WO2003052874A1 - Nrd guide te mode antenna system - Google Patents

Nrd guide te mode antenna system Download PDF

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Publication number
WO2003052874A1
WO2003052874A1 PCT/KR2002/000197 KR0200197W WO03052874A1 WO 2003052874 A1 WO2003052874 A1 WO 2003052874A1 KR 0200197 W KR0200197 W KR 0200197W WO 03052874 A1 WO03052874 A1 WO 03052874A1
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WO
WIPO (PCT)
Prior art keywords
mode
lsm
millimeter waves
suppressor
nrd guide
Prior art date
Application number
PCT/KR2002/000197
Other languages
French (fr)
Inventor
Cheon Woo Shin
Original Assignee
Nrdtech Co., Ltd
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 Nrdtech Co., Ltd filed Critical Nrdtech Co., Ltd
Priority to AU2002233770A priority Critical patent/AU2002233770A1/en
Publication of WO2003052874A1 publication Critical patent/WO2003052874A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/24—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave constituted by a dielectric or ferromagnetic rod or pipe
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/28—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave comprising elements constituting electric discontinuities and spaced in direction of wave propagation, e.g. dielectric elements or conductive elements forming artificial dielectric
    • 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
    • H01Q9/0485—Dielectric resonator antennas

Definitions

  • the present invention relates to Non-Radiative Dielectric waveGuide (NRD Guide) TE mode antenna systems using NRD Guides.
  • NRD Guide Non-Radiative Dielectric waveGuide
  • the NRD Guide has a structure that a distance between parallel conducting plates is below a half wavelength of the frequency to be used and dielectric strips are inserted in between the two parallel conducting plates. Electromagnetic waves are transmitted through the dielectric strips.
  • the NRD Guide attracts interests as a transmission line in millimeter wave band over 30GHz because transmission loss of the NRD Guide is lower than that of microstriplines due to high non-radiativeness of wave propagated through dielectrics and production and composition of the NRD Guide circuit are simpler than those of waveguides.
  • the present invention provides NRD Guide TE mode antenna systems using the NRD Guide.
  • LSE and LSM modes are general modes of the wave propagated through the NRD Guide. Between these, LSM mode is generally used in NRD
  • millimeter waves of LSM mode is converted into millimeter waves of TE mode and the millimeter waves of TE mode are radiated through the related art rod antenna.
  • the NRD Guide TE mode antenna system is implemented by aligning Teflon blocks 301, 302, 303, 304, a TE mode suppressor 401, a mode converter 501 and a vertical LSM mode suppressor 601 in between upper/lower conducting plates 101, 201 and by fixing a rod antenna 701 on the part protruded from the upper/lower conducting plates 101, 201.
  • the NRD Guide TE mode antenna system is implemented by aligning the Teflon blocks 301, 302, 303, the TE mode suppressor 401, the mode converter 501 and a horizontal LSM mode suppressor 602 in between the upper/lower conducting plates 101, 201 and by fixing the rod antenna 701 on the part protruded from the upper/lower conducting plates 101, 201.
  • the present invention implements a new antenna system by converting LSM mode mainly used between LSE and LSM mode of NRD Guide into TE mode and by fixing a rod antenna, which is used in related art NRD Guide and system, on the part protruded from upper/lower conducting plates.
  • FIG. 1 is a block diagram illustrating a new type of NRD Guide TE mode antenna system according to the present invention. Millimeter waves of LSM mode are transmitted, through the first Teflon block 301 and the TE mode suppressor 401, to the second Teflon block 302.
  • the TE mode suppressor 401 plays a role in passing only LSM mode through the first Teflon block 301.
  • millimeter waves of various modes and unnecessary waves, that occurs during mode conversion process at the mode converter 501 next to the second Teflon block 302, from returning to an input terminal is the most important role of the TE mode suppressor 401.
  • the mode converter 501 next to the second Teflon block 302 converts LSM mode into TE mode.
  • the converted millimeter waves are transmitted through the third Teflon block 303 to the LSM mode suppressor 601 , 602.
  • LSM mode and other modes may occur. Unnecessary mode and LSM mode that occur due to the incomplete conversion at the mode converter 501 mostly disappears and are suppressed by the LSM mode suppressor 601, 602.
  • TE mode that occurs through the mode conversion is radiated through the rod antenna 701 to the outside.
  • Figure 1 is a block diagram that illustrates an NRD Guide TE mode antenna system.
  • Figure 2 illustrates a perspective view of the NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
  • Figure 3 illustrates a perspective view of the disassembled NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
  • Figure 4 illustrates a perspective view of the TE mode suppressor used in the first and second preferred embodiments of the present invention.
  • Figure 5 illustrates a perspective view of the mode converter used in the first and second preferred embodiments of the present invention.
  • Figure 6 illustrates a perspective view of the vertical LSM mode suppressor used in the first preferred embodiment of the present invention.
  • Figure 7 illustrates an operational principle of the NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
  • Figure 8 illustrates a perspective view of the NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
  • Figure 9 illustrates a perspective view of the disassembled NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
  • Figure 10 illustrates a perspective view of the horizontal LSM mode suppressor used in the second preferred embodiment of the present invention.
  • Figure 11 illustrates an operational principle of the NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
  • Figure 12 illustrates an E-plane radiation pattern of the NRD Guide TE mode antenna system according to the first and second preferred embodiments of the present invention.
  • Figure 13 illustrates an H-plane radiation pattern of the NRD Guide TE mode antenna system according to the first and second preferred embodiments of the present invention.
  • Dielectric Strip Block 401 TE Mode Suppressor 501 : Mode Converter 601: Vertical LSM Mode Suppressor 602: Horizontal LSM Mode Suppressor 701 : Rod Antenna
  • FIG. 2 illustrates a perspective view of the first preferred embodiment of the present invention.
  • the NRD Guide circuit has a structure that a Teflon block 301, a TE mode suppressor 401, a Teflon block 302, a mode converter 501, a Teflon block 303, a vertical LSM mode suppressor 601 and a Teflon block 304 are aligned according to the order of listed herein in between parallel upper/lower conducting plates 101, 201.
  • LSM mode the main mode of NRD Guide, is converted into TE mode.
  • the rod antenna 701 is made of the material having the same characteristics as Teflon blocks used in NRD Guide circuit. By decreasing the width of Teflon block, it is made possible for rod antenna to radiate wave as an antenna.
  • the present invention intends to implement system for 60GHz band so that a distance between the upper/lower conducting plates 101, 201, the height of Teflon blocks and the height of all components is 2.25mm and the width of all components except the rod antenna is 2.5mm.
  • rod antenna has the same width of Teflon block at the boundary of rod antenna and TE mode output terminal of NRD Guide. The width of the rod antenna decreases gradually as closer to the ending point.
  • the length of the antenna of the present invention is 40mm assuring the efficiency of rod antenna.
  • FIG. 3 illustrates a perspective view of the disassembled NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
  • Teflon blocks are made of the same materials but have different size depending on the location of being inserted.
  • the first Teflon block 301 is an input terminal of millimeter waves of LSM mode and the fourth Teflon block 304 is an output terminal of millimeter waves converted from LSM mode to TE mode through NRD Guide conversion circuit.
  • the output terminal is in contact with the rod antenna 701.
  • the second Teflon block 302 is inserted in between the TE mode suppressor 401 and the mode converter 501. Millimeter waves of LSM mode that passed through the TE mode suppressor 401 is converted into millimeter waves of TE mode at the mode converter 501. However, millimeter waves that passed through the conversion process are not completely transmitted into the next and a little portion of the millimeter waves return to the input terminal due to reflection. Millimeter waves of TE mode that return to the input terminal due to reflection may be blocked by the TE mode suppressor 401.
  • the second Teflon block is made to have the length equivalent to a quarter of the wavelength of TE mode so that the millimeter waves of TE mode that return to the input terminal disappear.
  • the third Teflon block 303 is inserted in between the mode converter 501 and the vertical LSM mode suppressor 601. Millimeter waves of TE mode converted by the mode converter 501 and a little millimeter waves of LSM mode enter the third Teflon block 303.
  • the vertical LSM mode suppressor 601 is inserted and suppresses millimeter waves of LSM mode among the complex millimeter waves and makes only millimeter waves of TE mode be transmitted into the antenna.
  • LSM mode may disappear at the vertical LSM mode suppressor 601, however, there are millimeter waves of LSM mode that return to the mode converter 501 due to reflection.
  • the third Teflon block 303 inserted in between the mode converter 501 and the vertical LSM mode suppressor 601 is made to have the length equivalent to a quarter of the wavelength of LSM mode in order to make millimeter waves of LSM mode disappear.
  • Figure 4 illustrates a perspective view of the TE mode suppressor 401.
  • the metal strips constituting the metal pattern are formed in a direction perpendicular to the upper and the lower conducting plates 101, 201 and aligned as illustrated in Figure 4.
  • the dielectric substrate has a permittivity of 2.56 and a thickness of 0.3mm.
  • the dielectric substrate is used for the mode converter 501, the vertical LSM mode suppressor 601 and the horizontal LSM mode suppressor 602 of the second preferred embodiment of the present invention.
  • the present invention provides the TE mode suppressor 401 for millimeter waves of 60GHz range.
  • the width of the metal strip is 0.05mm and the distance between the each metal strips is 0.15mm. Further, the distance between the edge of the dielectric substrate and the metal strips is 0.1mm in vertical direction.
  • FIG. 5 illustrates a perspective view of the mode converter 501.
  • the dielectric substrate for mode conversion is composed by aligning metal patterns in the shape of " ⁇ " and " L -" diagonally.
  • the width of metal pattern is 0.2mm and the width of the bending strip is 0.1mm. Further, the distance between the each bending strips is 0.1mm.
  • Figure 6 illustrates a perspective view of the vertical LSM mode suppressor 601.
  • LSM mode is almost parallel with the upper/lower conducting plates 101, 201 of which electric field is parallel.
  • metal strips constituting the metal pattern are formed in a direction perpendicular to the upper and the lower conducting plates 101, 201 and aligned as illustrated in Figure 6.
  • a width of the metal strip is 0.05mm and a length of the metal strip is 2.3mm.
  • a distance between the each metal strips is 0.15mm.
  • Figure 7 illustrates a process of transmitting millimeter waves of various modes in each parts of the NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
  • millimeter waves of LSM mode are inputted into the first Teflon block 301. If the inputted millimeter waves include TE mode in addition to LSM mode, millimeter waves of TE mode are blocked by the TE mode suppressor 401. The inputted millimeter waves pass through the TE mode suppressor 401. And, most of them are converted into TE mode at the mode converter 501 and are transmitted into the third Teflon block 303.
  • millimeter waves of TE mode not transmitted into the third Teflon block and reflected to the second Teflon block, disappear at the second Teflon block 302 which has a length equivalent to a quarter of wavelength of TE mode and the millimeter waves of TE mode are blocked by the TE mode suppressor 401.
  • Millimeter waves that passed through the mode converter 501 are mostly TE mode but include a little LSM mode.
  • a vertical LSM mode suppressor 601 is inserted in order to block millimeter waves of LSM mode.
  • a little portion of millimeter waves of LSM mode are reflected by the vertical LSM mode suppressor 601.
  • the millimeter waves of LSM mode disappear at the third Teflon block 303 which has a length equivalent to a quarter of wavelength of LSM mode.
  • Millimeter waves of TE mode are transmitted through processes like above into the rod antenna 701.
  • FIG. 8 illustrates a perspective view of the NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
  • the NRD Guide circuit has a structure that a Teflon block 301, a TE mode suppressor 401, a Teflon block 302, a mode converter 501, a Teflon block 303 and a horizontal LSM mode suppressor 602 are aligned according to the order of listed herein in between parallel upper/lower conducting plates 101, 201.
  • LSM mode the main mode of NRD Guide
  • Millimeter waves converted into TE mode are transmitted to the rod antenna
  • FIG 9 illustrates a perspective view of the disassembled NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
  • Teflon blocks are made of the same materials but have different size depending on the location of the each Teflon blocks.
  • the first Teflon block 301 is an input terminal of millimeter waves of LSM mode and the fourth Teflon block 304 is an output terminal of millimeter waves converted from LSM mode to TE mode through NRD Guide converting circuit.
  • the output terminal is in contact with the rod antenna 701.
  • the system according to the second preferred embodiment is composed like the first preferred embodiment except that horizontal LSM mode suppressor 602 is substituted for vertical LSM mode suppressor 601 of the first preferred embodiment and the fourth Teflon block 304 is removed.
  • horizontal LSM mode suppressor 602 is substituted for vertical LSM mode suppressor 601 of the first preferred embodiment and the fourth Teflon block 304 is removed.
  • FIG 10 illustrates a perspective view of horizontal LSM mode suppressor 602.
  • LSM mode is almost parallel with upper/lower conducting plates 101, 201 of which electric field is parallel.
  • metal plate is inserted in the middle of dielectric strip, that is Teflon block, being parallel with upper/lower conducting plates.
  • a thickness of the metal plate is 0.0175mm and a width of the metal plate is 2.1mm.
  • a length of the metal plate is 2.4mm.
  • Figure 11 illustrates a process of transmitting millimeter waves of various modes in each parts of the NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
  • millimeter waves of LSM mode are inputted into the first Teflon block 301. If the inputted millimeter waves include TE mode in addition to LSM mode, millimeter waves of TE mode are blocked by the TE mode suppressor 401. The inputted millimeter waves pass through the TE mode suppressor 401. And, most of them are converted into TE mode at the mode converter 501 and are transmitted into the third Teflon block 303.
  • millimeter waves of TE mode not transmitted into the third Teflon block and reflected to the second Teflon block, disappear at the second Teflon block 302 which has a length equivalent to a quarter of wavelength of TE mode and the millimeter waves of TE mode are blocked by the TE mode suppressor 401.
  • Millimeter waves that passed through the mode converter 501 are mostly TE mode but include a little LSM mode.
  • a horizontal LSM mode suppressor 602 is inserted in order to block millimeter waves of LSM mode.
  • Millimeter waves of LSM mode disappear at the third Teflon block 303 which has a length equivalent to a quarter of wavelength of LSM mode.
  • Millimeter waves of TE mode are transmitted through processes like above into the rod antenna 701.
  • Figures 12 and 13 illustrate an E-plane and H-plane radiation pattern of the
  • the NRD Guide TE mode antenna system may substitute an NRD Guide antenna for an antenna of microwave band, such as a microstrip, a waveguide and etc. Further, production cost is reduced due to simple manufacturing process of the NRD Guide TE mode antenna system and productivity is heighten by reducing production process so that the NRD Guide TE mode antenna system may be an antenna system which may be widely used in millimeter wave band.

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Abstract

The present invention provides an NRD guide TE mode antenna system which has the TE mode by using an NRD guide. The general modes of electric wave transmitted through an NRD guide are LSE and LSM modes. Here, the LSM mode is mostly used in the NRD guide. Accordingly, the present invention causes the LSM mode to be converted into a TE mode and enables the electric wave to be radiated through a rod antenna which is used in the prior art.

Description

NRD GUIDE TE MODE ANTENNA SYSTEM
TECHNICAL FIELD
The present invention relates to Non-Radiative Dielectric waveGuide (NRD Guide) TE mode antenna systems using NRD Guides.
BACKGROUND ART
The NRD Guide has a structure that a distance between parallel conducting plates is below a half wavelength of the frequency to be used and dielectric strips are inserted in between the two parallel conducting plates. Electromagnetic waves are transmitted through the dielectric strips.
The NRD Guide attracts interests as a transmission line in millimeter wave band over 30GHz because transmission loss of the NRD Guide is lower than that of microstriplines due to high non-radiativeness of wave propagated through dielectrics and production and composition of the NRD Guide circuit are simpler than those of waveguides.
As techniques using the NRD Guide in millimeter wave band are widely used, interests about antenna, not to speak of NRD Guide circuit, have been increased.
DISCLOSURE OF THE INVENTION
The present invention provides NRD Guide TE mode antenna systems using the NRD Guide. LSE and LSM modes are general modes of the wave propagated through the NRD Guide. Between these, LSM mode is generally used in NRD
Guide. Thus, millimeter waves of LSM mode is converted into millimeter waves of TE mode and the millimeter waves of TE mode are radiated through the related art rod antenna.
The NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention is implemented by aligning Teflon blocks 301, 302, 303, 304, a TE mode suppressor 401, a mode converter 501 and a vertical LSM mode suppressor 601 in between upper/lower conducting plates 101, 201 and by fixing a rod antenna 701 on the part protruded from the upper/lower conducting plates 101, 201.
The NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention is implemented by aligning the Teflon blocks 301, 302, 303, the TE mode suppressor 401, the mode converter 501 and a horizontal LSM mode suppressor 602 in between the upper/lower conducting plates 101, 201 and by fixing the rod antenna 701 on the part protruded from the upper/lower conducting plates 101, 201.
The present invention implements a new antenna system by converting LSM mode mainly used between LSE and LSM mode of NRD Guide into TE mode and by fixing a rod antenna, which is used in related art NRD Guide and system, on the part protruded from upper/lower conducting plates.
Figure 1 is a block diagram illustrating a new type of NRD Guide TE mode antenna system according to the present invention. Millimeter waves of LSM mode are transmitted, through the first Teflon block 301 and the TE mode suppressor 401, to the second Teflon block 302.
At this time, the TE mode suppressor 401 plays a role in passing only LSM mode through the first Teflon block 301. However, preventing millimeter waves of various modes and unnecessary waves, that occurs during mode conversion process at the mode converter 501 next to the second Teflon block 302, from returning to an input terminal is the most important role of the TE mode suppressor 401.
The mode converter 501 next to the second Teflon block 302 converts LSM mode into TE mode. The converted millimeter waves are transmitted through the third Teflon block 303 to the LSM mode suppressor 601 , 602.
Because it is not that LSM mode is completely converted into TE mode through the mode converter 501, not to mention TE mode, LSM mode and other modes may occur. Unnecessary mode and LSM mode that occur due to the incomplete conversion at the mode converter 501 mostly disappears and are suppressed by the LSM mode suppressor 601, 602.
TE mode that occurs through the mode conversion is radiated through the rod antenna 701 to the outside.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram that illustrates an NRD Guide TE mode antenna system.
Figure 2 illustrates a perspective view of the NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
Figure 3 illustrates a perspective view of the disassembled NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
Figure 4 illustrates a perspective view of the TE mode suppressor used in the first and second preferred embodiments of the present invention.
Figure 5 illustrates a perspective view of the mode converter used in the first and second preferred embodiments of the present invention.
Figure 6 illustrates a perspective view of the vertical LSM mode suppressor used in the first preferred embodiment of the present invention.
Figure 7 illustrates an operational principle of the NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
Figure 8 illustrates a perspective view of the NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
Figure 9 illustrates a perspective view of the disassembled NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
Figure 10 illustrates a perspective view of the horizontal LSM mode suppressor used in the second preferred embodiment of the present invention.
Figure 11 illustrates an operational principle of the NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention.
Figure 12 illustrates an E-plane radiation pattern of the NRD Guide TE mode antenna system according to the first and second preferred embodiments of the present invention.
Figure 13 illustrates an H-plane radiation pattern of the NRD Guide TE mode antenna system according to the first and second preferred embodiments of the present invention.
**Description of the codes at important parts of diagrams**
101, 102: Upper/Lower Conducting Plate
301, 302, 303, 304: Dielectric Strip Block 401 : TE Mode Suppressor 501 : Mode Converter 601: Vertical LSM Mode Suppressor 602: Horizontal LSM Mode Suppressor 701 : Rod Antenna
BEST MODES FOR CARRYING OUT THE INVENTION
(First preferred embodiment)
Figure 2 illustrates a perspective view of the first preferred embodiment of the present invention. The NRD Guide circuit has a structure that a Teflon block 301, a TE mode suppressor 401, a Teflon block 302, a mode converter 501, a Teflon block 303, a vertical LSM mode suppressor 601 and a Teflon block 304 are aligned according to the order of listed herein in between parallel upper/lower conducting plates 101, 201. Through the NRD Guide circuit, LSM mode, the main mode of NRD Guide, is converted into TE mode.
Millimeter waves, converted into TE mode, are transmitted to the rod antenna 701 and radiated. The rod antenna 701 is made of the material having the same characteristics as Teflon blocks used in NRD Guide circuit. By decreasing the width of Teflon block, it is made possible for rod antenna to radiate wave as an antenna. The present invention intends to implement system for 60GHz band so that a distance between the upper/lower conducting plates 101, 201, the height of Teflon blocks and the height of all components is 2.25mm and the width of all components except the rod antenna is 2.5mm. And, rod antenna has the same width of Teflon block at the boundary of rod antenna and TE mode output terminal of NRD Guide. The width of the rod antenna decreases gradually as closer to the ending point. The length of the antenna of the present invention is 40mm assuring the efficiency of rod antenna.
Figure 3 illustrates a perspective view of the disassembled NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention. Teflon blocks are made of the same materials but have different size depending on the location of being inserted. The first Teflon block 301 is an input terminal of millimeter waves of LSM mode and the fourth Teflon block 304 is an output terminal of millimeter waves converted from LSM mode to TE mode through NRD Guide conversion circuit. The output terminal is in contact with the rod antenna 701. Thus, an explanation about the length of the first Teflon block and the fourth block 301, 304 will be omitted and an explanation will be given as to the length of the second and third Teflon blocks 302, 303.
The second Teflon block 302 is inserted in between the TE mode suppressor 401 and the mode converter 501. Millimeter waves of LSM mode that passed through the TE mode suppressor 401 is converted into millimeter waves of TE mode at the mode converter 501. However, millimeter waves that passed through the conversion process are not completely transmitted into the next and a little portion of the millimeter waves return to the input terminal due to reflection. Millimeter waves of TE mode that return to the input terminal due to reflection may be blocked by the TE mode suppressor 401. In addition to the TE mode suppressor, the second Teflon block is made to have the length equivalent to a quarter of the wavelength of TE mode so that the millimeter waves of TE mode that return to the input terminal disappear. The third Teflon block 303 is inserted in between the mode converter 501 and the vertical LSM mode suppressor 601. Millimeter waves of TE mode converted by the mode converter 501 and a little millimeter waves of LSM mode enter the third Teflon block 303. Thus, the vertical LSM mode suppressor 601 is inserted and suppresses millimeter waves of LSM mode among the complex millimeter waves and makes only millimeter waves of TE mode be transmitted into the antenna. LSM mode may disappear at the vertical LSM mode suppressor 601, however, there are millimeter waves of LSM mode that return to the mode converter 501 due to reflection. Thus, the third Teflon block 303 inserted in between the mode converter 501 and the vertical LSM mode suppressor 601 is made to have the length equivalent to a quarter of the wavelength of LSM mode in order to make millimeter waves of LSM mode disappear.
Figure 4 illustrates a perspective view of the TE mode suppressor 401. The metal strips constituting the metal pattern are formed in a direction perpendicular to the upper and the lower conducting plates 101, 201 and aligned as illustrated in Figure 4. The dielectric substrate has a permittivity of 2.56 and a thickness of 0.3mm. The dielectric substrate is used for the mode converter 501, the vertical LSM mode suppressor 601 and the horizontal LSM mode suppressor 602 of the second preferred embodiment of the present invention. The present invention provides the TE mode suppressor 401 for millimeter waves of 60GHz range. The width of the metal strip is 0.05mm and the distance between the each metal strips is 0.15mm. Further, the distance between the edge of the dielectric substrate and the metal strips is 0.1mm in vertical direction. The length of the strip is 2.05mm. Figure 5 illustrates a perspective view of the mode converter 501. The dielectric substrate for mode conversion is composed by aligning metal patterns in the shape of "π " and "L-" diagonally. The width of metal pattern is 0.2mm and the width of the bending strip is 0.1mm. Further, the distance between the each bending strips is 0.1mm. These size and shape of the metal pattern are based on "Korean Patent Application No. 10-2001-008327".
Figure 6 illustrates a perspective view of the vertical LSM mode suppressor 601. LSM mode is almost parallel with the upper/lower conducting plates 101, 201 of which electric field is parallel. Thus, in order to block millimeter waves of LSM mode, metal strips constituting the metal pattern are formed in a direction perpendicular to the upper and the lower conducting plates 101, 201 and aligned as illustrated in Figure 6. At this time, a width of the metal strip is 0.05mm and a length of the metal strip is 2.3mm. Further, a distance between the each metal strips is 0.15mm. Figure 7 illustrates a process of transmitting millimeter waves of various modes in each parts of the NRD Guide TE mode antenna system according to the first preferred embodiment of the present invention.
Firstly, millimeter waves of LSM mode are inputted into the first Teflon block 301. If the inputted millimeter waves include TE mode in addition to LSM mode, millimeter waves of TE mode are blocked by the TE mode suppressor 401. The inputted millimeter waves pass through the TE mode suppressor 401. And, most of them are converted into TE mode at the mode converter 501 and are transmitted into the third Teflon block 303. However, millimeter waves of TE mode, not transmitted into the third Teflon block and reflected to the second Teflon block, disappear at the second Teflon block 302 which has a length equivalent to a quarter of wavelength of TE mode and the millimeter waves of TE mode are blocked by the TE mode suppressor 401.
Millimeter waves that passed through the mode converter 501 are mostly TE mode but include a little LSM mode. Thus, in order to block millimeter waves of LSM mode, a vertical LSM mode suppressor 601 is inserted. However, a little portion of millimeter waves of LSM mode are reflected by the vertical LSM mode suppressor 601. The millimeter waves of LSM mode disappear at the third Teflon block 303 which has a length equivalent to a quarter of wavelength of LSM mode. Millimeter waves of TE mode are transmitted through processes like above into the rod antenna 701.
(Second preferred embodiment) Figure 8 illustrates a perspective view of the NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention. The NRD Guide circuit has a structure that a Teflon block 301, a TE mode suppressor 401, a Teflon block 302, a mode converter 501, a Teflon block 303 and a horizontal LSM mode suppressor 602 are aligned according to the order of listed herein in between parallel upper/lower conducting plates 101, 201. Through the NRD Guide circuit, LSM mode, the main mode of NRD Guide, is converted into TE mode. Millimeter waves converted into TE mode are transmitted to the rod antenna
701 and radiated.
Figure 9 illustrates a perspective view of the disassembled NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention. Teflon blocks are made of the same materials but have different size depending on the location of the each Teflon blocks. The first Teflon block 301 is an input terminal of millimeter waves of LSM mode and the fourth Teflon block 304 is an output terminal of millimeter waves converted from LSM mode to TE mode through NRD Guide converting circuit. The output terminal is in contact with the rod antenna 701.
The system according to the second preferred embodiment is composed like the first preferred embodiment except that horizontal LSM mode suppressor 602 is substituted for vertical LSM mode suppressor 601 of the first preferred embodiment and the fourth Teflon block 304 is removed. Thus, a detailed explanation will be given as to the horizontal LSM mode suppressor 602 and the overall operational principle.
Figure 10 illustrates a perspective view of horizontal LSM mode suppressor 602. LSM mode is almost parallel with upper/lower conducting plates 101, 201 of which electric field is parallel. Thus, in order to block millimeter waves of the LSM mode, metal plate is inserted in the middle of dielectric strip, that is Teflon block, being parallel with upper/lower conducting plates. At this time, a thickness of the metal plate is 0.0175mm and a width of the metal plate is 2.1mm. Further, a length of the metal plate is 2.4mm.
Figure 11 illustrates a process of transmitting millimeter waves of various modes in each parts of the NRD Guide TE mode antenna system according to the second preferred embodiment of the present invention. Firstly, millimeter waves of LSM mode are inputted into the first Teflon block 301. If the inputted millimeter waves include TE mode in addition to LSM mode, millimeter waves of TE mode are blocked by the TE mode suppressor 401. The inputted millimeter waves pass through the TE mode suppressor 401. And, most of them are converted into TE mode at the mode converter 501 and are transmitted into the third Teflon block 303. However, millimeter waves of TE mode, not transmitted into the third Teflon block and reflected to the second Teflon block, disappear at the second Teflon block 302 which has a length equivalent to a quarter of wavelength of TE mode and the millimeter waves of TE mode are blocked by the TE mode suppressor 401.
Millimeter waves that passed through the mode converter 501 are mostly TE mode but include a little LSM mode. Thus, in order to block millimeter waves of LSM mode, a horizontal LSM mode suppressor 602 is inserted. However, a little portion of millimeter waves of LSM mode are reflected by the horizontal LSM mode suppressor 602. Millimeter waves of LSM mode disappear at the third Teflon block 303 which has a length equivalent to a quarter of wavelength of LSM mode.
Millimeter waves of TE mode are transmitted through processes like above into the rod antenna 701. Figures 12 and 13 illustrate an E-plane and H-plane radiation pattern of the
NRD Guide antenna system according to the preferred embodiments of the present invention. From Figures 12 and 13, it is found that an antenna gain is 16.5dB and beam is formed in the direction of a rod antenna 701 (direction of wave's propagation, φ=0°, θ=90°) . At this time, Half Power Beam Width (HPB W) is about 10° .
INDUSTRIAL APPLICABILITY
The NRD Guide TE mode antenna system according to the present invention may substitute an NRD Guide antenna for an antenna of microwave band, such as a microstrip, a waveguide and etc. Further, production cost is reduced due to simple manufacturing process of the NRD Guide TE mode antenna system and productivity is heighten by reducing production process so that the NRD Guide TE mode antenna system may be an antenna system which may be widely used in millimeter wave band.

Claims

WHAT IS CLAIMED IS:
1. An NRD Guide TE mode antenna system comprising: a first Teflon block in which millimeter waves of LSM mode is inputted; a TE mode suppressor for blocking inputted millimeter waves of TE mode and millimeter waves of TE mode reflected from a mode converter; a second Teflon block which has a length equivalent to a quarter of wavelength of millimeter waves of TE mode in order to make TE mode reflected from the mode converter disappear; the mode converter that converts LSM mode into TE mode; a third Teflon block which has a length equivalent to a quarter of wavelength of millimeter waves of LSM mode in order to make LSM mode reflected from a vertical LSM mode suppressor disappear; the vertical LSM mode suppressor for blocking LSM mode included in millimeter waves converted by the mode converter; a fourth Teflon block for connecting the vertical LSM mode suppressor with a rod antenna; and the rod antenna, fixed on the part protruded from upper/lower conducting plates, for radiating millimeter waves of TE mode, in between parallel upper/lower conducting plates, obtaining a desirable gain and having good radiation characteristics.
2. An NRD Guide TE mode antenna system comprising: a first Teflon block in which millimeter waves of LSM mode is inputted; a TE mode suppressor for blocking inputted millimeter waves of TE mode and millimeter waves of TE mode reflected from a mode converter; a second Teflon block which has a length equivalent to a quarter of wavelength of millimeter waves of TE mode in order to make TE mode reflected from the mode converter disappear; the mode converter that converts LSM mode into TE mode; a third Teflon block which has a length equivalent to a quarter of wavelength of millimeter waves of LSM mode in order to make LSM mode reflected from a horizontal LSM mode suppressor disappear; the horizontal LSM mode suppressor for blocking LSM mode included in millimeter waves converted by the mode converter; and a rod antenna, fixed on the part protruded from upper/lower conducting plates, for radiating millimeter waves of TE mode, in between parallel upper/lower conducting plates, obtaining a desirable gain and having good radiation characteristics.
PCT/KR2002/000197 2001-12-14 2002-02-07 Nrd guide te mode antenna system WO2003052874A1 (en)

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AU2002233770A AU2002233770A1 (en) 2001-12-14 2002-02-07 Nrd guide te mode antenna system

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KR1020010079192A KR100333133B1 (en) 2001-12-14 2001-12-14 NRD Guide TE Mode Antenna System
KR2001/79192 2001-12-14

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09148842A (en) * 1995-11-17 1997-06-06 Yagi Antenna Co Ltd Nrd guide circular polarized wave antenna

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09148842A (en) * 1995-11-17 1997-06-06 Yagi Antenna Co Ltd Nrd guide circular polarized wave antenna

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DI NALLO CARLO: "Properties of NRD-guide and H-huide higher-order modes: physical and nonphysical ranges", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 42, December 1994 (1994-12-01), pages 2429 - 2434 *
FUTOSHI KUROKI: "New type of millimeter wave antenna by using the high permittivity LSE NRD guide", IEEE MICROWAVE THEORY AND TECHNIQUES SYMPOSIUM, vol. 2, 20 May 2001 (2001-05-20), pages 1205 - 1208 *
LIAO LIAN-CHANG: "Dielectric resonator in nonradiative dielectric waveguide bandstop filter", MILLIMETER WAVE AND FAR-INFRARED TECHNOLOGY ICHWFT'89, 1989, pages 529 - 531, XP032356723, DOI: doi:10.1109/ICMWFT.1989.763897 *

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KR20020023741A (en) 2002-03-29
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