Broadband rectenna
First Claim
1. An apparatus comprising:
- an off-center-fed dipole antenna configured to receive a radio frequency (RF) signal, wherein the off-center-fed dipole antenna comprises;
a substrate;
a first off-center-fed dipole, including a first arm and a second arm disposed on the substrate;
a second off-center-fed dipole, including a third arm and a fourth arm disposed on the substrate;
a center-fed dipole, including a fifth arm and a sixth arm disposed on the substrate; and
a coplanar stripline disposed on the substrate, the coplanar stripline having a first conducting strip that connects to the first, the fourth, and the fifth arms, and having a second conducting strip that connects to the second, the third, and the sixth arms; and
a rectifying circuit connected to the coplanar stripline and configured to convert alternating current (AC) power generated by the off-center-fed dipole antenna to direct current (DC) power, wherein the rectifying circuit comprises a rectifying diode connected between the first conducting strip and the second conducting strip, an inductor serially connected between the second conducting strip and a third conducting strip, and a capacitor connected between the first conducting strip and the third conducting strip.
1 Assignment
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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.
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Citations
19 Claims
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1. An apparatus comprising:
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an off-center-fed dipole antenna configured to receive a radio frequency (RF) signal, wherein the off-center-fed dipole antenna comprises; a substrate; a first off-center-fed dipole, including a first arm and a second arm disposed on the substrate; a second off-center-fed dipole, including a third arm and a fourth arm disposed on the substrate; a center-fed dipole, including a fifth arm and a sixth arm disposed on the substrate; and a coplanar stripline disposed on the substrate, the coplanar stripline having a first conducting strip that connects to the first, the fourth, and the fifth arms, and having a second conducting strip that connects to the second, the third, and the sixth arms; and a rectifying circuit connected to the coplanar stripline and configured to convert alternating current (AC) power generated by the off-center-fed dipole antenna to direct current (DC) power, wherein the rectifying circuit comprises a rectifying diode connected between the first conducting strip and the second conducting strip, an inductor serially connected between the second conducting strip and a third conducting strip, and a capacitor connected between the first conducting strip and the third conducting strip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
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an off-center-fed dipole antenna comprising at least six dipole arms that are configured to receive radio frequency (RF) signals; a coplanar stripline comprising a first conducting strip, a second conducting strip, and connections to the at least six dipole arms; and a rectifying circuit connected to the off-center-fed dipole antenna via the coplanar stripline, wherein the rectifying circuit comprises a rectifying diode connected between the first conducting strip and the second conducting strip, an inductor serially connected between the second conducting strip and a third conducting strip, and a capacitor connected between the first conducting strip and the third conducting strip, wherein the rectifying circuit is configured to convert the RF signals received by the off-center-fed dipole antenna to direct current (DC) power, and wherein an impedance of the off-center-fed dipole antenna is conjugate matched to an impedance of the rectifying circuit. - View Dependent Claims (12, 13, 14)
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15. An apparatus comprising:
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an antenna comprising three or more dipoles including at least one symmetric dipole and an asymmetric dipole; a coplanar stripline comprising a first conducting strip, a second conducting strip, and connections to the three or more dipoles; and a rectifying circuit connected to 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, an inductor serially connected between the second conducting strip and a third conducting strip, and a capacitor connected between the first conducting strip and the third conducting strip, and wherein an input impedance of the antenna is conjugate matched to an impedance of the rectifying circuit to within 50 percent resulting in a reflection coefficient smaller than −
6 dB. - View Dependent Claims (16, 17, 18, 19)
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Specification