Wide frequency‐tunable resonant tunnelling diode terahertz oscillators using varactor diodes

Kitagawa, Seiichirou; Suzuki, Safumi; Asada, Masahiro

doi:10.1049/el.2015.3921

Cited by 26 publications

(16 citation statements)

References 12 publications

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“…45,46 For this reason, terahertz communications links can provide data rates of several tens of Gbps, and this has been confirmed by numerous practical experiments. 11,[47][48][49][50][51][52][53] However, due to the increasing free-space path loss at terahertz frequencies and above, terahertz links must waste as little power as possible in order to achieve adequate signal power over a useful propagation distance. For this reason, terahertz communications must minimize the amount of power that is projected into the directions in which it will not be received.…”

Section: Introductionmentioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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The terahertz range possesses significant untapped potential for applications including high-volume wireless communications, noninvasive medical imaging, sensing, and safe security screening. However, due to the unique characteristics and constraints of terahertz waves, the vast majority of these applications are entirely dependent upon the availability of beam control techniques. Thus, the development of advanced terahertz-range beam control techniques yields a range of useful and unparalleled applications. This article provides an overview and tutorial on terahertz beam control. The underlying principles of wavefront engineering include array antenna theory and diffraction optics, which are drawn from the neighboring microwave and optical regimes, respectively. As both principles are applicable across the electromagnetic spectrum, they are reconciled in this overview. This provides a useful foundation for investigations into beam control in the terahertz range, which lies between microwaves and infrared light. Thereafter, noteworthy experimental demonstrations of beam control in the terahertz range are discussed, and these include geometric optics, phased array devices, leaky-wave antennas, reflectarrays, and transmitarrays. These techniques are compared and contrasted for their suitability in applications of terahertz waves.

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Section: Introductionmentioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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“…Recently, more complex RTD oscillators have been demonstrated, where an additional varactor diode has been built into an oscillator. The tuning range of a single oscillator was ≈ 10-20% and ≈ 40% for an integrated four-element array of oscillators [41,93,94].…”

Section: Characteristics Of Rtd Oscillators and Their Applicationsmentioning

confidence: 99%

Frequency Limitations of Resonant-Tunnelling Diodes in Sub-THz and THz Oscillators and Detectors

Feiginov

2019

J Infrared Milli Terahz Waves

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The review outlines the basic principles of operation of resonant-tunnelling diodes (RTDs) and RTD oscillators followed by an overview of their development in the last decades. Further, we discuss different types of RTDs and RTD oscillators, the limitations of RTDs due to parasitics, inherent limitations of RTDs and operation of RTDs as detectors. We also give an overview of the present status of sub-THz and THz RTD oscillators and give several examples of their applications.

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“…The tunneling process is very fast and therefore suitable for high-speed applications such as terahertz sources. Recent works on RTDs [47][48][49][50][51][52][53][54][55][56] are given in Table 4 and Fig. 4.…”

Section: Resonant Tunneling Diodementioning

confidence: 99%

Comparative Efficiency and Power Assessment of Optical Photoconductive Material-Based Terahertz Sources for Wireless Communication Systems

Yazgan

Jofre

Romeu

2018

J CIRCUIT SYST COMP

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Terahertz band has recently attracted the attention of the communication society due to its huge bandwidth and very high-speed wireless communications capability. It has been utilized in a variety of disciplines including physics, biology and astronomy for years; and the main concerns have always been obtaining highly efficient and high-power terahertz sources. Today, these problems are still the most important issues in establishing an operable wireless terahertz communication link. In this paper, recent studies in the field of terahertz source design are investigated based on the terahertz output power and efficiency. Solid-state sources and optical sources were comparatively reviewed with optical photoconductive material (OPM)-based methods which are combined with the terahertz antennas in the design phase generally. For wireless communication, the most suitable frequencies are between 0.3[Formula: see text]THz and 1[Formula: see text]THz due to the attenuation profile of the atmosphere. For this reason, based on the recently published studies, it has been observed that OPM and resonant tunneling diode-based sources are the most promising terahertz sources in terms of efficiency and power. Key issues and the main problems of terahertz photoconductive antennas which are the base of OPM method were also discussed in this paper.

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Wide frequency‐tunable resonant tunnelling diode terahertz oscillators using varactor diodes

Cited by 26 publications

References 12 publications

Tutorial: Terahertz beamforming, from concepts to realizations

Tutorial: Terahertz beamforming, from concepts to realizations

Frequency Limitations of Resonant-Tunnelling Diodes in Sub-THz and THz Oscillators and Detectors

Comparative Efficiency and Power Assessment of Optical Photoconductive Material-Based Terahertz Sources for Wireless Communication Systems

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