A wireless power system module, comprising: a first inductive element (2802; R, L) comprising first and second terminals; an electrical circuit connected to the first and second terminals, the electrical circuit comprising a first circuit part (Part A), a second circuit part (Part B), a third terminal (V 1), and a fourth terminal (V 2), wherein the first circuit part (Part A) comprises: a first fixed capacitive element (2C 3) having a first side connected to the first terminal; a fourth fixed capacitive element (2C 3) having a first side connected to the second terminal; and a second adjustable capacitive element (C 1) connected between the first fixed capacitive element (2C 3) and the fourth fixed capacitive element (2C 3) at respective second sides of the first and fourth fixed capacitive elements (2C 3), forming a closed electrical path comprising a first path portion between the first fixed (2C 3) and second adjustable (C 1) capacitive elements, and a second path portion between the second adjustable (C 1) and fourth fixed (2C 3) capacitive elements; wherein the second circuit part (Part B) comprises a third adjustable capacitive element (2C 2) having a first side connected to the first path portion; wherein the second circuit part further comprises a fifth adjustable capacitive element (2C 2) having a first side connected to the second path portion; wherein the third terminal (V 1) is connected to a second side of the third adjustable capacitive element (2C 2) of the second circuit part (Part B); and wherein the fourth terminal (V 2) is connected to a second side of the fifth adjustable capacitive element (2C 2) of the second circuit part (Part B); wherein the third terminal (V 1) and the fourth terminal (V 2) are driven antisymmetrically, wherein capacitance values of the first (2C 3) and fourth (2C 3) fixed capacitive elements are nominally the same, and wherein the third (2C 2) and fifth (2C 2) adjustable capacitive elements are a pair of equal-value adjustable capacitors. a first inductive element (2802; R, L) comprising first and second terminals; an electrical circuit connected to the first and second terminals, the electrical circuit comprising a first circuit part (Part A), a second circuit part (Part B), a third terminal (V 1), and a fourth terminal (V 2), wherein the first circuit part (Part A) comprises: a first fixed capacitive element (2C 3) having a first side connected to the first terminal; a fourth fixed capacitive element (2C 3) having a first side connected to the second terminal; and a second adjustable capacitive element (C 1) connected between the first fixed capacitive element (2C 3) and the fourth fixed capacitive element (2C 3) at respective second sides of the first and fourth fixed capacitive elements (2C 3), forming a closed electrical path comprising a first path portion between the first fixed (2C 3) and second adjustable (C 1) capacitive elements, and a second path portion between the second adjustable (C 1) and fourth fixed (2C 3) capacitive elements; wherein the second circuit part (Part B) comprises a third adjustable capacitive element (2C 2) having a first side connected to the first path portion; wherein the second circuit part further comprises a fifth adjustable capacitive element (2C 2) having a first side connected to the second path portion; wherein the third terminal (V 1) is connected to a second side of the third adjustable capacitive element (2C 2) of the second circuit part (Part B); and wherein the fourth terminal (V 2) is connected to a second side of the fifth adjustable capacitive element (2C 2) of the second circuit part (Part B); wherein the third terminal (V 1) and the fourth terminal (V 2) are driven antisymmetrically, wherein capacitance values of the first (2C 3) and fourth (2C 3) fixed capacitive elements are nominally the same, and wherein the third (2C 2) and fifth (2C 2) adjustable capacitive elements are a pair of equal-value adjustable capacitors. a first fixed capacitive element (2C 3) having a first side connected to the first terminal; a fourth fixed capacitive element (2C 3) having a first side connected to the second terminal; and a second adjustable capacitive element (C 1) connected between the first fixed capacitive element (2C 3) and the fourth fixed capacitive element (2C 3) at respective second sides of the first and fourth fixed capacitive elements (2C 3), forming a closed electrical path comprising a first path portion between the first fixed (2C 3) and second adjustable (C 1) capacitive elements, and a second path portion between the second adjustable (C 1) and fourth fixed (2C 3) capacitive elements; wherein the second circuit part (Part B) comprises a third adjustable capacitive element (2C 2) having a first side connected to the first path portion; wherein the second circuit part further comprises a fifth adjustable capacitive element (2C 2) having a first side connected to the second path portion; wherein the third terminal (V 1) is connected to a second side of the third adjustable capacitive element (2C 2) of the second circuit part (Part B); and wherein the fourth terminal (V 2) is connected to a second side of the fifth adjustable capacitive element (2C 2) of the second circuit part (Part B); wherein the third terminal (V 1) and the fourth terminal (V 2) are driven antisymmetrically, wherein capacitance values of the first (2C 3) and fourth (2C 3) fixed capacitive elements are nominally the same, and wherein the third (2C 2) and fifth (2C 2) adjustable capacitive elements are a pair of equal-value adjustable capacitors.