Communications: radio wave antennas – Antennas – High frequency type loops
Patent
1995-08-14
1998-03-31
Hajec, Donald T.
Communications: radio wave antennas
Antennas
High frequency type loops
343744, 343748, 343866, H01Q 1112
Patent
active
057343535
ABSTRACT:
An electrically small antenna is constructed from a generalized contrawound toroidal helix made from a single continuous conductor divided into two length portions each of which are substantially the same length and which have a generalized helical pattern. The helical pitch senses the two length portions are opposite to one another. The two length portions are insulated from one another and overlap one another on the surface of a generalized toroid. A signal is fed to the antenna at a port defined by the node locations where the respective length portions join one another, or at a diametrically opposite point. At the fundamental mode of operation, the antenna is a half guided wavelength in circumference. The size of the antenna is further reduced because of the slow-wave properties of the underlying generalized contrawound toroidal helix. The antenna is omnidirectional with vertical polarization with a radiation pattern similar to an electric dipole, but in a physical package that is substantially smaller. A compact, broadband embodiment of the antenna is disclosed, as are other applications including a coaxial cavity resonator using the antenna as a feed element.
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Hajec Donald T.
Phan Tho
Van Voorhies Kurt L.
VorteKx P.C.
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