A wireless receiver apparatus, comprising: a resonator circuit, including: a first inductive element and a second inductive element that is connected to the first inductive element in series; a first capacitive element, connected to a first end of the first inductive element and a first output end of the resonator circuit; and a set of second capacitive elements (C2, C3) connected in series, the set of second capacitive elements (C2, C3) having one end connected between the first and second inductive elements (L1, L2) and having another end connected between the second inductive element and a second output end of the resonator circuit; and a rectifier circuit (110; 210), configured to provide rectification for a signal from the resonator circuit; wherein the rectifier circuit comprises: three sets of diodes (D1-D6) each set comprising two diodes connected in series, the three sets of diodes (D1-D6) including a first set of diodes (D1, D2), a second set of diodes (D3, D4), and a third set of diodes (D5, D6), that are connected in parallel; wherein the first output end of the resonator circuit is connected between the first set of diodes (D1, D2), the second output end of the resonator circuit is connected to the second set of diodes (D3, D4), and an intermediate end of the set of second capacitive elements (C2, C3) is connected to the third set of diodes (D5, D6), or wherein the rectifier circuit comprises: three sets of switches (S1-S6) each set comprising two switches connected in series, the three sets of switches including a first set of switches (S1, S2), a second set of switches (S3, S4), and a third set of switches (S5, S6), that are connected in parallel; wherein the first output end of the resonator circuit is connected between the first set of switches (S1, S2), the second output end of the resonator circuit is connected to the second set of switches (S3, S4), and an intermediate end of the set of second capacitive elements (C2, C3) is connected to the third set of switches (S5, S6). a resonator circuit, including: a first inductive element and a second inductive element that is connected to the first inductive element in series; a first capacitive element, connected to a first end of the first inductive element and a first output end of the resonator circuit; and a set of second capacitive elements (C2, C3) connected in series, the set of second capacitive elements (C2, C3) having one end connected between the first and second inductive elements (L1, L2) and having another end connected between the second inductive element and a second output end of the resonator circuit; and a first inductive element and a second inductive element that is connected to the first inductive element in series; a first capacitive element, connected to a first end of the first inductive element and a first output end of the resonator circuit; and a set of second capacitive elements (C2, C3) connected in series, the set of second capacitive elements (C2, C3) having one end connected between the first and second inductive elements (L1, L2) and having another end connected between the second inductive element and a second output end of the resonator circuit; and a rectifier circuit (110; 210), configured to provide rectification for a signal from the resonator circuit; three sets of diodes (D1-D6) each set comprising two diodes connected in series, the three sets of diodes (D1-D6) including a first set of diodes (D1, D2), a second set of diodes (D3, D4), and a third set of diodes (D5, D6), that are connected in parallel; wherein the first output end of the resonator circuit is connected between the first set of diodes (D1, D2), the second output end of the resonator circuit is connected to the second set of diodes (D3, D4), and an intermediate end of the set of second capacitive elements (C2, C3) is connected to the third set of diodes (D5, D6), three sets of switches (S1-S6) each set comprising two switches connected in series, the three sets of switches including a first set of switches (S1, S2), a second set of switches (S3, S4), and a third set of switches (S5, S6), that are connected in parallel; wherein the first output end of the resonator circuit is connected between the first set of switches (S1, S2), the second output end of the resonator circuit is connected to the second set of switches (S3, S4), and an intermediate end of the set of second capacitive elements (C2, C3) is connected to the third set of switches (S5, S6).