Abstract:
A fixture attached to the rear of the base plate of a semi-automatic screen printer includes an element holder having a vertical recess or pocket for receiving an assembly, such as a substrate, of LTCC laminate material lengthwise therein so as to expose only one side surface to the printing head which would otherwise be prevented because of the height restrictions imposed by the printer head.
Abstract:
Slots or apertures are formed in the connector shroud of a T/R module in a plane perpendicular to the axis of the connector so as to allow plating solution to flow freely through the entire inner portion of the connector, particularly the rear portion, during fabrication of the T/R module. The slots are formed prior to the shroud being brazed on to the module substrate. By allowing plating solution to flow through the connector, the interior of the connector can be more thoroughly plated, thereby improving the yield of the assembly while reducing cost.
Abstract:
A ceramic composition for forming ceramic dielectric body having a dielectric constant of less than about 5.5 and a TCE of less than about 5.0 ppm/.degree.C. The composition comprises a mixture of finely divided particles of 10-90 vol. % borosilicate glass and 10-90 vol. % of a material selected from the group consisting of Ga.sub.2 O.sub.3, Ga.sub.2 SiO.sub.5, Ga.sub.2 TiO.sub.5, GaAs, GaPO.sub.4 and any gallium-contained compounds to inhibit the formation of crystalline forms of silica. The composition can be used with a polymeric binder to produce an unfired green tape which is co-fireable with high conductivity metallurgies such as gold, silver and silver/palladium.
Abstract translation:一种用于形成介电常数小于约5.5且TCE小于约5.0ppm /℃的陶瓷介电体的陶瓷组合物。该组合物包含10-90体积%的细碎颗粒的混合物。 %硼硅酸盐玻璃和10-90体积% %的选自Ga 2 O 3,Ga 2 SiO 5,Ga 2 TiO 5,GaAs,GaPO 4的材料和任何含镓化合物,以抑制二氧化硅结晶形式的形成。 该组合物可以与聚合物粘合剂一起使用以产生与高电导率冶金如金,银和银/钯共烧的未烧绿带。
Abstract:
A nonlinear resistor which exhibits substantial temperature independence over a wide range of temperatures, including low temperatures, is provided. The resistor is formed of a zinc oxide-based ceramic composition which exhibits nonlinear voltage/current characteristics and is essentially unafffected by magnetic fields. The nonlinear resistor provides protection for electrical devices in a circuit from voltage surges and/or transients. In a preferred form, the resistor is manufactured as a multilayer capacitor-type device.
Abstract:
An electromagnetic coil for high temperature and high radiation application in which glass is used to insulate the electrical wire. A process for applying the insulation to the wire is disclosed which results in improved insulation properties.
Abstract:
A method for the nondestructive testing of voltage limiting blocks includes the steps of providing several discrete electrical contacts across the block, sequentially applying to each of the contacts a voltage to determine the corresponding current and utilizing the current and voltage values to determine constants related to the microstructure of that particular location. The constants can then be utilized to derive a contour map which will be indicative of a hot spot in such block as determined by a maxima of the contour map.
Abstract:
A multi-channel, dual-band, radio frequency (RF) transmit/receive (T/R) module, for an active electronically scanned array, is provided. The module includes a compact, RF manifold connector and at least four T/R channels. Each of the T/R channels includes a notch radiator, a diplexer coupled to the notch radiator, a power amplifier, including at least one dual-band gain stage, coupled to the notch radiator, a low noise amplifier, including at least one lower-band gain stage and at least one upper-band gain stage, coupled to the diplexer, and a T/R cell, including a phase shifter, a signal attenuator and at least one dual-band gain stage, coupled to the power amplifier, the low noise amplifier and the manifold connector.
Abstract:
A method of producing an LTCC substrate having improved cavity bondability is disclosed that involves providing a stack of green ceramic tape sheets having a cavity, placing a template having an opening corresponding to the cavity over the stack, placing a stretchable sheet of material coated with graphite or zinc stearate over the template, isostatically laminating the stack to produce an LTCC substrate having a cavity, and removing the template and sheet of stretchable material from the stack.
Abstract:
Disclosed is a method of forming an LTCC structure that involves providing at least a first ceramic tape sheet, laminating at least a second ceramic tape sheet to the at least a first ceramic tape sheet to form a substructure, laminating at least a third ceramic tape sheet to the substructure to form an intermediate structure, and laminating at least a fourth ceramic tape sheet to the intermediate structure to form an LTCC structure.
Abstract:
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2. The composition comprises a mixture of finely divided particles of 25-50 vol. % borosilicate glass and 50-75 vol. % high silica glass. The composition can be used with a polymeric binder to produce an unfired green tape which is co-fireable with high conductivity metallurgies such as gold, silver and silver/palladium.