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2-5 When viewed as a plane, the fields appear at right angles to each other
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The electromagnetic field: a brief review 13
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2-6 Wave polarization is determined by the direction of the electric field lines of force: (A) vertical polarized electromagnetic wave; (B) horizontally polarized wave
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zontal antennas produce horizontally polarized signals At least one text erroneously states that antennas will not pick up signals of the opposite polarity Such is not the case, especially in the high-frequency (HF) and lower very highfrequency (VHF) regions At VHF, ultrahigh frequency (UHF), and microwave frequencies a loss of approximately 20 to 30 dB can be observed due to crosspolarization An EM wave travels at the speed of light, designated by the letter c, which is about 300,000,000 m/s (or 186,000 mi/s) To put this velocity in perspective, a radio signal originating on the sun s surface would reach earth in about 8 minutes A terrestrial radio signal can travel around the earth seven times in one second The velocity of the
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14 Radio-wave propagation wave slows in dense media, but in air the speed is so close to the free-space value of c, that the same figures are used for both air and the near vacuum of outer space in practical problems In pure water, which is much denser than air, the speed of radio signals is about one-ninth that of the free-space speed This same phenomenon shows up in practical work in the form of the velocity factor (V) of transmission lines In foam dielectric coaxial cable, for example, the value of V is 080, which means that the signal propagates along the line at a speed of 080c, or 80 percent of the speed of light This coverage of radio propagation considers the EM wave as a very narrow ray or pencil beam that does not diverge as it travels That is, the ray remains the same width all along its path This convention makes it easy to use ray tracing diagrams Keep in mind, however, that the real situation, even when narrow-beamwidth microwave signals are used, is much more complicated Real signals, after all, are sloppier than textbook examples: they are neither infinitesimally thin, nor nondivergent
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The electromagnetic waves do not need an atmosphere in order to propagate, as you will undoubtedly realize from the fact that space vehicles can transmit radio signals back to earth in a near vacuum But when a radio wave does propagate in the earth s atmosphere, it interacts with the atmosphere, and its path of propagation is altered A number of factors affect the interaction, but it is possible to break the atmosphere into several different categories according to their respective effects on radio signals The atmosphere, which consists largely of oxygen (O2) and nitrogen (N) gases, is broken into three major zones: troposphere, stratosphere, and ionosphere (Fig 2-7) The boundaries between these regions are not very well defined, and change both diurnally (over the course of a day) and seasonally The troposphere occupies the space between the earth s surface and an altitude of 6 to 11 km (4 to 7 mi) The temperature of the air in the troposphere varies with altitude, becoming considerably lower at greater altitude compared with ground temperature For example, a +10 C surface temperature could reduce to 55 C at the upper edges of the troposphere The stratosphere begins at the upper boundary of the troposphere (6 to 11 km), and extends up to the ionosphere ( 50 km) The stratosphere is called an isothermal region because the temperature in this region is somewhat constant, despite altitude changes The ionosphere begins at an altitude of about 50 km (31 mi) and extends up to approximately 300 km (186 mi) The ionosphere is a region of very thin atmosphere Cosmic rays, electromagnetic radiation of various types (including ultraviolet light from the sun), and atomic particle radiation from space (most of these from the sun also), have sufficient energy to strip electrons away from the gas molecules of the atmosphere These freed electrons are called negative ions, while the O2 and N molecules that lost electrons are called positive ions Because the density of the air is so low at those altitudes, the ions can travel long distances before neutralizing each other by recombining Radio propagation on some bands varies markedly between daytime and nighttime because the sun keeps the level of ionization high during
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