EP0194583A2 - Passives Verfahren zur Veränderung der Phasen in der Fresnelzone - Google Patents

Passives Verfahren zur Veränderung der Phasen in der Fresnelzone Download PDF

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Publication number
EP0194583A2
EP0194583A2 EP86102937A EP86102937A EP0194583A2 EP 0194583 A2 EP0194583 A2 EP 0194583A2 EP 86102937 A EP86102937 A EP 86102937A EP 86102937 A EP86102937 A EP 86102937A EP 0194583 A2 EP0194583 A2 EP 0194583A2
Authority
EP
European Patent Office
Prior art keywords
phases
variation
fresnel
zones
zone
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP86102937A
Other languages
English (en)
French (fr)
Other versions
EP0194583A3 (de
Inventor
Maria Elena Gomez Moli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Radio Desarrollo Sa (radesa)
Original Assignee
Radio Desarrollo Sa (radesa)
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 Radio Desarrollo Sa (radesa) filed Critical Radio Desarrollo Sa (radesa)
Publication of EP0194583A2 publication Critical patent/EP0194583A2/de
Publication of EP0194583A3 publication Critical patent/EP0194583A3/de
Withdrawn legal-status Critical Current

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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
    • H01Q15/02—Refracting or diffracting devices, e.g. lens, prism

Definitions

  • This invention relates to a passive process for the variation of the phases of the Fresnel zones.
  • Fresnel zones In a plane intersecting the line ER connecting both the anten nas along the path of the waves. Assuming 0 is a point of the line ER and through it a plane P is traced intersecting the same, this will cut the Fresnel ellipsoids according to a series of ellipses arranged so that each will contain all the preceding; the surface of the first ellipse is called the first Fresnel zone, the crown included betweeen the first and the second ellipses is the second Fresnel zone, and so forth.
  • the ellipses When the plane P is perpendicular to the line ER, which is called axis of the beam, the ellipses will convert in concentric circumfe- renceshaving their centre in 0 and radiuses given by the Fresnet formula, whose zones will then be: the first zone a circle with radius r 1 , the second a circular crown with radiuses r l , and r 2 , etc. Some of these zones have been represented in Figure 1.
  • the process according to the present invention consits in the insertion of plates of dielectric materials having proper permittivity and suitable thickness to obtain the required phase variation in the points of each Fresnel zone, attaining one of the above-mentioned results.
  • the inserted plates should cover completely or in part each of the Fresnel zones, and their thicknesses should be apt to produce the proper phase variation.
  • the process can be applied repetidly in different points 0 1 ,, 0 2 in the path of the beam, as represented in figure 6, obtaining thereby a very important amplifying effect.
  • the process of the present invention consists in the insertion of dielectric bodies having the true or approximate corresponding shapes of the respective Fresnel zones formed in the selected point of the path of the beam, or of parts of the same, and the proper thicknesses in order that at the outlet faces the phases of the waves have udergone the required variations in each of the Fresnel zones, or in part of the same, as has been expla ined in this description and illustrated in figures 1 to 6.
  • the passive process for the variation of the phases of the Fresnel zone in one of its embodiments produces as a direct consequence a substantial increase of the field value in the receiving point, that means a corresponding increase of the density of the electromagnetic intensity received in said point.
  • This increase in the direction ER demonstrates that in different directions the energy will be reduced and as a consequence less detrimental interferences from a radio channel upon other contiguous or upon itself (attenuation of the signal due to reflection, effects produced by beams according to multiple paths, etc.) are produced.
  • the maximum energy gain is obtained in the receiver.
  • a substantial increa se in the gain is obtained inverting the phases of the waves passing through different even Fresne zones, so that their contrtbutions to the field formation change the sign, being negative, and so they cooperate now with the odd zones to increase the value of the received field.
  • the effects in the gain along ER become smaller.
  • dielectric bodies with different thicknesses are inserted in various Fresnel zones, which, properly selected, nullify or drastically reduce an interfering signal arriving in a known direction.
  • the same group of crowns resulting from the application of the described process can be used for various radioelectric channels E 1 R 1 , E 2 R 2 , etc. simultaneously when their axes cross in the centre of the group of crowns.
  • an embodiment of the described process in this particular case, is the production of a multiple antenna with a high gain, formed by a single group of dielectric crown and various coil antennas properly arranged in relation with the crowns, that can be used for the reception of the signals simultaneously from various television satellites.
  • the passive process for the variation of the phases of the Fresnel zones is further a process by means of which the phases of every Fresnel zone are separately changed, and by selecting properly said variations it is possible to obtain the required purpose. It substantially consists in the introduction of dielectric bodies, transparent to the electromagnetic waves, which cover each Fresnel zone and having thicknesses suitable to obtain in every point the required phase change. Even if the size of these bodies is non exactly matched with the covered zones, for instance using polygonal crowns, the effect attained with the present process will be almost the same as that with crowns having the same size as the corresponding Fresnel zones.

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  • Aerials With Secondary Devices (AREA)
EP86102937A 1985-03-06 1986-03-06 Passives Verfahren zur Veränderung der Phasen in der Fresnelzone Withdrawn EP0194583A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES541003A ES8700891A1 (es) 1985-03-06 1985-03-06 Procedimiento pasivo variador de las fases de las zonas de fresnel
ES541003 1985-03-06

Publications (2)

Publication Number Publication Date
EP0194583A2 true EP0194583A2 (de) 1986-09-17
EP0194583A3 EP0194583A3 (de) 1987-10-14

Family

ID=8488802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102937A Withdrawn EP0194583A3 (de) 1985-03-06 1986-03-06 Passives Verfahren zur Veränderung der Phasen in der Fresnelzone

Country Status (3)

Country Link
EP (1) EP0194583A3 (de)
ES (1) ES8700891A1 (de)
PT (1) PT82146A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2736470A1 (fr) * 1990-11-13 1997-01-10 Bony Gerard Procede pour la conception d'une antenne hyperfrequence protegee a surface rayonnante horizontale et antennes realisees selon ce procede

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189907A (en) * 1961-08-11 1965-06-15 Lylnan F Van Buskirk Zone plate radio transmission system
US3495265A (en) * 1965-08-11 1970-02-10 Bell Telephone Labor Inc Dielectric clutter fence
BR7606976A (pt) * 1976-10-15 1977-05-03 Camargo L De Dispositivo de acao ondulatoria para radio frequencias

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2736470A1 (fr) * 1990-11-13 1997-01-10 Bony Gerard Procede pour la conception d'une antenne hyperfrequence protegee a surface rayonnante horizontale et antennes realisees selon ce procede

Also Published As

Publication number Publication date
ES541003A0 (es) 1986-12-01
ES8700891A1 (es) 1986-12-01
EP0194583A3 (de) 1987-10-14
PT82146A (pt) 1986-09-16

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Inventor name: GOMEZ MOLI, MARIA ELENA