Infinite Wavelength Resonant Antennas With Monopolar Radiation Pattern Based on Periodic Structures

By A. Lai, Kevin M. K. H. Leong, Tatsuo Itoh. IEEE Transactions on Antennas and Propagation, 2007

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Miniaturized Substrate Integrated Waveguide Slot Antennas Based on Negative Order Resonance (2010, background): “2078449 low radiation efficiency [15], [16].”
CRLH metamaterial leaky-wave and resonant antennas (2008, background): “h' is shown in Figure 14a, along with its typical radiation patterns in Figure 14b [ 43 ].”
A Folded-Monopole Model for Electrically Small NRI-TL Metamaterial Antennas (2008, methodology): “T HE Transmission-Line (TL) approach to synthesizing Negative-Refractive-Index (NRI) metamaterials (MTM), has proven to be very attractive for the design of compact, broadband antennas and microwave devices [1], [2].”
Compact Coplanar Waveguide (CPW)-Fed Zeroth-Order Resonant Antennas With Extended Bandwidth and High Efficiency on Vialess Single Layer (2011, background): “Moreover, the use of a via free and single layer process results in a simpler fabrication process compared with that of the broad metamaterial resonant antennas proposed in [10]–[12].”
A Compact Transmission-Line Metamaterial Antenna With Extended Bandwidth (2009, background): “Besides, unlike [8], the matching network is directly applied when , and therefore an impedance transformer is not necessary.”