By A. W. Rudge, K. Milne, A. D. Olver, P. Knight
This e-book offers the basic historical past thought and analytical innovations of antenna layout. It bargains with a truly wide variety of antenna forms, working from very low frequencies to millimetre waves.
Also available:
Handbook of Antenna layout, Vol. 2 - ISBN 9780906048870
A guide for EMC checking out and dimension - ISBN 9780863417566
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Additional info for Handbook of Antenna Design, Vol. 1
Sample text
There is no unique definition for satisfactory performance and this will differ from application to application. Operating bandwidths are commonly defined in terms of both radiation pattern characteristics and input impedance or vswr requirements. Some typical examples are indicated below. Gain or directivity: The frequency range over which the gain or directivity is within specified limits. Beamwidth: The frequency-range over which the main beamwidth (specified at the half power point -3dB or at the -lOdB or -20dB levels) is within some specified limit.
The problem is simpler if the linear antenna is assumed to be infinitely thin so that the circumferential current flow can be neglected. The solution is then found by knowing the radiated fields of a differential element and integrating over the length of the antenna. The current distribution along the antenna is either known or can be approximated, allowing for end effects, to a sufficient accuracy for most practical purposes. The differential electric current element will be assumed to be positioned along the z axis, Fig.
An antenna receiving a plane wave from a given direction will pick up the maximum signal when the polarisation ellipse of the incident electric field has the same axial ratio, the same tilt angle and the same sense of polarisation as that of the receiving antenna in the given direction. If the polarisation of the incident wave does not match the polarisation of the receiving antenna then a polarisation loss occurs due to the mismatch. The amount of mismatch is given by the polarisation efficiency which is defined as the ratio of the power actually received by the antenna divided by the power that would be received if a wave came from the same direction and with the correct polarisation were incident on the antenna.