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| Metallic glass powders from glassy alloys |
| OF THE INVENTION Metallic glass alloy powders are prepared according to a process involving first ... |
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| Embrittling of glass alloys by hydrogen charging |
| OF THE INVENTION Metallic glass alloy powders are prepared according to a process involving first ... |
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| Process for the production of titanium-based alloy members by powder metallurgy |
| What is claimed is: 1. A process for the production of titanium based alloy members, comprising: (a)... |
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| Amorphous alloys for magnetic head core and video magnetic head using same |
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| Magnetic head and method of producing same |
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| Amorphous alloys containing iron group elements and zirconium and articles made of said alloys |
| We claim: 1. Amorphous alloys containing iron group elements and zirconium and having the ... |
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| Amorphous alloys |
| We claim: 1. Amorphous metal alloys having a composition shown by the following formula T.sub.a X.... |
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| Transferable paint film and method for its manufacture |
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Apparatus for circularly polarized radiation from surface wave transmission line
| Details |
Inventors: Svy, Kosal;
Assignee: The Boeing Company (Seattle, WA)
Primary Examiner: Sikes; William L.
Assistant Examiner: Johnson; Doris J.
Attorney, Agent or Firm: Christensen, O'Connor, Johnson & Kindness
Disclosed is an arrangement of two conical radiators that electromagnetically interact with one another to produce circularly polarized radiation in a surface wave transmission system. One of the radiators includes an annular conductive region that coaxially surrounds the surface wave transmission line with a pair of spiral antenna arms extending outwardly along the conical surface of the radiator from oppositely disposed positions on the outer boundary of the annular conductive region. The second radiator, which is spaced apart from the first radiator, includes a circular conductive region to which the end of the surface wave transmission line is joined and further includes a pair of spiral antenna arms that extend outwardly along the surface of the second conical radiator. The annular opening in the first radiator is dimensioned so that one-half of the surface wave energy incident on the first radiator is radiated and the remaining one-half of the electromagnetic energy propagates through the circular opening of the annular conductive region and is radiated by the second radiator. The orientation between the first and second radiators is established both with respect to axial distance between the radiators and the spatial position of the inner ends of the spiral antenna arms to cause the individual signals radiated by the two radiators to combine in a manner that results in far field circular polarization. |
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DETAILED DESCRIPTION With reference to FIG.
1, in one type of RF transmission and radiation system that can advantageously employ the invention, a surface wave transmission line 10 is extended rearwardly from an aircraft 12.
In this arrangement, an RF transmitter that is located within aircraft 12 (not shown in FIG.
1) couples the electromagnetic energy to be radiated by the system to a launcher 14 which is located at the forward end of surface wave transmission line 10 (i.
e.
, adjacent the tail section of the aircraft 12).
Launcher 14 serves as an interface between the transmission medium of the RF aircraft transmission system (e.
g.
, coaxial cable or waveguide) and the surface wave transmission line.
Various arrangements are known in the art that can be employed as launcher 14 of FIG.
1.
For example, one such device is disclosed and claimed in co-pending U.
S.
patent application Ser.
No.
913,774, now U.
S.
Pat.
No.
4,730,172 filed Sept.
30, 1986 by G.
A.
Bengeult, which is entitled "Launcher For Surface Wave Transmission Lines," and is assigned to the assignee of this invention.
Regardless of the exact configuration of launcher 14, the launcher causes RF energy supplied by the aircraft transmission system to be coupled onto the surface wave transmission line 10 as a traveling "bundle" of wave energy.
In this regard, as is known to those familiar with surface wave transmission lines, coating the outer surface of a conductive wire with low-loss dielectric machining grooves and/or crimping the wire establishes a transmission environment in which the phase velocity of the electromagnetic signal traveling along the wire is less than the free space phase velocity of that signal.
This, in turn, confines the electromagnetic field to a cylindrical region in space ("energy tube") that concentrically surrounds the wire.
Such region being indicated in FIG.
1 and 2 by phantom lines 16.
As is indicated in FIG.
2 by the dashed arrows 18, the electric field vectors (E vectors) of the electromagnetic field that surrounds the surface wave transmission line are perpendicular to the transmission line and extend radially between the outer diameter of the energy tube 16 and surface wave transmission line 10
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