In this paper,a W-band broadband vialess microstrip(MS)-to-MS vertical transition in multilayer liquid crystal polymer(LCP)substrate is presented,which consists of two MS lines in the top layer,a common ground plane a...In this paper,a W-band broadband vialess microstrip(MS)-to-MS vertical transition in multilayer liquid crystal polymer(LCP)substrate is presented,which consists of two MS lines in the top layer,a common ground plane and slotline resonators in the second layer,and a close-loop transmission-line in the third layer.To increase the passband of the vialess vertical transition,an H-shaped slotline resonator is introduced,which greatly improves the impedance performance of the slotline resonator,and the full-wave simulated results indicate that insertion loss(IL)is less than 2 dB and return loss(RL)is better than 10 dB at W-band.To verify this design,the broadband vertical transition is fabricated and measured.The measured results indicate that a broadband vertical transition with RL better than 10 dB and IL less than 5.67 dB can be obtained in the frequency range from 70.00 GHz to 104.09 GHz.Due to the fabrication error in the preparation process,the measured results are deteriorated compared to the simulated results,and the investigation indicates that the deviation is caused by the thickness error of the LCP substrate.展开更多
Photochromic liquid crystal polymer(LCP)films can undergo spontaneous mechanical deformations upon light illuminations.The light-induced strain is due to photoisomerization and the nematic–isotropic phase transition....Photochromic liquid crystal polymer(LCP)films can undergo spontaneous mechanical deformations upon light illuminations.The light-induced strain is due to photoisomerization and the nematic–isotropic phase transition.A gradient strain exists due to absorption decay of the light intensity and will produce bending of LCP strips.Beam bending models are studied for single layered and bilayered LCP strips with substrate.The results show that the multilayered structures can have much larger bending curvature due to the utilization of the average light-induced contractions which were mostly not active for single-layered LCPs.Some structural optimizations for bilayered laminate are also discussed.展开更多
基金Supported by the Shaanxi Provincial Innovation Team Project(2020TD-019)Xi'an Sciences Plan Project(21XJZZ0075)。
文摘In this paper,a W-band broadband vialess microstrip(MS)-to-MS vertical transition in multilayer liquid crystal polymer(LCP)substrate is presented,which consists of two MS lines in the top layer,a common ground plane and slotline resonators in the second layer,and a close-loop transmission-line in the third layer.To increase the passband of the vialess vertical transition,an H-shaped slotline resonator is introduced,which greatly improves the impedance performance of the slotline resonator,and the full-wave simulated results indicate that insertion loss(IL)is less than 2 dB and return loss(RL)is better than 10 dB at W-band.To verify this design,the broadband vertical transition is fabricated and measured.The measured results indicate that a broadband vertical transition with RL better than 10 dB and IL less than 5.67 dB can be obtained in the frequency range from 70.00 GHz to 104.09 GHz.Due to the fabrication error in the preparation process,the measured results are deteriorated compared to the simulated results,and the investigation indicates that the deviation is caused by the thickness error of the LCP substrate.
基金support of the National Natural Science Foundation of China(No.11072062&10772049)the High Technology Develop Program of China(863 Program:2009AA04Z408).
文摘Photochromic liquid crystal polymer(LCP)films can undergo spontaneous mechanical deformations upon light illuminations.The light-induced strain is due to photoisomerization and the nematic–isotropic phase transition.A gradient strain exists due to absorption decay of the light intensity and will produce bending of LCP strips.Beam bending models are studied for single layered and bilayered LCP strips with substrate.The results show that the multilayered structures can have much larger bending curvature due to the utilization of the average light-induced contractions which were mostly not active for single-layered LCPs.Some structural optimizations for bilayered laminate are also discussed.
