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Books > Professional & Technical > Energy technology & engineering > Electrical engineering
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Wide-Range and Multi-Frequency Antennas (Hardcover)
Loot Price: R4,778
Discovery Miles 47 780
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Wide-Range and Multi-Frequency Antennas (Hardcover)
Expected to ship within 12 - 19 working days
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Expanding the range of antenna frequency is the main objective of
this book. Solutions proposed are based on the development of new
theoretical methods for analyzing and synthesizing antennas. The
book shows that concentrated capacitive loads connected along
linear and V-antennas provide a high level of matching with a cable
over a wide frequency range and improves directional
characteristics of antennas, i.e. increases the communication
distance. New theoretical methods are proposed for analysis and
synthesis of antennas under consideration: 1) method of calculating
directional characteristics of radiators with a given current
distribution, and 2) method of electrostatic analogy for
calculating mutual and total fields of complex multi-element
radiating structures. These methods allow us to obtain optimal
directional characteristics for director-type antennas (arrays of
Yagi-Uda) and log-periodic antennas with concentrated capacitances
and show that use of capacitors makes it possible to extend the
frequency range of the director antennas and to decrease dimensions
of the log-periodic antennas Multi-element (flat and
three-dimensional) self-complementary antennas with different
variants of connecting generator poles and cable wires to antenna
elements are proposed, which improves the matching with a cable.
Characteristics of flat structures are compared with
characteristics of volume structures: conical, parabolic, and
located on a pyramid edges. The book describes new versions of
transparent antennas, antennas for cellular communication,
multi-tier and multi-radiator antennas, and much more.
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