A DC to 5GHz series MEMS switch is designed and fabricated for wireless communication applications,and thermal effect and power handling of the series switch are discussed.The switch is made on glass substrate,and gol...A DC to 5GHz series MEMS switch is designed and fabricated for wireless communication applications,and thermal effect and power handling of the series switch are discussed.The switch is made on glass substrate,and gold platinum contact is used to get a stable and little insert loss.From DC to 5GHz,0 6dB insertion loss,30dB isolation,and 30μs delay are demonstrated.Thermal effect of the switch is tested in 85℃ and -55℃ atmosphere separately.From DC to 4GHz,the insert loss of the switch increases 0 2dB in 85℃ and 0 4dB in -55℃,while the isolation holds the same value as that in room temperature.To measure the power handling capability of the switch,we applied a continuous RF power increasing from 10dBm to 35 1dBm with the step of 1 0dBm across the switch at 4GHz.The switch keeps working and shows a decrease of the insert loss for 0 1~0 6dB.The maximum continuous power handling (35 1dBm,about 3 24W) is higer than the reported value of shunt switch (about 420mW),which implies series switches have much better power handling capability.展开更多
This paper presents the modeling, fabrication, and measurement of a capacitive membrane MEMS microwave power sensor. The sensor measures microwave power coupled from coplanar waveguide (CPW) transmission lines by a ...This paper presents the modeling, fabrication, and measurement of a capacitive membrane MEMS microwave power sensor. The sensor measures microwave power coupled from coplanar waveguide (CPW) transmission lines by a MEMS membrane and then converts it into a DC voltage output by using thermopiles. Since the fabrication process is fully compatible with the GaAs monolithic microwave integrated circuit (MMIC) process, this sensor could be conveniently embedded into MMIC. From the measured DC voltage output and S-parameters, the average sensitivity in the X-band is 225.43μV/mW, while the reflection loss is below -14 dB. The MEMS microwave power sensor has good linearity with a voltage standing wave ration of less than 1.513 in the whole X-band. In addition, the measurements using amplitude modulation signals prove that the modulation index directly influences the output DC voltage.展开更多
In the existing electricity market,the traditional power suppliers and renewable energy generators coexist in the power supply side. In the power supply side,renewable energy generators generate power by wind and othe...In the existing electricity market,the traditional power suppliers and renewable energy generators coexist in the power supply side. In the power supply side,renewable energy generators generate power by wind and other natural conditions,leading renewable energy output a certain randomness. However,the low marginal generating cost and the reduction of carbon emissions,and thus brings a certain advantage for renewable energy compared to alternative energy. Electricity,as a special commodity,stable and adequate power supply is a necessary guarantee for economic and social development. Power shortage situation is not allowed in the power system,and the extra power needs to be handled for the purpose of safety. In this paper,the hybrid power generated by renewable energy generators and traditional energy generators is used as power supply,and then the electricity market sells hybrid power to electricity consumers,the hybrid power system determines the optimal daytimeprice,nighttime price,and the optimal installed capacity of the renewable energy suppliers. We find that the installed capacity of renewable energy increases first and then decreases with the increase of the price sensitivity coefficient of traditional energy supply. Electricity demand is negatively related to electricity price in the current period,and is positively related to price in the other period. The average price of day and night is only related to the total potential demand of day and night and the total generation probability of renewable energy. The price difference between daytime and nighttime is positively related to potential electricity demand,and negatively related to the sensitivity coefficient of electricity price.展开更多
We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 nm.In addition to the uniform heat distribution resulting from the large surface-...We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 nm.In addition to the uniform heat distribution resulting from the large surface-to-volume ratio of this fiber-like thin-crystal rod,the long gain region provided by the tandem layout of two SCFs enables high lasing efficiency and power handling capability.More than 100 W output power is achieved at 2.1μm,corresponding to a slope efficiency of 70.5%and an optical-to-optical efficiency of 67.6%.To the best of our knowledge,this is the highest output power and efficiency ever reported from SCF lasers in the 2-μm spectral range.展开更多
Since the discovery of high temperature superconducting(HTS)materials in 1987,the performance of microwave filters such as insertion loss,selectivity,and out-band rejection has been significantly improved by utilizing...Since the discovery of high temperature superconducting(HTS)materials in 1987,the performance of microwave filters such as insertion loss,selectivity,and out-band rejection has been significantly improved by utilizing HTS films.Nowadays,HTS filters have been widely used in wireless communications,space exploration,satellite communications,and several other fields.HTS filters with a special performance,such as wideband,dual-band or multiband,frequency tunable,and high power-handling capability have been designed and fabricated in recent years to meet the increasing requirements of practical applications and to further extend the application areas.This paper reviews the various types of above-mentioned HTS filters as well as the developments of novel design methodologies.展开更多
文摘A DC to 5GHz series MEMS switch is designed and fabricated for wireless communication applications,and thermal effect and power handling of the series switch are discussed.The switch is made on glass substrate,and gold platinum contact is used to get a stable and little insert loss.From DC to 5GHz,0 6dB insertion loss,30dB isolation,and 30μs delay are demonstrated.Thermal effect of the switch is tested in 85℃ and -55℃ atmosphere separately.From DC to 4GHz,the insert loss of the switch increases 0 2dB in 85℃ and 0 4dB in -55℃,while the isolation holds the same value as that in room temperature.To measure the power handling capability of the switch,we applied a continuous RF power increasing from 10dBm to 35 1dBm with the step of 1 0dBm across the switch at 4GHz.The switch keeps working and shows a decrease of the insert loss for 0 1~0 6dB.The maximum continuous power handling (35 1dBm,about 3 24W) is higer than the reported value of shunt switch (about 420mW),which implies series switches have much better power handling capability.
基金supported by the National Natural Science Foundation of China(No.60676043)the National High Technology Research and Development Program of China(No.2007AA04Z328)
文摘This paper presents the modeling, fabrication, and measurement of a capacitive membrane MEMS microwave power sensor. The sensor measures microwave power coupled from coplanar waveguide (CPW) transmission lines by a MEMS membrane and then converts it into a DC voltage output by using thermopiles. Since the fabrication process is fully compatible with the GaAs monolithic microwave integrated circuit (MMIC) process, this sensor could be conveniently embedded into MMIC. From the measured DC voltage output and S-parameters, the average sensitivity in the X-band is 225.43μV/mW, while the reflection loss is below -14 dB. The MEMS microwave power sensor has good linearity with a voltage standing wave ration of less than 1.513 in the whole X-band. In addition, the measurements using amplitude modulation signals prove that the modulation index directly influences the output DC voltage.
基金Supported by the National Natural Science Foundation of China(71273091,71272015)the Postgraduate Innovation Fund Project of SUFE(CXJJ-2016-327)
文摘In the existing electricity market,the traditional power suppliers and renewable energy generators coexist in the power supply side. In the power supply side,renewable energy generators generate power by wind and other natural conditions,leading renewable energy output a certain randomness. However,the low marginal generating cost and the reduction of carbon emissions,and thus brings a certain advantage for renewable energy compared to alternative energy. Electricity,as a special commodity,stable and adequate power supply is a necessary guarantee for economic and social development. Power shortage situation is not allowed in the power system,and the extra power needs to be handled for the purpose of safety. In this paper,the hybrid power generated by renewable energy generators and traditional energy generators is used as power supply,and then the electricity market sells hybrid power to electricity consumers,the hybrid power system determines the optimal daytimeprice,nighttime price,and the optimal installed capacity of the renewable energy suppliers. We find that the installed capacity of renewable energy increases first and then decreases with the increase of the price sensitivity coefficient of traditional energy supply. Electricity demand is negatively related to electricity price in the current period,and is positively related to price in the other period. The average price of day and night is only related to the total potential demand of day and night and the total generation probability of renewable energy. The price difference between daytime and nighttime is positively related to potential electricity demand,and negatively related to the sensitivity coefficient of electricity price.
基金supported by the National Natural Science Foundation of China(Nos.62075090 and 52032009)。
文摘We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 nm.In addition to the uniform heat distribution resulting from the large surface-to-volume ratio of this fiber-like thin-crystal rod,the long gain region provided by the tandem layout of two SCFs enables high lasing efficiency and power handling capability.More than 100 W output power is achieved at 2.1μm,corresponding to a slope efficiency of 70.5%and an optical-to-optical efficiency of 67.6%.To the best of our knowledge,this is the highest output power and efficiency ever reported from SCF lasers in the 2-μm spectral range.
基金supported in part by the Key-Area Research and Development Program of Guangdong Province under Grant 2020B0101340002in part by the National Nature Science Foundation of China under Grants 61971415 and 61601456supported by the Youth Innovation Promotion Association of CAS under Grants Y2021004 and 2017009.
文摘Since the discovery of high temperature superconducting(HTS)materials in 1987,the performance of microwave filters such as insertion loss,selectivity,and out-band rejection has been significantly improved by utilizing HTS films.Nowadays,HTS filters have been widely used in wireless communications,space exploration,satellite communications,and several other fields.HTS filters with a special performance,such as wideband,dual-band or multiband,frequency tunable,and high power-handling capability have been designed and fabricated in recent years to meet the increasing requirements of practical applications and to further extend the application areas.This paper reviews the various types of above-mentioned HTS filters as well as the developments of novel design methodologies.