Antenna structures and methods for omni directional radiation patterns

摘要

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.

主权项

1. 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.