EP2978066A1 - Kit de montage pour coupler un joint de guide d'ondes à un guide d'ondes - Google Patents

Kit de montage pour coupler un joint de guide d'ondes à un guide d'ondes Download PDF

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Publication number
EP2978066A1
EP2978066A1 EP15177854.5A EP15177854A EP2978066A1 EP 2978066 A1 EP2978066 A1 EP 2978066A1 EP 15177854 A EP15177854 A EP 15177854A EP 2978066 A1 EP2978066 A1 EP 2978066A1
Authority
EP
European Patent Office
Prior art keywords
waveguide
coupling
elements
interconnection
guide
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Withdrawn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
EP15177854.5A
Other languages
German (de)
English (en)
Inventor
Elio Melillo
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.)
MBDA Italia SpA
Original Assignee
MBDA Italia SpA
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 MBDA Italia SpA filed Critical MBDA Italia SpA
Publication of EP2978066A1 publication Critical patent/EP2978066A1/fr
Withdrawn legal-status Critical Current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
    • H01P1/04—Fixed joints
    • H01P1/042—Hollow waveguide joints

Definitions

  • This description relates to the technical field of waveguides for the transmission of electromagnetic waves, such as electromagnetic waves in radio frequency (RF). More particularly, this description relates to a mounting kit for coupling a gasket for a waveguide to a waveguide.
  • RF radio frequency
  • the radar guidance system normally includes a radar antenna suitable to capture a signal emitted or reflected from the target to hit.
  • the above-mentioned radar guidance system further comprises a transmitter connected to the radar antenna through a waveguide path.
  • the transmitter is suitable to receive a signal from the antenna and, on the basis of this signal, transmits control signals to the various control devices of the missile in such a way as to enable the missile to track the target to hit or, in any case, to correct the related trajectory to the target.
  • the path in the waveguide interposed between the antenna and the transmitter normally comprises a waveguide connected to the transmitter (transmitter-side waveguide) and a waveguide connected to the antenna (antenna-side waveguide).
  • the transmitter-side waveguide has a respective interconnection portion (transmitter-side interconnection portion).
  • the antenna-side waveguide has a respective interconnection portion (antenna-side interconnection portion).
  • the antenna-side and transmitter-side waveguides are fixed together by means of a pair of locking screws that pass through the through-holes of the antenna-side interconnection portion and are screwed into the threaded holes of the transmitter-side interconnection portion.
  • a waveguide gasket having the purpose of limiting, or substantially eliminating, power losses of the electromagnetic signal which passes through the waveguide path under the operating conditions of the missile.
  • This gasket is normally a plate-shaped gasket that has an adhesive face and an opposite non-adhesive face.
  • the gasket is manually fixed by an operator to the transmitter-side interconnection portion.
  • the operator couples the adhesive face of the gasket to the transmitter-side interconnection in such a way as to glue to the gasket to the transmitter-side waveguide.
  • the antenna-side interconnection portion is fixed by means of said locking screws to the transmitter-side interconnection portion in such a way that the waveguide gasket is interposed between said interconnection portions.
  • the method of coupling of the waveguide gasket to the transmitter-side waveguide and the method of interconnection between the transmitter-side waveguide and the antenna-side waveguide described above have certain drawbacks.
  • the method of coupling the waveguide gasket described above determines an imprecise positioning of the waveguide gasket. Such imprecise positioning of the gasket can cause a burning of the gasket or, in any case, a burning inside the waveguide path under the operating conditions of the missile.
  • the gasket once the gasket has been positioned and glued inaccurately, it can no longer be repositioned or reused. Therefore, if during the step of coupling the gasket, the operator realises that the gasket was positioned inaccurately, he is forced to replace the previously glued gasket with a new gasket.
  • one drawback is due to the fact that alignment between these waveguides is made directly by means of locking screws.
  • the locking screws inserted into the through-holes of the antenna-side interconnection portion (which are not yet perfectly aligned with the threaded holes of the transmitter-side interconnection portion) accidentally come into contact with the gasket glued to the transmitter-side interconnection portion. This can cause damage or a partial separation or displacement of the gasket.
  • a general purpose of this description is to make available a mounting kit for coupling a waveguide gasket to a waveguide that is able to solve or eliminate, at least partly, the drawbacks described above with reference to the known art.
  • Fig. 1 shows a mounting kit according to a currently preferred embodiment, which is globally indicated by the reference number 1.
  • the mounting kit 1 allows coupling a waveguide gasket 2 to a first waveguide 3.
  • the gasket 2 is suitable to be arranged along a waveguide path and has the purpose of limiting, or substantially eliminating, the power losses of an electromagnetic signal that passes through the waveguide path.
  • the gasket 2 is a plate-shaped gasket that has an adhesive face 2A and an opposite non-adhesive face 2B (the non-adhesive face 2B is shown, for example, in Fig. 14 ).
  • the adhesive face 2A is preferably covered by a film (not shown) intended to be removed before coupling the gasket 2 to the waveguide 3.
  • the gasket 2 is provided with gasket through-openings 2C, preferably a pair of gasket through-openings 2C, more preferably two gasket holes 2C.
  • the first waveguide 3 is associated with a first apparatus 4.
  • the apparatus 4 is a transmitter 4 and, more preferably, it is a transmitter of a missile.
  • the first waveguide 3 comprises an interconnecting portion 5 that is provided with first interconnection elements 6.
  • the first interconnection elements 6 preferably comprise a first and a second threaded hole 6.
  • the interconnecting elements 6 are provided for connecting the first waveguide 3 to a second waveguide 7 ( Fig. 17 ).
  • the second waveguide 7 is associated to a second apparatus 8.
  • the apparatus 8 is an antenna 8 and, more preferably, it is an antenna of a missile.
  • the second waveguide 7 comprises a second interconnection portion 9 for connecting the second waveguide 7 to the first waveguide 3.
  • the second interconnection portion 9 is provided with second interconnection elements 10.
  • the second interconnection elements 10 comprise a first and a second interconnection through-opening 10 and, more preferably, a first and a second interconnection hole 10 is not threaded.
  • the first waveguide 3 and the second waveguide 7 will be referred to respectively as “transmitter waveguide” and “antenna waveguide”.
  • the mounting kit 1 comprises a positioning member 11, preferably a positioning plate 11, including a holding element 12 that is configured to removably retain the gasket 2.
  • the holding element 12 comprises a holding portion 12 or retention edge 12 defining a housing recess 13 configured to receive the waveguide gasket 2. More particularly, retention edge 12 is counter-shaped with respect to the gasket 2.
  • the mounting kit 1 further comprises first guide elements 14 that are configured to be removably coupled to the interconnection elements 6 of the transmitter waveguide.
  • the positioning member 11 comprises second conjugated guide elements 16 that are configured to cooperate with the first guide elements 14 so as to slidably couple the positioning member 11 and the first guide elements 14.
  • the second conjugated guide elements 16 are configured to cooperate with the first guide elements 14 so as to slidably couple the positioning member 11 and the first guide elements 14 along a sliding direction.
  • the positioning member 11 comprises a front face 11A in which is provided the holding element 12 and the sliding direction is orthogonal to a sliding direction with respect to said front face 11A.
  • first guide elements 14 comprise a first and a second guide pin 14 and the second conjugated guide elements 16 comprise a first and a second guide through-opening 16 through which said first and second guide pin 14, respectively, can be removably inserted.
  • the first and the second guide pin 14 allow slidingly guiding the positioning member 11 along the said sliding direction, i.e., along the first and second guide pin 14.
  • the first and second guide pin 14 are equal to each other.
  • each pin 14 has a length generally between 40 mm and 50mm, extremes included, and more preferably has a length of about 40 mm.
  • the first and second guide pin 14 respectively comprise a first and a second threaded end portion 18 provided for coupling each pin 14 with a respective threaded hole 6 of the interconnection portion of the transmitter waveguide.
  • the housing recess 13 of the positioning member 11 has a generally quadrangular conformation and the guide through-openings 16 are located at two angles of the housing recess which are aligned or substantially aligned along a diagonal of the housing recess.
  • the housing recess 13 has a generally parallelogram shape, and the guide through-openings 16 are substantially aligned along a diagonal of that parallelogram.
  • Fig. 12 the plate 11 and the gasket 2 are shown in a configuration of almost complete coupling. In reality, when the gasket 2 is completely received in the recess 13, the adhesive face 2A of the gasket is flush or substantially flush with the front face 11A of the plate 11. In other words, preferably the depth of the housing recess 13 substantially corresponds to the thickness of the gasket 2.
  • the mounting kit 1 comprises a first extraction bush 19 couplable to the first guide pin 14.
  • the first guide pin 14 comprises a first coupling portion 20 and the first bush 19 comprises a first conjugated coupling portion 21.
  • the first conjugated coupling portion 21 is a hollow portion configured to receive, at least partially and removably, the coupling portion 20 of the first guide pin.
  • the conjugated coupling portion 21 of the bush 19 is counter-shaped with respect to the coupling portion 20 of the first guide pin 14 in such a way as to make the bush 19 and the guide pin 14 integral in rotation with each other when the bush 19 and the guide pin 14 are coupled together.
  • the bush 19 is a hexagonal profile bush. Figs.
  • each guide pin 14 preferably has a calibrated portion 14A having a larger cross-section than the coupling portion 20.
  • the calibrated portion 14A is counter-shaped with respect to the holes 6 of the interconnection portion 5 and preferably has a tolerance of two hundredths of a millimetre with respect to the holes 6.
  • each pin 14 has a tapered tip 14C having a rounded-tip end 14D.
  • the tapered tip 14C has a generally conical shape.
  • the mounting kit 1 comprises a first tool 22 having an actuation tip 23.
  • the first extraction bush 19 is provided, on a respective side wall 24, with at least one conjugated actuation opening 25 that is configured to cooperate with the actuation tip 23.
  • the actuation tip 23 is removably couplable to the above-mentioned at least one conjugated actuation opening 25.
  • the bush 19 is provided with a plurality of openings 25, for example six openings 25.
  • Fig. 7 which shows the tool 22 partially in section, one can see that the tip 23, is preferably a cylindrically-shaped tip 23.
  • This cylindrical tip 23 is preferably coupled by means of a forced coupling, such as a cold-forced coupling, to a hollow end portion 23A of a main body 22A of the tool 22.
  • a forced coupling such as a cold-forced coupling
  • the main body 22A is made of stainless steel while the tip 23 is made of hardened steel.
  • the mounting kit 1 comprises a second extraction bush 26 couplable to the second guide pin 14.
  • the bush 26 is a knurled bush.
  • the second guide pin 14 comprises a second coupling portion 20 and the extraction bush 26 comprises a second conjugated coupling portion 27.
  • the coupling portion 20 of the second guide pin and the coupling portion 20 of the first guide pin are equal to each other.
  • the second conjugated coupling portion 27 of the bush 26 is a hollow portion configured to receive at least partially and in a removable manner the coupling portion 20 of the second guide pin.
  • the conjugated coupling portion 27 is counter-shaped with respect to the coupling portion 20 of the second guide pin 14 in such a way as to make the extraction bush 26 and such guide pin 14 integral in rotation with each other when the extraction bush 26 and the guide pin 14 are coupled together.
  • the extraction bush 26 also comprises a third coupling portion 28, opposite to the second conjugated coupling portion 27, which is configured to be coupled to a second tool T ( Fig. 17 ).
  • the conjugated coupling portion 27 has a circular-segment inner profile 27A, while the third coupling portion 28 has a polygonal inner profile 28A, such as, for example, a hexagonal inner profile 28A.
  • the tool T is a tool of a different type with respect to the tool 22.
  • the tool T is a tool having a polygonal-profile head H ( Fig. 17 ), for example with a hexagonal profile.
  • the gasket 2 is initially inserted in the housing recess 13 of the plate 11 with the respective non-adhesive face 2B facing the plate 11.
  • the holes 2C of the gasket are aligned with the guide holes 16 of the positioning plate 11.
  • the pins 14 are fixed to the interconnection portion 5 of the transmitter waveguide by screwing the threaded portions 18 in the threaded holes 6, as shown for example in Fig. 11 .
  • the plate 11, with the gasket 2 coupled to it, is then coupled to the pins 14 through the guide holes 16.
  • Fig. 14 shows the plate 11, preferably held between two fingers D1, D2, during this step of removal from the interconnecting portion 5.
  • Fig. 14 shows the gasket 2 glued to the interconnection portion 5.
  • the transmitter waveguide is placed against an interconnection opening O1 provided on an interconnection wall W1.
  • the wall W1 is a wall of a support base B1 of the antenna 8.
  • the transmitter waveguide and the respective interconnection portion 5 are not visible as they are located on the opposite side of the wall W1 with respect to the side of said wall W1 shown in Fig. 15 .
  • the interconnection portion 5 is disposed in such a way that the guide pins 14 protrude from a face 30 of the wall W1.
  • the interconnection portion 9 of the antenna waveguide can be coupled to the transmitter waveguide 3 by passing the pins 14 through the holes 10.
  • the interconnection portion 9 is made to slide along the pins 14 until a projecting annular edge 31 or flange 31 of the interconnection portion 9 abuts against the wall W1.
  • a projecting central portion (not shown in the figures) of the interconnection portion 9 is facing and preferably passes through the opening O1 so as to contact the second gasket 2 coupled to the interconnection portion 5.
  • the projecting central portion of the interconnection portion 9 is preferably a portion substantially equal to the interconnection portion 5 of the transmitter waveguide.
  • the non-threaded-holes 10 extend through the projecting portion of the interconnection portion 9.
  • the first extraction bush 19 is, for example, initially coupled to the portion 20 of one of the pins 14.
  • the bush 19 is coupled to the pin 14 that is closer to a peripheral edge 32 of the wall W1. The bush 19 is then rotated so as to unscrew the pin 14 coupled to it from the respective hole 6.
  • the bush 19 is preferably rotated by means of the tool 22 by inserting the tip 23 of such tool into the holes 25 provided on the bush 19. Once unscrewed, the pin 14 is then extracted and replaced by a locking screw (not shown), which is inserted through a hole 10 of the interconnection portion 9, a hole 2C of the gasket 2 and finally screwed into a hole 6 of the interconnection portion 5.
  • a locking screw not shown
  • the bush 19 and the tool 22 it is possible to unscrew the pin 14 coupled to the bush 19 in the case in which the working space in a direction orthogonal to the wall W1 is particularly limited, for example due to the presence of an obstacle, such as, for example a portion of the antenna waveguide 7.
  • the bush 19 may, in general, also be driven by a spanner.
  • the tool 22 it is advantageously possible to avoid or reduce possible impacts of the tool with the antenna waveguide that could partially damage said waveguide.
  • Fig. 17 shows an extraction step of the pins 14 in which the pin 14 coupled to the bush 26 is the first of the pins 14 to be removed instead of being the second pin 14 to be removed. For this reason, Fig. 17 also shows the pin 14 that is not coupled to the bush 26. In other words, based on what is described above, Fig. 17 should show a locking screw in place of the pin 14 shown in this figure.
  • This coupling method includes:
  • the above coupling method also comprises:
  • the above coupling process further comprises a step of fixing the second waveguide 7 to the first waveguide 3, where the fixing step includes:
  • the first guide elements 14 comprise a first and a second guide pin 14, the first interconnection elements 6 comprise a first and a second threaded hole 6, the second interconnection elements comprise a first and a second interconnection through-opening 10, and the locking elements comprise a first and a second locking screw suitable to be screwed into said first and second threaded hole 6, respectively.
  • the operation of uncoupling the guide pins 14 comprises:
  • the operation of uncoupling the guide pins 14 comprises:
  • a mounting kit allows achieving the purposes mentioned above with reference to the state of the prior art. Thanks to the fact of providing a positioning member configured to removably hold the waveguide gasket and the guide elements to which can be slidingly coupled the positioning member, where these guide elements are configured to be removably coupled to interconnection elements provided on an interconnection portion of a first waveguide, it is, in fact, possible to accurately glue a waveguide gasket in the predetermined position avoiding the positioning errors of the gasket discussed above with reference to prior art. This advantageously allows both to avoiding, or at least significantly reducing the probability, that the gasket may be burned due to incorrect positioning and, in general, improving the transmission performance of the waveguide path.
  • a mounting kit according to this description advantageously allows substantially eliminating the costs of the known art related to the need to discard gaskets that were not glued in the correct position and that cannot be reused.
  • a mounting kit according to this description also allows precisely aligning a pair of waveguides avoiding that, during the coupling procedure of the waveguides, the locking screws damage or cause a disconnection or displacement of the waveguide gasket once it has been glued to the respective waveguide.

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EP15177854.5A 2014-07-22 2015-07-22 Kit de montage pour coupler un joint de guide d'ondes à un guide d'ondes Withdrawn EP2978066A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRM20140412 2014-07-22

Publications (1)

Publication Number Publication Date
EP2978066A1 true EP2978066A1 (fr) 2016-01-27

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Family Applications (1)

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EP15177854.5A Withdrawn EP2978066A1 (fr) 2014-07-22 2015-07-22 Kit de montage pour coupler un joint de guide d'ondes à un guide d'ondes

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EP (1) EP2978066A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052045A (en) * 1976-07-29 1977-10-04 Billy Joe Shaddix Alignment of flanges
EP1331686A2 (fr) * 2002-01-24 2003-07-30 Andrew AG Assemblage adapteur et procédé associé
US20050285702A1 (en) * 2004-06-25 2005-12-29 Andrew Corporation Universal waveguide interface adaptor
WO2008002507A2 (fr) * 2006-06-27 2008-01-03 Datapath, Inc. Dispositif de blocage à ouverture rapide pour guide d'onde

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052045A (en) * 1976-07-29 1977-10-04 Billy Joe Shaddix Alignment of flanges
EP1331686A2 (fr) * 2002-01-24 2003-07-30 Andrew AG Assemblage adapteur et procédé associé
US20050285702A1 (en) * 2004-06-25 2005-12-29 Andrew Corporation Universal waveguide interface adaptor
WO2008002507A2 (fr) * 2006-06-27 2008-01-03 Datapath, Inc. Dispositif de blocage à ouverture rapide pour guide d'onde

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