Open AccessUWB to 30 narrow sub‐bands frequency reconfigurable antipodal Vivaldi antenna
Author(s) -
Bitchikh M.,
Ghanem F.
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2016.2067
Subject(s) - vivaldi antenna , antipodal point , narrowband , antenna (radio) , metamaterial , optics , resonator , split ring resonator , physics , frequency band , materials science , optoelectronics , acoustics , computer science , telecommunications , radiation pattern , geometry , mathematics
An antipodal Vivaldi antenna is presented that can be switched between an UWB mode and a tuneable very narrowband mode where the 3.3–10.6 GHz band can be covered by 30 different sub‐bands. To achieve this high‐frequency resolution, a gap is inserted in the Vivaldi feedline and a split‐ring‐resonator (SRR) is disposed close to it to serve as a coupling‐bridge. By doing so, only frequencies whose quarter‐wavelengths correspond to the SRR electrical length get coupled, before being coupled again to the other side of the feedline causing thus the antenna operation. Moreover, by capacitively loading the SRR and varying the load, the frequencies that can bridge the gap are varied, which allows tuning the antenna operating band. Now, to be able to efficiently cover the whole UWB, two SRRs of different sizes are alternatively used. Each SRR can be deactivated by disrupting its structure by means of switches. Finally, to operate the antenna in the UWB mode, the two SRR's are deactivated and the gap in the feedline is closed by means of a switch. To present the Letter, simulated and measured results are presented and discussed.