Gain and Noise Analysis of Non-Foster Matched Antennas

Jacob, Minu M.; Sievenpiper, Daniel F.

doi:10.1109/tap.2016.2617380

Cited by 32 publications

(25 citation statements)

References 9 publications

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“…As a result, we got a higher noise figure and a lower SNR compared to the passive matching case. We used the NF analyzer as Jacob and Sievenpiper [23] and reached a similar conclusion. Thus, the non-Foster loaded antenna does not provide SNR improvement over the passive loaded antenna using a low noise figure receiver in VLF.…”

Section: Snr Measurementsmentioning

confidence: 67%

“…Compared to other methods for securing tunable inductors, such as path-short of spiral inductors [26] and polarity switching of a transformer [27], this approach is programmed and area-efficient. Unlike the previously proposed tunable inductor at nH level [22,23], this inductor can be tuned to mH level, which is suitable for non-Foster matching in VLF.…”

Section: Tunable Inductormentioning

confidence: 99%

“…The test setup is shown in Figure 9(a). When conducting 21 measurement, as the result is not precise to measure 21 in the VLF near field by using the receive and transmit antenna measuring system (referred in reference [23]), we used and to represent the equivalent model of the antenna and let the signal transfer in electronic component;…”

Section: -Parameter Measurementsmentioning

confidence: 99%

“…Previous researchers have presented methods in ultrahigh frequency (UHF) [21,22] and did not address the matching process between the antennas and the tunable NFCs. The third obstacle is the general lack of research on NFC noise and SNR performance; Sussman-Fort and Rudish [5] and Jacob and Sievenpiper [23] provided conflicting results on SNR performance in HF. The present study was to run a noise and gain test on the receiving system to examine the NFC network's SNR performance in VLF.…”

Section: Introductionmentioning

confidence: 99%

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Non-Foster Matching Circuit Design via Tunable Inductor for VLF Receive Loop Antennas

Yan

Liu

et al. 2017

International Journal of Antennas and Propagation

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This paper presents a non-Foster matching circuit (NFC) for very low frequency (VLF) receive loop antennas. A 1 * 1 m VLF receive loop antenna was designed with a CMOS switch-based tunable inductor built into the NFC. The NFC can be applied to different VLF loop antennas by adjusting the number and inductance of the cells in the tunable inductor. A loop antenna was matched to the designed NFC with −10 dB 11 fractional bandwidth, marking a 383% improvement as well as enhanced transducer gain ( 21 ) compared to most bands in passive matching (over 15-30 kHz). The noise and received signal-to-noise ratio (SNR) of the matching network were assessed to find that, with a low noise floor level (4 dB) receiver, the SNR of the passive loaded antenna performs better than the non-Foster loaded antenna in VLF.

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Section: Snr Measurementsmentioning

confidence: 67%

Section: Tunable Inductormentioning

confidence: 99%

Section: -Parameter Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-Foster Matching Circuit Design via Tunable Inductor for VLF Receive Loop Antennas

Yan

Liu

et al. 2017

International Journal of Antennas and Propagation

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“…Non-Foster circuits can overcome the fundamental gain-bandwidth limitation as first described by Wheeler [1] and Chu [2], allowing for the development of applications in superluminal waveguides [3], broadband metamaterials [4], phase shifters [5] and antennas [6][7][8]. The non-Foster circuit can generate a "negative capacitor" or "negative inductor", thus to overcome the capacitance or inductance of the matching antenna.…”

Section: Introductionmentioning

confidence: 99%

Gain and Noise Performance of Non-Foster Matching Circuit for VLF Receiver Loop Antenna

Yan¹,

Liu²,

Dong³

et al. 2018

PIER M

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Abstract-Non-Foster matching circuits are those that can function as negative capacitors or inductors, and can thus overcome the gain-bandwidth limitation of passive matching circuits for antennas. This paper presents a non-Foster matching circuit (NFC) for a very low frequency (VLF) receiver loop antenna. The bandwidth of the antenna was improved by 383%, and the average gain was improved in most bands compared to a passive matching circuit (over 15-30 kHz). In contrast to circuits reported in other publications, the signal to noise ratio (SNR) of the passive matching network performed better than the non-Foster matching network. To analyze this phenomenon, a noise model was developed for the simplified balanced NFC, and noise analysis was conducted between the non-Foster and passive matching networks, which indicates that the non-Foster matching circuits cannot provide a better SNR performance than the passive matching circuits under low noise figure level receiver conditions.

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Non‐Foster Matched Antennas

Jacob

Long

Sievenpiper

2018

Wiley Encyclopedia of Electrical and Electronics Engineering

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Non‐Foster networks are those whose reactance has a negative slope with frequency, and can thus overcome bandwidth limitations of many passive systems using their unique impedance and phase properties. These active circuits can be used to provide broadband matching bandwidths for antennas, exceeding passive matching limitations. The design, simulation, and measurement of non‐Foster matched antennas has been presented to show broadband matching bandwidths. A further analysis of the true performance merit of non‐Foster matched antennas in receive applications and transmit applications has also been presented.

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Gain and Noise Analysis of Non-Foster Matched Antennas

Cited by 32 publications

References 9 publications

Non-Foster Matching Circuit Design via Tunable Inductor for VLF Receive Loop Antennas

Non-Foster Matching Circuit Design via Tunable Inductor for VLF Receive Loop Antennas

Gain and Noise Performance of Non-Foster Matching Circuit for VLF Receiver Loop Antenna

Non‐Foster Matched Antennas

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