Wideband Electrically-small Vivaldi Antenna Using non-Foster Matching

Donghao Li; Changjiang Deng; Zhewei Fu; Zhiji Deng

doi:10.1109/LAWP.2025.3571904

Wideband Electrically-small Vivaldi Antenna Using non-Foster Matching

Donghao Li, Changjiang Deng^*, Zhewei Fu, Zhiji Deng

^*Corresponding author for this work

School of Integrated Circuits and Electronics

Research output: Contribution to journal › Article › peer-review

Abstract

In this letter, an electrically small Vivaldi antenna using active matching is presented for wideband applications. The structure consists of a passive Vivaldi antenna and a non-Foster circuit that is loaded at the feeding port. By generating equivalent positive and negative capacitances, the two parts can achieve conjugated matching over a wide frequency range, which breaks the Bode-Fano limitation in conventional passive matching. The antenna prototype occupies a small size of 0.012λ_L×0.016λ_L. The measured -10 dB impedance bandwidth ranges from 120 MHz to 930 MHz. Compared to the passive Vivaldi antenna, the proposed active antenna enhances the gain by about 10 dB.

Original language	English
Journal	IEEE Antennas and Wireless Propagation Letters
DOIs	https://doi.org/10.1109/LAWP.2025.3571904
Publication status	Accepted/In press - 2025

Keywords

Electrically small antenna
Vivaldi antenna
active matching
non-Foster circuit
wideband antenna

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10.1109/LAWP.2025.3571904

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title = "Wideband Electrically-small Vivaldi Antenna Using non-Foster Matching",

abstract = "In this letter, an electrically small Vivaldi antenna using active matching is presented for wideband applications. The structure consists of a passive Vivaldi antenna and a non-Foster circuit that is loaded at the feeding port. By generating equivalent positive and negative capacitances, the two parts can achieve conjugated matching over a wide frequency range, which breaks the Bode-Fano limitation in conventional passive matching. The antenna prototype occupies a small size of 0.012λL×0.016λL. The measured -10 dB impedance bandwidth ranges from 120 MHz to 930 MHz. Compared to the passive Vivaldi antenna, the proposed active antenna enhances the gain by about 10 dB.",

keywords = "Electrically small antenna, Vivaldi antenna, active matching, non-Foster circuit, wideband antenna",

author = "Donghao Li and Changjiang Deng and Zhewei Fu and Zhiji Deng",

note = "Publisher Copyright: {\textcopyright} 2002-2011 IEEE.",

year = "2025",

doi = "10.1109/LAWP.2025.3571904",

language = "English",

journal = "IEEE Antennas and Wireless Propagation Letters",

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T1 - Wideband Electrically-small Vivaldi Antenna Using non-Foster Matching

AU - Li, Donghao

AU - Deng, Changjiang

AU - Fu, Zhewei

AU - Deng, Zhiji

PY - 2025

Y1 - 2025

N2 - In this letter, an electrically small Vivaldi antenna using active matching is presented for wideband applications. The structure consists of a passive Vivaldi antenna and a non-Foster circuit that is loaded at the feeding port. By generating equivalent positive and negative capacitances, the two parts can achieve conjugated matching over a wide frequency range, which breaks the Bode-Fano limitation in conventional passive matching. The antenna prototype occupies a small size of 0.012λL×0.016λL. The measured -10 dB impedance bandwidth ranges from 120 MHz to 930 MHz. Compared to the passive Vivaldi antenna, the proposed active antenna enhances the gain by about 10 dB.

AB - In this letter, an electrically small Vivaldi antenna using active matching is presented for wideband applications. The structure consists of a passive Vivaldi antenna and a non-Foster circuit that is loaded at the feeding port. By generating equivalent positive and negative capacitances, the two parts can achieve conjugated matching over a wide frequency range, which breaks the Bode-Fano limitation in conventional passive matching. The antenna prototype occupies a small size of 0.012λL×0.016λL. The measured -10 dB impedance bandwidth ranges from 120 MHz to 930 MHz. Compared to the passive Vivaldi antenna, the proposed active antenna enhances the gain by about 10 dB.

KW - Electrically small antenna

KW - Vivaldi antenna

KW - active matching

KW - non-Foster circuit

KW - wideband antenna

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DO - 10.1109/LAWP.2025.3571904

M3 - Article

AN - SCOPUS:105005884314

SN - 1536-1225

JO - IEEE Antennas and Wireless Propagation Letters

JF - IEEE Antennas and Wireless Propagation Letters

ER -

Wideband Electrically-small Vivaldi Antenna Using non-Foster Matching

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