EP0966057A1 - Einstellbares Dämpfungsglied für Rechteckhohlleiter - Google Patents

Einstellbares Dämpfungsglied für Rechteckhohlleiter Download PDF

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Publication number
EP0966057A1
EP0966057A1 EP98460022A EP98460022A EP0966057A1 EP 0966057 A1 EP0966057 A1 EP 0966057A1 EP 98460022 A EP98460022 A EP 98460022A EP 98460022 A EP98460022 A EP 98460022A EP 0966057 A1 EP0966057 A1 EP 0966057A1
Authority
EP
European Patent Office
Prior art keywords
plunger element
waveguide
plunger
attenuation device
variable attenuation
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Withdrawn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
EP98460022A
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English (en)
French (fr)
Inventor
Bernard Eveillard
Fabrizio Zovi
Alain Le Neve
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.)
TRT Lucent Technologies SA
Original Assignee
TRT Lucent Technologies 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 TRT Lucent Technologies SA filed Critical TRT Lucent Technologies SA
Priority to EP98460022A priority Critical patent/EP0966057A1/de
Priority to EP99303453A priority patent/EP0966058A1/de
Priority to JP11167885A priority patent/JP2000040902A/ja
Publication of EP0966057A1 publication Critical patent/EP0966057A1/de
Withdrawn legal-status Critical Current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
    • H01P1/22—Attenuating devices
    • H01P1/222—Waveguide attenuators

Definitions

  • the present invention relates to a device attenuation for rectangular waveguide. he finds its application particularly in the microwave equipment sector.
  • Attenuation devices it is relatively common to use attenuation devices to attenuate on a portion waveguide the electrical energy transmitted in order to regulate the level of power received by a circuit positioned downstream of the waveguide in the direction of wave propagation.
  • attenuators including attenuators based on PIN diodes and blade attenuators.
  • the current invention relates in particular to blade attenuators.
  • the principle of this type of attenuator consists in insert a blade into the waveguide through a slot longitudinal parallel to the axis of propagation of microwave waves.
  • the blade is made in a resistive material absorbing electrical energy propagated in the waveguide.
  • the incident wave propagating in the guide is attenuated during its passage in the guide portion crossed by the blade.
  • the magnitude of the attenuation is a function of the portion of blade introduced into the waveguide, which is responsible for obstructing the spread of the wave in the guide.
  • the magnitude of the attenuation is also a function of the position of the blade by relation to the plane of symmetry of the guide parallel to the field electric (plane where the amplitude of the electric field is maximum). Attenuation is maximum when the blade is introduced at the level of this plan, that is to say at the center of the waveguide.
  • a device of this type is described in the patent American No. 2,619,538. It includes a plunger disc of substantially planar shape intended to be introduced in a waveguide through a longitudinal slot along the wave propagation axis. This slot is made in the upper face of the guide, preferably in the middle.
  • the plunger disc is mounted on a drive shaft whose axis is orthogonal to the wave propagation axis. It is thus found in a plane parallel to the electric field of the waves electromagnetic.
  • the tree on which the disc is connected to an adjustable dial.
  • the outline of disc is not circular with respect to the center of the rotation shaft so that the rotation of the disc varies the disk area introduced into the waveguide.
  • a rotation of the dial causes a disc rotation which can be set to different angular positions corresponding to various amplitudes of attenuation.
  • the object of the invention is to solve the miniaturization problems encountered with existing devices. Indeed, to obtain attenuation values of several tens of decibels, it is necessary that the portion of disc introduced in the waveguide is relatively large. AT For this purpose, the existing devices are provided with a high radius plunger to increase the portion of disc immersed in the guide.
  • the present invention aims to overcome this major disadvantage of the prior art by proposing a relatively attenuating device compact and simple in design.
  • the subject of the invention is a variable attenuation device for a rectangular waveguide, of the type comprising a substantially flat plunger element and of rounded shape intended to be introduced perpendicularly into said waveguide through a longitudinal slot practiced along the axis of propagation of the waves in a first face of said guide, the plunger element being movable in rotation about an eccentric axis so that the portion of the plunger element introduced into the waveguide is a function of the angular position of said plunger element, characterized in that said plunger element and said longitudinal slot are arranged at an elbow formed by said waveguide.
  • the shape of the contour of the plunger element and the position of its axis are planned so that mitigation is linearly dependent on the angular position of the plunger element.
  • the contour of the plunger element and the position of its axis of rotation are then defined so that, in a first extreme angular position, the contour of the plunger element is tangent to the first face of the bend so that the portion of the element plunger introduced into the waveguide is zero, and in a second extreme angular position, the plunger element passes completely through the guide waves at the elbow so that the portion of the plunger element introduced into the guide of waves is maximum.
  • a cut is performed, at the elbow, in the face opposite the first side of the waveguide so that the element diver can completely cross the guide waves.
  • variable attenuation device has a body formed of two symmetrical parts each comprising a groove and a blind recess opening at the interior of said groove so that a once the two parts are assembled, the grooves form said waveguide and the blind recesses a cavity intended to receive the plunger element, which plunger element is introduced into said waveguide at the intersection between said grooves and said blind recesses corresponding to said slot longitudinal.
  • the axis of rotation of the element diver can be positioned so that the distance from the first straight part of the plunger element is greater than that which separates from the second straight part.
  • variable attenuator according to the invention is also remarkable for its training system of the plunger element.
  • the plunger element is mounted on a shaft rotary drive, which shaft has a end pinion to be coupled externally to a motor carried on an L-shaped support fixed by its base on the body.
  • This plunger shaft is engaged in a swivel ring passing through the body and the base of said engine support by passage bores adjusted to its outside diameter, the ring comprising an internal end shoulder intended to come bear on the edge of said bore, and being on the other hand interposed on the shaft between a shoulder internal thereof and said drive pinion, this last being engaged on the outer end of the shaft, and adjusted and held axially thereon by means of a screw returning to the end of the shaft.
  • Figure 1 shows an exploded view of a attenuation device according to the invention.
  • This device consists of a body formed of two symmetrical parts 1 and 2. These parts 1 and 2 each have a groove 3 (not visible on the part 2) of depth equal to a and of width equal to b and a blind recess 4 (not visible on the part 2) of depth equal to c opening inside the groove.
  • the two opposite grooves form a waveguide of width 2 * a and height b and the two recesses blinds form a cavity containing an element plunger 5 mobile in rotation about an axis eccentric 6 orthogonal to said parts 1 and 2.
  • These parts 1 and 2 are produced by machining a block of a conductive material such as aluminum.
  • the intersection between the grooves 3 and the recesses blind 4 constitute a longitudinal slot 7 by which the plunger element 5 is introduced into the waveguide.
  • the cavity is circular in shape and its center coincides with the axis of rotation 6 of the plunger element 5.
  • Holes 8 and 9 are dug in parts 1 and 2 respectively to receive a rotation shaft 10 of the plunger element 5.
  • the radius of the cavity is taken greater than the greatest distance between the axis of rotation 6 and the contour of the element plunger 5, and the thickness of the plunger element is less than 2 * c.
  • said grooves 3 comprise at least one curved section so that the waveguide formed by the two grooves form an elbow and that the plunger element 5 is introduced into the guide waves at this elbow.
  • the longitudinal slot 7 is at this elbow.
  • the introduction of the plunger element at this curved section of the guide increases the portion of the plunger element immersed in the guide without having to increase the size of this element. For same attenuation value, we can reduce by very sensitive the size of the plunger element relative to a straight waveguide.
  • the elbow shown in Figures 1 to 9 of the present application is a 90 ° elbow. We could consider using shift elbows different direction; the gain in size of the attenuator would then be more or less interesting according to the angle value of this elbow.
  • FIGS. 2 and 3 The pivoting of the plunger element 5 around its axis of rotation 6 is illustrated in FIGS. 2 and 3.
  • the outline of the plunger element 5 is tangent to the inner face of the guide at the curved section 11 and straight sections 12 and 13, and the portion of the plunger element in the waveguide is zero.
  • the guide wave formed by the grooves 3 approximates a perfect waveguide (the plunger element blocking the slit without overflowing in the guide), the attenuation generated by the attenuator in this position is then zero.
  • the attenuation is chosen from so as to be linearly dependent on the position angle of the plunger element.
  • This dependence is linked to the shape of the contour of the plunger element 5 and the position of its axis of rotation 6 with respect to the groove 3.
  • D1 the distance separating the axis of rotation 6 of the inner face of the section straight line 12 of the guide and D2 the distance between the axis of rotation 6 of the inner face of the section straight 13 of the guide
  • D1> D2 to obtain a linear dependence knowing that the plunger element 5 rotates counterclockwise.
  • This eccentric position of axis 6 relative to the straight sections 12 and 13 of the guide will allow to introduce the plunger element more strongly into the waveguide for low angular values of the plunger element.
  • a cutout 14 is formed in the outer face of the guide waves, at the curved section 11 and the section straight 13, so that the plunger element can completely cross the waveguide and rotate without cluttered around its axis of rotation.
  • Cutout 14a the shape of a circular arc of the same radius and the same center that the cavity formed by the two recesses blind 4. Cutout 14 is made at the same time as the blind recess 4 during the same operation machining.
  • Linearization of the attenuation curve can be refined by acting on the shape of the outline of the plunger element.
  • a preferred embodiment of the plunger element is shown in Figure 4. This contour shape has been determined so empirical.
  • the contour of the plunger element 5 has two portions orthogonal rectilinear 15 and 16 whose ends neighbors meet at a bend 17 conforming to waveguide bend. The remaining part of the outline between the distal ends of portions 15 and 16 is a curved segment 18, essentially convex.
  • the center of rotation of the plunger element 5 is no equidistant from the two rectilinear portions 15 and 16, either in the embodiment shown, plus close to portion 16.
  • a prototype was produced with the following dimensions which are particularly useful for defining the shape of the curved segment 18.
  • R1 the distance between the straight portion 15 and the center of rotation 6 and R2 the distance between the straight portion 16 and the center of rotation.
  • R1 13.2 mm
  • R2 16.7 mm
  • the curved segment 18 is defined by a series of values R ( ⁇ ) each representing the distance between a point of the curved segment 18 and the center of rotation, where ⁇ denotes the angle between the distal end of the restilinear portion 15 and the point of the curved segment considered and varies between 0 ° and 180 °.
  • R (0 °) and R (180 °) correspond respectively to the distance separating the distal ends of the rectilinear portions 15 and 16 from the center of rotation of the plunger element. All the R ( ⁇ ) values relating to the prototype are contained in the table appended. These values are indicated every 9 °.
  • variable attenuator according to the invention is also remarkable for the drive system in rotation of its designed plunger element especially for reliability of optimal operation, taking into account all conditions of use which are often severe, especially with regard to temperature variations which can reach more than 100 ° C by giving birth to a significant risk of mechanical seizure.
  • the plunger element 5 is integral with a shaft 21 passing through the body part 2 by a bore of passage 24, to be driven externally by a motor 19.
  • the plunger shaft 21 is provided at the end with a pinion 20 driven by the shaft motor output 19.
  • the pinion 20 has a profile periphery concave intended to partially wrap the motor shaft 19, on a portion of it forming worm, meshed with teeth complementary to said concave periphery.
  • the motor 19 is mounted on the wing of an L 22 support whose base is applied and fixed on the outer wall of the part body 2, the output shaft of the motor 19 passing through said wing; and on the other hand, the plunger shaft 21 is mounted without play in a swivel ring 23, which is supported to support at the level of its inner end on the edge of the bore of passage 24, passes through said body part 2 by this, then the base of the L-shaped support by a bore 25, the two bores 24 and 25 being adjusted to its outside diameter. Bores 24 and 25 are indicated in Figure 9.
  • the ring journal 23 is interposed between a internal shoulder of the latter 26 and the pinion 20 which is engaged on the outer end of the shaft, and adjusted and held in position with a screw end 27.
  • the ring 23 also determines the positioning of the plunger 5 in the direction of its axis of rotation. Indeed, as clearly shown in FIG. 8, the plunger element 5, engaged on its shaft 21, is retained between a shoulder 28 of this and the inner end of the ring 23, so at a distance from the bottom of the blind recess 4 in the body part 2 which corresponds to the axial distance between the inner end of the ring 23 and its shoulder 28.
  • FIG. 10 there are shown some values of the attenuation generated by an attenuation device corresponding to the preferred embodiment of the invention as a function of the angular position of its plunger element.
  • the plunger element used is that shown in FIG. 4 with a thickness of 2 mm.
  • the attenuation values are given for an incident signal with a frequency of 13 GHz.
  • the attenuation is shown for the angular position values between 0 ° corresponding to the case where the contour of the plunger element is tangent to the inside face of the waveguide and 235 ° corresponding to a pivoting of the plunger element 235 ° anti-clockwise (position for which the attenuation is maximum).
  • This attenuation curve shows that the attenuation of the incident wave does not only result from the absorption of its energy by the plunger element 5, otherwise the maximum value of the attenuation would be around the 180 ° position. (it would not be exactly 180 ° due to the non-uniformity of the curved portion 18 of the plunger element 5). It seems that phenomena of reflection of the incident wave explains this shift in the angular position of the maximum.

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  • Non-Reversible Transmitting Devices (AREA)
EP98460022A 1998-06-15 1998-06-15 Einstellbares Dämpfungsglied für Rechteckhohlleiter Withdrawn EP0966057A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP98460022A EP0966057A1 (de) 1998-06-15 1998-06-15 Einstellbares Dämpfungsglied für Rechteckhohlleiter
EP99303453A EP0966058A1 (de) 1998-06-15 1999-05-04 Einstellbares Dämpfungsglied für Rechteckhohlleiter
JP11167885A JP2000040902A (ja) 1998-06-15 1999-06-15 長方形導波路用可変減衰器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98460022A EP0966057A1 (de) 1998-06-15 1998-06-15 Einstellbares Dämpfungsglied für Rechteckhohlleiter

Publications (1)

Publication Number Publication Date
EP0966057A1 true EP0966057A1 (de) 1999-12-22

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EP98460022A Withdrawn EP0966057A1 (de) 1998-06-15 1998-06-15 Einstellbares Dämpfungsglied für Rechteckhohlleiter

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JP (1) JP2000040902A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1371112B1 (de) * 2001-03-21 2007-05-02 Microface Co. Ltd Wellenleiter-schlitzantenne und herstellungsverfahren dafür

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491644A (en) * 1945-08-24 1949-12-20 Bell Telephone Labor Inc Attenuator
GB640057A (en) * 1947-12-30 1950-07-12 Waldemar Rosenberg Improvements in or relating to electromagnetic wave guides
US2613270A (en) * 1946-05-24 1952-10-07 Aircraft Radio Corp Wave guide attenuator
US2619538A (en) * 1944-05-23 1952-11-25 Westinghouse Electric Corp Wave guide attenuator
DE1910362A1 (de) * 1969-02-28 1970-09-17 Licentia Gmbh Anordnung zum Erzeugen einer einstellbaren Einfuegdaempfung
JPS57194604A (en) * 1981-05-27 1982-11-30 Nec Corp Waveguide variable attenuator
DE3608451A1 (de) * 1986-03-14 1987-09-17 Licentia Gmbh Daempfungsglied fuer hohlleiter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619538A (en) * 1944-05-23 1952-11-25 Westinghouse Electric Corp Wave guide attenuator
US2491644A (en) * 1945-08-24 1949-12-20 Bell Telephone Labor Inc Attenuator
US2613270A (en) * 1946-05-24 1952-10-07 Aircraft Radio Corp Wave guide attenuator
GB640057A (en) * 1947-12-30 1950-07-12 Waldemar Rosenberg Improvements in or relating to electromagnetic wave guides
DE1910362A1 (de) * 1969-02-28 1970-09-17 Licentia Gmbh Anordnung zum Erzeugen einer einstellbaren Einfuegdaempfung
JPS57194604A (en) * 1981-05-27 1982-11-30 Nec Corp Waveguide variable attenuator
DE3608451A1 (de) * 1986-03-14 1987-09-17 Licentia Gmbh Daempfungsglied fuer hohlleiter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 45 (E - 160)<1190> 23 February 1983 (1983-02-23) *

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