Ultra-wideband microstrip dipole antenna array and its pulsed ultra-wideband detection and imaging device

Abstract

The invention discloses a UWB (ultra wide band) microstrip dipole antenna array and a pulse UWB detection imaging device thereof. A plurality of microstrip antenna units are printed on the upper surface of a dielectric slab of the UWB microstrip dipole antenna array; the microstrip antenna units are distributed around an virtual origin in a central symmetry manner on the upper surface of the dielectric slab; center connecting lines of each three adjacent microstrip antenna units form a virtual isosceles triangle. The UWB microstrip dipole antenna array is connected with a front-end control circuit. The front-end control circuit is connected with the digital output end of a UWB receiver through a gaussian pulse source. The front-end control circuit is connected with the analog input end of the UWB receiver through a low-noise small signal amplifier. The control input end of the front-end control circuit is connected with the UWB receiver through a parallel port line. The UWB receiver is connected with an upper computer. The UWB microstrip dipole antenna array realizes simplicity and low cost, has the characteristics of high resolution ratio, simple and compact structure, convenience for carrying and expansion and the like and can rapidly acquire position information of a hidden target.

Description

technical field [0001] The invention belongs to the technical field of pulse ultra-wideband radar, in particular to an ultra-wideband microstrip dipole antenna array and a pulse ultra-wideband detection and imaging device thereof. Background technique [0002] Pulse ultra-wideband radar is a time-domain imaging detection system based on sub-nanosecond pulses. It has good penetration, high resolution, high power efficiency, and high detection rate. It can detect non-metallic obstacles behind or Non-invasive detection, positioning, tracking and state analysis of targets in the medium have attracted widespread attention in the fields of anti-terrorism, rescue, biomedicine, and non-destructive detection. [0003] Although some existing pulse UWB radars have achieved UWB detection and positioning to a certain extent, they still need to be improved in terms of system detection accuracy, implementation cost and difficulty. The main reason is that the time domain characteristics of ...

AI Technical Summary

Problems solved by technology

[0003] Although some existing pulse UWB radars have achieved UWB detection and positioning to a certain extent, they still need to be improved in terms of system detection accuracy, implementation cost and difficulty. The main reason is that the time domain characteristics of pulse UWB radar antennas And the corresponding detection methods directly affect the performance of the entire system, and in special environments, handheld devices not only require pulsed ultra-wideband radars to have higher resolution, but also require the overall structure of the system to be compact and easy to carry and unfold, so the antenna size should not be too large

At present, the commonly used antenna forms of ultra-wideband radar mainly include horn antenna, Vivaldi antenna and dipole antenna. The size of a single antenna is relatively large, and the aperture is relatively small. Although the system can achieve good distance resolution, due to the limitation of the antenna aperture, Unsatisfactory azimuth resolution

The synthetic aperture method is used to collect echo information in different azimuths by moving the antenna in time division. Although the azimuth resolution can be improved, the echo of the moving target cannot be synthesized, and the moving position of the antenna is required to be precisely controlled. The whole process is complicated and time-consuming, especially It is difficult to realize under special circumstances

By increasing the number of transmitting and receiving antennas to expand the aperture, although the azimuth resolution can be improved to a certain extent, and the ability to detect moving targets is also available, but the direct consequence of the increase in the number of antennas is that the system is bulky and cumbersome, making it difficult for handheld applications.

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