A new method of matching antenna array based on coupling impedance

Based on the introduction of mutual coupling coefficient Smnqp (the coupling coefficient between the mn array unit and the qp passive patch unit), a novel method for antenna array design is proposed. By analyses the relationship between coupling Smnqp and return loss Smn (m=n), gain, coupling coefficient Smn (m≠n) between array elements, it find out, proper Smnqp will lead to the decrease of Smn,(m=n). And assuming the gain keeps constant, the Smn (m≠n) should increase according to theory. We can change the Smnqp by changing the size of passive patch. If used properly, it can improve the of antenna array. Based on this conclusion, a 3×3 rectangular array is designed. Analysis of the simulation results,we can see that the proper size of passive patch can reduce the Smn,(m=n) with the antenna gain reduce.