Filter utilizing a frequency selective non-conductive dielectric structure
First Claim
1. A filter comprising:
- a first non-conductive dielectric material for receiving electromagnetic energy; and
a spatially periodic dielectric lattice structure comprised of a plurality of elongated elements of a second non-conductive dielectric material, the elongated elements extending in parallel to each other along parallel longitudinal axes of the elongated elements and being disposed with respect to a plane orthogonal to the longitudinal axes of the elongated elements in a two-dimensional periodic lattice arrangement within the first non-conductive dielectric material, the lattice structure having dimensions which are proportioned such that the structure defines a band gap at a range of electromagnetic energy frequencies such that electromagnetic energy at such frequencies having a polarization parallel to the longitudinal axis of the elongated elements and electromagnetic energy at such frequencies having a polarization perpendicular to the longitudinal axis of the elongated elements is substantially prevented from propagating within the spatially periodic dielectric lattice structure.
6 Assignments
0 Petitions
Accused Products
Abstract
A filter utilizes a frequency selective, non-conductive, dielectric structure for filtering electromagnetic energy in the millimeter to far infrared frequency bands. The filter includes a non-conductive, high-dielectric, background material positioned to receive incident electromagnetic energy. A lattice structure comprised of a plurality of elongated elements formed of a non-conductive, high-dielectric material are disposed in a two-dimensional, periodic arrangement in the background material. The elements extend in parallel to one another through the background material for providing a range of frequencies over a band gap in which incident electromagnetic energy within the frequency range of the band gap is substantially prevented from propagating through the lattice structure. The dielectric structure can be adapted to operate as a band stop filter or a low pass filter.
62 Citations
39 Claims
-
1. A filter comprising:
-
a first non-conductive dielectric material for receiving electromagnetic energy; and a spatially periodic dielectric lattice structure comprised of a plurality of elongated elements of a second non-conductive dielectric material, the elongated elements extending in parallel to each other along parallel longitudinal axes of the elongated elements and being disposed with respect to a plane orthogonal to the longitudinal axes of the elongated elements in a two-dimensional periodic lattice arrangement within the first non-conductive dielectric material, the lattice structure having dimensions which are proportioned such that the structure defines a band gap at a range of electromagnetic energy frequencies such that electromagnetic energy at such frequencies having a polarization parallel to the longitudinal axis of the elongated elements and electromagnetic energy at such frequencies having a polarization perpendicular to the longitudinal axis of the elongated elements is substantially prevented from propagating within the spatially periodic dielectric lattice structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A band stop filter comprising:
-
a non-conductive high-dielectric-constant material for receiving electromagnetic energy; and a spatially periodic dielectric lattice structure comprised of a plurality of elongated elements of a non-conductive low-dielectric-constant material, the elongated elements extending in parallel to each other along parallel longitudinal axes of the elongated elements through the non-conductive high-dielectric-constant material and being disposed with respect to a plane orthogonal to the longitudinal axes of the elongated elements in a two-dimensional period lattice arrangement within the non-conductive high-dielectric-constant material and extending through the non-conductive high-dielectric-constant material in a direction transverse to a direction of propagation of the electromagnetic energy, the lattice structure having dimensions which are proportioned such that the lattice structure defines a stop band at a range of electromagnetic energy frequencies such that electromagnetic energy at such frequencies having a polarization parallel to the longitudinal axis of the elongated elements and electromagnetic energy at such frequencies having a polarization perpendicular to the longitudinal axis of the elongated elements is substantially prevented from propagating within the spatially periodic dielectric lattice structure. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
-
-
23. A tunable filter comprising:
-
a first non-conductive dielectric material for receiving electromagnetic energy; a spatially periodic dielectric lattice structure comprised of a plurality of elongated elements of a second non-conductive dielectric material, the elongated elements extending in parallel to each other along parallel longitudinal axes of the elongated elements and being disposed with respect to a plane orthogonal to the longitudinal axes of the elongated elements in a two-dimensional periodic lattice arrangement within the first non-conductive dielectric material, the lattice structure having dimensions which are proportioned such that the lattice structure defines a band gap at a range of electromagnetic energy frequencies such that electromagnetic energy at such frequencies having a polarization parallel to the longitudinal axis of the elongated elements and electromagnetic energy at such frequencies having a polarization perpendicular to the longitudinal axis of the elongated elements is substantially prevented from propagating within the spatially periodic dielectric lattice structure; and a signal source coupled across the first non-conductive dielectric material for providing an external field across the first non-conductive dielectric material, the external field changing a characteristic of the first non-conductive dielectric material to tune the frequency range of the band gap. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
-
-
37. An electromagnetic energy filter comprising:
-
A body of non-conductive dielectric material; and a spatially periodic dielectric lattice structure in said body and comprised of a plurality of elongated non-conductive dielectric elements disposed with respect to a plane orthogonal to a longitudinal axis of the elongated elements in a two-dimensional periodic lattice arrangement within the body and extending in parallel with one another through the body, the lattice structure having dimensions which are proportioned such that the lattice structure defines a band gap at a range of electromagnetic energy frequencies such that electromagnetic energy at such frequencies having a polarization parallel to the longitudinal axis of the elongated elements and electromagnetic energy at such frequencies having a polarization perpendicular to the longitudinal axis of the elongated elements which is incident on the body of non-conductive dielectric material is substantially prevented from propagating within the body of non-conductive dielectric material. - View Dependent Claims (38, 39)
-
Specification