EP0071509A1 - Bandpassfilter mit beidseitig leerlaufenden linearen Resonatoren - Google Patents

Bandpassfilter mit beidseitig leerlaufenden linearen Resonatoren Download PDF

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Publication number
EP0071509A1
EP0071509A1 EP82401308A EP82401308A EP0071509A1 EP 0071509 A1 EP0071509 A1 EP 0071509A1 EP 82401308 A EP82401308 A EP 82401308A EP 82401308 A EP82401308 A EP 82401308A EP 0071509 A1 EP0071509 A1 EP 0071509A1
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EP
European Patent Office
Prior art keywords
resonators
filter
resonator
frequency
open
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
EP82401308A
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English (en)
French (fr)
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EP0071509B1 (de
Inventor
Marie-Christine Henriot
Patrick Janer
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Thales SA
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Thomson CSF SA
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF 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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20372—Hairpin resonators

Definitions

  • the present invention relates to bandpass filters produced by means of linear resonators open at their two ends, such as hair pin resonators (hair pin resonators in Anglo-Saxon literature) also called U resonators, and such as straight resonators, formed by a straight section of line. It is recalled on this subject that these resonators, also called resonators in 2, being open at their two ends, resonate on a frequency corresponding, in the filter, to a wavelength ⁇ equal to twice the electrical length of the resonator; the bandwidth of the filter is centered on this resonant frequency.
  • linear resonators open at their two ends
  • hair pin resonators hair pin resonators in Anglo-Saxon literature
  • straight resonators formed by a straight section of line.
  • the object of the present invention is to avoid having to use two filters.
  • a bandpass filter with n linear resonators open at both ends called ⁇ 2 resonators (n: positive integer; ⁇ : mean wavelength of the passband in the filter), is mainly characterized in that, to each of p (p integer at least equal to 1 and at most equal to n) resonators in 2 is connected, in the vicinity of its medium, that is to say where the electric field at its minimum value, an additional resonator whose resonant frequency is a frequency to be rejected thanks to this additional resonator.
  • FIG. 1 is a schematic view of a band-pass filter produced using U-shaped resonators.
  • This filter comprises two access lines A 1 A 2 , parallel in them and, between these two lines, five resonators in U, H 1 to H 4 , whose vertical bars of the U are parallel to the lines A 1 A 2 .
  • the length of the U-shaped resonators, H 1 to H 4 is ⁇ 2 ( ⁇ being the wavelength corresponding to the average frequency of the pass band of the band pass filter).
  • the resonators H 1 and H 4 are associated respectively with two U-shaped resonators, P 1 and P 4 , the length of which is equal to ⁇ 2 ( ⁇ 'being a wavelength corresponding to a frequency to be rejected in the filter).
  • the ports such as A and A 2 and the resonators such as H 1 to H 4 and P 1 , P 4 are constituted by metal deposits placed on one side of a dielectric substrate, the other side of which is covered with a metal sheet forming a ground plane.
  • the dielectric substrate and the metal sheet do not appear in FIG. 1 for the sake of simplification.
  • the diagram in FIG. 1, without the resonators P 1 and P 4 corresponds to a bandpass filter of conventional type.
  • the coupling coefficient existing between two resonators is defined by the distance which separates them, by their line width and by the distance which separates the two branches of the same resonator.
  • the resonators being open at their two ends, their resonant frequency is the frequency corresponding to the wavelength ⁇ in the filter, where ⁇ is as indicated above equal to twice the length of the resonators H 1 to H 4 .
  • a notch function was obtained in the filter according to FIG. 1 by the two U-shaped resonators, P 1 and P 4 , placed respectively on the back of the resonators H 1 and H 4 , that is to say placed so to have the horizontal bar of the U common with that of the resonators H 1 and H 4 .
  • the resonators P 1 and P4 bring practically no modification of the characteristics of the band-pass filter obtained thanks to the resonators H 1 at H 4 ; and these resonators P 1 and P 4 behave like a notch filter put in series with the band pass filter.
  • FIG. 2 is a diagram differing from that according to FIG. 1 only by the fact that the resonators P 1 and P 4 are replaced by resonators of shorter length. , P ' 1 , P' 4 , but at the ends of which are connected respectively two variable capacitors C 1 , C 4 adjusted so as to give the sets P ' 1 C 1 and P' 4 C 4 an electrical length equal to half the length ⁇ 'which was discussed in Figure 1 (At' wavelength in the filter corresponding to the frequency to be rejected by the filter).
  • FIG. 3 is the diagram of a filter according to the invention which differs from the filter of FIG. 1 by the replacement of the resonators P l and P 4 of the U type by two simple resonators Q 1 Q 4 , that is to say ie by resonators each having only one of their ends isolated; at their other end, these two simple resonators are respectively connected substantially in the middle of the horizontal bar of the resonators H 1 and H 4 .
  • These simple resonators Q 1 and Q 4 are formed by pieces of line of length where ⁇ 'is the wavelength in the filter corresponding to the frequency to be rejected.
  • ⁇ ' is the wavelength in the filter corresponding to the frequency to be rejected.
  • the invention does not only apply to filters of the bandpass type with U-shaped resonators, it also applies as shown in FIG. 4 to bandpass filters with parallel lines.
  • Figure 4 shows such a filter; this filter comprises an input line A and an output line A 2 parallel to each other and between these lines four straight resonators, L to L 4 , of length equal to ⁇ 2 ( ⁇ wavelength corresponding to the average frequency of the filter bandwidth), open at both ends.
  • Four simple resonators Q 1 to Q 4 of length equal to ⁇ '4 ( ⁇ ' wavelength in the filter corresponding to a frequency to be rejected by this filter) are respectively connected, at one of their ends, in the middle of the straight resonators L to L 4 .
  • the added resonators (Q 1 to Q 4 ) bring about a notch function at the frequency corresponding to the wavelength ⁇ '. Also, as in the case of the previous figures, these added resonators are connected in the middle of the resonators giving the bandpass function, that is to say where the electric field has its minimum value, so as not to disturb the bandpass function of the filter.
  • FIG 5 is a detailed view of a filter according to the invention corresponding to the type shown in the diagram of Figure 3; a graduated scale from 0 to 1cm is placed next to the filter to show the enlargement ratio of the drawing.
  • FIG. 5 also appear two short circuits, K 1 and K 2 , connected respectively between the access line A 1 and the resonator H 1 and between the access line A 2 and the resonator H 6 ; these short circuits have have been studied to adapt the impedance of the filter according to the circuit in which this filter is intended to be mounted.
  • the filter comprises on the hidden face of the dielectric substrate 2 a metal sheet electrically connected to the housing 1 and serving as a ground plane; the external conductor of the plugs 11 and 12 is also electrically connected to the housing 1.
  • FIG. 6 is a graph showing the attenuation A brought, as a function of the frequency, by the filter according to FIG. 5 (curve G 1 in solid lines) and showing the attenuation brought by the bandpass filter according to the art known corresponding to the filter of Figure 5, that is to say without the resonators Q 1 and Q 6 (curve G 0 in dashed lines).
  • the curve G 0 shows that the conventional filter (without the resonators Q I and Q 6 ) has a bandwidth, centered on an average frequency of 825 MHz, which is the useful bandwidth of the filter, that is to say the bandwidth for which it was designed; this conventional filter also has a bandwidth whose lower frequency is at 1200 MHz and which constitutes a parasitic bandwidth which can be troublesome in certain applications.
  • the curve G 1 in FIG. 6 shows that the addition of the resonators Q I and Q 6 to the other elements of the filter in FIG. 5 makes it possible to eliminate this parasitic pass band by performing a band-cut function.
  • bandpass circuits can be envisaged without departing from the scope of the invention.
  • resonators identical to the resonators P and P 4 can be associated with the resonators H 2 and H 3 .
  • the strip cutter function it is possible to connect on some of the resonators in ⁇ 2 (H 1 H 2 H 3 H4) of figure 1 or of figure 3 resonators in U and on others of these resonators in ⁇ 2 of the simple resonators in 4 such as Q I and Q 4 ( Figure 3).
  • Q I and Q 4 Figure 3
  • fixed capacitors can be mounted obtained at the same time and in the same way as the resonators, that is to say by deposition metallic on a wafer or from a metallic wafer from which part of the metallic layer has been removed by chemical or mechanical attack; these fixed capacitors then consist of a row of parallel tongues arranged between the branches of the U of the resonators P 'and P' 4 , perpendicular to these branches, two successive tongues being respectively integral with the two branches of the U.
  • the central frequency of the notch function which is integrated in a band pass filter can be just as much a frequency higher than the pass band of the band pass filter, as a lower frequency, or even that a frequency included in this bandwidth; it suffices to determine the electrical length of the resonators which produce this notch function, as a function of the wavelength of the central frequency of the notch function to be obtained.
  • the number of resonators intended to add a predetermined notch function in a bandpass filter with linear resonators can be chosen between 1 and n, n being the number of resonators defining the bandpass function of the filter considered; the choice of the number and the position of the resonators intended to add the notch function is a means of acting on the shape of the response curve of the filter.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP82401308A 1981-07-24 1982-07-09 Bandpassfilter mit beidseitig leerlaufenden linearen Resonatoren Expired EP0071509B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8114426A FR2510326A1 (fr) 1981-07-24 1981-07-24 Filtre passe-bande a resonateurs lineaires ouverts a leurs deux extremites
FR8114426 1981-07-24

Publications (2)

Publication Number Publication Date
EP0071509A1 true EP0071509A1 (de) 1983-02-09
EP0071509B1 EP0071509B1 (de) 1986-08-20

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Family Applications (1)

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EP82401308A Expired EP0071509B1 (de) 1981-07-24 1982-07-09 Bandpassfilter mit beidseitig leerlaufenden linearen Resonatoren

Country Status (5)

Country Link
US (1) US4455540A (de)
EP (1) EP0071509B1 (de)
JP (1) JPS5819502U (de)
DE (1) DE3272721D1 (de)
FR (1) FR2510326A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164804A (en) * 1984-09-17 1986-03-26 Stc Plc Stripline filters for transmission systems
FR2578104A1 (fr) * 1985-02-27 1986-08-29 Alcatel Thomson Faisceaux Filtre passe-bande pour hyperfrequences
FR2613538A1 (fr) * 1987-03-31 1988-10-07 Thomson Csf Filtre hyperfrequence
WO1990004861A1 (de) * 1988-10-18 1990-05-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Hochfrequenz-bandpassfilter
GB2246670A (en) * 1990-08-03 1992-02-05 Mohammad Reza Moazzam Microstrip filter
WO2007037083A1 (en) * 2005-09-29 2007-04-05 Kabushiki Kaisha Toshiba Filter and radio communication device using the same

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2540294B1 (fr) * 1983-01-31 1985-10-04 Thomson Csf Filtre hyperfrequence a resonateurs lineaires
US4677693A (en) * 1985-01-25 1987-06-30 Alps Electric Co., Ltd. Frequency conversion circuit
US4714905A (en) * 1986-10-08 1987-12-22 K & L Microwave SMC filter and method of manufacture thereof
US4881050A (en) * 1988-08-04 1989-11-14 Avantek, Inc. Thin-film microwave filter
WO1998000880A1 (en) * 1996-06-28 1998-01-08 Superconducting Core Technologies, Inc. Planar radio frequency filter
US5770987A (en) * 1996-09-06 1998-06-23 Henderson; Bert C. Coplanar waVeguide strip band pass filter
GB2333905A (en) * 1998-01-29 1999-08-04 Roke Manor Research Filter for electrical signals
JP3633280B2 (ja) * 1998-05-29 2005-03-30 松下電器産業株式会社 半波長共振器型高周波フィルタ
ES2143964B1 (es) * 1998-09-15 2000-12-01 Univ Catalunya Politecnica Diplexor dual para telefonia celular gsm y dcs.
CN1180509C (zh) * 2002-12-20 2004-12-15 清华大学 微波单折叠滤波器
US7145418B2 (en) * 2004-12-15 2006-12-05 Raytheon Company Bandpass filter
JP5094524B2 (ja) * 2008-04-17 2012-12-12 三菱電機株式会社 高周波結合線路および高周波フィルタ
US9843082B2 (en) * 2013-07-22 2017-12-12 City University Of Hong Kong Microstrip line filter
RU176221U1 (ru) * 2017-09-25 2018-01-12 Российская Федерация, от имени которой выступает Министерство обороны Российской Федерации Компактный полоснопропускающий фильтр свч
RU2710386C2 (ru) * 2018-06-18 2019-12-26 Федеральное государственное автономное образовательное учреждение высшего образования "Сибирский федеральный университет" Миниатюрный полосковый полосно-пропускающий фильтр

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945195A (en) * 1958-03-25 1960-07-12 Thompson Ramo Wooldridge Inc Microwave filter

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US2196272A (en) * 1934-07-25 1940-04-09 Rca Corp Transmission network
US2248751A (en) * 1939-02-10 1941-07-08 Fed Telegraph Co Transmission modifying network
US3754198A (en) * 1972-03-20 1973-08-21 Itt Microstrip filter
US3745489A (en) * 1972-05-01 1973-07-10 Stanford Research Inst Microwave and uhf filters using discrete hairpin resonators
SE7412382L (sv) * 1974-10-02 1976-04-05 Larssons Hardmetall Ab Gresverktyg med skerlas
FR2460049A1 (fr) * 1979-06-25 1981-01-16 Labo Electronique Physique Filtre coupe-bande pour ligne de transmission hyperfrequence et circuit de polarisation de transistor hyperfrequence comprenant ce filtre
FR2510325B1 (fr) * 1981-07-24 1987-09-04 Thomson Csf Filtre hyperfrequence de petites dimensions, a resonateurs lineaires

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945195A (en) * 1958-03-25 1960-07-12 Thompson Ramo Wooldridge Inc Microwave filter

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ARCHIV FÜR ELEKTRONIK UND ÜBERTRAGUNGSTECHNIK, vol.29, no.11, novembre 1975, Stuttgart (DE) *
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol.MTT-22, no.12, décembre 1974, New York (US) *
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol.MTT-22, no.5, mai 1974, New York (US) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164804A (en) * 1984-09-17 1986-03-26 Stc Plc Stripline filters for transmission systems
GB2164804B (en) * 1984-09-17 1989-03-15 Stc Plc Filters for transmission systems
FR2578104A1 (fr) * 1985-02-27 1986-08-29 Alcatel Thomson Faisceaux Filtre passe-bande pour hyperfrequences
EP0193162A1 (de) * 1985-02-27 1986-09-03 Alcatel Transmission Par Faisceaux Hertziens A.T.F.H. Mikrowellenbandpassfilter
US4731596A (en) * 1985-02-27 1988-03-15 Alcatel Thomson Faisceaux Hertziens Band-pass filter for hyperfrequencies
FR2613538A1 (fr) * 1987-03-31 1988-10-07 Thomson Csf Filtre hyperfrequence
WO1990004861A1 (de) * 1988-10-18 1990-05-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Hochfrequenz-bandpassfilter
US5136269A (en) * 1988-10-18 1992-08-04 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. High-frequency band-pass filter having multiple resonators for providing high pass-band attenuation
GB2246670A (en) * 1990-08-03 1992-02-05 Mohammad Reza Moazzam Microstrip filter
GB2246670B (en) * 1990-08-03 1995-04-12 Mohammad Reza Moazzam Microstrip coupled lines filters with improved performance
WO2007037083A1 (en) * 2005-09-29 2007-04-05 Kabushiki Kaisha Toshiba Filter and radio communication device using the same
US7397330B2 (en) 2005-09-29 2008-07-08 Kabushiki Kaisha Toshiba Filter and radio communication device using the same

Also Published As

Publication number Publication date
JPS5819502U (ja) 1983-02-07
DE3272721D1 (en) 1986-09-25
FR2510326B1 (de) 1984-04-06
US4455540A (en) 1984-06-19
JPS6327443Y2 (de) 1988-07-25
FR2510326A1 (fr) 1983-01-28
EP0071509B1 (de) 1986-08-20

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