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Phased array antennas consist of multiple stationary antenna elements, which are fed coherently and use variable phase or time-delay control at each element to scan a beam to given angles in space. Variable amplitude control is sometimes also provided for pattern shaping. Arrays are sometimes used in place of fixed aperture antennas (reflectors, lenses), because the multiplicity of elements allows more precise control of the radiation pattern,...
515 p dtu 15/11/2012 244 2
Từ khóa: Phased Array Antenna, amplitude control, kiểm soát biên độ, scanned electronically, quét điện tử, communications system, thông số kỹ thuật
Electronics for hobbyists - Survey of electronics hobbies
One nice thing about hobbies is that they are educational. For example, suppose that one day your imagination is captured by the sight of a remote control airplane, or when you hear a distant radio station by casually tuning your AM radio. The next thing you know, you're at the local library reading about and investigating this new and interesting activity.
69 p dtu 07/11/2012 176 1
Từ khóa: remote control, Electronics for hobbyists, Survey of electronics hobbies, thiết bị điện tử, công nghệ điện tử, kỹ thuật điện tử, điện tử điều khiển
Analog and Digital Circuits for Electronic Control System Applications
Analog system designers many times in the past avoided the use of electronics for their system functions because electronic circuits could not provide the dynamic range of the signal without severe nonlinearity, or because the circuits drifted or became unstable with temperature, or because the computations using analog signals were quite inaccurate. As a result, the design shifted to other disciplines, for example, mechanical. Today,...
329 p dtu 07/11/2012 223 7
Từ khóa: Digital Circuits, Electronic Control, system designers, thiết kế hệ thống, hệ thống điều khiển, điều khiển điện tử
Modern Control technology: Components and systems
A control system is a collection of components working together under the direction of some machine intelligence. In most cases, electronic circuits provide the intelligence, and electromechanical components such as sensors and motors provide the interface to the physical world. A good example is the modern automobile. Various sensors supply the on-board computer with information about the engine’s condition. The computer then calculates the...
635 p dtu 01/11/2012 211 4
Từ khóa: electronic circuits, Modern Control technology, physical world, kiểm soát công nghệ, hệ thống công nghệ, khoa học kỹ thuật