Abstract: A linear-to-circular polarizer includes a meanderline polarizer having a plurality of meanderline conductor patterns, and a gridline polarizer having a plurality of conductors arranged in a grid pattern. The gridline polarizer is spaced apart from the meanderline polarizer by a first prescribed distance and the gridline polarizer is spaced apart from a planar antenna aperture of a planar antenna by a second prescribed distance.

Abstract: A linear-to-circular polarizer includes a meanderline polarizer having a plurality of meanderline conductor patterns, and a gridline polarizer having a plurality of conductors arranged in a grid pattern. The gridline polarizer is spaced apart from the meanderline polarizer by a first prescribed distance and the gridline polarizer is spaced apart from a planar antenna aperture of a planar antenna by a second prescribed distance.

Abstract: An antenna includes an aperture defining a feed area of the antenna, the aperture divided into a plurality of discrete subarrays, and a feed network having an input port, a plurality of output ports, and a plurality of conductors, each conductor connected between the input port and a respective output port the plurality of output ports, and each output port of the plurality of output ports connected to a respective subarray of the plurality of subarrays. A line length of one conductor of the plurality of conductors is different from a line length of another conductor of the plurality of conductors to introduce different time delays between the input port and the respective output ports.

Abstract: An antenna includes an aperture defining a feed area of the antenna, the aperture divided into a plurality of discrete subarrays, and a feed network having an input port, a plurality of output ports, and a plurality of conductors, each conductor connected between the input port and a respective output port the plurality of output ports, and each output port of the plurality of output ports connected to a respective subarray of the plurality of subarrays. A line length of one conductor of the plurality of conductors is different from a line length of another conductor of the plurality of conductors to introduce different time delays between the input port and the respective output ports.

Abstract: A radio frequency (RF) device includes an RF transmission line structure having opposing boundary walls with a non-rectilinear form factor, and a feed structure configured to introduce RF energy into an area between the opposing boundary walls to illuminate the RF transmission line structure with the RF energy across the non-rectilinear form factor. The feed structure includes a plurality of traveling-waveguide-fed leaky line-segment structures, each configured to launch the RF energy into the area with a propagation direction having an oblique angle relative to an axis of the line-segment structure.

Abstract: A waveguide to parallel-plate transition is provided which includes a waveguide, an E-plane waveguide bend, an H-plane waveguide bend and a parallel-plate transmission line arranged in sequence. The E-plane waveguide bend is configured to bend a direction of a radio frequency (RF) field between the waveguide and the H-plane waveguide bend by approximately 90 degrees in an E-plane. The H-plane waveguide bend is configured to bend a direction the RF field between the E-plane waveguide bend and the parallel-plate transmission line by approximately 90 degrees in an H-plane, and the parallel-plate transmission line includes a slot through which the RF field can flow between the H-plane waveguide bend and the parallel-plate transmission line.

Abstract: A radio frequency (RF) device includes an RF transmission line structure having opposing boundary walls with a non-rectilinear form factor, and a feed structure configured to introduce RF energy into an area between the opposing boundary walls to illuminate the RF transmission line structure with the RF energy across the non-rectilinear form factor. The feed structure includes a plurality of traveling-waveguide-fed leaky line-segment structures, each configured to launch the RF energy into the area with a propagation direction having an oblique angle relative to an axis of the line-segment structure.

Abstract: An antenna array employing continuous transverse stubs as radiating elements is disclosed. In an exemplary embodiment, the array includes an upper conductive plate structure comprising a set of continuous transverse stubs, and a lower conductive plate structure disposed in a spaced relationship relative to the upper plate structure. A rotation apparatus provides rotation between the upper plate structure and the lower plate structure.

Abstract: An antenna array employing continuous transverse stubs as radiating elements is disclosed. In an exemplary embodiment, the array includes an upper conductive plate structure comprising a set of continuous transverse stubs, and a lower conductive plate structure disposed in a spaced relationship relative to the upper plate structure. A rotation apparatus provides rotation between the upper plate structure and the lower plate structure.

Abstract: A polyrod antenna fed at an end by a flared notch antenna. The space required to feed the polyrod is reduced, and a broader operating bandwidth is achieved. Gain of the antenna can be increased by increasing the polyrod length. A number of the polyrod antennas can be packed together in an array configuration.

Abstract: A planar array antenna having a switching matrix that couples an RF signal to two distributed ferrite scanning line feeds that feed a planar continuous transverse stub array antenna. The scanning line feeds couple RF energy to the antenna from opposite sides to form a total of four beams offset in space that each cover different angular scan sectors. The antenna has reduced complexity and lower design and production costs. The use of dual ferrite scanning line feeds, the switching matrix, and the continuous transverse stub antenna to obtain wide-angle scanning provides significantly improved performance. The present invention uses the two distributed ferrite scanning line feeds to obtain greater scan coverage at upper millimeter-wave frequencies, where realizable ferrite materials are less active and provide diminished scan capability. The scanning line feeds and planar array antenna may be designed so that the four scan sectors are contiguous, to increase the angular scan coverage of the antenna.