A Variable Negative-Inductance Integrated Circuit at UHF Frequencies

White, Carson R.; May, J.W.; Colburn, J.S.

doi:10.1109/lmwc.2011.2175718

Cited by 60 publications

(29 citation statements)

References 7 publications

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“…Recently, this topology has even been used in an IC to obtain a negative inductance dedicated to AMCs [47]. Since it is a NII (Negative Impedance Inverter), it provides negative inductance /capacitance when it is loaded with a capacitor/inductor.…”

Section: Negative Inductance Based On Gyrator Circuitsmentioning

confidence: 99%

Negative inductance circuits for metamaterial bandwidth enhancement

et al. 2017

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Abstract. Passive metamaterials have yet to be translated into applications on a large scale due in large part to their limited bandwidth. To overcome this limitation many authors have suggested coupling metamaterials to non-Foster circuits. However, up to now, the number of convincing demonstrations based on non-Foster metamaterials has been very limited. This paper intends to clarify why progress has been so slow, i.e., the fundamental difficulty in making a truly broadband and efficient non-Foster metamaterial. To this end, we consider two families of metamaterials, namely Artificial Magnetic Media and Artificial Magnetic Conductors. In both cases, it turns out that bandwidth enhancement requires negative inductance with almost zero resistance. To estimate bandwidth enhancement with actual non-Foster circuits, we consider two classes of such circuits, namely Linvill and gyrator. The issue of stability being critical, both metamaterial families are studied with equivalent circuits that include advanced models of these non-Foster circuits. Conclusions are different for Artificial Magnetic Media coupled to Linvill circuits and Artificial Magnetic Conductors coupled to gyrator circuits. In the first case, requirements for bandwidth enhancement and stability are very hard to meet simultaneously whereas, in the second case, an adjustment of the transistor gain does significantly increase bandwidth.

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Section: Negative Inductance Based On Gyrator Circuitsmentioning

confidence: 99%

Negative inductance circuits for metamaterial bandwidth enhancement

et al. 2017

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“…A superior matching degree can be obtained by tuning the values of C 1 and L 1 slightly. Literature [24] gives the tuning method in HF. A pair of back-toback varactor diodes under different voltage can be used as tunable capacitance, and a turns-changeable self-made magnet bar surrounded by Litz coils can be used as tunable inductance in VLF.…”

Section: Non-foster Matching Network Based On Transistorsmentioning

confidence: 99%

Non-Foster matching network design for VLF receive loop antenna

Yalong

Liu

et al. 2016

IEICE Electron. Express

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A non-Foster matching network of the receive loop antenna is applied to VLF (very low frequency) band in this paper. Based on an open stable negative impedance converter (NIC) by Linvill, a 1 Ã 1 m rectangular loop antenna is equivalent as a two-port network, and the non-Foster matching and optimization are realized by a series tunable negative capacitance and negative inductance. The stability of the non-Foster matching network is analyzed and verified also. The results show that compared with the traditional passive matching network from 15 to 30 kHz, by using the non-Foster matching technique, the receive antenna's input reactance is sufficiently canceled by the negative elements, the −10 dB S 11 fractional bandwidth is improved by 64.9%, the total network's efficiency is improved over most frequency bands.

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“…최 근의 여러 연구 결과는 NIC를 활용하여 ESA의 주파수 특 성을 향상시킬 수 있다는 것을 보여주고 있다. 하지만 주 로 낮은 주파수 대역에서의 응용에 머물고 있다 [7], [8] .…”

Section: 는 회로를 만들 수 있다 이것을 비 포스터 회로(Nfcunclassified

Negative Impedance Converter IC for Non-Foster Matching

Park¹,

Lee²,

Park³

et al. 2015

The Journal of Korean Institute of Electromagnetic Engineering

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In this paper, a negative impedance converter, the key element of non-Foster matching to enhance the bandwidth of matching high Q-factor passive element, is presented. Proposed negative impedance converter is implemented by the topology of Linvill's transistor negative impedance converter circuit. It is hard to forecast the operation of negative impedance circuit, because it is composed of gain element and positive feedback. Therefore the negative impedance circuit is implemented by hybrid type beforehand to check out the feasibility and it is designed by integrated circuit. The integrated circuit is fabricated by commercial 0.18μm SiGe BiCMOS process, and non-Foster matching is observed at 700～960 MHz band by cancelling the target reactance.

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A Variable Negative-Inductance Integrated Circuit at UHF Frequencies

Cited by 60 publications

References 7 publications

Negative inductance circuits for metamaterial bandwidth enhancement

Negative inductance circuits for metamaterial bandwidth enhancement

Non-Foster matching network design for VLF receive loop antenna

Negative Impedance Converter IC for Non-Foster Matching

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