KR100865750B1 - Small type double-band omni antenna - Google Patents

Small type double-band omni antenna Download PDF

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Publication number
KR100865750B1
KR100865750B1 KR1020080031772A KR20080031772A KR100865750B1 KR 100865750 B1 KR100865750 B1 KR 100865750B1 KR 1020080031772 A KR1020080031772 A KR 1020080031772A KR 20080031772 A KR20080031772 A KR 20080031772A KR 100865750 B1 KR100865750 B1 KR 100865750B1
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KR
South Korea
Prior art keywords
antenna
monopole
omni
omni antenna
loop
Prior art date
Application number
KR1020080031772A
Other languages
Korean (ko)
Inventor
김상진
김진학
박종식
최병운
최홍기
Original Assignee
주식회사 감마누
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Publication date
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Priority to KR1020080031772A priority Critical patent/KR100865750B1/en
Application granted granted Critical
Publication of KR100865750B1 publication Critical patent/KR100865750B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
    • H01Q21/205—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path providing an omnidirectional coverage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength

Abstract

The present invention centers a monopole omni antenna for high frequency resonance and arranges a loop antenna for low frequency resonance in a circle around the monopole omni antenna, thereby reducing the size of the dual band omni antenna. As for the device,

A dual band omni antenna device according to the present invention is a dual band omni antenna device for copying an electromagnetic wave signal input through a connector to a free space in a wireless communication system, the monopole omni for resonating a high frequency signal input through the connector antenna; A loop antenna surrounding the monopole omni antenna and resonating a low frequency signal having a lower frequency band than the high frequency signal; A feed line connecting the monopole omni antenna and the loop antenna; And generating the same radiation pattern as that of the dipole antenna by generating an image current equal to the surface current flowing through the monopole omni antenna and the loop antenna, thereby generating a high frequency signal resonated by the monopole omni antenna and a low frequency signal resonated by the loop antenna. Each includes an antenna reflector that radiates into free space,

According to the present invention, in a dual band omni antenna device which performs both high frequency resonance and low frequency resonance, the size of the antenna device can be reduced by using a loop antenna for the resonance of the low frequency band, and the broadband characteristics of the low frequency band are improved by a matching stub. Can be improved.

Description

Small type double-band omni antenna

The present invention relates to a small dual-band omni antenna used in a mobile communication system, and more particularly, to center a monopole omni antenna for high frequency resonance, and to wrap the loop antenna for low frequency resonance in a circle around the monopole omni antenna. The present invention relates to a small dual band omni antenna which can be arranged to reduce the size of the dual band omni antenna.

In general, in a wireless communication system, a relay antenna is installed in each service area, and an omni antenna that can be attached to a ceiling or a wall is used in a sound region such as a building.

1 is a view showing the structure of a conventional dual band omni antenna.

Referring to FIG. 1, the conventional dual band omni antenna 100 includes a connector 11, a first monopole element 12, a second monopole element 13, and a reflector plate 140.

The connector 11 is connected to an external cable through which electromagnetic waves are transmitted, and feeds electromagnetic waves input through the cable to the first monopole element 12 and the second monopole element 13.

The first monopole element 12 resonates a high frequency signal in the 1800 to 2000 MHz band input through the connector 11.

The second monopole element 13 resonates a low frequency signal in the 800 to 900 MHz band input through the connector 11.

The reflector 14 reflects the first monopole element 12 and the second monopole element 13 to generate an image current that is the same as the surface current flowing through the first monopole element 12 and the second monopole element 13, thereby dipole. Make the same radiation pattern as the antenna.

In the conventional dual band omni antenna 100 configured as described above, in order for the low frequency to resonate through the second monopole element 13, the length of the second monopole element 130 should be as long as λ / 4.

Therefore, in order to fabricate a low frequency antenna in the conventional dual band omni antenna 100, there is a problem that the antenna for low frequency resonance must be large.

Meanwhile, when the length of the second monopole element 13 for low frequency resonance is reduced in the conventional dual band omni antenna 100, a non-uniform omnidirectional horizontal beam pattern is generated due to an asymmetry of the current distribution formed in the antenna. In addition, there is a problem that the efficiency of the RF system is lowered by the power reflected back from the antenna input portion as well as the efficiency of the antenna caused by impedance mismatch.

In order to solve the above problems, the present invention centers the monopole omni antenna for high frequency resonance and arranges the loop antenna for low frequency resonance so as to surround the monopole omni antenna in a circular shape, thereby reducing the size of the dual band omni antenna. Its purpose is to provide a small dual band omni antenna.

A dual band omni antenna device according to the present invention for achieving the above object, in the dual band omni antenna device for copying an electromagnetic signal input through a connector in a wireless communication system to a free space, a high frequency input through the connector A monopole omni antenna for resonating a signal; A loop antenna surrounding the monopole omni antenna and resonating a low frequency signal having a lower frequency band than the high frequency signal; A feed line connecting the monopole omni antenna and the loop antenna; And generating the same radiation pattern as that of the dipole antenna by generating an image current equal to the surface current flowing through the monopole omni antenna and the loop antenna, thereby generating a high frequency signal resonated by the monopole omni antenna and a low frequency signal resonated by the loop antenna. Each includes an antenna reflector that radiates into free space.

The apparatus further includes a matching stub for widening the resonant frequency band of the loop antenna.

In addition, the monopole omni antenna is formed in the center of the cylindrical shape, and the loop antenna around the monopole omni antenna in a band-shaped circle surrounding the monopole omni antenna.

In addition, the monopole omni antenna and the loop antenna are made of aluminum or brass.

In addition, the loop antenna resonates in a low frequency band and the circumference of the circle has a half wavelength (λ / 2) length, and the monopole omni antenna resonates in a high frequency band and has a wavelength (λ) / 4 height.

In addition, the monopole omni antenna has a current flow direction upward in the antenna reflector, and the loop antenna has a current flow direction counterclockwise.

In addition, the monopole omni antenna is formed in the center of the cylindrical shape, and the loop antenna around the monopole omni antenna in a band-shaped circle can be formed in a shape surrounding the intermediate position of the monopole omni antenna height.

The antenna feed line interconnects the monopole omni antenna, the loop antenna and the antenna reflector.

According to the present invention, in a dual band omni antenna device which performs both high frequency resonance and low frequency resonance, the size of the antenna device can be reduced by using a loop antenna for the resonance of the low frequency band, and the broadband characteristics of the low frequency band are improved by a matching stub. Can be improved.

Details of the object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood by the following detailed description based on the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing the configuration of a small dual band omni antenna device according to an embodiment of the present invention.

Referring to FIG. 2, the small dual band omni antenna device 200 according to the present invention includes a connector 202, a monopole omni antenna 210, a loop antenna 220, an antenna feed line 230, and a matching stub. 240 and an antenna ground board 250.

The connector 202 is connected to an external cable through which electromagnetic waves are transmitted, and feeds an electromagnetic signal input through the cable connected to the external device to the monopole omni antenna 210.

The monopole omni antenna 210 resonates a high frequency signal input through the connector 202.

The loop antenna 220 has a shape having a very low cylindrical shape and surrounds the monopole omni antenna 210, and resonates a low frequency signal having a low frequency band compared to a high frequency signal.

The antenna feed line 230 connects the monopole omni antenna 210 and the loop antenna 220.

The matching stub 240 widens the resonant frequency band of the loop antenna 220.

The antenna reflector 250 generates the same image current as that of the surface current flowing through the monopole omni antenna 210 and the loop antenna 220 to make the same radiation pattern as the dipole antenna, thereby resonating the high frequency signal by the monopole omni antenna 210. And the low frequency signals resonated by the loop antenna 220 are respectively radiated to free space.

That is, in the small dual band omni antenna device 200, the monopole omni antenna 210 is centered in a cylindrical shape, and the loop antenna 220 is formed in a band around the monopole omni antenna 210 in the form of a band, and the monopole omni antenna. It is a shape surrounding 210.

Here, the monopole omni antenna 210 and the loop antenna 220 are made of aluminum or brass. In addition, the monopole omni antenna 210 and the loop antenna 220 may use a plastic material. In this case, the plastic material may be coated with metal to allow current to flow. This reduces the weight of the small dual-band omni antenna device 200 according to the present invention, thereby preventing damage to the antenna device's own weight when it falls on the floor in a state of being attached to a ceiling or a wall, or falls on the floor during use. To do this.

The diameter of the cylinder constituting the monopole omni antenna 210 is made of a length and thickness enough to pass a high frequency signal of 1800 to 2000 MHz band, the height of the cylinder has a λ (wavelength) / 4 height.

The loop antenna 220 has a length and a thickness enough to pass a low frequency signal in the 800 to 900 MHz band, and a circumference of a circle surrounding the monopole omni antenna 210 has a lambda (wavelength) / 2 length. .

The antenna feed line 230 may be connected to the upper end of the monopole omni antenna 210 by soldering or bolt-nut coupling, and the antenna feed line 230 connected to the monopole omni antenna 210 may be soldered or bolted to the loop antenna 220. Can be connected by nut coupling. Accordingly, the loop antenna 220 is positioned at the upper end of the monopole omni antenna 210 through the antenna feed line 230.

The matching stub 240 may be connected to the antenna feed line 230 by soldering or bolt-nut coupling, and the matching stub 240 connected to the antenna feed line 230 may be parallel to the cylindrical monopole omni antenna 210. 250 is connected by bolt-nut coupling or soldering.

The antenna reflector 250 is made of a metal material having good conductivity to reflect the surface currents of the monopole omni antenna 210 and the loop antenna 220 to generate the same image current.

3A to 3D are diagrams illustrating operation characteristics of a monopole omni antenna in a dual band omni antenna device according to an embodiment of the present invention.

3A to 3D, the electromagnetic signal input through the feed cable from the outside is fed through the connector 202 to the monopole omni antenna 210, which is a high frequency device, and as shown in FIG. 3A, the antenna reflector 250. ) Has a current direction in the upward direction, and creates an electric field as shown in FIG. 3d between the monopole omni antenna 210 and the antenna reflector 250 and is radiated into free space.

In this case, since a weak electromagnetic coupling may be formed between the loop antenna 220 which is a low frequency element and the monopole omni antenna 210 which is a high frequency element, the monopole omni antenna 210 may hardly influence the loop antenna 220. The diameter size of the monopole omni antenna 210 and the loop antenna 220 is designed so as not to receive.

When the dual band omni antenna device 200 operates in the high frequency band by the monopole omni antenna 210, the current flow therein is equivalently represented as in FIG. 3c, and the monopole omni antenna 210, which is a high frequency device, It acts as a monopole antenna with '1/4' height of high frequency wavelength λ h .

The current flowing through the monopole omni antenna 210 is represented as shown in FIG. 3d as an equivalent signal source for calculating the radiation pattern in part I as shown in FIG. 3c, and the surface induced current induced on the surface of the monopole omni antenna 210. Has a current distribution as shown in FIG. 3B.

In FIG. 3C, the signal of the signal source ①, which is the surface current of the monopole omni antenna 210, which is the actual high frequency device, and the signal of part II due to the image effect of the antenna reflector 250, as viewed from the upper part I of the antenna reflector 250 It is shown as the sum of circle ②, and the electromagnetic field in part I is analyzed from the dipole current signal source of signal source ① and signal source ②. In other words, the surface current induced in the monopole omni antenna 210 is combined with the image current generated from the antenna reflector 250 to give the same characteristics as the radiation pattern of the dipole antenna in the portion I. That is, in FIG. 3D,? Denotes an electric field distribution.

On the other hand, since only the connector 202 having no electromagnetic radiation function is located at the lower portion II of the antenna reflector 250, there is no radiation signal source of electromagnetic waves.

4A and 4B are diagrams illustrating operation characteristics of a loop antenna in a dual band omni antenna device according to an embodiment of the present invention.

4A and 4B, the low frequency signal input through the connector 202 is transmitted upward along the monopole omni antenna 210 and the antenna feed line 230 connected to the upper end of the monopole omni antenna 210. It is transmitted to the loop antenna 220 through.

In the loop antenna 220, the low frequency signal transmitted from the monopole omni antenna 210 through the antenna feed line 230 has a current flow direction in a counterclockwise direction as shown in FIG. 4A. At this time, the circumference of the loop antenna 220 has a half wavelength (λ / 2) length.

The loop antenna 220 has a surface current in which a low frequency signal is formed counterclockwise along a circumference, and has a surface current distribution as shown in FIG. 4B.

The surface current distribution shown in FIG. 4B is ideal for operation as a low frequency antenna, and increases the frequency bandwidth by the matching stub 240 connected to the antenna feed line 230.

5A to 5C are diagrams illustrating characteristics of radiation patterns in a dual band omni antenna device according to an embodiment of the present invention.

5A to 5C, in the dual band omni antenna device 200 according to the present invention, the distribution according to each frequency gain is shown to be higher in red as shown in FIG. 5A, and is vertical in the low frequency band. The pattern appears as a symmetrical kidney as shown in FIG. 5B, and in the low frequency band the horizontal pattern appears as close to a circle as shown in FIG. 5C.

6 is a graph showing a VSWR measurement result of a dual band omni antenna device according to an embodiment of the present invention.

Referring to FIG. 6, the dual band omni antenna device 200 according to the present invention measures a VSWR (Voltage Standing Wave Ratio) of a radiation pattern through a monopole omni antenna 210 of a high frequency band and a loop antenna 220 of a low frequency band. The results show that a wide frequency band is available from 700 MHz to 3.5 GHz.

Accordingly, the dual band omni antenna device 200 according to the embodiment of the present invention includes a PCS frequency band of 1,750 to 1860 MHz, a USPCS frequency band of 1,850 to 1960 MHz, a GSM frequency band of 1,710 to 1,800 MHz, and 1,920 to 2,170 MHz. Broadband frequencies of about 700 to 3,500 MHz are available, including the WCDMA frequency band, the Wibro frequency band of 2,300 to 2,390 MHz, and the WiMAX frequency band of 2,400 to 2,500 MHz.

7A and 7B illustrate a configuration of a dual band omni antenna device according to another embodiment of the present invention.

As shown in FIG. 7A, the dual band omni antenna device 710 according to the present invention is a cylindrical monopole omni antenna 210 whose loop antenna 712 is not in the same position as the upper end of the mono pole omni antenna 210. An antenna feed line 714 positioned at a middle height part and fixed to the antenna feed line 714 connected to the monopole omni antenna 210 has a structure in which the antenna feed line 714 to which the loop antenna 712 is fixed is connected to the antenna reflector 250.

In addition, the dual-band omni antenna device 720 according to the present invention, as shown in Figure 7b, the loop antenna 722 is not a cylindrical type having a low height, as shown in Figure 7a has a predetermined interval width It has a cylindrical shape, forms a disk shape having an empty center, and may be connected to the monopole omni antenna 210 by the antenna feed line 230. That is, the monopole omni antenna 210 is erected in the center in a cylindrical shape, the loop antenna 722 around the monopole omni antenna 210 has a cylindrical shape with a predetermined interval, and forms a disk shape with an empty center. The antenna 722 has a shape connected to the monopole omni antenna 210 by the antenna feed line 230.

As described above, according to the present invention, a monopole omni antenna for high frequency resonance is placed in the center, and a loop antenna for low frequency resonance is arranged to surround the monopole omni antenna in a circular shape, thereby reducing the size of the dual band omni antenna. One small dual band omni antenna device can be realized.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above are exemplary in all respects and are not intended to be limiting. You must do it. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

The present invention can be used for a base station antenna of a mobile communication system, and can be applied to a dual band omni antenna device for radiating or receiving a radio signal. In addition, the present invention can be applied to an antenna device having both high frequency resonance and low frequency resonance with respect to the received electromagnetic signal.

1 is a view showing the structure of a conventional dual band omni antenna.

2 is a block diagram showing the configuration of a small dual band omni antenna device according to an embodiment of the present invention.

3A to 3D are diagrams illustrating operation characteristics of a monopole omni antenna in a dual band omni antenna device according to an embodiment of the present invention.

4A and 4B are diagrams illustrating operation characteristics of a loop antenna in a dual band omni antenna device according to an embodiment of the present invention.

5A to 5C are diagrams illustrating characteristics of radiation patterns in a dual band omni antenna device according to an embodiment of the present invention.

6 is a graph showing a VSWR measurement result of a dual band omni antenna device according to an embodiment of the present invention.

7A and 7B illustrate a configuration of a dual band omni antenna device according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: conventional dual band omni antenna 11: connector

12: first monopole element 13: second monopole element

140: reflector 200: dual band omni antenna device

202 connector 210 monopole omni antenna

220: loop antenna 230: antenna feed line

240: matching stub 250: antenna reflector

Claims (10)

A dual band omni antenna device for radiating electromagnetic signals input through a connector into a free space in a wireless communication system, A monopole omni antenna for resonating a high frequency signal input through the connector; A loop antenna surrounding the monopole omni antenna, for resonating a low frequency signal having a lower frequency band than the high frequency signal; An antenna feed line connecting the monopole omni antenna and the loop antenna; By generating the same image current as that of the surface current flowing through the monopole omni antenna and the loop antenna to produce the same radiation pattern as the dipole antenna, the high frequency signal resonated by the monopole omni antenna and the low frequency signal resonated by the loop antenna, respectively An antenna reflector for radiating into free space; And A matching stub connected to the antenna feed line and connected to the antenna reflector in parallel with the monopole omni antenna, for widening a resonant frequency band of the loop antenna; Dual band omni antenna device comprising a. The method of claim 1, And the monopole omni antenna is centered in a cylindrical shape, and the loop antenna is disposed around the monopole omni antenna in a shape of surrounding the monopole omni antenna in a band shape. The method according to claim 1 or 2, And the monopole omni antenna and the loop antenna are made of aluminum or brass. delete The method of claim 1, And the loop antenna resonates in a low frequency band and has a half wavelength (λ / 2) length around the circle. The method of claim 1, The monopole omni antenna resonates in a high frequency band and has a wavelength (λ / 4) height. The method of claim 1, And the monopole omni antenna has a current flow direction in an upward direction in the antenna reflector, and the loop antenna has a current flow direction in a counterclockwise direction. The method of claim 1, The monopole omni antenna is formed in the center in a cylindrical shape, the loop antenna is arranged around the monopole omni antenna in a shape of a band around the middle position of the monopole omni antenna height in a band-shaped circle. Antenna device. The method of claim 8, And the antenna feed line interconnects the monopole omni antenna, the loop antenna and the antenna reflector. The method of claim 1, The monopole omni antenna is erected in the center in a cylindrical shape, and the loop antenna is circumferentially shaped around the monopole omni antenna in a circumferential shape with a predetermined interval, and the loop antenna is formed by the antenna feed line. A dual band omni antenna device, characterized in that connected to a monopole omni antenna.
KR1020080031772A 2008-04-04 2008-04-04 Small type double-band omni antenna KR100865750B1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100945550B1 (en) 2009-09-17 2010-03-08 주식회사 선우커뮤니케이션 Wideband omni-directional antenna
WO2014031303A1 (en) * 2012-08-22 2014-02-27 Symbol Technologies, Inc. Co-located antenna arrangement
WO2017146854A1 (en) * 2016-02-23 2017-08-31 Qualcomm Incorporated Dual resonator antennas
CN108539428A (en) * 2018-03-27 2018-09-14 电子科技大学 A kind of Broadband circularly polarized antenna of omnidirectional radiation
KR102222806B1 (en) * 2020-05-07 2021-03-04 한화시스템 주식회사 Apparatus for receiving broadband frequency and method for controlling broadband frequency
KR102222807B1 (en) * 2020-05-07 2021-03-04 한화시스템 주식회사 Apparatus for receiving dual band frequency and method for controlling dual band frequency

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001223517A (en) * 2000-02-09 2001-08-17 Ntt Docomo Inc Frequency sharing antenna
KR20050025903A (en) * 2003-09-08 2005-03-14 삼성전자주식회사 Small broadband monopole antenna with electromagnetically coupled feed
KR100648834B1 (en) 2005-07-22 2006-11-24 한국전자통신연구원 Small monopole antenna with loop element included feeder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001223517A (en) * 2000-02-09 2001-08-17 Ntt Docomo Inc Frequency sharing antenna
KR20050025903A (en) * 2003-09-08 2005-03-14 삼성전자주식회사 Small broadband monopole antenna with electromagnetically coupled feed
KR100648834B1 (en) 2005-07-22 2006-11-24 한국전자통신연구원 Small monopole antenna with loop element included feeder

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100945550B1 (en) 2009-09-17 2010-03-08 주식회사 선우커뮤니케이션 Wideband omni-directional antenna
WO2014031303A1 (en) * 2012-08-22 2014-02-27 Symbol Technologies, Inc. Co-located antenna arrangement
US8870069B2 (en) 2012-08-22 2014-10-28 Symbol Technologies, Inc. Co-located antenna arrangement
WO2017146854A1 (en) * 2016-02-23 2017-08-31 Qualcomm Incorporated Dual resonator antennas
CN108539428A (en) * 2018-03-27 2018-09-14 电子科技大学 A kind of Broadband circularly polarized antenna of omnidirectional radiation
KR102222806B1 (en) * 2020-05-07 2021-03-04 한화시스템 주식회사 Apparatus for receiving broadband frequency and method for controlling broadband frequency
KR102222807B1 (en) * 2020-05-07 2021-03-04 한화시스템 주식회사 Apparatus for receiving dual band frequency and method for controlling dual band frequency

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