@inproceedings{036cfefa003c4c6b9e4f23d95a0c1230,
title = "Non-foster circuit for wideband matching of high frequency helical antenna",
abstract = "This paper adopts normalized determined function (NDF) to analyze the stability of a non-Foster matched antenna. A -40 pF negative capacitor is achieved at high frequency (HF). The negative capacitor is connected to the input of a 2-meter height helical antenna for wideband cancellation of the large input reactance of the antenna at HF. Nyquist plots of NDFs are used to evaluate the stability of the non-Foster system with and without the stabilization resistor. The performance of input matching and efficiency improvement by non-Foster matching circuit is measured. The received signal power level can be increased by 20-30 dB from 3 to 13 MHz compared to without matching case, and about 15 dB improvement compared to a commercial well-matched HF antenna.",
keywords = "Electrically small antenna, HF, Non-Foster circuit, Normalized determinant function, Stability analysis, Wideband matching",
author = "Qi Tang and Hao Xin",
note = "Funding Information: This work was supported in part by the AFOSR under grants FA-9550-09-1-0567 and FA-9550-13-1-0209. The authors thank to Ahmed H. Abdelrahman for the helical antenna design and Gitansh Gulati for the support of experiment. Publisher Copyright: {\textcopyright} 2017 IEEE.; 2017 IEEE MTT-S International Microwave Symposium, IMS 2017 ; Conference date: 04-06-2017 Through 09-06-2017",
year = "2017",
month = oct,
day = "4",
doi = "10.1109/MWSYM.2017.8059118",
language = "English (US)",
series = "IEEE MTT-S International Microwave Symposium Digest",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "352--355",
booktitle = "2017 IEEE MTT-S International Microwave Symposium, IMS 2017",
}