Performance improvement of an electrically-small loop antenna matched with non-foster negative inductance

Ivanov, Nikolay; Turgaliev, Viacheslav; Kholodnyak, Dmitry

doi:10.1109/mwsym.2017.8059117

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…Second, improved S 11 across a tuning range makes no guarantee of pattern stability. In this regard, the authors note the contribution of [8] highlighting the effect of matching component location on pattern. The authors recommend that designers renew their efforts to conduct radiative assessments of impedance-matched solutions for ESA design, noting particularly that the improvement in ESA S 11 demonstrated in this work was not sufficient to predict the very low realised overall efficiency.…”

Section: A Magnetic Bias Configurationmentioning

confidence: 97%

“…Impedance matching as a means to achieve electrically small antenna operation has been proposed in various works e.g. [8], [9], [10]. The difficulty of impedance matching an ESA structure is increased by the increasing reactance of the structure as electrical size is decreased, reducing the instantaneous bandwidth over which an acceptable match is found [8].…”

Section: B Sub-resonant Impedance Matchingmentioning

confidence: 99%

“…[8], [9], [10]. The difficulty of impedance matching an ESA structure is increased by the increasing reactance of the structure as electrical size is decreased, reducing the instantaneous bandwidth over which an acceptable match is found [8]. Non-Foster matching approaches permit broadening of the bandwidth [8], while tuneable matching can sweep a narrowband response over a broad range [9], potentially allowing recovery from reactive impedance mismatch caused by hand-effect detuning in compact communications terminals [11].…”

Section: B Sub-resonant Impedance Matchingmentioning

confidence: 99%

“…Moreover, the radiation pattern established from matching for an arbitrary frequency can also be overlooked. The work of [8] showed that the emplacement of matching components on the ESA structure can affect the radiation pattern directly, the potential for which was overlooked in e.g. [9] despite including variable loading on the ends of a spiral, creating the potential for direct modification of the current distribution.…”

Section: B Sub-resonant Impedance Matchingmentioning

confidence: 99%

See 3 more Smart Citations

Hexaferrite Substrate Versus Impedance Matching for Tuneable Patch Antenna Miniaturisation

James¹,

Hilton²,

Beach³

2018

12th European Conference on Antennas and Propagation (EuCAP 2018)

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Novel hexaferrite substrates and impedance matching networks are both means to deliver electrically small antennas (ESAs). The performance characteristics of each are often restricted to a discussion on the reflection coefficient S11, without consideration of full radiative characterisation. In this work the radiation efficiency and pattern of a hexaferrite patch ESA and impedance-matched sub-resonant Rogers RT5880 patch were compared. The efficiencies of each technique were found to be low, while the pattern of the sub-resonant patch displayed considerable divergence from the half-wavelength behaviour of the hexaferrite patch. The stability of the magnetically-tuned radiation pattern of the hexaferrite patch was then demonstrated over a tuned bandwidth of 32.1%.

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Section: A Magnetic Bias Configurationmentioning

confidence: 97%

Section: B Sub-resonant Impedance Matchingmentioning

confidence: 99%

Section: B Sub-resonant Impedance Matchingmentioning

confidence: 99%

Section: B Sub-resonant Impedance Matchingmentioning

confidence: 99%

See 2 more Smart Citations

Hexaferrite Substrate Versus Impedance Matching for Tuneable Patch Antenna Miniaturisation

James¹,

Hilton²,

Beach³

2018

12th European Conference on Antennas and Propagation (EuCAP 2018)

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“…The NF reactive elements don't obey Foster's reactance theorem, and thus, they usually work as negative capacitance and inductance. The circuit using NF reactive elements can break the limitation of Bode-Fano law, which makes it widely used in antenna's impedance matching [18]- [24]. Typically, NF reactive elements include the non-Foster capacitor (NFC) with negative capacitance and the non-Foster inductor with negative inductance.…”

Section: Introductionmentioning

confidence: 99%

A Novel Fully Reconfigurable Non Foster Capacitance Using Distributed Negative Group Delay Networks

Zhang

Yang

2019

IEEE Access

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A novel reconfigurable non-Foster capacitance (NFC) using negative group delay (NGD) circuit is presented in this paper. The NGD circuit is based on a multi-order distributed amplifier which is used to achieve both NGD performance and gain compensation. By introducing shunt and series varactors next to trans-conductance transistors in the amplifier, the characteristic impedance, and electric length of transmission lines in the distributed amplifier can be flexibly tuned. As a result, the gain, phase shift, and negative group delay value of the proposed NGD circuit can be easily controlled as desired, and therefore, the scattering parameters S 21 can be adjusted to match with an ideal NFC, resulting in reconfigurable non-Foster capacitance. The working frequency ranges, equivalent negative capacitance value, and connection modes of the NFC be fully reconfigured by appropriately controlling the voltages applied to the varactors. Both simulation and measurement results were given, which agree well with each other. The experimental results show that the NFC value can be tuned from −1.1 to −2.5pF with 1 GHz center frequency and the working frequency can be tuned from 0.7 to 0.8 GHz with −10 pF shunt NFC. INDEX TERMS Reconfigurable non-Foster capacitance, negative group delay, non-Foster reactance.

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Applications of non-foster elements to design advanced RF and microwave devices

Buyantuev

Kholodnyak

2018

2018 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus)

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Performance improvement of an electrically-small loop antenna matched with non-foster negative inductance

Cited by 7 publications

References 6 publications

Hexaferrite Substrate Versus Impedance Matching for Tuneable Patch Antenna Miniaturisation

Hexaferrite Substrate Versus Impedance Matching for Tuneable Patch Antenna Miniaturisation

A Novel Fully Reconfigurable Non Foster Capacitance Using Distributed Negative Group Delay Networks

Applications of non-foster elements to design advanced RF and microwave devices

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