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1. WO1998015858 - DIELECTRIC COMPOSITES

Publication Number WO/1998/015858
Publication Date 16.04.1998
International Application No. PCT/GB1997/002723
International Filing Date 06.10.1997
Chapter 2 Demand Filed 02.05.1998
IPC
B29C 39/10 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
39Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
02for making articles of definite length, i.e. discrete articles
10incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
B29C 67/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
67Shaping techniques not covered by groups B29C39/-B29C65/93
B29C 69/02 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
69Combinations of shaping techniques not provided for in a single one of main groups B29C39/-B29C67/135; Apparatus therefor
02of moulding techniques only
G02B 6/12 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
10of the optical waveguide type
12of the integrated circuit kind
G02B 6/122 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
10of the optical waveguide type
12of the integrated circuit kind
122Basic optical elements, e.g. light-guiding paths
CPC
B29C 2791/001
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
2791Shaping characteristics in general
001Shaping in several steps
B29C 39/10
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
39Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
02for making articles of definite length, i.e. discrete articles
10incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
B29C 64/165
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
64Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
10Processes of additive manufacturing
165using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber
B29C 64/40
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
64Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
40Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof
B29C 69/02
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
69Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
02of moulding techniques only
B29K 2995/0006
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR ; MOULDS, ; REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
2995Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
0003having particular electrical or magnetic properties, e.g. piezoelectric
0006Dielectric
Applicants
  • THE SECRETARY OF STATE FOR DEFENCE [GB]/[GB] (AllExceptUS)
  • SHEPHERD, Terence, John [GB]/[GB] (UsOnly)
  • TAPSTER, Paul, Richard [GB]/[GB] (UsOnly)
Inventors
  • SHEPHERD, Terence, John
  • TAPSTER, Paul, Richard
Agents
  • SKELTON, Stephen, Richard
Priority Data
9621049.709.10.1996GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DIELECTRIC COMPOSITES
(FR) COMPOSITES DIELECTRIQUES
Abstract
(EN)
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.
(FR)
Nouveau procédé de fabrication de composites diélectriques périodiques comprenant une phase de conception informatisée souple et la croissance rapide d'un deuxième composant diélectrique. On utilise la stéréolithographie laser pour former la matière polymère couche par couche par photopolymérisation d'un liquide. Certaines matières fabriquées de cette manière se comportent comme une barrière sans aucune perte à la propagagtion des ondes hyperfréquence à travers la matière pour une bande désirée de fréquences et sont habituellement connues sous le nom de cristaux à largeur de bande interdite photonique. Ces matières pourraient constituer un nouveau support pour tous les filtres d'arrêt à grand angle et à bande étroite, les filtres de transmission à bande étroite, les substrats réfléchissants et sans perte pour les antennes planes et de nouveaux supports sans perte pour les cavités d'oscillateurs et les guides d'ondes. Cette invention concerne également une nouvelle structure de cristal particulièrement adaptée au procédé de fabrication présenté ci-avant et constitué de polyhèdres concaténés.
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