Wireless sensor device

Abstract

A wireless sensor device capable of constant operation without replacement of batteries. The wireless sensor device is equipped with a rechargeable battery and the battery is recharged wirelessly. Radio waves received at an antenna circuit are converted into electrical energy and stored in the battery. A sensor circuit operates with the electrical energy stored in the battery, and acquires information. Then, a signal containing the information acquired is converted into radio waves at the antenna circuit, whereby the information can be read out wirelessly.

1 . (canceled) 
     
     
         2 . A device comprising:
 a positive electrode; and   a negative electrode,   wherein activated carbon is provided on a surface of the positive electrode and the negative electrode.   
     
     
         3 . A device comprising:
 a positive electrode; and   a negative electrode,   wherein each of the positive electrode and the negative electrode comprises carbon.   
     
     
         4 . A device comprising:
 a positive electrode; and   a negative electrode,   wherein activated carbon is provided on a surface of the positive electrode and the negative electrode, and   wherein polarized ions are provided on a surface of the activated carbon.   
     
     
         5 . The device according to  claim 2 , wherein the positive electrode and the negative electrode function as capacitors. 
     
     
         6 . The device according to  claim 3 , wherein the positive electrode and the negative electrode function as capacitors. 
     
     
         7 . The device according to  claim 4 , wherein the polarized ions of one of the positive electrode and the negative electrode function as a capacitor. 
     
     
         8 . The device according to  claim 4 , wherein the polarized ions of one of the positive electrode and the negative electrode function as an electric double layer. 
     
     
         9 . The device according to  claim 5 , wherein a capacitance of the capacitors are 0.1 F or more. 
     
     
         10 . The device according to  claim 6 , wherein a capacitance of the capacitors are 0.1 F or more. 
     
     
         11 . The device according to  claim 7 , wherein a capacitance of the capacitor is 0.1 F or more. 
     
     
         12 . The device according to  claim 9 , wherein a size of the capacitors is about a coin. 
     
     
         13 . The device according to  claim 10 , wherein a size of the capacitors is about a coin. 
     
     
         14 . The device according to  claim 11 , wherein a size of the capacitor is about a coin.