Abstract:
In contrast to prior art delay devices using a piezoelectric crystal, wherein the input and output transducers are conductors applied to the piezoelectric crystal, the invention provides for at least one of these transducers (e.g., 123 in FIGS. 2, 3 and 5) to be partly made up of a system of regions (30) of an insulator (10) covering the crystal (2) and which are rendered conductive when bombarded by an electron beam (from gun 20). The invention will find application in the production of variable delays, and in particular to pulse compression and filtering.
Abstract:
A device for storing high frequency signals. High frequency electrical signals to be stored are applied to a piezoelectric delay line, where they are transduced into an acoustical wave traveling along a surface of the delay line. An electron beam sweeps this surface and interacts with the line and the wave stimulating emission of secondary electrons which form an electrostatic image of the acoustical waves along this surface, thereby recording the signal or wave. Read out is accomplished by a subsequent beam sweep of the surface. The beam write and readout sweeps may be identical, or different in time, direction, or variable, to compress/expand, reverse, or modulate the signal when read-out.
Abstract:
A memory device including a piezoelectric delay line along the surface of which travels acoustic waves to be put into memory; an electron gun which sweeps the work surface of the line with a beam of electrons for recording or reading out the wave; and in which this work surface is covered at least in part by a layer of a highly resistive material.
Abstract:
A ''''ring and bar'''' type of delay line has rings formed by plates connected by metal tubes 5 through which a coolant liquid, having good dielectric properties, is caused to flow. The rings are supported on dielectric blocks which have good thermal conductivity and through which the coolant liquid is caused to circulate.
Abstract:
In a delay line of an electron tube for amplifying or generating microwaves, externally of and parallel to a main conductor helix within which an electron beam travels axially, there extends a secondary helix which has a pitch and a diameter half the size of those of the main helix and which is so arranged that its turns electrically contact those of the main helix at several locations along a generatrix common to both helices. The field effect generated by the secondary helix substantially diminishes parasitic phenomena that appear in a delay line having a main helix of large diameter.
Abstract:
An electromechanical directional coupler for high-frequency waves. Couplers of this kind comprise an input transducer and a number of output transducers disposed on a piezoelectric member in the path of the wave, and a number of conductive strips between the first transducer and the other transducers, so as to distribute among the output transducers the energy of the wave applied to the input transducer. According to the invention, the strips are obtained by conductivity induced by a beam of electrons which bombards the piezoelectric member or an electrically insulating member which covers member. The same device operates at various frequencies, the coupling ratios between the input transducer and the output transducers being adjustable. General application to high-frequency directional coupling.
Abstract:
A piezoelectric substrate (1) exhibiting sufficient electric isolation is equipped at its both ends with an input transducer (2) and an output transducer (3). There is formed a permanent electrostatic image of the acoustic wave induced at the surface of substrate (1) by a given high frequency signal applied at the input transducer, by means of an electron beam (4), deflected toward the substrate so as to impinge on the the zone covered by the acoustic wave. Readout of this image is obtained by a second electron bombardment. Deflection of the beam (50) is achieved by means of a difference in potential applied between the electrode (5) and elements (60, 61, 62 . . . ). The device enables a train of signals applied at the input transducer to be addressed and coded.
Abstract:
This asymmetrical interdigital delay line is constituted by two combs of triangular interleaved fingers of different dimensions, with the fingers of one comb provided near their extremities with a hole, while those of the other comb are provided near their tips with a tube of a width larger than the thickness of the fingers, the axis of the tube coinciding with the axis of the holes and that of the beam passing through the delay line in operation, this structure bringing the advantages of direct fundamental mode operation and good heat dissipation.