PATCH ANTENNA AND RECTENNA USING THE SAME

• US 20110242863A1
• Filed: 04/13/2010
• Published: 10/06/2011
• Est. Priority Date: 03/31/2010
• Status: Active Grant

• Current Assignee: Kookmin University
• Original Assignee: Kookmin University
• Inventors: SEO, Ki-won, PARK, Jun-seok, SEONG, Yeong-Rak, ROH, Hyoung-Hwan, OH, Ha-Ryoung
• Granted Patent: US 8,618,985 B2
• Time in Patent Office: Days
• US Class Current: 363/126
• CPC Class Codes: H01Q 1/248 provided with an AC/DC converting device, e.g. rectennas
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 9/0428 radiating a circular polarised wave
• 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 patch antenna for receiving high frequency wireless signal and a rectenna using the same, more particularly, an impedance-matched patch antenna adopting a slot capacitive coupling structure and a rectenna capable of generating electrical energy from the wireless signals having different frequency band. A rectenna for receiving an A.C. wireless signal carrying electrical energy and converting the wireless signal into a D.C. electrical energy, is comprised of: a patch antenna for receiving the wireless signal comprising an dielectric substrate, a patch that is formed at the upper area of the surface of the dielectric substrate and providing the first frequency response characteristics, a ground plane formed on the other surface of the dielectric substrate, and an impedance matching means providing the second frequency response characteristics; and a rectifying unit that converts the wireless signal, received via the patch antenna, into a D.C. electrical energy by rectifying the wireless signal.

Claims

1. A patch antenna comprising:

an dielectric substrate;

a patch that is formed on the first surface of the dielectric substrate and provides the first frequency characteristics; and

a ground plane that is formed on the second surface of the dielectric substrate,

wherein an impedance matching means, that is capacitively coupled with the patch, is formed on the one side of the ground plane.

2. The patch antenna according to claim 1, wherein the impedance matching means is comprised of:

a slot formed in the bottom area of the ground plane; and

a feeder line formed inside of the slot and being separated by a predetermined distance therefrom.

3. The patch antenna according to claim 2, wherein the feeder line is formed at a location where the feeder line can face the bottom area of the patch with the dielectric substrate interposed between one end of the feeder line and the patch.

4. The patch antenna according to claim 3, wherein the slot and the feeder line is to be formed in a T-shaped pattern,

wherein the feeder line is formed at a location where the bar-shaped head of the feeder line can face the bottom area of the patch so as to provide the second frequency characteristics by adjusting the size of the slot and the feeder line.

5. The patch antenna according to claim 4, wherein the patch is a hexagonal shape formed by etching off two facing corners of a square.

6. A rectenna for receiving an A.C. wireless signal carrying electrical energy, and converting the wireless signal into a D.C. electrical energy, comprising:

a patch antenna for receiving the wireless signal comprised of a dielectric substrate, a patch that is formed at the upper area of the surface of the dielectric substrate and provides the first frequency response characteristics, a ground plane formed on the other surface of the dielectric substrate, and an impedance matching means that provides the second frequency response characteristics; and

a rectifying unit for converting the wireless signal, received via the patch antenna, into a D.C. electrical energy by rectifying the wireless signal.

7. The rectenna to claim 6, wherein the rectifying unit is comprised of a voltage multiplying circuit that comprises at least one capacitor and diode and at least two of serially connected rectifying and multiplying stages capable of storing energy temporarily so as to convert the wireless signal into an electrical energy by rectifying the wireless signal and multiply the voltage of the converted electrical energy simultaneously.

8. The patch antenna according to claim 6, wherein the rectifying unit is further comprised of:

a grounding area that is being separated from the ground plane of the patch antenna; and

a bead that is located between the grounding area and the ground plane of the patch antenna for suppressing the effect of the A.C. signal.