EP0903806A2 - Quasi optique filtre et antenne arrangement avec un tel filtre - Google Patents

Quasi optique filtre et antenne arrangement avec un tel filtre Download PDF

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Publication number
EP0903806A2
EP0903806A2 EP98113850A EP98113850A EP0903806A2 EP 0903806 A2 EP0903806 A2 EP 0903806A2 EP 98113850 A EP98113850 A EP 98113850A EP 98113850 A EP98113850 A EP 98113850A EP 0903806 A2 EP0903806 A2 EP 0903806A2
Authority
EP
European Patent Office
Prior art keywords
filter
energy
frequency
filter according
layers
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Withdrawn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
EP98113850A
Other languages
German (de)
English (en)
Other versions
EP0903806A3 (fr
Inventor
Gerhard Friedsam
Ralph Rasshofer
Erwin Dr. Biebl
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.)
Spinner GmbH
Original Assignee
Spinner GmbH
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 Spinner GmbH filed Critical Spinner GmbH
Publication of EP0903806A2 publication Critical patent/EP0903806A2/fr
Publication of EP0903806A3 publication Critical patent/EP0903806A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/001—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems for modifying the directional characteristic of an aerial
    • 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
    • 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
    • H01Q15/23—Combinations of reflecting surfaces with refracting or diffracting devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
    • H01Q19/08—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens for modifying the radiation pattern of a radiating horn in which it is located

Definitions

  • the invention relates to a quasi-optical filter for division of themselves under open space conditions with different Frequencies spreading RF energy, consisting of a filter plate with a number of layers of fabrics, their dielectric numbers and their thicknesses selected in this way are that the filter for RF energy of a first frequency the highest possible transmission factor and for RF energy at least one second frequency has a high reflection factor Has.
  • DE 36 01 553 C2 describes an arrangement for division of RF energy known to be essentially the same as the above has the specified structure.
  • This arrangement serves as at least Parabolic antenna for RF energy to be reflected a "second" frequency over one of the usual feed arrangements is shed.
  • the RF energy of a "first" Frequency which is an odd fraction of the second Frequency is from a separate antenna system that either behind the parabolic antenna or in this is integrated, emitted.
  • the The first frequency is that which forms the parabolic antenna Arrangement permeable, so that the main beam direction of the RF energy the first frequency with that of the second Frequency coincides.
  • the invention is based on another problem, however is that oscillators regularly in addition to the RF energy the desired frequency also RF energy at harmonic frequencies produce. Especially with microwave and Millimeter oscillators above about 10 GHz is the one at the first and often still the second harmonic RF energy is slightly less than the RF energy of the Fundamental wave. To suppress the RF energy on the unwanted Harmonic frequencies are therefore regular Harmonic filter with a high blocking attenuation of typical more than 30 dB necessary.
  • the invention has for its object a related Filter that can be used with the radiation of RF energy to suppress harmonics, at least the first Harmonic to create that regardless of the presence a waveguide connection between the RF energy source and the antenna is.
  • the invention is based on that known, quasi-optical filter according to the preamble of claim 1 and proposes the dielectric constant and to measure the thickness of the layers so that the second frequency is a multiple of the first frequency.
  • the dimensions of the filter perpendicular to its thickness should be greater than four wavelengths of RF energy be the first frequency (claim 2). The larger these dimensions the smaller the divergence of the RF energy beam. When attaching the filter at the waist one Gaussian beam, however, the four wavelengths mentioned are sufficient the RF energy of the first frequency.
  • the filter consists of flat layers.
  • the surfaces can be used to adapt to curved wavefronts of the layers but also cutouts of the surfaces of spheres with a common center (claim 3) or of ellipsoids with common focal points (claim 4) be.
  • the filter can be an integral part of the lens form (claim 8).
  • the filter can be on a the large areas of the dielectric lens arranged and with this be connected in one piece.
  • the harmonics are reflected on the filter.
  • a flat filter whose surface normal with the main beam direction of the RF energy coincides, that is Harmonics reflected back into the signal source. This is often undesirable and can be avoided if the surface normal of the filter with the main beam direction of the RF energy encloses an angle (claim 9). That angle can e.g. be between 10 ° and 60 °.
  • an absorber for the reflected RF energy is attached be (claim 10).
  • the proposed quasi-optical filter is preferred Suppression of at least the first harmonic of an RF signal used (claim 11).
  • Figure 1 shows a harmonic filter of seven layers, from which four layers 1 have a first thickness d1, between which are three layers 2 with the thickness d2.
  • the dielectric numbers and the thicknesses d1, d2 of the layers 1, 2 are dimensioned so that the filter for one of its large areas e.g. RF radiation striking in the direction of arrow P. a given usable frequency as high as possible Has a transmission factor, but at least that in the HF radiation first harmonic also contained accordingly reflected twice the useful frequency as completely as possible.
  • the layers 1, 2 forming Materials very different dielectric numbers and possibly also very different relative Have permitivities.
  • the filter is only two different embodiments Layered fabrics.
  • the filter can be used as a flat circular disc be trained. In this case the diameter is D at least four times the wavelength of the fundamental wave according to the useful frequency.
  • the useful frequency is preferably in the gigahertz range.
  • While the filter of Figure 1 is mainly used as a harmonic filter for HF radiation with at least approximately 2 shows an embodiment for HF radiation with curved, e.g. spherically curved Wave fronts.
  • the harmonic filter is analog that constructed according to FIG. 1. It also consists of only two different substances, namely two layers 21 and three layers 22. Layers 21, 22 Cutouts from the surfaces of spheres with a common Center.
  • Figure 3 shows a flat filter with four equal layers 31, which are separated from one another by spacers 33.
  • the thickness of the spacers 33 defines the thickness d2 of the layers 32, which here consist of air, but also of can be a plastic foam, the dielectric constant is very close to one.
  • FIG. 4 shows a flat filter plate 4 with a similar one Structure as shown in Fig. 1, but on the large area a dielectric lens 5 arranged and with this in appropriately connected.
  • the dielectric lens 5 serves as usual the beam shaping of those passing through the filter 4 HF radiation with the useful frequency.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
EP98113850A 1997-07-29 1998-07-24 Quasi optique filtre et antenne arrangement avec un tel filtre Withdrawn EP0903806A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19732569 1997-07-29
DE1997132569 DE19732569A1 (de) 1997-07-29 1997-07-29 Quasioptisches Oberwellenfilter

Publications (2)

Publication Number Publication Date
EP0903806A2 true EP0903806A2 (fr) 1999-03-24
EP0903806A3 EP0903806A3 (fr) 1999-03-31

Family

ID=7837215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98113850A Withdrawn EP0903806A3 (fr) 1997-07-29 1998-07-24 Quasi optique filtre et antenne arrangement avec un tel filtre

Country Status (2)

Country Link
EP (1) EP0903806A3 (fr)
DE (1) DE19732569A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698001A (en) * 1969-11-11 1972-10-10 Nippon Telegraph & Telephone Frequency group separation filter device using laminated dielectric slab-shaped elements
US3842421A (en) * 1973-02-15 1974-10-15 Philco Ford Corp Multiple band frequency selective reflectors
US4343002A (en) * 1980-09-08 1982-08-03 Ford Aerospace & Communications Corporation Paraboloidal reflector spatial filter
US4864321A (en) * 1984-08-20 1989-09-05 Radant Technologies, Inc. Electromagnetic energy shield
DE3601553C2 (de) * 1986-01-21 1995-08-24 Daimler Benz Aerospace Ag Anordnung zur Aufteilung von Höchstfrequenzenergie
CA2006481C (fr) * 1989-12-19 1999-09-21 Adrian W. Alden Systeme a faible bruit pour la reception et la conversion de signaux electromagnetiques a double polarisation
US5187461A (en) * 1991-02-15 1993-02-16 Karl Brommer Low-loss dielectric resonator having a lattice structure with a resonant defect
DE4121584A1 (de) * 1991-06-29 1993-01-21 Messerschmitt Boelkow Blohm Verfahren und einrichtung zur radartarnung bei triebwerken
US5455594A (en) * 1992-07-16 1995-10-03 Conductus, Inc. Internal thermal isolation layer for array antenna
DE19607934C1 (de) * 1996-03-01 1997-07-10 Daimler Benz Aerospace Ag Reflektor

Also Published As

Publication number Publication date
EP0903806A3 (fr) 1999-03-31
DE19732569A1 (de) 1999-02-18

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