Low-aspect antenna having a vertical electric dipole field pattern

摘要

An antenna comprises a ring-shaped radiofrequency resonator that defines a path for a circulating magnetic current. In an implementation, the resonator has a height of no more than 2% of an operating wavelength, and it has an electromagnetic resonance at the operating frequency. In an implementation, the antenna is of a type having a vertical, short electric dipole radiation or sensitivity pattern. It comprises, as the dominant radiative element, a ring of material disposed transverse to the vertical dipole axis and having an average magnetic permeability more than ten times the magnetic permeability of air. The ring has a maximum outer diameter and a height that is less than the maximum outer diameter. The antenna further includes a feed structure adapted to couple radiofrequency energy into and/or out of a magnetic current circulating in the ring.

主权项

1. An antenna having a radiation pattern or sensitivity pattern that is characteristic of a short electric dipole radiator having a dipole axis, comprising:
a ring of material disposed transversely to the dipole axis and having an average magnetic permeability more than ten times the magnetic permeability of air; and a feed structure adapted to couple radiofrequency energy into and/or out of a magnetic current circulating in the ring; wherein:
the ring is the dominant radiative element of the antenna; the ring has a maximum diameter and a height as measured from a ground plane or, absent a ground plane, from a median plane of the ring; and the height is less than the maximum outer diameter.