Abstract:
The invention relates to a circuit array with an antenna input (1), a signal input (2) and a signal output (3), a switch unit (4), in which the antenna input (1) is connected to a first protective device (6) against electrostatic discharges, wherein the first5 protective device (6) is a band-pass filter in a π configuration. An advantage of the first protective device (6) is that when it is used in a mobile telephone, a band-pass filter in the front-end module can be omitted. In addition, the band-pass filter has very favorable filtering characteristics, so that ESD-related interference can be effectively suppressed. The invention also relates to a circuit module and the use of the circuit module.
Abstract:
Method for adjusting the filter characteristic of a microwave ceramic filter which has coupled ceramic resonators, that are ceramic resonators configured in a ceramic body, varies the distance between input/output connections and a grounding connection.
Abstract:
A composition and process for producing a storable, pumpable alkaline cleaning concentrate comprising an aqueous alkali metal hydroxide having dispersed therein alkaline builder and surfactants, and a stabilizer therefor comprising the combination of:(a) polyacrylic acid or alkali metal polyacrylate; and(b) glycerol or polyglycerol.
Abstract:
A monolithic microwave ceramic filter has a ceramic body with an outer surface, resonator bores being formed in the ceramic body and defining surfaces within the resonator bores, and coupling voids being formed in the ceramic body between the resonator bores. A process for metallizing the monolithic microwave ceramic filter includes covering at least the coupling voids with ceramic foil, and subsequently galvanically metallizing the ceramic body to produce a metallizing over at least a portion of the outer surface of the ceramic body and the surfaces within the resonator bores.