An Archimedes spiral antenna device for airborne ground penetrating radar

Abstract

The invention discloses an Archimedes spiral antenna device for airborne ground-penetrating radar, comprising an antenna, an absorbing cavity and a feeding structure, wherein the antenna is arranged on the absorbing cavity, and the feeding structure is used for electrical connection of the antenna; The antenna is composed of an antenna substrate provided with a double-armed Archimedes spiral antenna piece 3. The antenna substrate is a back-shaped structure in which an inner substrate 1 and an outer substrate 2 are combined, and the relative permittivity of the inner substrate 1 is smaller than that of the outer substrate 2. ; The absorption cavity includes a filler 4 with a relative permittivity close to air, an absorption layer 5 and a metal back cavity 6, and the absorption layer 5 is arranged in the metal back cavity 6 for absorbing the backward radiation of the antenna, filling Material 4 is used to fill the absorption cavity. The invention adopts dielectric substrates with different relative permittivity for different radiation areas of the Archimedes spiral antenna, so that the invention has the characteristics of miniaturization, wide frequency band, high directivity, good waveform and the like.

Description

technical field [0001] The invention relates to the design field of airborne ground-penetrating radar, in particular to an Archimedes spiral antenna device for airborne ground-penetrating radar. Background technique [0002] Ground-penetrating radar is an efficient geophysical method to determine the distribution of underground media by using high-frequency electromagnetic waves with a frequency between 100MHz and 4000MHz. Its main application fields are in environmental assessment, engineering geology, geotechnical engineering, archaeology, hydrogeology, and site selection of high-level radioactive waste storage sites. As an important branch of ground penetrating radar, airborne ground penetrating radar has high resolution, nondestructiveness, high efficiency, strong anti-interference ability, and wide range of detection targets, especially in areas with harsh environments and inaccessible ground personnel. Incomparable advantages of other detection methods. [0003] The ...

AI Technical Summary

Problems solved by technology

Nowadays, two methods are mainly used to realize the miniaturization of the Archimedes spiral antenna: the first is to improve the structure of the antenna to realize the miniaturization of the antenna, and the second is to use a high dielectric constant medium to realize the miniaturization of the antenna, but the relative dielectric If the constant is too high, high-order modes will be excited, which will affect the performance of the antenna

Images