Showing papers on "Balun published in 1973"

Stripline slotted balun dipole antenna

Abstract: A stripline slotted balun dipole antenna, suitable for use as a single antenna or as an array antenna element, is fabricated from two metal-clad dielectric sheets, from which metal has been removed in predetermined patterns, and then the sheets are sandwiched together to form both the slotted balun dipole antenna and its stripline feed. The metal remaining on the exterior of the laminated structure constitutes a slotted balun dipole and the metal remaining between the dielectric sheets constitutes the center conductor of the stripline feed. The structure obviates the need for metallic connections in the antenna area.

Transmission line balun

Abstract: A flexible printed transmission line balun is disclosed to replace the coaxial cable and relatively expensive hand wound balun coil currently used in TV receivers The present transmission line balun includes a first circuit disposed on one side of a flexible insulator substrate and a second circuit disposed on the opposite side of the substrate Both circuits are formed on the substrate by conventional means which include etching and printing techniques

R. f. impedance bridge for measuring reflection coefficient

Abstract: A bridge for measuring the reflection coefficient of a twoterminal load, in which the insertion loss between an input port and an output port is proportional to the reflection coefficient of the load connected to a third port, and the constant of proportionality is substantially independent of frequency; includes a balun, a first two-terminal network connected in one arm of the bridge, a second two-terminal network connected in the opposite arm of the bridge, and a resistance equal to the reference resistance in the arm opposite the port to which the load is connected. The impedance of the second network is the inverse, relative to the reference resistance, of the parallel combination of the first network and the additional impedance to ground caused by the connection of the balun.

Image recovery receiver

Abstract: An image recovery mixer system comprising two double balanced mixers each of the diode bridge type and having one set of opposing diagonals of one bridge interconnected with one set of opposing diagonals of the other set, thereby cancelling the image frequency signal directly between the diode mixers. The input RF signal can then be applied in phase to both mixers by means of a transformer or balun.

Traffic detector using balun transformer phase detector

Abstract: A traffic detector is disclosed in which an output is produced when a metal object is in proximity to a coil implanted in a roadway. The coil is part of a resonant sensing circuit and is excited by the same oscillator that excites a resonant reference circuit. The phase change between the two circuits caused by the presence of an object near the coil is passed by a balun transformer phase detector and fed to a level detector which produces an output when a predetermined signal threshold is exceeded.

Coplanar Balun Circuits for GaAs FET High-Power Push-Pull Amplifiers

Abstract: Three-strip coplanar balun circuits have been designed and fabricated for the push-pull operation of high-power amplifiers using GaAs Schottky-barrier FETs. Theoretical and measured properties of the balun and amplifier results are-presented.

Chebyshev quarter-wave stepped balun transformer

Abstract: The design of a balun transformer from coaxial to open-wire line is presented, in which conventional quarter-wave-matching theory is used to produce a compact device with optimal Chebyshev performance over its passband. Included in the design are the evaluation and corrections for the junction capacitances caused by stepping the outer coaxial conductor.

A Wide Band Current Monitor Based on Pulsed Transformer Techniques

Abstract: A charged-particle beam current monitor has been designed using a coaxial cable transmission line in a configuration similar to that employed in building toroidal-wound wide band impedance matching and balun transformers. Several sizes of the coax-wound monitors have been constructed and compared with units of similar ferrite core material and geometry that were wound with ordinary magnet wire. One of the transformers has been used by experimenters at the NAL Internal Tarqet area since August of 1972. In order to simplify electronic signal processing, only average circulating charge is measured. This is done by measuring the "zero"signal" base-line shift due to the natural L/R response of the transformer.