A Design Method and Application of Meta-Surface-Based Arbitrary Passband Filter for Terahertz Communication

Area of Science:

• Electromagnetics and Applied Physics
• Materials Science
• Electrical Engineering

Background:

• Designing arbitrary bandwidth filters for terahertz (THz) communications is complex, often facing challenges with impedance matching.
• Existing filter designs struggle to meet the demands of future wireless communication systems requiring precise frequency control.

Purpose of the Study:

• To present a new meta-surface-based method for realizing arbitrary bandwidth filters for THz communications.
• To simplify the design process and overcome impedance matching issues inherent in traditional filter realization.

Main Methods:

• Integrated a meta-surface bandstop filter with an ultra-wideband (UWB) bandpass filter, tuning the bandstop range to achieve arbitrary bandwidths.
• Utilized silicon substrate integrated gap waveguide (SSIGW) technology for practical THz filter fabrication.
• Developed design equations for electromagnetic band gap (EBG) structures compatible with through-silicon via (TSV) and employed equivalent transmission line and circuit models for analysis.

Main Results:

• The proposed THz filter operates at a center frequency of 0.151 THz with a relative bandwidth of 6.9%.
• Achieved low insertion loss (< 0.68 dB) and wide stopbands (> 20 GHz).
• Demonstrated a minimal in-band group delay of 0.119 ± 0.048 ns.

Conclusions:

• The meta-surface-based method offers a practical and effective solution for arbitrary bandwidth filter design in THz systems.
• The developed SSIGW THz filter exhibits superior low loss and minimal delay characteristics compared to existing THz filters.
• This advancement is highly suitable for enhancing future wireless communication technologies.