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KR20110047544A - Wideband dual polarized log-periodic dipole array antenna - Google Patents

Wideband dual polarized log-periodic dipole array antenna Download PDF

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Publication number
KR20110047544A
KR20110047544A KR1020090104218A KR20090104218A KR20110047544A KR 20110047544 A KR20110047544 A KR 20110047544A KR 1020090104218 A KR1020090104218 A KR 1020090104218A KR 20090104218 A KR20090104218 A KR 20090104218A KR 20110047544 A KR20110047544 A KR 20110047544A
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South Korea
Prior art keywords
dielectric substrate
radiating element
band
dielectric
array antenna
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Application number
KR1020090104218A
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Korean (ko)
Inventor
박성욱
신동헌
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한국과학기술원
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Priority to KR1020090104218A priority Critical patent/KR20110047544A/en
Publication of KR20110047544A publication Critical patent/KR20110047544A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/10—Logperiodic antennas
    • 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
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • H01Q21/12—Parallel arrangements of substantially straight elongated conductive units
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/10—Resonant antennas
    • 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

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Abstract

The present invention relates to a wideband antenna, and the present invention relates to two dielectric substrates each having a vertical component as a central axis, and a logarithmic period ratio and a spacing constant including a dielectric constant of the dielectric substrate. At least one radiating element arranged on both sides and a transmission line provided in the center of the radiating element. According to the present invention, not only a high gain can be obtained at each resonant frequency but also there is an effect of broadband characteristics including various frequencies.

Antennas, broadband, dual polarization, logarithmic periods, dipoles, dielectric substrates, vertical components.

Description

Wideband dual polarized log-periodic dipole array antenna

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wideband antenna, and more particularly, to a wideband dual polarized log period dipole array antenna capable of simultaneously using vertical polarization and horizontal polarization.

In recent years, wireless communication satisfies the high speed of the system and the high capacity of transmission data. In order to solve the problem of low frequency saturation of the frequency band, frequency distribution to a higher frequency band is being implemented. In particular, the frequency band from 1.8 GHz to 6 GHz is a core band of wireless communication systems such as IMT-2000, wireless LAN, ISM band, portable wireless Internet band, etc., which have recently become an issue. Implementation is also attracting attention as a key area of research. Antennas satisfying such broadband are various types of antennas whose performance has already been proven, for example, lead antennas, helical antennas, biconical antennas, sleeve antennas, spiral antennas, logarithmic antennas, and yagi-wooda (YAGI-UDA). ) Antennas, etc.

Among these various antennas, the logarithmic antenna is an antenna whose impedance and radiation characteristics are repeated periodically with respect to the frequency. It is regarded as a frequency-independent antenna because the characteristic change over the frequency band is not large. Trapezoidal, trapezoidal wire, trapezoidal wedge wire, and zigzag wire have been developed in various forms.

1 is a diagram illustrating the structure and design parameters of a typical single logarithmic period dipole antenna.

In a typical single log-periodic dipole antenna, N dipole elements 3-1 to 3-8 are vertically arranged at regular intervals by a logarithmic ratio τ and an interval constant σ. 3-1 to 3-8) are arranged to gradually increase in length from left to right. Power is fed from the feed point 1 of the vertex to each dipole element, and the feed signal is transmitted through a parallel transmission line (Boom 5).

As shown in FIG. 1, a k denotes a radius of the dipole elements 3-1 to 3-8, L k denotes a length of the dipole elements 3-1 to 3-8, and d k denotes a dipole element ( The interval between 3-1 and 3-8), Y T represents the terminal admittance. Structural constants having logarithmic cycle characteristics include a scaling constant τ that determines the length of the dipole elements 3-1 to 3-8 and a scaling constant σ that determines the interval.

The biggest advantage of the logarithmic period dipole antenna is that it has a wideband characteristic, and there is a wideband logarithmic period dipole array antenna as a conventional technique using the wideband characteristic. The conventional broadband logarithmic period dipole antenna is an antenna consisting of only horizontal polarization or vertical polarization. In order to use it as a reference antenna for antenna measurement, it is inconvenient to change the direction of the antenna artificially or mechanically. In addition, when the direction of the reference antenna is artificially or mechanically changed, there is a problem in that it is difficult to obtain the same result every time due to the origin mismatch.

The present invention has been made to solve the above problems, and can obtain a high gain in a wide resonant frequency band, as well as the wideband dual polarization log number to radiate by converting horizontal and vertical polarization through switching without moving the antenna It is an object to provide a periodic dipole array antenna.

In addition, another object of the present invention is to provide a wideband dual polarization logarithmic period dipole array antenna that can have an advantage in terms of cost competitiveness through the simplification of manufacturing by arranging a plurality of radiating elements on both sides of the dielectric substrate.

The present invention for achieving the above object is set by two dielectric substrates provided on both sides with a vertical component as a central axis, the logarithmic cycle ratio and the interval constant including the dielectric constant of the dielectric substrate on both sides of the dielectric substrate At least one radiating element arranged and a transmission line provided in the center of the radiating element.

The radiating element is provided on one side of the dielectric substrate, and is provided on the first radiating elements arranged on the other side of the dielectric substrate and alternately arranged according to the interval, and on the other side of the dielectric substrate, and the bisector of the first radiating element. It may include a second radiating elements arranged symmetrically with respect to the length.

The first and second radiating elements may be arranged in different lengths and intervals by a logarithmic period ratio and an interval constant including a dielectric constant of the dielectric substrate.

The first and second radiating elements may be impedance-matched in a plurality of resonant frequency bands by alternately feeding signals through the transmission line.

The logarithmic period ratio τ is L k = radiator length, d k = interval between radiators,

Figure 112009066890833-PAT00001
(k = 1,2, ... n-1).

The dielectric substrate may be a flat circuit board having a dielectric constant. At this time, the dielectric constant of the dielectric substrate is preferably 4.6.

The first and second radiating elements may be arranged in different lengths according to intervals to form a plurality of resonant frequency bands.

The plurality of resonance frequency bands may include a cellular band, a long term evolution (LTE) band, a personal communication services (PCS) band, an IMT-2000, and a wireless LAN band.

The dielectric substrate includes a horizontal component, and each horizontal component and the vertical component may be combined with a broadband power divider.

According to the present invention, the signals are arranged at lengths and intervals of the LTE frequency band, the PCS frequency band, the IMT-2000 frequency band, and the wireless LAN (IEEE 802.11a / b) frequency band through transmission lines provided on both sides of the dielectric substrate. By feeding the radiating element at the intersection and matching the impedance, not only high gain can be obtained at each resonant frequency but also there is an effect of broadband characteristics including various frequencies.

In addition, since it contains horizontal and vertical components, it is possible to measure horizontal polarization and vertical polarization by simple switching without moving the antenna.

In addition, by arranging the radiating elements on both sides of the dielectric substrate, there is an effect that it is easy to manufacture and have an advantage in terms of cost competitiveness.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used for the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a diagram illustrating a structure of a wideband dual polarized log period dipole array antenna according to the present invention.

As shown in FIG. 2, the broadband dual polarized logarithmic period dipole array antenna according to the present invention is a basic structure of the logarithmic period antenna by Carrel, and a spacing constant for determining a spacing ratio τ, which is a design parameter, and an interval. In consideration of the dielectric constant ε eff of the dielectric substrate at (Spacing factor) σ, the lengths of the radiating elements 300 are determined to be arranged at predetermined intervals.

In the present invention, the logarithmic period ratio τ may be defined as follows.

That is, the logarithmic period ratio τ is L k = radiator length, d k = interval between radiators,

[Equation 1]

Figure 112009066890833-PAT00002
(k = 1,2, ... n-1).

Radiating element 300 corresponding to the resonant frequency band to be designed by the scaling factor σ determining the interval and the scaling factor τ, which is a design parameter including the dielectric constant ε eff of the dielectric substrate 210 ) Length and spacing are determined. In addition, the resonance frequency band is determined as the resonance frequency of the longest element and the shortest element, and a low dielectric constant dielectric substrate 210 having low dielectric loss is used to increase the gain of the antenna.

The dielectric substrate 210 includes horizontal components, and each of the horizontal components and the vertical components 400 may be combined with a broadband power divider.

The broadband dual polarization logarithmic period dipole array antenna according to the present invention includes a dielectric substrate 210, at least one radiating element 220 arranged on both sides of the dielectric substrate 210, and a transmission line 230 provided at the center of the radiating element. It is composed of

Two dielectric substrates 210 are provided on both sides with the vertical component 400 as a central axis, and are formed as a flat circuit board having a dielectric constant ε eff of 4.6 and a thickness of 3.2 mm.

The radiating element 220 is set by the logarithmic period ratio τ including the dielectric constant of the dielectric substrate 210 and the interval constant σ and is arranged on both sides of the dielectric substrate 210.

The radiating element 220 is provided on one side of the dielectric substrate 210, and is provided on the other side of the first radiating element 300 and the dielectric substrate 210 which are alternately arranged according to the intervals in which the set length is divided into two parts. And a second radiating element 310 arranged symmetrically with a bisected length of the first radiating element 300.

The first radiating element 300 and the second radiating element 310 may be arranged in different lengths and intervals by a logarithmic period ratio τ including the dielectric constant of the dielectric substrate 210 and an interval constant σ.

The first radiating element 300 and the second radiating element 310 are fed at a signal through the transmission line 230 and are matched with impedance in a plurality of resonant frequency bands.

In the present invention, the radiating elements 220 may be arranged in different lengths according to the spacing to form a plurality of resonant frequency bands. That is, the radiating element 220 may include a cellular band 250, a long term evolution (LTE) band 260, a personal communication services (PCS) band 270, and an IMT− on one side of the dielectric substrate 210. Lengths and intervals are set in a plurality of patterns corresponding to half-wavelength lengths up to frequency bands such as the 2000 band 280 and the wireless LAN (IEEE 802.11a / b, not shown) band.

In addition, the radiating element 220 has a cellular band 250, an LTE band 260, a PCS band 270, an IMT-2000 band 280, and a wireless LAN (IEEE 802.11a /) on one side of the dielectric substrate 210. b, not shown) the first radiating element 300, the cellular band 250, the LTE band 260, the PCS in which a plurality of patterns whose corresponding lengths of the bands are bisected are arranged horizontally alternately in a vertical direction at corresponding intervals. The lengths of the corresponding patterns in the band 270, the IMT-2000 band 280, and the wireless LAN (IEEE 802.11a / b, not shown) frequency band are symmetrical with the bisected first radiating element 300 and the dielectric substrate 210 The second radiating element 310 is arranged horizontally in the vertical direction to the other side of the ().

Therefore, the first radiating element 300 and the second radiating element 310 is a cellular band 250, LTE band 260, PCS band 270, IMT-2000 band 280, WLAN (IEEE 802.11a) / b, not shown) A plurality of resonant frequency bands 250 to 280 are formed by arranging patterns different in a corresponding length and interval of the band on both sides of the dielectric substrate 210.

The transmission line 230 is provided at the center of the radiating elements 300 and 310. The transmission line 230 is connected to the vertical direction from the center of the patterns arranged according to the length and the interval corresponding to the designed resonant frequency band provided as a pattern on both sides of the dielectric substrate 210, the feed point 240 to feed the signal ) Is formed. On the other hand, the longer the length of the transmission line 230, the higher the gain of the antenna, the better standing wave characteristics appear.

The broadband dual polarized logarithmic period dipole array antenna 200 according to the present invention is fed to the radiating element 220 arranged on both sides through a transmission line provided in the vertical direction on the dielectric substrate 210, so that the impedance is matched. As a result, not only a high gain can be obtained in the resonant frequency band (0.7 kHz to 6 kHz), but also distortion of the radiation pattern according to the broadband characteristics is prevented.

In the wideband dual polarized logarithmic period dipole array antenna according to the present invention, the vertical component 400 is symmetrical with the horizontal component to emit not only the horizontal polarization but also the vertical polarization. In addition, it exhibits a high isolation characteristic of -30 dB by using pattern diversification to reduce interference between the horizontal component and the vertical component 400.

3 is a diagram illustrating gain characteristics of a wideband dual polarized logarithmic period dipole array antenna according to the present invention. In FIG. 3, a solid line is a gain characteristic graph of a horizontal antenna, and a dotted line is a gain characteristic graph of a vertical antenna.

As shown in FIG. 3, the wideband dual polarized logarithmic period dipole array antenna 200 according to the present invention exhibits gain characteristics over a broadband of 0.7 GHz to 6 GHz.

4 is a diagram illustrating a return loss characteristic of a wideband dual polarized logarithmic period dipole array antenna according to the present invention. In FIG. 4, the solid line is a return loss characteristic graph of a horizontal antenna, and the dotted line is a return loss characteristic graph of a vertical antenna.

As shown in FIG. 4, the wideband dual polarized logarithmic period dipole array antenna 200 according to the present invention exhibits excellent return loss characteristics with a return loss of -10 dB or less over a broadband of 0.7 GHz to 6 GHz.

5 is a diagram illustrating isolation between ports of a wideband dual polarized logarithmic period dipole array antenna according to the present invention.

Referring to FIG. 5, the broadband dual polarization logarithmic period dipole array antenna 200 of the present invention exhibits isolation characteristics of -30 dB or more, which can ignore interference between ports.

6A to 6F illustrate radiation pattern (dBi) characteristics of a wideband dual polarized logarithmic period dipole array antenna according to the present invention.

While the invention has been described using some preferred embodiments, these embodiments are illustrative and not restrictive. Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the invention and the scope of the rights set forth in the appended claims.

1 is a diagram showing the structure and design parameters of a general log period dipole antenna;

2 is a diagram illustrating a structure of a wideband dual polarized logarithmic period dipole array antenna according to the present invention;

3 is a diagram illustrating gain characteristics of a wideband dual polarized log period dipole array antenna according to the present invention;

4 is a diagram illustrating return loss characteristics of a wideband dual polarized log period dipole array antenna according to the present invention;

5 is an isolation diagram between ports of a wideband dual polarized log period dipole array antenna according to the present invention;

6A to 6F illustrate radiation pattern characteristics of a wideband dual polarization logarithmic period dipole array antenna according to the present invention.

* Description of the symbols for the main parts of the drawings *

1 feed point 3-1, 3-8 dipole element

5 transmission line 210 dielectric substrate

220 Radiating element 230 Transmission line

240 feed points 250 cellular bands

260 LTE band 270 PCS band

280 IMT-2000 band 300 first radiating element

310 Second Radiating Element 400 Vertical Component

200 wideband dual polarized log period dipole array antenna

Claims (10)

Two dielectric substrates provided on both sides of the vertical component with a central axis; At least one radiating element arranged on both sides of the dielectric substrate by a logarithmic period ratio and an interval constant including a dielectric constant of the dielectric substrate; And Broadband dual polarized logarithmic period dipole array antenna comprising a transmission line provided in the center of the radiating element. The method of claim 1, The radiating element, First radioactive elements provided on one side of the dielectric substrate, the set lengths being bisected and alternately arranged in accordance with an interval; And And a second radiating element provided on the other side of the dielectric substrate and arranged symmetrically with a bisected length of the first radiating element. The method of claim 2, And the first and second radiating elements are arranged at different lengths and intervals by a logarithmic period ratio and an interval constant including a dielectric constant of the dielectric substrate. The method of claim 2, And the first and second radiating elements are impedance-matched in a plurality of resonant frequency bands by supplying signals alternately through the transmission line. The method of claim 3, The logarithmic period ratio τ is L k = radiator length, d k = interval between radiators,
Figure 112009066890833-PAT00003
(k = 1,2, ... n-1), a wideband dual polarized logarithmic period dipole array antenna. The method of claim 1, And said dielectric substrate comprises a planar circuit board having a dielectric constant. The method of claim 6, And a dielectric constant of said dielectric substrate is 4.6. The method of claim 2, And the first and second radiating elements are arranged in different lengths according to intervals to form a plurality of resonant frequency bands. The method of claim 8, The plurality of resonant frequency bands include a cellular band, a long term evolution (LTE) band, a personal communication services (PCS) band, an IMT-2000, and a wireless LAN band. antenna. The method of claim 1, And said dielectric substrate comprises a horizontal component, each horizontal component and said vertical component being coupled to a wideband power divider.
KR1020090104218A 2009-10-30 2009-10-30 Wideband dual polarized log-periodic dipole array antenna KR20110047544A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101214619B1 (en) * 2011-06-16 2013-01-09 주식회사 이엠따블유 Log periodic dipole antenna
KR101223935B1 (en) * 2011-06-16 2013-02-05 주식회사 이엠따블유 Log periodic dipole antenna
KR20130133556A (en) * 2012-05-29 2013-12-09 한국전자통신연구원 Folded log periodic antenna in communication system
CN107579330A (en) * 2017-08-31 2018-01-12 华桂星 A kind of antenna assembly and its apply the signal coverage method in elevator hoistways
KR101971659B1 (en) * 2018-12-26 2019-04-23 주식회사 선우커뮤니케이션 High-gain Yagi antenna
CN110148834A (en) * 2019-05-21 2019-08-20 华东师范大学 High-gain log-periodic antenna based on disresonance type break bounds face
CN111224212A (en) * 2020-02-16 2020-06-02 山东华箭科工创新科技有限公司 Novel 5G omnidirectional high-gain antenna
CN111641027A (en) * 2020-04-29 2020-09-08 西安外事学院 Leaky-wave edge-emitting array antenna based on parallel double lines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101214619B1 (en) * 2011-06-16 2013-01-09 주식회사 이엠따블유 Log periodic dipole antenna
KR101223935B1 (en) * 2011-06-16 2013-02-05 주식회사 이엠따블유 Log periodic dipole antenna
KR20130133556A (en) * 2012-05-29 2013-12-09 한국전자통신연구원 Folded log periodic antenna in communication system
CN107579330A (en) * 2017-08-31 2018-01-12 华桂星 A kind of antenna assembly and its apply the signal coverage method in elevator hoistways
KR101971659B1 (en) * 2018-12-26 2019-04-23 주식회사 선우커뮤니케이션 High-gain Yagi antenna
CN110148834A (en) * 2019-05-21 2019-08-20 华东师范大学 High-gain log-periodic antenna based on disresonance type break bounds face
CN111224212A (en) * 2020-02-16 2020-06-02 山东华箭科工创新科技有限公司 Novel 5G omnidirectional high-gain antenna
CN111641027A (en) * 2020-04-29 2020-09-08 西安外事学院 Leaky-wave edge-emitting array antenna based on parallel double lines
CN111641027B (en) * 2020-04-29 2024-04-23 西安外事学院 Leaky-wave side-emission array antenna based on parallel double lines

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