Quasi-optical techniques

Article Abstract:

The increased use of communication at terahertz frequencies makes transmission media at short millimeter and submillimeter wavelengths of great importance. Research continues on finding a lower loss method of transmission to achieve high-performance systems at submillimeter wavelengths. Quasi-optical propagation uses a well collimated beam of radiation propagating in free space; the maximum beam size is restricted to a reasonable number of wavelengths, so diffraction becomes a significant issue in the analysis of the basic propagation of a beam of radiation, design of lenses and mirrors to limit beam growth, and understanding of the behavior of different types of quasi-optical devices. A relatively simple and elegant theory is available for a beam having a Gaussian amplitude distribution transverse to its axis of propagation, and whose minimum diameter is not too small.

Telecommunications, Product introduction, Bandwidth, Electromagnetic radiation, Communications Technology, New Technique, Receiver, Bandwidth Technology, Frequency, Gaussian Elimination, Optical Communication

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Nanosecond pulse techniques

Article Abstract:

Research on pulsed high-voltage techniques by the pulsed power group at the Atomic Weapons Research Establishment (AWRE) in Adlermaston, UK, are discussed. High-voltage pulsed systems may be direct-current (dc) charged to 12 million volts or more; their high-speed section can also be pulse-charged. Applications of pulse generators include relativistic electron beams, various ion beams, pulse X-ray sources, various kinds of electromagnetic pulse generators, spark chambers and studies of dielectric breakdown. Promising research areas include the development of dielectrics and the physics of pulse breakdown of media.

Electromagnetic fields, History, Technology, Physics, Pulse amplitude modulation

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