EP0423667A1 - Mikrowellen-Bandfilter in Kammleitungsform - Google Patents

Mikrowellen-Bandfilter in Kammleitungsform Download PDF

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Publication number
EP0423667A1
EP0423667A1 EP90119681A EP90119681A EP0423667A1 EP 0423667 A1 EP0423667 A1 EP 0423667A1 EP 90119681 A EP90119681 A EP 90119681A EP 90119681 A EP90119681 A EP 90119681A EP 0423667 A1 EP0423667 A1 EP 0423667A1
Authority
EP
European Patent Office
Prior art keywords
line
filter
low impedance
band filter
comb
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Withdrawn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
EP90119681A
Other languages
English (en)
French (fr)
Inventor
Jean-Claude Cruchon
Jean-Denis Schubert
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.)
Alcatel CIT SA
Alcatel Lucent NV
Original Assignee
Alcatel Telspace SA
Alcatel Transmission par Faisceaux Hertziens SA
Alcatel NV
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 Alcatel Telspace SA, Alcatel Transmission par Faisceaux Hertziens SA, Alcatel NV filed Critical Alcatel Telspace SA
Publication of EP0423667A1 publication Critical patent/EP0423667A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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 a band filter for microwave frequencies, this band filter being of the comb filter or "COMB-LINE" type.
  • the comb filter or "Comb-Line” is the distributed constant filter which offers the best compromise, for a reduced bulk, between insertion losses and parasitic responses.
  • This type of filter has the disadvantage of having a band frozen once and for all according to its particular physical realization.
  • it is generally necessary to have two bandwidths (in general 36 and 72 MHz), which means that two types of comb filters of radically dimensions must be provided. different.
  • the use of comb filters is strongly desired, because of the reduced dimensions of this kind of filter, necessary for the integration of the frequency transpositions used in C and KU bands.
  • the invention aims to remedy this drawback.
  • a band filter for microwave of the comb filter type comprising several portions of parallel line of equal lengths, each having a first end short-circuited to ground along a first line perpendicular to the direction of said portions of line, characterized in that these line portions each have their second end, free, connected to ground by a tuning capacity, coupling capacities constituting respectively the input and output members of this filter, and in this that said filter comprises a low impedance common line which connects the first ends of these line portions along a second line parallel to the first such that the edge farthest from said common line with respect to the first line is at a determined distance from this one.
  • the filter represented in FIG. 2 is derived from the conventional comb filter of FIG. 1 by interposing, at the ground feet of the five fingers 1 to 5 of this filter, a common line 9 at low impedance between these fingers 1 to 5 and the mass.
  • the line 9 has a width L substantially equal to that of the filter, and a length l of the same order of magnitude as the width of each of the fingers 1 to 5.
  • This line 9 is, in this embodiment, reported by welding on the ground feet of the five fingers 1 to 5. It is then observed that the pass band of the comb filter, which was for example (in the case of FIG. 1) of the order of 15 to 17 MHz, passes (in the case of Figure 2) at about 36 Megahertz. It is observed that with this new filter (FIG. 2), the performance of adaptation to the accesses is preserved, a readjustment of the frequency tuning capacities 6 being however necessary due to the decrease in the characteristic impedance of the fingers 1 to 5.
  • FIG. 3 shows a filter produced in the same way as that of FIG. 2, but this time interposing a low-impedance line 10 of the same width L but of length l ′ double that of, 9, of this FIG. 2 We then observe that the bandwidth of this other new filter is even wider, reaching around 72 Megahertz.
  • FIG. 4 A very convenient embodiment of a filter with the same performance as that of FIG. 2 is shown in FIG. 4: it is simply produced by welding together, at a distance l from the mass, on the side of the "feet of mass "of the fingers 1 to 5, a tinned wire 11 parallel to the ground plane, the wire 11 replacing, from the electrical point of view, the metal strip 9 of FIG. 2.
  • FIG. 5 shows that it is possible to simply produce a filter of the same performance as that of FIG. 3 by relating this same wire 11 to the distance l ′ with respect to the mass.
  • FIGS. 6 and 7 respectively show an embodiment of the filters according to FIGS. 2 and 3, by total integration of the low impedance lines 9 and 10 into the structure of the filter, without discontinuities, the assemblies (1 to 5 and 9 ) and (1 to 5 and 10) each being made of a single block.
  • This type of filter lends itself as well to production by ribbon lines, by tri-plate technology, as by integrated technology (possible application in MMIC).
  • the attached tapes 9, 10 can be welded, screwed, or thermocompressed.
  • FIGS. 8 and 9 show a practical embodiment in tri-plate technology.
  • a box 15 is conventionally provided both for this comb filter and for the remaining part of the circuit (such as for example a Group Propagation Time Corrector).
  • the comb filter itself is closed by a screwed cover 16 (screws 17 and 18), while a cover 20 closes, thanks to the screws 18 and 19, the housing itself 15.
  • the filter which has just been described allows: - the choice of the location of a specific band; - easy modification of bandwidth during the life of the product; - to achieve the best compromise, for very wide bandwidths, between the sensitivity of the couplings, linked to the positioning accuracy of two fingers, and the physical production of the line at low impedance (for a maximum capacity value).
  • MMIC application is especially interesting for the realization of integrated filters (from 500 MHz to 3 GHz in bandwidth), for future integrations between 3 and 20 GHz.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Filters And Equalizers (AREA)
EP90119681A 1989-10-20 1990-10-15 Mikrowellen-Bandfilter in Kammleitungsform Withdrawn EP0423667A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8913785 1989-10-20
FR8913785A FR2653597B1 (fr) 1989-10-20 1989-10-20 Filtre de bande pour hyperfrequences du type filtre en peigne.

Publications (1)

Publication Number Publication Date
EP0423667A1 true EP0423667A1 (de) 1991-04-24

Family

ID=9386626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90119681A Withdrawn EP0423667A1 (de) 1989-10-20 1990-10-15 Mikrowellen-Bandfilter in Kammleitungsform

Country Status (3)

Country Link
EP (1) EP0423667A1 (de)
JP (1) JPH03145301A (de)
FR (1) FR2653597B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6597265B2 (en) * 2000-11-14 2003-07-22 Paratek Microwave, Inc. Hybrid resonator microstrip line filters
US6686817B2 (en) * 2000-12-12 2004-02-03 Paratek Microwave, Inc. Electronic tunable filters with dielectric varactors

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2777156B1 (fr) 1998-04-09 2000-06-30 Fabrice Ponsin Nouvel ensemble support/litiere pour animal domestique, jetable par fraction
CN102386466A (zh) * 2011-08-24 2012-03-21 成都赛纳赛德科技有限公司 可调梳形滤波器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627870A (en) * 1945-11-08 1949-08-17 Hazeltine Corp Wave-signal filter system
DE1297719B (de) * 1967-01-12 1969-06-19 Stassfurt Fernsehgeraete Abstimmbare Leitungskreise fuer hochfrequente elektrische Schwingungen in Streifenleitertechnik
GB1299327A (en) * 1971-05-26 1972-12-13 Microwave Dev Lab Inc Semi-lumped comb line filter
US4721931A (en) * 1986-05-02 1988-01-26 Murata Manufacturing Co., Ltd. Stripline filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627870A (en) * 1945-11-08 1949-08-17 Hazeltine Corp Wave-signal filter system
DE1297719B (de) * 1967-01-12 1969-06-19 Stassfurt Fernsehgeraete Abstimmbare Leitungskreise fuer hochfrequente elektrische Schwingungen in Streifenleitertechnik
GB1299327A (en) * 1971-05-26 1972-12-13 Microwave Dev Lab Inc Semi-lumped comb line filter
US4721931A (en) * 1986-05-02 1988-01-26 Murata Manufacturing Co., Ltd. Stripline filter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MICROWAVE JOURNAL. vol. 22, no. 12, décembre 1979, DEDHAM US pages 60 - 61; J.A.G.MALHERBE: "AN ETCHED DIGITAL ELLIPTIC FILTER" *
QST AMATEUR RADIO. vol. 52, no. 12, décembre 1968, NEWINGTON US pages 44 - 45; R.E.FISHER: "Combline V.H.F. bandpass filters" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6597265B2 (en) * 2000-11-14 2003-07-22 Paratek Microwave, Inc. Hybrid resonator microstrip line filters
US6686817B2 (en) * 2000-12-12 2004-02-03 Paratek Microwave, Inc. Electronic tunable filters with dielectric varactors

Also Published As

Publication number Publication date
FR2653597B1 (fr) 1992-01-24
FR2653597A1 (fr) 1991-04-26
JPH03145301A (ja) 1991-06-20

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