Measurement of Tunnel Diode Negative Resistance

Todd, Carl David

doi:10.1063/1.1717358

Cited by 4 publications

(2 citation statements)

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“…The negative differential resistance (NDR) at microwave frequencies is offered by the quantum tunnelling semiconductor devices, which is realized by General Electric’s TD261A3031. The NDR can be equivalently considered as a negative resistance − R d , acting as a current source linearly controlled by an applied voltage which is shown as in Fig.…”

Section: Resultsmentioning

confidence: 99%

Unidirectional invisibility induced by parity-time symmetric circuit

et al. 2017

Sci Rep

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Parity-time (PT) symmetric structures present the unidirectional invisibility at the spontaneous PT-symmetry breaking point. In this paper, we propose a PT-symmetric circuit consisting of a resistor and a microwave tunnel diode (TD) which represent the attenuation and amplification, respectively. Based on the scattering matrix method, the circuit can exhibit an ideal unidirectional performance at the spontaneous PT-symmetry breaking point by tuning the transmission lines between the lumped elements. Additionally, the resistance of the reactance component can alter the bandwidth of the unidirectional invisibility flexibly. Furthermore, the electromagnetic simulation for the proposed circuit validates the unidirectional invisibility and the synchronization with the input energy well. Our work not only provides an unidirectional invisible circuit based on PT-symmetry, but also proposes a potential solution for the extremely selective filter or cloaking applications.

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Section: Resultsmentioning

confidence: 99%

Unidirectional invisibility induced by parity-time symmetric circuit

et al. 2017

Sci Rep

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“…1. TDs are quantum tunnelling semiconductor devices capable of offering a negative differential resistance (NDR) at microwave frequencies 6,26 . This NDR can be equivalently considered as a negative resistance À R d , acting as a current source linearly controlled by an applied voltage.…”

Section: Resultsmentioning

confidence: 99%

Microwave gain medium with negative refractive index

Chang

Ran

et al. 2014

Nat Commun

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Artificial effective media are attractive because of the fantastic applications they may enable, such as super lensing and electromagnetic invisibility. However, the inevitable loss due to their strongly dispersive nature is one of the fundamental challenges preventing such applications from becoming a reality. In this study, we demonstrate an effective gain medium based on negative resistance, to overcompensate the loss of a conventional passive metamaterial, meanwhile keeping its original negative-index property. Energy conservation-based theory, full-wave simulation and experimental measurement show that a fabricated sample consisting of conventional sub-wavelength building blocks with embedded microwave tunnel diodes exhibits a band-limited Lorentzian dispersion simultaneously with a negative refractive index and a net gain. Our work provides experimental evidence to the assertion that a stable net gain in negative-index gain medium is achievable, proposing a potential solution for the critical challenge current metamateiral technology faces in practical applications.

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1977

Tunnelling and Negative Resistance Phenomena in Semiconductors

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Measurement of Tunnel Diode Negative Resistance

Cited by 4 publications

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Unidirectional invisibility induced by parity-time symmetric circuit

Unidirectional invisibility induced by parity-time symmetric circuit

Microwave gain medium with negative refractive index

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