NFC communicators implementing coil voltage reduction circuitry
First Claim
1. A near field communications (NFC) device, comprising:
- an antenna circuit configured to enable inductive coupling, via a magnetic field, of the NFC device and another NFC device in near field range;
a signal supplier, coupled to the antenna circuit, configured to supply a drive signal to cause the antenna circuit to generate a radio frequency (RF) signal; and
a receiver, coupled to the antenna circuit, configured to receive a second RF signal inductively coupled, via the magnetic field, to the antenna circuit from the other NFC device in the near field range,wherein the antenna circuit comprises;
an antenna element coupled in parallel with a capacitor,wherein the antenna element comprises;
an antenna coil having a tap and a second capacitor coupled in series with the antenna coil, andwherein the receiver is coupled to the tap.
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Accused Products
Abstract
An NFC communicator has an antenna circuit to enable inductive coupling, via an RF H field, of the NFC communicator and another near field RF communicator in near field range. The antenna circuit has an antenna element coupled in parallel with a first capacitor to form a parallel LC circuit. The antenna element has an antenna coil in series with a second capacitor to reduce the voltage to which circuitry of the NFC communicator is subjected by a received RF H field. Alternatively or additionally, receive circuitry of the NFC communicator may be coupled to only a proportion of the antenna coil to reduce the voltage to which circuitry of the NFC communicator is subjected by a received RF H field.
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Citations
19 Claims
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1. A near field communications (NFC) device, comprising:
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an antenna circuit configured to enable inductive coupling, via a magnetic field, of the NFC device and another NFC device in near field range; a signal supplier, coupled to the antenna circuit, configured to supply a drive signal to cause the antenna circuit to generate a radio frequency (RF) signal; and a receiver, coupled to the antenna circuit, configured to receive a second RF signal inductively coupled, via the magnetic field, to the antenna circuit from the other NFC device in the near field range, wherein the antenna circuit comprises; an antenna element coupled in parallel with a capacitor, wherein the antenna element comprises; an antenna coil having a tap and a second capacitor coupled in series with the antenna coil, and wherein the receiver is coupled to the tap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A near field communication (NFC) device, comprising
an antenna element coupled in parallel with a first capacitor, the antenna element including: -
an antenna coil coupled in series with a second capacitor to affect a voltage resulting from inductive coupling to the antenna coil, the antenna coil a tap to enable tapping off only as of the voltage resulting from the inductive coupling; and a receiver, coupled to the tap, the receiver configured to receive a radio frequency (RF) signal inductively coupled, via the magnetic field, to the antenna element from another NFC device. - View Dependent Claims (15)
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16. A near field communications (NFC) enabled device, comprising:
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a host device; and a NFC device, coupled to the host device, the NFC device including; an antenna circuit configured to enable inductive coupling, via a magnetic field, of the NFC enabled device and another NFC device in near field range, the antenna circuit including; an antenna coil having a tap, a first capacitor coupled in series with the antenna coil; a second capacitor coupled in series with the antenna coil; and a receiver, coupled to the tap, the receiver configured to receive a radio frequency (RF) signal inductively coupled, via the magnetic field, to the antenna circuit from the other NFC device. - View Dependent Claims (17, 18, 19)
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Specification