Abstract:
A signal enhancer has a framework, a concave reflector having an axis of reflection, joined to the framework in a manner that direction of the axis of the reflector may be varied, and a support a cellular telephone joined to the axis in a manner that a cellular telephone may be placed and held in the support at different distances from the reflector along the axis of the reflector.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority to a Provisional Patent Application 61/785,181, filed on Mar. 14, 2013. All disclosure of the prior application is incorporated herein at least by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is in the technical field of wireless transmission, and pertains more particularly to signal enhancement. 
     2. Description of Related Art 
     It is well known in the art that cellular wireless systems rely on base stations that cover a limited geographic area, and that a cellular telephone needs to be within the reach of a base station to be able to place, receive or conduct a call. Coverage in any cellular system is not universal, and cell phones are well-known to have an ability to display signal strength. 
     In some circumstances signal strength may be a life-or-death matter. There are many instances where a person or a family have gotten lost in an area with poor or no cellular coverage, and have died as a result of not being able to call for help. 
     What is clearly needed is a way to enhance a very poor cellular signal to a better signal, strong enough to enable a person with a cellular telephone to make or receive a call. 
     BRIEF SUMMARY OF THE INVENTION 
     In one embodiment of the invention a signal enhancer is provided comprising a framework, a concave reflector having an axis of reflection, joined to the framework in a manner that direction of the axis of the reflector may be varied, and a support for a cellular telephone joined to the axis in a manner that a cellular telephone may be placed and held in the support at different distances from the reflector along the axis of the reflector. Reflectors may be of different sizes. Some reflectors may be parabolas. The support for the telephone may have notches at different positions to hold the telephone. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is a perspective view of a wireless signal enhancer in one embodiment of the present invention. 
         FIG. 2  is an exploded plan view showing parts of the signal enhancer of  FIG. 1 . 
         FIG. 3  is an elevation view of different enhancers in embodiments of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  is an illustration of a wireless signal enhancer  101  according to an embodiment of the present invention. In this embodiment there is a parabolic reflector disc  102 , one purpose of which is to concentrate a microwave cell phone signal toward the focal point of the parabola. The parabolic reflector chosen can either have a center focus or offset from center focus. In this embodiment an offset from center focus was chosen. In some embodiments it is not necessary that the reflector be parabolic. It is required for the invention that the reflector reflect incoming signals in a manner that the reflected signal is more concentrated than the incoming signal. 
     In the embodiment shown in  FIG. 1  parabolic reflector dish  102  may be attached to a disc holder  103  by means of a tapped screw  108  or other conventional fastener, or the reflector dish and holder may be fabricated as a one piece assembly, as seen in  FIG. 3  ( 3 ), which shows a large reflecting disk. Disc holder  103  may be attached to a bridge assembly  104  by lowering it into a disc holder position notch  211  shown in  FIG. 2 . Likewise the cell phone holder  105  is able to be positioned using cell phone holder position notches  209  ( FIG. 2 ). In this embodiment, this combination of assemblies determines the relative position of parabolic reflector disc  102  to cell phone holder  105 . 
     A cell phone in this embodiment may be attached to cell phone holder  105  using Velcro™ type tape  212 , or by any one of a number of methods, such as by wrapping a rubber band around the cell phone and cell phone holder, gluing them together, or using a universal or model-specific cell phone case as part of the cell phone holder, for example. Cell phones come in varied sizes and have their internal antennas located at varied positions, usually near the top rear part of the cell phone. Signal enhancement may be obtained by positioning the internal cell phone antenna along the path of the signal on its way from the parabolic reflector disc  102  to a location near its focal point. The cell phone can be attached to cell phone holder  105  at a height near the focal point that maximizes signal strength, as in  FIG. 3  ( 2 ). Cell phone holder  105  may then be attached to bridge assembly  104  at the signal-maximizing position using appropriate notch  209 . Adjacent cell phone holder position notches  209 , closer and further away from the parabolic disc, can then be tested to verify the best location for maximum signal strength. Another type of cell phone holder  105  may be used that slides on the bridge assembly  104 , closer to and farther from the parabolic reflecting disc  102 . 
     Parabolic reflector disc  102  may be fashioned from any number of materials such as plastic, steel, aluminum, wood, iron, or carbon fiber, for example, depending in part on intended uses and cost factors. One such method would be to make a wood, aluminum, or steel mold of the desired parabolic shape, vacuum form acrylic plastic, and then apply a conductive coating that will reflect microwaves. Plastic injection molding, a metal machine press, a stamping press, or other methods may also be used. In this embodiment, a wood mold  107  was fabricated and used to vacuum form ⅛ inch thick acrylic plastic. A number of other plastics may be used such as PETG or HIPS, depending at least in part on intended uses, environmental and cost factors. Then a conductive spray may be applied. Other methods of applying conductive coatings may be used, for example application of an adhesive backed conductive metal film on the disc surface or application of adhesive on metal tape or foil followed by lamination of the tape or foil to the parabolic disc. Disc holder  103  and cell phone holder  105  were fabricated from ⅛ inch thick acrylic plastic and laser cut to the desired shape. The thicknesses of any material used may be selected to achieve desired stiffness, rigidity, or other desired properties. Similarly, in this embodiment the bridge assembly  104  shape was fabricated from ¼ inch thick acrylic and trimmed with a laser cutter. For a larger reflecting disk, ⅜ inch thick acrylic plastic was chosen in this embodiment for its rigidity. In this embodiment a ¼ inch×20 threads per inch tripod mounting hole  210  in the bridge assembly  204  was also cut with a laser and then tapped. In this embodiment a hole was cut with a laser in the disc holder  202  and then tapped to allow for a mounting screw in the tapped hole  208 . In this embodiment, this mounting screw goes through a hole that was cut with a laser in the parabolic reflector disc  102 . In this embodiment, Velcro tape  212  was applied to the cell phone holder  105  to allow the affixing of the cell phone. Other methods for cutting the shapes desired may be used, such as a band or scroll saw and a drill press to cut holes. In this embodiment, a tripod  106  was attached to the bridge assembly. In another embodiment, the wireless signal enhancer may be attached to a bracket or another structure. 
     The embodiments described above have been tested using many cell phones, but the same signal enhancement can benefit any similar receiver or transmitter device in the microwave ranges, without the need for any direct hardwire connection to the device&#39;s antenna. 
     It will be apparent to a skilled artisan that the embodiments described above are exemplary of inventions that may have greater scope than any of the singular descriptions. There may be many alterations made in these examples without departing from the spirit and scope of the invention. For example, different signal enhancers may have different size reflecting discs or be made of a different thickness or have stiffening perimeter support or stiffening ribs, or be a different subsection cut from a paraboloid, but still achieve the same end result, which is an amplified signal strength concentrated on its way toward the focal point. Bridge assemblies, disc holders, and cell phone holders may look and be constructed differently, but achieve the same end result of maintaining the relative position difference between the reflector and the cell phone. These and many other features may change in different embodiments.