Abstract: A spiral antenna apparatus, which may comprise an antenna element disposed in two spiral arms in a vertical zigzag pattern. The apparatus may comprise an electromagnetic band gap cavity comprising: a ground plane, one or more layers of conductive patches, at least one pillar extending between the ground plane and a top layer of the one or more layers, and low dielectric foam disposed to fill gaps between the ground plane and the one or more layers and to fill gaps between the one or more layers. The apparatus may comprise a corrugated radio frequency choke disposed within the electromagnetic band gap cavity. At least one of the antenna element, the balun element, the electromagnetic band gap cavity, and the radio frequency choke may be fabricated using additive manufacturing.

Abstract: A spiral antenna apparatus, which may comprise an antenna element disposed in two spiral arms in a vertical zigzag pattern. The apparatus may comprise an electromagnetic band gap cavity comprising: a ground plane, one or more layers of conductive patches, at least one pillar extending between the ground plane and a top layer of the one or more layers, and low dielectric foam disposed to fill gaps between the ground plane and the one or more layers and to fill gaps between the one or more layers. The apparatus may comprise a corrugated radio frequency choke disposed within the electromagnetic band gap cavity. At least one of the antenna element, the balun element, the electromagnetic band gap cavity, and the radio frequency choke may be fabricated using additive manufacturing.

Abstract: According to some aspects, an antenna is provided comprising a substrate, a first conductive region disposed on a first side of the substrate, a second conductive region disposed on a second side of the substrate, and a coaxial transmission line, an inner conductor of the coaxial transmission line electrically coupled to the first conductive region and an outer conductor of the coaxial transmission line electrically coupled to the second conductive region, wherein the second conductive region includes at least one structural feature that functions as a choke when the first and second conductive regions are operated together as an antenna. According to some aspects, an aerial vehicle comprising a conformal antenna is provided.

Abstract: According to some aspects, an antenna is provided comprising a substrate, a first conductive region disposed on a first side of the substrate, a second conductive region disposed on a second side of the substrate, and a coaxial transmission line, an inner conductor of the coaxial transmission line electrically coupled to the first conductive region and an outer conductor of the coaxial transmission line electrically coupled to the second conductive region, wherein the second conductive region includes at least one structural feature that functions as a choke when the first and second conductive regions are operated together as an antenna. According to some aspects, an aerial vehicle comprising a conformal antenna is provided.