Abstract: Input power is applied to an input inductor/capacitor combination. The gates of each of two FETs are connected to the other side of the input inductor. The source of each FET is connected to ground potential. The drain of the first FET is connected to a first output port, and the drain of the second FET is connected to a second output port. A signal input on the drain of one of the FETs is 180.degree. out of phase with the same signal passing through the two FETs to the drain of the other FET. The gate and drain of the first and second FETs have series-connected resistance/inductance feedback networks to give input and output match. A series-connected isolation resistor and inductor are connected between the first and second output ports for feeding signals of reduced amplitude to offset signal feedback through the FETs.

Abstract: A broadband 180 degree hybrid having lumped or semi-lumped elements is comprised of a network of low and high pass filters. A 180 degree phase differential is obtained by splitting an input signal from a first input. A first portion of the split signal is passed through a low pass filter and a second portion is passed through a high pass filter. The phase differential is maintained at 180 degrees. A zero (0) degree phase differential is obtained by splitting an input signal from a second input and passing both portions through a pair of low pass filters or through a pair of high pass filters.

Abstract: Apparatus and method for parallel operation of radio frequency transistor amplifier circuits in a Class D mode of operation at radio frequency signal ranges without the use of frequency limiting components is disclosed. A driver circuit provides the input signals for each radio frequency transistor amplifier circuit. A transformer is disclosed that combines the output signals of the radio frequency transistor amplifier circuits while matching the amplifier circuit impedance and the transformer load impedance (i.e., the antenna impedance). The transformer eliminates the need for DC blocking capacitors between the primary and secondary windings of the transformer. The transformer/power combiner includes a plurality of (1:1) transformer units having the unit input terminals (power amplifier output signals) coupled in parallel and having unit output terminals coupled in series.

Abstract: A signal transmission and receiving system includes a controller or central processor unit and one or more peripheral units interconnected by a transmission line or bus having a plurality of conductors. Instead of providing terminator devices for the opposite ends of the bus in the controller and in the last peripheral unit connected to the bus, respectively, both terminator devices are located in the controller and the bus is looped back on itself so that both ends of the bus can be connected to a connector having two sets of contacts, one set being connected electrically to the conductors at one end of the bus and the other set of contacts being connected electrically to the conductos at the other end of the bus.

Abstract: A non-reciprocal bidirectional duplexer includes a first transmission medium extending from a first terminal to a third terminal; a second transmission medium extending from the second terminal to the third terminal; and a plurality of non-reciprocal, bidirectional phase shifting elements, coupling the transmission mediums and spaced along them; each of the phase shifting elements includes means for amplifying a signal in a first direction from the first to the second transmission medium and for amplifying a signal in the second direction from the second to the first transmission medium; and means for establishing a phase differential between the signals moving in the first and second directions.

Abstract: A coupler assembly for noninvasive coupling to conductor wires of a twisted pair cable of a data bus uses mating pairs of E-shaped electromagnets defining a pair of electromagnet cores having windings about central legs thereof electrically connected to a control unit for sensing and transmitting signals along the data bus. A lower member with lower electromagnets is mounted to a panel, while an upper member with upper electromagnets includes a circuit substrate having trace windings about substrate apertures receiving the central legs of the upper electromagnets, an electronic subassembly to which the windings are electrically connected to amplify signals received and signals to be sent, and a shielded electrical connector secured at a connector end connected to circuits of the electronic subassembly and matable with a connector of a cable extending to the control unit.

Abstract: The possible length of tap lines to the serial bus of a local area network is extended to about 0.7 meter by inserting an inductance 2 into the serial bus 1, and connecting a further coaxial cable 7 to a central tap 3 of the inductance. Preferably, the inductance 2 is a printed-circuit pass-through filter. The longer tap lines are particularly useful for connection of rack-mounted digital equipment in broadcasting studios, where it is inconvenient to place the equipment directly adjacent to a typically floor-level network cable.

Abstract: A miniature wide-band microwave power divider comprising a common terminal connected to a plurality of parallel signal paths with each signal path comprising a low pass and a high pass filter made up of discrete components. Use of discrete components allows the entire power divider to be incorporated on a single chip. Isolation is achieved between the signal paths by isolation means comprising resistors.

Abstract: A signal splitter connects a radio frequency signal source to a pair of output loads, e.g., separate receivers, and has an increased high-end frequency response as compared to similar devices. First and second tubular cores are disposed side by side, each with a pair of toroidal windings therein. An input end of the first winding of the first core is coupled to the signal input and the second end of the second winding to ground, respectively, while output ends of the windings in the second core are connected to the output loads. The other ends of the windings of the two cores are respectively connected to one another to form two single-pair twisted connections. These are passed into through holes of a printed circuit board and are soldered or otherwise electrically connected to a printed conductor on the board. This construction reduces stray inductance significantly and also provides better mechanical mounting than previous devices. The two tubular cores could be fused as a single core with two holes.

Abstract: A radio-frequency (rf) power combiner or divider structure containing distributed amplifier components and having broadband operating characteristics, and operable with net gain or practically no insertion losses. The divider structure includes an input transmission line having series-connected impedances that interconnect with active devices, such as field-effect transistors to form a practically lossless line. The active devices provide gain between distributed points in the input transmission line and distributed points in multiple output transmission lines, which are similarly structured as series-connected impedances. Each output transmission line supplies one of the divider outputs. In the combiner form of the device, there is a single output transmission line and multiple input transmission lines, coupled to the output line in a distributed manner by active devices.

Abstract: A tap device for use in broadband communications systems includes a circuit board mounted on a cover plate assembly which is removably connected to a base housing. The circuit board includes an RF signal coupling element and an RF signal splitting element. The output of the RF signal coupling element and the input to the RF signal splitting element are each connected to a separate female receptacle positioned on the circuit board. The female receptacles are designed to receive an intermediate circuit which, when inserted into the female receptacles, is electrically connected between the RF signal coupling element output and the RF signal splitting element input. The intermediate circuit may consist of a short circuit feedthrough, or a plug-in fixed or variable degree attenuator.

Abstract: A receiver multicoupler having multiple, isolated outputs generated from a single input comprising a no loss signal splitting network connected to the input having insignificant power absorption and being in the form of parallel tuned circuits providing multiple voltage outputs from a single input and a plurality of very high input resistance voltage amplifiers, each of the amplifiers having an input connected to the signal splitting network, and each of the amplifiers acting as an impedance transformation device and supplying isolation.

Abstract: A system is disclosed for selectively serially coupling a plurality of stations in a communications network into a single communications path. In the system of the invention, a plurality of tap boxes are serially coupled into the single communications path. Each station is coupled to a desired associated one of the tap boxes by way of an associated tap cable. When the tap cable is connected to a first portion of the tap box, a first impedance corresponding to the characteristic impedance of the single communications path is serially coupled into the single communications path to enable the station associated with the tap cable to be coupled to the single communications path by way of the first impedance. When the tap cable is connected to a second portion of the tap box, the first impedance is effectively removed from the single communications path and a test impedance is coupled to the tap cable to enable the station associated with the tap cable to test itself.

Abstract: A signal dividing network is provided as an RF splitter for use in supplying N load devices of varying impedances with RF signals such that each of the N signals is of essentially the same magnitude and phase. The splitter includes a plurality of step-down auto transformers, each having a primary and a secondary defining a series circuit between a common RF source and ground. An output terminal is defined as the midpoint of the primary and secondary windings on each transformer and the output terminals are connected together in common whereby all of the primary windings are connected in parallel and all of the secondary windings are in parallel. Each output terminal has several outputs connected thereto such that the splitter has a total of N outputs for driving N load devices.

Abstract: An in-phase power divider is constructed of a double field-effect transistor having a common source, first and second gates and first and second drains. The gates are coupled together and adapted to receive a radio frequency signal of power P to be power divided. The power divided output signals each at substantially P.div.2 or more appear at the drains. An alternative power divider for producing unequal power division is constructed of a double dual gate FET having, in addition to the above-mentioned elements, third and fourth gates. By appropriate unequal application of gate bias to the additional gates unequal power division is effected.

Abstract: An in-phase power combiner is constructed of a double field-effect transistor having a common drain, first and second gates and first and second sources. The gates are adapted to receive radio frequency signals of powers P1and P2, where P1=P2, to be power combined. The combined power output signal P equal to at least P1+P2 appears at the drain. An alternative power combiner for producing power combination of two unequal power input signals is constructed of a double dual gate FET having, in addition to the above-mentioned elements, third and fourth gates.

Abstract: Microwave couplers such as power splitters and combiners for coupling a common terminal to two branch terminals are disclosed which are compact and provide gain. Each leg of the branching circuit comprises a dual gate FET device. The dual gate FET device has its first gate connected to receive an input signal, its second gate biased and terminated in accordance with the phase shift desired from that FET device and its drain coupled to provide an output signal. Where equal phases are desired from both legs, the second gates of all of the FET devices are capacitively terminated. Where a differential phase shift is desired over the two legs, the second gate of the FET device in one leg is capacitively terminated and the second gate of the FET device in the other leg is inductively terminated. The bias voltages on the second gates are preferably selected to produce the same gain for both.

Abstract: One circuit is a low frequency, wide band multi-directional tap that exhibits good match characteristics with low through loss. The circuit has input and output terminals conductively interconnected, a tap output terminal, an inductive winding having n.sub.1 /n.sub.2 series turns and a series resistor coupling from the tap on the inductive winding to the tap output terminal. The other circuit is a low frequency, wide band multi-directional signal splitter that also exhibits good match characteristics with low through loss. The circuit has an input terminal and two output terminals interconnected by three core transformers each having an isolation resistor associated therewith.

Abstract: A multicoupler for coupling a single energy source to a plurality of utilization devices including an impedance transformer connected to the source and driving at least one active device such as a pair of series connected emitter followers, a plurality of isolation networks each connected to the output of the active device with each of said isolation networks providing an output for at least one utilization device, and structural arrangements for connection of the isolation networks to the output of the active device to minimize undesirable inductive effects.

Abstract: A current mode data or power bus which provides communication between two or more terminal devices over a common, single-channel medium. The data bus comprises a pair of wires, twisted to form a succession of loops and short-circuited at both ends, together with an arbitrary number of bus couplers, one for each terminal. The bus couplers are formed by separate, disengageable core elements. Each bus coupler is inductively coupled to the twisted wire pair by inserting one or more core legs of the bus coupler through adjacent loops in the twisted wire pair; each wire loop around a core leg then constituting a one-turn transformer winding of the coupler. In this manner, separate terminals can be readily coupled to or decoupled from the current mode data communication bus without the need for making spliced, galvanic connections. This bus configuration is readily adaptable to single or multiphase power transmission.

Abstract: A linear attenuator using a dc control current to change the rf resistance of PIN diodes in series and parallel with the load. As the control current changes, the rf resistance of the series diode varies inversely and the parallel diode varies directly providing attenuation which changes linearly as a function of the control current through the series diode.

Abstract: A power splitter is disclosed for dividing radio frequency (R.F.) power applied to an input terminal equally among n number output terminals, where n.gtoreq.2 and is an integer, irrespective of the impedances at the input or at the output terminals. The power splitter utilizes n number .lambda./4 inner conductors disposed in a .lambda./4 housing, which provides a common electromagnetic shield. The input terminal is formed by connecting together the first end of each inner conductor, the first ends being present at a first opening in the housing. The second ends of the inner conductors, which are all present at a second opening in the housing, are connected together outside the housing by (n-1) number .lambda. lines so as to form an electrical wheel. Each end at the second opening is an output terminal of the power splitter. A power combiner is disclosed for summing at an output terminal R.F. power applied to n number input terminals, where n.gtoreq.

Abstract: An isolation device coupled between an antenna network and a fixed tuned VHF/UHF signal splitter includes a first bifilar transmission line and a second bifilar transmission line wound with multiple turns about separate toroidal portions of a magnetic core. Each of the bifilar transmission lines has first and second conductors. At an input port of the device, the first conductor of the first transmission line and the second conductor of the second transmission line are coupled to respective antenna terminals of the antenna network and the second conductor of the first transmission line and the first conductor of the second transmission line are coupled together. At an output port of the device, the second conductor of the first transmission line and the first conductor of the second transmission line are coupled to respective input terminals of the signal splitter and the first conductor of the first transmission line and the second conductor of the second transmission line are coupled together.

Abstract: The present invention relates to a combiner network comprising n input terminals where n is a positive integer greater than 1. Each of the input terminals is connected to a first common point by a resistive element. n transformers are provided with each transformer having a primary and a secondary winding. Each of the n terminals is connected to one end of a primary winding in a one-to-one relationship. Each primary winding has a second end connected to a second common point wherein the secondary windings of the n transformers are connected in series to form a first and a second secondary terminal. The first secondary terminal is connected to the second common point. The second secondary terminal is an output terminal for the network. The primary and secondary windings of the n transformers have a turns ratio of n:1 so that when each of the n input terminals is fed by identical signals, zero net flux circulates in the n transformers.