Design of a Small-Size Broadband Circularly Polarized Microstrip Antenna Array

Figure 6

Effects of the length of the U-slot’s vertical arm. (a) Realized gain and axial ratio of the element. (b) Reflection coefficient of the element. (c) Realized gain and axial ratio of the array. (d) Reflection coefficient of the array.

(a)

(b)

(c)

(d)