Broadband directional dipole antenna for ground penetrating radar

Abstract

The invention discloses a broadband directional dipole antenna for a ground penetrating radar. The broadband directional dipole antenna comprises a dipole antenna body and a semi-enclosed wave-absorbing structure, the wave-absorbing structure is provided with an opening side, the dipole antenna body is arranged in the wave-absorbing structure and located on the opening side, and the dipole antenna body is connected with the wave-absorbing structure through a coaxial feeder line; and the wave-absorbing structure sequentially comprises a microstructure metal unit, a wave-absorbing layer and a transmitting plate from inside to outside, the frequency selection surface of the microstructure metal unit is located on the side close to the dipole antenna body, a micro metal block is laid on the surface of the wave-absorbing layer, and the wave-absorbing layer is bonded to the transmitting plate. The broadband directional dipole antenna is compact in structure, the overall thickness is not larger than 130 mm, the width is not larger than 350 mm, and the length is not larger than 900 m. The broadband directional dipole antenna can be used for an earth surface ground penetrating radar system and can also be used for an airborne ground penetrating radar system.

Description

technical field [0001] The invention relates to the design field of ground penetrating radar, in particular to a broadband directional dipole antenna for ground penetrating radar. Background technique [0002] Ground-penetrating radar is a geophysical method that uses high-frequency electromagnetic waves with a frequency between 25MHz and 4000MHz to reasonably evaluate and speculate the geometric structure, spatial location, and burial depth of underground media. GPR is economical, environmentally friendly, efficient and non-destructive, and can achieve high-resolution imaging. Therefore, it is widely used in engineering inspection, environmental protection, cultural relics and archaeology, disaster rescue, resource detection, hydrology and water conservancy and other fields. The ground penetrating radar works on the surface and needs to transmit detection signals underground. If an omnidirectional antenna is used, not only the energy of the signal transmitted underground is...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the dipole antenna has a narrow working bandwidth and does not have the characteristics of directional radiation, so that the conventional dipole antenna cannot meet the requirements of the antenna performance of the ground penetrating radar, the present invention provides a broadband directional dipole for ground penetrating radar Pole antenna, the antenna working frequency is 140MHz~250MHz, the center frequency point is 195MHz, the time domain waveform has high fidelity, the amplitude ratio of the front and rear radiation waveforms is greater than 10dB, and the thickness is not greater than 13cm

Images