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WO2007037577A1 - Appareil de determination du diametre d'une antenne parabolique et son procede - Google Patents

Appareil de determination du diametre d'une antenne parabolique et son procede Download PDF

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Publication number
WO2007037577A1
WO2007037577A1 PCT/KR2005/004550 KR2005004550W WO2007037577A1 WO 2007037577 A1 WO2007037577 A1 WO 2007037577A1 KR 2005004550 W KR2005004550 W KR 2005004550W WO 2007037577 A1 WO2007037577 A1 WO 2007037577A1
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WO
WIPO (PCT)
Prior art keywords
antenna
eoc
diameter
graph
axis
Prior art date
Application number
PCT/KR2005/004550
Other languages
English (en)
Inventor
Jeom-Hun Lee
Jae-Hoon Kim
Ho-Jin Lee
Original Assignee
Electronics And Telecommunications Research Institute
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
Priority claimed from KR1020050109244A external-priority patent/KR100653190B1/ko
Application filed by Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Priority to US12/088,461 priority Critical patent/US7653501B2/en
Publication of WO2007037577A1 publication Critical patent/WO2007037577A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal

Definitions

  • the present invention relates to an apparatus for determining a diameter of a reflector antenna and a method therefor; and, more particularly, to an apparatus and method which are capable of easily and rapidly determining an optimal antenna diameter by expressing Edge Of Coverage (EOC) directivity required for multiple frequencies on one rectangular coordinate in designing the reflector antenna.
  • EOC Edge Of Coverage
  • a diameter thereof is determined so that it has an optimal EOC gain.
  • a parabolic antenna accommodating two or more frequencies adjusts a diameter of aperture in order to meet EOC directivity at the two frequencies.
  • Fig. 1 is a flowchart for describing a conventional method for determining a diameter of a reflector antenna mounted on communication satellite, wherein a procedure for determining a diameter of a parabolic antenna accommodating two frequencies is illustrated.
  • electrical characteristic values such as a frequency, an EOC gain, a sidelobe level, and an X- polarization level are set up at step 101.
  • a first frequency, an antenna diameter variable value and an antenna geometry variable value are inputted as parameters for the first frequency at step 102, and pattern calculation (simulation) is performed at step 103.
  • pattern calculation is performed at step 103.
  • an EOC gain acquired by the pattern calculation is analyzed at step 104.
  • the process of the prior art goes to step 106 to carry out a procedure for a second frequency. If the EOC gain is out of the set value range at step 105, the process increases/decreases the antenna diameter variable value depending on a prescribed rule at step 106, and then returns to step 103 to repeatedly perform the processes as described above.
  • an antenna diameter for the first frequency is determined, a second frequency, an antenna diameter variable value and an antenna geometry variable value are inputted as parameters for the second frequency at steps 107 and 108, and pattern calculation (simulation) is performed at step 103. And then, an EOC gain acquired by the pattern calculation is analyzed at step 104. In the analysis, if the EOC gain is within the set value range at step 105, the process goes to step 109 wherein an antenna diameter meeting the two frequencies is determined., However, if the EOC gain is out of the set value range at step 105, the process increases/decreases the antenna diameter variable value depending on the prescribed rule at step 106, and then returns to step 103 to repeatedly perform the processes as set forth above.
  • two antenna diameters are determined for the two frequencies, i.e., the first and second frequencies. Then, in order to accommodate the two frequencies in one antenna, the process further performs steps 109 and 110 to determine an optimal one of the two diameters that meets EOC directivity 'at the two frequencies. That is, the antenna diameter variable values determined for the first and the second frequencies are compared with each other at step 109. If the two values are not the same, the process increases/decreases the antenna diameter variable values depending on the prescribed rule, and then returns to step 103 to repeatedly perform the above-mentioned processes. If the two values are the same, the process determines the antenna diameter variable values determined for the first and the second frequencies as the optimal antenna diameter at step 110.
  • an object of the present invention to provide an apparatus and method which are capable of easily and rapidly determining an optimal antenna diameter by expressing EOC directivity required for multiple frequencies in one rectangular coordinate in designing a reflector antenna.
  • an apparatus for determining a diameter of a reflector antenna including: a setting unit for setting up electrical characteristic values of the reflector antenna upon receipt thereof from outside; a parameter input unit for receiving a frequency, an antenna diameter variable value, antenna efficiency, ET, and an EOC angle as parameters for each of multiple frequencies to be accommodated in the reflector antenna; a graph generator for generating, on one rectangular coordinate, a graph representing the relationship between an antenna diameter and EOC directivity with respect to the EOC angle based on the parameters for each frequency received through the parameter input unit; an antenna diameter determination unit for determining an antenna diameter that simultaneously meets the preset EOC directivities for the frequencies to be accommodated in the reflector antenna by using the graph generated by the graph generation unit; and a graph output unit for mapping and outputting the graph generated by the graph generation unit on one rectangular coordinate with an antenna diameter axis and an EOC directivity axis, to thereby represent the antenna diameter determined by the antenna diameter determination unit on the graph.
  • a method for determining a diameter of a reflector antenna including the steps of: setting up electrical characteristic values of the reflector antenna upon receipt thereof from outside; receiving a frequency, an antenna diameter variable value, antenna efficiency, ET, and an EOC angle as parameters for each of multiple frequencies to be accommodated in the reflector antenna; generating, on one rectangular coordinate, a graph representing the relationship between an antenna diameter and EOC directivity with respect to the EOC angle based on the parameters received for each frequency; determining an antenna diameter that simultaneously meets the preset EOC directivity for the frequencies to be accommodated in the reflector antenna by using the generated graph; and mapping and outputting the generated graph on a rectangular coordinate with an antenna diameter axis and an EOC directivity axis, to thereby represent the determined antenna diameter on the graph .
  • the present invention can easily and rapidly determine an optimal antenna diameter by expressing EOC directivity required for multiple frequencies in one rectangular coordinate in designing a parabolic reflector antenna used in satellite communications and so on.
  • Fig. 1 is a flowchart for describing a conventional method for determining a diameter of a reflector antenna mounted on communication satellite
  • Fig. 2 illustrates a flowchart for describing a method for determining a diameter of a reflector antenna mounted on communication satellite in accordance with a preferred embodiment of the present invention
  • Fig. 3 offers a graph representing the relationship between an antenna diameter and EOC directivity with respect to an EOC angle;
  • Fig. 4 describes a design structure of a reflector antenna
  • Fig. 5 illustrates a configuration of an apparatus for determining a diameter of a reflector antenna mounted on communication satellite in accordance with a preferred embodiment of the invention.
  • Fig. 2 shows a flowchart for describing a method for determining a diameter of a reflector antenna mounted on communication satellite in accordance with a preferred embodiment of the present invention, wherein a procedure for determining a diameter of a parabolic antenna accommodating an n-number of frequencies is illustrated.
  • the process of the invention sets up electrical characteristic values such as a frequency, an EOC gain, a sidelobe level, and an X-polarization level at step 201.
  • the process inputs a frequency, an antenna diameter variable value, antenna efficiency, Edge Taper (ET) , and an EOC angle as parameters in parallel for each frequency at steps 202 to 204.
  • a frequency an antenna diameter variable value, antenna efficiency, Edge Taper (ET) , and an EOC angle as parameters in parallel for each frequency at steps 202 to 204.
  • ET Edge Taper
  • the process generates a graph representing the relationship between an antenna diameter and EOC directivity with respect to an EOC angle based on the inputted parameters for each frequency at step 205.
  • Fig. 3 offers an example of applying a set of parameters of 20 GHz and 30 GHz, wherein the graph exhibits EOC directivities in terms of antenna diameters at an EOC angle 0.7°.
  • an optimal antenna diameter can be determined by finding an antenna diameter (X-axis value) having the required directivity (Y-axis value) .
  • the following is a detailed description of the graph showing the relationship between an antenna diameter and EOC directivity at an EOC angle with reference to Fig. 3.
  • G 0 When directivity and frequency in terms of a circular reflector antenna diameter D with respect to a beam axis (On-axis) are G 0 and f m respectively, G 0 is expressed as follows:
  • the reflector antenna 3 dB beam width is approximately represented by: Eq . ( 2 )
  • Eq. (2) may be expressed as:
  • the shape of beam around the beam axis is defined by:
  • the X-axis on the graph indicates the antenna diameter and the Y-axis denotes the
  • an optimal antenna diameter (X-axis value) that satisfies the required EOC directivity (Y-axis value) is determined by using the generated graph at step 206.
  • Fig. 4 depicts a design structure of a parabolic antenna.
  • Indicated by reference numeral 410 is a diameter of antenna aperture
  • indicated by reference numeral 430 is a feed horn pattern
  • indicated by reference numeral 450 is a position of antenna focal point.
  • Fig. 5 illustrates a configuration of an apparatus for determining a diameter of a reflector antenna mounted on communication satellite in accordance with a preferred embodiment of the invention.
  • the antenna diameter determination apparatus 500 shown in Fig. 5 includes a setting unit 51, a parameter input unit 52, a graph generator 53, a graph output unit 54 and an antenna diameter determination unit 55.
  • the setting unit 51 sets up electrical characteristic values of the reflector antenna such as a frequency, an EOC gain, a sidelobe level, and an X- polarization level upon receipt thereof from the outside.
  • the parameter input unit 52 is provided with plural modules that process in parallel for respective frequencies, wherein a frequency, an antenna diameter variable value, antenna efficiency, ET, and an EOC angle are inputted as parameters for each frequency.
  • the graph generator 53 generates, on one rectangular coordinate, a graph representing the relationship between an antenna diameter and EOC directivity with respect to an EOC angle based on the parameters for each frequency taken by the parameter input unit 52.
  • the generation principle of the graph is described in the above, and thus, details thereof will be omitted here for simplicity.
  • the antenna diameter determination unit 55 determines an antenna diameter that simultaneously satisfies the preset EOC directivity for multiple frequencies by using the graph created by the graph generator 53.
  • the graph output unit 54 maps and outputs the graph created by the graph generator 53 on the rectangular coordinate with an antenna diameter axis and an EOC directivity axis to thereby express the antenna diameter determined by the antenna diameter determination unit 55 on the graph.
  • the present invention easily and rapidly determines an optimal antenna diameter by expressing EOC directivity required for multiple frequencies on one rectangular coordinate in designing a reflector antenna mounted on communication satellite. Especially, the invention can readily and rapidly determine an optimal antenna diameter, without any repetitive calculation procedure, even when the difference of multiple frequencies to be accommodated in one reflector antenna is large.
  • the method of the present invention as mentioned above may be implemented by a software program that is stored in a computer-readable storage medium such as CD- ROM, RAM, ROM, floppy disk, hard disk, optical magnetic disk, etc. This process may be readily carried out by those skilled in the art; and therefore, details of thereof are omitted here.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un appareil et un procédé permettant de déterminer un diamètre d'une antenne à réflecteur. Cet appareil comprend une unité de réglage conçue pour régler des valeurs caractéristiques électriques de ladite antenne à réflecteur suite à une réception de l'extérieur, une unité d'entrée de paramètre élaborée pour recevoir une fréquence, une valeur variable de diamètre d'antenne, une efficacité d'antenne, une conicité de bord, et un bord d'angle de couverture (EOC) en tant que paramètres pour chacune des nombreuses fréquences à accepter dans ladite antenne, un générateur de graphe servant à engendrer, sur une coordonnée rectangulaire, un graphe représentant la relation entre un diamètre d'antenne et une directivité EOC par rapport à l'angle EOC, selon des paramètres pour chaque fréquence reçue par le biais de l'unité d'entrée de paramètre, une unité de détermination de diamètre d'antenne permettant de déterminer un diamètre d'antenne qui satisfait simultanément les directivités EOC pré-établies pour les fréquences à accepter dans ladite antenne au moyen du graphe produit par l'unité de génération de graphe, et une unité d'émission de graphe servant à mapper et produire le graphe engendré par ladite unité de génération de graphe sur une coordonnée rectangulaire avec un axe du diamètre d'antenne et un axe de directivité EOC, afin de représenter le diamètre d'antenne déterminé par l'unité de détermination d'antenne sur le graphe.
PCT/KR2005/004550 2005-09-29 2005-12-26 Appareil de determination du diametre d'une antenne parabolique et son procede WO2007037577A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/088,461 US7653501B2 (en) 2005-09-29 2005-12-26 Apparatus for determining diameter of parabolic antenna and method therefor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2005-0091561 2005-09-29
KR20050091561 2005-09-29
KR10-2005-0109244 2005-11-15
KR1020050109244A KR100653190B1 (ko) 2005-09-29 2005-11-15 반사판 안테나의 크기 결정 장치 및 그 방법

Publications (1)

Publication Number Publication Date
WO2007037577A1 true WO2007037577A1 (fr) 2007-04-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2005/004550 WO2007037577A1 (fr) 2005-09-29 2005-12-26 Appareil de determination du diametre d'une antenne parabolique et son procede

Country Status (1)

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WO (1) WO2007037577A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5160937A (en) * 1988-06-09 1992-11-03 British Aerospace Public Limited Company Method of producing a dual reflector antenna system
US5790077A (en) * 1996-10-17 1998-08-04 Space Systems/Loral, Inc. Antenna geometry for shaped dual reflector antenna

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5160937A (en) * 1988-06-09 1992-11-03 British Aerospace Public Limited Company Method of producing a dual reflector antenna system
US5790077A (en) * 1996-10-17 1998-08-04 Space Systems/Loral, Inc. Antenna geometry for shaped dual reflector antenna

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