EP0193162A1 - Mikrowellenbandpassfilter - Google Patents

Mikrowellenbandpassfilter Download PDF

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Publication number
EP0193162A1
EP0193162A1 EP86102410A EP86102410A EP0193162A1 EP 0193162 A1 EP0193162 A1 EP 0193162A1 EP 86102410 A EP86102410 A EP 86102410A EP 86102410 A EP86102410 A EP 86102410A EP 0193162 A1 EP0193162 A1 EP 0193162A1
Authority
EP
European Patent Office
Prior art keywords
resonators
filter
elements
resonator
line
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.)
Granted
Application number
EP86102410A
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English (en)
French (fr)
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EP0193162B1 (de
Inventor
Jean-Claude Cruchon
Gilbert Prost
Jean-Pierre Marquet
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 Transmission par Faisceaux Hertziens SA
Original Assignee
Alcatel Thomson Faisceaux Hertziens SA
Alcatel Transmission par Faisceaux Hertziens SA
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Application filed by Alcatel Thomson Faisceaux Hertziens SA, Alcatel Transmission par Faisceaux Hertziens SA filed Critical Alcatel Thomson Faisceaux Hertziens SA
Publication of EP0193162A1 publication Critical patent/EP0193162A1/de
Application granted granted Critical
Publication of EP0193162B1 publication Critical patent/EP0193162B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01P1/203—Strip line filters

Definitions

  • the present invention relates to bandpass filters for microwave frequencies, and, in particular, broadband filters and filters produced with ribbon waveguides.
  • microwave bandpass filters for example in the technology of ribbon waveguides (stripline or microstrip in Anglo-Saxon literature), by combining in series a lowpass filter and a pass filter -high ;
  • the low-pass filter consists of a succession of sections of thin lines and sections of wide lines which respectively constitute the inductive and capacitive elements of the filter;
  • the high-pass filter comprises sections of thin lines connected to ground, which constitute set elements and which are connected to each other by open circuit lines or capacitors-
  • Such filters require a large number of poles in the pass filter -bas and in the high-pass filter, that is to say a large number of line sections; they are therefore bulky and expensive.
  • band-pass filters are produced by means of successive resonators, placed between the inlet and the outlet of the filter and very strongly coupled together; the resonators are very close to each other so as to obtain the strong coupling.
  • Such filters are difficult to manufacture, even in ribbon waveguide technology, when the desired coupling requires a space between two successive resonators of less than 100 microns; indeed, this coupling must be perfectly constant from one filter to another to maintain the same characteristics for all filters of the same production.
  • the object of the present invention is to avoid, or at least to reduce the aforementioned drawbacks.
  • a bandpass filter for microwave comprising, in series from the electrical point of view, n + 2 elements (n: positive integer) constituted by an input line, n linear resonators, open to both ends and all substantially of given length ⁇ b / 2 and an output line, the resonators being ordered from the first to the n me respectively between the input line and the output line, is characterized by the combination of n + capacitive couplings for coupling respectively the input line at the first end of the first resonator, the second ends of the i the resonators at the first ends of the (i + 1) my resonators (with i integer ranging from 1 inclusive to n-1 inclusive) and the second end from the n me resonator to the output line, and at least one pair of linear resonators of length ⁇ s / 4 - ( ⁇ s wavelength to reject, less than ab), the resonators of a pair each having one end connected to one of the n + 2 elements e t
  • FIG. 1 represents a filter according to the invention: this filter, produced in waveguides with ribbons, comprises a support, P, made of polytetrafluoroethylene glass (better known under the registered trademark "teflon glass") constituted by a rectangular plate 45 x 65 mm and 1.6 mm thick.
  • the hidden face of the support P is entirely covered by a copper deposit which constitutes a ground plane; on the visible side of the copper deposits A, 1 to 7, 10, 11, 70, 71, B respectively constitute an input line, seven linear resonators open at their two ends, four linear, auxiliary, short-circuit resonators at one of their ends and an exit line.
  • the filter according to FIG. 1 is a filter of the type with parallel lines, in fact the resonators 1 to 7 are constituted by sections of lines in parallel to reduce the size of the filter; these sections are arranged between the input and output lines, A and B.
  • the resonators 1 to 7 are resonators of the half-wave line type, all substantially of length ⁇ b / 2 or ⁇ b is the wavelength corresponding to the center frequency of the filter bandwidth.
  • variable capacitors CO to C7 respectively connect line A to the first end of the resonator 1, the second end of the resonator 1 at the first end of the resonator 2, ..., the second end of the resonator 6 at the first end of the resonator 7 and the second end of the resonator 7 at line B; the line sections 1 to 7, with the capacitors C1 to C6, thus form a zigzag assembly.
  • auxiliary resonators 10, 11, 70, 71, of quarter-wave line type are mounted in short circuit by connection of one of their ends to the resonator 1 for 10 and 11 and to the resonator 7 for 70 and 71.
  • These short-circuit resonators are intended to provide a notch function in the filter so that, as will appear in FIG. 2, the amplitude / frequency response curve of the filter has a bandwidth with a steeper edge in high frequency limit; for this the length of these auxiliary resonators is chosen to be equal to X s / 4 where X s is a wavelength to be rejected, less than ⁇ b and corresponding substantially to the central frequency of the frequency band to be eliminated by the cut function -bandaged.
  • auxiliary resonators are associated in pairs, 10-11 and 70-71 and the resonators of the same pair are arranged at a distance equal to (2 k + 1 ) ⁇ b / 4 from each other with k positive integer taken, in the example described, equal to 1; the choice of this distance between the auxiliary resonators allows mutual compensation, in the bandwidth of the filter, of the inductive and capacitive disturbances brought by each of the resonators of the same pair.
  • the auxiliary resonators of this cut-off function strip can practically be arranged in any place of the electrical path which connects the two accesses of the filter, as long as, between them, the distance of (2k + 1) ⁇ b / 4 is respected.
  • the filter which has just been described has a bandwidth at 3 decibels which goes from 950 to 1700 MHz with, on both sides, a rapid attenuation up to 30 decibels.
  • FIG. 2 is a graphic representation of amplitude / frequency responses relating to the circuit of figure 1.
  • Three curves, G1, G2, G3, have been represented.
  • the answer is that sought for the low frequencies but, on the side of the high frequencies, the attenuation is not fast enough and strong enough.
  • the curve G3 relates to the amplitude / frequency response of the circuit described using FIG. 1; the comparison of this curve with the curve G2 shows that the addition of the notch filter, presenting a cut band centered on approximately 2300 MHz and obtained thanks to the quarter wave lines whose resonance frequencies are chosen in the band 1850 -2500 MHz, has the effect of causing a sudden loss variation near the high frequencies of the bandpass filter: loss of less than 3 decibels below 1750 MHz and loss of the order of 20 to 30 decibels for frequencies from 1800 MHz to more than 2500 MHz; this attenuation becomes less important again for frequencies of the order of 2700 MHz and more, but these frequencies are sufficiently distant from the frequencies of the passband (950-1700 MHz) so that it can result in a drawback in the majority of cases use of the filter.
  • FIG. 1 Another embodiment of a filter according to the invention is described with the aid of Figures 3 to 5; it is in fact a filter having the same characteristics as the filter according to FIG. 1 but produced in two layers plus a ground plane on flexible supports and in which the capacitors corresponding to the capacitors C1 to C6 of FIG. 1, are obtained by overlapping the ends of lines separated by the thickness of a flexible support.
  • Figure 3 shows a flexible support in polyamide, S1, on which five copper deposits have been made: A, 1 + 1 0 and 11, 3, 5, 7 + 70 and 71, B.
  • Figure 4 shows another flexible polyamide support, S2, on which three copper deposits have been made: 2, 4, 6.
  • the supports S1 and S2 are two rectangular plates of 35 x 144 mm which are then glued to each other, to give the assembly shown in Figure 5; under the plates S1 and S2 is also bonded a ground plane constituted by a polyamide support covered, on a surface, by a copper deposit; this ground plane is not visible in FIG. 5.
  • the input and output lines are designated respectively by the letters A and B while the resonators in half-wave lines have the marks 1 to 7 and that the resonators, in quarter lines d wave, of the notch function, bear the marks 10, 11, 70, 71.
  • the capacitive couplings between the line A and the resonator 1 and between the resonator 7 and the line B are respectively provided by the capacitors CO and C7 .
  • the couplings between the half-wave resonators are obtained by placing the ends to be coupled face to face; the facing surfaces, separated by the dielectric from the polyamide support, thus form the two plates of the coupling capacitors; these capacitors bear the references C1 to C6 in FIG. 5.
  • the filter can be designed in a tri-plate structure, that is to say with the resonators arranged in the space separating two parallel ground planes.
  • the capacitors C1 to C7 can be obtained by means of metal tongues deposited on a dielectric substrate; these tabs are arranged so that, for example to replace the capacitor C1 of FIG. 1, the two ends of the tab are respectively opposite the ends of the resonators 1 and 2 to which the capacitor C1 was connected; the facing surfaces determine the coupling between the successive resonators.
  • Capacitors such as CO and C7 can also be obtained by this technique of facing copper surfaces or by that presented in Figure 5; or equivalent; this is possible by giving the ends opposite sufficient surfaces taking into account the thickness and the permittivity of the dielectric which separates them and the capacity to obtain.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP86102410A 1985-02-27 1986-02-25 Mikrowellenbandpassfilter Expired - Lifetime EP0193162B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8502850 1985-02-27
FR8502850A FR2578104B1 (fr) 1985-02-27 1985-02-27 Filtre passe-bande pour hyperfrequences

Publications (2)

Publication Number Publication Date
EP0193162A1 true EP0193162A1 (de) 1986-09-03
EP0193162B1 EP0193162B1 (de) 1990-06-13

Family

ID=9316682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102410A Expired - Lifetime EP0193162B1 (de) 1985-02-27 1986-02-25 Mikrowellenbandpassfilter

Country Status (6)

Country Link
US (1) US4731596A (de)
EP (1) EP0193162B1 (de)
JP (1) JPS6284601A (de)
DE (1) DE3672035D1 (de)
FR (1) FR2578104B1 (de)
NO (1) NO169366C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0368661A2 (de) * 1988-11-11 1990-05-16 Matsushita Electric Industrial Co., Ltd. Mikrowellenfilter
EP0373028A1 (de) * 1988-11-30 1990-06-13 Thomson Hybrides Passives Bandpassfilter
ES2091713A2 (es) * 1994-02-15 1996-11-01 Follente Emilio Diez Red de filtro de paso de banda de frecuencias por efecto de la induccion de corrientes inversas en segmentos de lineas impresas.
EP0800224A3 (de) * 1996-04-01 1998-07-29 Matsushita Electric Industrial Co., Ltd. Empfangsvorrichtung

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0432803Y2 (de) * 1986-05-08 1992-08-06
FR2613557A1 (fr) * 1987-03-31 1988-10-07 Thomson Csf Filtre comportant des elements a constantes reparties associant deux types de couplage
US5231349A (en) * 1988-05-20 1993-07-27 The Board Of Trustees Of The Leland Stanford Junior University Millimeter-wave active probe system
JPH0728163B2 (ja) * 1988-11-11 1995-03-29 松下電器産業株式会社 マイクロ波フイルタ
JPH0728162B2 (ja) * 1988-11-11 1995-03-29 松下電器産業株式会社 マイクロ波フイルタ
US7231238B2 (en) 1989-01-13 2007-06-12 Superconductor Technologies, Inc. High temperature spiral snake superconducting resonator having wider runs with higher current density
GB2246670B (en) * 1990-08-03 1995-04-12 Mohammad Reza Moazzam Microstrip coupled lines filters with improved performance
US5138288A (en) * 1991-03-27 1992-08-11 Motorola, Inc. Micro strip filter having a varactor coupled between two microstrip line resonators
JPH07106815A (ja) * 1993-08-09 1995-04-21 Oki Electric Ind Co Ltd ストリップライン共振器
GB2382233A (en) * 2001-08-08 2003-05-21 Koninkl Philips Electronics Nv Hybrid filter
EP1428289A1 (de) * 2001-09-20 2004-06-16 Paratek Microwave, Inc. Abstimmbare filter mit variabler bandbreite und variabler verzögerung
US7034636B2 (en) * 2001-09-20 2006-04-25 Paratek Microwave Incorporated Tunable filters having variable bandwidth and variable delay
JP3766791B2 (ja) * 2001-10-12 2006-04-19 シャープ株式会社 高周波フィルタ回路および高周波通信装置
US20030222732A1 (en) * 2002-05-29 2003-12-04 Superconductor Technologies, Inc. Narrow-band filters with zig-zag hairpin resonator
JP4565145B2 (ja) * 2005-09-02 2010-10-20 独立行政法人情報通信研究機構 超広帯域バンドパスフィルタ
JP4565146B2 (ja) * 2005-09-06 2010-10-20 独立行政法人情報通信研究機構 マルチバンド超広帯域バンドパスフィルタ
TWI352447B (en) * 2008-01-04 2011-11-11 Hon Hai Prec Ind Co Ltd Ultra wide-band filter
TW201212371A (en) * 2010-09-10 2012-03-16 Universal Scient Ind Shanghai Micro band-pass filter
FR2977382A1 (fr) * 2011-06-29 2013-01-04 Thomson Licensing Filtre stop bande a rejection elevee et duplexeur utilisant de tels filtres
US9467116B2 (en) * 2011-12-19 2016-10-11 Intel Corporation Broad band diplexer using suspended strip-line capacitor technology

Citations (4)

* 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
EP0071509A1 (de) * 1981-07-24 1983-02-09 Thomson-Csf Bandpassfilter mit beidseitig leerlaufenden linearen Resonatoren
FR2525835A1 (fr) * 1982-04-27 1983-10-28 Thomson Csf Filtre passe-bande a resonateurs lineaires, auquel est associee une fonction coupe-bande
US4418324A (en) * 1981-12-31 1983-11-29 Motorola, Inc. Implementation of a tunable transmission zero on transmission line filters

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DE1591581C3 (de) * 1967-10-12 1975-10-23 Siemens Ag, 1000 Berlin Und 8000 Muenchen Mikrowellen-Schattkreis in Triplate-Technik
US3605045A (en) * 1969-01-15 1971-09-14 Us Navy Wide-band strip line frequency-selective circuit
JPS5275951A (en) * 1975-12-20 1977-06-25 Matsushita Electric Ind Co Ltd Microwave circuit equipment
JPS5370739A (en) * 1976-12-07 1978-06-23 Fujitsu Ltd Blocking filter for strip line band
DE2714181A1 (de) * 1977-03-30 1978-10-05 Siemens Ag Filter fuer sehr kurze elektromagnetische wellen
FR2431773A1 (fr) * 1978-07-21 1980-02-15 Thomson Csf Filtre hyperfrequence a resonateurs en dielectrique et materiel pour telecommunications muni d'un tel filtre
FR2510325B1 (fr) * 1981-07-24 1987-09-04 Thomson Csf Filtre hyperfrequence de petites dimensions, a resonateurs lineaires
JPS58166803A (ja) * 1982-03-27 1983-10-03 Fujitsu Ltd 誘電体フイルタ
JPS5974701A (ja) * 1982-10-20 1984-04-27 Murata Mfg Co Ltd フイルタ装置
JPS58223902A (ja) * 1982-06-21 1983-12-26 Nippon Telegr & Teleph Corp <Ntt> ストリツプ共振器
JPS5986306A (ja) * 1982-11-09 1984-05-18 Toshiba Corp バンドパスフイルタ
FR2540294B1 (fr) * 1983-01-31 1985-10-04 Thomson Csf Filtre hyperfrequence a resonateurs lineaires
JPS59191902A (ja) * 1983-04-15 1984-10-31 Hitachi Ltd フイルタ

Patent Citations (4)

* 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
EP0071509A1 (de) * 1981-07-24 1983-02-09 Thomson-Csf Bandpassfilter mit beidseitig leerlaufenden linearen Resonatoren
US4418324A (en) * 1981-12-31 1983-11-29 Motorola, Inc. Implementation of a tunable transmission zero on transmission line filters
FR2525835A1 (fr) * 1982-04-27 1983-10-28 Thomson Csf Filtre passe-bande a resonateurs lineaires, auquel est associee une fonction coupe-bande

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. MTT-22, no. 5, mai 1974, pages 499-504, IEEE, New York, US; E.G. CRISTAL et al.: "A compact channel-dropping filter for stripline and microwave integrated circuits" *
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. MTT-31, no. 5, mai 1983, pages 397-402, IEEE, New York, US; C.I. MOBBS et al.: "A generalized chebyshev suspended substrate stripline bandpass filter" *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0368661A2 (de) * 1988-11-11 1990-05-16 Matsushita Electric Industrial Co., Ltd. Mikrowellenfilter
EP0368661A3 (en) * 1988-11-11 1990-11-28 Matsushita Electric Industrial Co., Ltd. Microwave filter
US5015976A (en) * 1988-11-11 1991-05-14 Matsushita Electric Industrial Co., Ltd. Microwave filter
EP0373028A1 (de) * 1988-11-30 1990-06-13 Thomson Hybrides Passives Bandpassfilter
FR2648641A2 (fr) * 1988-11-30 1990-12-21 Thomson Hybrides Filtre passif passe-bande
ES2091713A2 (es) * 1994-02-15 1996-11-01 Follente Emilio Diez Red de filtro de paso de banda de frecuencias por efecto de la induccion de corrientes inversas en segmentos de lineas impresas.
EP0800224A3 (de) * 1996-04-01 1998-07-29 Matsushita Electric Industrial Co., Ltd. Empfangsvorrichtung
US6072999A (en) * 1996-04-01 2000-06-06 Matsushita Electric Industrial Co., Ltd. Receiving apparatus

Also Published As

Publication number Publication date
FR2578104B1 (fr) 1987-03-20
NO169366B (no) 1992-03-02
FR2578104A1 (fr) 1986-08-29
NO169366C (no) 1992-06-10
US4731596A (en) 1988-03-15
NO860694L (no) 1986-08-28
JPS6284601A (ja) 1987-04-18
DE3672035D1 (de) 1990-07-19
EP0193162B1 (de) 1990-06-13

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