KR200441931Y1 - Slot Type Multi-Band Omni-Antenna - Google Patents

Abstract

The present invention relates to a slot type multi band omni antenna of a wireless communication system, and more particularly, to construct an omni antenna in which slots are formed in two dipole antennas operating in different frequency bands. By reducing the space occupied by the antenna, as a whole it is possible to manufacture a slim antenna with a small volume due to the slot, and relates to a slot-type multi-band omni antenna is not limited by the installation position.

The slotted multi-band omni antenna according to the present invention includes a lower band resonant dipole device and two slots formed on the surface of the lower band resonant dipole device so that two monopoles are symmetrical to resonate in the lower frequency band. In order to resonate in the frequency band is characterized in that it comprises a dielectric ring which is provided between the upper band resonant dipole device consisting of two monopoles and the two monopoles of the lower band resonant dipole device.

Slot, upper band, lower band, resonant dipole element, dielectric ring

Description

Slot Type Multi-Band Omni-Antenna {Slot Type Multi-Band Omni-Antenna}

1 is a perspective view of a dual band omni antenna of a wireless communication system according to the prior art;

2A to 2C are front, side and side cross-sectional views of a slotted multiband omni antenna according to a first embodiment of the present invention.

3A and 3B are front and side cross-sectional views showing the flow of surface current of the slotted multiband omni antenna shown in FIG.

4A and 4B are side and side cross-sectional views showing the flow of surface current of the slotted multi-band omni antenna shown in FIG.

5A and 5B are characteristic diagrams showing a horizontal copy pattern and a vertical copy pattern of a specific frequency band of the slotted multiband omni antenna according to the first embodiment of the present invention.

6A and 6B are characteristic diagrams showing a horizontal radiation pattern and a vertical radiation pattern of a specific frequency band of the slotted multiband omni antenna according to the first embodiment of the present invention.

7A and 7B are characteristic diagrams showing a horizontal copy pattern and a vertical copy pattern of a specific frequency band of the slotted multiband omni antenna according to the first embodiment of the present invention.

8 is a waveform diagram illustrating insertion loss of a slotted multiband omni antenna according to a first embodiment of the present invention.

9 is a front view, side view and side sectional view of a slotted multiband omni antenna according to a second embodiment of the present invention;

Explanation of symbols on the main parts of the drawings

202: feeder

203a, 203b: lower band cylindrical monopole

204a-1, 204a-2, 204b-1, 204b-2: upper band cylindrical monopole

205: dielectric ring

206a-1, 206a-2, 206b-2, 206b-2: slot

207a, 207b: lower band conical monopole

208a-1, 208a-2, 208b-1, 208b-2: Upper band conical monopole

The present invention relates to a slot type multi-band omni antenna of a wireless communication system, and more specifically, to an omni antenna having a slot formed in two dipole antennas operating in different frequency bands. By reducing the space occupied by the antenna, as a whole it is possible to manufacture a slim antenna with a small volume due to the slot, and relates to a slot-type multi-band omni antenna is not limited by the installation position.

In general, wireless communication systems such as digital cellular, personal mobile communication (PCS), mobile Internet, and digital broadcasting systems are located in places where radio waves are weak in shadowed areas. In order to provide a relay antenna is installed. As the relay antenna, omni-directional antenna is used.

1 is a perspective view of a dual band omni antenna of a wireless communication system according to the prior art. Referring to this, the dual band omni antenna according to the related art is a connector 101 connected to an external cable through which electromagnetic waves are transmitted, and the connector ( A first monopole element 102 for resonating a high frequency signal of a high frequency band (for example, 1800 to 2000 MHz) input through 101, and a low frequency band (800 to 900 MHz) of low frequency band input through the connector 101. Reflector plate for generating the same radiation pattern as the dipole antenna by generating the same image current as the surface current flowing through the second monopole element 103, the first monopole element 102 and the second monopole element 103 for resonating the signal And a dome-shaped cover 105 provided outside to protect the first and second monopole elements 102 and 103 and the reflector plate 104.

However, since the dual band omni antenna according to the prior art as described above uses a monopole device, there is a problem that a conductor reflector of a suitable size is required for generating a desired radiation pattern. Such a conductor reflector is the biggest factor that increases the volume occupied by the entire antenna. Also, the shape of the entire antenna generally has a conical shape. There was a problem.

An object of the present invention is proposed to improve the problems according to the above and the prior art, a slot that can be installed in various places by showing a multi-band resonance characteristics, reducing the space occupied by the conductor reflector and having a slim structure due to the slot To provide a multiband omni antenna.

Another object of the present invention is to provide a good radiation characteristics without the use of a conductor reflector using a dipole element rather than a monopole element, slot-type multiband omni having multiband and broadband characteristics that can be used in wireless communication systems of various fields It is to provide an antenna.

According to a preferred embodiment of the present invention for achieving the object as described above, the slot-type multi-band omni antenna is a lower band resonant dipole device is formed so that two monopoles are symmetrical to resonate in the lower frequency band; An upper band resonant dipole device comprising a slot formed on a surface of the lower band resonant dipole device, the upper band resonant dipole device comprising two monopoles for resonating in an upper frequency band; And a dielectric ring provided between the two monopoles of the lower band resonant dipole device.

In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the configuration and operation of the slot-type multiband omni antenna according to the present invention will be described in detail with reference to the accompanying drawings.

2A to 2C are front, side and side cross-sectional views of a slotted multiband omni antenna according to an embodiment of the present invention, and FIGS. 3A and 3B are surface currents of the slotted multiband omni antenna shown in FIG. 2. 4A and 4B are side views and side cross-sectional views showing the flow of surface current of the slotted multi-band omni antenna shown in FIG.

2A and 2B, a slotted multi-band omni antenna according to an embodiment of the present invention has a connector 201 connected to an external cable and two slots for resonating in a lower frequency band (for example, 800 to 900 MHz). Lower band resonant dipole elements 203a and 203b formed such that two monopoles are symmetrical; It consists of the slots (206a-1, 206b-1) formed on the surface of the lower band resonant dipole element, the upper band resonant consisting of two monopoles to resonate in the upper frequency band (for example 1.8 ~ 2.0GHz) Dipole elements 204a-1,204a-2,204b-1,204b-2; And a dielectric ring 205 provided between the two monopoles of the lower band resonant dipole device.

Referring to FIG. 2C, a feed line 202 is connected to an inside of the lower band resonant dipole to feed the RF signal to the lower band resonant dipole and the upper band resonant dipole.

The feed line 202 is electrically connected to the second monopole 203a so as to be symmetrical with the first monopole 203b through the inside of the lower band resonant dipole element 203b so as to be symmetric to the first monopole 203b. And RF signals to the upper band resonant dipole elements 204a-1, 204a-2, 204b-1, and 204b-2. The inner core of the feed line 202 is connected to the second monopole 203a through the first monopole 203b without electrical contact by a cable dielectric.

The dielectric ring 205 prevents the bending of the feed line and maintains a gap between the two monopoles of the lower band resonant dipole, in which the slot-type upper band resonant dipole is integrally formed so as to be structurally stable.

The slot is characterized in that the pair is formed in each of the corresponding position (206a-1, 206b-1, 206a-2, 206b-2).

The length of the lower band resonant dipole element 203a is longer than that of the upper band resonant dipole element 204a-1.

The upper outer circumferential surface diameter of the lower band resonant dipole device 203a is the same as the outer circumferential surface diameters of the upper band resonant dipole elements 204a-1 and 204a-2, and is formed in a cylindrical shape as a whole.

The slots formed in the lower band resonant dipole elements 203a and 203b have a corresponding '∩' shape.

3A and 3B, the upper band resonant dipole elements 204a-1, 204a-2, 204b-1, and 204b-2 are integrally formed with the lower band resonant dipole elements 203a and 203b. -Two pairs of short monopoles 204a-1, 204a-2, 204b-1, 204b- formed by -1, 204a-2, 204b-1, 204b-2, and having an electrically length corresponding to the upper frequency 2), it works well for the relay antenna in the upper frequency band.

In detail, the upper frequency band operates as an antenna by surface current concentrated in short dipoles divided into slots.

4A and 4B, the lower band resonant dipole elements 203a and 203b emit signals with an electrical resonance length corresponding to a lower frequency, and more specifically, two monopoles 203a and 203b are electrically connected. Since they operate in combination with each other, the signal corresponding to the electrical resonance length corresponding to the lower frequency is radiated.

That is, in the lower frequency band, the synthesized current flow of surface currents formed on the surfaces of the lower band resonant dipole elements 203a and 203b operates as an antenna corresponding to the lower frequency band.

In detail, the lower frequency band is operated as an antenna by the surface current generated along the entire long dipole on the surface where the slot of the lower band resonant dipole is not formed.

In the embodiment of the present invention, the lower frequency band has a characteristic of resonating as a dipole having an entire electrical length as a general dipole. Therefore, the influence of the slot in the dipole on the resonance frequency of the lower frequency band is minimal.

In addition, in the upper frequency band, a slot is formed in the cylinder to form a dipole having an electrical length to operate in the upper frequency band to cause resonance.

Table 1 below shows a preferred bandwidth as a result of measuring the operating bandwidth in the first and second frequency bands of the slotted multiband omni antenna according to the present invention.

VSWR 1: 2 First frequency band 2nd frequency band  Bandwidth (BW) 105 MHz 740 MHz 12% (f1 = 0.85 GHz) 37% (f2 = 2 GHz)

5A and 5B are characteristic diagrams showing a horizontal copy pattern and a vertical copy pattern of a specific frequency band of a slot-type multiband omni antenna according to an embodiment of the present invention.

The characteristic diagrams shown in FIGS. 5A and 5B show the results measured at 824 MHz. The slotted multi-band omni antenna according to the present invention shows a radiation pattern according to radiation characteristics suitable for an antenna for a relay without a conductor reflector in the 824 MHz frequency band.

6A and 6B are characteristic diagrams showing a horizontal copy pattern and a vertical copy pattern of a specific frequency band of a slot-type multiband omni antenna according to an embodiment of the present invention.

6A and 6B show the results measured at 1880 MHz. The slotted multi-band omni antenna according to the present invention shows a radiation pattern according to radiation characteristics suitable for an antenna for relay without a conductor reflector in the 1880 MHz frequency band.

7A and 7B are characteristic diagrams showing a horizontal copy pattern and a vertical copy pattern of a specific frequency band of a slot-type multiband omni antenna according to an embodiment of the present invention.

The characteristic diagrams shown in FIGS. 7A and 7B show the results measured at 2170 MHz. The slotted multi-band omni antenna according to the present invention shows good radiation characteristics for the relay antenna without the conductor reflector in the 2170 MHz frequency band.

8 is a waveform diagram illustrating insertion loss of a slotted multiband omni antenna according to an embodiment of the present invention.

As shown in FIG. 8, the slotted multiband omni antenna according to the present invention shows that the multiband characteristic is satisfied.

9 is a front view, a side view and a side cross-sectional view of a slotted multiband omni antenna according to a second embodiment of the present invention.

As shown in FIG. 9, the lower band resonant dipoles 207a and 207b and the upper band resonant dipole of the slotted multiband omni antenna according to the second embodiment of the present invention are respectively two conical monopoles (208a-1, Conical dipoles consisting of 208a-2, 208b-1, and 208b-2) Conical dipoles have a wider bandwidth because current paths formed on the dipole surface are more diversified than the cylindrical dipoles applied in the first embodiment described above. There is an advantage.

In addition, in the second embodiment, the ratio of the diameters of both ends of the conical monopoles constituting the conical dipole is preferably in the range of 0.5 to 0.99: 1.

The above descriptions are merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention belongs may make various modifications and changes without departing from the essential features of the present invention. Therefore, the protection scope of the present invention should be interpreted by the claims below, and all technical ideas within the equivalent scope should be interpreted as belonging to the scope of the present invention.

As described above, the slotted multiband omniantenna according to the present invention is multibanded through a lower band resonant dipole element and an upper band resonant dipole element of a cylindrical dipole as in the first embodiment or a conical dipole as in the second embodiment. Frequency transmission and reception is possible, and there is an effect of providing a mobile communication service such as cellular, personal mobile communication, WCDMA and wireless mobile Internet by one antenna.

Therefore, if the slotted multi-band omni antenna according to the present invention is applied, the service provider can reduce the purchase and installation costs compared to installing the antenna of each frequency band.

In addition, compared to the omni antenna mentioned in the prior art, the slot-type multi-band omni antenna according to the present invention is not only good in appearance but also can be installed in various places because of its small volume and the appearance of a rod. In addition to building walls, it can be installed in shaded areas where mobile communication service is difficult.

Claims (8)

A lower band resonant dipole device in which two monopoles are symmetrical to resonate in the lower frequency band; An upper band resonant dipole device comprising a slot formed on a surface of the lower band resonant dipole device and comprising two monopoles for resonating in an upper frequency band; And A dielectric ring disposed between two monopoles of the lower band resonant dipole; And each monopole constituting the lower band resonant dipole element and the upper band resonant dipole element is formed integrally as a conical shape. The method of claim 1, And a feed line connected to an inside of the lower band resonant dipole, and configured to feed a signal to the lower band resonant dipole and the upper band resonant dipole. The method of claim 1, The length of the lower band resonant dipole element is longer than the length of the upper band resonant dipole element slot type multi-band omni antenna. delete delete The slotted multi-band omni antenna according to claim 1, wherein the conical monopole has an upper diameter to a lower diameter ratio of 0.5 to 0.99: 1. The method of claim 1, Slots formed on the surface of the lower band resonant dipole device is a slot type multi-band omni antenna, characterized in that each pair is formed in a corresponding position. 8. The slot type multiband omni antenna according to claim 7, wherein the slot formed in the lower band resonant dipole has a '인' shape.

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