EP0255068B1 - Filtre pour ondes électromagnétiques courtes ayant la configuration d'un filtre en peigne ou d'un filtre interdigital - Google Patents

Filtre pour ondes électromagnétiques courtes ayant la configuration d'un filtre en peigne ou d'un filtre interdigital Download PDF

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Publication number
EP0255068B1
EP0255068B1 EP87110779A EP87110779A EP0255068B1 EP 0255068 B1 EP0255068 B1 EP 0255068B1 EP 87110779 A EP87110779 A EP 87110779A EP 87110779 A EP87110779 A EP 87110779A EP 0255068 B1 EP0255068 B1 EP 0255068B1
Authority
EP
European Patent Office
Prior art keywords
resonators
spr1
spiral
filter
filters
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.)
Expired - Lifetime
Application number
EP87110779A
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German (de)
English (en)
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EP0255068A1 (fr
Inventor
Heinz Ing. Grad. Krause
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Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT87110779T priority Critical patent/ATE84639T1/de
Publication of EP0255068A1 publication Critical patent/EP0255068A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/005—Helical resonators; Spiral resonators
    • 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 invention relates to a comb line or interdigital line filter according to the preamble of claim 1.
  • Document D1 (USA 3 836 881) discloses a filter for short electromagnetic waves designed in the manner of comb line or interdigital line filters, in which the resonators are arranged in such a way that their coupling acts as a line coupling, in which the inner conductors of the resonators act as helical resonators are formed (see column 1, lines 8-19, and also Fig. 1).
  • D1 The difference between D1 and the subject matter of claim 1 is that the resonators used in D1 are not plane spirals.
  • the function of a helix resonator and a resonator with a plane spiral is described in D2 ("Review of the Electrical Communication Laboratories, Volume 24, No. 9-10, September-October 1976, pages 776-786; I. Nishi et al .: "Spiral Resonator for PCM-400 M system").
  • Helix filters also require a relatively large production outlay and many individual parts.
  • the filters with air dielectric built with metal rods are voluminous, those with ceramic dielectric are relatively heavy, which is particularly undesirable in portable devices.
  • the invention has for its object to provide implementation options of filters in the manner of comb line or interdigital line filters which have high-quality electrical properties and which can be produced as inexpensively as possible in a small size.
  • FIG. 1 the state of the art is shown again for quick understanding, as is given, for example, in the above-mentioned literature reference "Fujitsu Scientific Technical Journal, Vol. 4, No. 3, pages 29 to 52".
  • a comb line filter is shown, with the so-called Interdigital filters are known to have the same effect.
  • the inner conductors are arranged in the manner of a comb and open out on the same housing surface, while in the interdigital filter the inner conductors alternately open out on opposite housing surfaces.
  • Fig. 1a and Fig. 1b four resonators R1 to R4 are provided. They have approximately the length ⁇ / 4.
  • the resonators R1 to R4 are arranged in the housing G and on their faces the capacitances CV1 to CV an can be seen, which can either actually be switched or which also symbolically represent the stray capacitances of the inner conductors R1 to R4.
  • the resonators R1 to R4 have the diameter d.
  • At the first resonator R1 opens an input line E, which is usually designed as a coaxial line.
  • the inner conductor of this coaxial line is firmly connected to the resonator R 1, the outer conductor is firmly connected to the housing G.
  • the output line A can be seen on the resonator R4, the inner conductor of which is connected to the resonator R4, while the outer conductor is also connected to the housing G.
  • the reference numerals K1, K2 and K3 that the coupling between the resonators acts as a line coupling, as is the case with interdigital filters.
  • this type of filter implementation has the disadvantage that it takes up a relatively large amount of space and may also be relatively difficult.
  • spiral resonators SpR1 to SpR4 are now used, which are designed as flat, flat spirals and which are also housed in the housing G. Between these spirals there is a line coupling K1 K2 and K3. The input line E and the output line A can also be seen.
  • the elevation of Fig. 2b shows that there Tuning screws A1 to A4 are provided, which in the special embodiment are perpendicular to the planes of the spirals and their longitudinal axis goes approximately through the center of the spirals.
  • Input E and output A are shown as tapped coils in order to symbolically represent the transformer effect of the tapping.
  • planar spiral resonators however, is that the entire resonator set of a filter can be manufactured precisely and inexpensively using punching, form-etching or casting technology, as well as on laminated circuit boards, which is basically not possible, for example, with filters with helical resonators.
  • All design methods for line filters e.g. Fujitsu Scientific Technical Journal, Vol. 4 No. 3, pp. 29 to 52
  • the coupling distance K1-K3 between the spirals depends on the chosen spiral shape and the winding sense and experimental must be determined.
  • a slight shortening of the spiral length compared to an extended resonator is also necessary because of the additional capacitance C w occurring between the spiral windings.
  • FIG. 2 shows a undistributed filter between input E and output A with an etched or punched or spark-eroded compact resonator set SpR1-SpR4, installed in a housing G and surrounded by a dielectric D1, which is here, for example, air. Frequency tuning is possible with the screws A1-A4.
  • FIG. 3 shows the simplified equivalent circuit with four resonant circuits.
  • 4a, 4b and 5 show further advantageous embodiments.
  • parts having the same effect are also designated with the same reference notes as in the previous figures, so that there is no longer any need to go into them in detail.
  • 4a, 4b and 5 are shown in elevation, in side view and in Fig. 4a also the top view spiral resonator filter with a coupling Ü1 or Ü2.
  • the associated electrical equivalent circuit diagram is drawn in FIG. 6.
  • the overcoupling U1 leads from the input E to a connection point S1
  • the overcoupling Ü2 which is shown as an example and which is not realized in the exemplary embodiment - leads from a connection point S2 to the output A.
  • overcoupling Ü2 does not lead directly to output A
  • such measures can produce damping poles in the filter characteristic.
  • two sets of resonators SpR1 to SpR4 are connected in parallel.
  • the two sets of resonators have the same geometry and the parallel connection of the individual conductor parts reduces the losses and thus increases the quality of the resonators.
  • the individual resonators are again labeled 1 to 4, the associated inductors with L1 to L4 and the associated capacitances C1 to C4.
  • the coupling-in capacitance is denoted by C K1 and the coupling-out capacitance by C K2 .
  • C K1 The coupling-in capacitance
  • C K2 the coupling-out capacitance
  • inductors in the longitudinal branch of the circuit which are also identified by L K1 and L K2 .
  • a capacitive overcoupling C ü which is connected from the input to the resonant circuit 2, illustrates the effect of the overcoupling Ü1.
  • the complete set of resonators to avoid mechanical vibrations was additionally installed in the housing G on a low-loss, for example, Teflon carrier plate T.
  • Teflon carrier plate T In the support plate T are also holes for the tuning elements A1 to A4 and the coupling bases S1 and S2 incorporated.
  • the resonator set was implemented as an example on a double-laminated, low-loss printed circuit board L.
  • this solution is expected to have a lower quality than that of a pure air dielectric.
  • the equivalent circuit diagram for the implementations according to FIGS. 4 and 5 is shown in FIG. 6. You can see some other advantageous details. From the characteristic function belonging to FIG. 6 you can see a finite pole, which is realized by the coupling C ü (Fig. 6) or Ü1.
  • the conductor length of the spiral including the effect of a shortening factor is ⁇ / 4.
  • the corresponding frequency is related to the center of the pass band.
  • the characteristic impedance Z is expediently chosen to be 50 ... 150. With a rectangular cross section of the conductor, Z is known to depend on the conductor width and thickness and on its distance from the metal housing and can be calculated using known methods such as in the strip-line technique.
  • the resonator qualities depend essentially on the nature and conductivity of the surface and the filter volume.
  • Two resonator arrangements of the same geometry (according to FIG. 5) which are constructed approximately at a distance from the conductor width bring about quality improvements of up to 30%.
  • the geometry of the resonators need not be limited to spirals with a continuous course. If necessary, the resonators can also be realized in a rectangular shape as shown in FIG. 7 or with a different line cross section - adapted to the current occupancy of the resonator. Likewise, a 90 ° rotation of the spirals SpR1 to SpR5, as shown in Fig. 8 or Fig. 9, is possible.
  • the spiral center points M as in FIGS. 9 and 10 can also be selected as the common base point of the spirals.
  • a carrier plate 6 is used for receiving the ground connections M and the resonators SpR1 to SpR4.
  • FIG. 11 shows the measured course of the operating attenuation a B and the reflection attenuation a r as a function of the frequency f of a filter according to FIG. 4 implemented at 900 MHz.
  • the pass band lies approximately between 935 MHz and 970 MHz.
  • a damping pole of the operating damping a b occurs, so that it can be seen that the operating damping curve can be increased at any time.
  • the filters described above especially in the frequency range of traffic radio, require a relatively small volume with good electrical properties.
  • the resonators designed as spiral resonators have a shortening of the electrical ones Overall length, which is particularly advantageous in mobile systems.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Claims (8)

  1. Filtre agencé selon la technique des filtres de ligne en peigne ou des filtres de ligne interdigitées pour des ondes électromagnétiques courtes et dans lequel les résonateurs sont disposés de telle sorte que leur couplage agit à la manière d'un couplage de ligne (K₁...K₃),
    et dans lequel il est prévu un couplage (E) et un découplage (A) et dans lequel le conducteur intérieur des résonateurs (R₁...R₄) est agencé sous la forme de spirales planes (SpR₁...SpR₄) et dans lequel il est prévu des éléments de réglage d'accord (A₁...A₄), qui pénètrent dans l'espace du champ des résonateurs en spirale (SpR₁...SpR₄),
    caractérisé par le fait
    que le couplage (E) ou le découplage (A) est agencé de telle sorte qu'au moins un résonateur (SpR₁) est shunté.
  2. Filtre suivant la revendication 1, caractérisé par le fait que deux résonateurs (SpR₁...SpR₄) possédant une même géométrie sont branchés en parallèle.
  3. Filtre suivant la revendication 1 ou 2, caractérisé par le fait que les éléments de réglage d'accord (A₁...A₄) sont agencés sous la forme de vis de réglage d'accord, dont l'axe longitudinal est perpendiculaire au plan des résonateurs spiraux (SpR₁...SpR₄) et traverse la spirale approximativement en son centre.
  4. Filtre suivant la revendication 1 ou 2, caractérisé par le fait que la forme de la spirale (SpR₁) diffère de la forme continue.
  5. Filtre suivant la revendication 1 ou 2, caractérisé par le fait que la spirale (SpR₁) a un tracé rectangulaire.
  6. Filtre suivant la revendication 1 ou 2, caractérisé par le fait que la section transversale du conducteur de la spirale (SpR₁) varie continûment ou de façon brusque.
  7. Filtre suivant la revendication 1 ou 2, caractérisé par le fait que les résonateurs en spirale (SpR₁... SpR₄) sont disposés de telle sorte que les plans formés par les spirales sont confondus.
  8. Filtre suivant la revendication 1 ou 2, caractérisé par le fait que les résonateurs en spirale (SpR₁... SpR₄) sont disposés de telle sorte que les plans formés par les spirales sont parallèles entre eux.
EP87110779A 1986-07-29 1987-07-24 Filtre pour ondes électromagnétiques courtes ayant la configuration d'un filtre en peigne ou d'un filtre interdigital Expired - Lifetime EP0255068B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87110779T ATE84639T1 (de) 1986-07-29 1987-07-24 In der art vom kammleitungs- bzw. interdigitalleitungsfiltern ausgebildetes filter fuer kurze elektromagnetische wellen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3625559 1986-07-29
DE3625559 1986-07-29

Publications (2)

Publication Number Publication Date
EP0255068A1 EP0255068A1 (fr) 1988-02-03
EP0255068B1 true EP0255068B1 (fr) 1993-01-13

Family

ID=6306176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110779A Expired - Lifetime EP0255068B1 (fr) 1986-07-29 1987-07-24 Filtre pour ondes électromagnétiques courtes ayant la configuration d'un filtre en peigne ou d'un filtre interdigital

Country Status (5)

Country Link
US (1) US4757285A (fr)
EP (1) EP0255068B1 (fr)
JP (1) JPS6338305A (fr)
AT (1) ATE84639T1 (fr)
DE (1) DE3783530D1 (fr)

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Publication number Priority date Publication date Assignee Title
US4988963A (en) * 1989-02-23 1991-01-29 Dx Antenna Company, Limited High frequency coaxial line coupling device
JPH04801A (ja) * 1990-04-17 1992-01-06 Murata Mfg Co Ltd バンドパスフィルタ
US5420553A (en) * 1991-01-16 1995-05-30 Murata Manufacturing Co., Ltd. Noise filter
CA2073272C (fr) * 1991-07-08 1997-04-01 Kenjiro Higaki Resonateur hyperfrequence fait d'un materiau composite oxyde-supraconducteur
JP3120682B2 (ja) * 1995-01-09 2000-12-25 株式会社村田製作所 チップ型フィルタ
JP2897678B2 (ja) * 1995-03-22 1999-05-31 株式会社村田製作所 誘電体共振器及び高周波帯域通過フィルタ装置
US5945894A (en) * 1995-03-22 1999-08-31 Murata Manufacturing Co., Ltd. Dielectric resonator and filter utilizing a non-radiative dielectric waveguide device
US5838213A (en) * 1996-09-16 1998-11-17 Illinois Superconductor Corporation Electromagnetic filter having side-coupled resonators each located in a plane
JP3402252B2 (ja) * 1998-12-22 2003-05-06 株式会社村田製作所 共振器、フィルタ、デュプレクサおよび通信装置
US6522217B1 (en) * 1999-12-01 2003-02-18 E. I. Du Pont De Nemours And Company Tunable high temperature superconducting filter
JP3452006B2 (ja) * 1999-12-07 2003-09-29 株式会社村田製作所 フィルタ、デュプレクサおよび通信装置
JP3452032B2 (ja) * 2000-06-26 2003-09-29 株式会社村田製作所 フィルタ、デュプレクサおよび通信装置
JP3603826B2 (ja) * 2001-09-17 2004-12-22 株式会社村田製作所 スパイラル線路集合体素子、共振器、フィルタ、デュプレクサおよび高周波回路装置
US7084720B2 (en) * 2002-01-09 2006-08-01 Broadcom Corporation Printed bandpass filter for a double conversion tuner
GB0202839D0 (en) * 2002-02-07 2002-03-27 Johnson Electric Sa Blower motor
US7714688B2 (en) * 2005-01-20 2010-05-11 Avx Corporation High Q planar inductors and IPD applications
JP5120945B2 (ja) * 2008-05-16 2013-01-16 Ｄｘアンテナ株式会社 バラン装置およびアンテナ装置
WO2010082384A1 (fr) * 2009-01-15 2010-07-22 株式会社村田製作所 Filtre de ligne ruban
KR101295869B1 (ko) * 2009-12-21 2013-08-12 한국전자통신연구원 복수의 절연층들에 형성된 선로 필터
CN103311621A (zh) * 2012-03-15 2013-09-18 成都赛纳赛德科技有限公司 一种基于细线支节的带线高通滤波器
CN103311609A (zh) * 2012-03-15 2013-09-18 成都赛纳赛德科技有限公司 一种基于螺旋支节的带线高通滤波器
WO2020147063A1 (fr) * 2019-01-17 2020-07-23 罗森伯格技术（昆山）有限公司 Filtre
CN112038740A (zh) * 2020-08-10 2020-12-04 广州智讯通信系统有限公司 一种小型化多工器

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JPH0716124B2 (ja) * 1983-08-02 1995-02-22 松下電器産業株式会社 同調装置

Also Published As

Publication number Publication date
EP0255068A1 (fr) 1988-02-03
JPH056921B2 (fr) 1993-01-27
US4757285A (en) 1988-07-12
DE3783530D1 (de) 1993-02-25
JPS6338305A (ja) 1988-02-18
ATE84639T1 (de) 1993-01-15

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