By Richard Poisel
Antenna structures play a serious position in glossy digital struggle communications and radar. contemporary EW engineers have to have an effective realizing of the layout rules of this know-how and the way antenna platforms are utilized in the sector. This entire booklet serves as a one-stop source for useful EW antenna procedure knowledge. Supported with over seven-hundred illustrations and approximately 1,700 equations, this authoritative reference deals pros particular motives of all of the vital foundations and points of this expertise. additionally, engineers get an in-depth therapy of a variety of antenna procedure purposes. The publication provides the foremost features of every kind of antenna, together with dipoles, monopoles, loops, arrays, horns, and patches. Practitioners additionally locate helpful discussions at the obstacles of antennas procedure functionality in EW functions.
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Sample text
Part III covers some topics related to antenna systems. In particular, antenna matching is discussed in Chapter 20, multicouplers are presented in Chapter 21, and the salient characteristics of antenna radomes are explained in Chapter 22. We have included five appendices that discuss related topics, but not deemed appropriate to include in the main text structure. Appendix A discusses the classes of amplifiers and Appendix B considers the basic characteristics of various types of RF switches used in antennas systems.
Over their band of operation, they satisfy a relatively low value of voltage standing wave ratio (VSWR); < 2 is such a typical parameter. 10 is an example of a frequency-independent antenna. We discuss the characteristics of the log-periodic and other types of frequencyindependent antennas in Chapter 12. 11). They are lightweight, inexpensive, and easy to integrate with accompanying electronics. While the antenna can be 3-D in structure (wrapped around an object, for example), the elements are usually flat, hence, their other name, planar antennas.
3 Electromagnetic Waves All waves, including EM waves, come in two basic types: transverse waves and longitudinal waves. The characteristic of the transverse wave is that the direction in which the wave is traveling and the amplitude variation are perpendicular to each other. Water waves, rope waves, phone cord waves, and EM waves are of this type. With a longitudinal wave the wave direction and the amplitude variation direction are parallel to each other. Some systems have both types. The waves in the ocean, for example, exhibit both types.