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An in-depth treatment of array phenomena and all aspects of phased array analysis and design Phased Array Antennas, Second Edition is a comprehensive reference on the vastly evolving field of array antennas. The Second Edition continues to provide an in-depth evaluation of array phenomena with a new emphasis on developments that have occurred in the field over the past decade. The book offers the same detailed coverage of all practical and theoretical aspects of phased arrays as the first edition, but it now includes: New chapters on array-fed reflector antennas; connected arrays; and reflect arrays and retrodirective arrays Brand-new coverage of artificial magnetic conductors, and Bode matching limitations A clear explanation of the common misunderstanding of scan element pattern measurement, along with appropriate equations In-depth coverage of finite array Gibbsian models, photonic feeding and time delay, waveguide simulators, and beam orthogonality The book is complemented with a multitude of original curves and tables that illustrate how particular behaviors were derived from the author’s hundreds of programs developed over the past forty years. Additionally, numerous computer design algorithms and numerical tips are included throughout the book to help aid in readers’ comprehension. Phased Array Antennas, Second Editio n is an ideal resource for antenna design engineers, radar engineers, PCS engineers, and communications engineers, or any professional who works to develop radar and telecommunications systems. It also serves as a valuable textbook for courses in phased array design and theory at the upper-undergraduate and graduate levels. • Author: Robert C Hansen • ISBN:9780470401026 • Format:Hardcover • Publication Date:2009-12-02
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This week at RAPID + TCT, nScrypt, a Florida-based manufacturer of micro-dispensing and 3D printing equipment, is showcasing examples of Radio Frequency (RF) Printed Circuit Structures (PCS) made from its Direct Digital Manufacturing (DDM) system, also known as Factory in a Tool (FiT). Included in this display is what is said to be the first 3D printed […]
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Ball Watches
Ball Trainmaster Moon Phase A new refined interpretation of moon phase patterns even in the cloudiest nights For centuries, mankind has been fascinated by the different phases of the Moon, as they guided us through travels, seasons and led to the creation of calendars. The regular pattern of the Moon thus determined the rhythm of human existence. BALL Watch Company combines regular phases of the Moon with innovation of watchmaking by unveiling the new Trainmaster Moon Phase masterpiece. The Trainmaster Moon Phase model features an automatic BALL RR1801 movement, housed in a round 40mm polished stainless steel case. The moon phase complication adds a touch of elegance and fascination to the modern watch design. The black, blue or silver dial is decorated with guilloche patterns resembling rays of moonlight radiating from the dial center. To recreate the glowing moon on the dial of a classical Trainmaster timepiece, the centrally-placed Moon Phase disc features the glowing moon lit with an array of H3 self-luminous micro gas tubes, decorated with silvery stars shimmering on a deep blue, black or white background resembling the sky. Besides the aesthetic values, the wearer can see the moon phase even on the cloudiest nights or in the worst of storms, since the moon ‰ÛÏglows itself‰Û on the wristwatch without external source of light or energy. To ensure perfect time reading even in total darkness, 14 H3 self-luminous micro gas tubes have been added to the dial indexes and hands. This Swiss state-of-art luminosity technology requires no external energy source and is up to 100 times brighter than the luminescent paint normally used in watches.
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They will never sit on your desk, and they will most certainly never fit in your pocket. Today, they’re fragile, and need to be kept at temperatures close to absolute zero. Quantum computers aren’t much like the desktop PCs we’re all so familiar with—they’re a whole new kind of machine, capable of calculations so…
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The far field pattern properties that are of most frequent concern to the array designer are the array sidelobe level, array gain and beamwidth. All these properties depend on the amplitude and phase excitation to the array of elements. The Adaptive antennas have the ability; to automatically respond to an unknown interference environment by steering the main beam in the desired direction, by steering the nulls and reducing sidelobe level in the direction of interference. They consists of an array of antenna elements and an adaptive receiver- processor which adjusts its element and an adaptive receiver-processor which adjusts its element weights toward some optimization of output SNR. In this dissertation, the pattern of an array will be easily controlled by adjusting the weights by a simple adaptive technique based on the LMS algorithm and Numerical pattern synthesis algorithm that controls the sidelobes. The obtained weights from MATLAB will be utilized in Electro Magnetic Simulation Software IE3D and the results of both softwares will be compared. This dissertation is introduced in current book. It is well validated by publications from international journals. Design of Conical Tem Feed for an Impulse Radiating Antenna (Paperback)
