EP0738022A1 - Bandpasshohlraumfilter mit Kammleitungsstruktur und Radiohöhenmesser mit einem derartigen Eingangsfilter - Google Patents

Bandpasshohlraumfilter mit Kammleitungsstruktur und Radiohöhenmesser mit einem derartigen Eingangsfilter Download PDF

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Publication number
EP0738022A1
EP0738022A1 EP96400743A EP96400743A EP0738022A1 EP 0738022 A1 EP0738022 A1 EP 0738022A1 EP 96400743 A EP96400743 A EP 96400743A EP 96400743 A EP96400743 A EP 96400743A EP 0738022 A1 EP0738022 A1 EP 0738022A1
Authority
EP
European Patent Office
Prior art keywords
filter
resonators
interval
passband
walls
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Withdrawn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
EP96400743A
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English (en)
French (fr)
Inventor
Dominique Podvin
Christian Courtois
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.)
Thales SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0738022A1 publication Critical patent/EP0738022A1/de
Withdrawn legal-status Critical Current

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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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities

Definitions

  • the present invention relates to band pass filters of the cavity type and with comb structure which are, in particular, used as input filters for radio frequency receivers; it also relates to radio receivers, and more particularly radio altimeters, equipped with such filters.
  • the filters used only cause a small insertion loss and have no parasitic bandwidths around the bandwidth.
  • the flanks of the passband are those of a TCHEBYSCHEFF filter, that is to say that they are not very stiff, which is troublesome in certain uses, especially for the flank which limits the high frequencies of the bandwidth.
  • the object of the invention is to avoid or, at the very least, to reduce this drawback without, for this, adding a notch filter in series with the band pass filter considered.
  • a band-pass filter with cavities, with comb structure, of central frequency Fo, comprising a parallelepipedic housing with a first and a second end, two first internal walls parallel to each other and two second internal walls mutually parallel and orthogonal to the first walls and a series assembly with successively the first end, a first interval, a first filter access, a second interval, comb teeth in series, a third interval, a second filter access, a fourth interval and the second end, the access points and the teeth each comprising a bar mounted perpendicular to the first walls, characterized in that n, with n integer and 0 ⁇ n ⁇ 5, of the four intervals each include a resonator mounted perpendicular to the second walls .
  • FIGS. 1 to 4 the corresponding elements are designated by the same symbols.
  • Figures 1 and 2 are respectively a longitudinal sectional view and a bottom view, cover removed, of a bandpass filter, cavity, comb structure, three teeth, according to the prior art.
  • the section according to FIG. 1 has been identified by an axis line corresponding to the projection of the cutting plane in the plane of FIG. 2, and by two arrows XX which indicate which of the two cut planes is drawn. in figure 1.
  • the filter of FIGS. 1 and 2 comprises a parallelepipedal box, of metal, with a hollow part, 1, and a cover, 2.
  • Two metal bars, Be, Bs are integral with the bottom of the hollow part and are arranged perpendicular to this bottom; three adjustment screws, metallic V1, V2, V3, the heads of which are external to the housing, pass right through and perpendicular to the bottom of the hollow part in order to be able to sink more or less deeply inside the housing .
  • the Be bar, the screws V1, V2, V3 and the bar Bs are aligned in this order.
  • Two metal access points Pe, Ps as well as three metal bars B1, B2, B3 are integral with the cover 2.
  • the sockets are arranged in the extension of holes drilled in the cover and the three bars B1, B2, B3, which constitute the three teeth of the comb are mounted perpendicular to the cover.
  • the cables Le, Ls constitute the input and output conductors of the filter according to figures 1 and 2.
  • the bars B1, B2, B3 constitute resonators and the screws V1, V2, V3, disposed respectively opposite the bars B1, B2, B3, constitute the elements for adjusting the resonance frequencies of these resonators.
  • a filter like that of FIGS. 1 and 2 is considered to be a filter with three cavities where the cavities are the spaces in the vicinity of each of the bars B1, B2, B3.
  • the housing 1 and the cover 2 as well as the bars Be, B1, B2, B3 are made of light alloy, chromated on all the walls internal to the waveguide which constitute the housing and lid; as for the adjustment screws V1, V2, V3, they are made of beryllium bronze.
  • the curve Ch is a classic curve of a Chebyshev filter, generally spelled Chebyshev or Chebishev in Anglo-Saxon literature.
  • This kind of filter has a low insertion loss and has no parasitic bandwidths in the cut band; on the other hand, the slope of the transition between the pass band and the cut band is fairly low, in particular compared to that of the Cauer filters; but it is not known to produce these latter filters in mechanical structure, that is to say in the form of cavity filters, in comb; however it is possible to make Cauer's filters in other technologies, for example in microstrips (microstrip in the literature Anglo-Saxon), the drawback is that, in such embodiments, parasitic bandwidths appear in the cut band.
  • Figures 3 and 4 show a bandpass filter obtained by adding to the filter according to Figures 1 and 2, four rejection resonators, R1e, R2e, R1s, R2s which, in the example described, are made of beryllium bronze. It is in fact a question, in these figures, of showing in which positions can be placed rejection resonators to improve the response of the filter; in the example described the improvement sought only required the implementation of the resonators R2e and R2s; in other applications it may prove that a single rejector resonator is sufficient or that it is necessary to use three of them, or even all four.
  • These four resonators are arranged in the vicinity of the input and the output of the filter: R1e between the input bar Be and the end of the waveguide near this bar, R2e between the input bar Be and the resonator B1-V1, R2s between the resonator B3-V3 and the output bar Bs and R1s between the output bar Bs and the end of the waveguide near the bar Bs.
  • FIG. 5 In addition to the curve Ch representative of the amplitude / frequency response of the filter according to FIGS. 1 and 2, a curve Ci representative of the amplitude / frequency response of the filter used for the description, that is to say that is to say, as has been said above, of a filter corresponding to that of FIGS. 3, 4 but without the rejection resonators R1e, R1s.
  • the rejection resonators R2e, R2s are respectively tuned to resonance frequencies of approximately 4.5 and 4.6 GHz, which explains the dips in the curve Ci at these frequencies, dips which are due to the energy taken by these resonators at their tuning frequency.
  • the two rejector resonators are set to tuning frequencies higher than the frequencies of the passband of the filter, that is to say that in fact they function correctly only under these conditions. For tuning frequencies lower than the passband of the filter, a large parasitic passband appears in the response curve, which is generally not desirable.
  • the present invention is not limited to the example described.
  • the comb structure may have a number of teeth other than three.
  • the bars such as Be, Bs and the teeth of the comb instead of being perpendicular to the widest of the longitudinal internal walls of the waveguide, can be perpendicular to the narrowest of these walls; in this case the rejector resonators, to remain orthogonal to them, will be mounted perpendicular to the widest of the longitudinal internal walls of the waveguide.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP96400743A 1995-04-13 1996-04-05 Bandpasshohlraumfilter mit Kammleitungsstruktur und Radiohöhenmesser mit einem derartigen Eingangsfilter Withdrawn EP0738022A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9504467 1995-04-13
FR9504467A FR2733090B1 (fr) 1995-04-13 1995-04-13 Filtre passe-bande a cavites, a structure en peigne et radioaltimetre equipe d'un filtre d'entree de ce type

Publications (1)

Publication Number Publication Date
EP0738022A1 true EP0738022A1 (de) 1996-10-16

Family

ID=9478098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400743A Withdrawn EP0738022A1 (de) 1995-04-13 1996-04-05 Bandpasshohlraumfilter mit Kammleitungsstruktur und Radiohöhenmesser mit einem derartigen Eingangsfilter

Country Status (5)

Country Link
US (1) US5705965A (de)
EP (1) EP0738022A1 (de)
JP (1) JPH08293703A (de)
FR (1) FR2733090B1 (de)
IL (1) IL117579A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102354782A (zh) * 2011-09-20 2012-02-15 电子科技大学 采用电容加载传输线的带阻滤波器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6110257A (en) * 1997-05-16 2000-08-29 Advanced Technology Materials, Inc. Low concentration gas delivery system utilizing sorbent-based gas storage and delivery system
US6611183B1 (en) * 1999-10-15 2003-08-26 James Michael Peters Resonant coupling elements
TW200926576A (en) * 2007-12-10 2009-06-16 Wistron Neweb Corp Down-converter having matching circuits with tuning mechanism coupled to 90 degree hybrid coupler included therein
FI125596B (en) * 2010-11-12 2015-12-15 Intel Corp Customizable resonator filter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1925610A1 (de) * 1968-05-29 1969-12-04 Marconi Co Ltd Filteranordnung,bestehend aus einem Mikrowellenfilter
DE2714181A1 (de) * 1977-03-30 1978-10-05 Siemens Ag Filter fuer sehr kurze elektromagnetische wellen
FR2441927A1 (fr) * 1978-11-20 1980-06-13 Oki Electric Ind Co Ltd Filtre haute frequence
DE3047466A1 (de) * 1980-12-17 1982-07-22 Standard Elektrik Lorenz Ag, 7000 Stuttgart Filter
EP0364931A2 (de) * 1988-10-18 1990-04-25 Oki Electric Industry Co., Ltd. Dielektrisches Filter mit zu einer vorausbestimmten Frequenz abstimmbarem Dämpfungspol

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US3818389A (en) * 1973-09-20 1974-06-18 Bell Telephone Labor Inc Dual interdigital filter for microwave mixer
US3955161A (en) * 1974-08-05 1976-05-04 General Dynamics Corporation Molded waveguide filter with integral tuning posts
FR2461263A1 (fr) * 1979-07-13 1981-01-30 Trt Telecom Radio Electr Amelioration du calibrage dans un radioaltimetre
EP0038996B1 (de) * 1980-04-28 1984-06-27 Oki Electric Industry Company, Limited Hochfrequenzfilter
JPS5739601A (en) * 1980-08-22 1982-03-04 Fujitsu Ltd High frequency filter
JPS58170101A (ja) * 1982-03-30 1983-10-06 Nippon Dengiyou Kosaku Kk 帯域通過ろ波器
US4937533A (en) * 1989-08-16 1990-06-26 Rockwell International Corporation Deformable diplexer filter signal coupling element apparatus
FI88979C (fi) * 1990-12-17 1993-07-26 Telenokia Oy Hoegfrekvensbandpassfilter
FR2674078B1 (fr) * 1991-03-12 1994-10-07 Thomson Trt Defense Emetteur-recepteur hyperfrequence utilisant la technique des circuits imprimes multicouches.
FI88830C (fi) * 1991-05-24 1993-07-12 Telenokia Oy Comb-line-hoegfrekvensfilter
US5428325A (en) * 1993-12-10 1995-06-27 Allen Telecom Group, Inc. RF filters and multiplexers with resonator decouplers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1925610A1 (de) * 1968-05-29 1969-12-04 Marconi Co Ltd Filteranordnung,bestehend aus einem Mikrowellenfilter
DE2714181A1 (de) * 1977-03-30 1978-10-05 Siemens Ag Filter fuer sehr kurze elektromagnetische wellen
FR2441927A1 (fr) * 1978-11-20 1980-06-13 Oki Electric Ind Co Ltd Filtre haute frequence
DE3047466A1 (de) * 1980-12-17 1982-07-22 Standard Elektrik Lorenz Ag, 7000 Stuttgart Filter
EP0364931A2 (de) * 1988-10-18 1990-04-25 Oki Electric Industry Co., Ltd. Dielektrisches Filter mit zu einer vorausbestimmten Frequenz abstimmbarem Dämpfungspol

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 174 (E - 190)<1319> 2 August 1983 (1983-08-02) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102354782A (zh) * 2011-09-20 2012-02-15 电子科技大学 采用电容加载传输线的带阻滤波器
CN102354782B (zh) * 2011-09-20 2014-05-21 电子科技大学 采用电容加载传输线的带阻滤波器

Also Published As

Publication number Publication date
FR2733090A1 (fr) 1996-10-18
US5705965A (en) 1998-01-06
JPH08293703A (ja) 1996-11-05
IL117579A (en) 1998-10-30
IL117579A0 (en) 1996-07-23
FR2733090B1 (fr) 1997-05-23

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