Dispersion-boosting wideband electromagnetic transparency under extreme angles for TE-polarized waves

Area of Science:

• Electromagnetics
• Materials Science
• Wave Phenomena

Background:

• Half-wave walls are common for electromagnetic (EM) transparency, but suffer from limited bandwidth, especially at extreme incident angles.
• Existing methods rely on wave interference, creating transmission windows sensitive to frequency and angle.

Purpose of the Study:

• To extend the bandwidth of transmission windows in half-wave walls under extreme incident angles.
• To achieve wideband electromagnetic transparency without increasing physical thickness.

Main Methods:

• Embedding long metallic wires into a half-wave wall matrix to induce dispersion.
• Utilizing the plasma-like behavior of metallic wires to create a nonlinear, frequency-dependent effective permittivity.
• Tailoring the dispersion to merge multiple transmission windows.

Main Results:

• The proposed method generates an additional transmission window and brings existing windows closer.
• A prototype demonstrated operation across the entire Ku-band for TE-polarized waves at incident angles from 70° to 85°.
• Simulated and measured results confirm the effectiveness of the dispersion strategy.

Conclusions:

• The integration of metallic wires provides a viable strategy for wideband EM transparency under extreme angles.
• This approach offers potential applications in radar, communications, and other fields requiring robust EM wave control.