Abstract: A circularly polarized reflect array antenna having a plurality of antenna elements, where each antenna element has an electrically conductive patch, at least two electrically conductive stubs positioned along the periphery of the patch, and at least two switches each operable to connect or disconnect the patch to one of the at least two stubs.

Abstract: A circularly polarized reflect array antenna having a plurality of antenna elements, where each antenna element has an electrically conductive patch, at least two electrically conductive stubs positioned along the periphery of the patch, and at least two switches each operable to connect or disconnect the patch to one of the at least two stubs.

Abstract: An efficient monopulse direction finding technique is based on the best algorithm in the least squares sense for a given antenna configuration. The algorithm simultaneously uses complex voltage data from all of the antenna ports, i.e., all of the available data received. No a priori emitter polarization information is assumed. Only a two dimensional search for the performance index minimum is needed to find the solution. The method is extended to N emitters with a search in only 2N space for the N emitter angles.

Abstract: A device and method of making the device for regulating electromagnetic radiations in a predetermined frequency range, which comprises a substrate and a coating mixture on a surface of the substrate. The coating mixture is provided by mixing together: (a) a plurality of flakes of a magnetic or ferrite material having substantial length and width dimensions relative to their thickness, the thickness of substantially all of the flakes being less than the skin depth of all frequencies in the predetermined frequency range, (b) at least one surfactant, (c)) a vaporizable electrically insulating material and (d) a solvent. The mixture is sprayed onto the surface of the substrate, either with or without a magnetic field at the surface, and the solvent is removed to retain the flakes on the substrate spaced from each other by the electrically insulating material and disposed substantially parallel to the portion of the plane of the surface thereunder.

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 circularly polarized reflect array antenna having a plurality of antenna elements, where each antenna element has an electrically conductive patch, at least two electrically conductive stubs positioned along the periphery of the patch, and at least two switches each operable to connect or disconnect the patch to one of the at least two stubs.

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: The disclosure relates to a multipolarized broad band antenna and antenna system wherein the antenna structure is formed on a substrate, the antenna structure on the substrate including a central feedpoint, a first antenna element having a plurality of regions composed of first plural interconnected concentric sectors of circles of diminishing radius extending to the feedpoint, and a second antenna element having a plurality of regions composed of second plural interconnected concentric sectors of circles of diminishing radius extending to the feedpoint, the second plural concentric sectors being interleaved with the first plural concentric sectors.

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.