A Miniaturized Quad-Stopband Frequency Selective Surface with Convoluted and Interdigitated Stripe Based on...

Area of Science:

• Electromagnetics and Microwave Engineering
• Metamaterials and Metasurfaces
• Applied Physics

Background:

• Frequency Selective Surfaces (FSS) are crucial for filtering electromagnetic signals.
• Existing FSS designs often face limitations in miniaturization and bandwidth control.
• The need for compact, multi-band FSS solutions is driven by modern wireless communication systems.

Purpose of the Study:

• To propose and validate a highly miniaturized Frequency Selective Surface (FSS).
• To achieve multiple narrow passbands and wide stopbands across L-, S-, C-, X-, Ku-, and K-bands.
• To investigate the working mechanism and performance characteristics, including angle and polarization stability.

Main Methods:

• Design of a miniaturized FSS utilizing convoluted and interdigitated stripe elements.
• Development of an equivalent circuit model to explain the FSS operational principles.
• Electromagnetic simulation and experimental fabrication/measurement of an FSS prototype.

Main Results:

• The proposed FSS exhibits four distinct transmission band rejections (3 dB) within specific frequency ranges: 1-6.65 GHz, 8.35-16.9 GHz, 18.0-24 GHz, and 24.50-27.84 GHz.
• Achieved a unit cell size of 0.09λ₀ × 0.09λ₀, demonstrating significant miniaturization.
• Demonstrated good angular stability (up to 60°) and polarization stability.
• Experimental results closely matched simulation predictions.

Conclusions:

• The convoluted and interdigitated stripe FSS design effectively maximizes spatial efficiency for high miniaturization.
• The proposed FSS provides a versatile multi-band filtering solution with robust stability.
• The validated design is suitable for practical applications in radomes, antenna reflectors, and spatial filters.