WO2021154415A1

WO2021154415A1 - Transceiver receptacle with emi cage and bezel clips that provide high shielding effectiveness

Info

Publication number: WO2021154415A1
Application number: PCT/US2020/065526
Authority: WO
Inventors: Gary E. Biddle
Original assignee: Samtec, Inc.
Priority date: 2020-01-27
Filing date: 2020-12-17
Publication date: 2021-08-05
Also published as: TWM616676U; TW202130070A

Abstract

A receptacle includes a cage including a bezel opening and through holes and a bezel clip that is attached to the cage at the bezel opening and that includes first bezel fingers and second bezel fingers. The first bezel fingers are located along an inner surface of the cage. The second bezel fingers extend through the through holes such that outer finger portions extend along an outer surface of the cage and inner finger portions extend along the inner surface of the cage. Adjacent second bezel fingers have different lengths.

Description

TRANSCEIVER RECEPTACLE WITH EMI CAGE AND BEZEL CLIPS THAT PROVIDE HIGH SHIELDING EFFECTIVENESS

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims benefit to U.S. Patent Application No. 62/966,371, filed on January 27, 2020, the entire contents of which are hereby incorporated herein by reference. In addition, the entire contents of U.S. Patent Application No. 16/629,308, filed on January 7, 2020, are hereby incorporated herein by reference.

BACKGROUND

1. Field

[0002] The present invention relates to transceiver receptacles with cages that include bezel clips. More specifically, the present invention relates to transceiver receptacles with cages that include bezel clips with staggered fingers and/or fingers of different lengths.

2. Description of the Related Art

[0003] Electrical connectors are used to allow electrical devices, such as substrates or printed circuit boards (PCBs), to communicate with one another. Various standards and specifications have been proposed and implemented for electrical connectors that transmit high-frequency signals. One example is Quad Small Form-factor Pluggable (QSFP), which is a specification for compact, hot-pluggable transceivers typically used in data communication systems. QSFP transceiver receptacles can accept both electrical and optical transceivers. Recently, a modification to QSFP, referred to as Quad Small Form-factor Pluggable Double Density (QSFP-DD) has been proposed to include an additional row of contacts on a transceiver circuit board to increase bandwidth. Despite shielding that is commonly included in transceiver receptacles, including QSFP transceiver receptacles, electromagnetic interference (EMI) is a still a concern for devices that include electrical connectors such as those described above.

[0004] For example, in a device that includes a QSFP transceiver receptacle, a physical opening is provided in the device that reduces the overall shielding effectiveness of the device and both allows EMI from external devices to affect operation of the device and allows EMI from the device to affect the operation of external devices. In addition, the problems of EMI emitted from the device and EMI emitted from the device can occur both when the transceiver receptacle is empty and when a transceiver is inserted into the transceiver receptacle.

SUMMARY

[0005] To overcome the problems described above, embodiments of the present invention provide transceiver receptacles each including a bezel that includes staggered fingers and/or fingers of different lengths to significantly improve EMI performance.

[0006] According to an embodiment of the present invention, a receptacle includes a cage including a bezel opening and through holes and a bezel clip that is attached to the cage at the bezel opening and that includes first bezel fingers and second bezel fingers. The first bezel fingers are located along an inner surface of the cage, the second bezel fingers extend through the through holes such that outer finger portions of the second bezel fingers extend along an outer surface of the cage and inner finger portions the second bezel fingers extend along the inner surface of the cage. Adjacent second bezel fingers have different lengths.

[0007] The second bezel fingers can include a first finger, a second finger, and a third finger; each of the first finger and the third finger can have a first length; and the second finger can have a second length different from the first length. The first and the second fingers can be positioned immediately adjacent to each other, and the second and third fingers can be positioned immediately adjacent to each other.

[0008] The second fingers can include bends that connect the outer finger portions and the inner finger portions. The receptacle can further include a connector that is mateable with a transceiver.

[0009] According to an embodiment of the present invention, a cage includes four walls defining a bezel opening and at least three holes in at least one of the four walls arranged in first and second rows. Adjacent holes of the at least three holes in a circumferential direction along the four walls are in different rows. The first row is a first distance from the bezel opening. The second row is a second distance from the bezel opening different from the first distance. [0010] According to an embodiment of the present invention, a receptacle includes a substrate, a connector on the substrate, and the cage according to the various embodiments of the present invention connected to the substrate and surrounding the connector.

[0011] The receptacle can further include a bezel clip attached to the cage at the bezel opening. The bezel clip can include first bezel fingers and second bezel fingers; the first bezel fingers can be located along an inner surface of the cage; and the second bezel fingers can extend through the at least three holes on the at least one of the four walls such that outer finger portions of the second bezel fingers extend along an outer surface of the cage and inner finger portions of the second bezel fingers extend along the inner surface of the cage. Adjacent ones of the second bezel fingers can have different lengths. The second bezel fingers can include a first finger, a second finger, and a third finger; each of the first finger and the third finger can have a first length; and the second finger can have a second length different from the first length. The first and the second fingers can be positioned immediately adjacent to each other; and the second and third fingers can be positioned immediately adjacent to each other. The second fingers can include bends that connect the outer finger portions and the inner finger portions. The bends of adjacent second bezel fingers can be at different locations along lengths of the second bezel fingers.

[0012] According to an embodiment of the present invention, a receptacle includes a cage including a bezel opening and through holes and a bezel clip that is attached to the cage at the bezel opening and that includes first bezel fingers and second bezel fingers. The first bezel fingers are located along an inner surface of the cage. The second bezel fingers includes bends that connect outer finger portions and inner finger portions and that allow the second bezel finger to extend through the through holes such that the outer finger portions extend along an outer surface of the cage and the inner finger portions extend along the inner surface of the cage. The bends of adjacent second bezel fingers are at different locations along lengths of the second bezel fingers.

[0013] The second bezel fingers can include a first finger, a second finger, and a third finger; each of the first finger and the third finger can have a first length; and the second finger can have a second length different from the first length. The first and the second fingers can be positioned immediately adjacent to each other; and the second and third fingers can be positioned immediately adjacent to each other.

[0014] The adjacent second bezel fingers can have different lengths. The receptacle can further include a connector that is mateable with a transceiver.

[0015] According to an embodiment of the present invention, a bezel clip includes first bezel fingers and second bezel fingers, wherein the first bezel fingers have a same or substantially a same length, adjacent second bezel fingers have different lengths, and each of the second bezel fingers is longer than each of the first bezel fingers.

[0016] According to an embodiment of the present invention, a bezel clip includes first bezel fingers and second bezel fingers, wherein the first bezel fingers have a same or substantially a same length, adjacent second bezel fingers include bends that are located at different lengths along lengths of the second bezel fingers, and each of the second bezel fingers is longer than each of the first bezel fingers.

[0017] The above and other features, elements, characteristics, steps, and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS [0018] Fig. 1 is a perspective view of a cage with bezel clips.

[0019] Fig. 2 is a close-up perspective view of the cage of Fig. 1.

[0020] Figs. 3 and 4 are close-up sectional views of the cage of Fig. 1.

[0021] Fig. 5 is a schematic diagram showing a transceiver receptacle included in a device.

[0022] Fig. 6 is a perspective view of the cage of Fig. 1 without bezel clips.

[0023] Figs. 7 and 8 are perspective views of the bezel clips of Fig. 1.

[0024] Fig. 9 is a perspective of a cage with bezel clips with an alternative structure.

[0025] Fig. 10 shows a connector that can be used with the cage of Fig. 1.

DETAILED DESCRIPTION

[0026] Fig. 5 is a schematic diagram showing a transceiver receptacle 10 included in a device 100. The transceiver receptacle 10 includes a cage 14 that provides EMI shielding for the device 100 and for external devices (not shown in Fig. 5). Although not shown in Fig. 5, the transceiver receptacle 10 includes a connector (not shown in Fig. 5) that can be, for example, a double density (DD) connector such as a Quad Small Form-factor Pluggable Double-Density (QSFP-DD) connector. The connector provides an electrical or optical connection with a transceiver (now shown in Fig. 5) when the transceiver is inserted into the transceiver receptacle 10. Fig. 10 shows an example of a connector 60 that can be used with the cage 14 of Fig. 1 to define the transceiver receptacle 10. A transceiver can be plugged into connector 60. The connector 60 provides a mechanical connection to secure the transceiver to a mounting substrate 61 and electrical connections between the transceiver and the mounting substrate 61. Any suitable substrate can be used for the mounting substrate 61 including, for example, a PCB. The connector 60 can include electrical contacts and can be directly connected and fixed to the mounting substrate 61. The connector 60 can include cables 62 that can be high-speed and/or low-speed cables. The connector 60 can be connected to the mounting substrate 61.

The end of the cables 62 not shown in Fig. 10 can be connected to the mounting substrate 61 or to any other suitable device. For example, the cables 62 can allow signals to be transmitted without having to be transmitted through the mounting substrate 61 or can allow signals to be transmitted only a short distance through the mounting substrate 61. The connector 60 can be mounted to the mounting substrate 61 in a floating arrangement such that the connector 60 floats or moves with respect to the mounting substrate 61. Although not shown, a thermal path can be provided for the connector 60.

[0027] The transceiver receptacle 10 can be mounted on a host substrate 110. The host substrate 110 can be any suitable substrate, including a PCB. As shown in Fig. 5, the cage 14 is grounded to a chassis ground 101 of the device 100, and the transceiver receptacle 10 includes a bezel opening 15 that receives an electrical component, for example, a transceiver. The bezel opening 15 provides an opening in the device 100 that is susceptible to both receiving and emitting EMI. Fig. 5 shows an example in which the transceiver receptacle 10 is not mated with a transceiver and in which the device 100 internally generates EMI ("hostile environment" in Fig. 5) that is shielded from an exterior of the device ("quiet environment" in Fig. 5). As a more specific example, if the device 100 has high internal energy levels that generate a large amount of EMI, the cage 14 can have, for example, high shielding effectiveness to meet standards or guidelines for electromagnetic compatibility (EMC) compliance. EMC compliance can vary, for example, according to the particular application or surrounding environment of the device 100. Shielding effectiveness of the cage 14 is determined by the amount of power of the EMI that transfers between the internal and external environments of the device 100.

[0028] Figs. 1-3 show the cage 14 with bezel clips 31, and Fig. 6 shows a cage 14 without the bezel clips 31. The cage 14 includes four walls that define a bezel opening 15 through which a transceiver can be inserted and to which the bezel clips 31 can be attached. Although the cage 14 shown in Figs. 1-3 and 6 can accommodate a single transceiver, the cage 14 can be modified to accommodate more than one transceiver. The cage 14 includes through holes 19 in the walls of the cage 14 that receive the bezel clips 31. The through holes 19 can be staggered and can be arranged in first and second rows 19a, 19b along a circumferential direction, which is direction along the four walls of the cage 14 that is perpendicular or substantially perpendicular to a transceiver-insertion direction, as shown in Figs. 1-3 and 6. Adjacent through holes 19 in the circumferential direction can be included in different first or second rows 19a or 19b.

[0029] As shown in Fig. 6, the through holes 19 can have different sizes or areas. For example, adjacent through holes 19 can have different sizes or areas or every other through hole 19 can have a different size or area. Through holes 19 can be arranged in a first linear array or first row 19a of through holes 19. Through holes 19 can be arranged in a second linear array or second row 19b of through holes 19. Sequential through holes 19 in the first linear array or first row 19a of holes can have different areas, for example, a first through hole 19 having a first area and a second sequential through hole 19 having a second area, where the second area is greater than the first area. The second area can be up to twice as large, numerically, as the first area. Sequential through holes 19 in the second linear array or second row 19b of holes can have different areas, for example, a first through hole 19 having a first area, a second sequential through hole 19 having a second area, where the second area is greater than the first area. The first and second rows 19a, 19b can be directly adjacent to each other and can be positioned parallel or substantially parallel to each other. The first row 19a can include a first pattern of through holes 19, and the second row 19b can include a second pattern of through holes 19 that is inverted with respect to the first pattern. For example, the first row 19a can include a small, large, small, large hole pattern, and the second row 19b can include a large, small, large, small hole pattern. The first row 19a and the second row 19b can be staggered such that none of the through holes 19 of the first row 19a are aligned in the transceiver-insertion direction with the through holes 19 in the second row 19b. Each of the first and second rows 19a, 19b can include at least one, at least two, at least three, or at least four through holes 19 that are immediately adjacent to each other in sequential order. Each of the first and second rows 19a, 19b can include three sequential through holes 19 along the first and second rows 19a, 19b in which two of the through holes 19 have the same size or area while the third through hole 19 has a different size or area. A third linear array of holes 20 can be spaced from, and extend parallel or substantially parallel to, a first linear array of through holes 19 in the first row 19a. The third linear array of through holes 20 can be spaced from, and extend parallel or substantially parallel to, the second linear array of through holes 19 or the second row 19b.

[0030] Any number of through holes 19 and any number of rows of through holes 19 may be included in the cage 14. The cage 14 can also include heatsink openings 16 through which the heatsink 21 can engage a transceiver when a transceiver is inserted into the cage 14. Although Fig. 1 shows two heatsink openings 16, the cage 14 may include any number of heatsink openings 16, including no heatsink openings.

[0031] As shown in Fig. 6, the cage 14 can include the third linear array of through holes 20 that engage with indents 34 of the bezel clip 31. The through holes 20 can be arranged in a single row 20a along the circumferential direction.

[0032] The cage 14 can be made of any suitable conductive material and can be manufactured by any suitable method. For example, the cage 14 can be manufactured from stamped metal. Although not shown in Figs. 1-3, the cage 14 can be mounted to any suitable substrate, including, for example, a PCB. The cage 14 can be mounted to the substrate by a press-fit connection (as shown in Fig. 9), through-holes (as shown in Figs. 1, 2, and 6), or surface mount technology. [0033] Figs. 1 and 2 show that two bezel clips 31 are arranged side-by-side on each of the top and the bottom walls of the cage 14 and that one bezel clip 31 is arranged on each of the side walls of the cage 14. Depending on the shape of the cage 14, different numbers of bezel clips 31 per side of the cage 14 can be included. For example, if the cage 14 includes two transceiver-receiving ports, four bezel clips can be arranged along each of the top and bottom walls of the cage 14. Each bezel clip 31 includes first fingers 32 and second fingers 33. Each first finger 32 can include a corresponding first free end that is not physically connected to a second free end of an adjacent second finger 33. Each first and second finger 32, 33 can be cantilevered from one respective second end of a respective first finger 32 or a respective second finger 33. The second fingers 33 include outer finger portions 33a and inner finger portions 33b. The first fingers 32 extend along an inner surface of the cage 14. The second fingers 33 extend into through holes 19 in the cage 14 with the outer finger portions 33a extending along an outer surface of the cage 14 and the inner finger portions 33b extending along an inner surface of the cage 14. The number of first fingers 32 and the number of the second fingers 33 can be at least three. For example, Figs. 1-3 shows that the number of first fingers 32 and the second fingers 33 for each bezel clip 31 is four, but any suitable number of first fingers 32 and the second fingers 33 can be included.

[0034] In Figs. 1-3, the bezel clips 31 provided on each of the top and bottom walls of the cage 14 are substantially the same as the bezel clips 31 provided on each of the side walls of the cage 14. However, the bezel clips 31 can be different. For example, the bezel clips 31 used on the top and bottom walls of the cage 14 can have more fingers so that only one bezel clip 31 is provided on the top and bottom walls of the cage 14.

[0035] Fig. 9 shows cage 14 with an alternative structure. The cage 14 in Fig. 9 includes springs 21 and a retention latch 22 that can secure a heatsink or the like, for example, heatsink 21 shown in Fig. 5, to the cage 14. The springs 21 can be leaf springs with an S-shape as shown in Fig. 9, but other suitable springs and shapes could also be included. The retention latch 22 can prevent the heatsink from becoming unattached from the cage 14. Although the retention latch 22 in Fig. 9 is located in the rear opening 16 opposite to the bezel opening 15, the retention latch 22 can also be located in the opening 16 closer to the bezel opening 15. Although the retention latch 22 in Fig. 9 is centered with respect to the rear opening 16, the retention latch 22 can be laterally offset so as not to be centered in the rear opening 16.

[0036] The springs 21 can be stamped and formed when the cage 14 is manufactured. Accordingly, the cage 14 and the springs 21 may define a monolithic body, that is, define a single unitary structure. Other possible structures of the cage 14 and the springs 21 may also be provided. For example, the cage 14 may be stamped, and then the springs 21 may be subsequently added to the cage 14 with each of the springs 21 extending into the opening 16 of the cage 14.

[0037] Each of the springs 21 can extend from the cage 14 in substantially the same general direction. As shown in Fig. 9, the cage 14 can include two openings 16, and two springs 21 can extend into each of the openings 16. Fig. 9 shows four springs 21, but any number of springs, including, for example, two springs, can be used, and any arrangement of springs can be used, including, for example, two springs in one of the openings 16 and none in the other opening 16, or one spring in each of the openings 16. It is also possible to use any suitable number, locations, and structure of opening(s) 16. The heatsink can slide onto the cage 14 in a first direction and the springs 21 can engage with pockets in the heatsink. The springs 21 then significantly reduce or prevent movement of the heatsink in the plane defined by the opening 16 except for in a direction opposite to the first direction.

[0038] As shown in Fig. 9, the springs 21 extend into the openings 16 of the cage 14, and the tips of the springs 21, at the far-end of the springs 21 opposite to the portion of the springs 21 attached to the cage 14, include engagement portions that are located within the plane defined by the openings 16, with the rest of the springs 21 being located above the plane defined by the openings 16. As shown in Fig. 9, the springs 21 can have generally an S-shape in which the springs 21 are folded back onto themselves with the engagement portions extending from the top of the S-shapes downward towards the cage 14. Other suitable shapes and structures may also be provided, including, for example, depending on the size and location of the pockets in the heatsink, the tips and engagement portions of the springs 21 being located above or below the plane defined by the openings 16. [0039] Each spring 21 can be inserted in a corresponding pocket in the heatsink to engage with the heatsink. The springs 21 provide a downward force on the heatsink to bias the heatsink to contact a transceiver when the transceiver is plugged into the cage 14. The springs 21 can automatically bias the heatsink against the transceiver. The springs 21 allow the heatsink to float and to travel both up and down. The floating heatsink with up and down travel can accommodate transceivers of different heights. The heatsink does not need a spring or a strap that exerts a force on the top, side, or rear surfaces of the heatsink. The springs 21 on the cage 14 exert a downward force on the pockets within the heatsink. As shown in Fig. 9, the cage 14 can include springs 23 on the bottom that push the floating heatsink up towards the top of the cage 14. The springs 23 on the bottom of the cage 14 can have a similar spring force over a similar deflection range as the springs 21 on the top of the cage 14, which allows the transceiver to align with the opening of the electrical connector within the cage 14 and which reduces asymmetric loading forces of the transceiver on the cage-connector contacts. [0040] Figs. 3 and 4 are close-up cross-sectional views of the cage 14 near the bezel opening 15. Fig. 3 is a cross-section of the cage 14 in the thickness direction such that one of the side walls of the cage 14 is shown. Fig. 4 is a cross-section of the cage 14 in the width direction such that either of the top or bottom wall of the cage 14 is shown. Figs. 7 and 8 show the bezel clips 31 without the cage 14.

[0041] As shown in Figs. 3, 4, 7, and 8, the first fingers 32 can each have the same length or approximately the same length within manufacturing tolerances, and the second fingers 32 can have different lengths. For example, adjacent second fingers 32 can have different lengths. Alternatively, the first fingers 32 can have different lengths, and/or the second fingers 33 can each have the same length or approximately the same length within manufacturing tolerances with both the outer finger portions 33a and the inner finger portions 33b having different lengths to accommodate the staggered through holes 19. As shown in Figs. 1 and 2, the outer finger portions 33a can have different lengths depending on the location of the corresponding through hole 19 through which the second finger 33 extends. As shown in Fig. 3, the inner finger portions 33b can have the same length or approximately the same length within manufacturing tolerances. Thus, the overall lengths of the second fingers 33 can be different. [0042] Each of the first fingers 32 and the second fingers 33 can have different lengths and/or widths. For example, adjacent first fingers 32 can have different lengths and/or widths, and adjacent second fingers 33 can have different lengths and/or widths. However, all of the first fingers 32 and/or all of the second fingers 33 can have the same length and/or width. The widths of the second fingers 33 are provided in a pattern that corresponds to the combination of the first and second patterns of the through holes 19. For example, the widths of the second fingers 33 can have a pattern of small, large, large, small.

[0043] Each of the second fingers 33 include a bend that connects the outer finger portions 33a and the inner finger portions 33b and that allows the second fingers 33 to extend through the through holes 19. Adjacent fingers of the second fingers 33 can have bends located at different lengths along the second fingers. The pattern of the bends of the second fingers 33 can alternate. For example, the bends of the second fingers 33 can alternate between being closer to the bezel opening 15 and further away from the bezel opening 15. If more than two rows 19a, 19b of through holes 19 are included, more than two locations of the bends can be provided. The location of the bends can be staggered such that adjacent bends have different locations. The second fingers can include three fingers that are immediately adjacent to each other with two bends at the same location and with one bend at a different location.

[0044] The second fingers 33 are significantly longer than the first fingers 32. In addition, the second fingers 33 pass through the through holes 19 in the cage 14, and thus include outer finger portions 33a located along an outer surface of the cage 14 and inner finger portions 33b located on the same inner surface of the cage 14 as the first fingers 32. Although the through holes 19 in the cage 14 could potentially provide locations of EMI emissions, EMI shielding for the through holes 19 is provided by the second fingers 33 passing through the through holes 19 to define the inner finger portions 33b and outer finger portions 33a of the second fingers 33. [0045] On the left side of Fig. 3, the through hole 19 is included in the second row 19b of through holes 19 that is farther away from the bezel opening 15, and on the right side of Fig. 3, the through hole 19 is included in the first row 19a of through holes 19 that is closest to the bezel opening 15. On both the left and right sides of Fig. 4, the through holes 19 are included in the first row 19a of through holes 19 that is closest to the bezel opening 15. The first fingers 32 can extend along the inner surface of the cage 14 to the first row 19a of through holes 19 but not to the second row 19b of through holes 19. The first fingers 32 that extend to the first row 19a can be arranged such that those first fingers 32 come into contact with the second fingers 33 that extend through the through holes 19 in the first row 19a when a transceiver is inserted into the cage 14. The first fingers 32 can also be arranged such that the first fingers 32 do not come into contact with the second fingers 33 when a transceiver is inserted into the cage 14. [0046] The fingers of the first fingers 32 and the second fingers 33 can be physically separated from one another over a portion of their respective lengths by air gaps, can be cantilevered at only one end, and can be physically or electrically connected together at one end. The fingers of the first fingers 32 and the second fingers 33 can include only one respective free end. The bezel clips 31 can be secured to the cage 14 by any suitable connection, including soldering, interference-fit connections, and the like. The inner finger portions 33b can be spaced away from a bezel opening 15 of the cage 14 and spaced away from first fingers 32 with the inner finger portions 33b only physically touching an electrically conductive outer surface of an electrical connector or transceiver and not physically touching a panel wall of device 100. [0047] The bezel clip 31 can be made of any suitable conductive material and can be made by any suitable method. For example, the bezel clip 31 can be from stamped metal. The bezel clip 31 can be mounted to the cage 14 using any suitable method, including, for example, indents 34.

[0048] Each of the first fingers 32, the outer finger portions 33a of the second fingers 33, and the inner finger portions 33b of the second fingers 33 can include a raised surface (e.g., a "bump") that provides a press-fit mechanical connection and an electrical connection. More specifically, the raised surface of the outer finger portions 33a provides a mechanical and electrical connection from the EMI bezel to the chassis ground 101 of the device 100 that includes the transceiver receptacle 10. Both of the first fingers 32 and the inner finger portions 33b contact the transceiver when the transceiver is inserted into the cage 14 of the transceiver receptacle 10. Accordingly, the overall number of bezel finger contact points with the transceiver is able to be increased, for example, by about double when compared with other known receptacles due to the additional contact points provided by the inner finger portions 33b. This increase in the overall number of bezel finger contact points with the transceiver also reduces the series impedance of the ground connection of the cage 14 by about 50% or more when compared with other known receptacles. A method to reduce unwanted EMI emissions can include reducing the series impedance of a ground connection between a cage 14, a bezel clip 31, and a mating connector or transceiver by adding points of physical and electrical contact between the bezel clip 31 and the mating connector or transceiver, for example, physical and electrical contact with an electrically conductive outer surface of a mating connector or transceiver. Another method can include decreasing EMI emission from a cage 14 by adding points of physical and electrical contact between a bezel clip 31 of the cage 14 and a mating connector or transceiver, for example, points of physical and electrical contact with an electrically conductive outer surface of a mating connector or transceiver.

[0049] In addition, the inner finger portions 33b are located in an interior of the device 100 that includes the transceiver receptacle 10, that is, behind the bezel opening 15 of the transceiver receptacle 10 in a direction toward a rear wall of the cage 14. Thus, EMI generated within the transceiver is able to be routed by a short electrical path from the second fingers 33, through the through hole 19 of the cage 14, and to a ground connection between the raised surface of the outer finger portions 33a and the chassis ground 101 of the device 100. Further, since the grounding path begins within the device 100 at the inner finger portions 33b, and not outside of the device 100 within the bezel opening 15, a transceiver receptacle 10 with bezel clips 31 is able to significantly reduce EMI emissions both when the transceiver receptacle 10 is empty and when the transceiver receptacle 10 is mated with a transceiver. Stated another way, a method includes shorting unwanted EMI fields generated by a transceiver or other mating electrical connector to ground before the EMI fields reach an opening in a panel that receives outer finger portions 33a or first fingers 32 of a bezel clip 31. Moreover, when the transceiver receptacle 10 is mated with a transceiver, the increased number of contact points between the first and second fingers 32, 33 and the transceiver significantly improves heat dissipation away from the connector 60, which also helps to reduce EMI emissions. A method can include dissipating heat away from a connector by increasing the number of contact points between the first and second fingers 32, 33 of a bezel clip 31 and a heat source, for example, a transceiver or other mating connector.

[0050] The transceiver receptacle 10 shown in Fig. 5 provides significantly improved shielding performance, when compared to the prior art, in the frequency range of about 8 GHz to about 14 GHz and provides better shielding effectiveness, when compared with the noise floor, in the frequency range of about 4 GHz to about 14 GHz.

[0051] As described above, both of the first fingers 32 and the inner finger portions 33b contact the transceiver when the transceiver is inserted into the cage 14 of the transceiver receptacle 10, thereby providing multiple ground paths to reduce the series impedance of the ground connection among the cage 14, the bezel clip 31, and the mating connector or transceiver. Accordingly, the transceiver receptacle 10 shown in Fig. 5 provides shielding performance that is very close to the noise floor in the frequency band of about 500 MHz to about 4 GHz and in the frequency band of about 14 GHz to about 20 GHz. The shielding performance, or shielding effectiveness, refers to the mitigation of power transfer of common mode energy. In addition, shielding performance in the above frequency bands can be further increased, for example, by including preamplifiers. Overall, the transceiver receptacle 10 shown in Fig. 5 is able to increase dynamic range by about 10 dB, which can then be further increased to about 35 dB to about 45 dB when preamplifiers and automated acquisition are implemented.

[0052] The transceiver receptacle 10 of the embodiments of the present invention, and more specifically the cage 14 and bezel clip 31, can provide consistent shielding effectiveness even after the heatsink is removed and replaced four times. Accordingly, the transceiver receptacles according to the embodiments of the present invention are durable and reliable, in addition to providing higher shielding effectiveness.

[0053] It should be understood that the foregoing description is only illustrative of the present invention. Various alternatives and modifications can be devised by those skilled in the art without departing from the present invention. Accordingly, the present invention is intended to embrace all such alternatives, modifications, and variances that fall within the scope of the appended claims.

Claims

WHAT IS CLAIMED IS:

1. A receptacle comprising: a cage including a bezel opening and through holes; and a bezel clip that is attached to the cage at the bezel opening and that includes first bezel fingers and second bezel fingers; wherein the first bezel fingers are located along an inner surface of the cage; the second bezel fingers extend through the through holes such that outer finger portions of the second bezel fingers extend along an outer surface of the cage and inner finger portions of the second bezel fingers extend along the inner surface of the cage; and adjacent second bezel fingers have different lengths.

2. The receptacle of claim 1, wherein the second bezel fingers include a first finger, a second finger, and a third finger; each of the first finger and the third finger has a first length; and the second finger has a second length different from the first length.

3. The receptacle of claim 2, wherein the first and the second fingers are positioned immediately adjacent to each other; and the second and third fingers are positioned immediately adjacent to each other.

4. The receptacle of claim 1, wherein the second fingers includes bends that connect the outer finger portions and the inner finger portions.

5. The receptacle of one of claims 1-4, further comprising a connector that is mateable with a transceiver.

6. A cage comprising: four walls defining a bezel opening; and at least three holes in at least one of the four walls arranged in first and second rows; wherein adjacent holes of the at least three holes in a circumferential direction along the four walls are in different rows; the first row is a first distance from the bezel opening; and the second row is a second distance from the bezel opening different from the first distance.

7. A receptacle comprising: a substrate; a connector on the substrate; and the cage of claim 6 connected to the substrate and surrounding the connector.

8. The receptacle of claim 7, further comprising a bezel clip attached to the cage at the bezel opening.

9. The receptacle of claim 8, wherein the bezel clip includes first bezel fingers and second bezel fingers; the first bezel fingers are located along an inner surface of the cage; and the second bezel fingers extend through the at least three holes on the at least one of the four walls such that outer finger portions of the second bezel fingers extend along an outer surface of the cage and inner finger portions of the second bezel fingers extend along the inner surface of the cage.

10. The receptacle of claim 9, wherein adjacent ones of the second bezel fingers have different lengths.

11. The receptacle of claim 9 or 10, wherein the second bezel fingers include a first finger, a second finger, and a third finger; each of the first finger and the third finger has a first length; and the second finger has a second length different from the first length.

12. The receptacle of claim 11, wherein the first and the second fingers are positioned immediately adjacent to each other; and the second and third fingers are positioned immediately adjacent to each other.

13. The receptacle of claim 9, wherein the second fingers includes bends that connect the outer finger portions and the inner finger portions.

14. The receptacle of claim 13, wherein the bends of adjacent second bezel fingers are at different locations along lengths of the second bezel fingers.

15. A receptacle comprising: a cage including a bezel opening and through holes; and a bezel clip that is attached to the cage at the bezel opening and that includes first bezel fingers and second bezel fingers; wherein the first bezel fingers are located along an inner surface of the cage; the second bezel fingers includes bends that connect outer finger portions and inner finger portions and that allow the second bezel finger to extend through the through holes such that the outer finger portions extend along an outer surface of the cage and the inner finger portions extend along the inner surface of the cage; and the bends of adjacent second bezel fingers are at different locations along lengths of the second bezel fingers.

16. The receptacle of claim 15, wherein the second bezel fingers include a first finger, a second finger, and a third finger; each of the first finger and the third finger has a first length; and the second finger has a second length different from the first length.

17. The receptacle of claim 16, wherein the first and the second fingers are positioned immediately adjacent to each other; and the second and third fingers are positioned immediately adjacent to each other.

18. The receptacle of claim 15, wherein the adjacent second bezel fingers have different lengths.

19. The receptacle of one of claims 15-18, further comprising a connector that is mateable with a transceiver.

20. A bezel clip comprising first bezel fingers and second bezel fingers, wherein the first bezel fingers have a same or substantially a same length, adjacent second bezel fingers have different lengths, and each of the second bezel fingers is longer than each of the first bezel fingers.

21. A bezel clip comprising first bezel fingers and second bezel fingers, wherein the first bezel fingers have a same or substantially a same length, adjacent second bezel fingers include bends that are located at different lengths along lengths of the second bezel fingers, and each of the second bezel fingers is longer than each of the first bezel fingers.