Abstract:
An antenna assembly includes a antenna carrier having an antenna module receiving region. The antenna module includes an antenna and a radio frequency transceiver coupled to the antenna. The antenna carrier includes a passive tuning element situated adjacent to the module receiving region, the element exhibiting a length selected to cause the antenna to resonate at a predetermined frequency when the antenna module is placed in the module receiving region.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
   This application claims priority to and is a continuation of co-owned now abandoned U.S. patent application Ser. No. 10/715,936, filed Nov. 18, 2003, by Finn, Larry W., et al., entitled INFORMATION HANDLING SYSTEM INCLUDING PASSIVE RF TUNING CARRIER FOR WIRELESS MODULES, which is incorporated herein by reference in its entirety. 

   BACKGROUND 
   A continuing problem associated with IHSs and IHS components is limited mobility. It has become desirable to limit or eliminate cables and other immobilizing connection devices used to transmit and receive information from system to system or within the system itself. 
   As the value and use of information continue to increase, individuals and businesses seek additional ways to process and store information. One option available to users is information handling systems. An information handling system generally processes, compiles, stores, and/or communicates information or data for business, personal, or other purposes thereby allowing users to take advantage of the value of the information. Because technology and information handling needs and requirements vary between different users or applications, information handling systems may also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information may be processed, stored, or communicated. The variations in information handling systems allow for information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications. In addition, information handling systems may include a variety of hardware and software components that may be configured to process, store, and communicate information and may include one or more computer systems, data storage systems, and networking systems. 
   A continuing problem associated with IHSs and IHS components is limited mobility. It has become desirable to limit or eliminate cables and other immobilizing connection devices used to transmit and receive information from system to system or amongst the system itself. 
   Wireless connections require radio frequency (RF) transceivers with antennas in order to allow transmission and reception of information while achieving high mobility. Integrating the RF transceivers into IHS platforms presents problems with antenna performance. This occurs because the antenna for a particular system is designed to transmit and receive within a particular frequency band. Unfortunately, when the RF transceiver is mounted in close proximity to other components in an information handling system, those components can shift the frequency band at which the antenna has been designed to operate. This results in the antenna transmitting and receiving less than optimally. Such degradation varies from system to system depending on the particular placement of the antenna in the IHS. The IHS designer may need to move the transceiver among several mounting locations within the IHS until acceptable results are achieved. 
   In addition to changing the transceiver mounting location, other steps may be taken to remedy the problem. The antenna can be designed to compensate for the degradation caused by the components in the near field of the transceiver and antenna However, this requires a different RF transceiver/antenna for any given system, each transceiver/antenna of which must be certified by the Federal Communications Commission. This ignores economies of scale, and requires that the RF transceiver design wait until the system design is finished. 
   Alternatively, the IHS can be designed so that its components allow the RF transceiver antenna to transmit and receive in its intended optimal frequency band. This solution is undesirable because it requires each system to be designed around the RF transceiver. 
   Accordingly, it would be desirable to provide an RF transceiver assembly in an IHS absent the disadvantages discussed above. 
   SUMMARY 
   According to one embodiment, an antenna assembly includes a antenna carrier that includes an antenna module receiving region. The antenna module includes an antenna and a radio frequency transceiver coupled to the antenna. The antenna carrier includes a passive tuning element situated adjacent to the module receiving region, the element exhibiting a length selected to cause the antenna to resonate at a predetermined frequency when the antenna module is placed in the module receiving region. 
   A principal advantage of this embodiment is that a radio frequency transceiver may operate in a platform at its optimal frequency band despite interaction with nearby platform components. The carrier provides a standardized mounting location for the radio frequency transceiver and its passive tuning element can be adjusted to allow use of the radio frequency transceiver in a variety of platforms. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a block diagram illustrating one embodiment of the disclosed information handling system. 
       FIG. 2  is a perspective view of an antenna carrier employed by the IHS of  FIG. 1 . 
       FIG. 3  is a perspective view illustrating a representative passive tuning element employed by the antenna carrier of  FIG. 2 . 
       FIG. 4  is a perspective view illustrating a representative antenna module employed by the IHS of  FIG. 1 . 
       FIG. 5  is a perspective view illustrating an embodiment of a passive tuning element seated in an antenna carrier. 
       FIG. 6  is a perspective view illustrating the antenna module of  FIG. 4  secured in the antenna carrier of  FIG. 5   
   

   DETAILED DESCRIPTION 
   For purposes of this disclosure, an information handling system may include any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or utilize any form of information, intelligence, or data for business, scientific, control, or other purposes. For example, an information handling system may be a personal computer, a network storage device, or any other suitable device and may vary in size, shape, performance, functionality, and price. The information handling system may include random access memory (RAM), one or more processing resources such as a central processing unit (CPU) or hardware or software control logic, ROM, and/or other types of nonvolatile memory. Additional components of the information handling system may include one or more disk drives, one or more network ports for communicating with external devices as well as various input and output (I/O) devices, such as a keyboard, a mouse, and a video display. The information handling system may also include one or more buses operable to transmit communications between the various hardware components. 
     FIG. 1  illustrates one embodiment of information handling system (IHS)  100  including a processor  105  which is connected to an Intel Hub Architecture (IHA) chipset  110 . Chipset  110  serves as a connection between processor  105  and other components of information handling system  100 . A graphics controller  115  couples a display  120  to processor  105 . A main memory  125  is coupled to processor  105  to provide the processor with fast storage to facilitate execution of computer programs by processor  105 . Input/output devices  130  are coupled to processor  105  to provide input to processor  105 . Examples of input devices include keyboards, touchscreens, and pointing devices such as mouses, trackballs and trackpads. Programs and data are stored on a media drive  160 , which is coupled to processor  105  by media drive controller  155 . Media drives include such devices as hard disks, optical disks, magneto-optical drives, floppy drives and the like. A network interface  150  allows the coupling of devices to IHA chipset  110  that assist in the connection of information handling system  100  to other systems. It should be understood that other busses and intermediate circuits can be deployed between the components described above and processor  105  to facilitate interconnection between the components and the microprocessor. 
   An antenna carrier  165 ,  FIG. 2 , includes an antenna module receiving surface  170 . Guide members  175  and  180  extend from different edges of antenna carrier  165 , substantially perpendicular to antenna module receiving surface  170 . A stop surface  185  extends from an edge of the antenna carrier  165 , substantially perpendicular to antenna module receiving surface  170 . A retention member  190  extends from stop surface  185 . A tuning element recess  195  exists on antenna module receiving surface  170  for holding a passive tuning element  200  (shown in  FIG. 3 ) on antenna carrier  165 . As seen in  FIG. 3 , passive tuning element  200  exhibits a U-shape and has a ground end  205  and a tuning end  210 . Ground end  205  includes a retention clip  215  which is used for retaining an antenna module  220  (shown in  FIG. 4 ) in antenna carrier  165 . As seen in  FIG. 4 , a radio frequency transceiver  225  is mounted on antenna module  220  and is used for transmitting and receiving information. An antenna  230  is coupled to radio frequency transceiver  225  and resonates at a predetermined frequency band. Guide surfaces  235  and  240  are substantially parallel to each other and are situated on opposite ends of antenna module  220 . A stop surface  245  is substantially perpendicular to guide surfaces  235  and  240 . A ground area  250  is located adjacent to stop surface  245 . 
   In operation,  FIGS. 5 and 6 , passive tuning element  200  is seated in tuning element recess  195  on antenna module receiving surface  170 . Tuning element recess  195  is the shape of passive tuning element  200  and at a depth on antenna module receiving surface  170  such that when passive tuning element  200  is seated in tuning element recess  195 , passive tuning element  200  is flush with antenna module receiving surface  170 . As seen in  FIG. 6 , antenna module  220  is slidably received by antenna carrier  165  by lining up guide surfaces  235  and  240  between guide members  175  and  180  and sliding antenna module  220  onto antenna carrier  165  until stop surface  245  engages stop member  185 . Engaging stop surface  245  and stop member  185  connects ground end  205  of passive tuning element  200  with ground area  250  of antenna module  220  and grounds passive tuning element  200 . Retention clip  215  secures antenna module  220  in antenna carrier  165  while helping ground passive tuning element  200 . Retention element  190  further secures antenna module  220  in antenna carrier  165 . 
   When antenna module  220  is secured in antenna carrier  165 , tuning end  210  of passive tuning element  200  is located adjacent to antenna  230  on antenna module  220 . By positioning tuning end  210  at different locations on the antenna module receiving surface  170 , antenna  230  can be made to resonate at different frequencies to compensate for the effects of objects in the IHS which are near antenna  230 . In the preferred embodiment shown in  FIG. 6 , tuning end  210  is situated directly below antenna  230 . Other embodiments are possible wherein tuning end  210  is situated in other locations below antenna module  220 , both adjacent to antenna  230  and distant from antenna  230 . In other words, as shown in  FIG. 5 , length L, or other dimensions of passive tuning element  200 , can be varied to change the resonant frequency of the antenna even though the dimensions of antenna  230  are fixed. While in the preferred embodiment shown in  FIG. 5 , passive tuning element  200  exhibits a U shaped geometry, other geometries such as a V shape, J shape, L shape, and I shape, for example, may be employed as well depending upon the particular application. 
   Although illustrative embodiments have been shown and described, a wide range of modification, change and substitution is contemplated in the foregoing disclosure and in some instances, some features of the embodiments may be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the embodiments disclosed herein.