Patent Publication Number: US-2013242852-A1

Title: PORTABLE WiFi SIGNAL REPEATER

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to co-pending U.S. Provisional Patent Application Ser. Number 61/611301 filed Mar. 15, 2012 the disclosures of which are hereby incorporated by reference in their entirety. 
    
    
     FIELD 
     The embodiments herein relate to portable high-frequency signal repeater systems. It further relates to Wireless Fidelity or WiFi signal repeaters. 
     BACKGROUND 
     WiFi is used extensively In everyday life. It is a mechanism that allows electronic devices to communicate wirelessly over a computer network. A device-enabled with WiFi, such as a smartphone or tablet, can connect to the Internet via a wireless network access point. An access point (or hotspot) has a range of about 65 feet. indoors and approximately 300 feet outdoors. Signal coverage is an important issue. Typical WiFi signal improving devices are: wireless adapters, amplifiers, and Wi-Fi repeaters. Wireless adapters and amplifiers require a physical connection to the WiFi-enabled device. Wireless range-extenders or wireless repeaters can extend the range of an existing wireless network. Range-extenders or repeaters can extend the area of coverage by strategically placing the range-extender or repeater between the router and the WiFi-enabled device. They work well in an office or home environment or where there is access to a location between the router and device, where the signal is relatively strong. However, if there is no access to a location of strong signal between the router and portable device, repeaters do not improve the communication link. In addition, due to their high-power requirement, existing WiFi repeaters need to be plugged into a wall outlet. 
     SUMMARY 
     The repeater according to one embodiment consists of the following components: A high-gain antenna system, a low-gain antenna system, a circuit that detects the strongest signal or channel, amplifies it, and repeats it. The device also consists of a rechargeable battery and charging circuit similar to that of a mobile phone, battery level indicator, at least one programming data port, battery charging port, and signal level indicator. The repeater under the present embodiments can he placed in close proximity to the user&#39;s WiFi-enabled device (0 to 6 feet). As soon as the device is turned on, it is capable of detecting and locking to the strongest channel or signal available from the router and starts communicating with the router. It then repeats this signal. If this signal is not the desired signal, the device locks into the next available channel under the user&#39;s command. The power of the signal between the device and users WiFi-enabled device may be lower due to the proximity of the device to the Wi-Fi device (low-power communication). This helps improve the device&#39;s battery life. The coverage is an area of approximately 6-ft radius. 
     In another embodiment, the repeater ran be programmed by the user to only repeat the desired channel, in the same way as existing wall-plug versions do today. 
     The repeater according to the present embodiments should be capable of charging a typical smartphone, tablet, or similar WiFi-enabled device. In addition, a smartphone, tablet or similar device may use the presented repeater&#39;s battery. 
     The main features of some of the embodiments can include the following:
         a low-power portable repeater   a repeater that works when placed in very close proximity to a WiFi-enabled device   a battery-operated repeater   a repeater that can power another WiFi-enabled device   a repeater that can charge another WiFi-enabled device.       

    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows the repeater under the present disclosure and its user-interface components. 
         FIG. 2  shows a router and a tablet with a low signal level status due to the relatively large distance between the tablet and the router. 
         FIG. 3  shows the same setup shown in  FIG. 1  with the repeater under the embodiments placed in close proximity to the tablet. 
         FIG. 4  shows an alternate embodiment of the repeater under the present disclosure. 
         FIG. 5  shows a block diagram of the repeater under the present disclosure utilizing four antennas. 
         FIG. 6  shows a block diagram of the repeater under the present disclosure utilizing three antennas. 
         FIG. 7  shows a block diagram of the repeater under the resent disclosure utilizing two antennas. 
         FIG. 8  shows a block diagram of the repeater under the present disclosure utilizing one antenna. 
         FIG. 9  shows a dual-feed patch antenna system. 
         FIG. 10  shows a repeater operation flowchart. 
         FIG. 11  shows an alternate repeater operation flowchart. 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows the repeater ( 1 ) under the present disclosure and its user-interface components: ( 2 ) ON/OFF switch, SCAN button/LED ( 3 ), battery status LED ( 4 ), USB programming port ( 5 ), battery charging port ( 6 ), stand ( 7 ). Other components are: An internal directional antenna system for communicating with the router of base station, a preferably internal low-gain antenna system for communicating with a WiFi-enabled device, a radio frequency amplifier system, a circuit that detects the strongest signal available, amplifies it, and repeats it. The device also consists of a battery and charging circuit similar to that of a mobile phone. 
       FIG. 2  shows a router ( 1 ) and a tablet ( 2 ) with a low signal level status ( 3 ) due to the relatively large distance between the tablet and the router. 
       FIG. 3  shows the same setup shown in  FIG. 1  with the working repeater ( 1 ) under the present embodiments placed in close proximity to the tablet ( 2 ), resulting in the tablet&#39;s strong signal indicator ( 3 ). 
       FIG. 4  shows the repeater ( 1 ) under the present embodiments utilizing a high gain external omnidirectional antenna ( 2 ). This antenna is preferably removable and its minimum gain is 5 dBi. In this configuration, the user does not have to rotate or position the repeater towards a particular direction. 
       FIG. 5  shows a block diagram of the repeater ( 1 ) under the present disclosure utilizing four antennas: ANT1, ANT2, ANT3, and ANT4. ANT1 and ANT2 are part of the internal directional antenna system. This will typically be a dual-feed patch antenna of gain between 5 and 9 dBi. Antennas ANT3 and ANT4 are part of the preferably-internal low gain antenna system. Their gain should be preferably a minimum of −2 dBi. These two antennas can be printed on a dielectric block or printed on the repeater&#39;s radio frequency printed circuit board section. The polarization of these two internal antennas is preferably different. In addition, these two antennas may be spaced at least a ¼-wave apart. Block ( 2 ) represents all electronic circuitry of the repeater and block ( 3 ) is the battery. 
       FIG. 6  shows a block diagram of the repeater ( 1 ) under the present disclosure utilizing three antennas: ANT1, ANT2, and ANT3. ANT1 represents the internal directional antenna. This will typically be a patch antenna of gain between 5 and 9 dBi. Antennas ANT2 and ANT3 are part of the preferably-internal low gain antenna system. Their gain should be preferably a minimum of −2 dBi. These two antennas can be printed on a dielectric block or printed on the repeaters radio frequency printed circuit board section. The polarization of these two internal antennas is preferably different. In addition, these two antennas may be spaced at least a ¼-wave apart. Block ( 2 ) represents all electronic circuitry of the repeater and block ( 3 ) is the battery. 
       FIG. 7  shows a block diagram of the repeater ( 1 ) under the present disclosure utilizing two antennas: ANT1, and ANT2. ANT1 represents the internal directional antenna. This will typically be a patch antenna of gain between 5 and 9 dBi. ANT2 represents a preferably-internal low gain antenna. its gain should be preferably a minimum of −2 dBi. This antenna can be printed on a dielectric block or printed on the repeater&#39;s radio frequency printed circuit board section. Block ( 2 ) represents all electronic circuitry of the repeater and block ( 3 ) is the battery. 
       FIG. 8  shows a block diagram of the repeater ( 1 ) under the present disclosure utilizing a single antenna: ANTI. ANTI represents a preferably-removable external omnidirectional antenna. This antenna is typically a collinear helix antenna of gain preferably between 5 and 8 dBi. Block ( 2 ) represents all electronic circuitry of the repeater and block ( 3 ) is the battery. 
       FIG. 9  shows a dual-feed ceramic patch antenna ( 1 ), consisting of the metallic surface ( 2 ) etched on a dielectric block ( 3 ) of thickness d. Feeds ( 4 ) and ( 5 ) result in a two-antenna systems of different polarization: vertical vs horizontal. The polarization ma also be circular, left hand vs right hand. In the case of a single internal patch antenna of  FIG. 6 , the polarization is preferably circular. It should be noted that the patch antenna can be an air patch antenna: where a metallic surface is suspended on top of a ground plane and its fed directly or electromagnetically. 
       FIG. 10  shows a repeater operation flowchart. This flowchart corresponds to the repeater utilizing an internal directional antenna system. The repeater is placed in close proximity (0 to 6 feet) to WiFi-enabled device. The user points the repeater&#39;s front face to the direction of the strongest router signal and turns it ON. This is because the maximum directional antenna gain direction is at the front of the repeater. Only the high gain or directional antenna system communicates with the router. The repeater starts scanning for WiFi signals. There are 3 signal lights on the repeater front cover: green, yellow, red, corresponding to a strong, marginal, and poor signal, respectively. The unit locks to the strongest signal (or channel) and starts communicating with the router. If this signal is not the desired signal, the user presses the “SCAN” button and the repeater locks to the next available channel. The signal power between the device and router is the maximum allowed FCC limit. The signal between the device and user&#39;s WiFi-enabled device is preferably lower due to the proximity of the device to the WiFi-enabled device (low-power communication). This helps improve the repeater&#39;s battery life. The repeater&#39;s signal coverage may be an area of approximately 6-ft radius but can be increased if needed. 
       FIG. 11  shows an alternate repeater operation flowchart. In this embodiment, the user does not need to point the repeater to a particular direction. This is because the directional antenna is omnidirectional: the gain is the same along a 360-deg area. All other aspects of the repeater&#39;s operation are the same.