An assembly for a radio frequency filter includes: an elongate pedestal with an upper surface; a resonator; a tuning member that is positioned above the resonator; and a screw that mounts the resonator to the upper surface of the pedestal, the screw including a shank with a thread and a head, the head including a plurality of recesses configured to receive a tool, the recesses extending through the head.

A radar system is described herein. The radar system includes a printed circuit board (PCB) that includes a metallized top layer and a substrate layer that is adjacent the metallized top layer. The substrate layer includes a substrate integrated waveguide (SIW), and the metallized layer has a slotted taper etched therein. The slotted taper is positioned relative to the SIW such that an electromagnetic signal generated by a monolithic microwave integrated circuit (MMIC) passes from the slotted taper to the SIW without an intervening microstrip line. The radar system further includes a housing that acts both to disperse heat and to suppress undesired electromagnetic radiation.

A multi-layer signal filter includes at least three physical layers. Each layer has through going apertures arranged with an offset to apertures of at least one adjoining layer, each layer further has a filter channel opening for receiving signals to be filtered. The apertures are arranged along a perimeter outside the filter channel opening and the apertures are arranged with a central surface portion increasing the edge length of the aperture.

A multi-layer signal filter includes at least three physical layers. Each layer has through going apertures arranged with an offset to apertures of at least one adjoining layer, each layer further has a filter channel opening for receiving signals to be filtered. The apertures are arranged along a perimeter outside the filter channel opening and the apertures are arranged with a central surface portion increasing the edge length of the aperture.

An antenna system according to an embodiment of the present disclosure includes an antenna unit and a metal cavity corresponding to the antenna unit. The metal cavity is grounded and provided with an opening connected with the outside. By introducing the metal cavity, an embodiment of the present invention solves the problem of multi-band mutual coupling caused by a common ground current by using the cavity filter structure with a small size.

An antenna system according to an embodiment of the present disclosure includes an antenna unit and a metal cavity corresponding to the antenna unit. The metal cavity is grounded and provided with an opening connected with the outside. By introducing the metal cavity, an embodiment of the present invention solves the problem of multi-band mutual coupling caused by a common ground current by using the cavity filter structure with a small size.

Waveguide filters comprising ridges disposed within a waveguide cavity for selecting electromagnetic signals within a frequency passband. An apparatus includes a waveguide filter comprising a waveguide cavity and a plurality of ridges disposed within the waveguide cavity. The apparatus is such that each of the plurality of ridges comprises a first side and a second side, and wherein the first side and the second side are disposed at a non-orthogonal angle relative to one other. The apparatus is optimized for fabrication using metal additive manufacturing techniques.

Microwave antenna systems include a parabolic reflector antenna and a dual-band feed assembly. The dual-band feed assembly includes a coaxial waveguide structure and a sub-reflector. The coaxial waveguide structure includes a central waveguide and an outer waveguide that circumferentially surrounds the central waveguide. The sub-reflector is mounted proximate the distal end of the coaxial waveguide structure.

A method for solving a sequential decision-making problem is provided. The method includes gathering state-action pair data from an expert policy; applying imitation learning to yield a cloned policy based on the gathered state-action pair data from the expert policy; and applying a reinforcement learning technique, wherein the reinforcement learning technique is initialized based on the cloned policy and has an output with one or more action to be performed for solving the sequential decision-making problem.

A method for solving a sequential decision-making problem is provided. The method includes gathering state-action pair data from an expert policy; applying imitation learning to yield a cloned policy based on the gathered state-action pair data from the expert policy; and applying a reinforcement learning technique, wherein the reinforcement learning technique is initialized based on the cloned policy and has an output with one or more action to be performed for solving the sequential decision-making problem.