Abstract: A low profile patch antenna surface mounted to a metal base produces superior gain in horizontal directions. A dielectric spacer and matching circuit are sandwiched between a thin circular patch radiator and an opposite ground plate, with the matching circuit between the spacer and ground plate and electrically coupled to the ground plate and radiator. The matching circuit increases antenna efficiency and bandwidth by attaining the best possible energy transfer between a transceiver and the antenna, taking into account impedance mismatch, component losses, and losses in the antenna structure.

Abstract: A resonator filter assembly is provided having a first wafer (102), a second wafer (104) and a third wafer (106). A plurality of pits are etched in the first and second wafer (102, 104) and arranged such that a plurality of resonant cavities (108) are formed with a coupling cavity (110) disposed between the resonant cavities (108). By altering the dimensions of the resonant and coupling cavities (108, 110), the frequency characteristics of the filter can be adjusted as desired.

Abstract: A filter has suspended metal structures which are surrounded by a metal shield on all sides, except at the input and output ports. The shape of the metal determines the type of filter. The signal can be coupled into and out of the filter either by coplanar waveguide ports, stripline ports, or through a waveguide connection. The metals making up the filters are suspended, and only come into contact with air or with an extremely thin dielectric. This minimizes both dielectric losses and ohmic losses in the metal, and allows filters to be made without separately mounted dielectric resonators. The low losses allows, in the cause of a bandpass filter, high Q resonators to be achieved, thus providing a high quality filter with low insertion loss in the passband.

Abstract: A horn antenna including first and second substrates having at least one first and at least one second horn shaped cavity formed in the first and second substrates, respectively. The horn shaped cavities taper from a narrow end and have a longitudinal axis along a plane parallel to a top surface of the first and second substrates. The second horn shaped cavity is disposed opposite the first horn shaped cavity and is a mirror image of the first horn shaped cavity. Internal surfaces of the first and second horn shaped cavities include a metalization layer. The horn antenna is fabricated by forming at least one mask having a longitudinally extending mask opening on the first and second substrates and preferentially etching the first and second substrate through the mask opening to form the first and second horn shaped cavities.

Abstract: A millimeter or submillimeter wavelength device including a substrate having a horn shaped cavity, and first and second extension layers formed on a top surface of the substrate adjacent to the horn shaped cavity. The first and second extension layers define additional opposed sides of the horn shaped cavity, channels, and walls of the waveguide. Internal surfaces of the horn shaped cavity, the channels, and the waveguide walls include a conductive layer. Two such structures, which are mirror images of each other, are joined to form a horn antenna with integrated channels and a waveguide. The device is fabricated by forming a resist layer on a substrate which includes a horn shaped cavity. The resist layer is etched to form a half horn antenna, channels and walls of a waveguide. Internal surfaces of the half horn antenna, the channels, and the walls of the waveguide are then metalized. Two such metalized structures are then joined to form a full horn antenna integrated with channels and a waveguide.

Abstract: A millimeter or submillimeter wavelength device including a substrate (2) having a horn shaped cavity (18), and first and second extension layers formed on a top surface of the substrate adjacent to the horn shaped cavity. The first and second extension layers define additional opposed sides of the horn shaped cavity, channels, and walls of the waveguide. Internal surfaces of the horn shaped cavity, the channels, and the waveguide walls include a conductive layer. Two such structures, which are mirror images of each other, are joined to form a horn antenna with integrated channels and a waveguide. The device is fabricated by forming a resist layer on a substrate which includes a horn shaped cavity. The resist layer is etched to form a half horn antenna, channels and walls of a waveguide. Internal surfaces of the half horn antenna, the channels, and the walls of the waveguide are then metalized. Two such metalized structures are then joined to form a full horn antenna integrated with channels and a waveguide.