Table 1 Wireless power transfer state-of-the-art.

From: Quasioptics for increasing the beam efficiency of wireless power transfer systems

Year

Team

L1

Freq.

#2

D3

FOM

\(\eta _{Beam}\)

FOM

FOM

Ref.

(m)

(GHz)

(m)

Dim.

(%)

Beam\(_1\)

Beam\(_2\)

1964

W. Brown

7.62

2.45

1

2.89

17.38

50.9

14.46

8.87

8

1974

W. Brown4

1.7

2.45

0

1.3

9.58

94

9.31

9.01

9

1975

W. Brown5

1540

2.388

1

26

53.84

11.3

44.37

6.08

10

2011

Gonzalez6

0.136

799-938

2

0.03

26.14

60

23.92

15.69

21

2016

Gowda

0.4

5.8

0

0.217

8.53

33.2

3.74

2.83

30

2022

Pereira7

5

5.8

2

1.06

20.57

63.75

18.68

13.32

N.A.

  1. The beam efficiency is as defined in Eq. (5), including all the components except the microwave generation, rectification and the cable losses. Finally, the figures of merits (FOM) are described in Eqs. (1), (2), and (3).
  2. 1Power transfer distance.
  3. 2Number of focusing components.
  4. 3Largest component dimension.
  5. 4Highest DC-DC efficiency.
  6. 5Highest outputted DC power.
  7. 6WPT in the Fresnel zone.
  8. 7This work, quasioptical WPT.
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