With the advent of 5G and future trends for communication systems moving to millimeter wave(MMW)and higher frequencies,antennas will be required to have high gain,wide bandwidth,and low losses.3D printing realizes str...With the advent of 5G and future trends for communication systems moving to millimeter wave(MMW)and higher frequencies,antennas will be required to have high gain,wide bandwidth,and low losses.3D printing realizes structures by sequential stacking layer-by-layer,which enables the manufacturing of antennas with ar-bitrary shapes in a cheaper,faster,and flexible manner.This study provides a review of current state-of-the-art 3D printed antennas for different frequencies.First,an overview of 3D printing technology is presented.A huge number of 3D printed antennas,categorized by their material composition,have been described,including poly-mer,metallic,ceramic,composite material,and multi-material integrated antennas.Finally,the main challenges and prospects are discussed to provide insight into how 3D printing can be further progressed in antenna manu-facturing.展开更多
Precursor-derived ceramic SiOC(PDC-SiOC)microlattices exhibit excellent oxidation resistance,high-temperature stability,and superior mechanical properties.However,the printing accuracy of the PDC-SiOC microlattices by...Precursor-derived ceramic SiOC(PDC-SiOC)microlattices exhibit excellent oxidation resistance,high-temperature stability,and superior mechanical properties.However,the printing accuracy of the PDC-SiOC microlattices by 3D printing is still limited,and mechanical properties of the PDC-SiOC microlattices have not been studied systematically.Here,PDC-SiOC octet microlattices were fabricated by projection micro stereolithography(PμSL)3D printing,and photoabsorber(Sudan III)’s effect on the accuracy was systematically analyzed.The results showed that the addition of Sudan III improved the printing accuracy significantly.Then,the ceramization process of the green body was analyzed in detail.The order of the green body decreased,and most of their chemical bonds were broken during pyrolysis.After that,the PDC-SiOC microlattices with different truss diameters in the range of 52–220μm were fabricated,and their mechanical properties were investigated.The PDC-SiOC microlattices with a truss diameter of 52μm exhibited higher compression strength(31 MPa)than those with bigger truss diameters.The size effect among the PDC-SiOC microlattices was analyzed.Our work provides a deeper insight into the manufacturing of PDC-SiOC micro-scaled architectures by 3D printing and paves a path to the research of the size effect in ceramic structures.展开更多
基金supported by National Natural Science Foundation of China(Grant.No.52275310).
文摘With the advent of 5G and future trends for communication systems moving to millimeter wave(MMW)and higher frequencies,antennas will be required to have high gain,wide bandwidth,and low losses.3D printing realizes structures by sequential stacking layer-by-layer,which enables the manufacturing of antennas with ar-bitrary shapes in a cheaper,faster,and flexible manner.This study provides a review of current state-of-the-art 3D printed antennas for different frequencies.First,an overview of 3D printing technology is presented.A huge number of 3D printed antennas,categorized by their material composition,have been described,including poly-mer,metallic,ceramic,composite material,and multi-material integrated antennas.Finally,the main challenges and prospects are discussed to provide insight into how 3D printing can be further progressed in antenna manu-facturing.
基金supported by the National Natural Science Foundation of China(No.52275310)the Open Project of State Key Laboratory of Explosion Science and Technology(No.QNKT22-15)the characterization at the Analysis&Testing Center,Beijing Institute of Technology.
文摘Precursor-derived ceramic SiOC(PDC-SiOC)microlattices exhibit excellent oxidation resistance,high-temperature stability,and superior mechanical properties.However,the printing accuracy of the PDC-SiOC microlattices by 3D printing is still limited,and mechanical properties of the PDC-SiOC microlattices have not been studied systematically.Here,PDC-SiOC octet microlattices were fabricated by projection micro stereolithography(PμSL)3D printing,and photoabsorber(Sudan III)’s effect on the accuracy was systematically analyzed.The results showed that the addition of Sudan III improved the printing accuracy significantly.Then,the ceramization process of the green body was analyzed in detail.The order of the green body decreased,and most of their chemical bonds were broken during pyrolysis.After that,the PDC-SiOC microlattices with different truss diameters in the range of 52–220μm were fabricated,and their mechanical properties were investigated.The PDC-SiOC microlattices with a truss diameter of 52μm exhibited higher compression strength(31 MPa)than those with bigger truss diameters.The size effect among the PDC-SiOC microlattices was analyzed.Our work provides a deeper insight into the manufacturing of PDC-SiOC micro-scaled architectures by 3D printing and paves a path to the research of the size effect in ceramic structures.
