We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and ...We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and a large free spectral range of 18 nm. Experimental results show a box-like channel dropping response, which has a 3 dB bandwidth of -2.7nm, high out-of-band signal rejection of around 40dB and a very low drop loss （〈0.5dB）. Simulation agrees well with the experiments. The footprint of the whole chip is only 0.0003mm2.展开更多
By means of a characterization of compact spaces in terms of open CD*-filters induced by a , a - and open CD*-filters process of compactifications of an arbitrary topological space Y is obtained in Sec. 3 by embedding...By means of a characterization of compact spaces in terms of open CD*-filters induced by a , a - and open CD*-filters process of compactifications of an arbitrary topological space Y is obtained in Sec. 3 by embedding Y as a dense subspace of , YS = {ε |ε is an open CD*-filter that does not converge in Y}, YT = {A|A is a basic open CD*-filter that does not converge in Y}, is the topology induced by the base B = {U*|U is open in Y, U ≠φ} and U* = {F∈Ysw (or YTw)|U∈F}. Furthermore, an arbitrary Hausdorff compactification (Z, h) of a Tychonoff space X?can be obtained from a by the?similar process in Sec.3.展开更多
Using the finite element method (FEM) in two dimensions and the CST MICROWAVE STUDIO? (CST MWS) Transient Solver, the electromagnetic (EM) analysis and the design of a novel compact ultra wideband (UWB) bandpass filte...Using the finite element method (FEM) in two dimensions and the CST MICROWAVE STUDIO? (CST MWS) Transient Solver, the electromagnetic (EM) analysis and the design of a novel compact ultra wideband (UWB) bandpass filter using rectangular coaxial cables with square inner conductors, convenient for high power applications, are presented. The design of the UWB BP filter is based on the use of impedance steps and coupled-line sections. The center frequency around 6.85 GHz was selected, the bandwidth is between 3-10 GHz, the insertion-loss amounts to around 0.35 dB and the return loss is found higher than 10 dB in a large frequency range (4-9.5) GHz. The simulated results of stopband performances are better than 15 dB for a frequency range up to 11 GHz. For the selected center frequency and on a substrate with a dielectric constant of 2.03, the rectangular coaxial cables BPF with square inner conductors is only 6.7 × 8.9 × 33.4 mm in size.展开更多
Improvement of digital FIR filter is vital in the field of Digital Signal Processing in order to reduce the area, delay and power. Multiplication and Accumulation (MAC) unit of Finite Impulse Response (FIR) filte...Improvement of digital FIR filter is vital in the field of Digital Signal Processing in order to reduce the area, delay and power. Multiplication and Accumulation (MAC) unit of Finite Impulse Response (FIR) filter has been designed using efficient multiplier and adder circuits for optimized APT (Area,Power and Timing) product. In this paper, the design of direct form FIR filter with efficient MAC unit has been presented. Initially, full adder and half adder structures are shrunk down by reducing number of gates. These compact full adder and half adder structures are incorporated into Wallace Multiplier and Improved Carry-Save Adder. The proposed 16-bit Carry-Save Adder has been improved by splitting into four parallel phases. Consequently the delay of enhanced Carry- Save Adder is reduced. Generation of carry output is performed using number of OR gates in a sequential manner. All these enhanced architectures are incorporated into the Digital FIR Filter to reduce the area, delay and power utilization.展开更多
针对实际工程应用中无源滤波系统占用空间受限制的问题,提出了无源滤波器与整流变压器紧凑化设计方法。首先理论分析了解耦机理;其次采用Ansoft对某一容量300 k V·A样机进行建模,结合降阶电感矩阵方法计算出变压器各绕组之间的耦...针对实际工程应用中无源滤波系统占用空间受限制的问题,提出了无源滤波器与整流变压器紧凑化设计方法。首先理论分析了解耦机理;其次采用Ansoft对某一容量300 k V·A样机进行建模,结合降阶电感矩阵方法计算出变压器各绕组之间的耦合系数及紧凑式滤波电抗器电感值;最后,将样机应用于某一实际整流系统中。仿真结果与实验测量对比表明:紧凑式滤波器具有明显的谐波抑制效果。相比传统无源滤波器,紧凑式滤波器占用空间大幅降低,可广泛应用于整流机组空间受限的场合。展开更多
为了实现倍频器多谐波输出,满足系统多频率需求,同时减少成本,增加系统集成度,引入了改进紧凑型悬置微带谐振单元(Compact Suspended Microstrip Resonators(CSMRs))滤波器,主要研究并实现了170 GHz和340 GHz双频段分别输出。仿真中分...为了实现倍频器多谐波输出,满足系统多频率需求,同时减少成本,增加系统集成度,引入了改进紧凑型悬置微带谐振单元(Compact Suspended Microstrip Resonators(CSMRs))滤波器,主要研究并实现了170 GHz和340 GHz双频段分别输出。仿真中分别设计170 GHz和340 GHz探针,引入CSMRs低通滤波器增加170 GHz对高频段的隔离,减小波导高度,提高WR.2.8波导截止频率,增加对300 GHz以下频段抑制,为了测试其输出特性和网络损耗,设计170~340 GHz背靠背模块。仿真结果为低通CSMRs滤波器满足在20~180 GHz通带内反射系数小于-18 d B,在266~520 GHz阻带内抑制度大于20 d B,背靠背结构仿真170 GHz与340 GHz频段反射系数均小于-15 d B,端口隔离大于30 d B,表现出良好的选频特性。测试结果表明:在170 GHz端口通带为150~185 GHz,反射系数小于-10 d B,损耗大于1.2 d B;在340 GHz端口,通带为306~355 GHz,反射系数小于-10 d B,损耗2 d B,两端口隔离度大于10 d B,最好60 d B。展开更多
基金Supported by the National High Technology Research and Development Program of China under Grant No 2015AA016904the National Key Research and Development Plan of China under Grant No 2016YFB0402502the National Natural Science Foundation of China under Grant No 61275065
文摘We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and a large free spectral range of 18 nm. Experimental results show a box-like channel dropping response, which has a 3 dB bandwidth of -2.7nm, high out-of-band signal rejection of around 40dB and a very low drop loss （〈0.5dB）. Simulation agrees well with the experiments. The footprint of the whole chip is only 0.0003mm2.
文摘By means of a characterization of compact spaces in terms of open CD*-filters induced by a , a - and open CD*-filters process of compactifications of an arbitrary topological space Y is obtained in Sec. 3 by embedding Y as a dense subspace of , YS = {ε |ε is an open CD*-filter that does not converge in Y}, YT = {A|A is a basic open CD*-filter that does not converge in Y}, is the topology induced by the base B = {U*|U is open in Y, U ≠φ} and U* = {F∈Ysw (or YTw)|U∈F}. Furthermore, an arbitrary Hausdorff compactification (Z, h) of a Tychonoff space X?can be obtained from a by the?similar process in Sec.3.
文摘Using the finite element method (FEM) in two dimensions and the CST MICROWAVE STUDIO? (CST MWS) Transient Solver, the electromagnetic (EM) analysis and the design of a novel compact ultra wideband (UWB) bandpass filter using rectangular coaxial cables with square inner conductors, convenient for high power applications, are presented. The design of the UWB BP filter is based on the use of impedance steps and coupled-line sections. The center frequency around 6.85 GHz was selected, the bandwidth is between 3-10 GHz, the insertion-loss amounts to around 0.35 dB and the return loss is found higher than 10 dB in a large frequency range (4-9.5) GHz. The simulated results of stopband performances are better than 15 dB for a frequency range up to 11 GHz. For the selected center frequency and on a substrate with a dielectric constant of 2.03, the rectangular coaxial cables BPF with square inner conductors is only 6.7 × 8.9 × 33.4 mm in size.
文摘Improvement of digital FIR filter is vital in the field of Digital Signal Processing in order to reduce the area, delay and power. Multiplication and Accumulation (MAC) unit of Finite Impulse Response (FIR) filter has been designed using efficient multiplier and adder circuits for optimized APT (Area,Power and Timing) product. In this paper, the design of direct form FIR filter with efficient MAC unit has been presented. Initially, full adder and half adder structures are shrunk down by reducing number of gates. These compact full adder and half adder structures are incorporated into Wallace Multiplier and Improved Carry-Save Adder. The proposed 16-bit Carry-Save Adder has been improved by splitting into four parallel phases. Consequently the delay of enhanced Carry- Save Adder is reduced. Generation of carry output is performed using number of OR gates in a sequential manner. All these enhanced architectures are incorporated into the Digital FIR Filter to reduce the area, delay and power utilization.
文摘针对实际工程应用中无源滤波系统占用空间受限制的问题,提出了无源滤波器与整流变压器紧凑化设计方法。首先理论分析了解耦机理;其次采用Ansoft对某一容量300 k V·A样机进行建模,结合降阶电感矩阵方法计算出变压器各绕组之间的耦合系数及紧凑式滤波电抗器电感值;最后,将样机应用于某一实际整流系统中。仿真结果与实验测量对比表明:紧凑式滤波器具有明显的谐波抑制效果。相比传统无源滤波器,紧凑式滤波器占用空间大幅降低,可广泛应用于整流机组空间受限的场合。
文摘为了实现倍频器多谐波输出,满足系统多频率需求,同时减少成本,增加系统集成度,引入了改进紧凑型悬置微带谐振单元(Compact Suspended Microstrip Resonators(CSMRs))滤波器,主要研究并实现了170 GHz和340 GHz双频段分别输出。仿真中分别设计170 GHz和340 GHz探针,引入CSMRs低通滤波器增加170 GHz对高频段的隔离,减小波导高度,提高WR.2.8波导截止频率,增加对300 GHz以下频段抑制,为了测试其输出特性和网络损耗,设计170~340 GHz背靠背模块。仿真结果为低通CSMRs滤波器满足在20~180 GHz通带内反射系数小于-18 d B,在266~520 GHz阻带内抑制度大于20 d B,背靠背结构仿真170 GHz与340 GHz频段反射系数均小于-15 d B,端口隔离大于30 d B,表现出良好的选频特性。测试结果表明:在170 GHz端口通带为150~185 GHz,反射系数小于-10 d B,损耗大于1.2 d B;在340 GHz端口,通带为306~355 GHz,反射系数小于-10 d B,损耗2 d B,两端口隔离度大于10 d B,最好60 d B。
