Ericsson Ab

Marconi Communications Gmbh

Robert Boschgmbh

Tesat-spacecom Gmbh & Co Kg

Willibald Konrath

Martin Schallner

Klaus Scholl

Klaus Junger

Haiko Schmelcher

Stefan Kern

Lothar Ubele

Werner Horzer

Ulf Muller

Jif Muller

Helmut Greiner

Reinhold Schmitt

Dieter Kienzle

Junger Klaus

A method for testing the tightness of a housing involves providing a pressure sensor in a housing, sealing the housing, and detecting a pressure level in the housing.

Method for leak testing a housing

In the manufacture of a high-frequency assembly, a plurality of components, at least one () of which is frequency-specific, are placed with respect to each other using a placing apparatus and are interconnected. In a specimen of the frequency-specific component () a feature () which encodes the frequency is looked for. The specimen is built in if the feature () is found in the specimen and is judged to be correct; otherwise the specimen is rejected.

Method for manufacturing a high-frequency assembly

A device for assembling electronic circuits comprises a placing station () for placing circuit components on a circuit carrier () held at a placing location (), a fixing station () for fixing the circuit components to the circuit carrier () under the effect of heat, and a belt conveyor means () for conveying a circuit carrier from the placing location () to a take-over location () of the fixing station (). The fixing station () comprises a heatable zone () and a manipulator () for raising the circuit carrier () from the take-over location () and placing it in the heatable zone (). A continuous belt conveyor () of the belt conveyor means extends from the placing location () up to the take-over location ().

Method for assembling electronic circuits

An automated circuit board assembly system includes at least one movable circuit board receiver that is equipped with an empty circuit board or a hybrid circuit which is transported towards an uptake location at which components are assembled to the board, and an uptake mechanism positioned at the uptake location which detects the circuit board position in preparation for the assembly process. An alignment device positions the circuit board receiver in a predetermined directional position at the uptake location.

Automated circuit board assembly positioning system

An adhesive-dispensing method applies a pattern of adhesive onto a circuit-board carrier such that any discontinuities in the pattern, i.e. starting-points, end-points or turning-points, are outside a footprint of a pair of substrates or MMICs intended to be attached, adjacent each other and spaced apart, to the circuit-board, and in particular outside such footprint in the area of transition between one substrate/MMIC and the other. The adhesive is preferably applied in straight lines and in a direction substantially transverse to the direction of transition between the two substrates/MMICs.

Method for dispensing adhesive on a circuit-board carrier member and circuit-board provided thereby

On a circuit-board intended for constant-wire-length (CWL) bonding, one or more special &ldquo;test&rdquo; pairs of bonding pads are provided along with, in each case, a series of markings adjacent the pads. In use, the board is populated with CWL bonds (this includes the normal circuit-related RF bond-pads as well as the test bond-pads) and the test bonds are distorted so that the bond-wires in question lie aligned against the markings. The alignment position relative to the markings indicates whether the bond-wires for the whole board are of correct or incorrect length. Measurement may be either absolute, in which case the markings are associated with a scale indication, or relative, in which case one of the markings will usually be visibly distinguished from the rest in some way. Depending on the length determination, the bond-forming device (e.g., ball and wedge) is adjusted so as to reduce any difference between the indicated length and the desired length when the next board is populated or when the next multi-board production run takes place.

Method for monitoring the length of constant-wire-length bonds and apparatus therefor

A frequency-generator circuit employs the same circuit element (preferably a varactor) to perform the functions of parametric frequency-divider and frequency-adjustment element for an oscillator used to pump the parametric frequency-divider. The varactor preferably has a flat gamma-characteristic (gamma preferably >2) over a required bias-voltage adjustment range corresponding to the required frequency-adjustment range.

Frequency-generator circuit

The method for adjusting a resonance frequency of a ring resonator formed as a strip line ring exactly includes removing successive amounts of conducting material from one or more positions ( ) on the strip line ring ( ) with a laser until the ring resonator has a desired predetermined resonance frequency.

Method of adjusting a resonance frequency of a ring resonator

The ring resonator of a high Q-factor has a planar conducting ring (,) that is dimensioned in regard to its conductor width (w) and its diameter (d) so that it resonates in an odd harmonic or overtone vibration mode but not in its fundamental mode.

Growing community of inventors

Cottenweiler, Germany

Willibald Konrath