A multiple beam array antenna system including a first group of right-handed circularly polarized subarrays and a second group of left-handed circularly polarized subarrays. Combined signals from the right-handed subarrays are output via low noise amplifiers to a first electromagnetic lens while the...http://www.google.com/patents/US6198449?utm_source=gb-gplus-sharePatent US6198449 - Multiple beam antenna system for simultaneously receiving multiple satellite signals
