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Xia Z.,Key Laboratory of Electromagnetic Radiation and Sensing Technology | Xia Z.,University of Chinese Academy of Sciences | Wu S.,Key Laboratory of Electromagnetic Radiation and Sensing Technology | Wu S.,Chinese Academy of Sciences | And 7 more authors.
Proceedings of the 2012 2nd International Conference on Instrumentation and Measurement, Computer, Communication and Control, IMCCC 2012 | Year: 2012

Hardware design methods for MIMO (Multiple-input multiple output) UWB (Ultra wideband) radar are presented. The MIMO-UWB radar system mainly consists of two transmitting antennas, four receiving antennas, two impulse generator, sample-and-hold, AD converter, and data acquisition subsystem base on FPGA. All these modules are designed and realized. Additionally, the designed system supports four equivalent time sampling channels with 50GS/s sample rate. Finally, we proved the feasibility of the designed system through closed-loop testing. © 2012 IEEE. Source


Shao J.,Key Laboratory of Electromagnetic Radiation and Sensing Technology | Shao J.,University of Chinese Academy of Sciences | Xia Z.,Key Laboratory of Electromagnetic Radiation and Sensing Technology | Xia Z.,University of Chinese Academy of Sciences | And 3 more authors.
Journal of Electronics | Year: 2013

In this paper, an Ultra-Wideband (UWB) planar antenna is proposed for the reinforced concrete detection, which consists of a pair of planar waterdrop arms, a microstrip to coplanar parallel-strips transition and a shallow rectangular cavity. In order to overcome the disadvantages of the shallow cavity, some absorbing material is loaded to weaken the narrow-band effect of the cavity and the crosstalk interference. The simulated and measured results show that the proposed antenna has a large bandwidth from 0.48 GHz to 3.6 GHz with Voltage Standing Wave Ratio (VSWR) below 2 and a fractional bandwidth about 200% under the center frequency of 1.6 GHz, directional radiation characteristics and small late-time ringing in the time domain, which can be suitable for nondestructive detection of the reinforced concrete. © 2013 Science Press, Institute of Electronics, CAS and Springer-Verlag Berlin Heidelberg. Source


Chen C.,Key Laboratory of Electromagnetic Radiation and Sensing Technology | Chen C.,University of Chinese Academy of Sciences | Shao J.,Key Laboratory of Electromagnetic Radiation and Sensing Technology | Shao J.,University of Chinese Academy of Sciences | And 3 more authors.
Journal of Electronics | Year: 2014

A novel low-cost 4-element planar array antenna directly fed by a coaxial cable for Ultra-WideBand (UWB) application is presented. The proposed antenna consists of 2×2 bowtie elements and a simple 1:4 power divider feeding network. Compared to the basic bowtie element, the impedance bandwidth of the array antenna has a significant improvement that the low cut-off frequency is extended from 6 GHz of the bowtie element to 2 GHz. The measured results show that the proposed antenna has a large bandwidth of 2 GHz to 11 GHz for Voltage Standing Wave Ratio (VSWR)<2, and exhibits a bidirectional radiation pattern and a modest gain across the operating band and a peak gain of about 9 dBi at 11 GHz. © 2014 Science Press, Institute of Electronics, CAS and Springer-Verlag Berlin Heidelberg. Source


Shao J.,Key Laboratory of Electromagnetic Radiation and Sensing Technology | Shao J.,University of Chinese Academy of Sciences | Liu G.,Key Laboratory of Electromagnetic Radiation and Sensing Technology | Liu G.,University of Chinese Academy of Sciences | And 3 more authors.
Journal of Electronics | Year: 2014

A simple Ultra-WideBand (UWB) exponentially-tapered Transverse ElectroMagnetic (TEM) horn antenna is presented for the asphalt detection based on Ground Penetrating Radar (GPR). In order to reduce the reflections from the antenna aperture, some absorbing material is loaded on the outer surface of the conductor. Comparing with the traditional TEM horn antenna, the proposed antenna has a small size and a large impedance bandwidth. Simulated and measured results show that the proposed TEM horn antenna has a low Voltage Standing Wave Ratio (VSWR) below 2 over the whole band from 0.35 GHz to 12 GHz, good radiation characteristics, and small late-time ringing, which can perfectly meet the requirements of the GPR application. © 2014 Science Press, Institute of Electronics, CAS and Springer-Verlag Berlin Heidelberg. Source

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