Abstract: A slot antenna includes a substrate having a first side and a second side, a first conductive layer on the first side of the substrate, and a second conductive layer on the second side of the substrate. A first aperture is in the first conductive layer, a second aperture is in the first conductive layer, a first slotline is in the first conductive layer and in communication with the first aperture, and a second slotline is in the first conductive layer and in communication with the second aperture. A third aperture can be in the second conductive layer. A plurality of vias can be in the substrate and surrounding at least a portion of a region including the first aperture, the second aperture, the first slotline, and the second slotline, each of the vias extending through the substrate from the first conductive layer to the second conductive layer.

Abstract: A slot antenna includes a substrate having a first side and a second side, a first conductive layer on the first side of the substrate, and a second conductive layer on the second side of the substrate. A first aperture is in the first conductive layer, a second aperture is in the first conductive layer, a first slotline is in the first conductive layer and in communication with the first aperture, and a second slotline is in the first conductive layer and in communication with the second aperture. A third aperture can be in the second conductive layer. A plurality of vias can be in the substrate and surrounding at least a portion of a region including the first aperture, the second aperture, the first slotline, and the second slotline, each of the vias extending through the substrate from the first conductive layer to the second conductive layer.

Abstract: A dual mode array antenna including a ground plane, a plurality of antenna elements, a tuning mechanism for tuning the array antenna to a resonant frequency, and a base defining a cavity having a depth that is less than half of a wavelength at an upper frequency of the array antenna is disclosed. Each of the plurality of antenna elements includes at least one spiral arm and each of the plurality of antenna elements is embedded in the cavity. The dual mode array antenna operates between the upper frequency and a lower frequency and may operate in one or more resonant frequencies.

Abstract: A dual mode array antenna including a ground plane, a plurality of antenna elements, a tuning mechanism for tuning the array antenna to a resonant frequency, and a base defining a cavity having a depth that is less than half of a wavelength at an upper frequency of the array antenna is disclosed. Each of the plurality of antenna elements includes at least one spiral arm and each of the plurality of antenna elements is embedded in the cavity. The dual mode array antenna operates between the upper frequency and a lower frequency and may operate in one or more resonant frequencies.

Abstract: An exponentially tapered slot antenna assembly includes a plurality of antenna panels arranged together in a general box-like configuration. At each corner of the box-like configuration, a capacitive load panel is in operative electrical communication with orthogonal pairs of antenna panels. Each antenna panel defines an inner and outer surface and has an electromagnetic interference shielding material positioned thereon. The shielding material positioned may be positioned near a first or upper edge of each antenna panel of the assembly. It has been empirically determined that this configuration enables an operational bandwidth that is greater than 5:1 and a voltage standing wave ratio that is less than 3:1 over the 5:1 bandwidth.

Abstract: An exponentially tapered slot antenna assembly includes a plurality of antenna panels arranged together in a general box-like configuration. At each corner of the box-like configuration, a capacitive load panel is in operative electrical communication with orthogonal pairs of antenna panels. Each antenna panel defines an inner and outer surface and has an electromagnetic interference shielding material positioned thereon. The shielding material positioned may be positioned near a first or upper edge of each antenna panel of the assembly. It has been empirically determined that this configuration enables an operational bandwidth that is greater than 5:1 and a voltage standing wave ratio that is less than 3:1 over the 5:1 bandwidth.