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Polarization-insensitive planar patch antenna with large embedded serial capacitance for on-metal tag design.

Muthukannan Murugesh¹, Eng-Hock Lim², Pei-Song Chee³

¹Department of Electrical and Electronic Engineering, Universiti Tunku Abdul Rahman, 43000, Kajang, Malaysia.

Scientific Reports

|May 11, 2023

Summary

A novel polarization-insensitive planar patch antenna is introduced for metal mountable tags. This single radiator design achieves omnidirectional readability, even on metallic surfaces, enhancing tag performance.

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Area of Science:

Electrical Engineering
Antenna Theory
Radio-Frequency Engineering

Background:

Metal mountable tags require robust antenna designs for reliable communication.
Existing antennas often struggle with polarization sensitivity and performance degradation on metallic surfaces.

Purpose of the Study:

To propose a polarization-insensitive planar patch antenna for metal mountable tags.
To achieve omnidirectional readability and reduce resonant frequency using a single radiator.

Main Methods:

Designing a planar patch antenna with closely overlapped flaps to create a large embedded serial capacitance.
Analyzing surface currents and constructing an equivalent circuit to understand impedance properties.
Investigating the antenna's performance on metallic surfaces and its insensitivity to backing materials.

Main Results:

The proposed antenna exhibits polarization-insensitivity, enabling readability from almost all directions above a metal surface.
A compact tag antenna was developed, achieving a read range of approximately 15m with 4W EIRP.
The tag's resonant frequency showed minimal impact from the backing material.

Conclusions:

The developed single-radiator planar patch antenna effectively overcomes polarization and metal-surface challenges for tag applications.
This design offers a unique solution for robust and versatile metal mountable tags.
The antenna's performance characteristics suggest significant advancements in RFID and sensor tag technology.