“…They also allow for a plethora of design alternatives to improve the EM performances, normally based on three patch shapes, like rectangular [8,9,[11][12][13]15,18,20,22,[24][25][26]29,30], circular [21,23,31], and square [14,19], combined with different slotted patch configurations like linear [8,12,16,19,20,26,28,30], meandered [18], ramp [18], circular-ring [21], complex [17,22], L-shaped [29], and U-shaped [24]. Feeding techniques are also relevant when they are used for textile applications-coaxial fed [11,12,14,16,17,21,[23][24][25][26]28,31], microstrip line fed [9,10,…”