Design circular polarized antenna at ISM band for WBAN using parasitic elements

Area of Science:

• Electrical Engineering
• Electromagnetics
• Antenna Theory

Background:

• Circularly polarized antennas are crucial for wireless communication systems, especially in biomedical applications requiring stable signal transmission.
• Conventional antennas often face limitations in bandwidth and gain, necessitating innovative design approaches.

Purpose of the Study:

• To design and validate a single-layer, wideband, circular polarized (CP) antenna with high broadside gain.
• To enhance antenna bandwidth and gain using parasitic elements and characteristic mode analysis (CMA).

Main Methods:

• The antenna design utilizes an elliptical patch with eight parasitic elements on the same plane.
• Characteristic Mode Analysis (CMA) was employed for mode analysis and antenna optimization.
• Full-wave electromagnetic (EM) simulation and equivalent circuit model (ECM) analysis were performed.
• A prototype was fabricated on FR4 material for experimental validation.

Main Results:

• The optimized antenna exhibits a wide operating frequency band from 5485 to 6130 MHz (|S11| < -10 dB).
• The 3-dB axial ratio (AR) bandwidth is achieved between 5680 and 5900 MHz.
• The fabricated antenna demonstrates a high gain of 7-7.05 dBi within the ISM band, suitable for biomedical applications.

Conclusions:

• The proposed antenna design effectively enhances bandwidth and broadside gain through the strategic use of parasitic elements and CMA optimization.
• The design demonstrates practical feasibility and suitability for biomedical applications within the ISM band due to its high gain and CP characteristics.