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Cellular systems have four key design principles, shown in Figure 5-12, which are the same today as they were in the 1940s These design principles consist of the use of many low-power, small coverage area transmitters instead of a single, powerful, monolithic transmitter to cover a wide area; frequency reuse; the concept of cell splitting; and central control and cell-to-cell handoff of calls These concepts are fairly straightforward The first relies on the philosophy that the whole is greater than the sum of its parts By using a large number of low-power transmitters scattered across a broad coverage zone, each capable of handling multiple simultaneous calls, more users can be supported than with a single, monolithic transmitter The second, frequency reuse, takes into account the fact that cellular telephony, like all radio-based services, has been allocated a limited number of frequencies by the FCC.

The radio frequency (RF) spectrum ranges from a few kilohertz to well above 100 GHz. At the low end of this range, inductors are similar to those at AF. As the frequency increases, cores having lower permeability are used. Toroids are common up through about 30 MHz. Above that frequency, aircore coils are more often used. In RF applications, coils are routinely connected in series or in parallel with capacitors to obtain tuned circuits. Other arrangements yield various characteristics of attenuation versus frequency, serving to let signals at some frequencies pass through, while rejecting signals at other frequencies. You ll learn more about this in the discussion about resonance in Chap. 17.

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The radio frequencies range from 9 kHz to well above 100 GHz. At the low end of this range, inductors are similar to those at audio frequencies. As the frequency increases, cores having lower permeability are used. Toroids are quite common up through about 30 MHz. Above that frequency, air-core coils are more often used. In radio-frequency (rf) circuits, coils are routinely connected in series or in parallel with capacitors to obtain tuned circuits. Other arrangements yield various characteristics of attenuation versus frequency, serving to let signals at some frequencies pass, while rejecting signals at other frequencies. You ll learn more about this in the chapter on resonance.

By using geographically small, low-power cells, frequencies can be reused by non-adjacent cells When usage areas become saturated by excessive usage, cells can be split When traffic engineers observe that the number of callers refused service because congestion reaches a critical level, they can split the original cell into two cells by installing a second site within the same geographical area that uses a different set of non-adjacent frequencies This has an extended impact; as the cells become smaller, the total number of calls that the aggregate can support climbs dramatically Because of cellular geometry, if the radius of the cell is halved, the number of supported calls is quadrupled The smaller the cell, therefore, the larger the total number of simultaneous callers can be accommodated Of course, this also causes the cost of deployment to climb dramatically.

Transmission-Line Inductors At frequencies about 100 MHz, another type of inductor becomes practical. This is the type formed by a length of transmission line. A transmission line is generally used to get energy from one place to another. In radio communications, transmission lines get energy from a transmitter to an antenna, and from an antenna to a receiver. Most transmission lines are found in either of two geometries, the parallel-wire type or the coaxial type. A parallel-wire transmission line consists of two wires running alongside each other with constant spacing (Fig. 10-10). The spacing is maintained by polyethylene rods molded at regular in-

At radio frequencies of more than about 100 MHz, another type of inductor becomes practical. This is the type formed by a length of transmission line. A transmission line is generally used to get energy from one place to another. In radio communications, transmission lines get energy from a transmitter to an antenna, and from an antenna to a receiver.

tervals to the wires, or by a solid web of polyethylene. The substance separating the wires is called the dielectric of the transmission line. A coaxial transmission line has a wire conductor surrounded by a tubular braid or pipe (Fig. 10-11). The wire is kept at the center of this tubular shield by means of polyethylene beads, or more often, by solid or foamed polyethylene, all along the length of the line.

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