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 inductanceLshort-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.
Highlights
Ultra-wideband (UWB) technology has received significant interests for a lot of applications, for example, nondestructive evaluation (NDE) of highway structures [1], geophysical prospecting, short-range in-building communications [2], vital sign detection [3], and so on
Pulse generators of fixed pulse durations are used. These pulse types have a common characteristic of extremely wide instantaneous bandwidth and can be transmitted without carrier
This design consists of two bipolar junction transistors Q1 (BFG35) and Q2 (BFG31), a wideband linear power amplifier transistor Q3, and energy storage capacitors
Summary
Received 24 July 2014; Revised 26 September 2014; Accepted 7 October 2014; Published 15 December 2014. 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. 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
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