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Double pane microwave window
| Details |
Inventors: Miller, Curtis G.;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Loney; Donald J.
Assistant Examiner:
Attorney, Agent or Firm: Gudmestad; Terje, Denson-Low; W. K.
A window has two plates of radiation-propagative material, such as two plates of glass or two films of transparent dimensionally-stable plastic which serve as window panes through which electromagnetic radiation can propagate. The panes are spaced apart by one quarter wavelength of the radiation by a spacer block to provide for cancellation of any reflected wave. The window is readily disassembled to permit replacement of the spacer block to increase or to decrease the spacing as may be required to adjust the window for a different frequency band of radiation. Also, the construction of the window permits its mounting within the aperture of a wall, and to serve for joining two waveguides, thereby, to facilitate use of the window in the conduct of tests in a laboratory. The spacer block with the transparent plates thereon are positioned between a base and a cap, both of which are configured for attachment to waveguides. The base and the spacer block and the cap are provided with openings arranged coaxially and through which radiant energy propagates. A set of bolts and alignment pins extend through the window components for facile assembly and disassembly. |
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DETAILED DESCRIPTION The aforementioned problems are overcome and other advantages are provided by a window which, in accordance with the invention, has two plates of radiation-propagative material, such as two plates of glass or two films of transparent dimensionally-stable plastic which serve as window panes through which electromagnetic radiation can propagate.
The panes are spaced apart by one quarter wavelength of the radiation, or an odd integral number of one quarter wavelengths of the radiation, to provide for cancellation of any reflected wave.
A spacer block is located between the two panes to provide for the requisite spacing, and the window is readily disassembled to permit replacement of the spacer block to increase or to decrease the spacing as may be required to adjust the window for a different frequency band of radiation.
Also, the construction of the window permits its mounting within the aperture of a wall, and to serve for joining two waveguides, thereby, to facilitate use of the window in the conduct of tests in a laboratory.
In accordance with a preferred embodiment of the invention, wherein the window may be secured to wall of a vacuum chamber enclosing satellite electronics or other devices under test, the window comprises a base secured to the wall, the base extending across an aperture in the wall and having a first opening overlying at least a part of the aperture.
In addition, there is provided the aforementioned spacer block having opposed front and back surfaces and a second opening extending from the front surface to the back surface.
The panes of transparent material are disposed as a front plate and a back plate located respectively on the front and the back surfaces of the spacer block, each of the plates extending across the second opening.
Finally, there is provided a cap having a third opening, wherein the spacer block is located between the base and the cap, the first and the second and the third openings being coaxial, and the front plate abutting the base and the back plate abutting the cap
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