# Low-Profile Spoof Surface Plasmon Polaritons Traveling-Wave Antenna for Endfire Radiation

## TL;DR

This paper introduces a low-profile, high-efficiency SSPPs traveling-wave antenna capable of endfire radiation and beam scanning from 7.5 to 12 GHz, validated through measurements showing 9.2 dBi gain and 96% efficiency.

## Contribution

It presents a novel low-profile SSPPs-based antenna with dual functionality of endfire radiation and beam scanning, optimized for 8 GHz operation.

## Key findings

- Maximum gain of 9.2 dBi at 8 GHz
- Total efficiency of 96% at 8 GHz
- Beam scanning capability from 9 to 12 GHz

## Abstract

This paper proposes a low-profile and highly efficient endfire radiating travelling-wave antenna based on spoof surface plasmon polaritons (SSPPs) transmission line. The aperture is approximately $0.32\lambda_0\times0.01\lambda_0$ where $\lambda_0$ is the space wavelength at the operational frequency 8 GHz. This antenna provides an endfire radiation beam within 7.5-8.5 GHz. The maximum gain and total efficiency reaches 9.2 dBi and $96\%$, respectively. In addition to the endfire operation, it also provides a beam scanning functionality within 9-12 GHz. Measurement results are finally given to validate the proposed SSPPs antenna.