Patent ID: 7362274

Claim:
A coupled feed-in butterfly shaped left/right hand circularly polarized microstrip antenna comprising: a delta resonator; a butterfly shaped radiator having a pair of front wing tips and a pair of rear wing tips respectively formed symmetrically at two front side corners and two rear side corners thereof, at least one circular hole being formed between said two rear wing tips, a delta shaped cavity being opened in the middle of said butterfly shaped radiator, and a vertex angle being formed on said butterfly shaped radiator in front of said delta shaped cavity; an elongated rectangular feed line with a joint terminal and a joint hole formed at one end thereof, and a signal receiving node formed at the other end thereof; a connecting sheet disposed at the joint terminal of said elongated rectangular feed line, and connected to said butterfly shaped radiator; a cylindrical conductor erected on the joint hole of said elongated rectangular feed line with a proper space from the circular hole of said butterfly shaped radiator for adjusting the impedance bandwidth; and a feed-in terminal in connection with a signal receiving adapter so as to direct the signal to feed into said signal receiving node of said elongated rectangular feed line located above by induction.