Method and apparatus for multiband frequency distributed circuit with FSS

• US 7,250,921 B1
• Filed: 12/18/2003
• Issued: 07/31/2007
• Est. Priority Date: 12/18/2003
• Status: Expired due to Fees

• Current Assignee: Navy Secretary of The United of America Office of Naval Research
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Ho, Thinh Q., Henry, Willard I.
• Primary Examiner(s): Vo; Tuyet
• Assistant Examiner(s): Dieu; Minh A
• Application Number:
  US10/740,297
• Time in Patent Office: 1,321 Days
• Field of Search: 343/700.MS, 343/756, 343/909, 343/795, 343/754, 343/911.R
• US Class Current: 343/909
• CPC Class Codes: H01P 1/203 Strip line filters
• CPC Class Codes: H01P 3/08 Microstrips; Strip lines
• CPC Class Codes: H01P 5/02 with invariable factor of coupling H01P5/12 takes precedence choke joints H01P1/04, H01P1/06
• CPC Class Codes: H01Q 15/0013 said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
• CPC Class Codes: H01Q 15/0026 said selective devices having a stacked geometry or having multiple layers

Abstract

A method and apparatus for a multiband frequency distributed circuit apparatus with FSS. The apparatus includes a circuit, a first dielectric layer, a first FSS layer, a second layer and a ground plane. The first dielectric layer is operatively coupled to the circuit. The first FSS layer is operatively coupled to the first dielectric layer and is capable of passing a first frequency band. The second layer is operatively coupled to the first FSS layer and includes a dielectric material. The ground plane is operatively coupled to the second layer. A method for implementing a multiband frequency distributed circuit is also disclosed.

Claims

1. A multiband frequency distributed circuit apparatus with FSS, comprising:

a) a circuit including a top surface and a bottom surface;

b) a first dielectric layer, operatively coupled to said circuit;

c) a first FSS layer, operatively coupled to said first dielectric layer, capable of passing a first frequency band;

d) a second layer, operatively coupled to said first FSS layer, wherein said second layer comprises a dielectric material;

e) a ground plane, operatively coupled to said second layer.

2. The multiband frequency distributed circuit apparatus with FSS of claim 1, wherein said first dielectric layer is operatively coupled to said bottom surface.

3. The multiband frequency distributed circuit apparatus with FSS of claim 1, wherein said second layer comprises at least one additional FSS layer.

4. The multiband frequency distributed circuit apparatus with FSS of claim 1, wherein said second layer comprises a second dielectric layer and a second FSS layer and a third dielectric layer, and wherein said second dielectric layer is operatively coupled to said first FSS layer, and wherein said second FSS layer is operatively coupled to said second dielectric layer, and wherein said second FSS layer is operatively coupled to said third dielectric layer and wherein said third dielectric layer is operatively coupled to said ground plane.

5. The multiband frequency distributed circuit apparatus with FSS of claim 1, wherein said second layer comprises at least two additional dielectric layers and at least one additional FSS layer.

6. The multiband frequency distributed circuit apparatus with FSS of claim 1, wherein said multiband frequency distributed circuit apparatus has a total length greater than

$\frac{\lambda }{}$

2

and a total width greater than 2λ

.

7. The multiband frequency distributed circuit apparatus with FSS of claim 1, wherein said multiband frequency distributed circuit apparatus is a microstrip apparatus.

8. The multiband frequency distributed circuit apparatus with FSS of claim 7, wherein said multiband frequency distributed circuit apparatus has a total height of FSS and dielectric layers represented by the following equation:

$H=\sum <br><br>h_i+\sum <br><br>t_i⪡<br><br>\frac{\mathrm{\lambda <br><br>}}{4}.$

9. The multiband frequency distributed circuit apparatus with FSS of claim 1, wherein said multiband frequency distributed circuit apparatus is a stripline apparatus.

10. The multiband frequency distributed circuit apparatus with FSS of claim 1, wherein said first dielectric layer comprises a top first dielectric layer and a bottom first dielectric layer, and wherein said bottom first dielectric layer is operatively coupled to said bottom surface of said circuit, and wherein said top first dielectric layer is operatively coupled to said top surface of said circuit.

11. The multiband frequency distributed circuit apparatus with FSS of claim 10, wherein said first FSS layer comprises a top first FSS layer and a bottom first FSS layer, and wherein said top first FSS layer is operatively coupled to said top first dielectric layer, and wherein said bottom first FSS layer is operatively coupled to said bottom first dielectric layer.

12. The multiband frequency distributed circuit apparatus with FSS of claim 11, wherein said second layer comprises a top second layer and a bottom second layer, and wherein said top second layer is operatively coupled to said top first FSS layer, and wherein said bottom second layer is operatively coupled to said bottom first FSS layer.

13. The multiband frequency distributed circuit apparatus with FSS of claim 12, wherein said top second layer comprises at least two additional dielectric layers and at least one additional FSS layer, and wherein said bottom second layer comprises at least two additional dielectric layers and at least one additional FSS layer.

14. The multiband frequency distributed circuit apparatus with FSS of claim 12, wherein said ground plane comprises a top ground plane and a bottom ground plane, and wherein said top ground plane is operatively coupled to said top second layer, and wherein said bottom ground plane is operatively coupled to said bottom second layer.

15. A method for a multiband frequency distributed circuit with FSS, the method comprising the steps of:

a) coupling a circuit on a first dielectric layer, wherein said circuit includes a top surface and a bottom surface;

b) coupling a first FSS layer on said first dielectric layer;

c) coupling a second layer on said first FSS layer, wherein said second layer comprises at least one dielectric layer;

d) coupling a ground plane to said second layer.

16. The method of claim 15, wherein said multiband frequency distributed circuit with FSS is a microstrip circuit.

17. The method of claim 15, wherein said multiband frequency distributed circuit with FSS is a stripline circuit.

18. The method of claim 15, wherein said coupling a circuit on said first dielectric layer step comprises coupling said bottom surface of said circuit on said first dielectric layer.

19. The method of claim 15, wherein said coupling said ground plane to said second layer step comprises the following sub-steps:

i) coupling an additional FSS layer to said second layer;

ii) coupling an additional dielectric layer to said additional FSS layer;

iii) repeating sub-steps (i) and (ii) until a desired dielectric layer is coupled;

iv) coupling said ground plane to said desired dielectric layer.

20. The method of claim 15, wherein said coupling said circuit on said first dielectric layer step comprises coupling said circuit between a top first dielectric layer and a bottom first dielectric layer.

21. The method of claim 20, wherein said coupling said first FSS layer on said first dielectric layer step comprises the following sub-steps:

i) coupling a top first FSS layer to said top first dielectric layer;

ii) coupling a bottom first FSS layer to said bottom first dielectric layer.

22. The method of claim 21, wherein said coupling said second layer on said first FSS layer step comprises the following sub-steps:

i) coupling a top second dielectric layer to said top first FSS layer;

ii) coupling a bottom second dielectric layer to said bottom first FSS layer.

23. The method of claim 22, wherein said coupling said ground plane on said second layer step comprises the following sub-steps:

i) coupling a top ground plane to said top second layer;

ii) coupling a bottom ground plane to said bottom second layer.

24. A multiband frequency distributed circuit apparatus, comprising:

a) means for coupling a circuit on a first dielectric layer, wherein said circuit includes a top surface and a bottom surface;

b) means for coupling a first FSS layer on said first dielectric layer;

c) means for coupling a second layer on said first FSS layer, wherein said second layer comprises at least one dielectric layer;

d) means for coupling a ground plane to said second layer.