Method and system for selecting a wireless signal based on an antenna or bias voltage
View Patent ↗A method for wireless communication is provided and may include configuring at least one capacitor array in an antenna system to control a frequency for receiving external signals. An antenna and at least one inductor in the antenna system may be configured for receiving external signals at a first frequency. An inductor and a voltage source, a capacitor, and/or a ground reference may be configured for receiving the external signals at a different frequency if the frequency is utilized for backscattered signal reception and/or magnetically coupled signal reception. Near field communication (NFC) signals may be received at the different frequency for backscattered signals. Radio frequency identification (RFID) signals may be received at the different frequency for magnetically coupled signals. The first frequency may be within the FM frequency band. The antenna system may be configured to transmit signals to be subsequently received as backscattered signals or magnetically coupled signals.
1. A system for wireless communication, said system comprising:
a radio frequency (RF) receiver configured to receive a wireless signal; and
a control circuit configured to:
utilize said wireless signal for frequency modulation (FM) radio broadcast signal reception, near field communications (NFC) signal reception, or radio frequency identification (RFID) signal reception; and
couple a bias voltage to one or more inductors when a frequency of the wireless signal is utilized for NFC signal reception or RFID signal reception.
2. The system of claim 1 , wherein said control circuit is configured to select said frequency of said wireless signal by adjusting a capacitance of one or more capacitive arrays.
3. The system of claim 2 , wherein each of said one or more capacitive arrays comprises a plurality of switches configured to couple one or more of a plurality of capacitors to each of said one or more capacitive arrays.
4. The system of claim 1 , wherein said bias voltage comprises one of a voltage source, a capacitor and a ground reference.
5. The system of claim 1 , wherein said frequency of said wireless signal utilized for said FM radio broadcast signal reception is between 87.5 MHz and 108 MHz.
6. The system of claim 1 , wherein said frequency of said wireless signal utilized for said NFC signal reception or RFID signal reception is approximately 13.5 MHz.
7. The system of claim 1 , wherein said control circuit is configured to compensate for a center frequency drift of said wireless signal by adjusting a capacitance of one or more capacitive arrays.
8. The system of claim 1 , wherein said RF receiver enables detection of electromagnetic energy in a wireless medium for said NFC signal reception or RFID signal reception.
9. The system of claim 8 , wherein said RF receiver receives data in said wireless signal based on detected variations in a strength of said electromagnetic energy.
10. The system of claim 1 , wherein the control circuit is further configured to:
couple the one or more inductors to an antenna when the frequency of the wireless signal is utilized for FM radio broadcast signal reception.
11. A method for wireless communication, said method comprising:
receiving, by a radio frequency (RF) receiver, a wireless signal;
utilizing, by control circuit, the wireless signal for frequency modulation (FM) radio broadcast signal reception, near field communications (NFC) signal reception, or radio frequency identification (RFID) signal reception; and
coupling, by the control circuit, a bias voltage to one or more inductors when a frequency of the wireless signal is utilized for NFC signal reception or RFID signal reception.
12. The method of claim 11 , further comprising:
selecting, by the control circuit, the frequency of the received wireless signal by adjusting a capacitance of one or more capacitive arrays.
13. The method of claim 11 , wherein said bias voltage comprises one of a voltage source, a capacitor and a ground reference.
14. The method of claim 11 , wherein said frequency of said received wireless signal utilized for said FM radio broadcast signal reception is between 87.5 MHz and 108 MHz.
15. The method of claim 11 , wherein said frequency of said received wireless signal utilized for said NFC signal reception or RFID signal reception is approximately 13.5 MHz.
16. The method of claim 11 , wherein said control circuit is configured to compensate for a center frequency drift of said received wireless signal by adjusting a capacitance of one or more capacitive arrays.
17. The method of claim 11 , wherein said RF receiver enables detection of electromagnetic energy in a wireless medium for said NFC signal reception or RFID signal reception.
18. The method of claim 17 , wherein said RF receiver receives data in said received wireless signal based on detected variations in a strength of said electromagnetic energy.
19. The method of claim 12 , wherein each of said one or more capacitive arrays comprises a plurality of switches configured to couple one or more of a plurality of capacitors to each of said one or more capacitive arrays.
20. The method of claim 11 , further comprising:
coupling the one or more inductors to an antenna when the frequency of the wireless signal is utilized for FM radio broadcast signal reception.