Article

# A Single-Waveguide In-Phase Power-Combined Frequency Doubler at 190 GHz

[more]
LERMA, Obs. de Paris, Paris, France
(Impact Factor: 1.7). 07/2011; 21(6):332 - 334. DOI: 10.1109/LMWC.2011.2134080
Source: IEEE Xplore

ABSTRACT

This work represents the first demonstration of in-phase power-combined frequency multipliers above 100 GHz based on a dual-chip single-waveguide topology, which consists of two integrated circuits symmetrically placed along the E-plane of a single transmission waveguide. This strategy increases by a factor of 2 the maximum sustainable input power with regard to traditional waveguide multipliers. A biasless 190 GHz Schottky doubler based on this novel concept has been designed and tested with a 6-10% conversion efficiency measured across a 177-202 GHz band when driven with a 50-100 mW input power at 300 K.

### Full-text

Available from: E. Leclerc
• Source
• "Terahertz Schottky-diode-based frequency multipliers will then reveal their full potential, being driven by power levels in the 3–10 mW range, where nonlinearities of the semiconductor devices can be better exploited for higher conversion efficiencies. Moreover, advanced power-combined techniques [31], [32] coupled with advanced micro-machining of waveguide blocks [33] could dramatically improve the power handling capabilities of high frequency multipliers and consequently their output power. Based on these considerations , the authors believe that a fully solid-state electronic source working up to 4.7 THz at room temperature is feasible . "
##### Article: Design and Characterization of a Room Temperature All-Solid-State Electronic Source Tunable From 2.48 to 2.75 THz
[Hide abstract]
ABSTRACT: We report on the design, fabrication and test of an all-solid-state, frequency agile source that produces over ${\hbox{1}}~\mu{\hbox{W}}~(-{\hbox{30}}~{\hbox{dBm}})$ across the 2.48–2.75 THz band at room temperature. This frequency-multiplied source is driven by a $W$ -band synthesizer followed by a power amplifier that delivers 350–450 mW (25.5–26.5 dBm) and a cascade of three balanced frequency triplers. The first stage tripler is based on four power-combined six-anode GaAs Schottky diode devices, and the second stage tripler is based on two four-anode GaAs devices. The output tripler uses a single unbiased device featuring two anodes monolithically integrated onto a thin GaAs membrane. The source delivers a record ${\hbox{18}}~\mu{\hbox{W}}~(-{\hbox{17.5}}~{\hbox{dBm}})$ at 2.58 THz at room temperature. This frequency multiplied source is analyzed with a Fourier transform spectrometer (FTS) and the unwanted harmonics are found to be at least 29 dB below the desired signal. This source, when used as the local oscillator for a hot-electron bolometer mixer, will enable heterodyne instruments for future space missions to map the cosmologically-important 2.675 THz HD molecular line.
Full-text · Article · Mar 2012 · IEEE Transactions on Terahertz Science and Technology
• ##### Conference Paper: A 2.5-2.7 THz room temperature electronic source
[Hide abstract]
ABSTRACT: We report on a room temperature 2.5 to 2.7 THz electronic source based on frequency multipliers. The source utilizes a cascade of three frequency multipliers with W-band power amplifiers driving the first stage multiplier. Multiple-chip multipliers are utilized for the two initial stages to improve the power handling capability and a sub-micron anode is utilized for the final stage tripler. Room temperature measurements indicate that the source can put out a peak power of about 14 microwatts with more than 4 microwatts in the 2.5 to 2.7 THz range. Index Terms-Frequency multipliers, Schottky diode multipliers, Submillimeter-wave technology, Power combining, Varactor diodes.
No preview · Conference Paper · Jan 2011
• ##### Article: Technology, Capabilities, and Performance of Low Power Terahertz Sources
[Hide abstract]
ABSTRACT: New and emerging terahertz technology applications make this a very exciting time for the scientists, engineers, and technologists in the field. New sensors and detectors have been the primary driving force behind the unprecedented progress in terahertz technology, but in the last decade extraordinary devel- opments in terahertz sources have also occurred. Driven primarily by space based missions for Earth, planetary, and astrophysical science, frequency multiplied sources have dominated the field in recent years, at least in the 2-3 THz frequency range. More recently, over the past few years terahertz quantum cascade lasers (QCLs) have made tremendous strides, finding increasing applications in terahertz systems. Vacuum electronic devices and photonic sources are not far behind either. In this article, the various technologies for terahertz sources are reviewed, and future trends are discussed.
No preview · Article · Sep 2011 · IEEE Transactions on Terahertz Science and Technology