2.3 Wide input received power rectennas

There are several studies that are proposed to guarantee stable fixed RF-DC conversion efficiency over a wide band of the input power. In [43], dual-band rectifier with extended input power range is proposed. The rectifier schematic circuit and the fabricated design is displayed in Figure 12. The rectifier offers above 30% conversion efficiency with input power range from 15 to 20 dBm and the

maximum value is 60% from 5 to 15 dBm. Impedance compression network (ICN) techniques is discussed in [44] to fix RF-dc conversion efficiency over a wide band of input power by maintaining the value of input impedance for the rectifier fixed

regardless the value of the input power. Figure 13 shows the rectifier configuration. The rectifier has a maximum conversion efficiency of 56% at 31.8 dBm and the

input power range for efficiency over than 50% is 6.7 dBm.

Figure 11.

Figure 12.

Figure 13.

161

Layout of the rectifier [44].

Fabricated reconfigurable rectenna [41].

Rectenna Systems for RF Energy Harvesting and Wireless Power Transfer

DOI: http://dx.doi.org/10.5772/intechopen.89674

Schematic diagram and fabricated circuit [43].

Rectenna Systems for RF Energy Harvesting and Wireless Power Transfer DOI: http://dx.doi.org/10.5772/intechopen.89674

Figure 11. Fabricated reconfigurable rectenna [41].

maximum value is 60% from 5 to 15 dBm. Impedance compression network (ICN) techniques is discussed in [44] to fix RF-dc conversion efficiency over a wide band of input power by maintaining the value of input impedance for the rectifier fixed

Recent Wireless Power Transfer Technologies

Figure 10.

160

(a) Triple band antenna, (b) rectifier design and a photo of a fabricated rectifier [40].

Figure 12. Schematic diagram and fabricated circuit [43].

regardless the value of the input power. Figure 13 shows the rectifier configuration. The rectifier has a maximum conversion efficiency of 56% at 31.8 dBm and the input power range for efficiency over than 50% is 6.7 dBm.
