Antenna structures and methods for omni directional radiation patterns
AssigneeNXP B.V.
InventorAlexey Nazarov
Life of this patent
Estimating the term…
Abstract
A device is provided for use with a radio frequency identification (RFID) chip that receives and modulates a radio frequency (RF) signal. A substrate of the device includes a first short dipole antenna structure that backscatters a received RF signal to produce a first radiation pattern having nulls. A set of connection pads couple the RF signal from the antenna to a frontend transmitter circuit of the RFID chip. A second antenna structure backscatters the received RF signal by electromagnetic coupling to the first antenna structure and produces a second radiation pattern that complements the nulls in the first radiation pattern.
Claims20
A device for use with a radio frequency identification (RFID) chip that receives and modulates a radio frequency (RF) signal, the device comprising:
- a substrate having:
- a first short dipole antenna structure configured and arranged to backscatter a received RF signal to produce a first radiation pattern having nulls;
- a set of connection pads configured and arranged to couple the RF signal from the antenna to a frontend transmitter circuit of the RFID chip that is configured to backscatter the received RF signal by actively driving the first short dipole antenna structure;
- and
- a second antenna structure configured and arranged to backscatter the received RF signal in response to being passively driven by electromagnetic coupling to the first antenna structure to produce a second radiation pattern that introduces antenna gain that complements the nulls in the first radiation pattern.
A method for providing directionally insensitivity radiation patterns, the method comprising:
- receiving and modulating a radio frequency (RF) signal using a RFID frontend circuit;
- backscattering the modulated RF signal using a first short dipole antenna structure that is configured to produce a first radiation pattern having nulls;
- and
- backscattering the modulated RF signal in response to being passively driven by electromagnetically coupling a second antenna structure to the first antenna structure to produce a second radiation pattern that introduces antenna gain that complements the nulls in the first radiation pattern.
A device for use with a radio frequency identification (RFID) chip that receives and modulates a radio frequency (RF) signal, the device comprising:
- a substrate;
- a first short dipole antenna structure in the substrate and configured and arranged to backscatter a received RF signal to produce a first radiation pattern having nulls;
- a set of connection pads configured and arranged to couple the RF signal from the antenna to a frontend transmitter circuit of the RFID chip;
- and
- a second antenna structure in the substrate and configured and arranged to backscatter the received RF signal by electromagnetic coupling to the first antenna structure and to produce a second radiation pattern that complements the nulls in the first radiation pattern, wherein in the substrate the second antenna structure is configured and arranged in sufficiently close enough proximity to the first antenna structure to provide near-field antenna coupling between the first antenna structure and the second antenna structure and for the second antenna structure to be passively driven by the electromagnetic coupling and wherein the second antenna structure is characterized by a length and orientation, relative to the first antenna structure, to provide the second radiation pattern that complements the first radiation pattern by providing antenna gain at the nulls of the first radiation pattern.
Dependencies are inferred from the claim text.