Abstract: An antenna element comprising at least two conductive elements, and a fluid (e.g., gas or vapor) filled bulb or tube positioned between the conductive elements is provided. The fluid is capable of ionization such that when the fluid in the bulb or tube is energized, the conductive elements electrically communicate with one another, and when the fluid is not energized, the conductive elements do not electrically communicate with one another.

Abstract: An antenna system for receiving electromagnetic waves of predetermined frequency range is disclosed comprising an antenna configured for receiving electromagnetic waves; and a plasma filter configured for reflecting a first electromagnetic frequency emitted from a remote source, while at the same time passing a second electromagnetic frequency, such that one of the first electromagnetic frequency and the second electromagnetic frequency is received by the antenna. The electromagnetic wave filter can comprise a power medium positioned with respect to a region of space; a composition disposed within the region of space for forming a plasma; an energy source electromagnetically coupled to the power medium such that a plasma may be formed in the region of space; and a control mechanism for varying plasma density within the region of space, wherein the plasma density will reflect a first electromagnetic frequency emitted from a remote source, while at the same time passing a second electromagnetic frequency.

Abstract: Phase shifting plasma electromagnetic waveguides and plasma electromagnetic coaxial waveguides, as well as plasma waveguide horn antennas, each of which can be reconfigurable, durable, stealth, and flexible are disclosed. Optionally, an energy modifying medium to reconfigure the waveguide such that electromagnetic waves of various wavelengths or speeds can be propagated directionally along the path can be used. Similarly, these waveguides may be modified into coaxial configurations.

Abstract: The present invention is drawn to an antenna having a reconfigurable length, and a method of reconfiguring an antenna. The antenna can comprise an enclosed composition capable of forming plasma operable as an antenna; an energy source configured for applying variable energy levels to the composition to thereby form variable plasma configurations; and an enclosure containing the composition. The enclosure can have a proximal end, wherein upon application of a first energy level to the composition, a first plasma length with respect to the proximal end is formed, and upon application of a second energy level to the composition, a second plasma length with respect to the proximal end is formed.