KR100988480B1 - Stacked Antenna - Google Patents

Abstract

The present invention is a multi-stage antenna structure provided to receive a DMB in a portable terminal, unlike the conventional multi-stage antenna to shorten the physical length of the entire antenna when each stage is drawn out for signal reception, the first stage road; At least one second rod inserted into the first rod and fixed to the upper end of the first rod; And at least one third rod disposed between the first rod and the second rod and withdrawn from the first rod or drawn into the first rod in connection with the second rod. By being arranged, the electrical length of the antenna can be kept constant while the physical length can be significantly shortened compared to the conventional one.

Rod, helix, stage, antenna, terrestrial, dmb

Description

Multistage Antenna

The present invention relates to a multi-stage antenna, and more particularly, to a multi-stage antenna to reduce the size of the antenna by reducing the physical length constituting the antenna than the electrical length of the antenna required for wireless signal transmission and reception will be.

Recently, portable terminals such as navigation terminals including mobile phones, PMPs, and the like, are being spread to include digital multimedia broadcasting (DMB) in addition to unique functions provided by each terminal.

DMB broadcasting is divided into satellite DMB and terrestrial DMB (Terrestrial DMB). Terrestrial DMB receives data through a VHF band having a bandwidth of about 1.5 MHz, and in Korea, it is widely used because no additional fee is charged.

In order to receive such terrestrial DMB, a predetermined antenna is provided in the portable terminal. In general, the antenna length may be obtained by an electrical length corresponding to 1/4 (λ / 4) of a signal wavelength to be received, and the electrical length and the physical length of the actually implemented antenna have a relatively same value. However, the terrestrial DMB uses a VHF-class channel with a low frequency, so the physical length of the antenna is very long, and thus it is inconvenient to carry or store the portable terminal in which the antenna is mounted.

1 is a block diagram showing a configuration of a multi-stage antenna according to the prior art, a three-stage rod antenna is shown. FIG. 1 (a) is a block diagram showing the antenna in the state where each end of the antenna is drawn in, and FIG. 1 (b) is a block diagram showing the antenna in the state where all the ends of the antenna are drawn out.

The multi-stage antenna according to the prior art is to compensate for the above-mentioned disadvantages and connect rods of rod-shaped metal body (rod) in several stages and, if necessary, draw out each rod to extend its length.

In more detail, the multi-stage antenna according to the prior art, as shown in Figure 1 (a), is connected to the portable terminal for transmitting a signal (1), the antenna portion (2) a plurality of rods overlap, and Head portion (3).

As shown in FIG. 1 (b), a plurality of rods 2a, 2b, and 2c are overlapped and inserted into the antenna unit 2, and the lower end of the rod to be disposed on the upper side and the upper end of the rod to be disposed on the lower portion thereof. Connected in this order, the connecting member (4a, 4b) is provided at the lower end of the other rods, except for the lowermost rod connecting the connecting portion (1) and electrically connected to the other rods, respectively.

Therefore, when the rods superimposed in the antenna portion 2 are sequentially drawn out, the rods 2b and 2c that are inserted in the rods in turn are drawn out from the rods 2a disposed at the outermost side and connected to the head portion 3. do. In addition, the signal received through the open point, which is the final end of the electrical connection of the antenna 5, is transmitted downward along each connected rod and is transmitted to the main board of the portable terminal equipped with the antenna 5.

In this case, the total length of the antenna unit is a value obtained by adding up the lengths of the stage rods as shown in FIG. 1 (b). In general, the length is a length obtained by multiplying the number of rods provided by the length of each stage rod, that is, L ( Folded length) X 3 (number of rods), and corresponds to the electrical length (λ / 4) required for resonance of the antenna 5.

FIG. 2 is a structural diagram illustrating a structure of a multistage antenna according to another exemplary embodiment of the prior art, and illustrates a multistage antenna when one of a plurality of rods is replaced with a helix antenna.

That is, in another embodiment of the prior art, in order to reduce the physical length of the antenna while receiving a signal having a constant resonant frequency normally, as shown in FIG. 2, a rod to be disposed at the top of each stage rod constituting the multi-stage antenna. Can be replaced by a helix antenna. The helix antenna is a metal wire wound in the form of a screw. When the antenna is implemented with the same length of metal wire, its length is reduced.

As an example of configuring a three-stage antenna similar to the above-described case of FIG. 1, in the multi-stage antenna 10, a first rod 9a is disposed in a helix antenna 8 connected to a head, and the first rod The second rod 9b is disposed in 9a. In addition, when the antenna stages are drawn out, the first rod 9a drawn in the helix antenna 8 is drawn out to connect the lower end of the helix antenna 8 and the upper end of the first rod 9a. The lower end of the first rod 9a and the upper end of the second rod 9b are connected while the second rod 9b drawn in the 9a is drawn out of the first rod 9a. At this time, the electrical length of the antenna 10 is the sum of the length of the first rod, the length of the second rod and the length of the metal wire constituting the helix antenna, the physical length is the length of the helix antenna, Length plus the length of the second rod.

The present invention proposes a multi-stage antenna in which a multi-stage antenna structure provided for receiving a DMB in a portable terminal can shorten the physical length of the entire antenna when all stages are drawn out for signal reception as compared with the prior art.

More specifically, the multi-stage antenna according to an embodiment of the present invention comprises a first rod; At least one second rod inserted into the first rod and fixed to the upper end of the first rod; And at least one third rod disposed between the first rod and the second rod and withdrawn from the first rod or drawn into the first rod in connection with the second rod. By arranging, the electrical length of the antenna can be kept constant while the physical length can be greatly shortened compared to the conventional one, so that the antenna can be conveniently used for watching DMB.

In addition, the multi-stage antenna according to an embodiment of the present invention includes a helix antenna embedded in the antenna housing (housing); A first rod connected to an upper end of the helix antenna and disposed inward; And a second rod disposed between the helix antenna and the first rod, the second rod being connected to the first rod and drawn out or drawn in from the antenna housing, thereby allowing the antenna end stage to be disposed downward. The physical length of the antenna can be shortened more than that of the case, and the space can be greatly secured compared to the conventional case when the antenna is embedded in the portable terminal.

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

First, in the present specification, a multi-stage antenna according to an embodiment of the present invention will be described as an example of a multi-stage antenna including two rods or three rods, but the present invention is not limited thereto and may be applied to a multi-stage antenna including four or more stages. Specifies.

3 is a structural diagram showing the structure of a three-stage antenna of the multi-stage antenna according to the first embodiment of the present invention, Figure 3 (a) is a multi-stage antenna according to the first embodiment of the present invention, each stage is all FIG. 3 (b) is a diagram illustrating a multi-stage antenna structure with all stages drawn out. FIG.

The multi-stage antenna 100 according to the first embodiment of the present invention, as shown in Fig. 3 (a), includes a head portion, an antenna portion, a connecting portion, the antenna portion is inserted into each end in turn in order to overlap Can be. At this time, the multi-stage antenna 100 according to the present invention has a structure in which a part of the rod is fixed in the inserted state.

Hereinafter, for convenience of description, the rod disposed at the outermost portion is the first rod 20, the rod inserted therein is fixed to the second rod 30, and the rod capable of drawing / drawing is transferred to the third rod 40. It describes by reference.

The second rod 30 and the third rod 40 are inserted into and disposed in the first rod 20, and the second rod 30 is fixedly connected to the first rod 20 and the head portion, and the third rod 30 is inserted into the first rod 20. The rod 40 is spaced apart from the second rod 30 at a predetermined interval to surround the second rod 30.

Accordingly, the antenna 100 may be arranged in the order of the first rod 20-the third rod 40-the second rod 30 from the outside, as shown in FIG. However, when a force is applied to withdraw the rod, the second rod 30 is fixed in the first rod 20, and thus only the third rod 40 is pulled out of the first rod 40 without being drawn out.

Since the third rod 40 is larger in diameter than the second rod 30 and is arranged to surround the second rod 30, the third rod 40 is not pulled out so as to be completely separated from the second rod 30. Predetermined locking piece is provided at the bottom of the second rod (30).

On the electrical side of the antenna 100, assuming that a predetermined signal is emitted to the outside via the connection, the signals are transmitted in the order of the third rod 40-the second rod 30-the first rod 20. The end of the first rod 20 may be a final end (open point) for transmitting and receiving a signal. In this case, unlike the conventional antenna structure formed near the top of the antenna, the position of the final stage is disposed near the connecting portion of the second rod 30 and the third rod 40, which is conventionally the second rod at the bottom of the first rod. Although the top of is connected, in one embodiment of the present invention because the top of the first rod is connected to the top of the second rod because the signal flow in the first rod is downward.

That is, when each rod is drawn out, the first rod 20 and the second rod 30 are connected to form the first connection point 25 at the upper end of the first rod 20, and the second rod 30 and the first rod 20 are connected to each other. The three rods 40 form a second connection point 35 at the bottom of the second rod 30 and are electrically connected to each other.

When the antenna stages are drawn out, the electrical length of the antenna becomes the sum of the lengths of the rods, that is, the length of the first rod + the length of the second rod + the length of the third rod, but the physical length is The length of one rod + the length of the third rod + α has a length value in a range similar to that of the conventional two-stage antenna. Therefore, while the electrical length for receiving a signal of a predetermined frequency band is the same, the physical length can be obtained a relatively large reduction compared to the conventional.

On the other hand, the open point of the antenna is disposed near the point where the second rod 30 and the third rod 40 is connected, when the contact with the second rod 30 or the third rod 40 is made of the antenna 100 The electrical length of the sum of the length of the second rod and the length of the third rod is difficult to receive a signal of the desired frequency band. Therefore, an insulator 50 may be disposed between the first rod and the second rod to prevent contact, and the insulator 50 may be disposed on some or all of the inner surface of the first rod corresponding to the periphery where the open point is located. Unexpected rod-to-rod contact can be prevented.

On the other hand, the second rod 30 and the third rod 40 can change the size of each other, the diameter of the second rod is larger than the diameter of the first rod and the diameter of the second rod is If smaller than the diameter is possible.

4 is an exemplary view illustrating a modified structure in a multistage antenna according to a first embodiment of the present invention.

In the multi-stage antenna 100 ′ according to the first embodiment of the present invention, the diameters of the second rod 30 ′ and the third rod 40 ′ can be adjusted, as shown in FIG. 3. The diameter of the third rod 40 is larger than the diameter of 30 so that it may be formed to surround the second rod 30 when drawn into the first rod 20, the second rod as shown in FIG. The diameter of 30 'is greater than the diameter of third rod 40' so that third rod 40 'may be inserted into second rod 30'.

The rod constituting each end may be a metal pipe or wire, the first rod (20, 20 ') disposed on the outermost side to maintain the antenna shape by applying a metal pipe Can also serve. Also for the second rod and the third rod, apply a metal pipe as the second rod 30 'and apply the wire to the third rod 40' or apply the wire as the second rod 30 and the third As the rod 40, a metal pipe can be applied. In this case, since each rod is a method in which one rod is inserted into the other rod, at least one rod is preferably in the shape of a pipe in which a hollow is formed. As the material of the wire, a Ni-Ti alloy used as a shape memory alloy is preferably used. Do.

5 is a structural diagram showing the structure of a multi-stage antenna according to a second embodiment of the present invention, a multi-stage antenna structure having a helix antenna at the top.

The multi-stage antenna according to the second embodiment of the present invention is a two-stage antenna composed of one rod and one helix antenna as shown in FIG.

That is, the multi-stage antenna 200 according to the second embodiment of the present invention includes a helix antenna 220, a rod 240, and an antenna housing 210 surrounding and protecting the helix antenna as shown in FIG. . The rod 240 is inserted into the hollow formed by the helix antenna 220 and connected to the top of the helix antenna 220. Accordingly, the final stage (open point) of the helix antenna 220 is disposed downward, and is positioned at a position corresponding to the middle point of the rod 240. The signal received through the open point is transmitted along the metal wire constituting the helix antenna 220. In addition, it is transmitted to the rod 240 through the connection point 250 with the rod 240 formed on the top of the helix antenna 220. Therefore, the electrical length of the antenna 200 required for signal transmission and resonance may correspond to the metal wire length of the helix antenna 220 plus the length of the rod 240, whereas the physical length is the load ( Corresponding to the length of 240, the physical length is shorter than the electrical length.

In addition, as described above, the conductor rod 240 is disposed through the center portion of the helix antenna 220, and as the open point is positioned at the midpoint of the rod 220, a part or the open point of the helix antenna 220 is defined as the rod 240. There is a possibility of shorting in contact with the () may be insulated 230 between them to prevent this. In this case, the insulator 230 is formed in a pipe shape so that the helix antenna 220 can be wound on the outer surface of the insulator 230 or applied to the outer surface of the rod 240, and at a position other than the connection point 250 with the rod according to the producer. Various methods can be applied to prevent contact with each other.

6 is a structural diagram illustrating a structure of a multi-stage antenna according to a third embodiment of the present invention, and shows a structure of a three-stage antenna including a helix antenna.

The multi-stage antenna 300 according to the third embodiment of the present invention is a modification of the multi-stage antenna structure 200 shown in FIG. 5 and includes a helix antenna 320 and two rod antennas 340 and 350. At this time, the helix antenna 320 is accommodated by the antenna housing 310, the first rod 340 is inserted through the hollow formed by the helix antenna 320 is applied to the metal wire and the helix antenna 320 Connected and fixed. The second rod 350 is disposed to surround the first rod 340, which is a metal wire by applying a metal pipe, and may be connected at the lower end of the first rod 340 when taken out.

The multi-stage antenna according to the third embodiment of the present invention also forms a first connection point 325 at the upper end of the helix antenna 320 and the first rod 340, as described above, when all the antenna stages are drawn out, A second connection point 345 may be formed at a lower end of the first rod 340 and an upper end of the second rod 350 to transmit a signal.

Therefore, the electrical length of the multi-stage antenna may correspond to the length of the first rod + the length of the second rod + the length of the helix antenna, but the physical length may correspond to the length of the second rod + the length of the helix antenna + α. As a result, the physical length is shorter than the electrical length, and the antenna having a shorter length than the electrical length required for resonance can be realized.

7 is a diagram illustrating a modified structure in the multi-stage antenna according to the third embodiment of the present invention. When the metal pipe is applied to the first rod and the metal wire is applied to the second rod, FIG. It is an exemplary view shown.

As described above, in the multi-stage antenna according to the embodiment of the present invention, the rods disposed inside the helix antenna except for the rod disposed at the outermost portion may have their diameters changed according to the connection structure, as shown in FIG. 7. As described above, the diameter of the first rod 340 'connected to and fixed to the helix antenna 320' is larger than the diameter of the retractable second rod 350 'so that the second rod 350' It may have a structure drawn into the first rod 340 ′ and drawn out from the first rod 340 ′.

As described above, the multi-stage antenna according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited to the embodiments and drawings disclosed herein, and the antenna is fixed by fixing some stages constituting the antenna in an inserted state. It is apparent that the technical idea of the present invention, which can shorten the physical length and thereby improve the portability of the portable terminal equipped with the antenna, can be easily applied by those skilled in the art within the scope of protection.

1 is a structural diagram showing a structure of a multi-stage antenna according to an embodiment of the prior art,

2 is a structural diagram showing a structure of a multi-stage antenna according to another embodiment of the prior art;

3 is a structural diagram showing a structure of a multistage antenna according to a first embodiment of the present invention;

4 is an exemplary diagram illustrating a modified structure in a multi-stage antenna according to a first embodiment of the present invention;

5 is a structural diagram showing the structure of a multi-stage antenna according to a second embodiment of the present invention;

6 is a structural diagram showing a structure of a multistage antenna according to a third embodiment of the present invention; and

7 is an exemplary diagram illustrating a modified structure in a multi-stage antenna according to a third embodiment of the present invention.

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

100, 100 ', 200, 300, 300': multi-stage antenna

20, 20 ', 240, 340, 340': first rod

50, 50 ', 230, 330, 330': insulator

30, 30 ', 350, 350': second rod

210, 310, 310 ': antenna housing 220, 320, 320': helix antenna

40, 40 ': 3rd rod

Claims (9)

A first rod; At least one second rod inserted into the first rod and fixedly connected to an upper end of the first rod; And At least one or more third rods disposed between the first rods and the second rods and drawn from or drawn into the first rods with one end connected to the second rods Including, the multi-stage antenna to be arranged the antenna end stage down. The method of claim 1, And an insulator disposed between the first rod and the third rod to prevent the first rod and the third rod from being directly connected. The method of claim 2, The insulator is disposed in part or all of the first rod inner surface corresponding to the point where the second and third rods are connected. The method of claim 1, The first rod is a wire of Ni-Ti material, the third rod is a multi-stage antenna of the metal pipe shape. The method of claim 1, The first rod has a metal pipe shape, and the third rod is a Ni-Ti wire. A helix antenna embedded in the antenna housing; A first rod fixedly connected to an upper end of the helix antenna and disposed inside the helix antenna; And A second rod disposed between the helix antenna and the first rod and connected to the first rod and drawn from or drawn into the antenna housing; Including a multi-stage antenna, such that the antenna end stage is disposed downward. The method of claim 6, And an insulator disposed between the helix antenna and the second rod. The method of claim 6, The first rod is a Ni-Ti wire, the second rod is a multi-stage antenna of a metal pipe. The method of claim 6, The first rod is a metal pipe, and the second rod is a Ni-Ti wire.

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