Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.750z&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Other
Scientific paper
to the transmitter antenna aperture therefore reducing the length of connection cables between them and resulting in a more compact system. A 10 dB Gaussian taper is generally used in wireless power transmitters for optimum collection efficiency at the rectenna. However, the electronic modules being very close to the transmitter will undergo some severe temperature levels, especially around the center of the platform, unless the taper is optimized to take into account those constraints. For the sandwich configuration, tapers with reduced thermal constraints at the center were considered such as split beam tapers which can be realized using radial polarization through a slot antenna. For each studied case, the results were calculated using WEFF, a computer program developed at Texas A&M University for power transmission analysis. The specifications of the system are the distance (36,800 km) between the antenna at geosynchronous orbit and the Earth based rectenna, the DC output power from the rectenna (1.2 GW), and the circular antenna aperture size (diameter of 0.5 km). efficiency but also on the sidelobe levels and directivity of the radiation pattern. It was found that the most appropriate taper in terms of collection efficiency with a looser thermal constraint at the center of the transmitter aperture is a Split Gaussian with 89.7 % of collection efficiency and -22.0 dB of sidelobe level. Also, two other cases of a Gaussian taper with an attenuated center region presented 89.5 % and 88.9 % of collection efficiency. All these optimal split tapers exhibit a power attenuation of 20 % at the center and sidelobe levels under -19 dB. Both kinds of taper, namely the Split Gaussian and the Gaussian with an attenuated center region, present collection efficiencies close to that of the reference 10 dB Gaussian beam (90 %). Although the Split Gaussian presents the highest efficiency (89.7 %), in practice, the Gaussian taper with an attenuated center region could result in the highest collection efficiency. This is because of the ease of fabrication for a smoother dip at the center of the taper leading to a better agreement between the theoretical and measured taper.
Chang Kai
Little Frank
Zepeda Paola
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