Non-foster broadband matching networks for electrically-small antennas

Ivanov, Nikolay; Buyantuev, Bair; Turgaliev, Viacheslav; Kholodnyak, Dmitry

doi:10.1109/lapc.2016.7807596

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…반면, 그림 1(b)와 같이 음의 인덕턴스 또는 캐패시 턴스를 이용하는 비-포스터 정합의 경우 넓은 주파수 대 역에서 리엑턴스를 보상할 수 있다. 최근 소형 안테나의 이득-대역폭 제한을 극복하기 위해 비-포스터 정합을 적용하는 연구가 눈에 띄게 늘어났으나, 많은 경우 안테나의 반사계수 개선값만을 제시한다 [6]～ [8] . 하지만 비-포스터 회로에 의한 반사계수 개선이 안테나 시스템의 성능개선(예: 수신전력)에 직접적으로 영향이 있는지에 대한 연구는 많이 이루어지지 않고 있다.…”

Section: ⅰ 서 론unclassified

Non-Foster Circuit Design for Broadband Matching and Receiver Power Enhancement of Electrically Small Antennas

Lee¹,

Chung²

2019

J. Korean Inst. Electromagn. Eng. Sci.

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In this paper, we describe the design, fabrication, and measurement results of a non-Foster circuit for improving the wideband matching and receiver power of small antennas. The antennas under consideration are a small monopole antenna and a small inverted F antenna. These antennas experience excessive C and L respectively; which makes it difficult to match their wideband impedance performance. To cancel out the excess C, a negative C non-Foster circuit is designed whereas a negative L non-Foster circuit is designed to cancel out the excess L. An important factor in the design of a non-Foster circuit is the stability, which is obtained by simultaneously considering the open circuit stability condition and transient response. According to the simulation, the optimized non-Foster circuit operates with negative C and L at 100～500 MHz, and it is fabricated with a PCB process and applied to the antennas. The reflection coefficients of the small monopole antenna and the inverted F antenna with non-Foster circuits are less than −10 dB at 150～400 MHz and 220～330 MHz, respectively. In addition, we measured the receiver power using antennas with non-Foster circuits. The small monopole antenna improved by 10.3 dB on average while the small inverted F antenna improved by 7.5 dB, at this frequency band.

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Section: ⅰ 서 론unclassified

Non-Foster Circuit Design for Broadband Matching and Receiver Power Enhancement of Electrically Small Antennas

Lee¹,

Chung²

2019

J. Korean Inst. Electromagn. Eng. Sci.

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“…It generates a negative C (or L), which is against the Foster's reactance theorem, and thus a broad reactance cancellation bandwidth can be achieved. Various non-Foster circuit designs have been reported for the broadband matching of small antennas [6][7][8][9][10][11]. However, most of them presented only the enhancement in the antenna's reflection coefficient (S 11 ) after applying the NFC, which is not sufficient to validate the system-wide improvement.…”

Section: Introductionmentioning

confidence: 99%

SNR Enhancement of an Electrically Small Antenna Using a Non-Foster Matching Circuit

2020

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A non-Foster circuit (NFC) is known as an active broadband matching technique to improve the impedance matching bandwidth of an electrically small antenna (ESA). There has been a vast amount of papers that report the generation of negative impedance using an NFC and its effectiveness on broadband antenna matching. However, only a few discussed its impact on the signal-to-noise-ratio (SNR), which is one of the most important figures-of-merit for a wireless communication system. In this paper, the SNR enhancement due to an NFC was measured and discussed. An NFC was carefully designed to have a low dissipation loss and to meet the stability conditions. The optimized NFC design was fabricated and applied to an ESA length of λ⁄15 at a frequency range of 150 to 300 MHz. The measured results showed that the NFC enhanced the received power of the antenna system by more than 17 dB. However, due to the noise added by the NFC, the SNR enhancement was not guaranteed for some frequency points. Nevertheless, an average of 7.3 dB of SNR improvement over the frequency band of interest is possible based on the experiment result.

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Methodology for broadband matching of electrically small antenna using combined non-Foster and passive networks

Almokdad

Lababidi

Roy

et al. 2020

Analog Integr Circ Sig Process

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Non-foster broadband matching networks for electrically-small antennas

Cited by 10 publications

References 13 publications

Non-Foster Circuit Design for Broadband Matching and Receiver Power Enhancement of Electrically Small Antennas

Non-Foster Circuit Design for Broadband Matching and Receiver Power Enhancement of Electrically Small Antennas

SNR Enhancement of an Electrically Small Antenna Using a Non-Foster Matching Circuit

Methodology for broadband matching of electrically small antenna using combined non-Foster and passive networks

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