Electromagnetic induction radio
A electromagnetic induction wireless communication system including: a magnetic antenna; an electric antenna; a tuning capacitor coupled to the magnetic antenna configured to tune the magnetic antenna; a controller configured to control the operation of the communication system; a signal source coupled to the controller configured to produce a communication signal used to drive the magnetic antenna and the electric antenna; a voltage control unit coupled to the signal source configured to produce one of an amplitude difference, phase difference, and an amplitude and a phase difference between the communication signal used to drive the magnetic antenna and electric antenna.
1. An electromagnetic induction wireless communication system comprising:
a magnetic antenna;
an electric antenna;
a tuning capacitor coupled to the magnetic antenna configured to tune the magnetic antenna;
a controller configured to control the operation of the communication system;
a signal source coupled to the controller configured to produce a communication signal used to drive the magnetic antenna and the electric antenna;
a voltage control unit coupled to the signal source configured to produce one of an amplitude difference, phase difference, and an amplitude and a phase difference between the communication signal used to drive the magnetic antenna and electric antenna.
2. The system of claim 1 , wherein voltage control unit is coupled to the electric antenna.
3. The system of claim 1 , wherein voltage control unit is coupled to the magnetic antenna.
4. The system of claim 1 , wherein the system is a transceiver.
5. The system of claim 1 , wherein the controller includes a data processing unit and signal processing unit.
6. The system of claim 1 , wherein the controller includes a data processing unit, a first signal processing unit, and a second signal processing unit, wherein the first signal processing unit is part of a receiver portion of the system and the second signal processing unit is part of a transmitter portion of the system.
7. The system of claim 1 , wherein tuning capacitor is adjustable by the controller.
8. The system of claim 1 , comprising a variable resistor coupled to the tuning capacitor and the magnetic antenna.
9. The system of claim 1 , wherein the voltage control unit has an output connected to the controller, wherein the output produces a signal indicating a difference in a received magnetic field strength and a received electric field strength.
10. A method of communicating near a human body comprising:
producing a communication signal;
producing a modified communication signal, wherein the modified communication signal has one of an amplitude difference, phase difference, and an amplitude and phase difference from the communication signal;
applying the communication signal to one of a magnetic antenna and an electric antenna;
applying the modified communication signal to the other of the magnetic antenna and the electric antenna;
controlling the production of the modified communication signal to improve the method of communicating near the human body.
11. The method of claim 10 , further comprising receiving a radiated signal.
12. The method of claim 10 , further comprising tuning the magnetic antenna.
13. The method of claim 12 , wherein tuning the magnetic antenna includes varying the capacitance of a tuning capacitor coupled to the magnetic antenna.
14. The method of claim 13 , further comprising adjusting a variable resistor coupled to the tuning capacitor and the magnetic antenna.
15. The method of claim 10 , further comprising:
monitoring signals at the magnetic antenna and the electric antenna; and
adjusting the modified communication signal based upon the monitored signals.
16. A non-transitory machine-readable storage medium encoded with instructions for execution by a processor, the non-transitory machine-readable medium comprising:
instructions for producing a communication signal;
instructions for producing a modified communication signal, wherein the modified communication signal has one of an amplitude difference, phase difference, and an amplitude and phase difference from the communication signal;
instructions for applying the communication signal to one of a magnetic antenna and an electric antenna;
instructions for applying the modified communication signal to the other of the magnetic antenna and the electric antenna;
instructions for controlling the production of the modified communication signal to improve the method of communicating near the human body.
17. The non-transitory machine-readable storage medium of claim 16 , further comprising receiving a radiated signal.
18. The non-transitory machine-readable storage medium of claim 16 , further comprising tuning the magnetic antenna.
19. The non-transitory machine-readable storage medium of claim 18 , wherein tuning the magnetic antenna includes varying the capacitance of a tuning capacitor coupled to the magnetic antenna.
20. The non-transitory machine-readable storage medium of claim 19 , further comprising adjusting a variable resistor coupled to the tuning capacitor and the magnetic antenna.