U.S. Philips Corporation

Frans C De Ronde

Kurt H Carlsson

Jan Olov Appelquist

Bengt U Imberg

A suspended microstrip circuit having a dielectric substrate arranged in parallel between two parallel metal planes. First and second strip conductors are provided on the substrate, the second strip conductor being in parallel with the first strip conductor and coupled thereto. A wave phenomenon can propagate through the conductor pair in an odd mode. The metal box accommodating the microwave circuit may now be much greater so that in most cases one box is sufficient. Microwave components such as Magic-T, series-T, shunt-T, circulators, filters, attenuators, can be implemented with the suspended microstrip line.

Suspended microstrip circuit for the propagation of an odd-wave mode

A microwave device is disclosed comprising a microstrip line pattern including an open ring forming a 1/2.lambda. resonator having a narrow gap in which the electromagnetic field is closely tied to the ring.

Microwave device provided with a 1/2 lambda resonator

An energy supply arrangement for feeding microwave energy from a microwave source to the oven cavity of a microwave oven. The energy supply arrangement comprises a transmission line of the type having a conductor arranged at a small distance from a ground plane, a so-called micro-strip line. This micro-strip line is arranged within the oven cavity near the bottom wall and is, for example, in the shape of a spiral conductor disposed about a central energy feed point and dimensioned such that it radiates energy into the cavity at the same time that energy propagates along the line.

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Eindhoven, Netherlands

Frans C De Ronde