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Advantages and Limitations Powdered-iron cores are common at high and very high radio frequencies. Ferrite is a special form of powdered iron that has exceptionally high permeability, causing a great concentration of magnetic flux lines within the coil. Ferrite is used at audio frequencies, as well as at low, medium, and high radio frequencies. Coils using these materials can be made much smaller, physically, than can air-core coils having the same inductance. The main trouble with ferromagnetic cores is that, if the coil carries more than a certain amount of current, the core will saturate. This means that the ferromagnetic material is holding as much flux as it possibly can. When a core becomes saturated, any further increase in coil current will not produce a corresponding increase in the magnetic flux in the core. The result is that the inductance changes, decreasing with coil currents that are more than the critical value. In extreme cases, ferromagnetic cores can also waste considerable power as heat. This makes a coil lossy.

There are several advantages to toroidal coils over solenoidal, or cylindrical, ones. First, fewer turns of wire are needed to get a certain inductance with a toroid, as compared with a solenoid. Second, a toroid can be physically smaller for a given inductance and current-carrying capacity. Third, and perhaps most important, essentially all of the flux in a toroidal inductor is contained within the core material. This reduces unwanted mutual inductances with components near the toroid. There are some disadvantages, or limitations in the flexibifity, of toroidal coils. It is more difficult to permeability-tune a toroidal coil than it is to tune a solenoidal one. It s been done, but the hardware is cumbersome. Toroidal coils are harder to wind than solenoidal ones. Sometimes, mutual inductance between or among physically separate coils is wanted; with a toroid, the coils have to be wound on the same form for this to be possible.

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Permeability Tuning Solenoidal coils can be made to have variable inductance by sliding ferromagnetic cores in and out of them. The frequency of a radio circuit can be adjusted in this way, as you ll learn later in this book. Because moving the core in and out of a coil changes the effective permeability within the coil, this method of tuning is called permeability tuning. The in/out motion can be precisely controlled by attaching the core to a screw shaft, and anchoring a nut at one end of the coil (Fig. 10-7). As the screw shaft is rotated clockwise, the core enters the coil, and the inductance increases. As the screw shaft is rotated counterclockwise, the core moves out of the coil, and the inductance decreases. Toroids Inductor coils do not have to be wound on cylindrical forms, or on cylindrical ferromagnetic cores. There s another coil geometry, called the toroid. It gets its name from the shape of the ferromagnetic core. The coil is wound over a core having this shape (Fig. 10-8), which resembles a donut or bagel.

As modern as cellular telephony is considered to be, it was originally conceived in the 1940s at Bell Labs as part of a plan to overcome the congestion and poor service issues associated with mobile telephone systems.

There is another way to confine the magnetic flux in a coil so that unwanted mutual inductance does not occur. This is to extend a solenoidal core completely around the outside of the coil, making the core into a shell (Fig. 10-9). This is known as a pot core. Whereas in most inductors the coil is wound around the form, in a pot core the form is wrapped around the coil.

There are several advantages to toroidal coils over solenoidal, or cylindrical, ones. First, fewer turns of wire are needed to get a certain inductance with a toroid compared to a solenoid. Second, a toroid can be physically smaller for a given inductance and current-carrying capacity. Third, practically all the flux is contained within the core material. This reduces unwanted mutual inductances with components near the toroid. Toroidal coils have limitations, too. It is more difficult to permeability-tune a toroidal coil than it is to tune a solenoidal one. Toroidal coils are harder to wind than solenoidal ones. Sometimes, mutual inductance between or among physically separate coils is actually desired; with a toroid, the coils have to be wound on the same form for this to be possible.

10-9

Figure 5-12 An array of low-power cells in a cellular network. Notice how the coverage areas overlap, allowing handoff of a call to occur from one cell to another. Also, because of low power and distance, frequencies can be reused.

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