LINEAR ARRAYS: CURRENTS, IMPEDANCES, AND FIELDS, III
HARVARD UNIV CAMBRIDGE MA CRUFT LAB
Pagination or Media Count:
Results are given for the curtain array with three-quarter and one- half wavelength elements. Since the general solution assumes an indeterminate form, a special solution, based on the original Hallen integral equation, is given for arrays with half-wavelength elements. The new quasi zeroth-order theory shows that the conventional assumption of identical current distributions is justified only for the case of half-wavelength elements. The new array solution is extended to arrays with elements of unequal length. This extension follows from the modification of representations for the coupling terms which appear in the integral equation. Two separate cases are considered all elements driven by slice generators, and arrays with at least one parasitic element. Numerical calculations of the two-element parasitic couplet confirm the well-known phenomenon that the main radiation beam may be directed by adjusting the length of the parasitic element. The solution for the array with elements of unequal length is extended to the Yagi array. Numerical results are presented for a representative three-element Yagi array.
- Electrical and Electronic Equipment