The Experts below are selected from a list of 80670 Experts worldwide ranked by ideXlab platform
Tetsuya Kawanishi - One of the best experts on this subject based on the ideXlab platform.
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Ultra wideband frequency chirp millimetre-wave signal generation using electro-optic modulation
2011 13th International Conference on Transparent Optical Networks, 2011Co-Authors: Tetsuya Kawanishi, Takahide Sakamoto, Atsushi KannoAbstract:We describe ultra wideband frequency control of millimetre-wave and lightwave signals using optical single-sideband modulation. Precise and rapid frequency control can be achieved by digital arbitrary waveform generation and high-speed electro-optic modulation. Frequency multiplication in optical modulators also plays important roles. Ultra-Wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-sideband modulator consisting of two sub Mach-Zehnder interferometers.
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ultra wideband frequency chirp signal generation by using high speed optical frequency control with optical single sideband modulation technique
International Topical Meeting on Microwave Photonics, 2006Co-Authors: Tetsuya Kawanishi, Takahide Sakamoto, Masayuki IzutsuAbstract:By using rapid optical frequency sweep technique, we demonstrated Ultra-Wideband frequency chirp millimeter-wave wave signal generation whose bandwidth was 6.4 GHz. Ultra fast and precise optical frequency sweep was achieved by using single-sideband modulation, where the theoretical limit of resolution due to the uncertainty between time and frequency was almost obtained. Ultra-Wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-single sideband modulator consisting of two sub Mach-Zehnder interferometers.
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Ultra-Wideband frequency chirp signal generation by using high-speed optical frequency control with optical single-sideband modulation technique
2006 International Topical Meeting on Microwave Photonics, 2006Co-Authors: Tetsuya Kawanishi, Takahide Sakamoto, Masayuki IzutsuAbstract:By using rapid optical frequency sweep technique, we demonstrated Ultra-Wideband frequency chirp millimeter-wave signal generation whose bandwidth was 6.4 GHz. Ultra fast and precise optical frequency sweep was achieved by using single-sideband modulation, where the theoretical limit of resolution due to the uncertainty between time and frequency was almost obtained, Ultra-Wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-single sideband modulator consisting of two sub Mach-Zehnder interferometers
Masayuki Izutsu - One of the best experts on this subject based on the ideXlab platform.
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ultra wideband frequency chirp signal generation by using high speed optical frequency control with optical single sideband modulation technique
International Topical Meeting on Microwave Photonics, 2006Co-Authors: Tetsuya Kawanishi, Takahide Sakamoto, Masayuki IzutsuAbstract:By using rapid optical frequency sweep technique, we demonstrated Ultra-Wideband frequency chirp millimeter-wave wave signal generation whose bandwidth was 6.4 GHz. Ultra fast and precise optical frequency sweep was achieved by using single-sideband modulation, where the theoretical limit of resolution due to the uncertainty between time and frequency was almost obtained. Ultra-Wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-single sideband modulator consisting of two sub Mach-Zehnder interferometers.
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Ultra-Wideband frequency chirp signal generation by using high-speed optical frequency control with optical single-sideband modulation technique
2006 International Topical Meeting on Microwave Photonics, 2006Co-Authors: Tetsuya Kawanishi, Takahide Sakamoto, Masayuki IzutsuAbstract:By using rapid optical frequency sweep technique, we demonstrated Ultra-Wideband frequency chirp millimeter-wave signal generation whose bandwidth was 6.4 GHz. Ultra fast and precise optical frequency sweep was achieved by using single-sideband modulation, where the theoretical limit of resolution due to the uncertainty between time and frequency was almost obtained, Ultra-Wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-single sideband modulator consisting of two sub Mach-Zehnder interferometers
Takahide Sakamoto - One of the best experts on this subject based on the ideXlab platform.
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Ultra wideband frequency chirp millimetre-wave signal generation using electro-optic modulation
2011 13th International Conference on Transparent Optical Networks, 2011Co-Authors: Tetsuya Kawanishi, Takahide Sakamoto, Atsushi KannoAbstract:We describe ultra wideband frequency control of millimetre-wave and lightwave signals using optical single-sideband modulation. Precise and rapid frequency control can be achieved by digital arbitrary waveform generation and high-speed electro-optic modulation. Frequency multiplication in optical modulators also plays important roles. Ultra-Wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-sideband modulator consisting of two sub Mach-Zehnder interferometers.
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ultra wideband frequency chirp signal generation by using high speed optical frequency control with optical single sideband modulation technique
International Topical Meeting on Microwave Photonics, 2006Co-Authors: Tetsuya Kawanishi, Takahide Sakamoto, Masayuki IzutsuAbstract:By using rapid optical frequency sweep technique, we demonstrated Ultra-Wideband frequency chirp millimeter-wave wave signal generation whose bandwidth was 6.4 GHz. Ultra fast and precise optical frequency sweep was achieved by using single-sideband modulation, where the theoretical limit of resolution due to the uncertainty between time and frequency was almost obtained. Ultra-Wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-single sideband modulator consisting of two sub Mach-Zehnder interferometers.
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Ultra-Wideband frequency chirp signal generation by using high-speed optical frequency control with optical single-sideband modulation technique
2006 International Topical Meeting on Microwave Photonics, 2006Co-Authors: Tetsuya Kawanishi, Takahide Sakamoto, Masayuki IzutsuAbstract:By using rapid optical frequency sweep technique, we demonstrated Ultra-Wideband frequency chirp millimeter-wave signal generation whose bandwidth was 6.4 GHz. Ultra fast and precise optical frequency sweep was achieved by using single-sideband modulation, where the theoretical limit of resolution due to the uncertainty between time and frequency was almost obtained, Ultra-Wideband frequency chirp signals from 9.6 GHz to 16 GHz, which were generated by using a computer controlled arbitrary waveform generator and a wideband frequency multiplier, were fed to an optical single-single sideband modulator consisting of two sub Mach-Zehnder interferometers
Chun Hsiung Chen - One of the best experts on this subject based on the ideXlab platform.
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compact ultra wideband bandpass filters using composite microstrip coplanar waveguide structure
IEEE Transactions on Microwave Theory and Techniques, 2006Co-Authors: Chun Hsiung ChenAbstract:Compact Ultra-Wideband bandpass filters are proposed based on the composite microstrip-coplanar-waveguide (CPW) structure. In this study, the microstrip-CPW transitions and the CPW shorted stubs are adopted as quasi-lumped-circuit elements for realizing a three-pole high-pass filter prototype. By introducing a cross-coupled capacitance between input and output ports of this high-pass filter and suitably designing the transition stretch stubs, a compact three-pole Ultra-Wideband bandpass filter is implemented with two transmission zeros located close to the passband edges. To further improve the selectivity, two microstrip shorted stubs are added to implement a five-pole Ultra-Wideband bandpass filter with good out-of-band response. Being developed from the quasi-lumped elements, and not from the transmission lines, the proposed Ultra-Wideband filters have sizes more compact than those of the published wideband filters. The proposed Ultra-Wideband filters have the merits of compact size, flat group delay, good insertion/return loss, and good selectivity. Agreement between simulated and measured responses of these filters is demonstrated
Shen Le - One of the best experts on this subject based on the ideXlab platform.
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Modeling and Simulation of Echo Signal of Ultra-Wideband Radio Fuze
2020Co-Authors: Shen LeAbstract:The target signal of Ultra-Wideband radio fuze is always submerged in the noise due to the signal radiation of Ultra-Wideband,surface scattering and target signal frequency of Ultra-Wideband radio fuze. In order to get the echo signal of Ultra-Wideband radio fuze,the target signal mathematical expressions of Ultra-Wideband radio fuze are derived by starting from the diffuse reflection characteristics and multipath effects of Ultra-Wideband signal. The target signal of Ultra-Wideband radio fuze is simulated with the help of time domain analysis and Matlab. The simulation results show that the time for scattered signal returning to the antenna is different because of the distance from fuze antenna to the antenna beam is different,resulting in broadening effect. The broadening effect is more obvious with the increase in height;the amplitude of Ultra-Wideband radio fuze echo signal decreases with the increase in height. The correctness of the model is verified by comparing with the measured waveform.
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Optimization of Ultra-Wideband Radio Antenna
2020Co-Authors: Shen LeAbstract:A new Ultra-Wideband radio antenna is designed for the match of Ultra-Wideband fuze transmitter with antenna bandwidth and power. The feeding point and opening angle of triangular symmetrical dipole antenna are optimized by CST. The results show that the best feeding point of the ultra triangular symmetrical dipole antenna is at the top,and the best opening angle is 60°. The time domain analysis is more suitable for the simulation and optimization of radio antenna by analyzing the voltage standing wave ratio( VSWR),antenna bandwidth,antenna gain and radiation signal amplitude of Ultra-Wideband radio antenna.
