Radiation Efficiency Improvement Method for Multifeed Circular Polarization Antenna Array with Mutual Coupling Effect

Table 1

Measured input impedance of each port.

Port	𝑎1	𝑎2	𝑎3	𝑎4	𝑎5	𝑎6	𝑎7
Impedance	132+17∗𝑗	75−33∗𝑗	78−7∗𝑗	77−29∗𝑗	66−16∗𝑗	75−11∗𝑗	78−12∗𝑗
Port	𝑏1	𝑏2	𝑏3	𝑏4	𝑏5	𝑏6	𝑏7
Impedance	105−12∗𝑗	67+6∗𝑗	84−26∗𝑗	74−29∗𝑗	46+7∗𝑗	68−37∗𝑗	76−32∗𝑗