EP1471595A1 - Resonante Hohlraumanordnung mit Umwandlung von transversalen Abmessungsänderungen, durch Temperaturschwankungen verursacht, in longitudinale Abmessungsänderungen - Google Patents

Resonante Hohlraumanordnung mit Umwandlung von transversalen Abmessungsänderungen, durch Temperaturschwankungen verursacht, in longitudinale Abmessungsänderungen Download PDF

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Publication number
EP1471595A1
EP1471595A1 EP04290816A EP04290816A EP1471595A1 EP 1471595 A1 EP1471595 A1 EP 1471595A1 EP 04290816 A EP04290816 A EP 04290816A EP 04290816 A EP04290816 A EP 04290816A EP 1471595 A1 EP1471595 A1 EP 1471595A1
Authority
EP
European Patent Office
Prior art keywords
secured
thermal expansion
coefficient
plate
end wall
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Withdrawn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
EP04290816A
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English (en)
French (fr)
Inventor
Bertrand Brevart
Frédéric Rouchaud
Michel Blanquet
Damien Pacaud
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.)
Alcatel Lucent SAS
Original Assignee
Alcatel CIT SA
Alcatel 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 Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP1471595A1 publication Critical patent/EP1471595A1/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Withdrawn legal-status Critical Current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
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators

Definitions

  • the invention relates to the field of resonant cavity devices.
  • Certain resonant cavity (s) devices consist of a waveguide body having a side wall extending along a longitudinal direction and delimiting at least one resonant cavity with two opposite end walls.
  • a first solution consists in using an aluminum device, and to interrupt its operation when its temperature exceeds a threshold fixed. This eliminates the need to oversize the multiplexer so that it supports out of band operation. But, this requires coupling the resonant cavity device to a thermal control device.
  • a second solution also consists in using a device in aluminum, and to equip it with a heat dissipation device, such as example of braids.
  • a heat dissipation device such as example of braids.
  • this solution turns out to be unsuitable when the resonant cavity device must withstand both high levels of high power and interface temperatures.
  • this solution leads to overweight.
  • a third solution consists in using a device whose walls are made of a material with a very low coefficient thermal expansion over a wide temperature range, such as the INVAR (nickel-steel alloy). But, if these materials have a interesting coefficient of thermal expansion, they generally do not offer low weight and / or low cost and / or good thermal conductivity. In addition, resonant cavity devices made entirely of INVAR have reached their limits in the face of power surges and temperatures current interface (this results from the fact that the expansion coefficient INVAR (or CTE) is not zero).
  • INVAR nickel-steel alloy
  • a fourth solution is to use an aluminum device, and to adapt at least one of its end walls.
  • the device described in document US 6,002,310 includes an end wall fitted with a first INVAR wall, the part of which central has been thinned, and a second aluminum wall, shaped domed, secured to the thick peripheral edge of the first wall end.
  • the second wall bulging expands in its central part which increases its bulging and forces the first INVAR wall to flex, thus amplifying the phenomenon bulging.
  • the device described in document EP 1187247 proposes a substantially equivalent solution. Catching up on variations dimensions of the devices described in these two documents are limited in amplitude, which limits the Omux power and interface temperature to which they are coupled.
  • the invention therefore aims to improve the situation.
  • a device with a resonant cavity comprising a waveguide body comprising a side wall, which extends along a longitudinal direction (perpendicular to a transverse plane), presenting a first coefficient of thermal expansion and delimiting a resonant cavity with first and second opposite end walls and substantially contained in transverse plans.
  • This device is characterized by the fact that its first wall end has a second coefficient of thermal expansion strictly lower than the first coefficient and includes an internal face secured to a first assembly comprising at least one main transverse plate, having a third coefficient of thermal expansion, strictly lower than the first, and of dimensions, in the transverse plane, substantially equal, by lower values, to those of the cavity, and an element intermediate with a fourth coefficient of thermal expansion strictly higher than the third, with an end part fixedly secured to the main plate and arranged, when a temperature variation, to transform its dimensional variations in the transverse plane in a dimensional variation according to the direction longitudinal, which induces a longitudinal translation of the main plate to inside the cavity.
  • the element intermediate By acting in a similar way to a “piston", the element intermediate causes the displacement of the main plate to which it is joined together, thus making it possible to compensate for the dimensional variations of the resonant cavity.
  • the device can include at least a second set, preferably substantially identical to the first set, and secured to the latter at its plate main.
  • several sets can be installed in serial when the device is likely to be subject to strong variations dimensional.
  • the device can include a first set comprising at least two intermediate elements substantially identical and joined to each other, for example by a outer ring which has the third coefficient of thermal expansion.
  • the intermediate element furthest from the first end wall is then secured by its end portion to the main plate. This allows also to compensate for strong dimensional variations.
  • the first set can be secured to the first end wall by its intermediate element.
  • the intermediate plate can also provide an intermediate plate interposed between the first assembly, to which it is secured, and the first end wall, to which it is secured.
  • the intermediate plate has the third coefficient of thermal expansion and dimensions in the transverse plane substantially equal, by lower values, to those of the cavity.
  • This intermediate plate can itself be secured to the first wall end through a shim plate having preferably the fourth coefficient of thermal expansion and substantially equal dimensions in the transverse plane, by values lower than those of the cavity. This advantageously makes it possible to control the center frequency of the frequency band of the resonant cavity.
  • the side wall can be secured to the first or second end wall via at least one shim chosen.
  • each intermediate element comprises a central part extended by first and second peripheral edges inclined at selected angles, on either side of a transverse plane containing the central part, by defining a peripheral groove, by “V” shaped example.
  • Each peripheral edge can then include an end part secured to the main plate, the plate intermediate or the first end wall, opposite which it is located.
  • each main plate and / or each plate intermediate and / or the first end wall may include a stop longitudinal device against which the end portion of the peripheral edge to which it is secured.
  • the side wall and / or the second wall end and / or each intermediate element and / or each plate of wedging is made of aluminum.
  • the intermediate plate and / or the first end wall and / or each block and / or each main plate can be made of an alloy of nickel and steel, of the INVAR type.
  • the object of the invention is to allow compensation for variations induced in a resonant cavity device by temperature variations.
  • the resonant cavity device equips an “Omux” type multiplexer (or “Output multiplexer”), and that is intended to filter microwave signals.
  • the device provides filtering on a 54 MHz frequency band.
  • the resonant cavity is of tubular shape (circular cylindrical).
  • the invention is not limited to this single type of cavity. It also concerns the resonant cavities of section transverse rectangular or elliptical.
  • the elements which bear identical references perform functions that are substantially identical.
  • Figure 1 We first refer to Figure 1 to describe a first mode for producing a resonant cavity device according to the invention.
  • the resonant cavity device D includes a waveguide body having a side wall 1, which extends in a longitudinal direction OX and delimits a resonant cavity CR with first 2 and second 3 opposite end walls and substantially contained in planes transverse (perpendicular to the direction OX and parallel to the direction OY).
  • the resonant cavity CR here being of circular cylindrical shape, the side wall 1 therefore defines a circular cylinder while the first 2 and second 3 end walls are disc-shaped.
  • the side wall 1 has a first coefficient of expansion thermal (CTE1). It is for example made of aluminum.
  • the first one end wall 2 has a second coefficient of thermal expansion (CTE2) strictly lower than the first coefficient CTE1, and preferably close to zero. It is for example made of INVAR (alloy nickel-steel).
  • the second end wall 3 presents the first coefficient of thermal expansion (CTE1). It is for example carried out in aluminum.
  • the side wall 1 has at each of its two opposite ends a transverse edge allowing its attachment to the first 2 and second 3 end walls, for example via a bolt 4.
  • the second end wall 3 has a opening 5 allowing both input and extraction of signals microwave frequencies to be filtered.
  • access to the resonant cavity CR could be provided on the side wall 1.
  • the device according to the invention D also comprises at least one first set E1 comprising, on the one hand, a main plate transverse 6, having a third coefficient of thermal expansion CTE3, strictly lower than the first CTE1, and of dimensions in the plane transverse substantially equal, by lower values, to those of the cavity resonant CR, and on the other hand, an intermediate element 7 having a fourth coefficient of thermal expansion CTE4, strictly greater than third CTE3, comprising a first end portion 8 secured fixed to the main plate 6 and a second end portion 9 fixedly fixed to an internal face (oriented towards the inside of the cavity CR) of the first end wall 2.
  • the resonant cavity CR here being of circular cylindrical shape
  • the main plate 6 is in the shape of a disc of diameter L.
  • the first CTE1 and fourth CTE4 coefficients thermal expansion are identical.
  • the intermediate element 7 is made of aluminum.
  • the second CTE2 and third CTE3 thermal expansion coefficients are preferably identical.
  • the main plate 6 is made of INVAR.
  • the intermediate element 7 has a longitudinal extension h and is specifically arranged to transform its variations dimensional ⁇ L (expansion) in the transverse plane, induced by a temperature variation, in a dimensional variation ⁇ h depending on the OX longitudinal direction.
  • the dimensional variation ⁇ h in the longitudinal direction OX causes the longitudinal translation of the main plate 6 inside of the resonant cavity CR.
  • the greater the variation dimension ⁇ L of the intermediate element 7 is large the more its variation dimensional ⁇ h is important and therefore more the amplitude of the translation longitudinal of the main plate 6 is large. This allows to control the dimensional variations of the resonant cavity CR, so that its central operating frequency remains appreciably constant over a selected temperature range.
  • the intermediate element 7 has a central part 10 extended by first 11 and second 12 peripheral edges (here circular) inclined at angles chosen on either side and on the other side of a transverse plane containing the central part 10, defining a peripheral throat.
  • each angle is preferably identical. They are chosen in depending on the amplitude of the desired translation. For example, each angle is a few tens of degrees, typically 20 ° to 45 °.
  • the peripheral groove has for example a section in the form of "V”. But, it can also be in the shape of a crescent moon, or "U” open, and the like.
  • peripheral edges 11 and 12 are each terminated by one of the transverse end portions 8, 9, respectively secured to the plate main 6 and at the first end wall 2.
  • the main plate 6 and the first end wall 2 have preferably each a circular longitudinal peripheral stop 13 against which the end portion 8 or 9 of the peripheral edge 11 rests or 12 to which it is attached.
  • This embodiment is a variant of the first embodiment. embodiment, described above with reference to FIG. 1, in which the first set E1 ′ does not have a single intermediate element, but two 7a and 7b.
  • a first element intermediate 7a is secured, on the one hand, by its peripheral edge 11 to the main plate 6, and on the other hand, by its peripheral edge 12 at the edge peripheral 11 of a second intermediate element 7b, the other edge of which peripheral 12 is secured to the internal face of the first wall end 2.
  • the peripheral edges 12 and 11, respectively intermediate elements 7a and 7b, are joined by a outer ring 17 which has the third coefficient of expansion thermal.
  • this ring 17 is made of INVAR.
  • the intermediate elements 7, thus mounted in series are substantially identical. But this is not compulsory.
  • This embodiment compensates for large variations dimensional.
  • the number of intermediate elements 7 constituting the first set E1 ′ may be different from two.
  • This embodiment includes a first set E1, substantially identical to that described above with reference to the figure 1, secured to a second set E2, also consisting of a plate main 6-2 secured to an intermediate element 7-2.
  • the edge peripheral 12 of the intermediate element 7-1 of the first set E1 is secured to an internal face of the main plate 6-2 of the second set E2
  • the peripheral edge 12 of the intermediate element 7-2 of the second set E2 is secured to the internal face of the first wall end 2.
  • the main plate 6-2 also has on its internal face a second peripheral stop longitudinal circular 13 against which the end portion 9 of the peripheral edge 12 of the intermediate element 7-1.
  • the assemblies E1 and E2, thus connected in series are substantially identical. But this is not mandatory.
  • This embodiment also makes it possible to compensate for strong dimensional variations.
  • the number of sets mounted in series may be different from two.
  • This embodiment is a variant of the third embodiment. embodiment, described above with reference to FIG. 3, in which checks the longitudinal dimension of the resonant cavity CR using a or several shims 14 of selected thicknesses, of a shim plate 15 of selected thickness and / or of an intermediate plate of selected thickness 16.
  • one or more several shims 14 produced in the form of washers whose thicknesses are chosen according to the central operating frequency of the resonant cavity and the height of the sets E1 and E2 and the sum of their amplitudes of longitudinal displacement ⁇ h.
  • These washers 14 are for example interposed between the first end wall 2 and one of the transverse edges of the side wall 1. But, they could be placed at the other end of the resonant cavity CR, between the second wall end 3 and the other transverse edge of the side wall 1 or else level of each end.
  • Each wedge 14 is preferably made of a material with a very low coefficient of thermal expansion, such as the INVAR example.
  • a wedging plate 15 is also provided, of a firstly, to the internal face of the first wall 2, and secondly, to a face (external) of an intermediate plate 16, the internal face of which is secured to the end portion 9 of the peripheral edge 12 of the intermediate element 7-2 of the second set E2.
  • the timing plate 15 is preferably made of aluminum (high CTE material).
  • the intermediate plate 16 is preferably substantially identical to a main plate 6, both by its dimensions only by its longitudinal peripheral stop 13 and by the material in which it is made.
  • the invention is not limited to the embodiments of device to resonant cavity (ies) described above, only by way of example, but it includes all the variants that a person skilled in the art will be able to envisage in the The scope of the claims below.

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EP04290816A 2003-04-25 2004-03-26 Resonante Hohlraumanordnung mit Umwandlung von transversalen Abmessungsänderungen, durch Temperaturschwankungen verursacht, in longitudinale Abmessungsänderungen Withdrawn EP1471595A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0305096 2003-04-25
FR0305096A FR2854279B1 (fr) 2003-04-25 2003-04-25 Dispositif a cavite resonnante a conversion de variation dimensionnelle transversale, induite par une variation de temperature, en variation dimensionnelle longitudinale

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Publication Number Publication Date
EP1471595A1 true EP1471595A1 (de) 2004-10-27

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EP04290816A Withdrawn EP1471595A1 (de) 2003-04-25 2004-03-26 Resonante Hohlraumanordnung mit Umwandlung von transversalen Abmessungsänderungen, durch Temperaturschwankungen verursacht, in longitudinale Abmessungsänderungen

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US (1) US6960969B2 (de)
EP (1) EP1471595A1 (de)
CA (1) CA2456689A1 (de)
FR (1) FR2854279B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7564327B2 (en) * 2006-10-05 2009-07-21 Com Dev International Ltd. Thermal expansion compensation assemblies
FR2945673B1 (fr) * 2009-05-15 2012-04-06 Thales Sa Dispositif de paroi flexible multi-membranes pour filtres et multiplexeurs de technologie thermo-compensee
FR2954597B1 (fr) * 2009-12-23 2015-01-02 Thales Sa Actionneur thermo-elastique compact pour guide d'ondes, guide d'ondes a stabilite de phase et dispositif de multiplexage comportant un tel actionneur.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488132A (en) * 1982-08-25 1984-12-11 Com Dev Ltd. Temperature compensated resonant cavity
DE4113302A1 (de) * 1991-04-24 1992-10-29 Ant Nachrichtentech Topfkreis oder belasteter hohlraumresonator mit temperaturkompensation
US5905419A (en) * 1997-06-18 1999-05-18 Adc Solitra, Inc. Temperature compensation structure for resonator cavity
EP0939450A1 (de) * 1998-02-27 1999-09-01 Hughes Electronics Corporation Stirnwandanordnung für Hohlraumresonator
US5977849A (en) * 1997-07-22 1999-11-02 Huhges Electronics Corporation Variable topography electromagnetic wave tuning device, and operating method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6232852B1 (en) * 1999-02-16 2001-05-15 Andrew Passive Power Products, Inc. Temperature compensated high power bandpass filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488132A (en) * 1982-08-25 1984-12-11 Com Dev Ltd. Temperature compensated resonant cavity
DE4113302A1 (de) * 1991-04-24 1992-10-29 Ant Nachrichtentech Topfkreis oder belasteter hohlraumresonator mit temperaturkompensation
US5905419A (en) * 1997-06-18 1999-05-18 Adc Solitra, Inc. Temperature compensation structure for resonator cavity
US5977849A (en) * 1997-07-22 1999-11-02 Huhges Electronics Corporation Variable topography electromagnetic wave tuning device, and operating method
EP0939450A1 (de) * 1998-02-27 1999-09-01 Hughes Electronics Corporation Stirnwandanordnung für Hohlraumresonator

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Publication number Publication date
US6960969B2 (en) 2005-11-01
CA2456689A1 (fr) 2004-10-25
FR2854279B1 (fr) 2005-07-08
FR2854279A1 (fr) 2004-10-29
US20040212463A1 (en) 2004-10-28

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