EP0903806A2 - Quasioptisches Filter und Antennenanordnung mit einem solchen Filter - Google Patents
Quasioptisches Filter und Antennenanordnung mit einem solchen Filter Download PDFInfo
- 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- Withdrawn
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Images
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)
Abstract
Description
- Fig. 1
- ein planes Filter,
- Fig. 2
- eine besonders einfache Ausführungsform eines planen Filters,
- Fig. 3
- ein halbkugelförmiges Filter,
- Fig. 4
- ein planes Filter in Verbindung mit einer dielektrischen Linse.
Claims (11)
- Quasioptisches Filter zur Aufteilung von sich unter Freiraumbedingungen mit unterschiedlicher Frequenzen ausbreitender HF-Energie, bestehend aus einer Filterplatte aus einer Anzahl von Schichten aus Stoffen, deren Dielektrizitätszahlen und deren Dicken so gewählt sind, daß das Filter für HF-Energie einer ersten Frequenz einen möglichst hohen Transmissionsfaktor und für HF-Energie mindestens einer zweiten Frequenz einen hohen Reflexionsfaktor hat, dadurch gekennzeichnet, daß die Dielektrizitätszahlen und die Dicken (d1, d2) der Schichten (1, 2) so bemessen sind, daß die zweite Frequenz ein Vielfaches der ersten Frequenz ist.
- Filter nach Anspruch 1, dadurch gekennzeichnet, daß seine Abmessungen (D) rechtwinklig zu seiner Dicke größer als vier Wellenlängen der HF-Energie der ersten Frequenz sind.
- Filter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Oberflächen der Schichten (22, 23) Ausschnitte der Oberflächen von Kugeln mit einem gemeinsamen Mittelpunkt sind.
- Filter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Oberflächen der Schichten Ausschnitte der Oberflächen von Ellipsoiden mit gemeinsamen Brennpunkten sind.
- Filter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß mindestens einer der Stoffe (32) der Schichten ein Gas ist.
- Filter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mindestens einer der Stoffe der Schichten ein Kunststoffschaum ist.
- Filter nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß es als Abdeckung der strahlenden Öffnung eines Hohlleiters ausgebildet ist.
- Filter nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß es einen integralen Bestandteil (4) einer dielektrischen Linse (5) bildet.
- Filter nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß seine Flächennormale mit der Hauptstrahlrichtung der HF-Energie einen Winkel einschließt.
- Antennenanordnung mit einem Filter nach Anspruch 9, gekennzeichnet durch einen in Fortpflanzungsrichtung der reflektierten HF-Energie der zweiten Frequenz außerhalb der Hauptstrahlrichtung angeordneten Absorber für die reflektierte HF-Energie.
- Verwendung eines Filters nach einem der Ansprüche 1 bis 10 zur Unterdrückung mindestens der ersten Oberwelle eines HF-Signals.
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 (de) | 1999-03-24 |
| EP0903806A3 EP0903806A3 (de) | 1999-03-31 |
Family
ID=7837215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98113850A Withdrawn EP0903806A3 (de) | 1997-07-29 | 1998-07-24 | Quasioptisches Filter und Antennenanordnung mit einem solchen Filter |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0903806A3 (de) |
| DE (1) | DE19732569A1 (de) |
Family Cites Families (10)
| 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 (en) * | 1989-12-19 | 1999-09-21 | Adrian W. Alden | Low noise dual polarization electromagnetic power reception and conversion system |
| 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 |
-
1997
- 1997-07-29 DE DE1997132569 patent/DE19732569A1/de not_active Withdrawn
-
1998
- 1998-07-24 EP EP98113850A patent/EP0903806A3/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0903806A3 (de) | 1999-03-31 |
| DE19732569A1 (de) | 1999-02-18 |
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