Quasi-optical waveguide filter
First Claim
Patent Images
1. A quasi-optical waveguide filter, comprising:
- a waveguide section, having an axis of energy propagation, and including means for coupling said section to other elements of a waveguide system;
a plurality of gratings installed in said waveguide section at uniform intervals along the axis of propagation and substantially perpendicular to it, each of said gratings having a pattern of conductive strips formed on an insulating layer, the pattern conforming to the contours of a selected waveguide mode, whereby each of said gratings is operative to selectively transmit a first wave in the selected waveguide mode, linearly polarized in a direction parallel with the strip pattern on a first one of said gratings, and a second wave in the selected waveguide mode, linearly polarized in a direction perpendicular to the first wave;
wherein the angular orientation of the first of said gratings is aligned with the direction of linear polarization with the first wave and the angular orientations of said gratings with respect to each other are selected to provide a selected frequency characteristic to said filter.
2 Assignments
0 Petitions
Accused Products
Abstract
A waveguide filter particularly well suited for use in the millimeter and submillimeter wavelength range of the spectrum. The filter includes a number of uniformly spaced gratings installed in a waveguide section and having grating strip patterns contoured to conform with a selected waveguide mode, such as the circular TE11 mode. The gratings are angularly oriented in the manner of a free-space plane-wave quasi-optical filter and provide similar desired frequency characteristics, but without the disadvantages of large size and the need for planewave launchers.
-
Citations
11 Claims
-
1. A quasi-optical waveguide filter, comprising:
-
a waveguide section, having an axis of energy propagation, and including means for coupling said section to other elements of a waveguide system; a plurality of gratings installed in said waveguide section at uniform intervals along the axis of propagation and substantially perpendicular to it, each of said gratings having a pattern of conductive strips formed on an insulating layer, the pattern conforming to the contours of a selected waveguide mode, whereby each of said gratings is operative to selectively transmit a first wave in the selected waveguide mode, linearly polarized in a direction parallel with the strip pattern on a first one of said gratings, and a second wave in the selected waveguide mode, linearly polarized in a direction perpendicular to the first wave; wherein the angular orientation of the first of said gratings is aligned with the direction of linear polarization with the first wave and the angular orientations of said gratings with respect to each other are selected to provide a selected frequency characteristic to said filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A quasi-optical waveguide filter, comprising:
-
a waveguide section having a longitudinal center axis extending therethrough; and a plurality of gratings installed in said waveguide section at uniform intervals along said longitudinal axis and extending transversely with respect to said longitudinal axis, each of said gratings having a conductive layer which is patterned in accordance with the contours of a selected waveguide mode, and each of said gratings is operative to selectively transmit a first wave in the selected waveguide mode, linearly polarized in a direction parallel with the strip pattern on a first one of said gratings, and a second wave in the selected waveguide mode, linearly polarized in a direction perpendicular to the first wave; and wherein the angular orientation of the conductive layer contours on each of said gratings about said longitudinal axis corresponds to a selected bandwidth of said filter, and said uniform intervals are directly proportional to the wavelength corresponding to a selected center frequency of the filter. - View Dependent Claims (10, 11)
-
Specification