Abstract: A package for matching the characteristic impedance of a transmission line to the impedance of a pulsed semiconductor laser diode so that short duration pulses of light can be produced with a fast repetition rate. The package has a toroidal transformer in a cavity of a main body, with a multiturn primary connected to a transmission line. The laser diode is mounted at the edge of a known sandwich between two thin metal plates separated by an insulating layer. A spacer and metal cover cap are placed over the sandwich, and a screw passing through holes of all the parts is threaded into the main body. The screw passing through the transformer core forms a one-turn secondary. Not only does this allow the matching of the characteristic impedance, but also provides heat sinking for the diode. Assembly with a screw makes the unit easy to fabricate, and to replace the laser diode sandwich.

Abstract: An arrangement for applying a DC bias current to an RF active component, such as a field effect transistor, serially-connected with an RF transmission line. The biasing current is supplied by a transmission line section connected at a junction to the transmission line. Two conductive strips, connected in parallel with the transmission line, on opposite sides of the junction, form a band-pass filter. Each of these strips is situated at a distance from the junction which is equal to approximately one-eighth of the wavelength of the signal frequency transmitted on the transmission line.

Abstract: When two pieces of magnetic material are clamped together in a magnetic circuit, a silicone rubber piece is used to control the clamping pressure in order not only to prevent material stress at the clamping surfaces but also to compensate for the effects of temperature expansion of the magnetic material.

Abstract: A filter connector incorporates a capacitor formed in the connector with dielectric material consisting of discrete particles maintained in electrical contact with the live and ground electrodes. Since the dielectric material is handled in non-rigid bulk form, no breakage is encountered during assembly and handling. Disassembly of the connector for repair is feasible. Both method and apparatus are described.

Abstract: A printed hybrid quadrature 3 dB signal coupler using discrete components for the capacitive coupling and plated through holes to effect an approximation of twisted wire coupling whereby the completed product occupies much less physical space on a printed circuit board than the normal quarter-wavelength coupler.

Abstract: A coaxial cable coupler that provides a low impedance through conductor for a passive coaxial transmission cable and a high impedance tap to periodic transmission means and receiver means. The tap connection is a removable connection that is formed by a resilient electrical conductor compressed between exposed portions of the main transmission through conductor and an exposed tap conductor interconnecting the high impedance networks of the transmission means and the receiver means.

Abstract: A tunable YIG band pass filter which can be manufactured with reliably constant characteristics. A housing with slots for receiving insulating plates having a conducting layer on the side edge, and holes for receiving YIG elements over which indentations in the side edges having the conducting layers are located, provides the coupling loops of the filter to the YIG elements. The insulating plates and the YIG elements are fixed at predetermined positions.

Abstract: Apparatus for separating a radio frequency (rf) ground plane from a metal housing in which a circuit board is disposed includes an rf choke and a dielectric layer for separating the housing from the circuit board.

Abstract: A customizable impedance matching network for coupling a microwave transmission line to an FET. The network includes a plurality of conductive pads formed on the first surface of a dielectric substrate each pad providing in combination with the substrate and a conductor formed on an opposite surface of the substrate, a predetermined capacitance. Selective ones of such conductive pads are interconnected in parallel to form a capacitor having a capacitance related to the total surface area of such interconnected conductive pads, to provide the requisite capacitive reactance for the network. The network further includes a strip conductor formed on such first surface having a predetermined inductance per unit length and having a first end electrically connected to the network.

Abstract: A compact power detector apparatus comprises a unique adjustable directional coupler and a power detector circuit integrated therewith. The adjustable coupler comprises a pair of stripline conductors, one of which is carried on a turntable. The coupling distance between the conductors varies as the turntable rotates. The power detector circuit is also carried on the turntable, thus avoiding the need for flexible interconnections. The output from the detector circuit is taken from a connector substantially in the center of the turntable.

Abstract: An impedance matching network for coupling a microwave transmission line to a field effect transistor (FET). The impedance matching network includes a resistor coupled in shunt with the FET and an inductor connected between the microwave transmission line and the resistor. The inductor is formed by wrapping a conductive wire around a post inserted into a hole formed in a support for the FET.

Abstract: A cell changes conductivity by electrodeposition of a metal in response to an applied voltage pulse. The cell can be used as a variable resistance device to provide a broad frequency switching or modulating device that operates to switch dc as well as microwave energy. The cell also functions as a variable reactance device.

Abstract: A one port-to-M port passive signal power divider circuit (or combiner circuit) where M>2 and .noteq. 2.sup.N, M and N are integers, includes M - 1 two-way in-phase passive power dividers having a signal delay D through each path in one or more delay devices having delay D. Each output of each two-way power divider is coupled to an input of another power divider, a delay line or an output port, the arrangement being such that the delay through all ports of the power divider are equal. In accordance with a further embodiment of the invention the outputs of a passive power divider are connected to two-way switches using active components. The switches under control of a control circuit are utilized to switch the input signal to the power divider to any one of 2.multidot.M output terminals of the switches.

Abstract: A circuit component for use with signals of superhigh frequency, on the order of 10 GHz or more, has a waveguide structure with four conductive walls defining a channel of rectangular cross-section, the channel bottom being overlain by a dielectric layer supporting at least one microstrip of copper or the like closely spaced from one of the lateral walls. The supporting layer preferably consists of a polymeric material of relatively low dielectric constant, e.g. between 2 and 3. The width and height of the channel are less than half the free-space wavelength of the highest-frequency signal to be transmitted; the circuit is tuned by metallic screws which are threaded into the adjoining wall and partly overlie the microstrip at a low level, the axes of adjacent screws being separated by less than an eighth of that wavelength.

Abstract: The two magnet structures for establishing therebetween a magnetic field for a multi-stage electromagnetically-tuned filter are provided with tapered machine screws each of which can change the separation between the structures at the point where that screw is mounted so that the pole pieces defining the magnetic field can be tilted in any direction with respect to each other while the filter is operating.

Abstract: A waveguide apparatus guides a first pair of horizontally polarized transmit and receive frequency signals independently of and in parallel with a second pair of vertically polarized transmit and receive frequency signals. The waveguide apparatus is constructed to operate across the 3.7 to 6.425 GigaHertz band with a very narrow bandwidth for the transmit frequency and a very narrow bandwidth for the receive frequency and with a single size of rectangular waveguide for separating the transmit and receive frequencies. This construction simplifies frequency separation filtering techniques and provides effective operation over this broad band with an apparatus which is efficient in terms of space, compact and implemented by a simple package.

Abstract: A directional coupler with a first and second transformer, having their primary windings connected in series, provides a sample of the current flow through the series connected primary windings. A third transformer provides a voltage sample of the voltage that results from the current flow through the primary windings of the first and second transformers. The voltage sample and the current sample are vectorially combined by a vector adder to obtain a first signal that is representative of the reflected power components of the current and voltage samples and also to provide a second signal that is representative of the forward power components of the current and voltage samples.

Abstract: A millimeter-wave phase shifter for use at high millimeter-wave frequencies is disclosed. The phase shifter employs continuous aperture ferrite and corrugated horns to make a reciprocal phase shifter in the frequency range of interest. Applied linearly polarized energy is expanded in cross-section by means of a first corrugated horn. The expanded energy is focused by a first lens, circularly polarized and applied to a ferrite phase shifting section. The phase shift applied to the energy is controlled by means of phase control circuitry and a yoke and coil arrangement. The phase-shifted energy is then converted to linearly polarized energy by a second circular polarizer focused by a second lens and contracted in cross-section by a corrugated horn. The use of the corrugated horns, polarizers, lenses and ferrite phase shifting components allows a much larger device to be fabricated and hence physical tolerances are reduced by an order of magnitude for the frequency range of interest.

Abstract: A hardwire missile receiver coupled line apparatus is inserted between the antenna output port and the receiver input in a missile communication link to allow signals to be coupled directly into the missile receiver before the missile launch. At launch, the cable to the side of the missile is pulled from the side of the missile. After the cable is pulled, the open circuited cable between the side of the missile and the coupling network does not degrade the signal transmission from the antenna to the receiver.

Abstract: A microwave detector arrangement operable over a broad range of frequencies including the series resonant frequency of a detector diode (9) for detecting microwave energy in a transmission line of characteristic impedance Z.sub.o, suitably a coplanar line. A first portion of line, including a strip conductor (3), is terminated by a network, including a capacitance (4) and a first resistance (5) in series with one another and with the parallel combination of a second resistance (6) and the diode (9). The capacitance (4) provides D.C. isolation, while the detector output is taken across a capacitance (10) in series with the diode (9). The first and second resistances (5,6) are respectively 2Z.sub.o /3 and 3Z.sub.o /2, so that the terminating impedance provides a reasonable match to the line over a broad frequency range.