Antenna system using capacitively coupled compound loop antennas with antenna isolation provision

摘要

An antenna system is provided, including a first antenna, a second antenna, a ground plane, and a resonant isolator coupled to the first and second antennas. Each of the antennas is configured to be a capacitively-coupled compound loop antenna, and the resonant isolator is configured to provide isolation between the two antennas at resonance. The two antennas may be symmetrical or asymmetrical and include a first element that emits a magnetic field and a second element that generates an electrical field that is orthogonal to the magnetic field. The radiating element of the second element may be capacitively coupled to the remainder of the second element. The resonate isolator may be comprised of a single conductive element or two conductive elements that are capacitively coupled.

主权项

1. An antenna system, comprising:
a first layer including at least a pair of antennas having a first antenna and a second antenna, the first layer further including a first ground plane; and a second layer including a resonant isolator and a second ground plane, the resonant isolator being a conductive element that is placed on or within the second layer separate from the second ground plane, the resonant isolator having a first end portion and a second end portion, the resonant isolator being configured to electromagnetically isolate the first antenna from the second antenna at a resonance, the first end portion being coupled to the first antenna by a first via and the second end portion being coupled to the second antenna by a second via, the first via and the second via being formed vertical to the first layer and the second layer and separated from the first and second ground planes; and wherein each of the first antenna and the second antenna include:
a first element that is coupled to a current feed point at a first end point and is shorted to the first ground plane at a second end point, the first element emitting a magnetic field; anda second element that is coupled to the first element at an electrical length of substantially 90 degrees or an odd multiple of substantially 90 degrees from the feed point, the second element generating an electrical field substantially orthogonal to the magnetic field.