Unequal cross aperture coupled compact CP antenna with four Y-Shaped slits and normal slits

In this paper, the proposed antenna is microstrip patch antenna with four normal slits and four Y-shaped slits. The proposed antenna size is reduced by slits. The proposed antenna is compares with the conventional microstrip patch antenna with out the inserted slits. The proposed antenna size is 76% of conventional antenna. The CP(Circular polarization) of proposed antenna is not operated by conventional CP design. The CP proposed antenna is achieved by optimal unequal cross aperture coupled feeding structure, which is operated to excite two orthogonal resonance modes. The two orthogonal resonance modes are near-equal amplitudes and 90deg phase difference.