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1. (WO2019032047) A CIRCULARLY POLARIZED ANTENNA FOR RADIO FREQUENCY ENERGY HARVESTING
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Claims

1 . A circularly polarized (CP) antenna for Radio Frequency energy harvesting comprising:

a top substrate;

a bottom substrate disposed on a ground plane;

a middle substrate disposed between the top substrate and the bottom substrate; a slotted patch comprising more than one slots, the slotted patch being disposed on the top substrate;

a slitted patch comprising a plurality of slits, the slitted patch being disposed between the top substrate and the middle substrate;

a microstrip feed line disposed between the middle substrate and the bottom substrate; and

a via connecting the slotted patch and the microstrip feed line to enable the slotted patch to be fed by the microstrip feed line,

wherein the more than one slots and the slits are arranged so as to generate more than one orthogonal modes with equal magnitude for receiving Radio Frequency (RF) signals.

2. The circularly polarized (CP) antenna as claimed in claim 1 , wherein the slitted patch comprises a via hole for the via to pass through the slitted patch.

3. The circularly polarized (CP) antenna as claimed in claim 1 , wherein the top substrate and bottom substrate have same thickness and the middle substrate has a thickness thicker than the thickness of the top substrate and bottom substrate.

4. The circularly polarized (CP) antenna as claimed in claim 1 , wherein the slotted patch is a slotted-circular-patch comprising two circular slots.

5. The circularly polarized (CP) antenna as claimed in claim 1 , wherein the slotted patch comprises two circular slots with a size ratio of 1 :6.

6. The circularly polarized (CP) antenna as claimed in claim 1 , wherein each of the plurality of slits is tapered and the plurality of slits are symmetrically arranged in the slitted patch.

7. The circularly polarized (CP) antenna as claimed in claim 1 , wherein the slitted patch is octagonal in shape and each of the plurality of slits is disposed at a location of a vertex of the slitted patch.

8. The circularly polarized (CP) antenna as claimed in claim 1 , wherein each of the plurality of slits is cut from an edge of the slitted patch towards a center of the slitted patch and the plurality of slits is cut at different length from one another.

9. The circularly polarized (CP) antenna as claimed in claim 8, wherein the plurality of slits has a difference in length of 0% to 6.35% between adjacent slits.

10. The circularly polarized (CP) antenna as claimed in claim 1 , wherein the received Radio Frequency (RF) signals are in GSM (Global System for Mobile communication) band and/or WiFi (Wireless Fidelity) band.

1 1 . A dual-band circularly polarized (CP) antenna for Radio Frequency energy harvesting comprising:

a top dielectric substrate;

a bottom dielectric substrate disposed on a ground plane;

a middle dielectric substrate disposed between the top dielectric substrate and the bottom dielectric substrate;

a slotted-circular-patch comprising two circular slots, the slotted-circular-patch being disposed on the top dielectric substrate;

a tapered-slit-octagon patch comprising eight tapered slits of different lengths symmetrically arranged in the tapered-slit-octagon patch and each of the eight tapered slits is disposed at a location of a vertex of the tapered-slit-octagon patch, the tapered-slit-octagon patch being disposed between the top dielectric substrate and the middle dielectric substrate;

a microstrip feed line disposed between the middle dielectric substrate and the bottom dielectric substrate; and

a via connecting the slotted-circular-patch and the microstrip feed line to enable the slotted-circular-patch to be fed by the microstrip feed line,

wherein the slitted patch comprises a via hole for the via to pass through the siitted patch,

wherein the circular slots and the eight tapered slits are arranged so as to generate two orthogonal modes with equal magnitude for receiving Radio Frequency (RF) signals in GSM (Global System for Mobile communication) band and WiFi (Wireless Fidelity) band,

wherein the top dielectric substrate and bottom dielectric substrate have same thickness and the middle dielectric substrate has a thickness thicker than the thickness of the top dielectric substrate and bottom dielectric substrate.

12. A circularly polarized (CP) rectenna comprising:

the antenna as claimed in claim 1 ;

a composite right/left handed (CRLH) transmission line (TL) impedance matching circuit; and

a voltage doubler circuit.

13. The circularly polarized (CP) rectenna as claimed in claim 12, wherein the CRLH TL impedance matching circuit is configured to produce two different phase shifts at two different frequencies.

14. The circularly polarized (CP) rectenna as claimed in claim 12, wherein the CRLH TL impedance matching circuit comprises metamaterial based CRLH TL.