Design and simulation of a four-arm hemispherical helix antenna realized through a stacked printed circuit board structure
Substrate-Integrated Millimeter-Wave and Terahertz Antenna Technology
Challenges of design and practical application of LTCC chip antennas
Small Spherical Antennas Using Arrays of Electromagnetically Coupled Planar Elements
The Spherical Coil as an Inductor, Shield, or Antenna
The radiation properties of electrically small folded spherical helix antennas