Abstract:
Provided are a slow wave circuit and a traveling wave tube suitable for an increase in fineness with regard to processing beam holes, and suitable for higher frequencies. A slow wave circuit (10) includes a meandering waveguide (1) and a beam hole (2) that pierces the meandering waveguide (1), and the cross-section of the beam hole (2) in the direction orthogonal to the long direction is in the shape of a polygon having a larger number of sides than a quadrilateral.
Abstract:
A bleed channel electronic component package includes a substrate having an upper solder mask. To mount an electronic component to the substrate, an inactive surface of the electronic component is placed into an adhesive on the substrate. As the adhesive is squeezed between the electronic component and the upper solder mask, the adhesive bleeds laterally outwards past sides of the electronic component. However, bleed channels are formed in the upper solder mask directly adjacent and around the electronic component. Thus, the adhesive bleed flows into the bleed channels, and is captured therein. In this manner, the lateral spread of the adhesive bleed is minimized.
Abstract:
A variable pitch delay line for a travelling wave tube, is constituted by cells constructed in waveguide sections in which takes place the propagation of the electromagnetic waves which are used in the operation of the tube. All the cells are constituted by the same components, namely tops or covers, a ring, supporting rods for the ring and a short-circuit. The variable pitch is obtained by expansion or contraction of the dimensions within the guide cross-section. A significant improvement of the tube efficiency is obtained by the use of lines formed from three sections with different pitches, which succeed one another along the path of the beam, whereof the second section has a smaller pitch and the third section a larger pitch than the first section.
Abstract:
A delay line for traveling wave tubes comprises a rectangular wave guide having cross members which perpendicularly protrude into the wave guide interior extending alternately from two sides facing each other of a first pair of inner wave guide walls. The wave guide inner wall includes a recess extending in the longitudinal direction of the wave guide and disposed symmetrically at both sides of the longitudinal extension of the cross members, at least in the area of their ends. Such a delay line construction provides for the provision of a magnet surrounding the line which may have a comparably small inside diameter.
Abstract:
An interdigital delay line for crossed field tubes has vanes extending from their interaction faces to a back wall. One end of each vane extends to the end of the face. The other end is cut out behind the interaction face leaving the face projecting. The interaction impedance is almost as high as that of a line with fingers supported by stubs at their centers, while the thermal dissipation is higher, approaching that of a line with vanes extending over the entire length of the fingers.
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.