Abstract: A fluidic antenna is described, using an electromagnetic energy coupler, a non-metallic container coupled to the electromagnetic energy coupler, a fluid having charged particles moving through the non-metallic container at a predetermined rate, and a charge focuser disposed about the non-metallic container, wherein the electromagnetic energy coupler is configured to couple energy between the fluid and at least one of a transmitter and receiver, and the charge focuser is configured to adjust a cross sectional area of charged particles in the fluid to result in a fluid characteristic impedance that approaches that of a surrounding medium, thereby enabling at least one of launching and receiving electromagnetic energy.

Abstract: An method and apparatus for active noise cancellation in a conduit carrying a liquid, employing a detector hydrophone, an acoustic canceler downstream of the detector hydrophone, an error hydrophone, and an adaptive filter. The outputs of the detector hydrophone, acoustic canceler, and error hydrophone are directed into the adaptive filter, which uses them to select the form of acoustic signal which the canceler directs into the liquid to cancel the noise. One embodiment of the invention employs two such cancellation circuits, and an additional adaptive filter which globally optimizes the cancellation of both circuits.

Abstract: The invention is a passive control technique effective in eliminating reverse flow instability. The invention preferably includes two flow stabilizers each preferably having a planar face. The flow stabilizers are disposed at an exit end of an injector so that the planar faces oppose each other and diverge in a direction normal to the flow of the gas passing through the injector.