A surface mounted device （SMD） microwave ceramic band-pass filter for mobile communication with a new coupling structure is reported in this paper. In this filter, the external and internal coupling structures are f...A surface mounted device （SMD） microwave ceramic band-pass filter for mobile communication with a new coupling structure is reported in this paper. In this filter, the external and internal coupling structures are fabricated on an alumina substrate and both resonators and coupling structures are placed into a metal house to cut off its radiation. The relationship between the coupling structures and the performance of the filter is analyzed by high frequency structure software （HFSS） and the filter with a center frequency of 836.5 MHz, bandwidth of 40.0 MHz, pass-band ripple of 0.1 dB and insertion loss of 1.5 dB has been successfully designed and fabricated. The measured results show a good agreement with the simulation results.展开更多
Fluxless soldering can solve a series of problems caused by side-effects afflux essentially. Feasibility research on vacuum fluxless laser soldering and mechanism analysis on fluxless action of vacuum were carried out...Fluxless soldering can solve a series of problems caused by side-effects afflux essentially. Feasibility research on vacuum fluxless laser soldering and mechanism analysis on fluxless action of vacuum were carried out. Fluxless soldering succeeded in spreading and wetting on Cu pad with laser heating source in vacuum surroundings. What' s more, this fluxless technology was applied in surface mounting of chip resistance successfully.展开更多
We propose a stretch-based kirigami structure with folding lines(referred to as a“kiri-origami”structure)and folding methods of the kiri-origami structure for stretchable electronic devices.The kiriorigami structure...We propose a stretch-based kirigami structure with folding lines(referred to as a“kiri-origami”structure)and folding methods of the kiri-origami structure for stretchable electronic devices.The kiriorigami structures have the advantages that rigid electronic elements such as surface mount devices(SMDs)can be mounted and large-number-of-unit structures can be folded up.We achieved the folding-up of the kiri-origami structure using buffer structures and biaxial extension to remove the cause of distortion and effectively utilized tensile force for folding.Undesirable deformations,such as panel warpage and hinge torsion,could not be ignored when using materials and configurations as stretchable electronic substrates and affected the foldability of the kirigami structure.However,our folding method could accurately fold the hinges in this situation.Finally,as a demonstration,we fabricated a kiri-origami LED matrix display with more than 500 hinges.The results indicate that kiriorigami structures are feasible for creating stretchable electronic devices with rigid electronic elements and large-area structures.展开更多
基金Supported by Sino-British Excellent Youth Scholar Foundation (2005362)the Natural Science Foundation of Hubei Province (2008CDB315)
文摘A surface mounted device （SMD） microwave ceramic band-pass filter for mobile communication with a new coupling structure is reported in this paper. In this filter, the external and internal coupling structures are fabricated on an alumina substrate and both resonators and coupling structures are placed into a metal house to cut off its radiation. The relationship between the coupling structures and the performance of the filter is analyzed by high frequency structure software （HFSS） and the filter with a center frequency of 836.5 MHz, bandwidth of 40.0 MHz, pass-band ripple of 0.1 dB and insertion loss of 1.5 dB has been successfully designed and fabricated. The measured results show a good agreement with the simulation results.
基金This project is subsidized by Natural Science Funds of Naion.The authorized number is 59671063.
文摘Fluxless soldering can solve a series of problems caused by side-effects afflux essentially. Feasibility research on vacuum fluxless laser soldering and mechanism analysis on fluxless action of vacuum were carried out. Fluxless soldering succeeded in spreading and wetting on Cu pad with laser heating source in vacuum surroundings. What' s more, this fluxless technology was applied in surface mounting of chip resistance successfully.
基金supported by JSPS KAKENHI(Grant Number 22H04954),Japan.
文摘We propose a stretch-based kirigami structure with folding lines(referred to as a“kiri-origami”structure)and folding methods of the kiri-origami structure for stretchable electronic devices.The kiriorigami structures have the advantages that rigid electronic elements such as surface mount devices(SMDs)can be mounted and large-number-of-unit structures can be folded up.We achieved the folding-up of the kiri-origami structure using buffer structures and biaxial extension to remove the cause of distortion and effectively utilized tensile force for folding.Undesirable deformations,such as panel warpage and hinge torsion,could not be ignored when using materials and configurations as stretchable electronic substrates and affected the foldability of the kirigami structure.However,our folding method could accurately fold the hinges in this situation.Finally,as a demonstration,we fabricated a kiri-origami LED matrix display with more than 500 hinges.The results indicate that kiriorigami structures are feasible for creating stretchable electronic devices with rigid electronic elements and large-area structures.
