Abstract: A patch antenna with at least one patch resonator (10, 20) for the microwave range is described, which antenna is in particular suitable for an embodiment as a multilayer antenna with short-circuit conductor (14, 24) and for SMD mounting on a printed circuit board. The antenna furthermore has a bandwidth sufficient for use in mobile telecommunication also when substrates (11, 21) having the same dielectric or permeability value are used. This is achieved essentially in that the feed terminal comprises at least a first metallization piece (17) which extends on a first side face (112) of the resonator between the ground metallization (12) and the pattern (13) of metal patches, while the input impedance of the antenna is adjustable through a change in the dimensions of this metallization piece.

Abstract: A patch antenna with at least one patch resonator (10, 20) for the microwave range is described, which antenna is in particular suitable for an embodiment as a multilayer antenna with short-circuit conductor (14, 24) and for SMD mounting on a printed circuit board. The antenna furthermore has a bandwidth sufficient for use in mobile telecommunication also when substrates (11, 21) having the same dielectric or permeability value are used. This is achieved essentially in that the feed terminal comprises at least a first metallization piece (17) which extends on a first side face (112) of the resonator between the ground metallization (12) and the pattern (13) of metal patches, while the input impedance of the antenna is adjustable through a change in the dimensions of this metallization piece.

Abstract: The invention relates to a dielectric resonator antenna (9) as well as a transmitter, a receiver and a mobile radiotelephone that includes a dielectric resonator antenna. To improve known possibilities of reducing the volume of the DRA (9), which are offered by the planes of symmetry (10) in a DRA, there is proposed to provide an electrically conducting coating on at least one curved surface (11) into which the tangential component of an electric field of an eigenmode assigned to the dielectric resonator antenna (9) disappears. As a result, the volume of the DRA (9) can be reduced considerably, although furthermore the same mode is found at the same frequency. Since there are a plurality of such curved surfaces (11), a particularly advantageous surface (11) can be selected depending, for example, on the desired degree of miniaturization, required bandwidth of the evolving antenna and manufacturing conditions.

Abstract: A dielectric resonator antenna is a cuboid having a first edge, a second edge and a third edge. The first edge is the shortest edge and forms part of a first surface and a second surface of the cuboid. The first surface is for coupling to a transmission line and the second surface is for mounting on a circuit board. The second and third edges have substantially equal lengths. Further, the first and second surfaces are coated with a conducting layer.

Abstract: A transmitter-receiver for four different frequency ranges of two transmission systems has four dielectric resonator antennas (DRAs) for each frequency range to improve and a simplify separation of different frequency ranges. Two DRA's are provided for reception and transmission in the first transmission system, and two other DRA's are provided for reception and transmission in the second transmission system.

Abstract: The invention relates to a circuit arrangement with a piezoelectric transformer having two electrodes arranged on the primary side of the transformer and such a piezoelectric transformer itself. Piezoelectric transformers of this type are used, for example, for the power supply or control of lamps or electron tubes. For controlling such a piezoelectric transformer directly on the primary side by a most frequently available DC voltage, instead of an AC voltage as is customary, according to the invention a DC voltage source is connected to the electrodes and a switching device is provided for interrupting the supply of voltage to at least one electrode, the positions of the switching device being dependent on the state of expansion of the primary side of the transformer. The switching device is thus periodically closed and opened, the applied DC voltage is thus interrupted periodically.

Abstract: A circuit arrangement for operating a discharge lamp comprising an oscillator for generating a high frequency input voltage and a piezo-electric transformer with input terminals coupled to the oscillator and output terminals. A load circuit is coupled to the output terminals of the piezo-electric transformer and includes terminals for lamp connection. The load circuit comprises an adjustable capacitor which forms a very simple device for controlling the light output of the discharge lamp over a wide range.