Adjustable chiral unit, metamaterial and application method based on pin diode

The invention relates to a tunable chiral electromagnetic supermaterial based on a PIN tube, which is composed of a plurality of chiral units arranged regularly in an orthogonal direction on a sub-wavelength scale. A chiral unit includes machining two open annular metals twisted at an angle to each other on the upper and lower surfaces of a dielectric substrate, which is the main resonant component, A gap is formed in each of the two annular metals, The annular metal is divided into two parts, the PIN diode is welded on the surface of the annular metal, the positive and negative electrodes ofthe PIN diode are respectively connected with two parts of the annular metal, the two parts of the annular metal are connected with a metal strip through a metal connecting line, the metal strip is divided into a positive part and a negative part, and the PIN diode is connected with a power supply through an external connecting line. Adjusting the voltage or current within the range of the breakdown voltage of PIN diode c