By A. Z. Fradin (Auth.)
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Additional resources for Microwave Antennas
Here the energy is continuously scattered from the surfaces of these antennas. In other words, in the given case, diffraction of electromagnetic waves takes place from the surface of a dielectric rod (tube) or from the sur face of the guide. Thus, microwave antennas, apeurt from a conductor element, have a diffracting element, forming the directional pattern by the process of diffraction of the electromagnetic wave from some part of the surface of this element. • In many cases microwave antennas, as we have seen, have a third element as well, a waveguide channelling energy from the first element to the second.
2 5 ) are employed for calculating the electromagnetic field in the volume V . a 4 . The Vector Potential Method Frequently the method of vector potentials is adopted to solve equations ( 2 . 1 ) . The auxiliary vector functions A® and are introduced, related to the field vectors Ε and fl by the following identities Té. Ε f a ^ A % j L // I grad div A^'-ToiA'^, : - j^uA'^J^ grad d iivvA°'+ / ω δ ί ^ 4 - Λ erad > + rot Substitution of ( 2 . 2 6 ) in. ^ 2 . 27) • As well as the vector potential certain authors employ the Hertzian vector related to A by the identity Í = 7ω /7.
18) By here we mean the magnetic charge, introduced into consideration for reasons similar to the introduction of the magnetic currents j"^ and related to the latter by div7"'=-yp°^. Thus, by using the auxiliary sources method we^have obtained the exact values of the vectors Ε and Η for the m m arbitrary point M, expressed through the volume distribution of electric and magnetic currents and charges J , and through the vectors Ε and Η of the field at the given surface S. 15) ancL ( 2 . 1 7 ) , ^oth directly and in different form, are widely used below for calculation of radiation fields.