WIDEBAND RECTENNA AND RECTIFYING APPARATUS FOR RECTENNA

• US 20160094091A1
• Filed: 03/12/2015
• Published: 03/31/2016
• Est. Priority Date: 09/25/2014
• Status: Active Grant

• Current Assignee: Agency For Defense Development (Government of The Republic of China)
• Original Assignee: Agency For Defense Development (Government of The Republic of China)
• Inventors: SHIN, Jin Woo, CHOI, Jun Ho, SO, Joon Ho
• Granted Patent: US 9,472,849 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01Q 1/248 provided with an AC/DC converting device, e.g. rectennas
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/0414 in a stacked or folded configuration
• CPC Class Codes: H01Q 9/0435 using two feed points
• CPC Class Codes: H01Q 9/0457 electromagnetically coupled to the feed line
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/27 characterised by the type of receiving antennas, e.g. rectennas

Abstract

A rectenna according to the present invention includes a circular-polarized patch antenna having dual slots fed by a microstrip and configured to receive and output a radio frequency (RF) signal, and a rectifying circuit configured to convert for output the RF signal, received by the circular-polarized patch antenna, into a direct current (DC) signal and transfer the DC signal from the antenna to a load, wherein the rectifying circuit comprises at least one radial stub.

Claims

1. A rectenna comprising:

a circular-polarized patch antenna configured to receive a radio frequency (RF) signal; and

a rectifying circuit configured to convert for output the RF signal, received by the circular-polarized patch antenna, into a direct current (DC) signal and transfer the DC signal from the antenna to a load,

wherein the rectifying circuit comprises at least one radial stub.

2. The rectenna of claim 1, wherein the radial stub comprises at least one of a first radial stub used for rejecting harmonics of the RF signal, a second radial stub used for impedance matching between the antenna and a rectifying diode, a third radial stub used for the DC power transfer, and a fourth radial stub used for lowering an RF ripple voltage to stably supply the DC power to the load.

3. The rectenna of claim 2, wherein the first radial stub operates as a band-stop filter.

4. The rectenna of claim 1, wherein the circular-polarized patch antenna comprises:

a first patch substrate with a first patch disposed thereon;

a second patch substrate with a second patch disposed thereon;

a foam substrate disposed between the first patch substrate and the second patch substrate; and

a feed line substrate attached to a lower portion of the second patch.

5. The rectenna of claim 4, wherein the feed line substrate comprises:

H-shaped dual slots;

T-shaped feed lines configured to feed the H-shaped dual slots; and

a power divider configured to divide power to the feed lines.

6. The rectenna of claim 1, wherein the rectifying circuit comprises:

a harmonic rejecting unit configured to prevent re-radiation of RF harmonics, the harmonic rejecting unit having coupled microstrip lines and a first radial stub;

a matching unit located at an output of the harmonic rejecting unit and configured to perform impedance matching between the antenna and a rectifying diode, the matching unit having a second radial stub;

a rectifying diode located at an output of the matching unit;

a direct current (DC)-pass filter having a third radial stub and configured to attenuate RF output by the rectifying diode to transfer DC power; and

a DC return unit having a fourth radial stub and configured to lower a ripple voltage from a signal output by the DC-pass filter so as to supply the DC power stably to the load.

7. The rectenna of claim 6, wherein the harmonic rejecting unit blocks noise signals introduced from the antenna.

8. The rectenna of claim 6, wherein the coupled microstrip lines each operates as a band-pass filter.

9. The rectenna of claim 1, wherein the radial stub has an angle of circumference of 70°

.

10. The rectenna of claim 1, wherein the rectifying circuit has an operating frequency near 9.5 GHz.

11. A rectifying apparatus comprising:

a harmonic rejecting unit having coupled microstrip lines and a first radial stub and configured to prevent re-radiation of radio frequency (RF) harmonics;

a matching unit located at an output of the harmonic rejecting unit and configured to perform impedance matching between an antenna and a rectifying diode, the matching unit having a second radial stub;

a rectifying diode located at an output of the matching unit;

a direct current (DC)-pass filter having a third radial stub and configured to attenuate RF output by the rectifying diode to transfer DC power; and

a DC return unit having a fourth radial stub and configured to lower a ripple voltage from a signal output by the DC-pass filter so as to supply the DC power stably to a load.

12. The apparatus of claim 11, wherein the coupled microstrip lines each operates as a band-pass filter.

13. The apparatus of claim 11, wherein the first radial stub is an open-circuited radial stub and operates as a band-stop filter.

14. The apparatus of claim 11, wherein the second radial stub comprises two radial stubs symmetric to each other.

15. The apparatus of claim 11, wherein the third radial stub comprises a single radial stub, and a pair of radial stubs symmetric to each other.

16. The apparatus of claim 11, wherein the fourth radial stub comprises a signal radial stub.

17. The apparatus of claim 11, wherein the harmonic rejecting unit blocks noise signals introduced from the antenna.

18. The apparatus of claim 11, wherein the first radial stub operates as a band-stop filter.

19. The apparatus of claim 11, wherein the first to fourth radial stubs each has an angle of circumference of 70°

.

20. The apparatus of claim 11, wherein the rectifying apparatus has an operating frequency near 9.5 GHz.