Spherical wave expansions for the radiated field from the source distributions on an enclosed surface are obtained in terms of spherical vector wave functions. It is shown that expansion coefficients can be modified using the field equivalence principles to yield simpler formulations. A program capable of computing the multipole coefficients and the radiation patterns of arbitrary aperture distribution is developed. Multipole coefficients for rectangular apertures with dimensions b much greater than a are computed using this program and are compared with those of the linear antenna with a similar excitation. Multipole coefficients and radiation patterns of uniform distribution are computed. Accuracy in numerical computations is investigated comparing results of far-field patterns obtained using spherical wave expansions and vector potential formulation. Experimental verification of the theory is carried out for an H-plane sectoral horn.
|Original language||English (US)|
|Number of pages||4|
|Journal||AEU-Archiv fur Elektronik und Ubertragungstechnik|
|State||Published - Jan 1 1975|
All Science Journal Classification (ASJC) codes
- Computer Networks and Communications
- Electrical and Electronic Engineering