A Wide Passband Frequency-Selective Surface with a Sharp Roll-Off Band Using the Filtering Antenna-Filtering Antenna...

Area of Science:

• Electromagnetics and Metamaterials
• Antenna Theory and Design
• Microwave Engineering

Background:

• Frequency-selective surfaces (FSSs) are crucial for manipulating electromagnetic wave transmission.
• Existing FSS designs often struggle to achieve both wide passbands and sharp roll-off characteristics simultaneously.
• Metasurfaces offer advanced control over electromagnetic properties, enabling novel FSS designs.

Purpose of the Study:

• To design and demonstrate a novel filtering antenna-filtering antenna (FA-FA) FSS.
• To achieve a wide passband with sharp, double-side roll-off characteristics.
• To validate the performance through simulation and experimental measurement.

Main Methods:

• A dual-polarized filtering antenna element was designed using a parasitic band-stop structure and L-probe feed.
• The FA-FA FSS unit was constructed by connecting two filtering antenna elements back-to-back via metallic vias.
• Periodic arraying of FA-FA units was employed to realize the final FSS structure.

Main Results:

• The FA-FA FSS exhibited a wide passband from 13.06 GHz to 14.46 GHz with a flat in-band response.
• Sharp lower and upper roll-off bandwidths were achieved, at 1% and 1.2% of the center frequency, respectively.
• Simulations and measurements confirmed the predicted performance, including the sharp double-side roll-off feature.

Conclusions:

• The proposed FA-FA FSS successfully integrates filtering antenna elements to create a high-performance frequency-selective surface.
• The design achieves a desirable combination of a wide passband and high selectivity (sharp roll-off).
• This FSS is suitable for diverse applications, including antenna arrays, metasurfaces, and communication systems.