TY - GEN
T1 - 3D microwave eaton lens fabricated by polymer jetting rapid prototyping
AU - Du, Guohong
AU - Liang, Min
AU - Garcia, Raffael Austrebert Sabory
AU - Liu, Changjun
AU - Xin, Hao
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/11/12
Y1 - 2014/11/12
N2 - Eaton lens is a kind of gradient index (GRIN) device similar to Luneburg lens and Maxwell fisheye lens that the refractive index gradual varies spatially. It has some unique, enchanting properties that can be utilized in the design of antennas and radar targets. The refractive index distribution of a perfect Eaton lens that bends wave 90 degree satisfies (see Fig. 1(a) [1]): n2 = R/nr + √ (R/nr)2-1 (1) In this work, we designed, fabricated and characterized a microwave Eaton lens structure using a rapid prototyping 3D printer. The required continuously changing of relative permittivity was realized by changing the size of polymer blocks centered on the junctions of a plastic rod space frame. A 120 mm (4λ0 at 10 GHz) diameter lens is designed to work at X-band. The effective permittivity of the unit cell is calculated by effective medium theory and simulated with fullwave finite-element simulations. The center part of an ideal Eaton lens diverges to an infinite large refractive index which cannot be realized in practice. Instead, the center region is approximated by 100% filling of the polymer. A polymer jetting rapid prototyping method is implemented to fabricate the whole lens and the picture of the fabricated lens is shown in Figure 1(b). In the measurement, the lens antenna is fed by an X-band waveguide. The measured radiation pattern and near field distribution of the lens are both agree well with the simulation.
AB - Eaton lens is a kind of gradient index (GRIN) device similar to Luneburg lens and Maxwell fisheye lens that the refractive index gradual varies spatially. It has some unique, enchanting properties that can be utilized in the design of antennas and radar targets. The refractive index distribution of a perfect Eaton lens that bends wave 90 degree satisfies (see Fig. 1(a) [1]): n2 = R/nr + √ (R/nr)2-1 (1) In this work, we designed, fabricated and characterized a microwave Eaton lens structure using a rapid prototyping 3D printer. The required continuously changing of relative permittivity was realized by changing the size of polymer blocks centered on the junctions of a plastic rod space frame. A 120 mm (4λ0 at 10 GHz) diameter lens is designed to work at X-band. The effective permittivity of the unit cell is calculated by effective medium theory and simulated with fullwave finite-element simulations. The center part of an ideal Eaton lens diverges to an infinite large refractive index which cannot be realized in practice. Instead, the center region is approximated by 100% filling of the polymer. A polymer jetting rapid prototyping method is implemented to fabricate the whole lens and the picture of the fabricated lens is shown in Figure 1(b). In the measurement, the lens antenna is fed by an X-band waveguide. The measured radiation pattern and near field distribution of the lens are both agree well with the simulation.
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U2 - 10.1109/USNC-URSI.2014.6955650
DO - 10.1109/USNC-URSI.2014.6955650
M3 - Conference contribution
AN - SCOPUS:84916213746
T3 - 2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), USNC-URSI 2014 - Proceedings
SP - 267
BT - 2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), USNC-URSI 2014 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), USNC-URSI 2014
Y2 - 6 July 2014 through 11 July 2014
ER -