REFLECTION FREQUENCY CONVERSION DEVICE USING ACTIVE METAMATERIAL SURFACE AND ECM SYSTEM

• US 20170141477A1
• Filed: 11/14/2016
• Published: 05/18/2017
• Est. Priority Date: 11/13/2015
• Status: Active Grant

• Current Assignee: Kyungpook National University
• Original Assignee: Kyungpook National University
• Inventors: KIM, Hongjoon, PARK, Hongwoo, HAN, Heeje, PARK, Soonwoo
• Granted Patent: US 10,498,042 B2
• Time in Patent Office: Days
• CPC Class Codes: H01Q 15/0066 said selective devices being reconfigurable, tunable or controllable, e.g. using switches
• CPC Class Codes: H01Q 15/0086 said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials

Abstract

A reflection frequency conversion device using an active metamaterial surface comprising: a plate-shaped active metamaterial surface which is configured to continuously convert a phase of a reflected wave by changing surface impedance characteristics in accordance with input voltage; and an arbitrary waveform generator which provides a voltage waveform capable of linearly changing the phase of the reflected wave in accordance with time to the metamaterial surface, where a reflection frequency generated on the metamaterial surface is converted in accordance with a frequency of the voltage waveform provided from the arbitrary waveform generator, where a plurality of metamaterial unit structures are periodically disposed on the metamaterial surface, and where the metamaterial unit structure is a high impedance surface (HIS) provided with a variable capacitor, and the capacitance of the variable capacitor is changed in accordance with applied voltage to change the phase of the reflected wave.

Claims

1. A reflection frequency conversion device using an active metamaterial surface comprising:

a plate-shaped active metamaterial surface which is configured to continuously convert a phase of a reflected wave by changing surface impedance characteristics in accordance with input voltage; and

an arbitrary waveform generator which provides a voltage waveform capable of linearly changing the phase of the reflected wave in accordance with time to the metamaterial surface,

wherein a reflection frequency generated on the metamaterial surface is converted in accordance with a frequency of the voltage waveform provided from the arbitrary waveform generator,

wherein a plurality of metamaterial unit structures are periodically disposed on the metamaterial surface, and

wherein the metamaterial unit structure is a high impedance surface (HIS) provided with a variable capacitor, and the capacitance of the variable capacitor is changed in accordance with applied voltage to change the phase of the reflected wave.

2. The reflection frequency conversion device as claimed in claim 1, wherein in the metamaterial unit structure, a dielectric plate with a predetermined thickness is disposed between a conductive lower plate and upper plate;

the upper plate comprises a band-type first pattern plate with a hollow and a second pattern plate formed in the hollow of the first pattern plate, wherein a band-shaped line pattern formed by a separation interval is formed between the first pattern plate and the second pattern plate, thereby forming a capacitance component; and

a variable capacitor is coupled between the first pattern plate and the second pattern plate and a center of the second pattern plate is connected to the lower plate via a via-pin thereby forming a grounding.

3. The reflection frequency conversion device as claimed in claim 2, wherein at least one variable capacitor is coupled between the first pattern plate and the second pattern plate,

wherein in a polygonal metamaterial unit structure, one variable capacitor is disposed on each side thereof.

4. The reflection frequency conversion device as claimed in claim 3, wherein the variable capacitor has a varactor diode.

5. The reflection frequency conversion device as claimed in claim 2, wherein one end of the arbitrary waveform generator is coupled to the first pattern plate of the upper plate and the other end thereof is coupled to the lower plate.

6. The reflection frequency conversion device as claimed in claim 1, wherein the arbitrary waveform generator generates and provides a voltage waveform so as to change a bias voltage of a variable capacitor corresponding to a desired resonant frequency.

7. The reflection frequency conversion device as claimed in claim 6, wherein the arbitrary waveform generator generates a voltage waveform applied to the variable capacitor so as to linearly change a reflected wave phase to 360°

on the metamaterial surface.

8. The reflection frequency conversion device as claimed in claim 1, wherein metamaterial unit cells including a plurality of metamaterial unit structures are periodically disposed, respectively, and in the metamaterial unit cell, the metamaterial unit structures including one or more metamaterial unit structures configured with the same structure are configured in a form having a predetermined pattern or various sizes of metamaterial unit structures with the same structure is configured to have a predetermined pattern.

9. The reflection frequency conversion device as claimed in claim 1, wherein metamaterial unit cells including a plurality of metamaterial unit structures are periodically disposed, respectively, and the metamaterial unit cell includes two or more metamaterial unit structures having shapes different from each other of polygonal or circular metamaterial unit structures to have a predetermined pattern.

10. An ECM system, an equipment surface of which includes a plate-shaped active metamaterial surface configured to continuously convert a phase of a reflected wave by changing surface impedance characteristics in accordance with input voltage provided from an arbitrary waveform generator, and which includes an arbitrary waveform generator providing a voltage waveform changed in accordance with time to the metamaterial surface therein,

wherein a plurality of metamaterial unit structures are periodically disposed on the metamaterial surface, and the metamaterial unit structure is a high impedance surface (HIS) provided with a variable capacitor, to change the capacitance of the variable capacitor in accordance with applied voltage.

11. The ECM system as claimed in claim 10, wherein a radio communication means is additionally provided in the equipment and a voltage waveform output through the arbitrary waveform generator is changed and set on the basis of signals input by wireless.

12. The ECM system as claimed in claim 10, wherein in the metamaterial unit structure, a dielectric plate with a predetermined thickness is disposed between a conductive lower plate and upper plate;

the upper plate comprises a band-type first pattern plate with a hollow and a second pattern plate formed in the hollow of the first pattern plate, wherein a band-shaped line pattern formed by a separation interval is formed between the first pattern plate and the second pattern plate, thereby forming a capacitance component; and

a variable capacitor is coupled between the first pattern plate and the second pattern plate and a center of the second pattern plate is connected to the lower plate via a via-pin thereby forming a grounding.

13. The ECM system as claimed in claim 12, wherein at least one variable capacitor is coupled between the first pattern plate and the second pattern plate,

wherein in a polygonal metamaterial unit structure, one variable capacitor is disposed on each side thereof.

14. The ECM system as claimed in claim 12, wherein one end of the arbitrary waveform generator is coupled to the first pattern plate of the upper plate and the other end thereof is coupled to the lower plate.

15. The ECM system as claimed in claim 12, wherein the arbitrary waveform generator generates and provides a voltage waveform so as to change a bias voltage of a variable capacitor corresponding to a desired resonant frequency.

16. The ECM system as claimed in claim 12, wherein the arbitrary waveform generator generates a voltage waveform applied to the variable capacitor so as to linearly change a reflected wave phase to 360°

on the metamaterial surface.

17. The ECM system as claimed in claim 10, wherein metamaterial unit cells including a plurality of metamaterial unit structures are periodically disposed, respectively, and in the metamaterial unit cell, the metamaterial unit structures including one or more metamaterial unit structures configured with the same structure are configured in a form having a predetermined pattern or various sizes of metamaterial unit structures with the same structure is configured to have a predetermined pattern.

18. The ECM system as claimed in claim 10, wherein metamaterial unit cells including a plurality of metamaterial unit structures are periodically disposed, respectively, and the metamaterial unit cell includes two or more metamaterial unit structures having shapes different from each other of polygonal or circular metamaterial unit structures to have a predetermined pattern.