro loop antenna are in close contact with each other through through holes formed in the dielectric sheet. Method of manufacturing a multiband internal antenna for a mobile communication terminal.

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