Abstract: An antenna comprises: a first set of two subarrays and a second set of two subarrays, where each subarray comprises: a set of antenna elements; a set of shunt waveguides, where each shunt waveguide is coupled to a unique subset of antenna elements; and a series waveguide coupled to each shunt waveguide of the set of shunt waveguides; wherein all of the series waveguides are substantially parallel; wherein each subarray of the first set is interleaved with a unique subarray of the second set so as to form first interleaved subarrays and second interleaved subarrays; wherein the first interleaved subarrays and the second interleaved subarrays are adjacent; and wherein the series waveguides of the second set are disposed within the series waveguides of the first set without any interceding series waveguides.

Abstract: An antenna comprises: a first set of two subarrays and a second set of two subarrays, where each subarray comprises: a set of antenna elements; a set of shunt waveguides, where each shunt waveguide is coupled to a unique subset of antenna elements; and a series waveguide coupled to each shunt waveguide of the set of shunt waveguides; wherein all of the series waveguides are substantially parallel; wherein each subarray of the first set is interleaved with a unique subarray of the second set so as to form first interleaved subarrays and second interleaved subarrays; wherein the first interleaved subarrays and the second interleaved subarrays are adjacent; and wherein the series waveguides of the second set are disposed within the series waveguides of the first set without any interceding series waveguides.

Abstract: Systems and methods for mode suppression in a cavity are provided. In certain implementations, an apparatus comprises a cavity for propagating electromagnetic signals therein, wherein the electromagnetic signals propagate multiple times through the cavity; and an absorbing material applied to a first side of the cavity, wherein the absorbing material absorbs the electromagnetic signals. Further, an apparatus includes at least one transmitting antenna configured to couple electromagnetic energy into the cavity; and at least one receiving antenna configured to couple electromagnetic energy from the cavity.

Abstract: Systems and methods for an antenna conformal to a sphere are provided. In certain implementations, an apparatus comprises a sphere having a recessed portion formed therein, the sphere enclosing instrumentation that produces a transmittable electronic signal; central conductor placed within the recessed portion, wherein the central conductor is coupled to the instrumentation to receive the transmittable electronic signal, wherein the transmittable electronic signal is emitted outside of the sphere; and an insulator cap located over the recessed portion, wherein locations on the external surface of the insulator cap and an external facing surface of the central conductor are substantially equidistant from a center point of the sphere.

Abstract: Systems and methods for mode suppression in a cavity are provided. In certain implementations, an apparatus comprises a cavity for propagating electromagnetic signals therein, wherein the electromagnetic signals propagate multiple times through the cavity; and an absorbing material applied to a first side of the cavity, wherein the absorbing material absorbs the electromagnetic signals. Further, an apparatus includes at least one transmitting antenna configured to couple electromagnetic energy into the cavity; and at least one receiving antenna configured to couple electromagnetic energy from the cavity.

Abstract: Systems and methods for an antenna conformal to a sphere are provided. In certain implementations, an apparatus comprises a sphere having a recessed portion formed therein, the sphere enclosing instrumentation that produces a transmittable electronic signal; central conductor placed within the recessed portion, wherein the central conductor is coupled to the instrumentation to receive the transmittable electronic signal, wherein the transmittable electronic signal is emitted outside of the sphere; and an insulator cap located over the recessed portion, wherein locations on the external surface of the insulator cap and an external facing surface of the central conductor are substantially equidistant from a center point of the sphere.

Abstract: An antenna feed with mode suppression includes a transition section, having a window for connecting to an output port of a waveguide and having inner and outer conductors forming a coaxial waveguide that couples energy from the waveguide into a horizontal TE11 mode in the coaxial waveguide. A polarizer section is coupled to the transition section and generates circular polarization from the horizontal mode of the transition section. A radiator section is coupled to the polarizer and provides an output signal for the antenna feed. The transition section includes an electrical short coupling the inner and outer conductors. The electrical short is disposed adjacent to the window of the transition section. A dielectric block is also disposed between the inner and outer conductors and adjacent to the electrical short along the axis of the coaxial waveguide. A surface of the dielectric block is coated with a thin film sheet resistance.

Abstract: A concentric feed is provided. The concentric feed includes an outer-conductive tube electrically connected at a base of an inner-conductive tube to an outer-conductive tube by a process comprising the steps of: configuring the outer-conductive tube; configuring the inner-conductive tube; and positioning the outer-conductive tube to contact the inner-conductive tube at the base. The outer-conductive tube is configured to include: a side-port; a first-edge surface; a first-interior surface sharing an edge with and perpendicular to the first-edge surface; a second-edge surface; and a second-interior surface sharing an edge with and perpendicular to the second-edge surface. The inner-conductive tube is configured to include: the base at a base-end of the inner-conductive tube, the base including a first lip and a second lip protruding orthogonal to a first surface and a second surface, respectively, and a central-port centered on the central axis and parallel to the central axis; and a main-body.

Abstract: A waveguide-configuration adapter is provided. The waveguide-configuration adapter includes a horizontal waveguide and a vertical waveguide. The horizontal waveguide includes a first-interface port spanning a first X-Y plane and a first-coupling port spanning a Y-Z plane with a first-coupling-port width parallel to the y axis. The vertical waveguide includes a second-interface port spanning a second X-Y plane and a second-coupling port spanning a third X-Y plane with a second-coupling-port width parallel to the x axis. When an E-field is input at the first/second coupling port in the plane of the first/second coupling port, respectively, and oriented perpendicular to the first/second coupling-port width, respectively, the E-field is output from the second/first coupling port, respectively, in the plane of second/first coupling port, respectively, and oriented perpendicular to the second/first coupling-port width, respectively.

Abstract: A concentric feed is provided. The concentric feed includes an outer-conductive tube electrically connected at a base of an inner-conductive tube to an outer-conductive tube by a process comprising the steps of: configuring the outer-conductive tube; configuring the inner-conductive tube; and positioning the outer-conductive tube to contact the inner-conductive tube at the base. The outer-conductive tube is configured to include: a side-port; a first-edge surface; a first-interior surface sharing an edge with and perpendicular to the first-edge surface; a second-edge surface; and a second-interior surface sharing an edge with and perpendicular to the second-edge surface. The inner-conductive tube is configured to include: the base at a base-end of the inner-conductive tube, the base including a first lip and a second lip protruding orthogonal to a first surface and a second surface, respectively, and a central-port centered on the central axis and parallel to the central axis; and a main-body.

Abstract: An antenna feed with mode suppression includes a transition section, having a window for connecting to an output port of a waveguide and having inner and outer conductors forming a coaxial waveguide that couples energy from the waveguide into a horizontal TE11 mode in the coaxial waveguide. A polarizer section is coupled to the transition section and generates circular polarization from the horizontal mode of the transition section. A radiator section is coupled to the polarizer and provides an output signal for the antenna feed. The transition section includes an electrical short coupling the inner and outer conductors. The electrical short is disposed adjacent to the window of the transition section. A dielectric block is also disposed between the inner and outer conductors and adjacent to the electrical short along the axis of the coaxial waveguide. A surface of the dielectric block is coated with a thin film sheet resistance.

Abstract: A waveguide-configuration adapter is provided. The waveguide-configuration adapter includes a horizontal waveguide and a vertical waveguide. The horizontal waveguide includes a first-interface port spanning a first X-Y plane and a first-coupling port spanning a Y-Z plane with a first-coupling-port width parallel to the y axis. The vertical waveguide includes a second-interface port spanning a second X-Y plane and a second-coupling port spanning a third X-Y plane with a second-coupling-port width parallel to the x axis. When an E-field is input at the first/second coupling port in the plane of the first/second coupling port, respectively, and oriented perpendicular to the first/second coupling-port width, respectively, the E-field is output from the second/first coupling port, respectively, in the plane of second/first coupling port, respectively, and oriented perpendicular to the second/first coupling-port width, respectively.