Passive repeater for wireless communications

Abstract

Some embodiments provide a relatively small antenna apparatus that acts as a passive repeater. The antenna apparatus can be designed to facilitate radio frequency (RF) signal gain for a collection or range of frequencies. In some embodiments, the antenna apparatus is placed near a device with a wireless receiver and/or transmitter, where the antenna apparatus causes increased RF signal intensity at the device by coupling RF signals from a proximate area of higher RF signal intensity into the area around the device. Accordingly, in some instances, an embodiment of the antenna apparatus can be used to increase the RF signal intensity in a null spot or dead spot by coupling RF signal energy from an area proximate to the null spot that has higher RF signal intensity.

What is claimed is: 
     
         1 . An antenna apparatus comprising:
 an electromagnetically reflective layer, the electromagnetically reflective layer having first and second faces;   a first dielectric layer disposed on the first face of the electromagnetically reflective layer; and   a first arrangement of conductors disposed on the first dielectric layer, the first arrangement of conductors comprising:
 a first resonator including a first antenna having a respective feed point, a second antenna having a respective feed point, and a first coupling element electrically connecting the respective feed points of the first and second antennas; and 
 a first reflector electrically isolated from the first resonator and positioned adjacent to at least one of the first and second antennas, and wherein a longitudinal axis of the first reflector intersects the first coupling element. 
   
     
     
         2 . The antenna apparatus of  claim 1 , wherein the electromagnetically reflective layer is one of rigid and flexible. 
     
     
         3 . The antenna apparatus of  claim 1 , wherein the first reflector comprises first and second conductive portions separated by a gap through which the first coupling element extends and intersects the longitudinal axis of the reflector. 
     
     
         4 . The antenna apparatus of  claim 1 , wherein the first reflector comprises a single conductor, and the antenna apparatus further comprises a dielectric separator interposed between the first reflector and the first coupling element. 
     
     
         5 . The antenna apparatus of  claim 1 , wherein at least one of the first and second antennas is one of a dipole antenna, a rhombic antenna, a planar antenna, and a yagi antenna. 
     
     
         6 . The antenna apparatus of  claim 1 , wherein the first and second antennas are folded dipole antennas, and the respective feed point for each of the first and second antennas comprises first and second feed terminals, and wherein the coupling element includes first and second conductive traces, the first conductive trace electrically connecting the respective first feed terminals of the first and second antennas, and the second conductive trace electrically connecting the respective second feed terminals of the first and second antennas. 
     
     
         7 . The antenna apparatus of  claim 6 , wherein at least one of the first and second antennas includes an undulating portion. 
     
     
         8 . The antenna apparatus of  claim 6 , wherein the first arrangement of conductors further comprises:
 a second reflector electrically isolated from the first resonator and positioned adjacent to the second antenna, and wherein the longitudinal axis of the second reflector intersects the first coupling element,   and wherein the first reflector is positioned adjacent to the first antenna.   
     
     
         9 . The antenna apparatus of  claim 8 , wherein the first coupling element is straight and the first and second antennas are arranged so that the respective radiation pattern of one extends in the substantially opposite direction of the other. 
     
     
         10 . The antenna apparatus of  claim 8 , wherein the first coupling element includes a corner and the first and second antennas are arranged facing respective first and second directions. 
     
     
         11 . The antenna apparatus of  claim 8 , wherein the first arrangement of conductors further comprises at least one director in parallel with at least one of the first and second reflectors, and wherein a respective one of the first and second antennas is positioned between the at least one director and respective one of the first and second reflectors. 
     
     
         12 . The antenna apparatus of  claim 6 , wherein the first arrangement of conductors further comprises at least one director in parallel with the first reflector, and wherein one of the first and second antennas is positioned between the at least one director and the first reflector. 
     
     
         13 . The antenna apparatus of  claim 6 , wherein the first arrangement of conductors further comprises a plurality of directors parallel to the first reflector, and wherein one of the first and second antennas is positioned between the plurality of directors and the first reflector. 
     
     
         14 . The antenna apparatus of  claim 13 , wherein the plurality of directors are arranged so that the respective distance between adjacent directors decreases between successive pairs of directors starting from the distance between the first of the plurality of directors immediately adjacent to one of the first and second antennas. 
     
     
         15 . The antenna apparatus of  claim 13 , wherein the plurality of directors are arranged so that the respective distance between adjacent directors increases starting from the distance between the first of the plurality of directors immediately adjacent to one of the first and second antennas. 
     
     
         16 . The antenna apparatus of  claim 13 , wherein the plurality of directors are configured so that the length of a particular director is shorter than the immediately adjacent director starting from the first of the plurality of directors immediately adjacent to one of the first and second antennas. 
     
     
         17 . The antenna apparatus of  claim 13 , wherein the plurality of directors are configured so that the length of a particular director is longer than the immediately adjacent director starting from the first of the plurality of directors immediately adjacent to one of the first and second antennas. 
     
     
         18 . The antenna apparatus of  claim 1 , further comprising:
 a second dielectric layer disposed on the second face of the electromagnetically reflective layer; and   a second arrangement of conductors disposed on the second dielectric layer, the second arrangement of conductors comprising:
 a second resonator including a third antenna having a respective feed point, a third antenna having a respective feed point, and a second coupling element electrically connecting the respective feed points of the third and fourth antennas; and 
 a second reflector electrically isolated from the second resonator and positioned adjacent to at least one of the third and fourth antennas, and wherein a longitudinal axis of the second reflector intersects the second coupling element. 
   
     
     
         19 . The antenna apparatus of  claim 18 , further comprising:
 a conductive via extending through the first dielectric layer, the electromagnetically reflective layer and the second dielectric layer, the conductive via electrically connecting the first and second coupling elements; and   a dielectric separator interposed between the electromagnetically reflective layer and the via electrically isolating the electromagnetically reflective layer and the via.   
     
     
         20 . An antenna apparatus comprising:
 an electromagnetically reflective layer;   a dielectric layer on the electromagnetically reflective layer;   a plurality of antennas arranged on the dielectric layer in a respective plurality of directions, each of the plurality of antennas having a feed point;   at least one coupling element, wherein each coupling element electrically connects the respective feed points of a respective pair of antennas; and   at least one reflector electrically isolated from the plurality of antennas and positioned adjacent to at least one of the plurality of antennas, and wherein a respective longitudinal axis of the at least one reflector intersects the first coupling element.   
     
     
         21 . The antenna apparatus of  claim 19 , wherein each of the plurality of antennas is a folded dipole antenna, and the respective feed point for each antenna comprises first and second feed terminals, and wherein each coupling element includes first and second conductive traces, the first conductive trace electrically connecting the respective first feed terminals of a pair of antennas, and the second conductive trace electrically connecting the respective second feed terminals of the same pair of antennas.