A finite element method (FEM) based on the discretization of Helmholtz's equation is developed to analyze VHF and UHF antennas mounted on helicopter airframes, parts of which may include composite materials and anisotropies. The FEM code is implemented with linear edge-based tetrahedral elements and first/second order absorbing boundary conditions (ABC). Possible material anisotropies in the computational domain are accounted for by using a permittivity and a permeability tensor. Radiation characteristics are predicted for absolute gain, spatial field distribution, input impedance and return loss, and then compared with measurements for verification.
|Number of pages||4|
|Journal||IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)|
|Publication status||Published - 1998|