A thermosyphon radiator comprising a sealed panel is formed into two or more discrete chambers, each containing a reservoir of vaporising liquid in a lowermost part of the panel and a heating member extending with clearance through the lowermost part of the panel, the member being at least partially immersed in the vaporising liquid.

A heat-exchange radiator (1) is connected to a fluid flow circuit by a connector (19) which provides one member (21) of an interengageable spigot and socket pair (21 and 25) for push-fit, fluid-tight, engagement between the connector and the radiator, with latching formations (22 and 27) at least one of which is resilient. Preferably the connector carries the spigot which tapers and engages with a socket of corresponding shape, the spigot carrying an O-ring seal (23) and either latching fingers ...

A thermosyphon radiator comprising a sealed panel containing a reservoir of water in a lowermost part of the panel and a heating member, e.g. a hot water pipe, extending through the lowermost part of the panel, the member being at least partially immersed in the liquid.

A polymeric radiator having front and back radiator halves, that cooperate to define a primary coolant passage and a series of secondary coolant passages. The primary coolant passage includes integral internal baffles extending inwardly from the radiator halves. The internal baffles define passageways to allow coolant to flow through the radiator. Preferably, the passageways do not intersect the mating edges of the front and back radiator halves to enhance the structural integrity of the radiato...

A microwave radiator assembly comprising an oven cavity, an antenna chamber communicating with the oven cavity by radiation openings and an antenna structure energized by a microwave generator. The introduction of radiation into the oven cavity is effected by an arrangement comprising a metallic plate in which said radiation openings are carried out and a coupling pin mounted in a microwave-transparent plate projecting through each opening forming coaxial paths into the oven chamber.

A method of forming a electromagnetic radiator having cavities of predetermined dimensions involving coating a plurality of wires with an electromagnetic radiator material at predetermined thicknesses, the wires being soluble in a solvent and the radiator material being insoluble in the solvent, forming a bundle of a multiplicity of the coated wires, the coatings on the wires engaging each other, reducing the diameter of the bundle to a smaller predetermined diameter and fusing the coatings toge...

In combination with a vehicle hood and windshield, an engine compartment, an engine in the compartment, and a heat radiator located to pass cooling air flowing toward the engine, the radiator having an air inlet side, that combination comprising a cooling air receiving plenum chamber located at the air inlet side of the radiator; air inlet ducting having an entrance proximate the windshield to receive air flowing over the vehicle hood; and at least one passage communicating with the air inlet du...

A limiting feature in spacecraft such as communication satellites is becoming the amount of surface such as 5, 6 available for dissipating waste heat from the electrical equipment in the satellite. The invention provides a deployable radiator 11 which carries a number of capillary pumped loops consisting of an evaporator, an outward limb and a return limb. The panel 11 is rolled up to coil the elements prior to launch, and unrolled when in orbit. The outward and return lengths of tube act as con...

An antenna can efficiently radiate at both the lower cell phone frequency band of about 850 MHz and the higher cell phone frequency band of about 1920 MHz that are in current use. The antenna includes a vertical conductor with an upper portion (32) of a length that is about 1/2 wavelength at the lower frequency to effectively radiate at that frequency. An upper PRD (phase reversal device) (40) located along the upper conductor portion divides it into top and bottom parts (60, 70) each of about 1...

The invention concerns a space craft, such as a telecommunication geostationary satellite, comprising a body, at least one main telecommunication antenna having a specific orientation relative to the body, at least a omnidirectional antenna having a field of view opposite to that of the main antennae and at least a radiator extensible by tilting about an axis linked to the craft body between a stowing position wherein it is pressed against the body and an extended position. The axis is positione...