EP0155296B1 - Temperaturkompensierter mikrowellenresonator mit einem spalt veränderlicher breite an einer stromnullstelle - Google Patents

Temperaturkompensierter mikrowellenresonator mit einem spalt veränderlicher breite an einer stromnullstelle Download PDF

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Publication number
EP0155296B1
EP0155296B1 EP19840903381 EP84903381A EP0155296B1 EP 0155296 B1 EP0155296 B1 EP 0155296B1 EP 19840903381 EP19840903381 EP 19840903381 EP 84903381 A EP84903381 A EP 84903381A EP 0155296 B1 EP0155296 B1 EP 0155296B1
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Prior art keywords
resonator
thermally
cavity
longitudinal
variations
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Expired
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EP19840903381
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English (en)
French (fr)
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EP0155296A1 (de
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Richard V. Basil, Jr.
Juri G. Leetmaa
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Raytheon Co
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Hughes Aircraft Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/30—Auxiliary devices for compensation of, or protection against, temperature or moisture effects ; for improving power handling capability
    • 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

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  • the invention relates in general to microwave resonators and in particular to techniques for compensating for thermally-induced dimensional variations in such resonators.
  • the present invention provides a means for generally decreasing the net operational complexity of such elements in other environments as well.
  • a microwave resonator is provided with features known from NL-A-7808556 recounted in the preamble of Claim 1 and characterised by the features given in the characterising part of Claim 1.
  • the invention provides a segmentation 105 in cavity 110.
  • the invention stipulates that the segmentation is to be formed at the location of a null in the current-distribution pattern which conventionally appears throughout the walls 125 of cavity 110 when matched-frequency microwave energy propagates through the resonator upon being applied at an input aperture such as iris 135.
  • cavity 110 is configured such that microwave energy, applied at input iris 135, is channeled along a propagational axis, with the cavity then possessing, with respect to this axis, characteristic longitudinal geometry and characteristic transverse geometry.
  • Cavity walls 125 may likewise be more-specifically described as including transversly-disposed end plates 155 and 160, with the relative separation between these plates thereby establishing the resonator's associated characteristic longitudinal extent measured with respect to the propagational axis.
  • Cavity walls 125 similarly include side walls 165, having in themselves an intrinsic longitudinal extent such as lengths "a" and "b".
  • the separate identification of side walls 165 makes it possible to describe the segmentation 105 as being a substantially circular gap between the lengths "a" and "b" comprising the side walls 165.
  • the segmentation 105 is substantially disposed between the end plates 155 and 160 about a longitudinal axis of the cavity 110 in a plane normal to the longitudinal axis.
  • the longitudinal axis of the cavity 110 also defines the path of current propagation within the cavity 110.
  • cavity 110 may be described as having been configured such that the propagational axis is a substantially straight line. Furthermore, the end plates 155 and 160 may then be stipulated to be orthogonally-disposed with respect to this straight axis.
  • a current-null segmentation such as the previously-described segmentation 105 in Figure 1, may be employed to provide the associated microwave resonator with a thermal-compensation capability.
  • thermal compensation is achieved by providing the resonator with a thermal-compensation mechanism which generally includes both a current-null segmentation and supplemental characteristic-compensation devices which are operatively associated with the cavity walls.
  • the current-null segmentation 105 operates to absorb thermally-induced variations in wall dimensions, while the supplemental devices operate to counteract thermally-induced variations in the resonator's characteristic geometry.
  • segmentation 105 By virtue of the manner in which the segmentation 105 is configured, its variational absorption takes place along the cavity-wall location of the propagational current null at which the given segmentation has been formed.
  • the variations thus absorbed are those which tend to occur across the segmented current null.
  • the thermal-compensation mechanism can be seen to more-specifically include the current-null segmentation 105 in conjunction with the schematically-illustrated characteristic-compensation devices 170 and 175.
  • segmentation 105 thus operating to absorb thermally-induced variations in the lengths of segments "a" and "b" of the sidewalls 165
  • the characteristic-compensation devices which can be seen to be operatively associated with the end plates 155 and 160 of cavity walls 125, provide the required counteraction of thermally-induced variations in the characteristic geometry of the resonator 100.
  • the illustrated example mechanization shows the devices 170 and 175 to be mounted exterior to cavity 110.
  • the exterior arrangement is preferred because it enables the cavity to remain free from internal obstructions which could otherwise adversely affect operational characteristics. (The deliberate insertion of tuning elements into the cavity will be separately discussed in a subsequent portion of the specification.)
  • a resonator such as the cylindrical one of Figure 1 in which the associated end plates 135 and 160 are configured to be mutually parallel
  • the devices' net compensation effects are evenly distributed around the periphery, thus causing the otherwise-parallel relationship between the end plates to be maintained during thermal-variation counteraction.
  • the resonator 100 may thus be seen in the sectional view of Figure 2 to include the three compensation devices 170, 175 and 180 symmetrically disposed at 120° intervals around the resonator's periphery.
  • the now-visible output iris 140 in end wall 160 will as illustrated typically be orthogonally oriented with respect to the input iris 135 shown in Figure 1.
  • the characteristic-stabilization devices generally described above may be more-specifically implemented in at least two different configurations.
  • the first of these configurations provides the resonator with thermal stabilization by inhibiting thermally-induced variations in various aspects of the resonator's characteristic geometry.
  • the second configuration in contrast affirmatively introduces characteristic variations which are inversely-proportional to those induced thermally.
  • the cavity is configured such that applied microwave energy is channeled along a propagational axis;
  • the cavity possesses, with respect to this propagational axis, both characteristic longitudinal geometry and characteristic transverse geometry;
  • the cavity walls include both (i) transversely-disposed end plates whose relative separation establishes the resonator's associated characteristic longitudinal extent and (ii) longitudinally-disposed side walls which have longitudinal extent; and fourth, at least one of the current nulls is a transverse null which is longitudinally disposed along the described side walls.
  • the characteristic-compensation devices of the previously-presented thermal-compensation mechanism may be more-specifically stipulated as including a thermally-nonresponsive, characteristic-stabilization mechanism which is operatively associated with the described transversely-disposed end plates and which operates to inhibit thermally-induced variations in the resonator's characteristic longitudinal extent.
  • the thermal-compensation mechanism's current-null segmentation may be more-particularly specified as being included in the described side walls of said cavity walls and (2) those dimensional variations specified to be absorbed by the segmentation are longitudinal variations in the extent of the side walls.
  • the segmentation would in this context be configured so that its absorption function is performed without in itself altering the characteristic longitudinal extent of the resonator.
  • FIG. 3 illustrate a prior art resonator 300 which uses a thermally stabilized bar assembly 370 to achieve some degree of dimensional stability despite changes in the thermal environment.
  • the figure schematically presents a cross-sectional view of a thermally-compensated resonator 300.
  • the illustrated resonator can be seen to be the more-specific form in which the four above-described particularized characteristics are present and in which cavity 310 is configured such that propagational axis 350 is a substantially straight line and end plates 355 and 360 are not only transversely-disposed and respect to the propagational axis but are more-specifically orthogonally-disposed with respect to this axis.
  • the current-null segmentation 305 is seen to be included in side walls 365 so that the dimensional variations absorbed by segmentation 305 are, as required, variations in the side-wall dimensional extents "a" and "b" as measured longitudinally with respect to the axis 350.
  • the characteristic stabilization mechanism encompasses thermally-stabilized bar assembly 370 which functions to hold end plates 355 and 360 in thermally-invariant characteristic longitudinal relationship.
  • bar assembly 370 may be yet-more-particularly described as featuring a rod 375 composed of a thermally-non responsive material such as Invar, quartz or a suitable graphite composite.
  • a presentation of the more-descriptive aspects of an embodiment of the present invention may begin by noting that it is intended to be implemented in the same type of particularized environment as that which was generally specified for the prior art configuration of Figure 3.
  • this four-featured environment includes (1) a propagational axis, (2) characteristic longitudinal and transverse geometries, (3) end-plate and side-wall component elements of the cavity walls and (4) the longitudinal, intra-side-wall disposition of a transverse current null.
  • an embodiment for the characteristic-compensation devices may be generally described as encompassing thermally-responsive, inverse characteristic-adjustment mechanisms which are operatively associated with the end plates and whose function is to vary the resonator's characteristic longitudinal extent so as to compensate for thermally-induced variations in the resonator's characteristic transverse extent. It is well known in the art that an increase in the dimensions of a microwave cavity will substantially reduce the resonant frequency of the cavity, and a decrease in cavity dimensions will substantially increase the resonant frequency of the cavity.
  • the adjustment mechanism is configured so that the affirmatively-induced longitudinal variations are inversely proportional to the thermally-occurring transverse variations.
  • the employment of the inverse characteristic-adjustment mechanisms for thermal-compensation purposes may be viewed as merely a specialized application of a more-general combination in a first aspect of which the inverse mechanism generically provides, within the described specific environment, the capability of varying the resonator's characteristic longitudinal extent so as to establish an inversely-proportional relationship between the longitudinal variations induced by the adjustment mechanism itself and thermally-induced variations in the resonator's overall characteristic geometry.
  • a second aspect of this more-general combination would typically be a current-null segmentation of the type which will presently be described below.
  • the current-null segmentation for this embodiment of the characteristic-compensation devices resembles that of the prior art configuration in that it is to once again absorb thermally-induced longitudinal variations in the described side-wall extent.
  • a supplemental requirement that the segmentation also absorb those longitudinal variations in the overall resonator's characteristic extent which are induced by the adjustment mechanism.
  • the segmentation's dimensional absorptions for the prior art configuration were such as to not in themselves after the resonator's characteristic longitudinal extent, so also is the supplemental absorption of characteristic longitudinal variations to not in itself be the cause of a further alteration of the resonator's characteristic longitudinal extent.
  • thermally-compensated microwave resonator 400 of Figure 4 possesses with respect to cavity 410 the same particularized features and properties as those which are specified to be part of the cavity for the first-described configuration of Figure 3.
  • the cavity 410 is thus again arranged so that the propagational axis 450 is a substantially straight line and so that the end plates 455 and 465 are orthogonally-disposed with respect to the propagational axis.
  • the cavity again includes side walls 465 into which has been formed the current-null segmentation 405.
  • the inverse characteristic-adjustment mechanism includes at least one differential-assembly unit.
  • Each such unit is to include two elements: The first is thermally-responsive and has a longitudinal extent which (a) terminates in opposite first and second ends and (b) is longitudinally disposed with respect to the described propagational axis. In this longitudinal disposition, the first end is required to be disposed toward the first end plate while the second end is required to be disposed toward the second end plate.
  • the second of the elements is a thermally-nonresponsive mechanism which in turn performs two functions: (a) It holds the first longitudinal end in thermally-invariant relationship with the second end plate and (b) it holds the second longitudinal end in thermally-invariant relationship with the first end plate.
  • the differential-assembly appears as general element 470.
  • This assembly 470 then includes, as the thermally-responsive element, the temperature-sensitive component 473.
  • Component 473 can be seen to be longitudinally disposed with respect to propagational axis 450 and hence possesses the illustrated longitudinal extent terminating in opposite ends 471 and 472.
  • End 471 is conveniently regarded as the first longitudinal end, with end 472 then becoming the associated second longitudinal end.
  • First end 471 can be seen to be disposed toward the first end plate 460, with second end 472 being consequentially disposed toward the second end plate 455.
  • the thermally-nonresponsive portion of the differential assembly can be seen to be implemented in two sections.
  • the first is a thermally-invariant bar 480 having opposite first and second ends 481 and 482.
  • the second is a yoke 490 having opposite first and second ends 491 and 492.
  • first end 481 being secured to first longitudinal end 471 and with opposite end 482 being secured to end plate 455, first end 471 is held as required in thermally-invariant relationship with the second end plate 455.
  • first end 491 of thermally-invariant yoke 490 being secured to the first end plate 460 and with opposite yoke end 492 being secured to second longitudinal end 472, end 472 is held as required in thermally-invariant relationship with the first end plate 460.
  • thermal variations in element 473 produce a relative motion of first end plate 460 with respect to second end plate 455, with the resulting variation in the characteristic longitudinal extent of cavity 410 being absorbed as required by the current-null segmentation 405. It is further consequentially apparent that the differential nature of this configuration causes a contraction in cavity characteristic length when ambient thermal variations otherwise produce an expansion in thermally-sensitive element 473. A cavity expansion under circumstances of element-473 contraction is produced otherwise.
  • the illustrated resonator 400 possesses no special mechanism for counteracting thermally-induced variations in the transverse geometry of cavity 410. There would thus tend to be a direct, rather than inverse, variational relationship between changes in ambient temperature and net changes in the subject transverse geometry. It is therefore finally apparent that because the otherwise unrestrained thermally-induced direct variations in the transverse geometry of cavity 410 may be offset by appropriately-adjusted thermally-induced inverse variations in the cavity's longitudinal extent which are brought about by means of the differential expansion mechanism 470, the desired characteristic compensation for the overall resonator can be achieved through the resulting inversely-proportional relationship.
  • complementary portions 473a and 473b of the thermally-responsive element may be implemented by means of a cylinder assembly.
  • a closed end of the cylinder could be employed as the first longitudinal end 471 of the thermally-responsive element 473, in which case element ends 471a and 471b would together make up respective portions of the cylinder bottom.
  • the associated opposite end of the cylinder would in an analogous fashion become the second longitudinal end 472 of the thermally-responsive element 473 and would in turn include end portions 472a and 472b.
  • yoke 490 could also be implemented by means of a thermally-invariant cylinder assembly having a closed end which could be employed as a first cylinder end which is to be disposed toward and secured to first end plate 465.
  • this first cylinder end would encompass illustrated yoke end 491.
  • Such a cylinder would inherently possess an opposite second end which in this situation would coincide with yoke end 492, would be disposed toward second end plate 455 and would be secured to the second longitudinal end 472 of the thermally-responsive cylinder assembly previously described.
  • the thermally-invariant bar 480 could then be regarded as having its first end 481 secured to the cylinder portions 471 a and 471 b and as having its opposite, second end 482 secured to the second end plate 455.
  • the unitary element 473 of Figure 4 may with appropriate modifications to yoke 490 be expanded into a multiple-stage assembly such as the example mechanism 570 illustrated in Figure 5.
  • example mechanism 570 it may also be noted parenthetically that three such units peripherally-spaced at 120° intervals would again typically be employed to provide parallel-plate compensation for a typical cylindrical resonator. It may be further noted that the general associated cavity could be the same as those presented in the previous figures. Accordingly, only those cavity wall portions 555 and 560 which are adjacent to the end-plate mechanism will be included in the discussion here.
  • thermally-invariant bar assembly 580 in conjunction with thermally-invariant yoke assembly 590. Both of these assemblies correspond to the analogous elements in Figure 4 and hence will not be further discussed. It will also become apparent that because the adjustment components below bar assembly 580 correspond to those above and because these lower components may be taken as forming in a specific embodiment complementary portions of cylinder assemblies which may be utilized to specifically implement the additively-configured mechanism to be described below, these components will likewise not be further discussed in the present portion of the specification.
  • this embodiment may in general terms be regarded as including a plurality of additively-configured, paired first and second thermally-responsive sub-elements.
  • the plurality is seen to consist of a single pair of sub-elements, these being sub-elements 574 and 577.
  • Each of these sub-elements is seen to possess, with respect to the resonator disposed out of the field of view, longitudinal extent terminating in opposite first and second intermediate ends.
  • the first intermediate end of sub-element 574 is portion 575, while the second intermediate end of the same sub-element is portion 576.
  • the first intermediate end 575 is seen to be disposed toward first end plate 560, with second intermediate end 576 being analogously disposed toward second end plate 555.
  • Sub-element 577 similarly possesses respective first and second intermediate ends 578 and 579 themselves respectively disposed toward first and second end plates 560 and 555.
  • each sub-element pair as having a first pair member and a second pair member.
  • sub-element 574 may be regarded as the first member of the pair, with sub-element 577 then becoming the associated second member of the pair.
  • each plurality of paired sub-elements as having a first plurality member and a last plurality member.
  • first plurality member becomes the same as the first pair member 574 and the last plurality member consequentially becomes the same as the second pair member 577.
  • member attached to bar assembly 580 would be the associated first plurality member while the final pair member attached to yoke assembly 590 would become the analogously-associated last plurality member.
  • first intermediate end 575 of the first pair member 574 may thus be taken as corresponding to the first end 471a a of the thermally-responsive element 473 of the unitary configuration in Figure 4.
  • second intermediate end 579 of the second pair member 577 may be regarded as corresponding to the second end 472a of the element 473.
  • a generally-configured, thermally-responsive, multiple differential assembly would include a plurality of thermally-nonresponsive sub-mechanisms, one for each pair of thermally-responsive sub-elements, with each of these sub-mechanisms functioning to hold the second intermediate end of the associated first pair member in thermally-invariant relationship with the first intermediate end of the associated second pair member.
  • extension 585 serves in the role of the thermally-nonresponsive sub-mechanism and accordingly holds second intermediate end 576 of first pair member 574 in thermally-invariant relationship with the first intermediate end 578 of the associated second pair member 577.
  • Figure 6 illustrates an arrangement which may be utilized in conjunction with the previously-described characteristic-compensation devices to provide the resonator's overall thermal-compensation mechanism with the additional capability of counteracting thermally-induced variations in the transverse geometry of the resonator.
  • resonator 600 may be more-specifically described as including cavity 610 which is configured such that applied microwave energy is channeled along a propagational axis 650, with cavity 610 possessing in relation to axis 650 both characteristic longitudinal geometry and characteristic transverse geometry.
  • cavity 610 possessing in relation to axis 650 both characteristic longitudinal geometry and characteristic transverse geometry.
  • the overall thermal-compensation mechanism for the resonator 600 may include the illustrated thermally-nonresponsive, transverse-stabilization element 670 whose function is to inhibit thermally-induced variations in the resonator's characteristic transverse geometry.
  • the transverse-stabilization mechanism 670 may be more-specifically described as including a plurality of thermally-nonresponsive side-wall segments.
  • the illustrated cavity of Figure 6 includes the one such segment 670.
  • a given segment would typically be configured as a longitudinally- extending component of the side walls 665 and would typically possess a characteristic transverse configuration the same as that of the side walls.
  • each such segment terminates in opposite first and second ends, ends 671 and 672 as illustrated, and each of the segment ends includes a current-null segmentation, which in the illustrated situation are represented by segmentations 605 and 607.
  • stabilization mechanism 670 it becomes convenient to configure stabilization mechanism 670 as simply a composite ring of a suitable thermally-nonresponsive material such as a graphite composite. By being invariant to ambient temperature fluctuations and by thus providing for a measure of diameter constraint for the overall resonator 600, this graphite ring contributes to the achievement of a degree of thermal compensation and hence a corresponding degree of frequency stabilization.
  • the transverse-stabilization element 670 is likewise preferably mounted exterior to the cavity 610 in the sense that element 670 does not protrude into the cavity in a manner which could otherwise once more have an adverse impact on operational characteristics.
  • This non-operationally protruding configuration again enables the cavity to be free from internal obstructions other than the desired tuning elements described below.
  • the illustrated situation of Figure 6 differs from the previously-described embodiments in that it contains two current-null segmentations.
  • Those skilled in the art will recognize that the presence of more than one segmentation is not inconsistent with the requirement that such segmentations be located at current nulls. Because a typical stabilization ring would be rather narrow and because a given null may more-generally be regarded as merely a specific portion of a relatively-wider region of decreased current intensity, the segmentation ends of a given ring could still be expected to be within the low-current region and in this sense satisfy the null-location requirement.
  • a resonator could be designed so as to include several nulls along its characteristic length. It would then be possible, where convenient with respect to alternative configurations in which the resonator generally possessed a plurality of segmentations, to locate the different segmentations at separate ones of these plural nulls.
  • an important aim of the present invention is to enable the power-handling capability of microwave resonators to be significantly increased.
  • the various above-described forms of the compensation mechanism operate to counteract the thermally-induced dimensional variations which in the past have typically been an unavoidable consequence of any attempt to fabricate the subject resonators from materials with high coefficients of thermal conductivity, the various mechanisms enable the previously-stated aims of the invention to be realized.
  • materials such as aluminum, magnesium and zinc have dimensional characteristics which are very temperature-sensitive, the present invention enables these highly-thermally-conductive materials to be employed for microwave, narrow-band tuned elements.
  • the current-null segmentation of the present invention typically takes the form of a cavity-wall separation, at which point a flexible or slip joint may be employed to serve as the cross-segmentation connection mechanism for the associated portions of the cavity walls.
  • a flexible or slip joint may be employed to serve as the cross-segmentation connection mechanism for the associated portions of the cavity walls.
  • a variety of conventional mechanisms may be utilized to provide this sealing capability. It may be noted that certain kinds of flexible or slip joints may inherently provide a certain degree of such sealing capability.
  • the segmentation apertures of the previously-presented configurations may accordingly be regarded as possessing suitable sealing expedients.
  • Microwave resonators typically include tuning elements such as conventional screws which are adjustably inserted into appropriate portions of the microwave cavity.
  • the cavity-tuning elements utilized for the thermally-compensated cavities of the present invention be formed from thermally-nonresponsive material such as Invar.
  • thermally-nonresponsive tuning elements appear as elements 102, 103 and 104 of Figures 1 and 2, element 302 of Figure 3, element 402 of Figure 4 and element 602 of Figure 6.
  • tuning element 602 is more-specifically regardable as a transverse cavity-tuning element in that the one element illustrated is carried on the transverse-stabilization ring 670 between the ring's associated current-null segmentations 605 and 607.
  • the tuning devices thus appear as elements 172 and 177 for the associated characteristic-compensation devices 170 and 175 in Figure 1, as element 340 for compensation unit 370 in Figure 3, as element 440 for compensation unit 470 in Figure 4 and as element 540 for compensation unit 570 in Figure 5.
  • tuning devices can be seen to include in turn an appropriate conventional combination of a screw and adjustment-nut assembly which, in accordance with the intent of the present invention, is advantageously formed from a thermally-nonresponsive material, once again such as Invar.
  • characteristic longitudinal tuning for the device of Figure 3 can be accomplished by adjusting nut 342 on screw 344 and may analogously be accomplished for the resonator of Figure 4 by adjusting nut 442 and nut 443, both on screw 444.
  • an inventively- configured coaxial resonator would typically employ a center conductor formed from a thermally-invariant material.
  • the resonant frequency of a cylindrical resonator having diameter D and length L and operating in the TE 111 mode is given by
  • the temperature variation experienced by microwave hardware in communication spacecraft typically ranges over a ⁇ 50°F interval ( ⁇ 28°C).
  • the associated induced change in resonator dimensions is given by the equations where D' and L' are the new diameter and length when the expansion coefficient of the material is a and the temperature change is ⁇ T.
  • the composite expansion coefficient a becomes 2x(10) -6 in/in/°F (3.6x10 -6 mm/mm/°C).
  • a 50°F (27.8°C) temperature change would accordingly induce in this Invar resonator the new dimensions of
  • Equation 10 By again comparing with Equation 10, this can be seen to be a still-greater improvement in stability compared to an all-aluminum resonator. By comparison also with Equation 7, this can further be seen to represent an improvement even over an all-Invar resonator.
  • the resonant frequency is given by where A and L are the resonator width and length in inches. If for a typical resonator (19.05 mm and 15.24 mm respectively) the resonant frequency then becomes
  • low-expansion element "A” With a rise in temperature, the effectively-unrestrained right end of low-expansion element "A” will move one unit to the right, with attached high-expansion element “B” expanding 16 units to the left. Similarly, low-expansion element “C” will move one unit to the right, and high-expansion element “D” will move 16 units to the left. The right end of low-expansion element “E” will similarly move one unit to the right.

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Claims (10)

1. Ein Mikrowellenresonator mit
einer Mikrowellenresonanzkammer (410, 610), welche eine longitudinale Stromnullstelle aufweist, wobei die Resonanzkammer am Ort der Stromnullstelle querlaufend segmentiert ist in erste und zweite longitudinale Sektionen, um eine relative longitudinale Bewegung zwischen den ersten und zweiten longitudinalen Sektionen zu erlauben und
longitudinal voneinander getrennten ersten (455) und zweiten (460) Platten, welche an der Resonanzkammer an den Enden der ersten und zweiten longitudinalen Sektionen entgegengesetzt der querlaufenden Segmentation befestigt sind, gekennzeichnet durch

eine thermisch empfindliche erste Kompensationsanordnung (470, 570, 670), welche an den ersten und zweiten Platten befestigt ist;
wobei die erste Kompensationsanordnung einen effektiven negativen Koeffizienten thermischer Ausdehnung aufweist, um eine temperaturabhängige Variation des longitudinalen Abstands zwischen den ersten und zweiten Platten vorzusehen;
wodurch die Veränderungen der Resonanzfrequenz des Resonators, welche von thermisch herbeigeführten Variationen der querlaufenden Ausdehnungen der Resonanzkammer herrühren, im wesentlichen durch die temperaturabhängige Variation in dem longitudinalen Abstand der ersten und zweiten Platten ausgeglichen werden.
2. Der Resonator nach Anspruch 1, worin die erste Kompensationsanordnung eine Mehrzahl von im wesentlichen ausgedehnten Bauteilen (480, 473, 490, 580, 574, 577, 590) aufweist, welche zwischen den ersten und zweiten Platten longitudinal angeordnet sind.
3. Der Resonator nach Anspruch 2, worin jeder der ausgedehnten Bauteile der ersten Kompensationsanordnung aufweist:
ein erstes, thermisch invariantes Bauteil (480, 580), wobei das erste Bauteil ein erstes (482) Teil aufweist, welches an der ersten Platte befestigt ist;
ein zweites, thermisch empfindliches Bauteil (473, 574, 577), wobei das zweite Bauteil ein erstes Teil (471, 575) aufweist, weiches an einem zweiten Teil (481, 580) des ersten Bauteils befestigt ist, wobei die ersten und zweiten Teile des ersten Bauteils longitudinal von einander getrennt sind; und
ein drittes, thermisch invariantes Bauteil (490, 590), wobei das dritte Bauteil ein erstes Teil (492) aufweist, welches an einem zweiten Teil (472, 579) des zweiten Bauteils befestigt ist, wobei die ersten und zweiten Teile des zweiten Bauteils longitudinal voneinander getrennt sind, wobei das dritte Bauteil ein zweites Teil (491) aufweist, welches an der zweiten Platte befestigt ist, wobei die ersten und zweiten Teile des dritten Bauteils longitudinal voneinander getrennt sind.
4. Der Resonator nach Anspruch 3, worin das zweite Teil des ersten Bauteils und das erste Teil des zweiten Bauteils longitudinal von der zweiten Platte getrennt sind.
5. Der Resonator nach den Ansprüchen 3 oder 4, worin das dritte Bauteil ein im wesentlichen ausgedehntes Joch definiert, wobei das erste und zweite Bauteil im wesentlichen innerhalb des Joches angeordnet ist; und
wobei das erste Bauteil im wesentlichen innerhalb des zweiten Bauteils angeordnet ist.
6. Der Resonator nach den Ansprüchen 3, 4 oder 5, worin das Material der ersten und dritten Ausdehnungsbauteile Invar ist.
7. Der Resonator nach den Ansprüchen 3, 4, 5 oder 6, worin das Material des zweiten Ausdehnungsbauteils Aluminium ist.
8. Der Resonator nach den Ansprüchen 3, 4, 5, oder 6, worin das Material des zweiten Ausdehnungsbauteils Magnesium ist.
9. Der Resonator nach einem der vorhergehenden Ansprüche, worin die Mikrowellenresonatorkammer einen im wesentlichen zylindrisch querlaufenden Durchschnitt aufweist.
10. Ein Mikrowellenresonator nach einem der vorhergehenden Ansprüche, welcher des weiteren aufweist:
eine longitudinale Lücke zwischen den ersten und zweiten longitudinalen Abschnitten der Mikrowellenresonatorkammer;
ein Abstimmbauteil (402,602), welches ein Teil aufweist, das sich in die Lücke in der Resonanzkammer erstreckt und angepaßt ist, um eine Resonanzfrequenz der Mikrowellenresonanzkammer abzugleichen sowie sich das Teil des Abstimmbauteils in die Mikrowellenresonanzkammer oder aus ihr heraus bewegt; und
eine thermisch invariante Vorrichtung (670), welche im wesentlichen benachbart zu der longitudinalen Lücke positioniert ist und ein Teil der Resonanzkammer umgibt zur Stützung des Abstimmbauteils und zur wesentlichen Unterdrückung von Veränderungen in der Resonanzfrequenz der Mikrowellenresonanzkammer, herrührend von thermisch herbeigeführten Veränderungen in querlaufenden Ausdehnungen der Mikrowellenresonanzkammer.
EP19840903381 1983-06-30 1984-06-04 Temperaturkompensierter mikrowellenresonator mit einem spalt veränderlicher breite an einer stromnullstelle Expired EP0155296B1 (de)

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US50957283A 1983-06-30 1983-06-30
US509572 1983-06-30

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EP0155296A1 EP0155296A1 (de) 1985-09-25
EP0155296B1 true EP0155296B1 (de) 1990-03-07

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EP19840903381 Expired EP0155296B1 (de) 1983-06-30 1984-06-04 Temperaturkompensierter mikrowellenresonator mit einem spalt veränderlicher breite an einer stromnullstelle

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EP (1) EP0155296B1 (de)
JP (1) JPS60501736A (de)
AU (1) AU577064B2 (de)
CA (1) CA1219046A (de)
DE (1) DE3481572D1 (de)
WO (1) WO1985000698A1 (de)

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DE19620594A1 (de) * 1996-05-22 1997-11-27 Sel Alcatel Ag Resonator für elektromagnetische Wellen mit einer Stabilisierungseinrichtung und Verfahren zum Stabilisieren der Resonatorlänge

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SE439078B (sv) * 1984-07-17 1985-05-28 Philips Norden Ab Anordning vid en avstembar magnetron

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Also Published As

Publication number Publication date
CA1219046A (en) 1987-03-10
AU577064B2 (en) 1988-09-15
WO1985000698A1 (en) 1985-02-14
EP0155296A1 (de) 1985-09-25
JPS60501736A (ja) 1985-10-11
AU3430284A (en) 1985-03-04
DE3481572D1 (de) 1990-04-12

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