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Gain and Bandwidth Enhancement of 3D-Printed Short Backfire Antennas Using Rim Flaring and Iris Matching.

Yewande Mariam Aragbaiye¹, Dustin Isleifson^1,2

¹Department of Electrical & Computer Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada.

Sensors (Basel, Switzerland)

|April 27, 2024

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New design techniques for short backfire antennas significantly boost gain and bandwidth. Flaring the antenna rim and adding an inductive iris achieved a 66% impedance bandwidth and 17.2 dBi gain, with 3D printing reducing mass.

Area of Science:

Antenna Engineering
Electromagnetics
Microwave Engineering

Background:

Short backfire antennas (SBFs) are widely used but often suffer from limited gain and impedance bandwidth.
Enhancing SBF performance is crucial for advanced communication and radar systems.

Purpose of the Study:

To introduce novel design techniques for improving the gain and impedance bandwidth of SBFs.
To investigate the impact of geometrical modifications on SBF performance.
To demonstrate a lightweight fabrication method for SBFs.

Main Methods:

Parametric studies were conducted to optimize the flaring angle of the antenna rim for gain enhancement.
An inductive iris was incorporated at the waveguide aperture to further improve impedance matching and bandwidth.

Keywords:

3D printing flare gain enhancement iris short backfire antenna wideband antenna

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Prototypes were fabricated using a 3D-printing technique and experimentally validated.

Main Results:

Flaring the antenna rim increased peak realized gain to 17.2 dBi and impedance bandwidth to 55%.
Adding an inductive iris further improved performance, achieving 17.1 dBi gain and a 66% impedance bandwidth.
Experimental results showed good agreement with simulations, confirming the effectiveness of the design modifications.

Conclusions:

Optimized geometrical modifications of the SBF structure are effective in enhancing both gain and bandwidth.
The proposed design techniques offer a significant improvement over conventional SBF designs.
The 3D-printed fabrication method provides a mass-efficient alternative to traditional metallic structures.