Double-resonant-tunneling-diode patch-antenna oscillators

Ourednik, Petr; Hackl, Thomas; Spudat, C.; Nguyen, Dinh Tuan; Feiginov, M.

doi:10.1063/5.0068114

Cited by 15 publications

(12 citation statements)

References 21 publications

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“…Table I shows state-of-the-art THz sources using RTDs, for comparison with the results [11]- [16]. We propose arraying active antennas with integrated patch antennas and RTDs, as a compact and high-power THz source.…”

Section: Discussionmentioning

confidence: 99%

“…The two RTDs are arranged in mirror symmetry with respect to the center of the patch antenna and operate in push-pull mode [16], [22]. During oscillation, a standing wave node of f osc is formed in a direction perpendicular to a straight line passing through the center of the patch antenna and connecting the two RTDs.…”

Section: Single Antenna With Two Rtdsmentioning

confidence: 99%

“…In recent years, there has been much technology development: quantum cascade lasers have been proposed in the field of optical devices, and THz oscillators based on Si, Si-Ge, and In-P transistors in the field of electronic devices [4]- [9]. Resonant-tunneling diodes (RTDs), which offer the advantage of being capable of fundamental oscillation in high-frequency bands, including THz, are also candidates for efficient semiconductor THz sources operating at room temperature [10]- [16].…”

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confidence: 99%

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A High-Power Terahertz Source Over 10 mW at 0.45 THz Using an Active Antenna Array With Integrated Patch Antennas and Resonant-Tunneling Diodes

Koyama

Kitazawa

Yukimasa

et al. 2022

IEEE Trans. THz Sci. Technol.

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We propose a compact, high-power, and highdirectivity surface-emitting terahertz (THz) source based on an array of active antennas with integrated patch antennas and resonant-tunneling diodes (RTDs). An array configuration of active antennas, each with an integrated patch antenna and two RTDs and coupled by microstrip lines, enables spatial power combining and improves directivity through coherent oscillation. We confirmed a maximum radiation power of 11.8 mW in a prototype 6 × 6 array at an oscillation frequency of 0.45 THz. Parasitic oscillation at low frequencies was suppressed by use of a bias stabilization circuit consisting of series-connected resistors and capacitors, and the dc to RF efficiency of this device was estimated to be approximately 1%. The radiant intensity of 210 mW/sr and the 3-dB beamwidth of 13°for the measured 6 × 6 array confirmed that directivity was improved by coherent oscillation based on mutual injection locking. The directivity of the patch antenna capable of surface emission can be controlled only by the number of antennas, even if there is no secondary radiator, such as an Si lens. The obtained results suggest that RTDs are promising as practical THz sources for realizing applications of THz imaging and 6G communication.

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Section: Discussionmentioning

confidence: 99%

Section: Single Antenna With Two Rtdsmentioning

confidence: 99%

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confidence: 99%

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A High-Power Terahertz Source Over 10 mW at 0.45 THz Using an Active Antenna Array With Integrated Patch Antennas and Resonant-Tunneling Diodes

Koyama

Kitazawa

Yukimasa

et al. 2022

IEEE Trans. THz Sci. Technol.

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“…(8). Detailed information on similar RTDs with 1.6 nm barriers has been presented in [25]. The PP waveguide cross section of our devices is shown in Fig.…”

Section: Fabricationmentioning

confidence: 99%

Demonstration of Sub-THz Traveling-Wave Resonant-Tunneling-Diode Oscillators

Jéhn

Feiginov

2023

IEEE Trans. Nanotechnology

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As a proof of principle, operation of traveling-wave resonant-tunneling-diodes (RTDs) oscillators has been demonstrated experimentally in the frequency range 100-400 GHz. A theoretical model describing a realistic coupled system, consisting of a traveling-wave RTD and a patch antenna, has been developed. The model describes the eigen resonances and the eigen modes, which have a mixed character of both subsystems. The model and the experimental results are in agreement with each other. We also demonstrate that some oscillators were switching between different resonant modes of the system with the change of bias. The phenomenon could be used for an extended frequency control of the RTD oscillators.

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“…We sketch the working point at the center of the third-order I -V curve together with the corresponding dc and ac load lines. Blue and green curves show the theoretical and experimental I -V curves, respectively, of an RTD with 1.6-nm barriers studied in [7]. The point 0 indicates an idealized position of the current and bias zero point to minimize the dc power of an RTD with a third-order I -V curve.…”

Section: A Third-order Approximation For Rtd I -V Curvementioning

confidence: 99%

Limitations of Output Power and Efficiency of Simple Resonant-Tunneling-Diode Oscillators

Spudat

Ourednik

Picco

et al. 2023

IEEE Trans. THz Sci. Technol.

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We show that the maximum output power of a simple resonant-tunneling-diode (RTD) oscillator is fundamentally limited by the radiation conductance of its antenna and by a maximum RTD voltage swing. For stand-alone RTD oscillators with common simple antenna types, this power level most likely cannot exceed 1 mW at sub-THz and THz frequencies. The RTD current density, conductance, and capacitance have no direct influence on the maximum power level but those RTD parameters determine how close one can get to the maximum. We show that the maxima of the output power and dc-to-RF conversion efficiency are achieved for different sets of the parameters of RTD oscillators and not simultaneously. We demonstrate slot-antenna RTD oscillators with up to 0.5-mW output power at ≈ 100 GHz and with 5% conversion efficiency, which could be increased further up to 8%, although at the expense of reduced output power. Composite RTD oscillators with separate resonators and radiators can possibly overcome the limitations of simple oscillators.

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Double-resonant-tunneling-diode patch-antenna oscillators

Cited by 15 publications

References 21 publications

A High-Power Terahertz Source Over 10 mW at 0.45 THz Using an Active Antenna Array With Integrated Patch Antennas and Resonant-Tunneling Diodes

A High-Power Terahertz Source Over 10 mW at 0.45 THz Using an Active Antenna Array With Integrated Patch Antennas and Resonant-Tunneling Diodes

Demonstration of Sub-THz Traveling-Wave Resonant-Tunneling-Diode Oscillators

Limitations of Output Power and Efficiency of Simple Resonant-Tunneling-Diode Oscillators

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