Bandwidth and directivity enhancement of metamaterial-loaded loop antennas for microwave imaging applications
AuthorAntoniades, Marcos A.
Rezaeieh, S. A.
Abbosh, A. M.
PublisherInstitute of Electrical and Electronics Engineers Inc.
Source2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications, iWAT 2017
2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications, iWAT 2017
Google Scholar check
MetadataShow full item record
Compact, wideband and unidirectional loop antennas are presented, that are based on a conventional planar loop antenna that is loaded in a mu-negative (MNG) fashion with series capacitors, enabling a mu-zero (MZR) resonance to be excited. This, together with the inherent loop resonance and a third resonance introduced by a director element, result in a wide impedance bandwidth and enhanced directivity. Two variants of the MNG-loaded loop antenna are presented; one with a uniform distribution of the MNG-unit cells, and one with a non-uniform distribution. It is shown that both antennas, which have a compact size, achieve a wide operating bandwidth in excess of 50% in the range of 0.6 to 1.1 GHz in the lower UHF band. The uniformly loaded antenna has a measured gain of 3.2 dBi, while the non-uniformly loaded antenna has a higher measured gain of 4.8 dBi. Both antennas have high front-to-back ratios in the range of 10 dB throughout the operating band. © 2017 IEEE.
Showing items related by title, author, creator and subject.
Suraweera, H. A.; Krikidis, Ioannis A.; Yuen, C. (2013)
Neophytou, Kyriakos; Iezekiel, Stavros; Steeg, Matthias; Stöhr, Andreas (2018)A PCB based leaky-wave antenna (LWA) design for wide angle beam steering is presented. This design employs longitudinal slots inserted into a substrate-integrated waveguide for operation in the mm-wave V-band. It is optimized ...
Krikidis, Ioannis (2018)In this letter, we study a new technique for energy beamforming (EB) in multi-user networks, which combines large antenna retrodirectivity at the transmitter side with signal backscattering at the energy receivers. The ...