Abstract: An isolation barrier for reducing coupling between a transmitting antenna on a platform and a receiving antenna on the same platform. The isolation barrier expands the isolation capabilities of radar absorbing material (RAM) to the low frequency region by integrating dielectric loaded corrugations with the RAM. The isolation barrier includes a plurality of corrugations, each including a channel with two conductive walls and a conductive base, having a depth greater than a quarter of the wavelength corresponding to the low-frequency limit of the shared operating frequency band of the transmitting antenna and the receiving antenna. A layer of radar absorbing material (RAM) covers the corrugations.

Abstract: An isolation barrier for reducing coupling between a transmitting antenna on a platform and a receiving antenna on the same platform. The isolation barrier expands the isolation capabilities of radar absorbing material (RAM) to the low frequency region by integrating dielectric loaded corrugations with the RAM. The isolation barrier includes a plurality of corrugations, each including a channel with two conductive walls and a conductive base, having a depth greater than a quarter of the wavelength corresponding to the low-frequency limit of the shared operating frequency band of the transmitting antenna and the receiving antenna. A layer of radar absorbing material (RAM) covers the corrugations.

Abstract: A system for detecting radio frequency (RF) signals includes a radome including one or more phase change material (PCM) layers disposed on an inner surface thereof and a sensor at least partially disposed within the radome. The system also includes a heat source arranged such that it can direct heat toward the inner surface of the radome and a controller that causes the heat source to direct heat towards the inner surface of the radome such that a frequency selective surface (FSS) is formed thereon.

Abstract: An antenna structure and associated method are disclosed that provides a lightweight and reduced-cost antenna element. The antenna structure may include a printed circuit board material coupled to a support structure. The printed circuit board may include electrical circuitry patterns and may have components mounted thereon to provide desired transmit and receive functionality, for example, to provide radio frequency transmit/receive functionality along with phase shifter and control circuitry. The support structure may be a light-weight material, for example, a space-qualified foam material that is strong and light-weight. The combined antenna structure of the present invention may thereby form a strong, rigid and light-weight antenna structure that may be used as sub-array elements in an antenna array, such as an ESA system.

Abstract: Generally and in one form of the invention this is a periodic surface filter comprising at least one element at a surface of the filter and electronic controls to change the optical characteristics of the element. Other methods and devices are disclosed.

Abstract: Generally and in one form of the invention this is a periodic surface filter comprising at least one element at a surface of the filter and electronic controls to change the optical characteristics of the element. Other methods and devices are disclosed.

Abstract: Generally and in one form of the invention this is a periodic surface filter comprising at least one element at a surface of the filter and electronic controls to change the optical characteristics of the element. The surface filter is used as a switchable filter in a cavity for a Q-switch.

Abstract: Generally and in one form of the invention this is a periodic surface filter comprising at least one element at a surface of the filter and electronic controls to change the optical characteristics of the element. The surface filter comprising and electronically tunable electro-optic material to alter the resonant frequency of the element.

Abstract: Generally and in one form of the invention this is a periodic surface filter comprising at least one element at a surface of the filter and electronic controls to change the optical characteristics of the element. Other methods and devices are disclosed.

Abstract: A GaAs monolithic waveguide switch and system for low power consumption and high frequency switching wherein a single GaAs chip is flip-chip mounted onto a waveguide slot and inserted between interconnecting waveguides to provide single pole single throw switching. The GaAs chip includes an array of MESFETs along with connecting electrodes configured to provide low loss in the biased state and high loss in the unbiased state. The use of a single GaAs monolithic chip provides improved RF performance and manufacturability over discrete devices and provides lower power consumption as compared with silicon PIN diode waveguide switches.