Millimeter wave polarimetric detection radiometer

Abstract

A millimeter wave polarimetric detection radiometer at least includes four layers, which are a cover layer, a first metal layer, a dielectric substrate and a second metal layer from top to bottom. Themillimeter wave polarimetric detection radiometer is characterized in that an upper row of first polarized radiation units and a lower row of second polarized radiation units are arranged on the first metal layer, and the first polarized radiation units and the second polarized radiation units are periodically and regularly arranged. The advantages of the traditional linear polarization and circular polarization in the radiation system are taken into account. The optimal performances of circularly polarized and linearly polarized waves are brought into play through reasonable design, and thecircularly polarized and linearly polarized waves are creatively arranged on the same substrate integrated waveguide. Perfect scanning performance is achieved within the millimeter wave band. The problem that the traditional radiation array needs complex components and a complex structure is solved. The side lobe can be suppressed and the side lobe current can be contained without affecting the directionality. The millimeter wave polarimetric detection radiometer has a good application prospect.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to a polarimeter for target detection. Background technique [0002] With the development of microwave technology, the research of modern microwave technology is entering the millimeter-wave frequency band with more abundant spectrum resources. The current research of millimeter-wave technology has covered many fields such as communication, remote sensing, and medical treatment. Millimeter wave smoke detection technology can use the reflection and refraction characteristics of electromagnetic waves to achieve positioning, tracking, ranging and other functions for the measured target. It has important application value in the fields of meteorology, military and currently popular unmanned driving. [0003] In the earlier existing technologies, the application research on millimeter wave target detection and recognition mainly focused on phased array radar, multi-a...

AI Technical Summary

Problems solved by technology

[0004] Many millimeter-wave detection and identification radiometers proposed by scholars currently use complex slow-wave structures for repeated accumulation or large-scale stacked array settings, which can obtain better gain effects and higher scanning resolution, but are complex The structure of the radiometer is often difficult to integrate, and it is difficult to find after the problem occurs. The method of forced integration in time will compromise the scanning angle and gain stability of the radiometer, and the stable scanning function cannot be realized.

[0005] In addition, there are two polarization standards currently used in target identification signal transmission: linear polarization and circular polarization, using vertical polarization (v) and horizontal polarization (H), left-handed circular polarization (L) and right-handed polarization Circular polarization (R), the attenuation of circularly polarized waves in rain, snow, and the atmosphere is small, the ability to penetrate the ionosphere is strong, and it is not affected by the Faraday effect caused by the magnetic field at the two poles of the earth. It is easy to install and debug (no need to adjust the polarization); It is much easier to manufacture a linearly polarized tuner with better performance than circularly polarized, and its efficiency is higher. The Faraday effect of the linearly polarized frequency band above 10 GHz is very small, and it is widely used in mid-latitude regions. The disadvantage is that the polarization needs to be adjusted.

[0006] Therefore, when many current radiometers are used for polarized radiation, in order to take into account the obtained two types of radiation polarization effects, there are also quite a few multi-polarization radiometer structures, such as choosing to adjust the phase and amplitude of the incoming excitation signal of the incident electromagnetic wave, Realize linearly polarized or circularly polarized radiation, but work is limited to radiation of one polarized electromagnetic wave, and radiometers that list two or more polarizations at the same time have not yet appeared, which limits the identification of different polarized electromagnetic waves space of action

Images