Patent Publication Number: US-2023156951-A1

Title: Adapter for aircraft wireless module

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit of India Provisional Patent Application 202141052524, filed Nov. 16, 2021, titled ADAPTER FOR AIRCRAFT WIRELESS MODULE, naming Curtis J Wicks, Rameshkumar Balasubramanian, Ryan Kollman, and Stephen Welch as inventors, which is incorporated herein by reference in the entirety. 
     TECHNICAL FIELD 
     The present invention generally relates to circuit card assemblies, and more particularly to adapters for wireless module expansion cards. 
     BACKGROUND 
     Wavelength availability, processing capabilities, embedded sensors are drivers in connecting devices by wireless communication networks. Wireless data communication has also proven to be a means of data communication within an aircraft. The aircraft may include hosts which communicate by a wireless interface. Transmission signals for the wireless interface may be modulated by an embedded wireless chip. The embedded wireless chips may provide a compact design which integrates to an avionics host. However, the embedded wireless chips may suffer from an inability to modify the wireless chip after embedding (e.g., for updating legacy avionics hosts). Furthermore, the circuit card assemblies of the host system that need to implement wireless interface need to be redesigned to accommodate the embedded wireless chip and its interfacing electronic circuits. Implementation of the embedded wireless chip may also point design leading to higher development, qualification, and certification cost for the host circuit card assembly. 
     The transmission signals for the wireless interface may also be modulated by a detachable expansion card. Referring now to  FIG.  1   , a prior art expansion card  100  is described. The expansion card  100  may be self-contained and interface with the host CCA through an edge connector  102  with a standard card interface, such as PCI, PCIe, or an M.2 form factor. The expansion card may be horizontally or vertically mounted to a socket of the host CCA. The expansion card may further include one or more radios (e.g., a WI-FI radio  104 , a Bluetooth low energy radio  106 , etc.), integrated sensors  108 , memory  110 , electrical components  112 , one or more coaxial radio frequency (RF) connectors  114 , and electromagnetic (EMI) shielding (not depicted). Such radios may also be referred to as radio frequency modules. A number of such expansion cards are commercially-off-the-shelf (COTS). The expansion card may also be referred to as a wireless module. In some instances, the electrical components  112  may implement a real-time clock function. The real-time clock function may provide a real-time clock output for compliance with wireless security protocol and encryption. 
     Some legacy avionics hosts may not include an interface for directly hosting the expansion card, such as non-networked circuit card assemblies (CCA) for various mechanical devices. Even where the host circuit card assemblies do include a suitable interface for receiving the expansion card, coupling the expansion card with the host circuit card assembly may prove difficult given one or more of the location or orientation of the interface in the host circuit card assembly. Such difficulty may arise due to clearance issues (e.g., components populated on the host CCA, etc.) associated with mounting the expansion card to the interface of the host CCA within the host chassis. In some instances, the legacy avionics host may accommodate the wireless network adapter card with additional modifications to the host assembly or the circuit card assembly. However, such changes may prove cost and time ineffective. Therefore, it would be advantageous to provide one or more of a device, system, or method that cures the shortcomings described above. 
     SUMMARY 
     Embodiments of the present disclosure are directed to a circuit card assembly adapting a host circuit card assembly of a host device with an expansion card for communication to an access point of an avionics network. In one embodiment, the circuit card assembly includes a circuit card. In another embodiment, the circuit card includes a first side, a second side, and a plurality of mounting holes for mounting the circuit card assembly to a host chassis of the host device. In another embodiment, the circuit card assembly includes a first interface disposed on the first side of the circuit card for receiving power from the host circuit card assembly. In another embodiment, the circuit card assembly includes a battery disposed on the first side of the circuit card. In another embodiment, the circuit card assembly include a second interface disposed on the first side of the circuit card for receiving an edge connector of the expansion card. In another embodiment, the power is continually provided to the second interface for powering a real-time clock of the expansion card. In another embodiment, a source of the power continually provided to the second interface is selected from the first interface and the battery based on an availability of the power from the first interface. In another embodiment, the second interface is a socket connector. In another embodiment, the circuit card assembly includes at least one coaxial radio frequency connector disposed on the first side of the circuit card for receiving a modulated radio frequency signal modulated by a radio-frequency module of the expansion card. In another embodiment, the circuit card assembly includes an antenna disposed on the second side of the circuit card and communicatively coupled to the at least one coaxial radio frequency connector. In another embodiment, the antenna transmits radio waves based on the modulated radio frequency signal. 
     Embodiments of the present disclosure are also directed to a system for communication to an access point of an avionics network. In one embodiment, the system includes a host device. In another embodiment, the host device includes a host chassis and a host circuit card assembly fixed to the host chassis. In another embodiment, the host circuit card assembly receives aircraft electrical power. In another embodiment, the system includes an expansion card. In another embodiment, the expansion card includes an edge connector, a real-time-clock, a radio-frequency module, and a first coaxial radio frequency connector. In another embodiment, the radio frequency is configured to generate a modulated radio frequency signal. In another embodiment, the modulated radio frequency signal is output by way of the first coaxial radio frequency connector. In another embodiment, the system includes a coaxial cable. In another embodiment, the system includes a circuit card assembly. 
     In another embodiment, the circuit card assembly includes a circuit card including a first side, a second side, and a plurality of mounting holes by which the circuit card is mounted to the host chassis. In another embodiment, the circuit card assembly includes a first interface disposed on the first side of the circuit card for receiving power from the host circuit card assembly. In another embodiment, the circuit card assembly includes a battery disposed on the first side of the circuit card. In another embodiment, the circuit card assembly includes a second interface disposed on the first side of the circuit card for receiving the edge connector of the expansion card, wherein power is continually provided to the socket connector for powering the real-time clock of the expansion card, wherein the power is selectively provided from one of the first interface and the battery based on an availability of the power from the first interface. In another embodiment, the circuit card assembly includes a second coaxial radio frequency connector disposed on the first side of the circuit card, wherein the first coaxial radio frequency connector and the second coaxial radio frequency connector are coupled by the coaxial cable such that the second coaxial radio frequency connector receives the modulated radio frequency signal from the radio-frequency module of the expansion card. In another embodiment, the circuit card assembly includes an antenna disposed on the second side of the circuit card and communicatively coupled to the at least one coaxial radio frequency connector, the antenna transmitting radio waves based on the modulated radio frequency signal. 
     Further Contemplations 
     Embodiments of the present disclosure are directed to a circuit card assembly adapting a host circuit card assembly of a host device for communication to an access point of an avionics network. In one embodiment, the circuit card assembly includes a circuit card. In another embodiment, the circuit card includes a first side, a second side, and a plurality of mounting holes for mounting the circuit card assembly to a host chassis of the host device. In another embodiment, the circuit card assembly includes a first interface disposed on the first side of the circuit card for receiving power and an unmodulated signal from the host circuit card assembly. In another embodiment, the circuit card assembly includes a radio disposed on the first side of the circuit card. In another embodiment, the power is continually provided to the radio for powering a real-time clock of the radio. In another embodiment, the radio executes a function causing the radio to generate a modulated radio frequency signal. In another embodiment, the circuit card assembly includes an antenna disposed on the second side of the circuit card and communicatively coupled to the radio. In another embodiment, the antenna transmits radio waves based on the modulated radio frequency signal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the inventive concepts disclosed herein may be better understood when consideration is given to the following detailed description thereof. Such description makes reference to the included drawings, which are not necessarily to scale, and in which some features may be exaggerated and some features may be omitted or may be represented schematically in the interest of clarity. Like reference numerals in the drawings may represent and refer to the same or similar element, feature, or function. In the drawings: 
         FIG.  1    depicts an expansion card, in accordance with the prior art. 
         FIG.  2 A  depicts a top view of a circuit card assembly, in accordance with one or more embodiments of the present disclosure. 
         FIG.  2 B  depicts a bottom view of a circuit card assembly, in accordance with one or more embodiments of the present disclosure. 
         FIG.  2 C  depicts a bottom view of a circuit card assembly, in accordance with one or more embodiments of the present disclosure. 
         FIG.  3 A  depicts a simplified schematic of a system, in accordance with one or more embodiments of the present disclosure. 
         FIG.  3 B  depicts a simplified schematic of a system, in accordance with one or more embodiments of the present disclosure. 
         FIG.  3 C  depicts a side plan view of a system, in accordance with one or more embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Before explaining at least one embodiment of the inventive concepts disclosed herein in detail, it is to be understood that the inventive concepts are not limited in their application to the details of construction and the arrangement of the components or steps or methodologies set forth in the following description or illustrated in the drawings. In the following detailed description of embodiments of the instant inventive concepts, numerous specific details are set forth in order to provide a more thorough understanding of the inventive concepts. However, it will be apparent to one of ordinary skill in the art having the benefit of the instant disclosure that the inventive concepts disclosed herein may be practiced without these specific details. In other instances, well-known features may not be described in detail to avoid unnecessarily complicating the instant disclosure. The inventive concepts disclosed herein are capable of other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting. 
     As used herein a letter following a reference numeral is intended to reference an embodiment of the feature or element that may be similar, but not necessarily identical, to a previously described element or feature bearing the same reference numeral (e.g., 1, 1a, 1b). Such shorthand notations are used for purposes of convenience only, and should not be construed to limit the inventive concepts disclosed herein in any way unless expressly stated to the contrary. 
     Further, unless expressly stated to the contrary, “or” refers to an inclusive or and not to an exclusive “or”. For example, a condition A or B is satisfied by anyone of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present). 
     In addition, use of the “a” or “an” are employed to describe elements and components of embodiments of the instant inventive concepts. This is done merely for convenience and to give a general sense of the inventive concepts, and “a” and “an” are intended to include one or at least one and the singular also includes the plural unless it is obvious that it is meant otherwise. 
     Finally, as used herein any reference to “one embodiment,” or “some embodiments” means that a particular element, feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the inventive concepts disclosed herein. The appearances of the phrase “in some embodiments” in various places in the specification are not necessarily all referring to the same embodiment, and embodiments of the inventive concepts disclosed may include one or more of the features expressly described or inherently present herein, or any combination or sub-combination of two or more such features, along with any other features which may not necessarily be expressly described or inherently present in the instant disclosure. 
     Embodiments of the present disclosure are generally directed to a circuit card assembly. The circuit card assembly may act as a wireless interface for a host circuit card assembly. The circuit card assembly provides flexibility in mounting an expansion card to the host circuit card assembly in a selected location or orientation. The circuit card assembly may provide such flexible mounting with minimal modification to the host chassis. In this regard, the circuit card assembly may be considered to an adapter which adapts the host circuit card assembly with the expansion card. 
     Referring now to  FIG.  2   , a circuit card assembly  200  is described, in accordance with one or more embodiments of the present disclosure. The circuit card assembly  200  may include, but is not limited to, one or more of a circuit card  202 , an interface  204  to connect with the host device, an interface  206  to connect with the expansion card, a battery  208 , a coaxial radio frequency (RF) connector  210 , an antenna  212 , or a radome  314 . In some instances, the circuit card assembly  200  may be considered as an adapter, an integrated antenna adapter (IAA), or a wireless interface for a host CCA. The circuit card assembly  200  may enable a host device to wireless interface with an avionics network. 
     The circuit card  202  of the circuit card assembly  200  may include a substrate and one or more integrated circuits provided on the substrate. The circuit card  202  may also include one or more mounting holes  216 . The mounting holes  216  may be of a size for receiving and fastening the circuit card assembly  200  to a host device, as will be described further herein. The circuit card  202  may also include a mounting hole  218 . The mounting hole may be at a distance from the interface  206 . The distance may be selected such that the distance is substantially equal to a distance between the edge connector  102  of the expansion card  100  and a mounting hole of the expansion card. The mounting hole  218  may be of a size for receiving a mounting screw. In this regard, the expansion card  100  may be fastened to the circuit card assembly  200 . The circuit card  202  may also include a cable clip  220 . One or more components of the circuit card assembly  200  may also be mounted on the circuit card  202 . Such components may be communicatively coupled by a trace  222  of the circuit card  202 . The specific routing of the trace  222  is not depicted. 
     The circuit card assembly  200  may further include the interface  204 . The interface  204  may be coupled to a first side of the circuit card  202 . The interface  204  may provide an interface between the circuit card assembly  200  and a host device. In particular, the interface  204  may provide connectivity to the host device. The interface  204  may be configured to receive a board-to-board connection or a cable connection to the host device. A number of known connectors may be suitable for providing the interface  204 , such as, but not limited to, a plug connector, a socket connector, or a board-to-board connector. For example, the interface  204  may include, but is not limited to, a pin header such as a 20-pin socket connector or a 20-pin plug connector. As may be understood, a number of connectors are known in the art which may be suitable for the interface  204 . The interface  204  may cause the circuit card assembly  200  to receive power from the host device. For example, the power received may be received from the host device in the form of 24 VDC or 28 VDC. The power may further be provided from the interface  204  to the interface  206  for powering the expansion card  100 . 
     In some embodiments, baseband signals from the host device are received by way of the interface  204 . Such baseband signals may be indicative of sensor data from the host device. The baseband signals may be communicated from the interface  204  to the interface  206 , by way of one or more communication lines (not depicted). This information may then be processed and modulated by the expansion card  100  into a modulated RF signal for wireless transmission according to a wireless protocol. 
     The circuit card assembly  200  may further include the interface  206 . The interface  206  may be coupled to the first side of the circuit card  202 . The interface  206  may be configured to receive and host an edge connector of the expansion card  100 . The interface  206  may include any suitable interface for receiving the expansion card  100 . A number of known connectors may be suitable for providing the interface  206 . For example, the interface  206  may include, but is not limited to, a PCI connector, a PCIe connector, or a mini-PCIe connector, or an M.2 connector. Power may be continually provided to the interface  206  such that the expansion card  100  may power a real-time clock of the expansion card  100 . A source of the power continually provided to the interface  206  is selected from the interface  204  and the battery  208  based on an availability of the power from the interface  204 . In this regard, the aircraft power may include power cycles. By selectively providing the power based on availability, the real-time clock of the expansion card  100  may retain time information between power cycles of the host device. The power may be selectively provided in a number of suitable methodologies, such as, but not limited to, a power-switch circuitry (not depicted) of the circuit card assembly  200 . In some instances, the power-switch is implemented by the interface  204  which acts as an I/O connector. 
     The power provided to the interface  206  may also cause the expansion card  100  to perform the various radio functions. Thus, although the circuit card assembly  200  may not perform wireless module functions directly, the circuit card assembly  200  may support the wireless module functions for the host device by way of the expansion card  100 . The wireless module functions supported may include a radio-frequency module (e.g., radio) of the expansion card  100 . In this regard, the circuit card assembly  200  may support radio integration by way of the interface  206 . In some embodiments, the interface  206  may further cause the signals received from the host device by way of the interface  204  to be transmitted to the expansion card  100 . 
     The circuit card assembly  200  may also include the battery  208 . The battery  208  may be coupled to the first side of the circuit card  202 . Power from the battery  208  may be selectively transmitted to the interface  206  based on the availability of the aircraft or host power received by the interface  204 . By selectively providing the power from the battery  208 , a lifetime of the battery  208  may be extended before requiring replacement. The battery  208  may include any battery known in the art, such as, but not limited to button cell or coin cell. 
     The circuit card assembly  200  may also include the coaxial radio frequency connectors  210 . The coaxial radio frequency connectors  210  may be coupled to the first side of the circuit card  202 . By the coaxial radio frequency connectors  210  and the interface  206  being coupled on the same side of the circuit card  202 , a length of coaxial cable needed to connect the expansion card  100  to the coaxial radio frequency connectors  210  may be reduced. The coaxial radio frequency connectors  210  may receive modulated radio frequency signals from the expansion card  100 . The coaxial radio frequency connectors  210  may further transmit the signal received from the expansion card to the antenna  212 . Thus, the coaxial radio frequency connectors  210  provide connectivity between the expansion card  100  and the antenna  212 . 
     The coaxial radio frequency connectors  210  may include any coaxial radio frequency connector known in the art, such as, but not limited to a U.FL connector. The coaxial radio frequency connectors  210  may be surface mounted male connectors. The coaxial radio frequency connectors  210  may further include a given diameter, such as, but not limited to a 2 mm diameter. The coaxial radio frequency connectors  210  may also be configured to receive and transmit signals up to 6 GHz. 
     The circuit card assembly  200  may also include the antenna  212 . The antenna  212  may be coupled to a second side of the circuit card  202 . By being disposed on the second side of the circuit card  202 , antenna  212  may be separated from the expansion card  100 . Such separation may allow the antenna  212  to have a compact profile relative to the circuit card  202 . In particular, the circuit card assembly  200  may be coupled to an interior side a host chassis of the host device with minimal modifications to the host chassis. Furthermore, radiation from the antenna  212  may be shielded from the expansion card  100 . 
     The antenna  212  may also be considered an integrated antenna. The antenna of the circuit card assembly  200  reduces the need of antenna selection and qualification by the host device manufacturer. The antenna  212  may include, but is not limited to, a surface mounted antenna, a through-hole mounted antenna, or a printed or etched microstrip antenna. 
     The antenna  212  may transmit radio waves based on the modulated signal received from the expansion card  100  by way of the coaxial radio frequency connectors  210 . As may be understood, wireless interfaces may operate in the ISM (Industrial, Scientific, and Medical) frequency band (2.4 GHz and/or 5 GHz) and/or the Wireless Avionics Intra-communication (WAIC) frequency band (4.2 GHz) for communication with aircraft networks. Such waveforms may further be implemented according to various protocols, such as, but not limited to, Wi-Fi (IEEE 802.11) protocols, Bluetooth (IEEE 802.15.x) protocols, or Cellular (GSM, CDMA, LTE etc.) protocols. The radio waves may cause the circuit card assembly  200  to communicate with a wireless access point of the avionics network. Such communication may include signals received from the host device and/or signals based on sensors within the expansion card  100 . By implementing the antenna  212  in the circuit card assembly  200 , the designers of the host device may not need to certify the host device for radio frequency functions. 
     In some embodiments, the circuit card assembly  200  may maintain high voltage isolation when integrating with the host device or the expansion card  100 . For example, the antenna  212  may include a ground plane (not depicted). The ground plane may generally include a plane of conductive material. A size of the ground plane may be selected to prevent radiation (e.g., the radio waves emitted by the antenna  212 ) from reaching the expansion card  100 . Thus, the expansion card  100  (or various components of the host device) may be shielded from radiation. Said ground plane may be coupled to a ground wire of the antenna  212 . 
     As depicted in  FIG.  2 B , the circuit card assembly  200  may include one of the antennas  212 . The signals received from both of the coaxial radio frequency connectors  210  may be multiplexed by a multiplexer (not depicted) of the circuit card assembly  200 . The multiplexer may multiplex the modulated radio frequency signals received by both of the coaxial radio frequency connectors  210  (see  FIG.  2 A ) into a multiplexed signal. The antenna  212  may then transmit the radio waves based on the multiplexed signal. 
     As depicted in  FIG.  2 C , the circuit card assembly  200  may include two of the antennas  212 . Each of the antennas  212  may be communicatively coupled to one of the coaxial radio frequency connectors. The first and second antennas may then transmit radio waves based on the modulated signals received from the associated radio frequency connector. In this regard, no multiplexer may be required to multiplex the signals for transmission by way of one antenna. 
     In some embodiments, the circuit card assembly  200  may further include a radome (see  FIG.  3 C , for example). The radome may cover the antenna  212  to protect the antenna  212  from external damage. The radome may be transmissible to the radio waves transmitted by the antenna  212 . For example, the radome may include a plastic material selected for RF transmissivity with minimal attenuation, such as, but not limited to, polyethereimide (e.g., Ultem™). In some instances, the radome provides a weather proof seal. For example, the radome may include a gasket connection with the host enclosure  302 . 
     Referring now to  FIGS.  3 A- 3 C , a system  300  is described, in accordance with one or more embodiments of the present disclosure. The system may include the expansion card  100 , circuit card  202 , a host device  301 , and one or more coaxial cable  310 . In this regard, the circuit card  202  and the expansion card  100  may serve as a wireless interface allowing communication between the host device  301  and an access point of an avionics network. By integrating the circuit card assembly  200  with the host device  301 , the host device  301  may not need to be certified for communication over the avionics network. The modular nature of the expansion card  100  may include a form factor suitable for the host device  301 , thereby reducing costs for development, integration, qualification, and certification. This may be advantageous for implementing the wireless interface to the avionics network in existing host devices. Thus, the circuit card assembly  200  may implement a modular and flexible wireless adapter to host commercially-off-the-shelf (COTS) wireless modules in the host device  301 . 
     The circuit card  202  may adapt the host device  301  with the expansion card  100 . The circuit card  202  may receive the expansion card  100  by the interface  206  receiving the edge connector  102 . The expansion card  100  may then be fastened to the wireless adapter by the mounting screw  318  and the mounting hole  218 , thereby substantially preventing vibration of the expansion card  100 . The coaxial RF connectors  210  of the circuit card  202  may be coupled to the coaxial RF connectors  114  of the expansion card  100  by way of the coaxial cable  310 . The radio functions of the expansion card  100  may thus cause modulated radio frequency signal to be output to the circuit card  202  by way of the coaxial cable  310 , the coaxial RF connector  114 , and the coaxial RF connector  210  (e.g., for subsequent transmission by the antenna). 
     The host device  301  may include any avionics host device known in the art, such as, but not limited to, a galley component (e.g., water heaters, coffee makers, ovens, refrigerator, etc.), a cabin component (e.g., cabin lighting, passenger service units, speakers, flight deck surveillance systems, etc.), a seating component (e.g., a seat control unit, passenger compartment controller, etc.), or other suitable device coupled to aircraft power. The host device  301  may include one or more of a host chassis  302 , a power supply  304 , and a host circuit card assembly  306 . 
     The host device  301  may include the host chassis  302 . The host chassis  302  may include any material known in the art. In some instances, the host chassis  302  may include an EMI resistant material, such as metal. In this regard, the host chassis  302  may act as an EMI shield for the host circuit card assembly. In other instances, the host chassis  302  may include a non-EMI resistant material, such as plastic. The host chassis  302  may be modified to include an aperture (not depicted). The aperture may permit transmission of the radio waves. The aperture may provide the antenna  212  of the circuit card assembly  200  with a transmission region by which radio waves may be transmitted to transmit to the avionics network. The aperture may be selected with a given size suitable for the radio waves. In some embodiments, the aperture is selected based on the size of the antenna  212 . For example, the aperture may include a square or round hole with dimensions selected based on the dimensions of the antenna  212  (e.g., a square hole with a width of 1.5 inches). Thus, the antenna  212  may radiate outside of the host chassis  302 . The introduction of the aperture to the host chassis  302  may also permit external radio waves to pass through the aperture. In some instances, the external radio waves are absorbed by the ground plane of the antenna  212 , thereby preventing interference with the host circuit card assembly  306  and the expansion card  100 . 
     The circuit card assembly  200  may be mounted to the interior of the host chassis  302 . The circuit card assembly  200  may be mounted to the interior of the host chassis  302  in any orientation that supports the installation. For example, where the host circuit card assembly  306  and the circuit card assembly  200  are connected by a cable interconnect, the cable may be flexible run from the host circuit card assembly  306  to the desired mounting location for the circuit card assembly  200 . By way of another example, where the host circuit card assembly  306  and the circuit card assembly  200  are board-to-board connected, the circuit card assembly  200  may be mounted to the interior of the host chassis  302  in a suitable orientation based on the board-to-board connection. 
     The host device  301  may also include a power supply  304 . The power supply  304  may include any suitable power supply known in the art. In this regard, any distributed or local power supply that provides conditioned power suitable for implementation in the context of avionics (e.g., 28 VDC) capable of meeting the requirements of the host device  301  may be implemented. In some instances, the power from the power supply  304  includes a duty or power cycle based on the type of the host device  301 . 
     The host device  301  may also include the host circuit card assembly  306 . The host circuit card assembly  306  may include any host circuit card assembly known in the art. The host circuit card assembly  306  may be mounted to the host chassis  302 . In some instances, the circuit card assembly  200  may be mounted to the host circuit card assembly  306  by one or more standoffs. 
     The host circuit card assembly  306  may also be communicatively coupled to the circuit card assembly  200 . The host circuit card assembly  306  may include an interface. The interface may communicatively couple the host circuit card assembly  306  with the circuit card assembly  200 . The interface may include any interface, such as, but not limited. a plug connector, a socket connector, or a board-to-board connector. In some embodiments, the interface  204  and the interface are coupled by a cable  308 . The cable  308  may include any cable known in the art, such as, but not limited to, a pigtail connector, a cable connector, a cable harness, or other suitable cable. The cable may be selected based on the interface of the host circuit card assembly  306 .The circuit card assembly  200  may include multiple mounting locations within the host chassis  302 . By the cable, the circuit card assembly  200  is flexible in mounting location and orientation for both forward-fit and retro-fit installations within the chassis  302 . In some embodiments, the interface  204  and the interface are coupled by a board-to-board connection (not depicted) without a cable. 
     In some embodiments, the host circuit card assembly  306  may output power from the power supply  304  to the circuit card assembly  200 . The power may be output by way of the interface. The circuit card assembly  200  may then selectively provide power to the expansion card  100  for persistently preserves time between power cycles of the aircraft power received. As may be understood, the system  300  may include a number of the host device  301  on the aircraft. In this regard, such host devices may not include a physical network interface but may include aircraft power. An ability to wireless interface the host device  301  with the aircraft network by way of the circuit card assembly  200  may be desirable. 
     In some embodiments, the host circuit card assembly  306  may output baseband signals to the circuit card assembly  200 . The baseband signals may include real-time clock data. Such real-time clock data may be provided to the expansion card  100  for time-synchronization with the real-time clock of the expansion card  100 . The baseband signals may also include sensor data from the host device  301 . The host circuit card assembly  306  may also include more than one of the interfaces. For example, a first interface may provide the power and a second interface may provide the baseband sensor signal. 
     Referring now to  FIG.  3 B , the system  300  may further include an antenna  312 . The antenna may be mounted to an exterior of the host chassis  302 . The antenna  312  may include any antenna, such as, but not limited to, a patch antenna or a whip antenna. The antenna  312  may be coupled to one of the coaxial radio frequency connectors  210  by way of the coaxial cable  310 . Thus, the antenna  312  and the antenna  212  may transmit the radio waves to the wireless aircraft network. 
     Referring now to  FIG.  3 C , the system  300  may further include a radome  314 . The radome  314  may cover the antenna  212  to protect the antenna  212  from external damage. The radome may be transmissible to the radio waves transmitted by the antenna  212 . For example, the radome may include a plastic material selected for RF transmissivity with minimal attenuation, such as, but not limited to, polyethereimide (e.g., Ultem™). In some instances, the radome provides a weather proof seal. For example, the radome may include a gasket connection with the host enclosure  302 . 
     The host chassis  302  may include an aperture. The circuit card assembly  200  may be mounted to the host chassis such that the antenna  212  transmits the radio waves through the aperture. For example, the antenna may be disposed within the aperture. The radome  314  may also cover the aperture. 
     The system  300  may also include one or more standoffs  316 . The standoffs  316  may couple one or more of the circuit card assembly  200 , the host circuit assembly  306 , the host chassis  302 , and the radome  314 . 
     Referring generally again to  FIGS.  1 A- 3 C . 
     As previously described, the circuit card assembly  200  may adapt the host circuit card assembly  306  with the expansion card  100 . It is further contemplated that the circuit card assembly  200  may include one or more radio functions embedded within the circuit card assembly  200 , such that the expansion card  100  is not necessary. In this regard, although the circuit card assembly  200  is described as including one or more of an interface  206  and a coaxial radio frequency connector  210 , this is not intended as a limitation on the present disclosure. In some embodiments, the circuit card assembly  200  may include the circuit card  202 , the interface  204 , the antenna  212 . The circuit card assembly  200  may further include a radio disposed on the first side of the circuit card  202 . The radio may be coupled to the interface  204  for receiving power and various unmodulated signals. The radio may be configured to generate modulated radio frequency signals by executing a radio modulation functions. The radio may also be communicatively coupled to the antenna  212 , causing the antenna  212  to transmit radio waves based on the modulated radio frequency signal. 
     From the above description, it is clear that the inventive concepts disclosed herein are well adapted to carry out the objectives and to attain the advantages mentioned herein as well as those inherent in the inventive concepts disclosed herein. While presently preferred embodiments of the inventive concepts disclosed herein have been described for purposes of this disclosure, it will be understood that numerous changes may be made which will readily suggest themselves to those skilled in the art and which are accomplished within the broad scope and coverage of the inventive concepts disclosed and claimed herein.