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Dual-Port Butterfly Slot Antenna for Biosensing Applications.

Marija Milijic¹, Branka Jokanovic^2,3, Miodrag Tasic⁴

¹The Faculty of Electronic Engineering, University of Nis, 18000 Nis, Serbia.

Sensors (Basel, Switzerland)

|August 28, 2025

Summary

This summary is machine-generated.

This study introduces a novel, low-cost, dual-polarized slot antenna for biomedical radar. Its unique design offers high port isolation and simple fabrication for advanced biosensing applications.

Keywords:

butterfly slot antenna coplanar waveguide transmission line double-port antenna microstrip feed line

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Area of Science:

Electrical Engineering
Biomedical Engineering
Antenna Theory

Background:

Microwave biomedical radars require efficient antennas for sensing applications.
Existing dual-port, dual-polarized antennas often face challenges in cost, complexity, and performance.

Purpose of the Study:

To present a novel, low-cost, dual-port, dual-polarized slot antenna design.
To enable full-duplex, in-band operation for microwave biomedical radar systems.
To demonstrate a simple and scalable antenna solution for high-gain biosensing.

Main Methods:

The antenna features a butterfly-shaped radiating element for dual polarization.
Two distinct ports (CPW and microstrip) are integrated for transmit/receive functionality.
Simulations were performed, followed by fabrication and testing of prototypes.

Main Results:

The antenna operates from 2.35 GHz to 2.55 GHz with reflection coefficients below -10 dB.
Achieved maximum gain of 8.5 dBi and a front-to-back gain ratio exceeding 15 dB.
Demonstrated high port isolation (25 dB) and straightforward scalability.

Conclusions:

The proposed antenna design is a simple, cost-effective solution for dual-polarized, dual-port applications.
It offers excellent performance characteristics suitable for microwave biomedical radar and biosensing.
The design's simplicity and scalability make it adaptable for various frequency bands and applications.