Compact Wideband Loop Antenna Partially Loaded With Mu-Negative Metamaterial Unit Cells for Directivity Enhancement
Date
2016Source
IEEE Antennas and Wireless Propagation LettersVolume
15Issue
Journal ArticlePages
1893-1896Google Scholar check
Keyword(s):
Metadata
Show full item recordAbstract
A wideband and unidirectional loop antenna partially loaded with mu-negative (MNG) metamaterial unit cells is presented. To reduce the electrical size of the antenna, its first resonance is formed by capacitively loading a conventional one-wavelength loop antenna to excite the mu-zero resonance that is independent of the resonator's size. As a result of partial loop loading using properly designed and distributed slots, the amplitude of the surface current can be engineered to be higher in the feeding arm while achieving a zero phase shift along each arm of the loop structure. Consequently, unidirectional radiation with a moderate front-to-back ratio (FBR) is achieved without using any reflectors. Moreover, as a result of the capacitive loading, the loop antenna is divided into an array of dipoles that are excited with a 90° phase difference, enabling unidirectional radiation at the loop-mode resonance. To both enhance the impedance matching of the antenna at lower frequencies and excite an additional resonance, a strip patch is added in the vicinity of the loop. The proposed structure is smaller by 80% than similar MNG loaded loops and achieves a wide fractional bandwidth of 52% (0.64-1.1 GHz) with a peak FBR and gain values of 12 dB and 3.2 dBi, respectively. © 2016 IEEE.
Collections
Cite as
Related items
Showing items related by title, author, creator and subject.
-
Article
A Compact Reconfigurable NRI-TL Metamaterial Phase Shifter for Antenna Applications
Abbasi, Muhammad Ali Babar; Antoniades, Marco A.; Nikolaou, Symeon (2018)This communication presents a compact reconfigurable phase shifter based on negative-refractive-index transmissionline (NRI-TL) metamaterial unit cells. Two interswitchable NRI-TL metamaterial unit cells are collocated ...
-
Conference Object
Compact Yagi antenna utilizing mu-negative metamaterial loading of director element
Rezaeieh, Sasan Ahdi; Antoniades, Marco A.; Abbosh, Amin M. (2018)A new technique to miniaturize Yagi antennas utilizing mu-negative (MNG) metamaterial loading is presented. In this method, the director element of the printed Yagi antenna is loaded with MNG-metamaterial unit-cells to ...
-
Article
A NRI-TL Metamaterial Leaky-Wave Antenna Radiating at Broadside With Zero Beam-Squinting
Kossifos, Kypros M.; Antoniades, Marco A. (2018)An implementation of a planar fixed-beam leaky-wave antenna that radiates at broadside is presented, consisting of a periodic arrangement of negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. ...