Novel Archimedes screw antenna for stepping frequency ground penetrating radar

Abstract

The invention belongs to the design field of a stepping frequency ground penetrating radar, in particular to an Archimedes screw antenna device for a stepping frequency ground penetrating radar; and the antenna includes a dielectric substrate, an antenna arm, a wave absorbing material, a reflection cavity, a non-balance-balance feed Barren and a coaxial connector, the antenna arm is a square double-arm spiral antenna piece with four corners which are provided with cutting angles, the cutting angle is in an isosceles right triangle shape, the angle of the cutting angle ranges from 0. 5mm to 5 degrees / circle from the center to the outside and the starting angle is not larger than 45 degrees, the square double-arm spiral antenna sheet with the four corners with the cutting angles is loaded with a tail end resistor at the tail end at the minimum working frequency quarter wavelength part away from the tail end of the double arms. The invention realizes a miniaturized, wide-frequency, and high-orientation Archimedes screw antenna for a stepping frequency ground penetrating radar, and the working frequency of the antenna ranges from 250 MHz to 1600 MHz, the size of the antenna is not morethan 300 mm * 300 mm, and the axial ratio is less than 3 dB, the direction graph is good, the gain is not less than 3 dB, and the echo loss S11 is less than 10 dB.

Description

technical field [0001] The invention belongs to the design field of step-frequency ground-penetrating radar, in particular to an Archimedes spiral antenna device for step-frequency ground-penetrating radar. Background technique [0002] Ground-penetrating radar is an efficient geophysical method that uses high-frequency electromagnetic waves with a frequency between 100MHz and 4000MHz to determine the distribution of underground media. Ground-penetrating radar, one is a ground-penetrating radar with a stepping frequency mechanism. Compared with a ground-penetrating radar with a stepping frequency mechanism, a ground-penetrating radar with a time-domain pulse mechanism has obvious advantages in signal processing, but it is difficult to take into account the resolution. and penetration depth, and the ground penetrating radar with step frequency mechanism can take these two points into consideration. [0003] According to the carrying platform, ground penetrating radar is divi...

AI Technical Summary

Problems solved by technology

[0002] Ground-penetrating radar is an efficient geophysical method that uses high-frequency electromagnetic waves with a frequency between 100MHz and 4000MHz to determine the distribution of underground media. Ground-penetrating radar, one is a ground-penetrating radar with a stepping frequency mechanism. Compared with a ground-penetrating radar with a stepping frequency mechanism, a ground-penetrating radar with a time-domain pulse mechanism has obvious advantages in signal processing, but it is difficult to take into account the resolution. and penetration depth, and the ground penetrating radar with step frequency mechanism can take these two points into consideration

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