Fig 1.
RF-to-DC converter block diagram.
Fig 2.
Schematic of 4-stage CWVM topology.
Fig 3.
Impedance matching at 900 MHz using Smith chart.
Table 1.
Lumped components and corresponding distributed elements dimensions (mm) for 900 MHz converter.
Fig 4.
Schematics of RF-to-DC converters working in GSM-900 band utilizing: (a) lumped L-type IMN. (b) Distributed L-type IMN.
Fig 5.
Return loss response of single-port single-band (900 MHz) converter.
Table 2.
Optimized distributed elements dimensions for dual-band (890 and 1850 MHz) converter.
Fig 6.
Return loss response of single-port dual-band (890 and 1850 MHz) converter.
Fig 7.
Impedance matching at 2.45 GHz using smith chart.
Table 3.
Lumped components and corresponding distributed elements dimensions (mm) for 2.45 GHz converter.
Fig 8.
Schematics of RF-to-DC converters working in WiFi-2.45 GHz band utilizing:
(a) Lumped -type IMN. (b) Distributed
-type IMN.
Fig 9.
Return loss response of single-port single-band (2.45 GHz) Converter.
Table 4.
Optimized distributed elements dimensions for triple band (1775 MHz, 2.25 GHz, and 2.45 GHz) converter.
Fig 10.
Return loss response of single-port triple-band (1775 MHz, 2.25 GHz, and 2.45 GHz) converter.
Fig 11.
Hexa band converter schematic.
Fig 12.
Proposed impedance matching networks.
(a) L-type matching network. (b) -Type matching network.
Fig 13.
Return Loss for Input Ports of the Proposed converter.
( a) Return Loss for Port-1. ( b) Return Loss for Port-2.
Fig 14.
Prototype performance validation.
( a) Top view. ( b) Bottom view. ( c) Experimental setup.
Fig 15.
Single-port single-band GSM-900 converter efficiency performance against varying (a) Rout. (b) Pin.
Fig 16.
Single-port single-band 2.45 GHz converter efficiency performance against varying (a) Rout. (b) Pin.
Fig 17.
Single-port dual-band converter efficiency performance against varying, (a) Rout. (b) Pin.
Fig 18.
Single-port triple-band converter efficiency vs Rout curve at constant input power. (a) Pin = –10 dBm. (b) Pin = 0 dBm. (c) Pin = 10 dBm.
Fig 19.
Single-port triple-band converter efficiency vs Pin curve at different Rout values. (a) Rout = 10 k. (b) Rout = 12 k
. (c) Rout = 18 k
.
Fig 20.
hexa band converter efficiency vs Rout curve at constant input power.
( a) Pin = –10 dBm. ( b) Pin = 0 dBm. ( c) Pin = 10 dBm.
Fig 21.
Hexa band converter efficiency vs Pin curve at different rout values. (a) Rout = 10 k. (b) Rout = 18 k
.
Table 5.
Summarized dual-port hexa-band converter peak efficiency performance.
Table 6.
Comparison of proposed converter with some other designs in literature.