Wave transmission lines and networks – Coupling networks – Delay lines including elastic bulk wave propagation means
Patent
1982-11-22
1984-08-14
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Delay lines including elastic bulk wave propagation means
310 26, 333149, 364823, H03H 930, H01P 900
Patent
active
044659865
ABSTRACT:
A magnetostatic wave device which has broad application in the signal processing arena is disclosed herein. Basically, the magnetostatic wave device includes a layer of magnetized magnetic medium having a surface which includes a prespecified area to support the propagation of magnetostatic waves. A generator element is disposed at one end of the propagation area and is operative to carry an electromagnetic signal to generate magnetostatic waves supported by the propagation area. A pattern of conductive material having a plurality of conductive paths commonly coupled together at both ends is disposed in juxtaposition with the propagation area of the magnetic medium surface. In one embodiment, the conductive pattern includes a variable impedance coupled to each of a desired number of the conductive paths thereof to vary the impedance of the path. Each variable impedance is adjustable controlled in accordance with an applied governing signal. A receiver element is disposed at the other end of the propagation area and is operative to receive the propagated magnetostatic waves and render an output electromagnetic signal. More specifically, the pattern of conductive paths may include a planar array of a plurality of metallic strips disposed in juxtaposition with the propagation area of the magnetic medium surface and aligned in a substantially parallel array with spacings of no more than half a wavelength of the propagated magnetostatic wave apart. The parallel array alignment is transverse to the propagation path of the magnetostatic wave.
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Emtage Peter R.
Loh Koon W.
Nussbaum Marvin L.
Westinghouse Electric Corp.
Zitelli W. E.
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