Abstract: An antenna, including a first dipole having a first polarization, the first dipole including a first pair of dipole arms, a second dipole having a second polarization, the second dipole including a second pair of dipole arms, at least one dipole arm of the first pair of dipole arms being located with respect to at least one dipole arm of the second pair of dipole arms so as to form at least one isolation slot therebetween, currents along the at least one isolation slot being operative to at least partially cancel mutual coupling between the first dipole and the second dipole, and a feed arrangement for feeding the first and second dipoles.

Abstract: An antenna, including a ground plane, a dielectric substrate formed on the ground plane, a broadband dual-polarized dipole radiating element located on the dielectric substrate, a horizontally polarized dipole radiating element located on the dielectric substrate adjacent to the broadband dual-polarized dipole radiating element and having a projection parallel to a first axis, which first axis intersects the broadband dual-polarized dipole radiating element, a vertically polarized dipole radiating element located on the dielectric substrate adjacent to the broadband dual-polarized dipole radiating element and having a projection parallel to a second axis, which second axis intersects the broadband dual-polarized dipole radiating element and is orthogonal to the first axis and a feed network for feeding the broadband dual-polarized, vertically and horizontally polarized dipole radiating elements.

Abstract: An antenna, including a broadband vertically polarized monopole radiating element, a reflector having a projection in a first plane generally perpendicular to a vertical axis of the monopole radiating element, a plurality of horizontally polarized radiating elements arranged generally concentrically with respect to the monopole radiating element, each one of the horizontally polarized radiating elements having a projection in a second plane generally perpendicular to the vertical axis, the second plane being offset from the first plane in a direction along the vertical axis and a feed arrangement for feeding the monopole and horizontally polarized radiating elements.

Abstract: An antenna, including a first dipole having a first polarization, the first dipole including a first pair of dipole arms, a second dipole having a second polarization, the second dipole including a second pair of dipole arms, at least one dipole arm of the first pair of dipole arms being located with respect to at least one dipole arm of the second pair of dipole arms so as to form at least one isolation slot therebetween, currents along the at least one isolation slot being operative to at least partially cancel mutual coupling between the first dipole and the second dipole, and a feed arrangement for feeding the first and second dipoles.

Abstract: An antenna, including a ground plane, a dielectric substrate formed on the ground plane, a broadband dual-polarized dipole radiating element located on the dielectric substrate, a horizontally polarized dipole radiating element located on the dielectric substrate adjacent to the broadband dual-polarized dipole radiating element and having a projection parallel to a first axis, which first axis intersects the broadband dual-polarized dipole radiating element, a vertically polarized dipole radiating element located on the dielectric substrate adjacent to the broadband dual-polarized dipole radiating element and having a projection parallel to a second axis, which second axis intersects the broadband dual-polarized dipole radiating element and is orthogonal to the first axis and a feed network for feeding the broadband dual-polarized, vertically and horizontally polarized dipole radiating elements.

Abstract: A dual-polarized dipole antenna including a first pair of dipole arms resonating in a first frequency band, a second pair of dipole arms intersecting the first pair of dipole arms and arranged orthogonally with respect to the first pair of dipole arms, the second pair of dipole arms resonating in the first frequency band and at least one conductive cruciform element mounted on the first and second pairs of dipole arms and resonating in a second frequency band.

Abstract: Drip emitter having a pressure compensating element that does not contact the enclosing pipe. First known drip emitter formed from a two-shot injection mold process that includes a deformable element, membrane, compressible element or pressure compensating element that compensates pressure or flow of water against a stiff injection molded surface that is part of the drip emitter body. In addition, this is the first drip emitter (two-shot or otherwise) that includes a compensating surface that is not parallel to the membrane, i.e., at an angle to the plane of the pressure compensating element. May include fluid retainment valve, ventable/anti-siphon/non-drain or other, as part of second injection with second or third material. Allows for simple injection mold construction and eliminates need for ISO conditioning to properly seat the membrane before testing.

Abstract: An antenna, including a broadband vertically polarized monopole radiating element, a reflector having a projection in a first plane generally perpendicular to a vertical axis of the monopole radiating element, a plurality of horizontally polarized radiating elements arranged generally concentrically with respect to the monopole radiating element, each one of the horizontally polarized radiating elements having a projection in a second plane generally perpendicular to the vertical axis, the second plane being offset from the first plane in a direction along the vertical axis and a feed arrangement for feeding the monopole and horizontally polarized radiating elements.

Abstract: A drip emitter that utilizes one or more filters and one or more labyrinths wherein the labyrinth couples the filter(s) to one or more water retainment valves that leads to at least one pool. Prevents clogging by eliminating air into the labyrinth via a water retainment valve that is situated after at least an initial portion of a labyrinth within the drip emitter. Includes non-drain, anti-siphon and ventable versions. Includes a method of two shot injection molding for embodiments of the drip emitter that include non-drain, anti-siphon and ventable variants.

Abstract: A non-clogging non-pressure compensated drip emitter that utilizes one or more filters or one or more inwardly offset filters that have an inlet that projects inwardly toward a centerline of the hollow cylindrical emitter body and a labyrinth having only turbulent transfer zones after water enters the labyrinth, wherein the labyrinth couples the filter(s) or inwardly offset filter(s) to the pool. Prevents clogging by eliminating dead transfer zones where sediment can accumulate where no turbulence exists. Also prevents clogging when the filter is positioned downward as the inwardly offset filter rises above any sediment when the emitter is positioned in the field in this downward orientation. Also prevents clogging flat filter configurations that have filters offset radially, i.e., redundant filters per emitter.

Abstract: Drip emitter having a pressure compensating element that does not contact the enclosing pipe. First known drip emitter formed from a two-shot injection mold process that includes a deformable element, membrane, compressible element or pressure compensating element that compensates pressure or flow of water against a stiff injection molded surface that is part of the drip emitter body. In addition, this is the first drip emitter (two-shot or otherwise) that includes a compensating surface that is not parallel to the membrane, i.e., at an angle to the plane of the pressure compensating element. May include fluid retainment valve, ventable/anti-siphon/non-drain or other, as part of second injection with second or third material. Allows for simple injection mold construction and eliminates need for ISO conditioning to properly seat the membrane before testing.

Abstract: A drip emitter that utilizes one or more filters and one or more labyrinths wherein the labyrinth couples the filter(s) to one or more water retainment valves that leads to at least one pool. Prevents clogging by eliminating air into the labyrinth via a water retainment valve that is situated after at least an initial portion of a labyrinth within the drip emitter. Includes non-drain, anti-siphon and ventable versions. Includes a method of two shot injection molding for embodiments of the drip emitter that include non-drain, anti-siphon and ventable variants.

Abstract: A non-clogging non-pressure compensated drip emitter that utilizes one or more filters or one or more inwardly offset filters that have an inlet that projects inwardly toward a centerline of the hollow cylindrical emitter body and a labyrinth having only turbulent transfer zones after water enters the labyrinth, wherein the labyrinth couples the filter(s) or inwardly offset filter(s) to the pool. Prevents clogging by eliminating dead transfer zones where sediment can accumulate where no turbulence exists. Also prevents clogging when the filter is positioned downward as the inwardly offset filter rises above any sediment when the emitter is positioned in the field in this downward orientation. Also prevents clogging flat filter configurations that have filters offset radially, i.e., redundant filters per emitter.

Abstract: A fluid emitter adapted for engagement within a malleable conduit during extrusion of the conduit. The emitter is formed of two components and has fluid labyrinth formed in a position to eliminate contact with the malleable wall of the extrusion or conduit to thereby eliminate potential variations in flow from deformation of the wall forming the conduit caused by conduit manufacturing variances. Fluid flow characteristics of pressure and volume in fluid emitted may be adjusted by mating one of a plurality of dripper caps with varying labyrinth characteristics with a single body configuration thereby minimizing inventory requirements for manufacturers.

Abstract: A drip irrigation tube having a plurality of sequentially placed emitters formed on an interior wall of the tube. Each emitter employs a series of parallel flowpaths axially positioned along the tube to provide for closer proximity of inlet ports to discharge chambers thereby providing for closer spacing of the emitters. Overlapping of the inlet portion of the sequentially positioned emitters with the outlet portion of any preceding emitter provides for even more compact positioning of the emitters along the tube.