Abstract: Two unequal impedance input port RF power combiner is used alone or as a component of a three equal input impedance input port RF power combiner with isolation between all ports. The combiner has a band pass of at least two octaves and the capacity to handle at least 5 kw. The combiner may be used in a transmission system and methods of isolation of the input ports by the resistive shunting of selected transformer windings are disclosed.

Abstract: A high power, high frequency auto transformer with a non-integer turns ratio and a bandpass filter frequency response.

Abstract: A system and method for combining RF signals by a series of in-phase combiners. The system uses a series of switched, high efficiency amplifiers which may be selectively operated to obtain a desired output signal, such as an Amplitude Modulated (AM) signal. The output signals of the amplifiers are combined by a series of in-phase combiners. In a high linearity system a feedback loop is used to correct for combiner losses. The RF power normally lost in the combiners is recovered and available to increase the overall combiner efficiency.

Abstract: A method and apparatus for activating PIN diodes. The PIN diodes are formed as a switch around terminals of another device. When the PIN diodes are made conductive, they shunt the terminals of the device, operatively by-passing the device. The PIN diodes are made conductive by RF signals which selectively provide a bias level to the PIN diodes.

Abstract: A high speed antenna coupler and method for rapidly switching binary weighted values of inductance and capacitance into and out of the circuit between an antenna and a utilization circuit without unacceptably degrading the coupler or slowing the switching action. PIN diodes are utilized as switches and the control wires for the PIN diodes are disposed interiorly of the copper tubing which forms the inductance elements. The control wire for a particular inductor is withdrawn from the interior of that inductor adjacent the mid-point thereof so that the control wire will be at the same RF potential as the inductor being controlled. Two diodes are utilized for each inductor, one connected to each end thereof, so that only half of the normal reverse bias is required for switching purposes. Where a transformer is utilized to couple the antenna to the utilization circuit, the control wires may be disposed interiorly of the copper tubing which forms the winding of the transformer.