EP0226951A1 - Filtre coupe-bande avec des éléments de ligne pour des ondes électromagnétiques courtes - Google Patents

Filtre coupe-bande avec des éléments de ligne pour des ondes électromagnétiques courtes Download PDF

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Publication number
EP0226951A1
EP0226951A1 EP86117196A EP86117196A EP0226951A1 EP 0226951 A1 EP0226951 A1 EP 0226951A1 EP 86117196 A EP86117196 A EP 86117196A EP 86117196 A EP86117196 A EP 86117196A EP 0226951 A1 EP0226951 A1 EP 0226951A1
Authority
EP
European Patent Office
Prior art keywords
line
coupling
input
electromagnetic waves
line elements
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
EP86117196A
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German (de)
English (en)
Other versions
EP0226951B1 (fr
Inventor
Wolfgang Dipl.-Ing. Langer
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT86117196T priority Critical patent/ATE55847T1/de
Publication of EP0226951A1 publication Critical patent/EP0226951A1/fr
Application granted granted Critical
Publication of EP0226951B1 publication Critical patent/EP0226951B1/fr
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
    • H01P1/207—Hollow waveguide filters
    • H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide

Definitions

  • the invention relates to a band stopper according to the preamble of the claim.
  • Band locks of the aforementioned type are known in principle from US Pat. No. 4,449,108.
  • the lengths of the coupling line sections are chosen to deviate from the value ⁇ / 4 in order to improve the barrier damping of the band stopper with this measure.
  • at least three blocking circuits are required and the band stop is designed so that a blocking circuit is present at the input and the output.
  • the blocking circuits can also be constructed from concentrated switching elements, then a number of synthetic methods, in particular for broadband barriers, result in line pieces with different wave resistances for the coupling lines. This leads to a complicated implementation because stepped transmission lines have to be used. The jumps make it more difficult to manufacture and control the interference reactions.
  • the invention is based on the object of specifying possible implementations of bandstops from line elements, in which wave resistance jumps are no longer necessary in the coupling line sections. It is thereby achieved to optimize the echo attenuation.
  • Fig. 1 the general electrical equivalent circuit of a bandstop from line elements is shown.
  • the individual line elements lie between the terminating resistors Z A on the input and output sides.
  • the input-side resistance Z A is therefore followed by a line of length lK1 with the wave resistance ZK1.
  • a line element for example in the form of a resonator, with the line length IS1 and the characteristic impedance ZS1 is connected in parallel.
  • further coupling lines then follow in the chain, as is also indicated by the dashed lines.
  • the last reactance element is identified by a short-circuited line of length lSn and wave impedance ZSn, which in turn is followed by the last coupling line section with length lK, n + 1. This is followed by the terminating resistor Z A.
  • Such circuits can be calculated, for example, according to the book by Matthaei, Young, Jonas "Design of Microwaves Filters Impedance-Matching Networks and Coupling Structures" (McGraw-Hill, New York 1964), with particular reference to pages 733 to 737 and pages 757 to 759.
  • An approximate calculation with a narrow blocking range and an exact calculation for filters with a wide and narrow blocking range are shown there in detail.
  • Table A shows the following in columns I, II and III.
  • the corresponding values can be seen in column III if only wave resistance jumps (Zk jumps) are made when the bandstop is implemented.
  • the invention now solves the technical problem in such a way that a wave resistance jump occurs only at the input and output of an at least two-circuit bandstop and the lengths of the coupling and coupling line sections deviate considerably from the value ⁇ / 4. Lines of length ⁇ / 2 can also be connected in a known manner.
  • the analysis curves in FIGS. 2a and 2b show the gain in echo attenuation and the change in the blocking attenuation with a four-circuit bandstop.
  • the dashed curves I and II show the course according to the classic filter design, the dotted curve III shows the course if only Zk jumps are made and the solid curve IV shows if only a Zk jump is made, the line length Lk is graded.
  • FIGS. 3a, 3b and 3c A four-circuit embodiment using line elements is shown in FIGS. 3a, 3b and 3c.
  • the individual lengths of the coupling lines lK1, lK2, lK3, lK2 and finally lK1 can again be seen.
  • the blocking circles are denoted as IS in Table A.
  • section AB or section EF the structural design of the band stop can also be seen.
  • a surge in the impedance is no longer necessary in the coupling lines, while the lines only become wider at input 1 and output 2 and the impedance changes there.
  • the cable lengths lK deviate considerably from the value ⁇ / 4, as can be seen in column IV of table A.
  • the band lock described has the advantage that a sufficiently large manufacturing accuracy can also be achieved with a relatively space-saving and simple production.
EP86117196A 1985-12-13 1986-12-10 Filtre coupe-bande avec des éléments de ligne pour des ondes électromagnétiques courtes Expired - Lifetime EP0226951B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117196T ATE55847T1 (de) 1985-12-13 1986-12-10 Bandsperre fuer kurze elektromagnetische wellen mit leitungselementen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3544171 1985-12-13
DE3544171 1985-12-13

Publications (2)

Publication Number Publication Date
EP0226951A1 true EP0226951A1 (fr) 1987-07-01
EP0226951B1 EP0226951B1 (fr) 1990-08-22

Family

ID=6288399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117196A Expired - Lifetime EP0226951B1 (fr) 1985-12-13 1986-12-10 Filtre coupe-bande avec des éléments de ligne pour des ondes électromagnétiques courtes

Country Status (3)

Country Link
EP (1) EP0226951B1 (fr)
AT (1) ATE55847T1 (fr)
DE (1) DE3673622D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2665576A1 (fr) * 1990-07-31 1992-02-07 Alcatel Telspace Filtre hyperfrequence.
US5256990A (en) * 1992-05-08 1993-10-26 Skydata, Inc. Compact, die-cast precision bandstop filter structure
US5407904A (en) * 1993-08-13 1995-04-18 Das; Satyendranath High Tc superconducting high power filters
WO2001017057A1 (fr) * 1999-08-31 2001-03-08 Cryoelectra Gmbh Systeme de filtre passe-bande haute frequence a poles d'attenuation

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3579153A (en) * 1967-09-07 1971-05-18 Bell Telephone Labor Inc Microwave filter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3579153A (en) * 1967-09-07 1971-05-18 Bell Telephone Labor Inc Microwave filter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2665576A1 (fr) * 1990-07-31 1992-02-07 Alcatel Telspace Filtre hyperfrequence.
US5256990A (en) * 1992-05-08 1993-10-26 Skydata, Inc. Compact, die-cast precision bandstop filter structure
US5407904A (en) * 1993-08-13 1995-04-18 Das; Satyendranath High Tc superconducting high power filters
WO2001017057A1 (fr) * 1999-08-31 2001-03-08 Cryoelectra Gmbh Systeme de filtre passe-bande haute frequence a poles d'attenuation

Also Published As

Publication number Publication date
ATE55847T1 (de) 1990-09-15
EP0226951B1 (fr) 1990-08-22
DE3673622D1 (de) 1990-09-27

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