A wideband circularly polarized CPW-fed substrate integrated waveguide based antenna array for ISM band applications

Area of Science:

• Electromagnetics and Microwave Engineering
• Antenna Theory and Design

Background:

• Substrate Integrated Waveguide (SIW) technology offers advantages in miniaturization and integration.
• Circular polarization is crucial for mitigating multipath fading and improving signal integrity in wireless communication systems.
• Industrial, Scientific, and Medical (ISM) bands are critical for a wide range of wireless applications, demanding efficient antenna solutions.

Purpose of the Study:

• To design and validate a compact, circularly polarized, wideband antenna array using SIW technology.
• To achieve efficient performance within the ISM band (specifically around 2.45 GHz).
• To demonstrate the suitability of the proposed antenna for practical wireless communication systems.

Main Methods:

• Utilized a coplanar waveguide (CPW) feeding technique for size reduction.
• Fabricated the antenna on a low-loss Rogers RT6002 substrate (εr = 2.94, tanδ = 0.0012, height = 0.76mm).
• Employed simulation and experimental validation to assess antenna performance.

Main Results:

• Achieved a wide impedance bandwidth covering 2.15 GHz to 3.63 GHz (60.4%).
• Obtained a 3 dB axial ratio bandwidth from 2.19 GHz to 2.51 GHz (13%) around the 2.45 GHz ISM band.
• The miniaturized antenna measures 46.50 × 29 × 0.76 mm³.
• Demonstrated good agreement between simulated and experimental results.

Conclusions:

• The proposed circularly polarized SIW antenna array is compact and wideband.
• It meets the performance requirements for ISM band applications.
• The design shows significant promise for integration into various wireless devices and systems.