available technology

Acoustic sound speed profiling system

An acoustic sound speed profiling system is provided. The system includes a sound emitter and a series of sensors or hydrophones spaced vertically in a water column. The sound emitter is a high-frequency sound source adapted for mounting on the front end of a passive, towed sonar array. The sound...
available technology

Air-independent fuel combustion energy conversion

A metallic fuel mixture including solidic powders such as silicon, aluminum and magnesium together with an oxidant, and steam and hydrogen are fed into a combustor to undergo combustion therein. The combustor is positioned within a steam chamber enclosure filled with water as working fluid which is...
available technology
available technology

Antenna system and method for operating same

An antenna apparatus (and corresponding innate method) comprises an array of antenna elements each having a phase center. An observable signal" that contains a low-frequency component and a high-frequency component is generated. The high-frequency component is summed with the signal received by...
available technology

Antenna using a photonic bandgap structure

A microstrip patch antenna utilizes a microstrip patch antenna substrate formed of photonic bandgap material. One or more periodic patterns may be used therewith to produce multiple bandgaps into the photonic bandgap material. The periodic patterns may be produced by introducing periodic defects...

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