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A Compact Dual-Polarized Vivaldi Antenna with High Gain for Tree Radar Applications.

Kaixuan Cheng¹, Yee Hui Lee¹, Jiwei Qian¹

¹School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Ave., Singapore 639798, Singapore.

Sensors (Basel, Switzerland)

|July 13, 2024

Summary

A novel dual-polarized Vivaldi antenna array offers high gain for tree radar applications. This antenna design improves defect imaging in tree trunks compared to traditional horn antennas.

Keywords:

Vivaldi antenna dual-polarization antenna ground-penetrating radar (GPR)high gain tree radar ultra-wide bandwidth

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Area of Science:

Electrical Engineering
Electromagnetics
Antenna Theory

Background:

Tree radar applications require antennas with specific performance characteristics for effective subsurface imaging.
Existing antenna designs may not offer the optimal combination of bandwidth, gain, and polarization for tree defect detection.

Purpose of the Study:

To propose and validate a dual-polarized compact Vivaldi antenna array for enhanced tree radar applications.
To achieve high gain, broad bandwidth, and high polarization purity for improved defect detection.

Main Methods:

Design of a dual-polarized Vivaldi antenna array using directors, edge slots, and a back reflector to enhance gain.
Fabrication and measurement of the proposed antenna to evaluate its performance characteristics.
Application of the antenna in tree trunk defect detection and imaging.

Main Results:

The fabricated antenna achieved a high gain of 5.5 to 14.8 dBi over a broadband frequency range (0.5 GHz to 3 GHz).
Cross-polarization discrimination exceeded 20 dB, ensuring high polarization purity.
The antenna produced a superior migrated image of tree trunk defects compared to a commercial Horn antenna.

Conclusions:

The proposed dual-polarized Vivaldi antenna array is effective for tree radar applications.
The antenna design offers significant improvements in gain, bandwidth, and imaging quality for detecting internal tree defects.