The radiation properties of electrically small folded spherical helix antennas

By S. Best. IEEE Transactions on Antennas and Propagation, 2004

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Low Q electrically small linear and elliptical polarized spherical dipole antennas (2005, methodology): “arm length, the number of folded arms, the antenna’s overall spherical radius and the values of resonant frequency and resonant resistance [10].”
New Radiation$Q$Limits for Spherical Wire Antennas (2006, result): “Independently published computer-simulated and measured results [5], [6] for a folded spherical helix antenna exhibit ex-”
Metamaterial-based efficient electrically small antennas (2006, background): “There have been a wide variety of recent approaches to achieve this goal including clever packing of resonant antenna elements into this small volume using natural geometrical configurations [12]–[15], fractal curve antennas [20]–[23] and”
A Compact Transmission-Line Metamaterial Antenna With Extended Bandwidth (2009, background): “The typical difficulties encountered when designing compact antennas include narrow bandwidth, impedance matching to a low radiation resistance, and low radiation efficiency [1].”
Metamaterial-Inspired, Electrically Small Huygens Sources (2010, background): “It considered a combination of separately fed, low , spherical electric [1] and magnetic [11] dipoles.”