LOW-PROFILE FREQUENCY SELECTIVE SURFACE BASED DEVICE AND METHODS OF MAKING THE SAME

• US 20090273527A1
• Filed: 05/05/2008
• Published: 11/05/2009
• Est. Priority Date: 05/05/2008
• Status: Active Grant

• Current Assignee: University of Central Florida Research Foundation Inc. (State University System of Florida)
• Original Assignee: University of Central Florida Research Foundation Inc. (State University System of Florida)
• Inventors: Behdad, Nader
• Granted Patent: US 7,639,206 B2
• Time in Patent Office: Days
• US Class Current: 343/705
• CPC Class Codes: H01Q 1/286 substantially flush mounted with the skin of the craft
• CPC Class Codes: H01Q 1/34 Adaptation for use in or on ships, submarines, buoys or torpedoes for subaqueous use H01Q1/04
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 13/16 Folded slot antennas
• CPC Class Codes: H01Q 15/0026 said selective devices having a stacked geometry or having multiple layers
• CPC Class Codes: H01Q 15/006 Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
• CPC Class Codes: H01Q 21/064 using horn or slot aerials slotted waveguides arrays H01Q21/005
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001

Abstract

A frequency selective surface-based (FSS-based) device (200) for processing electromagnetic waves providing at least a third-order response. The FSS-based device includes a first FSS (202), a second FSS (210), and a high quality factor (Q) FSS (206) interposed between the first and second FSSs. A first dielectric layer (204) and a second dielectric layer (208) separate the respective FSS layers. The first and second FSSs have first and second primary resonant frequencies, respectively. The high Q FSS has a lower primary resonant frequency relative to the first and second primary resonant frequencies. The overall electrical thickness of the PSS device can be <λ/10. The high Q FSS has a loaded quality factor of at least thirty at the lower primary resonant frequency.

Claims

1. A frequency selective surface-based (FSS-based) device for processing electromagnetic waves, comprising:

a first and second frequency selective surface (FSS) having first and second primary resonant frequencies, respectively;

a high quality factor (Q) FSS having a lower primary resonant frequency relative to said first and second primary resonant frequencies, said high Q FSS interposed between said first and second FSS and having a loaded Q of at least thirty at said lower primary resonant frequency;

a first dielectric layer interposed between said first FSS and said high Q FSS; and

a second dielectric layer interposed between said second FSS and said high Q FSS.

2. The FSS-based device according to claim 1, wherein said high Q FSS comprises a plurality of dielectric comprising features formed in an electrically conductive layer.

3. The FSS-based device according to claim 2, wherein said high Q FSS comprises a plurality of slot antennas.

4. The FSS-based device according to claim 3, wherein said slot antennas comprise a straight slot having a set of balanced spirals disposed at each end of said straight slot.

5. The FSS-based device according to claim 3, wherein said slot antenna comprises a dual-polarized crossed slot antenna.

6. The FSS-based device according to claim 1, wherein a thickness of said FSS-based device is <

λ

/10, where λ

is a wavelength of operation of said FSS-based device.

7. The FSS-based device according to claim 1, further comprising a plurality of FSS-based devices stacked together by sharing at least one common layer selected from said first and second FSS.

8. The FSS-based device according to claim 1, wherein said first and second primary resonant frequencies are each at least 1.3 times larger than said lower primary resonant frequency.

9. The FSS-based device according to claim 1, wherein said first and second primary resonant frequencies are each at least three times larger than said lower primary resonant frequency.

10. A system, comprising:

a propelled object or vehicle; and

a frequency selective surface based (FSS-based) device coupled to said propelled object or vehicle, said FSS-based device configured for processing electromagnetic waves and comprising

a substrate having a surface layer; and

a multi-layer frequency selective surface (FSS) structure disposed on said surface layer, said multi-layer FSS structure comprising a first FSS having a first primary resonant frequency, a second FSS having a second primary resonant frequency, a high quality factor (Q) FSS interposed between said first FSS and said second FSS, a first dielectric layer interposed between said first FSS and said high Q FSS, and a second dielectric layer interposed between said second FSS and said high Q FSS;

wherein said high Q FSS has a lower primary resonant frequency relative to said first and second primary resonant frequencies and a loaded Q of at least thirty at said lower primary resonant frequency.

11. The system according to claim 10, wherein said high Q FSS comprises a plurality of dialectic comprising features formed in an electrically conductive layer.

12. The system according to claim 11, wherein said high Q FSS comprises a plurality of slot antennas.

13. The system according to claim 12, wherein said slot antennas comprise a straight slot having a set of balanced spirals disposed at each end of said straight slot.

14. The system according to claim 12, wherein said slot antenna comprises a dual-polarized crossed slot antenna.

15. The system according to claim 10, wherein a thickness of said multi-layer FSS structure is <

λ

/10, where λ

is a wavelength of operation of said FSS-based device.

16. The system according to claim 10, wherein said multi-layer FSS structure comprises a plurality of FSS-based devices stacked together by sharing at least one common layer selected from said first and second FSSs.

17. The system according to claim 10, wherein said first and second primary resonant frequencies are each at least 1.3 times larger than said lower primary resonant frequency.

18. The system according to claim 10, wherein each of said first and second primary resonant frequencies are each at least three times larger than said lower primary resonant frequency.

19. The system according to claim 10, wherein said propelled object or vehicle is an aircraft, a missile, or a ship.