Abstract
In this communication, a fully metallic doubly corrugated parallel-plate waveguide (DCPPW)-based leaky-wave antenna (LWA) with backfire-to-forward beam scanning (BTF BS), high scanning rate, and high radiation efficiency is presented. The DCPPW is introduced into the design of LWAs as the slow-wave transmission line (SW-TL), enabling high scanning rate for its high-dispersion characteristics. The periodic transverse modulation slots are loaded on the upper plate of the SW-TL to stimulate higher spatial harmonics, and, further, generate leaky-wave radiation. In order to obtain BTF BS, theoretical conditions are proposed for dispersion characteristics of the DCPPW and the modulation period. The grooves under each modulation slot are designed with different depths to suppress the open stopband (OSB) effect. Both ends of the antenna are designed as slopes to correct the beam deflection near the backfire region. A continuous BS from -90° to +11° is obtained within the operating band of 26.5 GHz - 40 GHz, which indicates a 2.49°/%BW scanning rate. The peak gain varies smoothly from 13.5 to 18.8 dBi with the increase of frequency, and the radiation efficiency is above 90% within the band of 27.1 GHz - 40 GHz (95.6% of the operating bandwidth). The proposed LWA can perform with advantages of BTF BS, high scanning rate and high radiation efficiency, showing a potential to be applied in the millimeter-wave (mmW) imaging and radar systems.
| Original language | English |
|---|---|
| Number of pages | 6 |
| Journal | IEEE Transactions on Antennas and Propagation |
| Early online date | 28 Feb 2025 |
| DOIs | |
| Publication status | E-pub ahead of print - 28 Feb 2025 |
Bibliographical note
Publisher Copyright:© 2025 IEEE.
Keywords
- Backfire-to-forward (BTF) coverage
- beam scanning (BS)
- fully metallic structure
- leaky-wave antenna (LWA)
- millimeter-wave (mmW)
- scanning rate
ASJC Scopus subject areas
- Electrical and Electronic Engineering