By Collin, Robert E.; Zucker, Francis J
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Additional resources for Antenna theory
McGrath and V. P. Pyati, “Phased Array Antenna Analysis with Hybrid Finite Element Method,” IEEE Trans. , Vol. 42, No. 12, pp. 1625–1630, December 1994. 62. W. Sun and C. A. Balanis, “Vector One-Way Wave Absorbing Boundary Condition for FEM Applications,” IEEE Trans. , Vol. 42, No. 6, pp. 872–878, June 1994. 63. E. W. Lucas and T. P. Fontana, “A 3-D Hybrid Finite Element/Boundary Element Method for the Unified Radiation and Scattering Analysis of General Infinite Periodic Arrays,” IEEE Trans. , Vol.
15(c). Thus the fields radiated by the two arms of the dipole (vertical parts of a flared transmission line) will primarily reinforce each other toward most directions of observation (the phase due to the relative position of each small part of each arm must also be included for a complete description of the radiation pattern formation). If the diameter of each wire is very small (d ≪ λ), the ideal standing wave pattern of the current along the arms of the dipole is sinusoidal with a null at the end.
With arrays, it is practical not only to synthesize almost any desired amplitude radiation pattern, but the main lobe can be scanned by controlling the relative phase excitation between the elements. This is most convenient for applications where the antenna system is not readily accessible, especially for spaceborne missions. The beamwidth of the main lobe along with the side lobe level can be controlled by the relative amplitude excitation (distribution) between the elements of the array. In fact, there is a trade-off between the beamwidth and the side lobe level based on the amplitude distribution.
Antenna theory by Collin, Robert E.; Zucker, Francis J