EP0064458A1 - Bandpassfilter, ausgeführt in Rechteckhohlleitertechnik, mit hoher Selektivität - Google Patents

Bandpassfilter, ausgeführt in Rechteckhohlleitertechnik, mit hoher Selektivität Download PDF

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Publication number
EP0064458A1
EP0064458A1 EP82400757A EP82400757A EP0064458A1 EP 0064458 A1 EP0064458 A1 EP 0064458A1 EP 82400757 A EP82400757 A EP 82400757A EP 82400757 A EP82400757 A EP 82400757A EP 0064458 A1 EP0064458 A1 EP 0064458A1
Authority
EP
European Patent Office
Prior art keywords
cavities
filter
guide
band
notch
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.)
Withdrawn
Application number
EP82400757A
Other languages
English (en)
French (fr)
Inventor
Yves Le Nohaic
Marc Sauvage
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0064458A1 publication Critical patent/EP0064458A1/de
Withdrawn legal-status Critical Current

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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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • 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 present invention relates to band pass filters in rectangular guide, having a high frequency selectivity.
  • the present invention aims to avoid the drawbacks of the prior art without increasing the cost price of the filter.
  • a band pass filter in rectangular guide, with high frequency selectivity comprising a rectangular guide which will said main guide and shunt susceptances placed inside the main guide so as to delimit there n (n integer greater than 0) successive main cavities, is characterized in that it comprises m (m integer greater than 0 and less or equal to n) notch cavities respectively coupled to m of the n main cavities and whose notch effect occurs at the limit of the passband of the bandpass filter.
  • FIG. 1 is a cross-sectional view of a filter according to the invention.
  • This figure shows a rectangular waveguide 1 with its two connection flanges 10, 11.
  • the interior of this guide is divided into four cavities 2, 3, 4, 5, using shunt susceptances formed by rods such that T 1 , T 2 9 T 3 9 T 4 , T 5 ; these rods are arranged in pairs so as to delimit cavities with a length slightly less than where g is the wavelength guided in the guide corresponding to an average operating frequency of 8.1 GHz.
  • Screws with locking nuts 12, 13, 14, 15, 16 are associated with the rods to allow adjustment of the coupling between the cavities, and of the coupling between the cavities 2 and 5 and the filter ports.
  • Other screws with locking nuts, 20, 30, 40, 50, are respectively associated with the cavities 2, 3, 4, 5 into which they penetrate with an adjustable length so as to constitute a means of adjusting these cavities.
  • the filter as just described so far constitutes a conventional bandpass filter with four bandpass cavities; the following description of FIG. 1 will show how it is possible to combine these four cavities with four other cavities 6, 7, 8, 9 each having a role of band-cutting cavity.
  • Figure 1 shows that each of the cavities 2, 3, 4, 5, is pierced with an iris 60, 70, 80, 90 located on the long side of the waveguide opposite to that which is crossed by the adjustment screws 20, 30, 40, 50 and opposite these adjustment screws.
  • These irises constitute a coupling element between respectively the cavities 2, 3, 4, 5, and four band-cutting cavities 6, 7, 8, 9 constituted by sections of waveguides of the same section as the waveguide 1 arranged perpendicular to the long side of the guide d wave 1, having their short sides located in the same plane as the short sides of the waveguide 1 and whose height is substantially less than .
  • These sections of waveguides are welded at one end to the waveguide 1 and are closed at their other end by a metal plate that a screw, 61, 71, 81, 91, associated with a locking nut, cross so as to ensure the adjustment of these cavities.
  • these cavities 6, 7, 8, 9 can be considered as being in series with the band-pass cavities 2, 3, 4, 5; they therefore add their notch function to the band pass function of the cavities of the guide 1, so that the filter according to FIG. 1 is equivalent to a band pass filter associated in series with a band cut filter.
  • Figure 2 is a top view of the filter according to the invention; in this figure the band-cutting cavity 9 has been shown in section along a plane XX indicated in FIG. 1.
  • FIG. 2 shows, by comparing with FIG. 1, that the bandpass cavities of the filter are produced by means of the pairs of rods T 1 -T ' 1 , T2-T' 2 , T 3 -T ' 3 , T4- T'4, T 5 -T ' 5 perpendicular to the long side of the guide.
  • Figure 2 also shows that each pair of rods and the screw for adjusting the inter-cavity coupling (12 to 16) are arranged in the same transverse plane of the guide 1. From the ends of the guide towards the center, the rods have their diameter which increases while that the spacing between the two rods of the same pair decreases.
  • FIG. 1 shows, by comparing with FIG. 1, that the bandpass cavities of the filter are produced by means of the pairs of rods T 1 -T ' 1 , T2-T' 2 , T 3 -T ' 3 , T4- T'4, T 5 -T ' 5 perpendicular to the long side of the guide.
  • Figure 2 also shows that each pair
  • the irises such as 90 used for coupling between a band-cutting cavity, such as 9, and a band-pass cavity, have an oblong shape, the major axis of which, not shown, is perpendicular to the edges of the guide 1 .
  • FIG. 3 is an end view, on the side of the flange 10, of the filter already shown in FIGS. 1 and 2.
  • the adjustment screws 12 and 20 Through the opening of the guide 1 appear the adjustment screws 12 and 20 as well as the rods T 1 and T ' l and the stems T 2, T' 2 , T 3 , T ' 3 partially hidden.
  • the band-cutting cavity 6 and the screw with locking nut, 61 allowing the adjustment of this cavity.
  • the flange 10 is a square flange pierced, in the vicinity of its four angles, with threaded holes, 101 to 104, intended to allow the mechanical connection of the filter to the other elements of the assemblies for which it is intended.
  • FIG. 4 is a graph showing, by two curves A and B, the frequency responses of the filter according to FIGS. 1 to 3 (curve A) and of this same filter without the notch qualities 6 to 9 and without the irises of coupling 60, 70, 80, 90 (curve B), that is to say of a conventional band-pass filter.
  • FIG. 4 Also shown in FIG. 4 are the reflection losses due to the filter, as a function of the frequency (curve C).
  • curve C shows that in the flat part of the response curve of the filter according to Figures 1 to 3, the reflection losses are at most of the order of 25 dB, which corresponds to a standing wave ratio (ROS ) of 1.1.
  • ROS standing wave ratio
  • notch cavities 6 and 8 had been tuned on 7.9 GHz while the notch cavities 7 and 9 had been tuned on 8.3 GHz, which explains why both the flank before the rear flank of curve A have much steeper slopes than the corresponding flanks of curve B.
  • one or more notch cavities will be coupled respectively to one or more bandpass cavities of the conventional filter; the choice of the number of notch cavities and their tuning frequency depends on the shape of the flanks to be obtained, it being understood that the tuning frequency will be one of the frequencies relating to the flanks to be obtained.
  • the invention is not limited to the example described.
  • the shunt susceptances formed of rods which separate the band pass cavities, can be replaced by shunt susceptances of the iris or flap type and the number of band cut cavities can be lower.
  • the number of bandpass cavities of the filter some of the band pass cavities are therefore not associated with a band cut cavity.
  • the band-cut cavities can be arranged differently with respect to the guide of the band-pass cavities, for example always perpendicular to one of the long sides of this guide but with the large sides of their cross section making an angle different from 90 ° with the transverse edges of the guide; experience has shown that it is also possible to arrange the band-cut cavities perpendicular to the short sides of the guide of the band-pass cavities.
  • the number and the location of the notch cavities are parameters which make it possible to intervene on the shape of the frequency response of the filter according to the invention.

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EP82400757A 1981-05-08 1982-04-27 Bandpassfilter, ausgeführt in Rechteckhohlleitertechnik, mit hoher Selektivität Withdrawn EP0064458A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8109225A FR2505557A1 (fr) 1981-05-08 1981-05-08 Filtre passe-bande en guide rectangulaire, presentant une grande selectivite en frequence
FR8109225 1981-05-08

Publications (1)

Publication Number Publication Date
EP0064458A1 true EP0064458A1 (de) 1982-11-10

Family

ID=9258232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400757A Withdrawn EP0064458A1 (de) 1981-05-08 1982-04-27 Bandpassfilter, ausgeführt in Rechteckhohlleitertechnik, mit hoher Selektivität

Country Status (3)

Country Link
EP (1) EP0064458A1 (de)
JP (1) JPS57194602A (de)
FR (1) FR2505557A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994005056A1 (en) * 1992-08-15 1994-03-03 Filtronic Comtek Plc Microwave filter
WO2000026985A1 (fr) * 1998-11-02 2000-05-11 Jury Vyacheslavovich Kislyakov Filtre micro-ondes
EP1250758A1 (de) * 2000-01-26 2002-10-23 Acoustic Technologies, Inc. Bandpassfilter mit verbesserter gruppenlaufzeit
CN110767969A (zh) * 2018-07-27 2020-02-07 中兴通讯股份有限公司 一种腔体滤波器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59226501A (ja) * 1983-06-08 1984-12-19 Nippon Hoso Kyokai <Nhk> マイクロ波濾波器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882434A (en) * 1973-08-01 1975-05-06 Microwave Dev Lab Phase equalized filter
FR2431774A1 (fr) * 1978-07-19 1980-02-15 Communications Satellite Corp Filtres micro-ondes a bande etroite de fonction elliptique d'ordre impair

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882434A (en) * 1973-08-01 1975-05-06 Microwave Dev Lab Phase equalized filter
FR2431774A1 (fr) * 1978-07-19 1980-02-15 Communications Satellite Corp Filtres micro-ondes a bande etroite de fonction elliptique d'ordre impair

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON M.T.T., vol. 22, no. 1, janvier 1974, pages 1-5, New York, US *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994005056A1 (en) * 1992-08-15 1994-03-03 Filtronic Comtek Plc Microwave filter
WO2000026985A1 (fr) * 1998-11-02 2000-05-11 Jury Vyacheslavovich Kislyakov Filtre micro-ondes
EP1250758A1 (de) * 2000-01-26 2002-10-23 Acoustic Technologies, Inc. Bandpassfilter mit verbesserter gruppenlaufzeit
EP1250758A4 (de) * 2000-01-26 2004-12-15 Acoustic Tech Inc Bandpassfilter mit verbesserter gruppenlaufzeit
CN110767969A (zh) * 2018-07-27 2020-02-07 中兴通讯股份有限公司 一种腔体滤波器

Also Published As

Publication number Publication date
FR2505557A1 (fr) 1982-11-12
JPS57194602A (en) 1982-11-30

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: LE NOHAIC, YVES

Inventor name: SAUVAGE, MARC