Abstract: Disclosed are exemplary embodiments of omnidirectional single-input single-output (SISO) multiband/broadband antennas. In an exemplary embodiment, an omnidirectional SISO multiband/broadband antenna generally includes a radiator element having a single piece construction with a stamped cone shape defined by multiple stamped portions.

Abstract: Disclosed are exemplary embodiments of multiband WiFi directional antennas. In an exemplary embodiment, an antenna generally includes a base plate, a plurality of vertically polarized antenna element modules on the base plate, and a plurality of horizontally polarized antenna element modules on the base plate. Each antenna element module includes a radiating element and a ground plane/reflector. The antenna may be operable within at least a first WiFi frequency range and a second WiFi frequency range different than the first WiFi frequency range.

Abstract: According to various aspects, exemplary embodiments are disclosed of antenna assemblies. In an exemplary embodiment, an antenna assembly generally includes a feed network and a ground plane. Radiating dipoles or dipole radiating elements are along or on opposite sides of the feed network and the ground plane. The radiating dipoles or dipole radiating elements may be operable simultaneously and may co-locate radio frequency currents for a first frequency band and a second frequency band.

Abstract: Disclosed are exemplary embodiments of multiband WiFi directional antennas. In an exemplary embodiment, an antenna generally includes a base plate, a plurality of vertically polarized antenna element modules on the base plate, and a plurality of horizontally polarized antenna element modules on the base plate. Each antenna element module includes a radiating element and a ground plane/reflector. The antenna may be operable within at least a first WiFi frequency range and a second WiFi frequency range different than the first WiFi frequency range.

Abstract: Disclosed are exemplary embodiments of omnidirectional broadband antennas. In an exemplary embodiment, an antenna generally includes a ground element, an antenna element, and an annular patch element. The antenna element may be electrically isolated from the ground element. The antenna element may include at least one portion that is substantially conical, substantially pyramidal, and/or that tapers in a longitudinal direction. The annular patch element is electrically grounded to the ground element. The annular patch element surrounds at least a portion of the antenna element and is parasitically coupled to the antenna element.

Abstract: According to various aspects, exemplary embodiments are disclosed of antenna assemblies. In an exemplary embodiment, an antenna assembly generally includes a feed network and a ground plane. Radiating dipoles or dipole radiating elements are along or on opposite sides of the feed network and the ground plane. The radiating dipoles or dipole radiating elements may be operable simultaneously and may co-locate radio frequency currents for a first frequency band and a second frequency band.

Abstract: Disclosed are exemplary embodiments of omnidirectional single-input single-output (SISO) multiband/broadband antennas. In an exemplary embodiment, an omnidirectional SISO multiband/broadband antenna generally includes a radiator element having a single piece construction with a stamped cone shape defined by multiple stamped portions.

Abstract: Disclosed are exemplary embodiments of omnidirectional broadband antennas. In an exemplary embodiment, an antenna generally includes a ground element, an antenna element, and an annular patch element. The antenna element may be electrically isolated from the ground element. The antenna element may include at least one portion that is substantially conical, substantially pyramidal, and/or that tapers in a longitudinal direction. The annular patch element is electrically grounded to the ground element. The annular patch element surrounds at least a portion of the antenna element and is parasitically coupled to the antenna element.

Abstract: According to various aspects, exemplary embodiments are disclosed of antenna assemblies. In an exemplary embodiment, an antenna assembly generally includes a feed network and a ground plane. Radiating dipoles or dipole radiating elements are along or on opposite sides of the feed network and the ground plane. The radiating dipoles or dipole radiating elements may be operable simultaneously and co-locate radio frequency currents for a first frequency band and a second frequency band.

Abstract: According to various aspects, exemplary embodiments are disclosed of antenna assemblies. In an exemplary embodiment, an antenna assembly generally includes a feed network and a ground plane. Radiating dipoles or dipole radiating elements are along or on opposite sides of the feed network and the ground plane. The radiating dipoles or dipole radiating elements may be operable simultaneously and co-locate radio frequency currents for a first frequency band and a second frequency band.

Abstract: Disclosed are exemplary embodiments of passive radio-frequency identification (RFID) readers operable for creating a relatively uniform near field adjacent a planar surface for reading RFID tags generally above the planar surface. The RFID reader may include a plurality of antenna elements distributed in an array underneath the planar surface. A central antenna element may be located within the array generally between two or more perimetric antenna elements. A network may distribute electromagnetic energy to the antenna elements such that a current phase of at least one perimetric antenna element is out of phase with and lagging a current phase of the central antenna element. Alternatively, the perimetric antenna elements may be parasitically coupled to the central antenna element, such that a current phase of at least one perimetric antenna element is out of phase with and lagging a current phase of the central antenna element.

Abstract: Exemplary embodiments are provided of RFID antenna assemblies having folded patch-antenna structures and that are configured with circular polarization or dual linear polarization. An antenna assembly may generally include two folded patch-antenna structures oriented generally perpendicularly to each other. Each folded patch may create a linear polarization wave. When each folded patch is fed independently, the antenna assembly radiates two independent waves that are perpendicularly polarized to each other, therefore providing a dual polarized antenna. In other embodiments, the antenna assembly may include two folded patch-antenna structures again oriented generally perpendicularly to each other. By feeding each folded patch with a 90-degree phase delay between them, a circular polarization wave is radiated. A power divider network may be used to feed the two folded patches with the 90-degree phase delay. The two folded patches may be integrated so as to form a cavity or housing for a printed circuit board.

Abstract: Disclosed are exemplary embodiments of passive radio-frequency identification (RFID) readers operable for creating a relatively uniform near field adjacent a planar surface for reading RFID tags generally above the planar surface. The RFID reader may include a plurality of antenna elements distributed in an array underneath the planar surface. A central antenna element may be located within the array generally between two or more perimetric antenna elements. A network may distribute electromagnetic energy to the antenna elements such that a current phase of at least one perimetric antenna element is out of phase with and lagging a current phase of the central antenna element. Alternatively, the perimetric antenna elements may be parasitically coupled to the central antenna element, such that a current phase of at least one perimetric antenna element is out of phase with and lagging a current phase of the central antenna element.

Abstract: Exemplary embodiments are provided of RFID antenna assemblies having folded patch-antenna structures and that are configured with circular polarization or dual linear polarization. An antenna assembly may generally include two folded patch-antenna structures oriented generally perpendicularly to each other. Each folded patch may create a linear polarization wave. When each folded patch is fed independently, the antenna assembly radiates two independent waves that are perpendicularly polarized to each other, therefore providing a dual polarized antenna. In other embodiments, the antenna assembly may include two folded patch-antenna structures again oriented generally perpendicularly to each other. By feeding each folded patch with a 90-degree phase delay between them, a circular polarization wave is radiated. A power divider network may be used to feed the two folded patches with the 90-degree phase delay. The two folded patches may be integrated so as to form a cavity or housing for a printed circuit board.

Abstract: The antenna includes a metallic enclosure having a height dimension. At least one slotted opening is formed along the metallic enclosure. Each slotted opening has a slotted opening length and a slotted opening width. The slotted opening length is at least twice as long as the slotted opening width is wide. The slotted opening width is less than one wavelength wide and the slotted opening width is within a half wavelength of the height dimension. At least one feed is provided at least partially within the enclosure.

Abstract: The antenna includes a metallic enclosure having a height dimension. At least one slotted opening is formed along the metallic enclosure. Each slotted opening has a slotted opening length and a slotted opening width. The slotted opening length is at least twice as long as the slotted opening width is wide. The slotted opening width is less than one wavelength wide and the slotted opening width is within a half wavelength of the height dimension. At least one feed is provided at least partially within the enclosure.

Abstract: A dual polarized integrated antenna comprising: a quadrifilar radiator; a printed circuit board having a ground plane on an upper surface, wherein the quadrifilar radiator is centrally disposed upon the ground plane; a plurality of lower surface micro-strip traces disposed on a lower surface of the printed circuit board; and a monopole array mounted on the printed circuit board and contactingly engaging the plurality of lower surface micro-strip traces.