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Metamaterial based a printed monopole antenna for sensing applications
Author(s) -
Elwi Taha A.
Publication year - 2018
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21470
Subject(s) - monopole antenna , microstrip antenna , antenna efficiency , ground plane , metamaterial antenna , metamaterial , dipole antenna , radiation pattern , patch antenna , acoustics , antenna (radio) , materials science , physics , coaxial antenna , optoelectronics , computer science , telecommunications
The applications of metamaterials (MTM) based on interdigital capacitor ( C int ) and via that extends the function of conventional printed antennas to encompass passive wireless sensor at microwave frequencies is presented in this article. The proposed antenna consists of two rectangular arms of C int connected to a printed microstrip monopole with six shorting via wires soldered to the ground plane. The size of the whole antenna structure, including the proposed MTM, is found to be less than 0.45λ at 1.35 GHz. The antenna performances, in terms of return losses ( S 11 ), bandwidth (BW), gain ( G o ), and radiation patterns, are measured in the free space environments. To characterize the sensing properties, the antenna performance is tested in close to different types of water. It is found that the antenna exhibits a significant change in the S 11 spectra relatively to the water introduction. These advancements in the performance of the antenna are believed due to the MTM structures. The antenna shows excellent matching over several bands, however, only the resonance mode at 1.35 GHz, which the gain is relatively high, is used for sensing. The sensing mechanism is based on the S 11 spectrum change.