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Journal of Sensors
Volume 2014 (2014), Article ID 150549, 4 pages
http://dx.doi.org/10.1155/2014/150549
Research Article

A Novel Subnanosecond Monocycle Pulse Generator for UWB Radar Applications

1Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, No. 19, North 4th Ring Road West, Haidian District, Beijing 100190, China
2University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
3Chinese Academy of Sciences, 52 Sanlihe Road, Beijing 100864, China

Received 24 July 2014; Revised 26 September 2014; Accepted 7 October 2014; Published 15 December 2014

Academic Editor: Aaron T. Ohta

Copyright © 2014 Xinfan Xia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel ultra-wideband (UWB) monocycle pulse generator with good performance is designed and demonstrated in this paper. It contains a power supply circuit, a pulse drive circuit, a unique pulse forming circuit, and a novel monopolar-to-monocycle pulse transition circuit. The drive circuit employs wideband bipolar junction transistors (BJTs) and linear power amplifier transistor to produce a high amplitude drive pulse, and the pulse forming circuit uses the transition characteristics of step recovery diode (SRD) effectively to produce a negative narrow pulse. At last, the monocycle pulse forming circuit utilizes a novel inductance L short-circuited stub to generate the monocycle pulse directly. Measurement results show that the waveform of the generated monocycle pulses is over 76 V in peak-to-peak amplitude and 3.2 ns in pulse full-width. These characteristics of the monocycle pulse are advantageous for obtaining long detection range and high resolution, when it is applied to ultra-wideband radar applications.