Metasurface loaded multi-port tunable silicon-graphene based THz antenna with LHCP/RHCP characteristics, low-RCS and...

Area of Science:

• Electromagnetics
• Antenna Theory
• Terahertz Technology

Background:

• Traditional antennas often exhibit high radar cross section (RCS) and limited polarization capabilities.
• Achieving polarization diversity and low RCS simultaneously presents a significant design challenge.

Purpose of the Study:

• To design and demonstrate a two-terminal antenna with reduced monostatic RCS (MRCS) and polarization variety.
• To enable efficient operation in the terahertz (THz) frequency regime.

Main Methods:

• Utilized a stair-aperture feed to excite a cylindrical silicon dielectric resonator for circular polarization.
• Implemented a mirror-oriented aperture arrangement between terminals for improved isolation.
• Integrated a frequency selective surface (FSS) based on a split-ring resonator (SRR) to reduce MRCS.

Main Results:

• The antenna operates from 2.45 to 3.35 THz, with circular polarization (3-dB axial ratio) achieved between 2.65 and 3.15 THz.
• Achieved a 30 dB improvement in isolation between the two terminals.
• Reduced the monostatic RCS (MRCS) by approximately 30 dBsm within the operational band.

Conclusions:

• The proposed antenna design effectively reduces RCS and offers polarization diversity.
• The design's broadside radiation and advantageous diversity characteristics make it suitable for THz radar applications.