Ultra-wideband photonic band gap crystal having selectable and controllable bad gaps and methods for achieving photonic band gaps
October 30, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesElectronically steered antenna system using a reflective surface formed of piezoelectric transducers Antenna scanned by frequency variation Highly efficient planar antenna on a periodic dielectric structure Filter utilizing a frequency selective non-conductive dielectric structure Folded multiple bandpass filter with various couplings Low-loss dielectric resonant devices having lattice structures with elongated resonant defects Efficient broadband antenna system using photonic bandgap crystals Dielectric filter having a non-conductive region in each resonator hole Patent #: 5546059 InventorsAssigneeApplicationNo. 550040 filed on 10/30/1995US Classes:343/895, Spiral or helical type333/202, Wave filters including long line elements343/785, Dielectric type (e.g., polystyrene rod)343/787, Including magnetic material343/909Refracting means and radio wave energy filters (e.g., lenses and polarizers)ExaminersPrimary: Hajec, Donald T.Assistant: Ho, Tan Attorney, Agent or FirmInternational ClassH01Q 001/36AbstractThe present invention provides multidimensional stacked photonic band gap crystal structures improving the performance of current planar monolithic antennas and RF filters by forbidding radiation from coupling into the substrate thereby significantly enhancing radiation efficiency and bandwidth. This invention comprises a number of sub-crystals with each having at least two lattices disposed within a host material, each lattice having a plurality of dielectric pieces arranged and spaced from each other in a predetermined manner, the sub-crystals being stacked in a crystal structure to provide a photonic band gap forbidding electromagnetic radiation propagating over a specially designed frequency band gap, or stopband. Both two dimensional and multidimensional crystals are disclosed. The preferred embodiment is a three-dimensional photonic band gap crystal comprising two or more sub-crystals, with each sub-crystal having a diamond-patterned lattice constructed from a plurality of dielectric zigzag pieces orthogonally interconnected, disposed within a host material.Other References
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