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Semicircular Patch-Embedded Vivaldi Antenna for Miniaturized UWB Radar Sensors.

Jungwoo Seo^1,2, Jae Hee Kim³, Jungsuek Oh^1,2

¹Institute of New Media and Communications, Seoul National University, Seoul 08826, Korea.

Sensors (Basel, Switzerland)

|October 27, 2020

Summary

This study introduces a miniaturized Vivaldi antenna with semicircular patches for enhanced low-frequency gain and wider bandwidth. The novel design improves performance over conventional Vivaldi antennas.

Keywords:

Vivaldi antennas miniaturization methods ultrawideband antennas

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Area of Science:

Electromagnetic engineering
Antenna theory and design

Background:

Conventional Vivaldi antennas offer ultrawide bandwidth but exhibit low gain at lower frequencies.
Miniaturized antennas are crucial for modern electronic devices, demanding improved performance characteristics.
Microstrip-to-slot line feeding is a common technique for antenna integration.

Discussion:

A novel Vivaldi antenna topology is proposed, integrating semicircular patch elements along the side edges.
This design manipulates electric field phases to achieve constructive interference at the radiating end, enhancing low-frequency gain.
The embedment of semicircular patches overcomes limitations of traditional slotted topologies for low-band impedance matching.

Key Insights:

The proposed antenna achieves a wider operational bandwidth, spanning from 2.84 to 9.83 GHz.
A significant gain enhancement of 5 dB at the low-frequency band is demonstrated through simulation.
The miniaturized antenna, measuring 45 × 40 × 0.8 mm³, shows excellent agreement between simulated and measured results.

Outlook:

This design offers a promising solution for applications requiring compact, high-performance antennas with ultrawide bandwidth and improved low-frequency gain.
Further research could explore variations in patch geometry and feeding structures for even greater performance optimization.
The findings contribute to the advancement of miniaturized antenna technology for wireless communication systems.