In this paper, a new design method for high performance octave-band stripline circulator is given. The optimum design program is given by a construction with double-Y junction aided by a section of quarter-wavelength ...In this paper, a new design method for high performance octave-band stripline circulator is given. The optimum design program is given by a construction with double-Y junction aided by a section of quarter-wavelength impedance transformer. All the calculation is simpler than that given by Y. S. Wu, et al[1-7]. Typical performances of the 2-4GHz Y-junction stripline circulator are insertion loss 0.35dB (max), isolation 21dB (min), VSWR 1.25 (max). An octave low-loss and high isolation performance is demonstrated without the need of repeated design cycles.展开更多
The abyssal circulation in the Philippine Sea(PS)is investigated,with outputs from the Simple Ocean Data Assimilation version 2.2.4(SODA224).The deep-water currents in SODA224 are carefully evaluated,with sparse in si...The abyssal circulation in the Philippine Sea(PS)is investigated,with outputs from the Simple Ocean Data Assimilation version 2.2.4(SODA224).The deep-water currents in SODA224 are carefully evaluated,with sparse in situ observations in the North Pacific Ocean.In the upper deep layer(20003000 m)of the PS,a strong westward current,which originates from the Northeast Pacific Basin and enters the PS through the Yap-Mariana Junction,exists along 1114 N.This strong westward current bifurcates into two western boundary currents off the Philippines.The northward-flowing current flows out of the PS around 2021 N,whereas the southward-flowing current transports deep water from the northern hemisphere to the southern hemisphere.In the lower deep layer(30004500 m),the inflow water first flows northward to the east of the Western Mariana Basin and then turns westward at approximately 18 N.The inflow water mainly enters the Philippine Basin(PB),with a small part turning southward to constitute a weak cyclonic circulation.The water entering the PB mainly merges into a strong southward western boundary current in the south-ern PB.In the bottom layer(below 4500 m),both the northeast and northwest PB show single cyclonic gyres,whereas the south PB shows a single anticyclonic gyre.Moreover,comparisons with the observations indicate the possible existence of a cyclonic sense of circulation over the Philippine Trench.The current study provides the implications for future observations,which are needed to fur-ther investigate the temporospatial variations of the abyssal circulation in the PS on multiple scales.展开更多
针对微波铁氧体材料与低温金属浆料及LTCC陶瓷材料在工艺上的匹配共烧的技术难题,文中采用本征模设计方法,运用阻抗匹配技术,借助微波仿真HFSS和Auto CAD软件设计了一种X波段单Y结LTCC铁氧体环形器。器件模型在10.9~12 GHz的频率范围内...针对微波铁氧体材料与低温金属浆料及LTCC陶瓷材料在工艺上的匹配共烧的技术难题,文中采用本征模设计方法,运用阻抗匹配技术,借助微波仿真HFSS和Auto CAD软件设计了一种X波段单Y结LTCC铁氧体环形器。器件模型在10.9~12 GHz的频率范围内出现环形功能,其带宽为1.1 GHz,插入损耗≤0.5 d B,回波损耗≥10 d B,隔离度≥13 d B,驻波比≤1.5 d B。此设计有望实现微波环形器与低温共烧陶瓷（LTCC）技术的有效结合。展开更多
文摘In this paper, a new design method for high performance octave-band stripline circulator is given. The optimum design program is given by a construction with double-Y junction aided by a section of quarter-wavelength impedance transformer. All the calculation is simpler than that given by Y. S. Wu, et al[1-7]. Typical performances of the 2-4GHz Y-junction stripline circulator are insertion loss 0.35dB (max), isolation 21dB (min), VSWR 1.25 (max). An octave low-loss and high isolation performance is demonstrated without the need of repeated design cycles.
基金sponsored by the Aoshan Science and Technology Innovation Project(No.2016ASKJ12)the Open Fund of the Key Laboratory of Ocean Circula-tion and Waves,Chinese Academy of Sciences(No.KLO CW1503)the National Natural Science Foundation of China(Nos.41606107,41506008,41776012,41476002)
文摘The abyssal circulation in the Philippine Sea(PS)is investigated,with outputs from the Simple Ocean Data Assimilation version 2.2.4(SODA224).The deep-water currents in SODA224 are carefully evaluated,with sparse in situ observations in the North Pacific Ocean.In the upper deep layer(20003000 m)of the PS,a strong westward current,which originates from the Northeast Pacific Basin and enters the PS through the Yap-Mariana Junction,exists along 1114 N.This strong westward current bifurcates into two western boundary currents off the Philippines.The northward-flowing current flows out of the PS around 2021 N,whereas the southward-flowing current transports deep water from the northern hemisphere to the southern hemisphere.In the lower deep layer(30004500 m),the inflow water first flows northward to the east of the Western Mariana Basin and then turns westward at approximately 18 N.The inflow water mainly enters the Philippine Basin(PB),with a small part turning southward to constitute a weak cyclonic circulation.The water entering the PB mainly merges into a strong southward western boundary current in the south-ern PB.In the bottom layer(below 4500 m),both the northeast and northwest PB show single cyclonic gyres,whereas the south PB shows a single anticyclonic gyre.Moreover,comparisons with the observations indicate the possible existence of a cyclonic sense of circulation over the Philippine Trench.The current study provides the implications for future observations,which are needed to fur-ther investigate the temporospatial variations of the abyssal circulation in the PS on multiple scales.
文摘针对微波铁氧体材料与低温金属浆料及LTCC陶瓷材料在工艺上的匹配共烧的技术难题,文中采用本征模设计方法,运用阻抗匹配技术,借助微波仿真HFSS和Auto CAD软件设计了一种X波段单Y结LTCC铁氧体环形器。器件模型在10.9~12 GHz的频率范围内出现环形功能,其带宽为1.1 GHz,插入损耗≤0.5 d B,回波损耗≥10 d B,隔离度≥13 d B,驻波比≤1.5 d B。此设计有望实现微波环形器与低温共烧陶瓷（LTCC）技术的有效结合。
