O'Reilly logo

Radio Propagation for Modern Wireless Systems by Henry L. Bertoni

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 4Antennas and Radiation

Antennas are used to convert the currents and voltages generated by the transmitter circuit into electromagnetic fields propagating through space. In the absence of material boundaries that reflect or scatter the waves, the fields propagate in the form of spherical waves, whose amplitudes vary inversely with the distance from the antenna. The field strength and polarization can also depend on the direction of propagation. This variation is described by the antenna pattern function and is one of the characteristics that distinguishes various types of antennas. The other distinguishing characteristic is the terminal impedance. These quantities, and their dependence on frequency, are determined by the shape of the ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required