Patent ID: 8253626

Claim:
A multiple phase state near-field electromagnetic system for location or communication comprising: a transmitter configured for transmitting a signal in a first phase state and in a second phase state; and a first near field receiver; said first near field receiver configured for receiving said signal within a near field range from said transmitter; said first near field receiver configured for receiving a first near field property of said signal in said first phase state and for receiving said first near field property of said signal in said second phase state; said first near field receiver configured for receiving a second near field property of said signal in said first phase state and for receiving said second near field property of said signal in said second phase state; said first near field receiver configured for generating a first phase state comparison by comparing said first near field property with said second near field property in response to said signal in said first phase state; said first phase state comparison having a first known relationship between said first phase state comparison and loci of associated transmitter positions; said first near field receiver configured for generating a second phase state comparison by comparing said first near field property and said second near field property in response to said signal in said second phase state; said second phase state comparison having a second known relationship between said second phase state comparison and loci of associated transmitter positions; said first near field receiver configured for determining a two coordinate position for a location of said transmitter relative to a location of said first near field receiver based on said first phase state comparison and said second phase state comparison, or said first near field receiver configured for determining information from said transmitter based on said first phase state comparison and said second phase state comparison.