Patent Publication Number: US-10334082-B2

Title: Extremely high frequency converter

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation of U.S. patent application Ser. No. 15/225,814, filed on Aug. 1, 2016, entitled “Extremely High Frequency Converter,”, now U.S. Pat. No. 9,832,288, which is a continuation of U.S. patent application Ser. No. 14/280,508, filed on May 16, 2014, entitled “Extremely High Frequency Converter,”, now U.S. Pat. No. 9,407,731, which claims the benefit under 35 U.S.C. § 119(e) of the filing date of U.S. Provisional Patent Application No. 61/824,293, filed on May 16, 2013, entitled “Modular Protocol Dongles,” each of which is hereby incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The disclosure relates to protocol converters and combinable electronic devices. More particularly, the disclosure relates to extremely high frequency protocol converters and combinable devices. 
     BACKGROUND 
     Advances in semiconductor manufacturing and circuit design technologies have enabled the development and production of integrated circuits (ICs) with increasingly higher operational frequencies. In turn, electronic products and systems incorporating such integrated circuits are able to provide much greater functionality than previous generations of products. This additional functionality has generally included the processing of increasingly larger amounts of data at increasingly higher speeds. 
     The processing of increasingly large amount of data involves converting and communicating the data into different protocols which are acceptable to individual interconnected devices. For example, a remote device that communicates data in a first protocol having an associated connector design may access a host device that uses data in a second protocol having a different connector design. Moreover, with the abundance of different types of interconnected devices, the number of data protocols commonly used is increasing. 
     To overcome the above stated problem of different data protocols, protocol converters are used, generally in the form of cables having embedded chips that convert between the two protocols and provide a connector for each protocol on the ends of the cable for connecting to devices having the respective protocols. 
     BRIEF SUMMARY 
     In a first example, a first extremely high frequency (EHF) protocol converter may be provided. The first EHF protocol converter may include at least a first transducer, at least a first EHF communication circuit, a protocol conversion circuit and a circuit port. The first transducer may be configured to convert between a first electromagnetic EHF data signal and a first electrical EHF signal. The first EHF communication circuit may be configured to convert between a first baseband data signal and the first electrical EHF signal. The protocol conversion circuit may be adapted to convert between the first baseband data signal when the first baseband data signal has data formatted according to a first data protocol associated with a first external device and a second baseband data signal having data formatted according to a second data protocol. The second data protocol may be different from the first data protocol. The circuit port may be coupled to the protocol conversion circuit for conducting the second baseband data signal relative to a second external device which is configured to operate with the second baseband data signal. 
     In a second example, an EHF protocol converter assembly may be provided. The EHF protocol converter assembly may include a plurality of EHF protocol converters. Each of the EHF protocol converters may include at least one respective transducer, at least a first and a second dielectric channel portions with each dielectric channel portion electromagnetically coupled with one of the at least one respective transducer, an EHF communication circuit, a protocol conversion circuit and a circuit port. The protocol conversion circuit of each EHF protocol converter may be adapted to convert between a respective first baseband data signal having data formatted according to a first data protocol and a respective other baseband data signal having data formatted according to a respective other data protocol different than the first data protocol. Each EHF protocol converter may be mechanically attached to another one of the plurality of EHF protocol converters. A first external surface of one of the plurality of EHF protocol converters may be matingly received by a second external surface of another one of the plurality of EHF protocol converters. 
     In a third example, a first EHF device may be provided. The first EHF device may include at least a first transducer, at least a first EHF communication circuit, a first dielectric channel portion and a second dielectric channel portion. The first and second dielectric channel portions may be electromagnetically coupled with a transducer of the at least a first transducer. The first transducer may be configured to convert between a first electromagnetic EHF data signal and a first electrical EHF signal. The first EHF communication circuit may be configured to convert between a first baseband data signal and the first electrical EHF signal. The first dielectric channel portion may have a first end configured as a first electromagnetic signal port associated with a first external surface of the first EHF device for conveying the electromagnetic EHF data signal between the first dielectric channel portion and an external electromagnetic EHF channel when the external electromagnetic EHF channel is coupled with the first electromagnetic signal port. The second dielectric channel portion may have a second end configured as a second electromagnetic signal port associated with a first external surface of the first EHF device. The first external surface may be spaced from the second external surface and may have a first surface configuration. The second external surface may have a second surface configuration configured to matingly receive an external surface of a communication device having the first surface configuration. 
     In a fourth example, an EHF device assembly may include a plurality of EHF devices. Each of the EHF device may include at least one respective transducer, at least a first and a second dielectric channel portions, and an EHF communication circuit. The first and the second dielectric channel portions may be electromagnetically coupled with one of the at least one respective transducer. Each EHF device may be mechanically attached to another one of the plurality of EHF device. A first external surface of one of the plurality of EHF devices may be matingly received by a second external surface of another one of the plurality of EHF devices. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Having thus described the invention in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein: 
         FIG. 1  illustrates a system for converting the formatting of data in a data signal from one data protocol to a different data protocol; 
         FIG. 2  is a simplified cross-sectional view of an EHF protocol converter assembly shown in  FIG. 1  and taken along line  2 - 2  in  FIG. 1 ; 
         FIG. 3  is a simplified exploded view of the EHF protocol converter assembly shown in  FIG. 1 ; 
         FIG. 4  is an isometric view showing a different view of an EHF protocol converter shown in  FIG. 1 . 
         FIG. 5  illustrates an example of an EHF protocol converter of an EHF protocol converter assembly; 
         FIG. 6  illustrates a further example of a EHF protocol converter of a EHF protocol converter assembly; and 
         FIG. 7  illustrates yet another example of an EHF protocol converter assembly connected to a representative host device. 
     
    
    
     There may be additional structures described in the description that are not depicted in the drawings, and the absence of such a drawing should not be considered as an omission of such design from the specification. 
     DETAILED DESCRIPTION 
     Embodiments described herein may utilize apparatus components and steps related to electronic devices capable of EHF communication, including close-proximity EHF communication. Accordingly, the apparatus components have been represented where appropriate by conventional symbols in the drawings, showing specific details that are pertinent for an understanding of the present disclosure so as not to obscure the disclosure with details that will be readily apparent to those with ordinary skill in the art having the benefit of the description herein. 
     Detailed embodiments are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the claimed elements, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the disclosed concepts in an appropriate structure. Further, the terms and phrases used herein are not intended to be limiting but rather to provide an understandable description of the subject matter. 
     Furthermore, in today&#39;s society and computing environment, electronic devices are being used increasingly. Methods and apparatus using EHF communication may provide secure, stable, and high-bandwidth communication between and within these devices. 
     The embodiments described utilize EHF communication circuits, including close-proximity EHF communication circuits. Where EHF communication is used in the following description, it should be understood that phrase includes close-proximity EHF communication. Examples of such communication circuits are known, as are described in detail in U.S. Patent Application Publication Nos. 2012/0307932, 2012/0263244, 2012/0286049, and 2013/0070817, all of which are hereby incorporated in their entireties for all purposes. 
     Communication may be used to provide signal communications between components or modules in a device or may provide communication between devices. Communication provides an interface that is not subject to mechanical and electrical degradation. Examples of systems employing communication between chips are disclosed in U.S. Pat. No. 5,621,913 and U.S. Published Patent Application No. 2010/0159829, the disclosures of which are incorporated herein by reference in their entirety for all purposes. 
     In one example, tightly-coupled transmitter/receiver pairs may be deployed with a transmitter disposed at a terminal or intermediate portion of a first conduction path and a receiver disposed at a terminal or intermediate portion of a second conduction path. The transmitter and receiver may be disposed in close proximity to each other depending on the strength of the transmitted energy, and the first conduction path and the second conduction path may be discontinuous with respect to each other. 
     A transmitter or receiver may be configured as an IC package, in which an antenna may be positioned adjacent to a die and held in place by a dielectric or insulating encapsulation or bond material. A transmitter or receiver may be configured as an IC package, in which an antenna may be positioned adjacent to a die and held in place by encapsulation material of the package and/or a lead frame substrate. 
     As is discussed further below, these communication circuits may be used to create separate electronic devices that can thus transfer data without contacts, each electronic device may be self-contained, and may be environment-proofed. Separate devices may be assembled and disassembled with ease, even by hand, as no complicated and/or easily-damaged connectors are used in assembly of a combination of the devices. The devices may be configured with magnets or clips to connect to each other in one or more configurations. In this fashion, different devices may be field-swapped as appropriate for a particular application. By using the EHF communication circuits to provide communication, relaxed device alignment requirements may be facilitated due to the relatively tolerant EHF coupling characteristics of the EHF communication link. Exposed metal for connectors on the devices may be eliminated as well, resulting in better wear characteristics and enabling capabilities such as waterproofing. 
       FIG. 1  illustrates simplistically a system  100  for converting standard or proprietary protocol accepted by a device to a protocol suitable for other devices or tools to achieve interoperability amongst the devices. The system  100  may include an EHF protocol converter assembly  102 , also referred to as an example of an EHF device assembly. The EHF protocol converter assembly  102  may include one or a plurality of EHF protocol converters, such as an EHF protocol converter  104 , an EHF protocol converter  106 , and an EHF protocol converter  108 . The EHF protocol converters as illustrated and described may also be referred to as EHF devices. 
     Each EHF protocol converter may include first and second spaced-apart external surfaces that are complementarily configured so that the first external surface of one EHF protocol converter is received matingly with the second external surface of another EHF protocol converter or other compatible device. The first and second surfaces may be disposed on different parts of the respective EHF devices. In the example shown, one of the surfaces is a bottom surface and the other is a top surface. For convenience, then, the terms “top” and “bottom” will be used to refer to these surfaces, it being understood that the surfaces may be in other relative positions and the orientation of the EHF devices forming an assembly may vary. 
     In the example shown, a lower external surface  112  of the EHF protocol converter  104  may be mechanically attached and matingly received by a top external surface  114  of the EHF protocol converter  106 . Similarly, a bottom external surface  116  of the EHF protocol converter  106  may be mechanically attached and matingly received by a top external surface  118  of the EHF protocol converter  108 . 
     In an embodiment, the EHF protocol converter assembly  102  may include an electromagnetic EHF conduit  120 . EHF conduit  120  may conduct an electromagnetic EHF signal from an electronic device  110 , using data formatted according to a specific protocol, to the one or more EHF protocol converters of assembly  102 . Each EHF protocol converter may also be connected to a respective other electronic device. In this example, EHF protocol converter  104  is connected to an electronic device  122  by a connecting cable  123 . Cable  123  may be permanently attached to EHF protocol converter  104  or it may connect using connections appropriate for the protocol of electronic device  122 . Similarly, EHF protocol converter  106  may be connected to an electronic device  124  by a connecting cable  125  have connectors associated with the protocol of electronic device  124 . Also, EHF protocol converter  108  may be connected to an electronic device  126  by a connecting cable  127  having conventional connectors on each end. In this example, EHF protocol converter  108  may include a cable  128  having a receptacle  129  at a distal end configured to receive a connector of cable  127 . Each EHF protocol converter may convert a data signal from the protocol of signals received or sent to electronic device  110  and the protocols of electronic devices  122 ,  124 ,  126  that are different than the protocol of electronic device  110 . The protocols of electronic devices  122 ,  124 ,  126  may be the same or some of the protocols may be different. 
       FIG. 2  is a simplified cross sectional view of the EHF protocol converter assembly  102  taken along the line  2 - 2  in  FIG. 1 . A slight amount of space is shown between the devices forming the assembly. These surface may also be in physical contact.  FIG. 3  is a simplified exploded view of the EHF protocol converter assembly showing the top surfaces of the EHF protocol converters, and  FIG. 4  is an isometeric view of EHF protocol converter  102  showing the bottom surface. EHF conduit  120  and the respective facing top and bottom surfaces of each of the EHF protocol converters  104 ,  106  and  108  may be mechanically interconnected, thereby providing alignment between dielectric channels (also shown by double-ended arrows in  FIG. 1 ) and illustrated by dashed lines in  FIG. 2 . The electromagnetic EHF conduit  120  may provide at least a dielectric first conduit channel  136  configured to convey electromagnetic EHF signals between electronic device  110  and the assembly of EHF protocol converters. 
     In an embodiment, the first conduit channel of electromagnetic EHF conduit  120  may include a terminal end  138  configured as a first conduit signal port  140 . The first conduit signal port  140  may be associated with a first conduit surface  142  of the electromagnetic EHF conduit  120  for conveying electromagnetic EHF signals between the first conduit channel  136  and a first channel or channel portion  202  of the first EHF protocol converter  104 . The conduit surface  142  may partially have a surface configuration conforming at least in part to the configuration of bottom surfaces of the EHF protocol converters, such as bottom surfaces  112 ,  116 , and may be matingly received, in this example, by the top external surface  130  of the EHF protocol converter  104 . The conduit signal port  140  may be aligned sufficiently with an electromagnetic signal port  204  of the EHF protocol converter  104  to provide coupling between the ports. EHF conduit  120  may connect to electronic device  110  by a similar terminal end having corresponding surface configurations that mate with a correspondingly complementary surface of the electronic device, or by an appropriate connector  144 . 
     In the embodiments shown, the top surfaces are configured with a groove or recess  146  and the bottom surfaces are configured with a ridge or protrusion  148  that can be matingly received in the complementary recess  146  of the top surface. Bottom surface  142  of EHF conduit  120  correspondingly has a protrusion  150  that at least partially conforms to protrusions  148  of the EHF protocol converters. It will be appreciated, then, that the bottom surface of any of EHF protocol converters  102 ,  104 ,  106 , and the bottom surface of electromagnetic EHF conduit  108  may interchangeably be matingly received in any of the top surfaces of the EHF protocol converters. The EHF protocol converter assembly may thus be composed of a combination of one or more EHF protocol converters in any order. 
     This complementary physical configuration of ridges and grooves may be utilized to mechanically attach the EHF protocol converter  104  with the EHF protocol converter  106  and the EHF conduit  120 . By utilizing this mechanical arrangement, a basic assembly of stacking the plurality of EHF protocol converters with the EHF conduit may be formed. Although stacking or layering of the EHF protocol converters is shown, it will be appreciated that other configurations of combining or assembling EHF protocol converters may be provided. It may be noted that different mechanical arrangements may be utilized to mechanically connect and align the multiple EHF protocol converters with one another and with the EHF conduit and may enable the conversion of data protocol. Other mechanical arrangements that enable mechanical alignment and interconnection may be utilized to form an EHF protocol converter assembly. 
     Further, a signal may be fed to the assembly by a electromagnetic EHF conduit  120 . Alternatively or additionally, a EHF protocol converter may be configured to receive an electromagnetic EHF signal directly from an external device  110  such as through a correspondingly configured surface of the external device or via a dielectric conduit, in addition to functioning as a protocol converter for yet a different device. For example, a EHF protocol converter assembly could be positioned on the top surface of electronic device  110 , eliminating the need for a separate communication link for the electromagnetic EHF signal as provided by EHF conduit  120 . 
     In an embodiment, the electromagnetic EHF data signal may conduct progressively through the EHF protocol converter  104 , the EHF protocol converter  106 , and the EHF protocol converter  108 , as represented by the double-ended arrows in  FIGS. 1 and 2 . 
     Referring now to  FIG. 5 , an embodiment of an EHF protocol converter  104  is shown in further detail in association with a single lane EHF conduit  120 . EHF protocol converters may each include a transducer, an EHF communication circuit, and a protocol conversion circuit to convert the electromagnetic EHF data signal from one data protocol to another data protocol. For example, the EHF protocol converter  104  may include a transducer  302 , which receives the electromagnetic EHF data signal. 
     In an embodiment, a first dielectric channel portion  310 , referred to as dielectric channel portion  202  in  FIG. 2 , may be electromagnetically coupled with the transducer  302 . The first dielectric channel portion  310  may have a first end  312  configured as a first electromagnetic signal port  314  associated with a top external surface  130  of the EHF protocol converter  104  for conveying the electromagnetic EHF data signal between the first dielectric channel portion  310  and an external electromagnetic EHF channel (providing electromagnetic EHF data signal from the electronic device  110  shown in  FIG. 1 ) when the external electromagnetic EHF channel is coupled with the first electromagnetic signal port  314 . 
     In an embodiment, a second dielectric channel portion  318  may have a second end  320  configured as a second electromagnetic signal port  322  associated with the bottom external surface  112  of the EHF protocol converter  104 . The first and second dielectric channel portions  310  and  318  may be part of a dielectric channel  323  that may extend continuously through the EHF protocol converter  104  between dielectric channel portions  310  and  318 . As discussed above, the bottom external surface  112  may be spaced from the upper external surface  130 . The bottom external surface  112  may have a bottom surface configuration  324  corresponding to ridge  148  and the top external surface  114  of EHF protocol converter  106 , like top external surface  130  of EHF protocol converter  104 , may have a top surface configuration  326 . The bottom surface configuration  324  may be configured to matingly receive the top external surface  114  of the EHF converter  106  having the top surface configuration  326 . 
     Each of the EHF protocol converter  104 , the EHF protocol converter  106 , and the EHF protocol converter  108  may strip off a respective portion of an electromagnetic EHF data signal being conducted with coupled dielectric channel and may convert the respective portion of the electromagnetic EHF data signal to a baseband signal having a data protocol suitable for correspondingly respective connected peripheral electronic device  122 , electronic device  124 , and electronic device  126 . 
     In an example for purposes of illustration, an electromagnetic EHF data signal transmitted by or received from electronic device  110 , which may be a computer or other device having a processor, and fed to the EHF protocol converter assembly  102  via EHF conduit  120 , may have a SATA or PCI Express (PCIe) protocol. The EHF protocol converter  104  may convert a corresponding portion of the electromagnetic EHF data signal to a USB protocol for sending the corresponding portion of the signal between the computer and a keyboard, mouse, external drive, or other computer accessory. The EHF protocol converter  106  may be connected to a monitor and may convert a corresponding portion of the electromagnetic EHF data signal to or from VGA, DVI-D, Display Port, or Thunderbolt protocols as required by the monitor. If the monitor is a TV, the protocol may be HDMI. The EHF protocol converter  106  may be connected to a LAN hub, such as a switch or router and may convert a corresponding portion of the electromagnetic EHF data signal to Ethernet protocol. Some devices also use a Firewire protocol. 
     In another embodiment, at least two of the EHF protocol converters may convert the electromagnetic EHF data signal in same protocols, such as to a keyboard and a computer mouse. 
     Transducer  302  may receive the electromagnetic EHF data signal and may convert the electromagnetic EHF data signal to an electrical EHF signal. Accordingly, an EHF communication circuit  304  may convert the electrical EHF signal to a baseband data signal. A protocol conversion circuit  306  may then convert the data format of the baseband data signal having a data formatted according to a data protocol associated with the electronic device  110  to a data format which may be acceptable to the electronic device  122 . For example, the protocol conversion circuit  306  may be adapted to convert between a first baseband data signal when the first baseband data signal has data formatted according to a first data protocol associated with the electronic device  110  and a second baseband data signal having data formatted according to a second data protocol (acceptable to the electronic device  122 ) different than the first data protocol. Following this, a circuit port  308  coupled to the protocol conversion circuit  306  may conduct the second baseband data signal to the electronic device  122  configured to operate with the second baseband data signal. 
     In an embodiment and referring to  FIGS. 5 and 6 , magnets and/or a pair of magnets  340  on the EHF protocol converter  104  may enable mechanical connection and alignment with the EHF protocol converter  106  and the EHF conduit  120 . That is, as shown, a pair of spaced magnets  340  may be disposed along top surface  130  and a pair of magnets  340  may be disposed along bottom surface  112  of EHF protocol converter  104 . In addition, complementary magnets  342  are distributed on the top and bottom surfaces of EHF protocol converter  106 , and magnets  344  may be distributed on the bottom surface of the EHF conduit  120 . The facing magnets may have polarities selected to cause the magnets them to be attracted together when the respective top and bottom surfaces of mating devices are aligned. It will be appreciated that a combination of magnet and ferrous element may also provide sufficient attraction to enable the mechanical inter-connection and alignment of the paired devices. Other devices may also be used to support the paired devices in a relative configuration that aligns the respective dielectric channels. 
       FIG. 6  illustrates another embodiment of an EHF protocol converter. In this example, there may be multiple lanes or dielectric channels of EHF signals in the EHF conduit  120 . Each lane may be associated with a different data protocol of associated baseband data signals. As explained above, baseband signals obtained from the EHF signals conducting through these different lanes may be converted into different data protocols by different EHF protocol converters. A first dielectric channel portion  420  of an EHF protocol converter  104 ′ may be electromagnetically coupled with a first transducer  402 . The first dielectric channel portion  420  may have a first end  422  configured as a first electromagnetic signal port  424  associated with a second external surface  130  of the EHF protocol converter  104 ′ for conveying the electromagnetic EHF data signal between the first dielectric channel portion  420  and the corresponding external electromagnetic EHF channel in an EHF conduit  120 ′. 
     In an embodiment, a second dielectric channel portion  426  may be electromagnetically coupled with a second transducer  410 . The second dielectric channel portion  426  may have a first end  428  configured as a second electromagnetic signal port  430  associated with a first external surface  112  of the EHF protocol converter  104 . 
     The first transducer  402  may be electromagnetically coupled with the first dielectric channel portion  420  and may be configured to convert between a first electromagnetic EHF signal and a first electrical EHF signal. Similarly, the second transducer  410  may be electromagnetically coupled with the second dielectric channel portion  426  and may be configured to convert between a second electromagnetic EHF signal and a second electrical EHF signal. A first EHF communication circuit  404  may convert between a first baseband data signal and the first electrical EHF signal. Similarly, a second EHF communication circuit  406  may be configured to convert between the first baseband data signal and the second electrical EHF signal. A signal router circuit  408  may be operatively coupled to the first and second EHF communication circuits  404  and  406  and a protocol conversion circuit  434  for routing the first baseband data signal between the first and second EHF communication circuits  404  and  406  and the protocol conversion circuit  434  for converting the protocol of the associated data signals as has been described. Following this, a circuit port  436  coupled to the protocol conversion circuit  434  may conduct the baseband data signal to the electronic device  122  configured to operate with the baseband data signal having the corresponding protocol. 
     In another embodiment, router  408  may also or alternatively direct a portion of the baseband signal received from one of the first and second EHF communication circuits to the other of the first and second EHF communication circuits for conveying the signal to other components in the EHF protocol converter assembly without converting the protocol. 
     In yet another embodiment, the EHF protocol converter  104 ′ may conduct the EHF signal through a continuous dielectric channel  440 . The subsequent EHF protocol converter (for example, the EHF protocol converter  106 ) may have a transducer that extends into a corresponding dielectric channel that is aligned sufficiently to couple an electromagnetic EHF signal from dielectric channel  440 , as shown in  FIG. 3 , or relay it using one or more transducers explained above. Each EHF protocol converter thus may be configured to have a single dielectric channel, separate dielectric channels, a continuous dielectric channel, or a plurality of continuous and/or discontinuous channels and channel portions. 
       FIG. 7  illustrates how an EHF protocol converter assembly  500  may appear when configured for consumer use. Similar to the description above relating to the EHF protocol converter assembly  102 , EHF protocol converter assembly  500  may include a plurality of EHF protocol converters, such as EHF protocol converters  502 ,  504 ,  506  stacked together. One EHF protocol converter, in this example, EHF protocol converter  506  receives a terminal end of an EHF conduit  508  that conveys an electromagnetic EHF signal from a host electronic device  510 , such as an electronic tablet or smartphone. The EHF protocol converter assembly then converts the protocol of the host electronic device as appropriate and distributes the protocol-converted data signals to respective electronic devices, not shown, via respective connecting cables  512 ,  514 ,  516 . 
     It will therefore be appreciated that EHF protocol converters and EHF protocol converter assemblies as described may provide essentially a modular design in which different protocol conversions may be provided. Such a configuration may provide flexibility in how the assembly is configured, may provide reliable contactless interfaces between mechanically interconnected assembly components, and is readily upgradable to changing protocols by the production of new EHF protocol converters rather than the entire assembly. 
     It is believed that the disclosure set forth herein encompasses multiple distinct inventions with independent utility. While each of these inventions has been disclosed in its preferred form, the specific embodiments thereof as disclosed and illustrated herein are not to be considered in a limiting sense as numerous variations are possible. Each example defines an embodiment disclosed in the foregoing disclosure, but any one example does not necessarily encompass all features or combinations that may be eventually claimed. Where the description recites “a” or “a first” element or the equivalent thereof, such description includes one or more such elements, neither requiring nor excluding two or more such elements. Further, ordinal indicators, such as first, second, or third, for identified elements are used to distinguish between the elements, and do not indicate a required or limited number of such elements, and do not indicate a particular position or order of such elements unless otherwise specifically stated.