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We have demonstrated and characterized the generation of ultra-broadband microwave frequency combs (MFCs) based on a current modulated distributed feedback semiconductor laser (DFB-SL) subject to optical injection, and the comb spacing of MFCs can be tuned easily through adjusting the modulation frequency $\text{f}_{m}$ . For the DFB-SL under only current modulation with modulation frequency $\text{f}_{m }= 1.2$ ...
The Acoustic Vector Sensor can measure both pressure and particle velocity information of acoustic field at a point in space. By using the acoustic pressure and particle velocity information, a single AVS can get the unbiased estimation of target's bearing. But when the phase of each channel is inconsistent, the estimation precision will be badly affected. In order to solve this problem, this paper...
A 60GHz wideband circularly polarized E-shaped patch antenna array is designed using surface micromachining. The E-shaped patch is fully utilized to obtain good circular polarization performance. The antenna array is excited by four-way power divider. The four-way power divider is designed using rectangular micro-coaxial transmission line. The antenna array with the specified size of 12.5mm×5.7mm×0...
Electrical Impedance Tomography is applied to acquire the impedance characteristic, which is correlative with the physiological and pathological status of a body, and reconstruct the images of impedance distribution. Current injection with voltage measurement phantom is widely adopted in the application of biomedical detection. Voltage controlled current source (VCCS) develops an important part and...
This paper presented the design method of a digital-controlled variable voltage source with current monitor function. The hardware of system mainly consists of FPGA, DAC, programmable gain amplifier, current sensing circuit and comparator. By using high-speed analog comparator to convert over-current time to length of digital pulse, the FPGA could monitor the amplitude of current dynamically. In aspect...
This paper presented a high speed data acquisition system for real-time appLication. The hardware of system mainly consists of data acquisition, distribution and storage section. A 3Gsps ultra high-speed ADC is appLied in acquisition section. In distribution section, the original data stream will be distributed into four streams. Each data stream will be stored into one soLid-state storage card which...
A novel rectangular patch antenna was specifically designed using planar-patterned metamaterial concepts. The patterned metal patch and finite ground plane form a coupled capacitive-inductive (C-L) circuit of negative index metamaterial. For the wideband, high efficiency, low loss and low VSWR, the novel type of antenna is used to design meta array, the array still have bandwidth significantly broadened...
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