WO2001061784A1 - Antenne en forme de noeud papillon - Google Patents

Antenne en forme de noeud papillon Download PDF

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Publication number
WO2001061784A1
WO2001061784A1 PCT/NL2001/000098 NL0100098W WO0161784A1 WO 2001061784 A1 WO2001061784 A1 WO 2001061784A1 NL 0100098 W NL0100098 W NL 0100098W WO 0161784 A1 WO0161784 A1 WO 0161784A1
Authority
WO
WIPO (PCT)
Prior art keywords
feedpoint
bowtie antenna
antenna according
slots
distance
Prior art date
Application number
PCT/NL2001/000098
Other languages
English (en)
Inventor
Andrian Andaya Lestari
Alexander Georgievich Yarovoy
Leonardus Petrus Lighart
Original Assignee
Stichting Voor De Technische Wetenschappen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stichting Voor De Technische Wetenschappen filed Critical Stichting Voor De Technische Wetenschappen
Priority to AU2001236189A priority Critical patent/AU2001236189A1/en
Publication of WO2001061784A1 publication Critical patent/WO2001061784A1/fr

Links

Classifications

    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/40—Element having extended radiating surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing

Definitions

  • the invention relates to a bowtie antenna comprising a feedpoint for radiating energy, and flat mutually opposing arms that in use radiate at least part of the energy supplied at the feedpoint, wherein the feedpoint is positioned in between the said arms, and wherein each of the arms comprises a carrier and an electrically conductive element attached to the carrier.
  • the carrier is a substrate to which the conductive element is attached.
  • Such a bowtie antenna is known from practice, and is used as ground penetrating radar, for instance in geological applications searching for metal or determining the ground- water level, or determining the presence of pipes or electrical wiring.
  • Another application is landmine detection.
  • Such applications require that the antenna is capable to radiate and to receive in a wide spectrum and that ringing is virtually absent.
  • the invention aims in providing a bowtie antenna having improved properties with respect to the amount of radiated energy and suppression of ringing, and to arrive at further advantages that will become apparent from the following description.
  • the bowtie antenna is characterized in that each of the arms has a series of electrically conductive elements attached to the carrier (the substrate) , separated from each other at predetermined distances so as to define slots between neighbouring elements .
  • the inventors have found that these slots introduce a capacitive loading on the antenna surface, which reduces the reflection of currents at the open end of the antenna.
  • the bowtie antenna is characterized in that each of the slots has a width that depends on its distance from the feedpoint .
  • the advantages of the invention are particularly accomplished in the embodiment of the bowtie antenna in which the width of neighbouring slots increases proportionally with their distance with respect to the feedpoint.
  • the difference in width of neighbouring slots equals approximately a proportion of 0.0005 times the center wavelength of the radiated energy.
  • the bowtie antenna according to the invention is characterized in that the slot closest to the feedpoint has a distance with respect to said feedpoint equal to approximately one fourth of the center wavelength of the radiated energy.
  • the bowtie antenna is optimized to radiate maximum power. The maximum amplitude of any energy radiated by the antenna is almost two times higher than the maximum amplitude of the radiated energy from a bowtie antenna according to the prior art.
  • the bowtie antenna is characterized in that on its surface the antenna is provided with a layer of microwave absorbing material covering the slots; a suitable material is for instance ECCOSORB AN-79 or any other material with similar properties.
  • a suitable material is for instance ECCOSORB AN-79 or any other material with similar properties.
  • the series of slots on the antenna arms together with the covering of the slotted surface of the antenna by an absorbing material effectively suppresses any residue of late-time ringing, and thus gives a time-domain response with a very flat tail following the main waveform.
  • the slot closest to the feedpoint has a distance with respect to said feedpoint equal to approximately 0.4 times the center wavelength of the radiated energy, whereby the width of said slot equals approximately 0.008 times the said center wavelength.
  • the lowest level of late-time ringing may then be accomplished, which is particularly useful in ground penetrating applications .
  • Fig. 1 showing a photograph of a prototype of one embodiment of the bowtie antenna according to the invention
  • Fig. 2 showing a normalized time-domain response of the bowtie antenna of the invention as compared to the response from a bowtie antenna according to the prior art
  • FIG. 3 showing a graph of the receiving sensitivity of the bowtie antenna according to the invention and a bowtie antenna according to the prior art .
  • Fig. 4 shows schematically a second embodiment of the bowtie antenna according to the invention.
  • Fig. 1 shows a particular embodiment of the bowtie antenna according to the invention, which comprises a number of slots on the antenna surface and microwave absorbing materials which are used to cover the slotted surfaces of the antenna on one side in order to suppress unwanted radiation from the slots.
  • the width of the slots increases linearly from the feedpoint towards the open end of the bowtie by a step in the order of 0.0005 of the center wavelength of the radiated pulse.
  • the bowtie antenna according to the invention can be used in a frequency-range from 100 MHz to 6 GHz having corresponding wave-lengths of at least 5 cm.
  • the slots are separated equally by a constant center-to-center spacing of about 0.02 times the center wavelength of the radiated ( pulse.
  • This slotted bowtie antenna can be optimized to obtain the lowest level of late-time ringing by choosing a proper width of the first slot (the slot nearest to the feedpoint) and a proper distance between the feedpoint and the first slot. If the feedpoint-first slot distance is sufficiently small, the radiated pulse is a superposition of two different pulses radiated from the feedpoint and the first slot. These two pulses merge into a single pulse having a maximum amplitude which is higher than the maximum amplitude of the pulse radiated from a bowtie antenna according to the prior art .
  • the bowtie antenna according to the invention has a high radiation efficiency and is capable of radiating temporally short pulses with a very small level of late-time ringing .
  • the bowtie antenna is constructed with the slot closest to the feedpoint having a distance with respect to said feedpoint equal to approximately one fourth of the center wavelength of the radiated energy.
  • the maximum amplitude of the radiated pulse is almost two times higher than the maximum amplitude of the radiated pulse from a bowtie antenna according to the prior art .
  • the slot closest to the feedpoint has a distance with respect to said feedpoint equal to approximately 0.4 times the center wavelength of the radiated energy, and wherein the width of said slot equals approximately 0.008 times the said center wavelength.
  • the level of the late-time ringing in this case is lower than -40 dB as compared to the maximum amplitude .
  • Fig. 4 schematically shows the bowtie antenna according to a preferred embodiment in exploded view.
  • the bowtie antenna 1 comprises a feedpoint 2 for radiating energy and flat mutually opposing arms 3 and 4 that in use radiate at least part of the energy supplied at the feedpoint 2.
  • the feedpoint 2 is positioned in between the said arms 3 and 4.
  • Each of the arms 3 and 4 comprises a carrier in the form of a substrate and electrically conductive elements, for instance copper elements attached to the carrier. This is realised such that each of the arms 3 and 4 has a series of electrically conductive elements that are separated from each other at predetermined distances so as to define slots between neighbouring elements, the result being that both arms 3 and 4 are provided with surfaces having alternating slots and conductive elements.
  • the heart-to-heart distance of neighbouring elements is the same for all elements equalling approximately 0.02 times the center wavelength of the radiated energy.
  • each of the slots has a width that depends on its distance from the feedpoint 2, such that the width of neighbouring slots increases proportionally with their distance with respect to the feedpoint 2.
  • the position of the first slots 5 and 6 in each of the arms 3 and 4 is indicated.
  • the distance of the slots 5 and 6 with respect to the feedpoint 2 preferably equals to approximately 0.4 times the center wavelength of the radiated energy and the width of this closest slot equalling approximately 0.008 times the center wavelength of the radiated energy.
  • the surfaces of the arms 3 and 4 to which the alternating slots and conductive elements are applied, is covered by a layer of absorbing material 7 and 8 having the function to absorb the energy radiated from the slots.
  • Fig. 2 the results of the bowtie antenna in respect of the time-domain response are shown in a normalized graph with respect to the time-domain (x-axis) and the amplitude (y-axis) .
  • the time-domain response of the bowtie antenna when fed by an input pulse at its feedpoint is shown in a solid line.
  • the same Figure shows in a dashed line the response resulting from a bowtie antenna according to the prior art .
  • Fig. 3 the receiving sensitivity of the bowtie antenna according to the invention is shown in a solid line, and the receiving sensitivity of a bowtie antenna according to the prior art in a dashed line.
  • the x-axis shows the normalized exciting frequency.
  • the frequency scale is normalized with respect to the center frequency of the input pulse fed to the feedpoint of the bowtie antenna.
  • the y-axis shows in dB the receiving sensitivity of both antennas.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)

Abstract

Cette antenne en forme de noeud papillon comprend un point d'alimentation, à partir duquel rayonne l'énergie, ainsi que des bras opposés qui, lors de leur utilisation, rayonnent au moins une partie de l'énergie fournie au niveau du point d'alimentation, lequel est placé entre les deux bras. Chaque bras comprend un support et un élément électroconducteur, attaché au support, ainsi qu'une série d'éléments électroconducteurs fixés au support et séparés les uns des autres selon des distances déterminées, de manière à définir des fentes entre éléments voisins.
PCT/NL2001/000098 2000-02-15 2001-02-06 Antenne en forme de noeud papillon WO2001061784A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001236189A AU2001236189A1 (en) 2000-02-15 2001-02-06 Bowtie antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1014383A NL1014383C2 (nl) 2000-02-15 2000-02-15 Vlinderdasantenne.
NL1014383 2000-02-15

Publications (1)

Publication Number Publication Date
WO2001061784A1 true WO2001061784A1 (fr) 2001-08-23

Family

ID=19770818

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2001/000098 WO2001061784A1 (fr) 2000-02-15 2001-02-06 Antenne en forme de noeud papillon

Country Status (3)

Country Link
AU (1) AU2001236189A1 (fr)
NL (1) NL1014383C2 (fr)
WO (1) WO2001061784A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2408150B (en) * 2003-10-24 2007-02-14 Ykc Corp Ultra-wideband antenna and ultrahigh frequency circuit module
EP2764573A4 (fr) * 2011-10-07 2015-12-16 3D Radar As Antenne de radar pénétrant
US9843101B2 (en) 2014-01-30 2017-12-12 3D-Radar As Antenna system for ground penetrating radar
US9843102B2 (en) 2014-11-14 2017-12-12 City University Of Hong Kong Shorted bowtie patch antenna with parasitic shorted patches

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5229777A (en) * 1991-11-04 1993-07-20 Doyle David W Microstrap antenna

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5229777A (en) * 1991-11-04 1993-07-20 Doyle David W Microstrap antenna

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
CLAPP R E: "A RESISTIVELY LOADED, PRINTED CIRCUIT, ELECTRICALLY SHORT DIPOLE ELEMENT FOR WIDEBAND ARRAY APPLICATIONS", PROCEEDINGS OF THE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSIS),US,NEW YORK, IEEE, vol. -, 28 June 1993 (1993-06-28), pages 478 - 481, XP000420083 *
J F ZÜRCHER AND F E GARDIOL: "Broadband Patch Antennas", THE ARTECH HOUSE ANTENNA LIBRARY,US,BOSTON, MA, ARTECH HOUSE, 1995, pages 39, XP002148425, ISBN: 0-89006-777-5 *
NISHIOKA Y ET AL: "FDTD ANALYSIS OF RESISTOR-LOADED BOW-TIE ANTENNAS COVERED WITH FERRITE-COATED CONDUCTING CAVITY FOR SUBSURFACE RADAR", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION,US,IEEE INC. NEW YORK, vol. 47, no. 6, June 1999 (1999-06-01), pages 970 - 976, XP000845946, ISSN: 0018-926X *
SHLAGER K L ET AL: "OPTIMIZATION OF BOW-TIE ANTENNAS FOR PULSE RADIATION", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION,US,IEEE INC. NEW YORK, vol. 42, no. 7, 1 July 1994 (1994-07-01), pages 975 - 982, XP000457524, ISSN: 0018-926X *
WONG K -L ET AL: "SLOT-LOADED BOW-TIE MICROSTRIP ANTENNA FOR DUAL-FREQUENCY OPERATION", JOURNAL OF PHARMACEUTICAL SCIENCES,US,AMERICAN PHARMACEUTICAL ASSOCIATION. WASHINGTON, vol. 88, no. 11, November 1999 (1999-11-01), pages 1713 - 1714, XP000853352, ISSN: 0022-3549 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2408150B (en) * 2003-10-24 2007-02-14 Ykc Corp Ultra-wideband antenna and ultrahigh frequency circuit module
US7265717B2 (en) 2003-10-24 2007-09-04 Ykc Corporation Ultra-wideband antenna and ultrahigh frequency circuit module
EP2764573A4 (fr) * 2011-10-07 2015-12-16 3D Radar As Antenne de radar pénétrant
US9478872B2 (en) 2011-10-07 2016-10-25 3D-Radar As Ground penetrating radar antenna
US9843101B2 (en) 2014-01-30 2017-12-12 3D-Radar As Antenna system for ground penetrating radar
US9843102B2 (en) 2014-11-14 2017-12-12 City University Of Hong Kong Shorted bowtie patch antenna with parasitic shorted patches

Also Published As

Publication number Publication date
AU2001236189A1 (en) 2001-08-27
NL1014383C2 (nl) 2001-08-16

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