Abstract: A radar transmitter/receiver arrangement for use, for example, in automotive vehicle control in which R.F. energy from a frequency modulated oscillator is applied to an antenna for transmission and to one input of a mixer by way of a rat-race device, and RF energy reflected from a target and received at the antenna is applied to another input of the mixer by way of the rat-race device.

Abstract: A high-frequency power transistor is suggested in which the emitter and base contacts, as well as the collector contacts, occur in a principle plane on the silicon layer. A metallization can be arranged on the oppositely located second principle plane, which enables a connection with the heat sink in an easy manner. Shield grids can be provided within the substrate in order to compensate for the effect of unwanted depletion-layer diodes to a great extent.

Abstract: A high-frequency transformer is proposed in which at least one elastic carrier (18, 20) is constructed with openings (22 to 29, 52, 69, 73, 74) and also with cutouts (30 to 33, 53, 70, 71, 75, 76, 77) in such a way that the regions on the carrier (18, 20) delimited by the cutouts form a tongue (72, 78), which may be lifted to insert a magnetic core (13 to 16). Around the cores (13 to 16) in the openings (22 to 29, 52, 69, 73, 74) conductor tracks (51, 57, 58, 80, 81, 92) are mounted on one or both sides of the carrier (18, 20), and are completed as a turn or as a continuous winding by conductor track parts (64, 66, 67) mounted on bridges (17, 19, 21). At definite locations, the conductor tracks (51, 57, 58, 80, 81) have bonding pads (85, 89, 91) for surface mounted devices (38 to 41, 86, 87). In common with the insulation spacings between the conductor tracks, the conductor track widths are adjusted to the dimensions of the surface mounted devices (86, 87).

Abstract: A directional H.F. broadband transformer made by a printed circuit technique includes an insulating support carrying a two-hole ferrite core. A planar coil arrangement includes two web spirals wound around outer legs of the core and each being coupled to an elongated web arranged in the same plane and passing through a corresponding hole of the core. The two elongated webs are formed with an input terminal, an output terminal and a tap terminal of equal impedance. An isolated conductive layer mounted above the webs on the insulating support is capacitively coupled with the coil arrangement and with a ground layer to reduce values of series connected distributed capacitors resulting between respective webs and the ground layer.

Abstract: To improve the space factor of a barium titanate resonator, the resonator is a tubular carrier (11) having metal layers on the inner and outer surfaces. At least one of the metal layers is axially interrupted by a slit. Terminal connections for the resonator are located adjacent the slit on the interrupted layer, and on the continuous layer. For shielding, preferably, the continuous layers at the outside and end tabs (FIG. 4) may additionally be provided. More than one axially staggered inner/outer electrode layer system may be provided on one tubular carrier.

Abstract: An inductive pressure sensor is proposed which has at least one coil embodying a frequency-determining part of an oscillator and disposed at a distance from a diaphragm which is deflectable in accordance with pressure. When pressure is exerted on the diaphragm, the inductance of the coil and thus the oscillator frequency are shifted. The coil is a flat, spiral element and the diaphragm has a surface of highly conductive or ferrite material. It is further provided that two oscillators of identical design and having corresponding coils are used, operating under identical thermal conditions. Either one oscillator operates at a fixed frequency, so that both absolute-pressure measurements and differential-pressure measurements relative to ambient pressure can be made, or else the two oscillators can be detunable in accordance with pressure, so that differential-pressure measurements between two media can be made. The output signal is then obtained by mixing.

Abstract: To make inductance elements, thick film electrically conductive paste, which may include precious metal such as silver, are applied by a deformable stamp on a ferrite core which, for example, can be someone hump shaped, for adhesion to a carrier (30) and formed with openings thereto, the stamp being shaped to fit within the opening and deforming to penetrate the opening to apply the thick film conductive paste in form of conductive tracks thereon. Conductive tracks can be applied, previously, to a substrate carrier (30), which are then joined by the paste strips to form interconnected windings (FIGS. 1a, 1b); or the ferrite may be in form of a toroidal core (34), on which the conductive tracks are applied around all surfaces, to form connected windings thereon, the deformable stamp having a projecting tip which can fit within the opening of the toroidal core.