U.S. Philips Corporation

Koninklijke Philips Corporation N.V.

Wilhelm Georg Hermann

Horst Horster

Mareike K Klee

Olaf Wunnicke

Robert Frederick Milsom

Rolf Clasen

Rainer Kiewitt

Uwe Mackens

Hans Peter L&ouml;bl

Martinus Hermanus Wilhemus Maria Van Delden

Johann Schroder

Gijsbertus A Spierings

Klaus Klinkenberg

Faramarz Mahdjuri

Wolfgang Brand

Hendrikus J Van Haren

Hans Jungk

Mathieu J Ulenaers

The invention describes a tunable filter arrangement with at least two resonators which are coupled to one another and of which at least one is connected to a capacitor with tunable capacitance. The electrical properties of the resonator, and thus the overall filter characteristic, can be changed through a change in the capacitance of the capacitor. Furthermore, a transmitter, a receiver, a mobile telephone device, and a wireless data transmission system comprising such a filter arrangement are disclosed, as is a tunable bulk acoustic wave resonator.

Tunable piezoelectric filter arrangement using a dielectric material with a voltage-dependent dielectric constant

The invention describes a tunable filter arrangement with a plurality of resonators which are coupled to one another and of which there is at least one which comprises a piezoelectric component made of a ferroelectric material and to which a DC voltage source is connected. The application of a DC voltage to the resonator renders it possible to change its electrical properties and thus the overall filter characteristic. Furthermore, a transmitter, a receiver device, and a mobile telephone device with such a filter arrangement are disclosed, aswell as a tunable bulk acoustic wave resonator.

Tunable filter arrangement comprising resonators with reflection layers

A component includes a substrate layer (1) of glass or Al.sub.2 O.sub.3, an anti-reaction layer (2) or a levelling layer (2), two electrode layers (3, 5) and a dielectric layer (4) as well as such a capacitor. Manufacture a component which provides for cost-effective, surface-mountable (SMD). The anti-reaction layer (2) on the glass substrate (1) or the levelling layer (2) on the Al.sub.2 O.sub.3 -substrate (1) is made of at least one specific material. An anti-reaction layer or a levelling layer (2) of one of the above-mentioned substances or a combination of several substances, enables a dielectric layer (4) to be provided by means of which a high capacitance value is achieved.

Component comprising a capacitor

A method of manufacturing a flat, glass-like or ceramic moulding having a structured surface, in which a rotationally symmetrical, moist green body is manufactured from a suspension of a highly dispersed, powdered solid material and a dispersing agent by centrifuging in a hollow mould, whereafter said green body is removed from the hollow mould and, if necessary, rolled out subsequently, cut up and, after which it is spread out on a structure-imparting substrate, the surface is embossed by applying pressure and, subsequently, the glass-like or ceramic moulding is produced by drying and sintering.

Method of manufacturing structured mouldings

A method of and arrangements for manufacturing glass bodies, in which the starting material for the glass body, being an anhydrous suspension having a microdispersed solids content, is used to form a porous green body which is subsequently purified and sintered, in which by separating the phases of an anhydrous suspension the green body is formed by means of electrophoresis on a deposition electrode whose shape corresponds to that of the glass body to be produced.

Method for manufacturing glass bodies

A method of and arrangements for manufacturing glass bodies, in which the starting material for the glass body, being a suspension having a microdispersed solids content, is used to form a porous green body which is subsequently purified and sintered, in which, by separating the phases of the suspension in an arrangement in which a pressure difference can be built up, the green body is deposited on a porous membrane whose shape corresponds to that of the glass body to be produced, the pores of the membrane having a diameter in the range from 1 to 500 times the average particle diameter of the solids content of the suspension.

A solar collector for heating a gaseous heat transport medium comprises an open-top housing provided with a transparent cover layer formed of a plurality of adjacently arranged, substantially mutually contacting, sealed and evacuated transparent cover tubes. The inner surface of each cover tube is provided with a selective absorption layer over the half facing the interior of the housing. The surface of the housing bottom facing the cover tubes has a vaulted profile corresponding to the shape of the cover tubes. An inlet and an outlet are respectively provided in the opposite sidewalls of the housing for flow of the gaseous heat transport medium transversely of the cover tubes in direct thermal contact herewith.

Solar collector for heating a gaseous heat transport medium

A wall element, comprising a solar collector which is arranged between two panes and which comprises a number of rotatable absorber plates. One side of the absorber plates is provided with a non-selective black coating and the other side is provided with a selective, heat-reflective layer. The absorber plates are accommodated in evacuated, transparent tubes.

Wall element comprising a solar collector which is disposed between two

A solar collector including at least one evacuated transparent cover tube provided with means for supplying hydrogen to and extracting hydrogen from the cover tube.

Solar collector comprising an evacuated cover

A solar collector comprising an absorber and a heat-insulating transparent cover which consists of a number of sealed and evacuated glass tubes adjacently arranged in contact with each other, at least the lower half of the inner surface of each glass tube being provided with an infrared-reflecting layer.

Solar collector

A thermal insulating glazing unit comprising a plurality of elongated evacuated sealed glass tubes arranged adjacent each other with their axes parallel, transverse to the light. The inner side of each of the glass tubes is covered by an infrared-reflecting coating.

Growing community of inventors

Roetgen, Germany

Wilhelm Georg Hermann