Abstract: An embedded surface wave antenna is described of compact design capable of broadband performance both for impedance match and for radiation pattern characteristics comprising two spaced apart conductive planar elements, one element being a transition from a narrow portion to a wider portion according to a continuous function, said one element having an upward inclination away from the other of said conductive planar elements and ending in a termination at the wider portion, a tapered lens material having a downward inclination from said termination toward said other of said conductive planar elements to define a sloping surface therebetween for launching and receiving electromagnetic waves. The subject surface wave antenna may be readily adapted into assemblies of radiating elements in a predetermined electrical and geometric configuration to provide an array rendering a preferred radiation pattern.

Abstract: A method and apparatus is disclosed for selectively modulating r.f. signals received/transmitted via the radiation pattern side lobes of an r.f. antenna structure. Such modulation permits discrimination between desired r.f. signal energy received via the primary radiation pattern lobe and unwanted r.f. radiation (e.g. noise, jamming or other interference signals) received/transmitted via the secondary or side lobe(s) of the radiation pattern.

Abstract: The subject invention relates to antennas having substantially greater bandwidth and low angle gain of the type for the transceiving of circularly/elliptically polarized electromagnetic waves. The antenna structure comprises a ground plane, a source of linearly-polarized wave energy field associated with said ground plane, and a plurality of conductive elements having an L-shape, said elements equally spaced from one another and equiangularly disposed about the sources, said plurality of elements being in a form of a circular arrangements, each element being so disposed as to fall on the circumference of the circular arrangement, each element lying in a common plane orthogonal to the linearly-polarized wave energy field provided by said source. The subject invention has special utility in motor and marine craft for communication and navigation.

Abstract: The subject invention relates to an antenna having broadband characteristics. The antenna is a dual notch device capable of receiving or transmitting electromagnetic waves comprising a substrate, an upper planer conducting antenna element disposed on one side of the surface of said substrate and having a first curved edge, a second conducting antenna element disposed on the other side of said substrate and having a second curved edge, said first and second curved edges being closely related to one another and spaced apart in close proximity at one point to define a feed-point therebetween with adjacent curved edges gradually tapering outwardly therefrom to define flared notches interfacing one another and interconnected by said gap.

Abstract: An antenna assembly and a method for mounting an antenna element in full conformity to a substantially curved surface are disclosed. The method includes the steps of providing a first, relatively thin dielectric substrate portion having an antenna element formed on a surface thereof; providing a second, relatively thick dielectric substrate portion; shaping and securing the second substrate portion to the curved surface; and shaping and securing the first substrate portion and the antenna element to the second substrate portion. The method permits a microstrip antenna, or other thin structure supported on a substrate, to be mounted to curved surfaces of even short radius or curvature (e.g., less than four inches) in full conformity therewith without damaging the thin fragile antenna element.

Abstract: A microstrip antenna system has a central two-dimensional array (preferably square having at least 16.times.16 elements) of integrally formed conductive dual slot microstrip radiator patches. A corporate-structured array of interconnected microstrip feedlines connects a common input/output r.f. signal feedpoint to each of the central array patches and also incorporates a fixed-angle phasing offset so as to steer the main lobe or beam of the overall radiation pattern off-center. The common r.f. signal input/output connection point is itself physically offset to one side of the overall composite of array elements. Auxiliary tapered amplitude linear arrays of dual slot patches also preferably extend on all sides outwardly from the periphery of the central array so as to reduce the side lobe amplitude and main lobe beamwidth of the overall radiation pattern.

Abstract: A pair of spaced apart resonant microstrip radiators is fed from two differently polarized input/output ports by respective different feedlines to achieve different respective polarizations while at the same time minimizing undesirable r.f. coupling between the input/output ports. The preferred design embodiment minimizes feedline length while simultaneously increasing the r.f. isolation between the two differently polarized input/output ports.