@article{Zhao_2021,
title={A tunable broadband bandpass filter based on quarter wavelength resonators},
volume={31},
ISSN={1099-047X},
url={http://dx.doi.org/10.1002/mmce.22721},
DOI={10.1002/mmce.22721},
number={8},
journal={International Journal of RF and Microwave Computer-Aided Engineering},
publisher={Wiley},
author={Zhao,
Fei and Ji,
Laiyun and Zhang,
Zhonghai},
year={2021},
month=apr }