KR101510837B1 - A flexible variable length multi-step rod antenna - Google Patents

Abstract

The present invention relates to a flexible variable length multi-step rod antenna. A flexible variable length multi-step rod antenna according to an embodiment of the present invention includes: a multi-step metal rod; and a slit formed on the metal rod. The present invention can make the rod antenna be flexible by forming the slit on the rod antenna, and at the same time, can widen the bandwidth of the antenna and also can make the rod antenna be used in multi bands.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a flexible multi-

Field of the Invention [0002] The present invention relates to an antenna, and more particularly, to a variable length rod antenna that can be bent.

A wireless terminal equipped with a function of receiving a digital multimedia broadcasting (DMB) while a multimedia transmission / reception function is added to a wireless terminal in addition to functions such as voice communication and text message has been developed and distributed.

Digital multimedia broadcasting is divided into satellite digital multimedia broadcasting and terrestrial digital multimedia broadcasting. Of these, terrestrial digital multimedia broadcasting uses a low frequency band of VHF band (for example, 170 to 210 MHz). In order to receive such a frequency band, a long antenna is required. When the antenna is built in, the volume occupied by the antenna in the wireless terminal becomes large. Therefore, the volume of the antenna in the wireless terminal is reduced, A rod antenna capable of securing the antenna is mainly used.

With the recent introduction of curved smartphone terminals, it is required to cope with such a structure in various fields such as a screen, a battery, and a device. In the field of antennas receiving broadcasts, rod antennas, which use a plurality of metal pipes having a plurality of different diameters in a continuous multi-stage connection, have been widely used at various frequencies such as AM / FM, DMB and DTV. So that it is difficult to be inserted into the bent smart phone terminal. Therefore, it is necessary to develop an antenna that can be inserted and bent while the antenna is bent, and the performance of the antenna is not lower than that of the conventional antenna.

In this regard, Korean Patent Laid-Open No. 2010-0129411 (Applicant: Menix Co., Ltd.) discloses a "dual band detachable antenna ". Korean Patent Publication No. 2010-0129411 discloses a wireless communication system including a matching post for receiving external radio waves through a rod antenna and a helical coil and elastically inserting and ejecting a stepped portion of the rod antenna, Band detachable antenna. Korean Patent Laid-Open Publication No. 2010-0129411 discloses a hinge module comprising a plug electrically connected to a terminal, a hinge module having a plug at one end and an elastic member at the other end, a hollow housing for receiving the other end of the hinge module, A first rod antenna disposed at the lowermost one of the antenna sections, and a second rod antenna disposed at a lower end of the antenna section for receiving external radio waves through first and second rod antennas, A rod mount coupled to an upper portion of the housing and having an elastic piece for supporting the antenna portion therein; and a rod mount which surrounds the outer periphery of the sleeve, A dual band detachable antenna including a helical coil connected to an antenna is disclosed. Accordingly, Korean Patent Laid-Open No. 2010-0129411 has an effect that the length of the antenna can be conveniently matched according to the frequency band of the service to be used by the terminal, by adjusting the extension length of the antenna portion by the insertion force of the matching post.

As described above, Korean Patent Laid-Open Publication No. 2010-0129411 can receive multiple bands, but the structure is very complicated, and there is a difficulty in the manufacturing process. As described above, since the rod antenna can be inserted only in a linear structure, There is a difficulty in being inserted into a phone terminal.

Korea Patent Publication No. 2010-0129411

Accordingly, it is an object of the present invention to provide a rod antenna which can be inserted into a smartphone terminal while being bent.

And, it is intended to provide a rod antenna that can be used in multiple bands with wide bandwidth due to simple shape change.

According to a preferred embodiment of the present invention, an inflatable length variable multi-stage rod antenna includes: a multi-stage metal rod; And a slit formed on the metal rod.

Here, the slits extend linearly in the longitudinal direction of the metal rod, and have a dipole effect with a different length due to discontinuous wave reflection points at the beginning and the end of the straight slit.

Alternatively, the slit may extend spirally along the length of the metal rod, and may have resonance in multiple bands due to the inductor effect of the spiral slit.

According to the present invention as described above, the slit is formed in the rod antenna, the rod antenna can be bent, the bandwidth can be widened, and the antenna can be used in multiple bands.

And, since the helical slit serves as an inductor, by adjusting at least one of the number of turns, the interval and the length of the helical slit, the inductor on the existing impedance matching circuit can be omitted.

1 is a side view of a rod antenna according to an embodiment of the present invention.
Figure 2 shows an equivalent pole for the rod antenna of Figure 1;
3 shows a slit according to another embodiment of the present invention.
4 shows a slit according to another embodiment of the present invention.
5 is a side view of a rod antenna according to another embodiment of the present invention.
Figure 6 shows an equivalent pole for the rod antenna of Figure 5;

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

The present invention can form a slit in the rod antenna to allow the rod antenna to be refracted while at the same time widening the bandwidth and making it usable in multiple bands.

Hereinafter, a rod antenna according to an embodiment of the present invention will be described with reference to FIGS. 1 and 4. FIG. 1 is a side view of a rod antenna according to an embodiment of the present invention. Figure 2 shows an equivalent pole for the rod antenna of Figure 1; 3 shows a slit according to another embodiment of the present invention. 4 shows a slit according to another embodiment of the present invention. In order to clarify the gist of the present invention, the description of the conventional matters will be omitted or simplified.

Referring to FIG. 1, the rod antenna may include a fixing portion 100, a plurality of metal rods 210, 220, and 230, and a metal wire 300.

The rod antenna may include a plurality of metal rods, and the number of the rod antennas is not limited. Of course, the metal bar may be formed in one stage.

The metal rod 210 is referred to as a first metal rod, the metal rod 220 is referred to as a second metal rod, and the metal rod 230 is referred to as a third metal rod.

The fixing part 100 is inserted into the antenna guide groove (not shown) on the smart phone and can move along the guide groove. When the rod antenna is pulled outward and fixed to the outer end of the guide groove, the rod antenna can be prevented from being separated from the smart phone.

One side of the first metal rod 210 may be hinged to the fixed portion 100 so as to be rotatable.

The second metal rod 220 can slide within the first metal rod 210. The first metal rod 220 is connected to the first metal rod 220 so as not to separate the second metal rod 220 from the first metal rod 210 when the second metal rod 220 is pulled out from the first metal rod 210 . The first locking part 10 is engaged with one end of the first metal rod 210 when the second metal rod 220 is pulled out to prevent the second metal rod 220 from being separated from the first metal rod 210 .

The third metal bar 230 may slide within the second metal bar 220. The third metal rod 230 is connected to the second metal rod 220 so that the third metal rod 230 is not separated from the second metal rod 220 when the third metal rod 230 is pulled out of the second metal rod 220 . The second locking portion 20 is engaged with one end of the second metal rod 220 when the third metal rod 230 is pulled out to prevent the third metal rod 230 from being separated from the second metal rod 220 .

The metal wire 300 can be formed of, for example, titanium wire, and the thin metal wire 300 can be easily refracted and restored by having a thin outer diameter. The metal wire 300 may slide within the third metal bar 230. A third locking portion 30 may be provided at one end of the metal wire 300 so that the metal wire 300 is not separated from the third metal bar 230 when the metal wire 300 is pulled out of the third metal bar 230 have. The third locking part 30 is engaged with one end of the third metal bar 230 when the metal wire 300 is pulled out to prevent the metal wire 300 from being separated from the third metal bar 230 .

Each of the first metal rod 210, the second metal rod 220 and the third metal rod 230 may have at least one linear slit 211, 221, 231 extending in the metal rod longitudinal direction. The first metal rod 210, the second metal rod 220, and the third metal rod 230 can be wheeled when inserted into the antenna guide groove on the smartphone by the slit.

Referring to FIG. 2, the slit formed in the metal rod may have an asymmetric dipole effect, which is different in length by the discontinuous wave reflection points at the beginning of the slit and the end of the slit. Thereby, the bandwidth of the rod antenna is widened and can be used in multiple bands. The length and position of the slit may vary depending on the bandwidth and the band to be used. FIG. 3 illustrates a case where the length of the slits formed in the metal rod are different, and FIG. 4 illustrates a case where the positions of the slits are different. The starting point of the slit and the end of the slit may be variously modified depending on the bandwidth and the band to be used.

In FIG. 2, a plurality of metal rods formed in a plurality of stages may be formed with slits, but the slits may not be formed in any one of the metal rods.

Hereinafter, a rod antenna according to another embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a side view of a rod antenna according to another embodiment of the present invention. Figure 6 shows an equivalent pole for the rod antenna of Figure 5; The description of the foregoing is omitted or simplified.

Referring to FIG. 5, the slits 211c, 221c, and 231c may be formed in a spiral shape. The spiral groove can extend along the longitudinal direction of the metal rod.

Referring to FIG. 6, the helical slits 211c, 221c and 231c can function as inductors. That is, the same effects as those obtained by connecting the inductors by the helical slits 211c, 221c, and 231c can be obtained, so that resonance values can be obtained in multiple bands and the bandwidth can be widened due to multi-inductor effect different depending on positions. Therefore, the length, spacing, number of turns, etc. of the helical slit can be adjusted so that resonance occurs in the frequency band to be used. And, since the helical slit serves as an inductor, by adjusting at least one of the number of turns, the interval and the length of the helical slit, the inductor on the existing impedance matching circuit can be omitted.

In FIG. 5, it is illustrated that slits are formed in all of the plurality of metal rods formed in multiple stages, but slits may not be formed in any one of the metal rods.

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

10: First Laking
20: The second letter king
30: The third king king
100:
210, 210a, 210b: a first metal rod
211, 211a, 211b and 211c:
220: second metal rod
221, 221c: Slit
230: third metal rod
231, 231c: Slit
300: metal wire

Claims (3)

A variable length variable multi-stage rod antenna,
Multi-stage metal rods; And
And a slit formed on the metal rod,
Wherein the slit extends linearly along the longitudinal direction of the metal rod,
And a dipole effect with a different length due to a discontinuous wave reflection point at the start and end of the linear slit.
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