WO2014049400A1 - Antenne guide d'ondes polarisée de manière circulaire omnidirectionnelle - Google Patents

Antenne guide d'ondes polarisée de manière circulaire omnidirectionnelle Download PDF

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Publication number
WO2014049400A1
WO2014049400A1 PCT/IB2012/055638 IB2012055638W WO2014049400A1 WO 2014049400 A1 WO2014049400 A1 WO 2014049400A1 IB 2012055638 W IB2012055638 W IB 2012055638W WO 2014049400 A1 WO2014049400 A1 WO 2014049400A1
Authority
WO
WIPO (PCT)
Prior art keywords
waveguide
circularly polarized
antenna
top plate
bottom body
Prior art date
Application number
PCT/IB2012/055638
Other languages
English (en)
Inventor
Can Baris TOP
Doganay DOGAN
Original Assignee
Aselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi
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 Aselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi filed Critical Aselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi
Priority to EP12791858.9A priority Critical patent/EP2901525A1/fr
Priority to LU92461A priority patent/LU92461B1/xx
Publication of WO2014049400A1 publication Critical patent/WO2014049400A1/fr

Links

Classifications

    • 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
    • H01Q13/02—Waveguide horns
    • H01Q13/04—Biconical horns
    • 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
    • H01Q13/10—Resonant slot antennas
    • H01Q13/12—Longitudinally slotted cylinder antennas; Equivalent structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043—Slotted waveguides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043—Slotted waveguides
    • H01Q21/0062—Slotted waveguides the slots being disposed around the feeding waveguide
    • 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

Definitions

  • This invention is related to omnidirectional slotted waveguide antennas that can receive and transmit electromagnetic waves with circular polarization.
  • omnidirectional antennas that radiate or receive circularly polarized eletromagnetic waves: The use of parasitic elements around linearly polarized dipoles, use of polarizers around linearly polarized antennas, slot pairs that are cut around circular waveguides.
  • the dipoles are generally fed by coaxial lines which are lossy especially at high frequencies (>10 GHz).
  • the polarizers are also lossy materials which decrease the efficiency of the antenna.
  • the low-loss alternative is to use waveguide type antennas. Slot pairs that are cut around the circular waveguides can radiate circular polarizations. These slots must radiate with an equal amplitude but 90 degrees phase difference.
  • the omnidirectional characteristic can be obtained by creating a circular array of slot pairs around the circular waveguide.
  • the position, length, and angle of the slots in a pair are mechanical parameters which directly affects the performance of the antenna, and the machining tolerances become an issue especially at high frequencies (>10 GHz). In addition, careful electromagnetic optimization of these parameters is necessary.
  • an omnidirectional circularly polarized antenna which is used for battlefield identification, is enclosed.
  • the antenna has four inclined slots around a coaxial line with rectangular cross- section.
  • the slots are radiating into a parallel plate section.
  • the wavelengths of the vertical and the horizontal components of the electromagnetic wave is different in the parallel plate region.
  • the circular polarization is achieved by adjusting the length of the parallel plate region, to have a 90 degrees phase difference between the vertical and horizontal components at the aperture.
  • slots are cut on a coaxial line and the fed from that coaxial line. Thus, the efficiency of this antenna is relatively low.
  • the aim of this invention is to realize an omnidirectional circularly polarized waveguide antenna which exhibits low-loss, high efficiency, and provide a means of beam control in elevation plane.
  • Another aim of this invention is to realize an omnidirectional circularly polarized antenna which is relatively simple to design and manufacture.
  • Figure 1 The perspective view of the antenna.
  • Figure 2 The side view of the antenna.
  • Figure 5 The elevation pattern of the antenna.
  • Sekil 8 A realization of the antenna with flared parallel plates.
  • Sekil 9 The parameters used for calculation of the phase of the horizontally polarized component at the aperture.
  • the parts in the figures are numbered as follows:
  • the antenna which is the subject of this invention (1) basically comprises of:
  • At least one short circuited (41) circular waveguide (4) which goes through the bottom body (3) and top plate (2) ,
  • At least one standard rectangular waveguide (6) At least one transition waveguide (7) that matches the circular waveguide (4) and standard rectangular waveguide (6).
  • the antenna subject to this invention (2) is fed by a standard rectangular waveguide (6).
  • the standard waveguide (6) is excited, the electromagnetic wave directed to the circular waveguide(4) via the transition waveguide section (7).
  • the excited mode inside the circular waveguide (4) is TMoi.
  • the identical slots (5) - in terms of inclination angle and length- cut around the circular waveguide are excited with equal amplitude and phase.
  • Circular waveguide (4) is terminated with short circuit (41) inside the top plate (2).
  • the distance between the slot (5) centers and short circuit (41) is quarter guided- wavelength of the TM 01 mode inside the circular waveguide (4).
  • the slots (5) are positioned at the voltage maximum of the circular waveguide (4) TMoi mode.
  • the length of the slots (5) are in resonance at the center frequency of the operation band of the antenna (1) , to maximize the radiated power from the slots (nearly half free space wavelength at the center frequency).
  • the slots (5) cut on the circular waveguide (4) are inclined.
  • the inclination angle ( ⁇ ) should be chosen so that the desired polarization specifications are achieved. In one preffered embodiment, the inclination angle ( ⁇ ) is between 30° and 55°.
  • the polarization sense may be changed by changing the direction of the slots with the same inclination angle (Right Hand Circular Polarization (RHCP) to Left Hand Circular Polarization (LHCP) or vice versa ).
  • the horizontal polarized component of the electric field radiated by the slots (5) propagate with TEj mode in the parallel plate region formed by the top plate (2) and the bottom body.
  • the wavelength of the horizontal polarized component is given by :
  • the top plate (2) has a flared region (22). In that region the wavelength of the horizontally polarized component changes. This is caused by the gradual increase of the distance between the top plate (2) and the bottom body (3). If there is no flared region, the change in phase of the horizontally polarized component from slot to the aperture is given by:
  • dl the width of the parallel plate region formed by the top plate (2) and bottom body (3), at the constant parallel plate width region.
  • d(x) The width of the parallel plate region as function of length, at the flare section.
  • RHCP LHCP
  • the vertically polarized component should lead (lag) the horizontally polarized component by 90 degrees.
  • the amplitudes of both components must be equal at the aperture.
  • the radiation pattern of the antenna can be calculated using the antenna array factor, which is a function of antenna element (slot) number, and radius of the circular array Array factor is given by (in cylinderical coordinates ):
  • elevation angle, azimuth angle, the coordinate angle of n'th slot.
  • the radiation pattern of the antenna in one embodiment, for which the number of slots (5) is selected in conjunction with the radius of the circular waveguide (4) for minimum ripple in azimuth plane, and the length of the parallel plate region is chosen to radiate circular polarization is given in figures.
  • the flared section (22) is used to squint the beam in elevation plane ( Figure 5).
  • the flare can be used in one or both of the top plate (2) and bottom body (3) sections ( Figure 8).
  • the omnidirectional circularly polarized wavuide antenna (1) which is the subject of this invention, is entirely constructed with waveguides and does not contain any coaxial lines. Therefore, the loss is smaller and the efficiency is higher than the state of the art antennas which have the same radiation properties.
  • the circular polarization is not obtained by slot pairs. Therefore, the mechanical errors in manufacturing are much tolerable.
  • the a means of beam control in elevation plane is provided.

Landscapes

  • Waveguide Aerials (AREA)

Abstract

La présente invention porte sur des antennes guides d'ondes à fentes omnidirectionnelles qui sont utilisées pour recevoir et émettre des ondes électromagnétiques polarisées de manière circulaire. L'antenne comprend une plaque supérieure en forme de cylindre, un corps inférieur en forme de cylindre, un guide d'ondes circulaire court-circuité qui traverse la plaque supérieure et le corps inférieur, une pluralité de fentes inclinées qui sont coupées sur le guide d'ondes circulaire qui rayonnent dans la région de plaque parallèle formée par la plaque supérieure et le corps inférieur, une interface de guide d'ondes rectangulaire et un guide d'ondes de transition qui fournit une adaptation entre un guide d'ondes rectangulaire et un guide d'ondes circulaire.
PCT/IB2012/055638 2012-09-26 2012-10-17 Antenne guide d'ondes polarisée de manière circulaire omnidirectionnelle WO2014049400A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12791858.9A EP2901525A1 (fr) 2012-09-26 2012-10-17 Antenne guide d'ondes polarisée de manière circulaire omnidirectionnelle
LU92461A LU92461B1 (en) 2012-09-26 2012-10-17 Omnidirectional circularly polarized waveguide antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2012/10987 2012-09-26
TR201210987 2012-09-26

Publications (1)

Publication Number Publication Date
WO2014049400A1 true WO2014049400A1 (fr) 2014-04-03

Family

ID=47258046

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/055638 WO2014049400A1 (fr) 2012-09-26 2012-10-17 Antenne guide d'ondes polarisée de manière circulaire omnidirectionnelle

Country Status (3)

Country Link
EP (1) EP2901525A1 (fr)
LU (1) LU92461B1 (fr)
WO (1) WO2014049400A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108963416A (zh) * 2018-07-24 2018-12-07 成都菲斯洛克电子技术有限公司 毫米波安检仪中的圆形波导天线阵列结构
CN113972483A (zh) * 2021-11-26 2022-01-25 四川九洲电器集团有限责任公司 一种毫米波圆极化全向天线

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562332A (en) * 1945-05-03 1951-07-31 Henry J Riblet Tilted slot antenna
US4143377A (en) * 1976-11-30 1979-03-06 Thomson-Csf Omnidirectional antenna with a directivity diagram adjustable in elevation
EP0978899A1 (fr) * 1998-08-06 2000-02-09 Radiacion y Microondas, S.A. Antenne du type parabolique avec un diagramme de rayonnement isoflux
US20110215979A1 (en) 2010-03-05 2011-09-08 Lopez Alfred R Circularly polarized omnidirectional antennas and methods

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5134420A (en) * 1990-05-07 1992-07-28 Hughes Aircraft Company Bicone antenna with hemispherical beam

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562332A (en) * 1945-05-03 1951-07-31 Henry J Riblet Tilted slot antenna
US4143377A (en) * 1976-11-30 1979-03-06 Thomson-Csf Omnidirectional antenna with a directivity diagram adjustable in elevation
EP0978899A1 (fr) * 1998-08-06 2000-02-09 Radiacion y Microondas, S.A. Antenne du type parabolique avec un diagramme de rayonnement isoflux
US20110215979A1 (en) 2010-03-05 2011-09-08 Lopez Alfred R Circularly polarized omnidirectional antennas and methods

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2901525A1

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108963416A (zh) * 2018-07-24 2018-12-07 成都菲斯洛克电子技术有限公司 毫米波安检仪中的圆形波导天线阵列结构
CN113972483A (zh) * 2021-11-26 2022-01-25 四川九洲电器集团有限责任公司 一种毫米波圆极化全向天线

Also Published As

Publication number Publication date
LU92461B1 (en) 2014-09-26
EP2901525A1 (fr) 2015-08-05

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