Antenna Theory - FAQ's With Answers - 5.
This page contains basic questions and short notes on some of the keywords on antenna theory: 21) What is meant by cross field? Normally the electric field E is perpendicular to the direction of wave propagation. In some situation the electric field E is parallel to the wave propagation that condition is called Cross field. 22) Define axial ratio? The ratio of the major to the minor axes of the polarization ellipse is called the Axial Ratio (AR). 23) What is meant by Beam Area? The beam area or beam solid angle or WA of an antenna is given by the normalized power pattern over a sphere. WA = ò ò4p Pn ( q,f ) dW Where dW = Sin q dq.df 24) What is duality of antenna? It is defined as an antenna is a circuit device with a resistance and temperature on the one hand and the space device on the other with radiation patterns, beam angle, directivity gain and aperture. 25) State Poynting theorem? It states that the vector product of electric field intensity vector ...