TY - JOUR
T1 - Reconfigurable diffractive antenna based on switchable electrically induced transparency
AU - Li, Huan
AU - Ye, Dexin
AU - Shen, Fazhong
AU - Zhang, Bin
AU - Sun, Yongzhi
AU - Zhu, Weiqiang
AU - Li, Changzhi
AU - Ran, Lixin
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - Coupled electromagnetic resonances have various important applications in microwave engineering. Among them, the newly discovered electromagnetically induced transparency (EIT) has attracted much interest. In this paper, we explore the use of configurable electrically induced transparency to construct a microwave 'diffractive medium' whose air-like optimally matched transparency and metal-like optimally reflective opacity can be conveniently switched by a binary dc voltage. Different from EITs based on closely coupled resonances, we use decoupled electrically induced resonances to achieve a low-loss transparency along with an optimal impedance matching with air. Satisfying the condition of a lossless perfectly matched layer, such transparency and opacity can be obtained in a wide range of incident angles. We validate our approach by experimentally demonstrating two electrically controlled steering antennas based on diffractive grating effect, both with thin planar apertures and binary digital control circuits. The proposed approach can be extended to higher frequencies, achieving configurable diffractive devices at millimeter-wave and terahertz frequencies.
AB - Coupled electromagnetic resonances have various important applications in microwave engineering. Among them, the newly discovered electromagnetically induced transparency (EIT) has attracted much interest. In this paper, we explore the use of configurable electrically induced transparency to construct a microwave 'diffractive medium' whose air-like optimally matched transparency and metal-like optimally reflective opacity can be conveniently switched by a binary dc voltage. Different from EITs based on closely coupled resonances, we use decoupled electrically induced resonances to achieve a low-loss transparency along with an optimal impedance matching with air. Satisfying the condition of a lossless perfectly matched layer, such transparency and opacity can be obtained in a wide range of incident angles. We validate our approach by experimentally demonstrating two electrically controlled steering antennas based on diffractive grating effect, both with thin planar apertures and binary digital control circuits. The proposed approach can be extended to higher frequencies, achieving configurable diffractive devices at millimeter-wave and terahertz frequencies.
KW - Beam steering
KW - Fresnel zone plate (FZP)
KW - diffractive antenna
KW - electrically induced transparency (EIT)
KW - metamaterial
UR - http://www.scopus.com/inward/record.url?scp=85027920009&partnerID=8YFLogxK
U2 - 10.1109/TMTT.2015.2393862
DO - 10.1109/TMTT.2015.2393862
M3 - Article
AN - SCOPUS:85027920009
VL - 63
SP - 925
EP - 936
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
SN - 0018-9480
IS - 3
M1 - 7027237
ER -