Download Antenna Theory and Design, 2nd Edition by Warren L. Stutzman PDF

By Warren L. Stutzman

Hugely revered authors have reunited to replace the well-known 1981 version that's nonetheless hailed as the best in its box. This variation comprises contemporary antenna techniques and purposes. It contains a succinct remedy of the finite distinction, time area (FDTD) computational approach. it's also the 1st textual content to regard actual idea of diffraction (PTD).

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Note that the definition of HP is the magnitude of the difference of the half-power points and the assignment of left and right can be interchanged without changing HP. In three dimensions, the radiation pattern major lobe becomes a solid object and the half-power contour is a continuous curve. If this curve is essentially elliptical, the pattern cuts that contain the major and minor axes of the ellipse determine what the IEEE defines as the principal half-power beamwidths. Antennas are often referred to by the type of pattern they produce.

We often refer to antennas as being broadside or endfire. A broadside antenna is one for which the main beam maximum is in a direction normal to the plane containing the antenna. An endfire antenna is one for which the main beam is in the plane containing the antenna. For a linear current on the z-axis, the broadside direction is () = 90° and the endfire directions are 0° and 180°. For example, an ideal dipole is a broadside antenna. For z-directed line sources, several patterns are possible.

Ard the definition of directivity, let us begin by recalling that the power radiatedI by an antenna from (1-29) is P = ff S· ds = ~ Re ff (E x H*) • ds (1-127) (1-128) I In general, there will be both {}- and qrcomponents ofthe radiation fields. From (1107), We find that . l (1-130) dO = element of solid angle = sin () d() dt/>, which is shown in Fig. 1-17. The integrrl can be evaluated over any surface enclosing the antenna; however, for simpliFity a spherical surface centered on the origin is usually used.

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