Title :
Multi-feed NVIS realization on small aircraft using characteristic modes
Author :
Chalas, Jeffrey ; Sertel, Kubilay ; Volakis, John L.
Author_Institution :
ElectroScience Lab., Ohio State Univ., Columbus, OH, USA
Abstract :
Characteristic modes (CMs) are used to design an NVIS antenna system on-board an electrically small UAV. Using the CMs of the UAV platform, near-vertical incident skywave (NVIS) are realized using pre-specified locations for antenna mounting. The appropriate excitation level of each monopole feed can be computed in a systematic manner using the CMs of the composite UAV + monopole antenna system. Discussions on pattern and bandwidth of this approach as a function of feeding element number will be presented, as well as discussions on further optimization approaches that can be effectively utilized from a characteristic modes perspective.
Keywords :
aircraft antennas; antenna feeds; antenna radiation patterns; autonomous aerial vehicles; monopole antenna arrays; NVIS antenna system; UAV platform; antenna mounting; characteristic modes; composite UAV; electrically small UAV; feeding element number; monopole antenna system; monopole feed; multi-feed NVIS realization; near-vertical incident skywave; small aircraft; Bandwidth; Eigenvalues and eigenfunctions; Feeds; Least squares approximations; Mobile antennas; Reflector antennas; Characteristic modes; HF antennas; NVIS; Q; electrically small antennas;
Conference_Titel :
Antennas and Propagation (EuCAP), 2015 9th European Conference on
Conference_Location :
Lisbon
