Accession Number : AD0276845

Title :   LOW FREQUENCY GYRATOR DEVELOPMENT

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s) : CURRAN,D.R. ; SILVERMAN,J.H.

Report Date : 31 JAN 1962

Pagination or Media Count : 1

Abstract : Two electromechanical (em) gyrator designs, with coupled piezoelectric and piezomagnetic transducers, were used to cover the frequency range from 375 cps to 1.1 Mc, with bandwidths from 1.0 to 3.7% and power insertion losses below 2 db except at the extreme ends of the range. By combining piezoelectric and piezomagnetic transducers with complementary frequency-temperature dependencies, em gyrators were obtained with characteristics stable within ! 0.1% over the -40 to + 100 C range. Neutralization of em gyrators to form isolators was accomplished by adding appropriate reciprocal networks in parallel with the em gyrator to cancel one of its transfer admittances at one or more frequencies. Stop direction characteristics, ranging from a single notch of high rejection to those of broadband isolators with 20 db of isolation over the 9% bandwidth of the pass direction, were obtained with forward power insertion losses of 1 to 3 db. The em gyrator can also form an effective 3 channel circulator. Low frequency Hall effect gyrators have been investigated as multiterminal devices. (Author)

Descriptors :   *ELECTROMECHANICAL CONVERTERS, *MAGNETOSTRICTIVE ELEMENTS, *PIEZOELECTRIC TRANSDUCERS, *TRANSDUCERS, *TRANSMISSION LINES, BROADBAND, CERAMIC MATERIALS, CIRCUITS, COUPLING CIRCUITS, ELECTRIC FIELDS, ELECTRICAL NETWORKS, FERROELECTRIC MATERIALS, FERROMAGNETIC MATERIALS, HALL EFFECT, MAGNETIC FIELDS, MAGNETOOPTICS, MATHEMATICAL ANALYSIS, MATRICES(MATHEMATICS), MICROWAVE NETWORKS, PHASE SHIFT CIRCUITS, PIEZOELECTRIC CRYSTALS, SYNTHESIS, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE