Self-Decoupling in Circularly Polarized Patch Array by CM/DM Cancellation Method

In this paper, a self-decoupling method based on mode cancellation is proposed for 1×2 circularly polarized patch arrays with same and opposite rotating senses. By means of the common mode and differential mode theory, a simple analysis about the mutual couplings is present. Perfect coupling can be obtained by only adjusting the dimensions of the ground without additional decoupling structures. Excellent simulation results show that within the frequency bandwidth of 3.4-3.8 GHz, the antennas’ S12 can be under -30 dB, and the axial ratio is less than 3 dB.