EP0071509B1 - Bandpassfilter mit beidseitig leerlaufenden linearen Resonatoren - Google Patents

Bandpassfilter mit beidseitig leerlaufenden linearen Resonatoren Download PDF

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Publication number
EP0071509B1
EP0071509B1 EP82401308A EP82401308A EP0071509B1 EP 0071509 B1 EP0071509 B1 EP 0071509B1 EP 82401308 A EP82401308 A EP 82401308A EP 82401308 A EP82401308 A EP 82401308A EP 0071509 B1 EP0071509 B1 EP 0071509B1
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EP
European Patent Office
Prior art keywords
resonators
filter
resonator
band
frequency
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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.)
Expired
Application number
EP82401308A
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English (en)
French (fr)
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EP0071509A1 (de
Inventor
Marie-Christine Henriot
Patrick Janer
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Thales SA
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Thomson CSF SA
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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 English literature) thus called U resonators, and such that straight resonators, formed by a straight section of line. It is recalled on this subject that these resonators, also called ⁇ / 2 resonators, 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.
  • the object of the present invention is to avoid having to use two filters.
  • Document DE-C-2 543 605 shows that it is known to place, either at the input or at the output of a microwave circuit, a quarter-wave line to ground operating as a rejector of a particular frequency .
  • a bandpass filter is provided with n linear resonators open at the two ends, called resonators in ⁇ / 2 (n: positive integer; ⁇ : mean wavelength of the passband in the filter), characterized in that, to each of p (p integer at least equal to 2 and at most equal to n) resonators in ⁇ / 2 is connected, in the vicinity of its middle, that is to say where the field electric has its minimum value, an additional resonator, all of these additional p resonators making a notch filter.
  • FIG. 1 is a schematic view of a bandpass filter produced using U-shaped resonators.
  • This filter comprises two access lines A 1 A 2 , mutually parallel and, between these two lines, four resonators in U, H 1 to H 4 , whose vertical bars of the U are parallel to the lines A, 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 1 and A 2 and the resonators such as H 1 to H 4 and P 1 , P 4 are formed by metal deposits arranged 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 P 4 bring practically no modification of the characteristics of the bandpass filter obtained thanks to the H resonators 1 to 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 Ci and P ' 4 C 4 an electrical length equal to half the length d 'wave ⁇ ' which was discussed on the occasion of Figure 1 ( ⁇ '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 1 and P 4 of the U type by two simple resonators Q 1 and Q 4 , that is to say 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 consist of line pieces of length ⁇ '/ 4 where ⁇ ' is the wavelength in the filter corresponding to the frequency to be rejected.
  • FIGS. 5 and 6 A concrete example of embodiment of such a filter is given with the aid of FIGS. 5 and 6.
  • 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 1 and an output line A 2 parallel to each other and between these lines four straight resonators, L 1 to L 4 , of length equal to X / 2 ( ⁇ wavelength corresponding to the average frequency of the filter bandwidth), open at both ends.
  • Four simple resonators Q 1 to 0 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 straight resonators L 1 to L 4 .
  • the added resonators (Q 1 to Q 4 ) bring a notch function at the frequency corresponding to the wavelength X ′. 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 of 0 to 1 cm 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 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 o in broken lines).
  • the curve G o shows that the conventional filter (without the resonators Q 1 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 1 and Q 6 to the other elements of the filter of 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 1 and P 4 can be associated with the resonators H 2 and H 3 .
  • fixed capacitors can be mounted obtained at the same time and in the same way as the resonators, that is to say by metallic deposition on a wafer or from a metallized wafer from which part of the metal 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 ' 1 and P' 4 , perpendicular to these branches, two successive tongues being respectively integral with the two branches of the U.
  • the center frequency of the The notch function which is integrated into a bandpass filter can be just as much a frequency higher than the passband of the bandpass filter, as a lower frequency, or even even a frequency included in this passband: 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 2 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)

Claims (3)

1. Bandpassfilter mit n linearen und an beiden Enden leerlaufenden Resonatoren (H1 bis H4), X/2-Resonatoren genannt (n ist eine positive ganze Zahl und λ die mittlere Wellenlänge des Durchlaßbands des Filters), dadurch gekennzeichnet, daß an jeden von p der λ/2-Resonatoren (H1, H4) (p ist eine ganze Zahl mindestens gleich 2 und höchstens gleich n) in der Nähe der Mitte des jeweiligen Resonators, d. h. dort, wo das elektrische Feld seinen geringsten Wert hat, ein Nebenresonator (P1, P4) angeschlossen, wobei die Gesamtheit dieser Nebenresonatoren ein Bandsperrfilter bildet.
2. Filter nach Anspruch 1, dadurch gekennzeichnet, daß mindestens einer der p Nebenresonatoren (P1, P4) ein U-förmiger Resonator ist und daß dieser Nebenresonator an den λ/2-Resonator über den waagerechten Balken seines U angeschlossen ist.
3. Filter nach Anspruch 1, dadurch gekennzeichnet, daß mindestens einer der p Nebenresonatoren ein Resonator (Q1, Q4) ist, dessen eines Ende isoliert ist und dessen anderes Ende an den entsprechenden X/2-Resonator angeschlossen ist.
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 EP0071509A1 (de) 1983-02-09
EP0071509B1 true 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)

Families Citing this family (21)

* 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
GB2164804B (en) * 1984-09-17 1989-03-15 Stc Plc Filters for transmission systems
US4677693A (en) * 1985-01-25 1987-06-30 Alps Electric Co., Ltd. Frequency conversion circuit
FR2578104B1 (fr) * 1985-02-27 1987-03-20 Alcatel Thomson Faisceaux Filtre passe-bande pour hyperfrequences
US4714905A (en) * 1986-10-08 1987-12-22 K & L Microwave SMC filter and method of manufacture thereof
FR2613538A1 (fr) * 1987-03-31 1988-10-07 Thomson Csf Filtre hyperfrequence
US4881050A (en) * 1988-08-04 1989-11-14 Avantek, Inc. Thin-film microwave filter
DE3835480A1 (de) * 1988-10-18 1990-04-19 Fraunhofer Ges Forschung Hochfrequenz-bandpassfilter
GB2246670B (en) * 1990-08-03 1995-04-12 Mohammad Reza Moazzam Microstrip coupled lines filters with improved performance
US6122533A (en) * 1996-06-28 2000-09-19 Spectral Solutions, Inc. Superconductive planar radio frequency filter having resonators with folded legs
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
JP4171015B2 (ja) 2005-09-29 2008-10-22 株式会社東芝 フィルタ及びこれを用いた無線通信装置
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 (2)

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Publication number Priority date Publication date Assignee Title
DE2543605C3 (de) * 1974-10-02 1979-04-05 E.G. Larssons Haardmetall Ab, Norrkoeping (Schweden) Umlaufendes Schneidwerkzeug zur Bearbeitung von Holz, Holzwerkstoffen oder Kunststoffen
EP0071508A1 (de) * 1981-07-24 1983-02-09 Thomson-Csf Kleindimensionierter Mikrowellenfilter mit linearen Resonatoren

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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

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
DE2543605C3 (de) * 1974-10-02 1979-04-05 E.G. Larssons Haardmetall Ab, Norrkoeping (Schweden) Umlaufendes Schneidwerkzeug zur Bearbeitung von Holz, Holzwerkstoffen oder Kunststoffen
EP0071508A1 (de) * 1981-07-24 1983-02-09 Thomson-Csf Kleindimensionierter Mikrowellenfilter mit linearen Resonatoren

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ARCHIV FÜR ELEKTRONIK UND ÜBERTRAGUNGSTECHNIK, vol.29, no.11, novembre 1975, Stuttgart (DE), V. TULAJA: "Meander line filters with shunt stubs at the inside of the meander loops", pages 461-464 *
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol.MTT-22, no.12, décembre 1974, New York (US), P.A. DUPUIS et al.: "Folded-line and hybrid folded-line bandstop filters", pages 1312-1316 *
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol.MTT-22, no.5, mai 1974, New York (US), E.G. CRISTAL et al.: "A compact channeldropping filter for stripline and microwave integrated circuits", pages 499 à 504 *

Also Published As

Publication number Publication date
FR2510326B1 (de) 1984-04-06
US4455540A (en) 1984-06-19
DE3272721D1 (en) 1986-09-25
JPS5819502U (ja) 1983-02-07
FR2510326A1 (fr) 1983-01-28
JPS6327443Y2 (de) 1988-07-25
EP0071509A1 (de) 1983-02-09

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