Browsing by Author "Kurdjumov, S."

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  • Decoupling of Two Closely Located Dipole Antennas by a Split-Loop Resonator
    (2018-11) Sharifian Mazraeh Mollaei, Masoud; Hurshkainen, A.; Kurdjumov, S.; Glybovski, S.; Simovski, Constantin
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    In this paper, we theoretically and experimentally prove the possibility of the passive electromagnetic decoupling for two parallel resonant dipoles by a split-loop resonator having the resonance band overlapping with that of the active dipoles. We show that the replacement of the decoupling dipole suggested in the literature as a tool for decoupling of two closely located dipole antennas by our split-loop resonator results in the twofold enlargement of the operation band.
  • Double-resonant decoupling method in very dense dipole arrays
    (2020-05-01) Sharifian Mazraeh Mollaei, Masoud; Hurshkainen, Anna; Kurdjumov, S.; Simovski, C.
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    In this paper an approach for broadening of operational band in a dense array of dipole antennas by implementing passive split-loop resonators (SLRs) as decouplers is presented. Compared to the previous method, where three closely located active dipoles were decoupled by two passive dipole, the operational band is significantly improved from 0.5% to 1.6% at the same level of decoupling −8 dB for the cross-talk and inter-channel transmittance. To delineate, the presence of two SLRs results in birefringence of the resonant interaction of SLRs which creates two different eigenmodes for decoupling. As a result, a dual-resonant decoupled band is obtained. Alongside with analytical investigation, numerical and experimental investigations verify the veracity of our approach. Moreover, the possibility of decoupling by SLRs for arrays with more active dipoles is investigated numerically.
  • Passive electromagnetic decoupling in an active metasurface of dipoles
    (2018-12-01) Sharifian Mazraeh Mollaei, Masoud; Hurshkainen, A.; Kurdjumov, S.; Glybovski, S.; Simovski, C.
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Passive electromagnetic decoupling in a very dense array of resonant active dipoles is a challenging task. Here we consider the decoupling of three very closely located resonant dipoles by two similar passive dipoles. In the non-resonant case it is not reducible to the decoupling of two active dipoles by a passive one. However, in the present case when the active dipoles have the resonant length their approximate decoupling is really achievable in the same way for both dimer and trimer of active dipoles. We prove this fact analytically, verify numerically and validate experimentally. Decoupling allows one to use different elements of the array in both transmitting and receiving regimes simultaneously that can be treated in terms of an active metasurface.