study on antennas appropriate for low-power rectennas in …wpt/paper/wpt2013-35.pdf · 2017. 1....
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THE INSTITUTE OF ELECTRONICS, IEICE Technical Report INFORMATION AND COMMUNICATION ENGINEERS WPT2013-35(2014-03)
This article is a technical report without peer review, and its polished and/or extended version may be published elsewhere.
611-0011 E-mail: [email protected], [email protected], mitani.tomohiko.3u @rish.kyoto-u.ac.jp
RF-DC
RF-DC
Q RF-DC
RF-DC
Q
RF-DC Q
Study on Antennas Appropriate for Low-Power Rectennas in Microwave Power Transmission
Yan Zhou, Naoki Shinohara and Tomohiko Mitani
Research Institute for Sustainable Humanosphere, Kyoto Univ., Gokasho, Uji City, Kyoto Prefecture, Japan. 611-0011 E-mail: [email protected], [email protected], mitani.tomohiko.3u @rish.kyoto-u.ac.jp
Abstract We proposed two methods to improve the RF-DC conversion efficiency of a low input rectenna; one was to improve the impedance of the rectenna and the other was to design the high Q value antenna. To begin with, we proved that the efficiency of the rectifying circuit can be improved by raising characteristic impedance. Then we designed the high impedance patch antennas and obtained that the characteristics of patch antennas were independent of impedance. Next, we measured efficiency of low-power rectifying circuit connected with a high Q value patch antenna. We obtained higher conversion efficiency with a low Q value antenna, but which had a small reflection loss.
Keyword RF-DC conversion efficiency, rectenna, impedance, high Q value 1.1.
(MPT)
MPT RFID
MPT
RF-DC [1]
[2]
RF-DC
Q1
1 QQ
1. Q
-
2. 2.1.
ADS1.6 mm
2.65%
[3] 75 125125
1 AD1000
5070 80 90 100 2 2
g/4 F 50
22 100
0.1 mm 0.1 mm
100 1. AD1000
(h) 0.8
( r) 10.35
(tan ) 0.0023
2
2
[mm]
[mm]
50 0.72 13.00 70 0.41 25.02 80 0.28 17.92 90 0.19 25.84 100 0.12 26.53
3
3
3
3
41
2
Vout RL P in
P ref
4
[mm] (R)
[mm] (l1)
[mm] (l2)
[mm] 50 0.5 3 1.20 12.28 70 0.5 3 8.38 14.71 80 0.5 3 9.98 12.47 90 0.5 3 7.93 14.99 100 0.5 3 7.55 14.99
-
0.2 mW 25 mW5 1 mW 70 80
50 390 100
50 85 mW 70 80
50 6 1090 100
50 210 mW 70 80 90 100
5010 13 3 2
20 mW 70 80 90100 50
9 12 3 2
805 13
80
5
2.2. 4 0.4 mm NPC-F260A
506 100 150
7 100 150SMA
g/4SMA
4 NPC-F260A (h) 0.4
( r) 2.55
(tan ) 0.0015
6 50
7 100 150
826 cm
40 mW80 mW 160 mW...
8
-
9 50 100 150
10 50 100 150
RF-DC
2.44GHz
RF-DC50 100 150
9 9 1000 mW50 32 mW 100
30 mW 15028 mW
50 100 150RF-DC 10
50 g/4
10
50 -20dB 100-18dB 100
-8dB
RF-DC
3. Q 3
RF-DC1, 2, 3
115 5 110.35 0.8 mm
2, 3 2.55 0.4 mm2
33 2
3|S11| 12 2.48 GHz
1, 2, 3 |S11| -12 dB,-18 dB,-23 dB Q
Qu [4] 1, 2, 3 Qu30, 23.1, 18.44
11 1, 2, 3
12 3
|S11|
-
5 1, 2, 3
[mm]
1 10.35 0.8 2 2.6 1.6 3 2.6 1.6
1, 2, 3 RF-DC
132.48 GHz
ab
RF-DC
13(a)
13(b)
13 1, 2, 3 RF-DC
6RF-DC
0.5 mW, 1 mW 32 5 21 5%
1, 2, 3 RF-DC6
0.5 mW, 1 mW10 mW
3
RF-DC3 Q
RF-DC
6 1, 2, 3
RF-DC
[mW] 1 [%] 2 [%] 3 [%]
[%] 0.5 12.99 17.16 17.96 19.60 1 25.09 29.04 30.01 29.77 2 36.86 40.00 40.80 38.61 4 47.12 48.83 50.24 46.81
10 57.57 58.32 59.45 54.92 20 62.33 62.49 63.84 59.29 30 64.81 64.75 65.41 61.31
4. 50 70
80 90 100
8050 13
Q RF-DCQ
RF-DC
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