Birefringent corrugated waveguide

Patent · Mon Jan 01 00:00:00 EST 1990

OSTI ID:867291

Moeller, Charles P ^[1]

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1. Del Mar, CA

A corrugated waveguide having a circular bore and noncircularly symmetric corrugations, and preferably elliptical corrugations, provides birefringence for rotation of polarization in the HE.sub.11 mode. The corrugated waveguide may be fabricated by cutting circular grooves on a lathe in a cylindrical tube or rod of aluminum of a diameter suitable for the bore of the waveguide, and then cutting an approximation to ellipses for the corrugations using a cutting radius R.sub.0 from the bore axis that is greater than the bore radius, and then making two circular cuts using a radius R.sub.1 less than R.sub.0 at centers +b and -b from the axis of the waveguide bore. Alternatively, stock for the mandrel may be formed with an elliptical transverse cross section, and then only the circular grooves need be cut on a lathe, leaving elliptical corrugations between the grooves. In either case, the mandrel is first electroplated and then dissolved leaving a corrugated waveguide with noncircularly symmetric corrugations. A transition waveguide is used that gradually varies from circular to elliptical corrugations to couple a circularly corrugated waveguide to an elliptically corrugated waveguide.

• Research Organization: CALIFORNIA INSTITUTE OF TECH
• DOE Contract Number: AC03-84ER51044
• Assignee: United States Department of Energy (Washington, DC)
• Patent Number(s): US 4906951
• OSTI ID: 867291
• Country of Publication: United States
• Language: English

Related Subjects

birefringent
corrugated
waveguide
circular
bore
noncircularly
symmetric
corrugations
preferably
elliptical
provides
birefringence
rotation
polarization
11
mode
fabricated
cutting
grooves
lathe
cylindrical
tube
rod
aluminum
diameter
suitable
approximation
ellipses
radius
axis
cuts
centers
-b
alternatively
stock
mandrel
formed
transverse
section
cut
leaving
electroplated
dissolved
transition
gradually
varies
couple
circularly
elliptically
corrugated waveguide
circular bore
circular groove
cylindrical tube
/333/