Patent attributes
A coupled feed-in butterfly shaped left/right hand circularly polarized microstrip antenna includes a delta resonator, a butterfly shaped radiator, an elongated rectangular feed line, a connecting sheet, a cylindrical conductor, a signal receiving adapter, and a feed-in terminal. All the above components are disposed in parallel in the three dimensional space. The butterfly shaped radiator has a cavity formed at the position corresponding to the delta resonator. A pair of front wing tips and a pair of rear wing tips are respectively formed symmetrically at the front corners and the rear corners of the butterfly shaped radiator. The elongated rectangular feed line is electrically connected to the butterfly shaped radiator with the connecting sheet, and the cylindrical conductor is facing to a circular hole formed on the butterfly shaped radiator in the manner able to adjust the impedance bandwidth. With this structure, a left/right hand circularly polarized microstrip antenna having broader impedance and axial ratio bandwidth can be obtained.
