A planar zeroth-order resonator antenna using a left-handed transmission line

By Atsushi Sanada, M. Kimura, I. Awai, Christophe Caloz, Tatsuo Itoh. European Microwave Conference, 2004

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Epsilon Negative Zeroth-Order Resonator Antenna (2007, methodology): “Thus, it is expected that the radiation pattern of ZOR antennas is omnidirectional [5] and it is confirmed by the simulation and measurement as shown in Fig.”
Broadband Microstrip Antenna With Left-Handed Metamaterials (2009, methodology): “Many microwave circuits have been implemented by using this strategy such as compact broadband couplers [12], [21], broadband phase shifters [20], compact wideband filters [22], compact resonator antennas [23]–[26].”
Infinite Wavelength Resonant Antennas With Monopolar Radiation Pattern Based on Periodic Structures (2007, methodology): “In the case of the interdigital-based unit-cell antenna implemented in [ 8 ], a patch-like radiation is present since there is only one radiating open-boundary.”
A Compact Transmission-Line Metamaterial Antenna With Extended Bandwidth (2009, background): “The first proposals of using TL-MTM structures at resonance to implement small printed antennas have been documented in [4] and [5].”