TY  - JOUR
T1  - Trade off Between the Aperture Taper and Spillover Efficiencies of Prime Focus Reflector Antenna
AU - , Boualleg Ahcene AU - , Merabtine Nadjim AU - , Benslama Malek 
JO  - Journal of Engineering and Applied Sciences
VL  - 2
IS  - 1
SP  - 45
EP  - 48
PY  - 2007
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2007.45.48
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2007.45.48
KW  - Parabolic dish antenna
KW  -aperture efficiency
KW  -spillover efficiency
KW  -illumination efficiency
AB  - In this study, we use a point source at the focus, so that energy would radiate uniformly in all directions both in magnitude and in phase. The problem is that the energy that is not radiated toward the reflector will be wasted. What we really want is a feed antenna that only radiates toward the reflector and has a phase pattern that appears to radiate from a single point If we can illuminate the whole reflector, then we should be using the whole aperture. However, when we look more closely at the parabolic surface, we find that the focus is farther from the edge of the reflector then from the centre, because a part of the feed radiation misses the reflector; this loss called spillover. Another part of the feed energy is reflected back into the feed and doesn`t become part of the main beam; this loss is referred to as feed blockage. Ideally, all areas of the reflector should be illuminated with equal energy from the feed.
ER  -