Frequency adjustable artificial magnetic conductor structure and its method for realizing phase modulation screen

Abstract

The invention discloses an artificial magnetic conductor structure with adjustable frequency and a method for realizing a phase modulation screen. The artificial magnetic conductor structure is used as the basic structure, and a DC bias voltage source is used to control the active switch loaded on the artificial magnetic conductor structure. The switching state of the device, so as to control the phase state of the artificial magnetic conductor structure at the operating frequency point, so that the incident electromagnetic wave is in two states of anti-phase reflection and in-phase reflection at the same operating frequency; by periodically changing the DC bias voltage source The value makes the frequency spectrum of the reflected electromagnetic wave shift, so that the detection target can achieve stealth at the working frequency. The frequency-adjustable artificial magnetic conductor structure adopted in the present invention is composed of an artificial magnetic conductor unit and a bias network. It has a simple structure and is easy to process, and overcomes the problems of single implementation mode and difficult dual-polarization scheme in the traditional phase modulation screen. , has good engineering application value.

Description

technical field [0001] The invention relates to a method for realizing a phase modulation screen for concealing electromagnetic waves, and belongs to the technical field of microwave circuits. Background technique [0002] As one of the effective means of detecting targets, radar is very reliable in detecting both aircraft and ground equipment. However, through the use of radar stealth technology, such as improving the shape of the target or loading metamaterial structures, the diffuse scattering of incident electromagnetic waves can be achieved, or the incident electromagnetic waves can be converted into heat by coating stealth materials and loading loss-type circuit simulation absorbing structures, etc. Means, the electromagnetic waves emitted by the radar can be scattered or absorbed by the covering layer, and the RCS (RadarCross Section, radar scattering area) is further reduced, thereby greatly reducing the distance that the target can be detected. In the battlefield, ...

AI Technical Summary

Problems solved by technology

The traditional phase modulation screen is composed of a metal plate, a quarter-wavelength dielectric interlayer and a periodic patch array, with a single form and a thicker thickness

When the frequency of the incident electromagnetic wave is low, the thickness of the phase modulation screen will be very thick, which obviously cannot meet the "thin" requirement of modern radar stealth materials

In addition, the existing phase modulation screens still have the problem of single structure and can only achieve single-polarization "absorption" of electromagnetic waves

[0004] It can be seen from the above that the performance of the existing technology cannot meet the actual needs, and it is difficult to realize a low-profile and multi-polarization phase modulation screen

Images