EP1568098B1 - Breitband-mikrowellenbandtrenneinrichtung - Google Patents

Breitband-mikrowellenbandtrenneinrichtung Download PDF

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Publication number
EP1568098B1
EP1568098B1 EP03795990A EP03795990A EP1568098B1 EP 1568098 B1 EP1568098 B1 EP 1568098B1 EP 03795990 A EP03795990 A EP 03795990A EP 03795990 A EP03795990 A EP 03795990A EP 1568098 B1 EP1568098 B1 EP 1568098B1
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EP
European Patent Office
Prior art keywords
filters
band
pass
low
pass filter
Prior art date
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Expired - Lifetime
Application number
EP03795990A
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English (en)
French (fr)
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EP1568098A1 (de
Inventor
Jean-Claude Thales Intellectual Property Mage
Bruno Thales Intellectual Property Marcilhac
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Thales SA
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Thales SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies

Definitions

  • the present invention relates to a broadband microwave band separator device.
  • Bandpass filters currently used in microwave frequencies are generally of the type with straight lines or folded in "U". Such filters have insufficient stiffness of the flanks of their frequency / attenuation characteristic and insertion losses.
  • No. 5,838,675 discloses a microwave channel separator having a "manifold" type structure and including limiting amplifiers, which makes it difficult to implement.
  • the present invention relates to a separator device for broadband microwave receiver of the aforementioned type, this separator device does not have the aforementioned drawbacks of the devices of the prior art.
  • the separator device comprises a set of pairs of band-pass and low-pass filters, and in each pair of filters relating to a frequency band Fb n -Fh n to be separated from a set of bands, the band-pass filter has a bandwidth between Fb n and Fh n (with Fb n ⁇ Fh n ), while the low-pass filter has a cutoff frequency located at Fh n-1 , all the filters being of superconducting material cooled in operation at a temperature below the critical temperature of this material, each pair of filters being made on the same individual bar and having a common input to which these filters are connected directly.
  • the separator device 1 shown diagrammatically in FIG. 1 comprises several pairs of filters, each pair of filters consisting of a bandpass filter and a low-pass filter.
  • the separator device comprises five pairs of filters, respectively referenced 2.1 to 2.5, but it is understood that the number of filter pairs of the separator device of the invention may be different, depending on the number of channels contained in the signal received by the microwave receiver to which this separator device belongs.
  • the first pair of filters 2.1 connected just after the input 3 is that relating to the highest frequency channel (channel 1 in the example), the second pair, 2.2; connected just downstream of the first pair, refers to the channel (channel 2) at frequencies just below those of channel 1, and so on up to the pair of filters 2.5 (channel 5).
  • the channels 1 to 5 respectively have the following frequency bands (in GHz): 16-18, 12-16, 8-12, 4-8 and 2-4, but it is understood that these values may be different in other applications.
  • Each pair of filters 2.1 to 2.5 (2.1 to 2.n in the most general case) is made on the same single support substrate strip, as described below with reference to FIG. separator 1 are fixed in a box with separate cells 4, parallel to each other, and decoupled from each other by electromagnetic shields 5.1 to 5.4 formed on the walls of the boxes of the housing 4.
  • the inlet 3 is connected to the point 5 which is the common input of filters 2.1.
  • the output 6 of the pair of filters 2.1 to the next pair 2.2 is the output of the low-pass filter of the pair 2.1 (opposite its input 5).
  • This output 6 is connected to the input 7 of the pair 2.2 which is the common input of the filters of the pair 2.2 and so on up to the pair 2.5 (outputs 8, 10, 12 respectively connected to the inputs 9, 11 , 13).
  • the output 14 of the low-pass filter of the pair 2.5 is connected either to a suitable dummy load (in order to absorb residuals from the incident signal) or, for example, to a spectrum analyzer.
  • the signals from channels 1 to 5 are collected, and only these signals (without harmonics or end parts of the contiguous channels).
  • FIG. 2 shows one of the strips of the separator 1, for example the bar 2.1. Its bandpass filter is made as follows.
  • the bandpass filter described here has a bandwidth of 2 or 4 GHz, for a center frequency of between 3 and 20 GHz, but it is understood that the invention is not limited to these values, and that a person skilled in the art will be able, on reading the present description, to modify these values while obtaining the same advantages as with the present example.
  • the band-pass filter 20 shown in FIGS. 2 to 4 of the drawing comprises, for the present example, twelve lines of electrical length ⁇ / 2 coupled together and referenced L1 to L12, but it is understood that the number of lines d a filter may be different, advantageously between 12 and 16.
  • the stiffness of the flanks of the frequency / attenuation characteristic being a direct function of the number of lines, it may be necessary to seek a compromise between a high stiffness and a large bulk ( generally, devices comprising such filters should have a large number to improve their characteristics, while their size must be limited, for example when these devices are airborne).
  • L1 and L12 lines are "folded” lines with a general "V" shape.
  • the two branches of this "V" instead of being rectilinear, are each in the form of a “step” having, at mid-height, a bearing perpendicular to the axis of symmetry of the "V” at each end of which is connected an "amount” parallel to the axis of symmetry of the "V".
  • the successive lines are arranged head-to-tail, so as to be optimally coupled and to reduce the size of the filter.
  • the free end of the line L12 is directly connected to a metallized block E formed on a support bar 21 and constituting the input terminal of the filter 20.
  • the free end of the line L1 is directly connected to a metallized block S formed on the substrate 21 and constituting the output terminal of the filter 20.
  • a metallized block S formed on the substrate 21 and constituting the output terminal of the filter 20.
  • the shapes and dimensions of the terminals E and S are determined so as to give them an adequate impedance. It is also understood that, if only the bandpass filter 20 is used, the input of the filter may be on the side of the line L1, and its output on the side of the line L12.
  • the bar 21 has for example a rectangular shape, and the lines L1 to Ln follow one another in a direction 22 parallel to a long side of the bar 21. These lines have a general shape of "V" and the axes of symmetry of these " V "are all parallel to a direction 23 which is perpendicular to the direction 22, the openings of the" V "being alternately directed in the direction otherwise.
  • the common "height" of all the lines L1 to Ln is referenced h (dimension of the lines measured parallel to the direction 23).
  • all the lines are produced in the following manner, as explained below for the line Lm, identical to all other lines, only the orientation of lines alternating from one line to the next.
  • the axis of symmetry of the line Lm is referenced 24, and only half of this line is described here (to the left of the axis 24, as seen in FIG. 4), while the other half is deducing the symmetry with respect to the axis 24.
  • the line Lm comprises a first rectilinear section 25 extending over substantially half the height h. This section is parallel to the axis 24 and is distant about h / 2.
  • the section 25 is followed by a section 26 which is perpendicular to it and moves towards the axis 24 without however reaching it.
  • the section 26 is extended by a section 27 parallel to the axis 24, which extends itself by a section 28 perpendicular to the axis 24 and reaching the axis 24.
  • the other half of the line Lm consists of sections 25a to 28a, respectively symmetrical sections 25 to 28 with respect to the axis 24.
  • D be the distance between the sections 25 and 25a.
  • the sum of the lengths of the sections 28 and 28a is substantially equal to D / 3, and as a result, the lengths of the sections 26 and 26a are substantially equal to each other at D / 3.
  • the successive lines L1 to Ln are very close to each other, in order to ensure optimal coupling between them.
  • the distance d between two adjacent lines is advantageously a few tens of micrometers and preferably less than 100 ⁇ m for filter lines that can operate at frequencies between 2 and 20 GHz, for example.
  • the low-pass filter 29 of the strip 2.1 is made in a manner known per se with regard to its topology, the important difference compared to known low-pass filters operating at similar frequencies residing in the fact that the conductive elements of FIG.
  • Low-pass filters of the invention are not conventional metal layers (Cu, Au, ...) but are composed of thin superconducting layers deposited on the same substrate strip 21 as that carrying the band-pass filter described above. -above. For this reason, the low-pass filter 29 will be described here only briefly.
  • This filter 29 comprises several LC cells, for example nine cells 30.1 to 30.9.
  • Each of these cells 30.1 to 30.9 consists of a narrow line, possibly folded in meanders and acting as inductance (referenced 31.3 for the cell 30.3 only, to simplify the drawing) and a rectangular plate (referenced 32.3 for the cell 30.3) acting as a capacitor with the metallization of the other side of the substrate 21 (not visible in the drawing).
  • the electrodes of the capacitors of the cells 30.1 to 30.8 are of the same dimensions, whereas that of the cell 30.9 is of smaller dimensions.
  • the inductances of the cells 30.2 to 30.8 are identical, while those of the cells 30.1 and 30.9 are smaller.
  • the capacitor of the last cell 30.9 is connected to a small block S1 constituting the output terminal to the next pair (or to the termination for the pair 2.5).
  • the relative dimensions of the inductances and capacitors of the different cells of the low-pass filter are determined as a function of the relative impedances of the filter and of the elements connected to its input and its output, the impedance matching being able to be taken into account. charge by the first and last cells, or be progressive and affect neighboring cells.
  • the shapes and dimensions of the conductors connecting the filter cells to the terminals 15 and 16 are such that these conductors provide part of the impedance matching. In the example shown in FIG.
  • the inductor 30.1 is not connected directly to the input terminal E, but to the line L12 of the band-pass filter, almost in the middle, but it is understood that this connection could be performed differently (inductor 30.1 connected directly to the terminal E or to another place of the line L12).
  • inductor 30.1 connected directly to the terminal E or to another place of the line L12.

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)
  • Aerials With Secondary Devices (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Inorganic Insulating Materials (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Claims (2)

  1. Trennvorrichtung für Breitband-Mikrowellenempfänger, dadurch gekennzeichnet, dass sie eine Einheit von Paaren aus Bandpassfiltern und Tiefpassfiltern (2.1 bis 2.5) aufweist, und dass in jedem Filterpaar, das sich auf ein von einer Einheit von Bändern zu trennendes Frequenzband Fbn - Fhn bezieht, das Bandpassfilter ein Durchlassband zwischen Fbn und Fhn (mit Fbn < Fhn) hat, während das Tiefpassfilter eine Grenzfrequenz hat, die auf Fhn-1 liegt, wobei alle Filter aus supraleitendem Material sind, das im Betrieb auf eine Temperatur unter der kritischen Temperatur dieses Materials gekühlt wird, wobei jedes Filterpaar auf der gleichen individuellen Leiste (21) hergestellt ist und einen gemeinsamen Eingang (E) hat, mit dem das Tiefpassfilter und das Bandpassfilter dieser Leiste direkt verbunden sind, und dadurch, dass der getrennte Bandausgang (S) derjenige des Bandpassfilters ist, und dass der Ausgang (S1) zum folgenden Paar (6, 8, 10, 12) oder zu einem Abschluss (14) derjenige des Tiefpassfilters ist.
  2. Trennvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Filterpaare ausgehend vom Eingang des Separators in abnehmender Reihenfolge der zu trennenden Frequenzbänder (Kanal 5 zu Kanals 1) angeordnet sind.
EP03795990A 2002-11-08 2003-11-03 Breitband-mikrowellenbandtrenneinrichtung Expired - Lifetime EP1568098B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0214049A FR2847079B1 (fr) 2002-11-08 2002-11-08 Dispositif separateur de bandes hyperfrequences a large bande
FR0214049 2002-11-08
PCT/EP2003/050780 WO2004042863A1 (fr) 2002-11-08 2003-11-03 Dispositif separateur de bandes hyperfrequences a large bande

Publications (2)

Publication Number Publication Date
EP1568098A1 EP1568098A1 (de) 2005-08-31
EP1568098B1 true EP1568098B1 (de) 2007-01-24

Family

ID=32116501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03795990A Expired - Lifetime EP1568098B1 (de) 2002-11-08 2003-11-03 Breitband-mikrowellenbandtrenneinrichtung

Country Status (7)

Country Link
EP (1) EP1568098B1 (de)
AT (1) ATE352879T1 (de)
AU (1) AU2003298265A1 (de)
DE (1) DE60311520T2 (de)
ES (1) ES2280834T3 (de)
FR (1) FR2847079B1 (de)
WO (1) WO2004042863A1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5838675A (en) * 1996-07-03 1998-11-17 The United States Of America As Represented By The Secretary Of The Navy Channelized receiver-front-end protection circuit which demultiplexes broadband signals into a plurality of different microwave signals in respective contiguous frequency channels, phase adjusts and multiplexes channels
US6108569A (en) * 1998-05-15 2000-08-22 E. I. Du Pont De Nemours And Company High temperature superconductor mini-filters and mini-multiplexers with self-resonant spiral resonators

Also Published As

Publication number Publication date
ATE352879T1 (de) 2007-02-15
DE60311520D1 (de) 2007-03-15
FR2847079A1 (fr) 2004-05-14
DE60311520T2 (de) 2007-11-22
EP1568098A1 (de) 2005-08-31
FR2847079B1 (fr) 2005-06-17
WO2004042863A1 (fr) 2004-05-21
ES2280834T3 (es) 2007-09-16
AU2003298265A1 (en) 2004-06-07

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