Back to results
US 2003/0151033 A1Published application
Dielectric media
AssigneeQinetiq Limited
InventorsTerence J. Shepherd, Paul R. Tapster
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeQinetiq Limited
InventorsTerence J. Shepherd, Paul R. Tapster
Estimating the term…
A novel method of fabrication of periodic dielectric composites involving a flexible computer design stage, rapid growth of a second dielectric component. Laser stereolithography is used to form the polymer material layer by layer by photopolymerisation of a liquid. Certain materials constructed in this fashion exhibit a complete loss-free barrier to microwave propagation through the material for a desired band of frequencies and are commonly known as photonic band gap crystals. Such materials could provide a novel medium for all-angle wide- and narrow-band blocking filters, narrow-band transmission filters, reflective and loss-free substrates for planar antennas, and novel loss-free media for oscillator cavities and waveguides. In addition a novel crystal structure, particularly suited to the fabrication method mentioned above and consisting of concatenated polyhedrons, is revealed.
A method of manufacturing a dielectric medium having a periodic spatial distribution of two materials, said materials being so formed that discrete interfaces exist between them, said materials having sufficiently different electrical permittivities that the dielectric medium provides a barrier to electromagnetic radiation for a range of frequencies, comprising the steps of
A dielectric medium having a periodic spatial distribution of a low permittivity material and of a high permittivity material, said materials being so formed that discrete interfaces exist between them, said materials having sufficiently different electrical permittivities that the dielectric medium provides a barrier to electromagnetic radiation for a range of frequencies, the structure of the high permittivity material being in the form of concatenated polyhedrons.
A dielectric medium having a periodic spatial distribution of a low permittivity material and a high permittivity material, said materials being so formed that discrete interfaces exist between them, said materials having sufficiently different electrical permittivities that the dielectric medium provides a barrier to electromagnetic radiation for a range of frequencies, the low permittivity material comprising a polymer formed by photopolymerisation.
Dependencies are inferred from the claim text.