Description:FORM 2

THE PATENTS ACT, 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
[SEE SECTION 10, RULE 13]

A COUPLING SYSTEM;
BY
M/S BHARAT ELECTRONICS LIMITED
WITH ADDRESS:
OUTER RING ROAD, NAGAVARA, BANGALORE 560045, INDIA

THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED

TECHNICAL FIELD
[001] The present invention relates to microwave and radio frequency devices more particularly to a coupling system for a direct right angle mechanical engagement of a waveguide to a printed circuitry to establish a waveguide interface for external connection.
BACKGROUND
[002] Generally, in conventional modular/stand-alone type of radiofrequency or microwave subsystems used in applications such as front-end receivers, power amplifiers, up converters and down converters, a waveguide is one among the possible interfaces for coupling with other subsystems/modules. Such conventional waveguide interfaces use coax-based transitions which enable transmission of radiofrequency energy. The waveguide transitions have provisions to couple energy between a printed circuitry at one end and mate an external waveguide flange at another end. It is a known fact that minimum possible interconnections improve efficiency of energy transmission. However, the conventional coupling systems commonly employ a micro strip to waveguide transition via commercially available coax connectors / conductors and cables in between for coupling the printed circuitry and the waveguide. Such conventional coupling systems not only lead to increased number of interconnections but also results in bulky system design. In addition, adaptor plates would be necessary for enabling waveguide interface for external connection. The problems of waveguide transition in such conventional systems may be possibly overcome to an extent by a direct right-angle transition or a direct inline transition. However, the direct inline transition may not be suitable for all application and mechanical coupling challenges limit the usage of right-angle transition for direct coupling of the printed circuitry and the waveguide. Further, limitations include the coax probe projecting out from an external side wall of the waveguide at right angle restricts straight mechanical engagement of waveguide and circuitry and obstructs fixing of waveguide flange to chassis at the same instance preventing direct waveguide interface for external waveguide of other modules.
[003] Therefore, there is a need to provide a coupling system to overcome one or more of the aforementioned problems.

SUMMARY
[004] Accordingly, an exemplary aspect of the present invention discloses a coupling system comprising: a waveguide having: a flange with a centrally located cut-out and a plurality of apertures on a front surface of the flange at a first end of said waveguide; a cantilever member extending away from a back surface of the flange at a second end of said waveguide co-axial to said cut-out, said cantilever member having at least a top wall face and at least a side wall face; a projection member extending at least along a length of a wall face of said cantilever member, said projection member is relieved by a groove abutting said back surface of the flange; and an aperture located on a surface of at least said side wall face of the cantilever member for receiving a coax probe projecting at a right angle to at least said side wall face; and a chassis having: an outer wall surface with a plurality of mounting apertures on a front surface at a first end; and a centrally located cut-out extending along a width of the outer wall surface relative to a length of said groove, said centrally located cut-out having a radial corner relief facing towards the receiving projection member while ensuring a single entry location for waveguide into chassis, said wall width along with the groove secure auto-aligning of said waveguide in a single sideward movement towards a printed circuitry board located within a recessed cross-sectional channel formed within the chassis.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
[005] The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:
[006] Figure 1 through Figures 1A-1D illustrates various views of a coupling system, according to an exemplary aspect of the invention, wherein
Figure 1A shows a front exploded isometric view of the coupling system, according to an exemplary embodiment of the present invention;
Figure 1B shows a rear exploded isometric view of the coupling system, according to the exemplary embodiment of the present invention;
Figure 1C shows an assembled isometric rear view of the coupling system, according to the exemplary embodiment of the present invention; and
Figure 1D shows an assembled isometric front view of the coupling system, according to the exemplary embodiment of the present invention;
[007] Figure 2 through Figures 2A-2B illustrates various views of a wave guide, according to the exemplary embodiment of the invention, wherein
Figure 2A shows an isometric view of a waveguide illustrating (I) a front side view and (II) a rear side view of the waveguide, according to the exemplary embodiment of the invention; and
Figure 2B shows an orthogonal projection view of the waveguide illustrating (I) rear view and (II) a side view of the waveguide, according to the exemplary embodiment of the invention;
[008] Figure 3 illustrates a front view of a chassis according to the exemplary embodiment of the invention; and
[009] Figure 4 through Figures 4A-4C illustrates various positions of the coupling system, according to the exemplary embodiment of the invention, wherein
Figure 4A shows the coupling system at a position A, according to the exemplary embodiment of the invention;
Figure 4B shows the coupling system at a position B, according to the exemplary embodiment of the invention; and
Figure 4C shows the coupling system at a position C, according to the exemplary embodiment of the invention.
[010] Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to the other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference signs are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION
[011] While this invention is susceptible of embodiments in many different forms, there is shown in the drawings and will herein be described in detail, a preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspects of the invention to the embodiment illustrated. Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. Embodiments of the present disclosure will now be described with reference to the accompanying drawings. Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to a person skilled in the art. Numerous details are set forth relating to specific components to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
[012] In general, the present invention claims, a coupling system comprising a waveguide having a flange with a centrally located cut-out, a cantilever member, a projection member extending at least along a length of a wall face relieving in a groove, a coax probe projecting at a right angle to at least a side wall face and a chassis with an outer wall surface having a centrally located cut-out with a radial corner relief facing towards the receiving projection member while ensuring a single entry location for waveguide into chassis, said groove and a width of the wall of the chassis in relation to groove secures auto-aligning of said waveguide in a single sideward movement towards a printed circuitry board located within a recessed cross-sectional channel formed within a side surface wall of the chassis.
[013] According to the embodiment of the present invention, the coupling system overcomes mechanical engagement challenges by providing a single assembly method of waveguide to the chassis while using direct right angle transition for engaging a waveguide to a printed circuitry directly via a coax at the same time offers a direct waveguide interface for coupling with external waveguides of other modules without the need of adaptor flanges. The coupling system enables auto accurate alignment of coax probe with printed circuit and mounting holes of waveguide flange and wall of the chassis. With the teachings of the present invention, any damage to projected coax probe is avoided which may be caused due to erroneous or intentional attempt to remove waveguide before the waveguide flange is secured in the wall of the chassis. The coupling system with a subassembly of waveguide and the coax pin enables independent testing of the waveguide performance prior to coupling with the printed circuitry.
[014] The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results. As used in the present disclosure, the forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms “comprises,” “comprising,” “including,” “made of” and “having,” are open ended transitional phrases and therefore specify the presence of stated elements, units and/or components, but do not forbid the presence or addition of one or more other elements, components, and/or groups thereof.
[015] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. The skilled person will be able to devise various structures, shapes of the coupling system that, although not explicitly described herein, embody the principles of the present invention. All the terms and expressions in the description are only for the purpose of the understanding and nowhere limit the invention. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein may be made without departing from the scope of the invention. Terms plurality, top, bottom, front end, rear end, first, second, parallel, inner, outer, perpendicular, primary, secondary, coaxial, collinear and the like are used to differentiate between objects having the same terminology and are in no way intended to represent a chronological order, unless where explicitly stated otherwise. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalents thereof. Thus, while particular type of structure, configuration, shape, material, heights, lengths, widths, diameters, thickness, distances, type of waveguide, chassis, coax probe, printed circuitry, transmission path, external waveguide, fasteners, holes, plates, groove and apertures patterns have been disclosed, it will be appreciated that the embodiments may be manufactured with other design parameters and configurations as well and are not limited to those described herein above may be as per operational requirements and nowhere limits the scope of the invention and are provided only for reference and for understating purpose of the invention.
[016] Referring Figures 1-4 discloses a coupling system (300), a waveguide (100), a flange (110), a back surface (111), a plurality of fasteners (112), a cut-out (114), a front surface (115), a plurality of cut-outs for fasteners (116), a cantilever member (118), a top wall face (120), an aperture (122), a projection/protrusion member (130), a groove (140), a launch pin/ coax probe (150), a side wall face (160), a width (170) of the cantilever member, a length (171) of the projection of coax probe, a height (180) of the cantilever member, a height (181) of the projection/protrusion, an axis (182) of the coax probe, a plurality of apertures of (190-A, 190-B, 190-C, 190-D), a chassis (200), an outer wall surface (210), a front surface (214), a cut-out (220), a first recessed cross-sectional cut-out (225), a width (230) of cut-out, a height (231) of the cut-out, a radial corner relief (232), a height (233) of the radial corner relief, a thickness (234) of first end at outer wall surface, a second recessed cross-sectional cut-out (235), a recessed cross-sectional channel (240), a plurality of side walls (241, 242), a base (243) of the recessed channel, a mid-plane (244) of the plurality of side walls, a rear surface (245), a printed circuitry board (250), a conductive strip (251), a plurality of mounting apertures (260-A, 260-B, 260-C, 260-D), a plurality of apertures (262-A, 262-B, 262-C, 262-D), and a cover (270).
[017] According to an exemplary aspect, the present invention Referring Figures 1-4, discloses a coupling system (300) comprising a waveguide (100) and a chassis (200). The waveguide (100) is of size that includes but not limited to a WR28 constructed in an electrically conductive material with suitable manufacturing process known in the art. A first end of the waveguide (100) is provided with a flange (110) complying to standard that includes but not limited to a UG599/U standard. The flange (110) has a front surface (115), a back surface (111). According to the exemplary embodiment, not limited to at least an edge of the flange (110) may be rounded. The waveguide (100) has fixing provisions on the flange (110) in the form of a plurality of threaded holes or clearance /plain holes or a combination as suitable (190-A, B, C and D). The plurality of apertures (190-A, 190-B, 190-C, 190-D) are located on a front surface (115) of the flange (110) at a first end of said waveguide (100). A plurality of apertures (190-A, 190-B) are located proximate towards a top edge portion of the flange (110) respectively and a plurality of apertures (190-C, 190-D) located below to said apertures (190-A, 190-B) proximate towards a bottom edge portion of the flange (110) respectively. The flange (110) includes a centrally located cut-out (114) on the front surface (115) having a shape that includes but not limited to a rectangle or a square or the like. The flange (110) includes a plurality of oppositely facing cut-outs (116) on the front surface (115) below the apertures (190-C, 190-D) for enabling mounting of fasteners (112a). The cut-outs for example but not limited to a semi-circular shape act as a mean for fastening waveguide to chassis wall. A second end of the waveguide (100) is provided with a cantilever member (118) extending away from said back surface (111) of the flange (110). The cantilever member (118) may be of a shape that includes but not limited to an octagonal shape having a top wall face (120) and at least a side wall face (160). The cantilever member (118) on said back surface (111) is co-axial to said cut-out (114) on the front surface (115) and the cut-out (114) extends into the cantilever member (118). According to an exemplary embodiment, on said top wall face (120) of the cantilever member (118) of the waveguide (100), a projection/protrusion member (130) extends at least along a length of said top wall face (120) which is relieved in the form of a void or break or groove (140) abutting near to the said back surface (111) of the flange (110). The projection/protrusion member (130) may also be provided on top or bottom or both walls of the waveguide (100). At least a surface of the side wall face (160) of the waveguide (100) is provided with an aperture (122) for receiving a launch pin/ coax probe (150) at a right angle to a direction of wave propagation on at least said surface of the side wall face (160) of the waveguide (100). One end of the launch pin/ coax probe (150) is inserted into the aperture (122) at the right angle on at least said surface of the side wall face (160) of the waveguide (100). The launch pin/ coax probe (150) is secured firmly by soldering. The other end of the launch pin which is intended to be coupled with a printed circuitry board (250) projects out from the side wall face (160). The sub-assembly of waveguide (100) and the coax probe (150) is tested independently to verify performance of the waveguide (100) prior to coupling with the printed circuitry board (250).
[018] According to the exemplary embodiment, the chassis (200) at a first end includes an outer wall surface (210) having a plurality of mounting apertures at a front surface (214). A plurality of mounting apertures (260-A, 260-B,260-C, 260-D) are coaxial to said set apertures (190-A, 190-B, 190-C and 190-D) of the waveguide (100). The chassis (200) includes a plurality of apertures (262-A, 262-B, 262-C, 262-D) acting as clearance holes to accommodate projected screws while fixing external waveguide to the waveguide. The chassis (200) has fixing provisions in the front surface (214) of the outer wall surface (210) in the form of a plurality of mounting apertures (260-A, B, C and D) which may be threaded holes or clearance holes or plain holes or a combination as suitable. The chassis (200) includes a centrally located cut-out (220) extending along a width (234) of the outer wall surface (210) relative to the length of said groove (140). The centrally located cut-out (220) having a shape that includes but not limited to a rectangle or a square or the like. The cut-out (220) is configured for receiving and fastening the sub-assembly cantilever member (118) of the waveguide (100) and the coax probe (160). The cut-out (220) includes a radial corner relief (232) facing towards the receiving projection member (130) while ensuring single entry location for waveguide into chassis, the said groove (140) and width of the wall of the chassis in relation to groove secures auto-aligning of said waveguide (100) in a single sideward movement towards a printed circuitry board (250) located within a recessed cross-sectional channel (240) formed within the chassis (200). The profile of the cut- out (220) is such that a width (230) of the cut-out (220) is just wider than a length equal to a width (170) of the cantilever member (118) of the waveguide (100) plus length (171) of the projection of coax probe (150). Height (231) of the cut-out (220) is just higher than height (180) of the cantilever member (118) of the waveguide (100). The radial corner relief (232) formed in the cut-out (220) has a height (233) just bigger than the height (181) of the projection/protrusion member (130) in the waveguide (100). The thickness (234) of first end at outer wall surface (210) of the chassis (220) is just less than the cut out/relief/groove (140) on waveguide (100).
[019] According to the exemplary embodiment, the second end of the chassis (200) includes a plurality of recessed cross-sectional cut-outs (225, 235) formed on a top surface of the second end. A first recessed cross-sectional cut-out (225) is formed coaxial to cut-out (220) configured for receiving the cantilever member (118) of the waveguide (100) passed through the cut-out (220). The profile of the first recessed cross-sectional cut-out (225) is such that a width and depth/height of the first recessed cross-sectional cut-out (225) is equal to width and depth / height of the cut-out (220) and length/thickness of the first recessed cross-sectional cut-out (225) is just higher than the length/thickness of the cut-out (220) such that cantilever beam is accommodated in the chassis after insertion with sufficient clearance. A second recessed cross-sectional cut-out (235) is formed abutting the first recessed cross-sectional cut-out (225). The profile of the second recessed cross-sectional cut-out (235) is such that it accommodates cover (270) for recessed cross-sectional channel (240) of the PCB (250) with sufficient clearance.
[020] According to the exemplary embodiment, a recessed cross-sectional channel (240) is formed within the chassis (200). The profile of the recessed cross-sectional channel (240) is for example but not limited to a curved shape and the shape depends upon the shape of the PCB such that width of the recessed cross-sectional channel accommodates width of the printed circuitry board (250) with sufficient clearance mounted on said base (243). Extent / Span of the recessed cross-sectional channel (240) is equal to extent / span of the printed circuitry board (250) extending till surface wall (243). The profile of the recessed cross-sectional channel (240) towards the first recessed cross-sectional cut-out (225) has a free right-angled opening for receiving the coax probe (150) to contact the printed circuit board (250). The distance of the mid-plane (244) of the plurality of side walls (241, 242) of the recessed cross-sectional channel (240) is such that the mid plane (244) is coplanar and coincides with the axis (182) of the coax probe (150) of the waveguide (100) after insertion into the chassis (200) at a position ‘B’ and ‘C’ during assembly of the waveguide (100) and the chassis (200) for direct coupling along with auto-alignment of the coax probe (150) with a conductive strip (251) of the printed circuitry board (250) at said right angle. Height of the base of the said recessed cross-sectional channel (240) on which PCB (250) is placed clearance gap is maintained for soldering between a cylindrical periphery of the coax pin (150) and an abutting surface of said PCB (250) at position ‘C’. The launch pin/ coax probe (150) is located on the side wall face (160) of the waveguide (100) that is facing towards the printed circuitry board (250).
[021] According to another aspect, the present invention discloses an operation method of assembling the waveguide (100) and the chassis (200). The waveguide (100) is inserted into the chassis (200) at cut-out (220) by aligning the projection/protrusion member (130) and radial corner relief (232) in the cut-out (220). Accordingly, at the position ‘B’ where the back surface (111) of the waveguide flange (110) contacts the front surface (214) of the outer wall surface (210) of the chassis (200), the waveguide (100) is slide sideward towards printed circuitry board (250) until a position ‘C’ where the side wall face (160) of the cantilever member (118) of the waveguide (100) contacts side wall of the base (243). At this position (c), axis of the coax probe coincides with the mid-plane (244) of the plurality of side walls (241, 242) of the recessed cross-sectional channel (240). During traverse movement of waveguide (100) from the position ‘B’ to ‘C’, i.e., movement in the direction other than sideward is restricted by projection/protrusion member (130) and groove (140) of the waveguide (100) and controlled thickness (234) of the outer wall surface (210). During this sequence of movement of the waveguide (100) with relation to chassis (200), at position C, the coax probe (150) is aligned with the conductive strip (251) of the printed circuitry board (250) and plurality of apertures (190-A, B, C and D) in the flange (110) of the waveguide (100) are aligned with respective mounting apertures (260-A, B, C and D) in the front surface (214) of the outer wall surface (210) of the chassis (200). Waveguide (100) is secured in the chassis (200) first with plurality of fasteners (112a, 112b) and the probe (150) is soldered subsequently on to the printed circuit. Final position ‘C’ of the waveguide (100) by sideward movement is accurately controlled by location of the plurality of side walls (241, 242). The cover (270) is used at the end of assembly to shield printed circuitry board (250).
[022] According to the exemplary embodiment, the presence of radial corner relief (232) in the cut-out (220) in the outer wall surface (210) and projection/protrusion member (130) in the waveguide (100) ensures sole entry location for the waveguide (100) into the chassis (200). At position ‘B’, sideward movement of the waveguide (100) towards printed circuitry board (250) is guided by the presence of groove (140) in the waveguide (100) and by the controlled width (234) of the outer wall surface (210) at first end. The coupling system (300) ensures auto accurate alignment of coax probe (150) with the conductive strip (251) of printed circuitry board (250) and plurality of apertures (190-A, B, C and D) in the flange (110) of the waveguide (100) and mounting apertures (260-A, B, C and D) in the front surface (214) of the outer wall surface (210) of the chassis (200) at same instance. The coupling system (300) ensures that damage to the coax probe (150) is avoided which may be caused due to erroneous attempt to remove waveguide (100) position at location ‘C’ before the waveguide flange (110) is secured in the outer wall surface (210). This is achieved because of controlled width (234) of the outer wall surface (210) of the chassis (200) and projection/protrusion member (130) of waveguide (100). The coupling system (300) minimizes number of interconnections in transmission path i.e., aids in providing a direct coupling of printed circuitry board (250) and waveguide (100) via coax probe (150) at right angle and configures an interface for direct coupling of external waveguide. The coupling system (300) completely avoids cable assemblies leading to a compact system design. As the coupling system (300) provides a direct interface for waveguides of external modules, the need of adaptor flange is also completely avoided.
[023] According to the exemplary embodiment, the coupling system enables compact module design by eliminating conventional cable assemblies required to couple ‘right angle waveguide to coax adaptors’ to printed circuitry thereby saving material. Sole coupling opportunity in the apparatus avoids material and effort wastage due to erroneous assembly methods. Possibility of performance degradation during energy transmission is reduced as number of interconnections is reduced. The subassembly of waveguide and the coax pin enables independent testing of waveguide performance prior to coupling with printed circuitry. This approach finds its applications in various microwave subsystems like front end receivers, power amplifiers, frequency up converters, down converter modules.
[024] There have been described and illustrated herein several embodiments of exemplary indicative implementation of a coupling system. It will be also apparent to a skilled person that the embodiments described above are specific examples of a single broader invention, which may have greater scope than any of the singular descriptions taught. There may be many alterations made in the description without departing from the scope of the invention. The present invention is simple in construction and design, integrated, cost effective and easy to manufacture and assembly. While particular embodiments of the invention have been described, it is not intended that the invention be limited said configuration disclosed thereto, as it is intended that the invention be as broad in scope as the art will allow and that the specification be read likewise not restrictive to the terminology described herein above. Any discussion of embodiments included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
 
, Claims:We Claim:
1. A coupling system (300) comprising:
a waveguide (100) having:
a flange (110) with a centrally located cut-out (114) and a plurality of apertures (190-A, 190-B, 190-C, 190-D) on a front surface (115) of the flange (110) at a first end of said waveguide (100);
a cantilever member (118) extending away from a back surface (111) of the flange (110) at a second end of said waveguide (100) co-axial to said cut-out (114), said cantilever member (118) having at least a top wall face (120) and at least a side wall face (160);
a projection member (130) extending at least along a length of a wall face of said cantilever member (118), said projection member (130) is relieved by a groove (140) abutting said back surface (111) of the flange (110); and
an aperture (122) located on a surface of at least said side wall face (160) of the cantilever member (118) for receiving a coax probe (150) projecting at a right angle to at least said side wall face (160); and
a chassis (200) having:
an outer wall surface (210) with a plurality of mounting apertures on a front surface (214) at a first end; and
a centrally located cut-out (220) extending along a width (234) of the outer wall surface (210) relative to a length of said groove (140), said centrally located cut-out (220) having a radial corner relief (232) facing towards the receiving projection member (130) while ensuring a single entry location for waveguide (100) into chassis (200), said wall width (234) along with the groove (140) secure auto-aligning of said waveguide (100) in a single sideward movement towards a printed circuitry board (250) located within a recessed cross-sectional channel (240) formed within the chassis (200).

2. The coupling system (300) as claimed in claim 1, wherein a mid-plane (244) of the recessed cross-sectional channel (240) with a plurality of side walls (241, 242) is coplanar and coincides with an axis (182) of the coax probe (150) of the waveguide (100) after assembling of the waveguide (100) and the chassis (200) for direct coupling along with auto-alignment of the coax probe (150) with a conductive strip (251) of the printed circuitry board (250) at said right angle.

3. The coupling system (300) as claimed in claim 1 or 2, wherein said cut- out (220) has a width (230) wider than a length equal to a width (170) of the cantilever member (118) of the waveguide (100) plus length (171) of the projection of coax probe (150), a height (231) higher than height (180) of the cantilever member (118) of the waveguide (100) and a thickness (234) of the cut-out (220) within said first end outer wall surface (210) is less than the groove (140) on waveguide (100).

4. The coupling system (300) as claimed in anyone of the preceding claims 1-3, wherein said radial corner relief (232) formed in the cut-out (220) has a height (233) higher than the height (181) of the projection/protrusion (130) in the waveguide (100).

5. The coupling system (300) as claimed in anyone of the preceding claims 1-4, wherein the chassis (200) includes at least a recessed cross -sectional cut-out (225, 235) formed on a top surface of the chassis (200) at a second end for receiving the cantilever member (118) of the waveguide (100) passed through the cut-out (220).

6. The coupling system (300) as claimed in anyone of the preceding claims 1-5, wherein said projection (130) and said groove (140) of the waveguide (100) and said thickness (234) of the outer wall surface (210) restrict transverse movement of the waveguide (100) into the chassis (200) in a direction other than said sideward movement.

7. The coupling system (300) as claimed in anyone of the preceding claims 1-6, wherein said plurality of apertures (190-A, 190-B, 190-C, 190-D) on flange (110) and a plurality of mounting apertures (260-A, B, C and D) in the front surface (214) of the outer wall surface (210) of the chassis (200) are threaded or plain or a clearance type or a combination thereof.

8. The coupling system (300) as claimed in anyone of the preceding claims 1-7, wherein at least said recessed cross -sectional cut-out (225, 235) includes a cover (270), said cover (270) shields said printed circuitry board (250).

9. The coupling system (300) as claimed in anyone of the preceding claims 1-8, wherein a height of said base (243) of said recessed cross-sectional channel (240) ensures clearance gap is maintained for soldering between a cylindrical periphery of the coax pin (150) and an abutting surface of said PCB (250).

Dated this 31st day of March, 2023
For BHARAT ELECTRONICS LIMITED
By their Agent

(D. MANOJ KUMAR) (IN/PA 2110)
KRISHNA & SAURASTRI ASSOCIATES LLP