Adaptive Polarization of Antennas
Abstract
Antennas whose polarizations are not aligned for optimal power transfer create a polarization mismatch and a loss in transferred power. A compensation for polarization mismatch is considered using a pair of crossed dipoles. One of the dipoles amplitude and phase is adjusted by a MATLAB optimization, and the Numerical Electromagnetic Code generates the electromagnetic response. Optimizing only for circular polarization produces losses in radiated power that offset the polarization correction. With minimum dipole separation, minor improvements are possible for 0 < 15 deg F, but at larger angles the optimizer decreases the power transferred. The polarization optimization improves power transferred when the dipole spacing is increased. At 0.5 wavelength spacing, the increase in total gain is up to 17 dB. The optimization was modified to consider power transferred, and the power always increased up to a maximum of 2.0 dE at 0 = 800. Crossed dipoles as the transmitter and receiver were also considered and they improved the power transferred.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2001
- Accession Number
- ADA396162
Entities
People
- Brian D. Griffin
Organizations
- Air Force Institute of Technology