Abstract: A circuit for determining power changes in an RF circuit includes first and second temperature sensitive resistors connected in parallel with an RF input terminal so as to have a common junction therewith. The first resistor has a positive temperature coefficient of resistance and the second resistor has a negative temperature coefficient of resistance. A DC input terminal is connected to one of the temperature sensitive resistors and an output terminal is connected to the common junction of the two temperature sensitive resistors. Third and fourth temperature sensitive resistors have a common junction. The third resistor has a positive temperature coefficient of resistance and the fourth resistor has a negative temperature coefficient of resistance. The DC input terminal is also connected to one of the third and fourth temperature sensitive resistors, and an output terminal is connected to the common junction of the third and fourth temperature sensitive resistors.

Abstract: A transmission line device includes at least two rectangular plates of an insulating material having opposed planar surfaces and edges. A transmission line of a conductive material is on a surface of at least one of the plates and extends between two opposed edges of the plates. The plate having a transmission line thereon has holes therethrough adjacent its opposed edges, which holes extend to the ends of the transmission line. The holes are filled with a conductive material which makes electrical contact to the ends of the holes. Ground planes of a conductive material are on a surface of the plates. The plates are stacked together with the surface having the transmission lines facing a surface of another plate, and the ground planes facing outwardly. The plates are mechanically secured together either by metal clips or by a suitable cement between the opposed surfaces of the plates. Terminals are at the edges of the plates and are connected to the ends of the transmission line and to the ground planes.

Abstract: An RF termination load includes a base of an electrically and thermally conductive material having opposed surfaces. A recess is in one of the surfaces of the base and a groove in the one surface extends from the recess to an edge of the base. A resistor is seated in the recess in the base. The resistor includes a substrate of an electrically insulating material having opposed surfaces and a resistance film on one of the surface of the substrate. A first contact of a resistance film is on the one surface of the substrate at one end of the resistor and a second contact of an electrically conductive material is on the one surface of the substrate at the other end of the resistor. The second contact extends over an edge of the substrate and over the other surface of the substrate. The resistor is mounted in the recess with the second contact being seated on and contacting the base. An RF cable has an end in the groove in the base.

Abstract: A temperature compensating voltage variable attenuator includes at least two temperature variable resistors. The temperature variable resistors have different temperature coefficients of resistance, preferably, with one temperature variable resistor having a positive temperature coefficient of resistance and the other temperature variable resistor having a negative temperature coefficient of resistance. The temperature coefficient of resistance of the temperature variable resistors being such that the attenuation of the attenuator varies with changes in temperature of the attenuator. A voltage variable heater resistor is adjacent both temperature variable resistors so that a change in the voltage applied to the heater resistor changes the temperature of the heater resistor. The heat from the heater resistor is applied to the temperature variable resistors so as to change the resistance of the temperature variable resistors. This provides a controlled change in the attenuation of the attenuator.

Abstract: An attenuator includes a flat, substantially rectangular substrate of an insulating material having a surface. A plurality of termination areas of a conductive material are on the substrate surface and are spaced from each other. Three resistors are on the substrate surface and are connected in a series parallel combination between the termination areas. The resistors may be formed by three separate resistance layers extending between and connected to the termination areas, or a single resistance layer extending between and connected to the termination areas. A shunt capacitor is on the substrate surface and is connected to one of the resistors. The shunt capacitor is formed by an area of a conductive material on the substrate surface and overlapping a portion of the resistors, and a dielectric layer between the conductive area and the resistor.

Abstract: The temperature coefficient of resistance (TCR) of a resistor having a layer of a resistance material on a surface of a substrate and a termination layer of a conductive material at opposite ends of the resistance layer is adjusted by changing the area of at least one of the termination layers. The area of the termination layer is changed by removing a portion of the termination layer. The portion of the termination layer can be removed by making a cut through the termination layer which extends along a line across at least a portion of the termination layer. This method can be used to form matched pairs of resistors by first adjusting the resistance value of at least one of a pair of the resistors at room temperature to provide the resistors with substantially the same resistance values. The TCR of one of the resistors is then adjusted by removing a portion of one of the terminations of the resistor until both resistors have substantially the same TCR.

Abstract: A high power resistor includes a substrate of an insulating material having opposed first and second surfaces, and a strip of a resistance material on the first surface of the substrate. The resistance strip has side edges which are spaced from the side edges of the substrate. A contact of a conductive material is at each end of the resistance strip. Each contact extends to a separate end of the substrate, across the end and over a portion of the second surface of the substrate. The portions of the contacts which are on the second surface of the substrate or no longer than the portions of the contacts on the first surface of the substrate. At least one heat sink strip of a conductive material is on the second surface of the substrate. The heat sink strip is of a size that it does not overlap the resistance strip so as to minimize any capacitance between the heat sink strip and the resistance strip.

Abstract: A phase shifter in which the change in phase changes with changes in temperature. The phase shifter includes a plurality of capacitors and inductors connected in series relation to form a filter network. Each of the capacitors has a dielectric material with a temperature coefficient so that the capacitance of the capacitor varies with temperature. Each of the inductors has a ferrite material which has a temperature coefficient so that the inductance of the inductor varies with temperature. The temperature coefficients of the dielectric material of the capacitors and the ferrite material of the inductors have the same sign, i.e, either negative or positive, and preferably are of the same value.