Wideband rectenna and rectifying apparatus for rectenna

• US 9,472,849 B2
• Filed: 03/12/2015
• Issued: 10/18/2016
• 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: Choi, Jun Ho, So, Joon Ho, Shin, Jin Woo
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): SHIAO, DAVID A
• Application Number:
  US14/645,479
• Publication Number:
  US 20160094091A1
• Time in Patent Office: 586 Days
• Field of Search: None
• 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 rectifying apparatus comprising:

a harmonic rejecting filter having coupled microstrip lines and a first radial stub connected to one of the coupled microstrip lines at a first point, wherein the harmonic rejecting filter is configured to prevent re-radiation of radio frequency (RF) harmonics;

a matching circuit located at an output of the harmonic rejecting filter and configured to perform impedance matching between an antenna and a rectifying diode, the matching circuit having a second radial stub connected to said one of the coupled microstrip lines at a second point;

the rectifying diode located at an output of the said one of the coupled microstrip lines;

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 filter 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

wherein the fourth radial stub is connected to said one of the coupled microstrip lines at a location between the first point and the second point.

2. The apparatus of claim 1, wherein the coupled microstrip lines each operates as a band-pass filter.

3. The apparatus of claim 1, wherein the first radial stub is an open-circuited radial stub and operates as a band-stop filter.

4. The apparatus of claim 1, wherein the second radial stub comprises two radial stubs symmetric to each other.

5. The apparatus of claim 1, wherein the third radial stub comprises a single radial stub, and a pair of radial stubs symmetric to each other.

6. The apparatus of claim 1, wherein the fourth radial stub comprises a signal radial stub.

7. The apparatus of claim 1, wherein the harmonic rejecting filter blocks noise signals introduced from the antenna.

8. The apparatus of claim 1, wherein the first radial stub operates as a band-stop filter.

9. The apparatus of claim 1, wherein the first to fourth radial stubs each have an angle of circumference of 70°

.

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