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H-plane horn antenna with enhanced directivity using conformal transformation optics
Hossein Eskandari1, Juan Luis Albadalejo-Lijarcio2, Oskar Zetterstrom2
1Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran. Hossein.skandari@gmail.com.
Scientific Reports
|July 13, 2021
Summary
This study enhances H-plane horn directivity using conformal transformation optics and a graded-index lens. The novel design achieves a low-profile, high-gain lens antenna with improved performance.
Area of Science:
- Electromagnetics and Optics
- Antenna Theory and Design
Background:
- H-plane horn antennas are widely used but can have limitations in directivity.
- Enhancing antenna gain and directivity often requires complex or bulky designs.
Purpose of the Study:
- To improve the directivity of an H-plane horn antenna.
- To design a low-profile, high-gain lens antenna using conformal transformation optics.
Main Methods:
- Conformal transformation optics was employed to design a graded-index all-dielectric lens.
- The lens design gradually eliminates phase error at the aperture.
- Physical space modification avoided singular index values and superluminal regions.
Main Results:
- A prototype lens antenna was fabricated using 3D printing.
- Measurements demonstrated a realized gain improvement of 1.5-2.4 dB for the H-plane horn.
- The designed lens resulted in a low-profile, high-gain antenna.
Conclusions:
- Conformal transformation optics is an effective method for enhancing H-plane horn directivity.
- The graded-index all-dielectric lens offers a practical solution for high-gain, low-profile antennas.
- The fabricated prototype validates the theoretical design and demonstrates significant gain improvement.
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