By Warren L. Stutzman, Gary A. Thiele
Stutzman's third version of Antenna conception and Design offers a extra pedagogical process with a better emphasis on computational equipment. New good points comprise extra glossy fabric to make the textual content extra interesting and correct to working towards engineers; new chapters on platforms, low-profile parts and base station antennas; organizational alterations to enhance realizing; extra information to chose vital issues resembling microstrip antennas and arrays; and multiplied measurements topic.
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Extra resources for Antenna Theory and Design (3rd Edition)
A broadband antenna with circular geometry has an active region where the circumference is one wavelength and produces circular polarization. An example is the spiral antenna illustrated in, Fig. 1-8 which can have a 20:1 bandwidth. A broadband antenna made up of linear elements or straight edges has an active region where the elements are about a half-wavelength in extent and produces linearly polarized radiation parallel to the linear elements. Because only a portion of a broadband antenna is responsible for radiation at a given frequency, the gain is low.
1-6a. In transmission lines, the conductors guide the waves and the power resides in the region surrounding the conductors as manifested by the electric and magnetic fields shown in Fig. 1-6a. The electric fields originate from or terminate on charges on the wires and are perpendicular to the wires, and the magnetic fields encircle the wires. Note that all fields reinforce between the wires and cancel elsewhere. This is true for a wire spacing that is much smaller than a wavelength, which is usually the case.
But high frequencies are popular for communication applications because of the available wide bandwidth. So as the distance or frequency increases, the signal losses and costs of using transmission lines increase, and the decision is often to use antennas. For long distances, radio communication using transmit and receive antennas is more appropriate and much less expensive than using a transmission line. Antennas must be used in several applications. For example, mobile communications involving aircraft, spacecraft, ships, or land vehicles require antennas.