Broadband rectenna
First Claim
1. An apparatus comprising:
- an antenna configured to receive a radio frequency signal, wherein the antenna comprises;
a first off-center-fed dipole,a second off-center-fed dipole, anda center-fed dipole; and
a rectifying circuit connected to the antenna and configured to convert alternating current power generated by the antenna to direct current power.
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Accused Products
Abstract
A rectenna for high efficiency RF-to-DC wireless energy harvesting that includes an off-center-fed dipole antenna and a rectifying circuit, wherein the rectifying circuit comprises at least one rectifying diode. The input impedance of the antenna may be directly conjugate matched to the impedance of the rectifying circuit over a wide range of frequencies and/or under different operating conditions. The impedance matching network required by a conventional rectenna system may therefore be eliminated using the methods disclosed for the design and implementation of the rectenna. The rectenna offers consistently high RF-to-DC power conversion efficiency over a wide range of frequencies and under different operating conditions. The rectenna may be connectible to a rectifying circuit utilizing different types of rectifying diodes.
42 Citations
20 Claims
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1. An apparatus comprising:
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an antenna configured to receive a radio frequency signal, wherein the antenna comprises; a first off-center-fed dipole, a second off-center-fed dipole, and a center-fed dipole; and a rectifying circuit connected to the antenna and configured to convert alternating current power generated by the antenna to direct current power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus comprising:
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an off-center-fed dipole antenna comprising at least six dipole arms configured to receive radio-frequency signals; and a rectifying circuit configured to convert the radio-frequency signals received by the off-center-fed dipole antenna to direct current power, and wherein an impedance of the off-center-fed dipole antenna and an impedance of the rectifying circuit are conjugate matched to within a −
6 dB reflection coefficient. - View Dependent Claims (13, 14, 15)
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16. An apparatus comprising:
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an antenna comprising three or more dipoles including one or more symmetric dipoles and one or more asymmetric dipoles; a coplanar stripline comprising a first conducting strip and a second conducting strip; and a rectifying circuit connected to the three or more dipoles of the antenna via the coplanar stripline, wherein the rectifying circuit comprises a rectifying diode connected between the first conducting strip and the second conducting strip, and wherein an input impedance of the antenna is conjugate matched to an impedance of the rectifying diode such that a reflection coefficient between the antenna and the rectifying diode is less than −
6 dB. - View Dependent Claims (17, 18, 19, 20)
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Specification