21 August 2019 Integrated GaAs Stacked-FET High-Power Amplifiers Stacking FETs in power amplifiers allows voltages higher than the breakdown voltage of a single transistor. Here is a procedure for designing such devices, producing a prototype three-transistor S-band GaAs stacked-FET with PAE over 40% at an output power of 20 W–more than twice the output power […]
mmWave 5G Power Amps Forward to a friend View web version Join MTT-S 20 March 2019 mmWave 5G Power Amps Researchers at the University of California, San Diego review key power amplifier requirements for millimeter-wave 5G systems and evaluate competing technologies’ output power, efficiency, linearity and material characteristics. Alternatives tested […]
IN MEMORIAM Tom Brazil (1952-2018) MTT-S President-Elect Dominique Schreurs writes, “It is with great sorrow that I must inform you that MTT-S President Tom Brazil passed away unexpectedly on Friday, April 13th. Funeral services will be held on April 20th in Dublin, Ireland. Let us remember him as a great mentor, an excellent leader, a […]
MEASUREMENT Time-Domain Ultra-Wideband Imaging A fully automatic time-domain measurement system for ultra-wideband microwave imaging uses a pair of movable antennas to transmit and receive. Each antenna can be independently controlled to complete a full measurement (of both incident and total field) within 20 minutes. Comparison with a frequency-sweep method shows that both methods allow for […]
ASSISTIVE TECHNOLOGY Antennas for an Intraoral Tongue Drive A new arch-shaped intraoral Tongue Drive System (iTDS, a tongue-controlled wireless assistive technology operated by a user-defined tongue gestures to issue control commands) occupying the buccal shelf space in the mouth, without limiting the available space for tongue motions, with the design, characterization, and comparison of three […]
MESSAGE FROM 2018 PRESIDENT TOM BRAZIL “An Amazing Time for Microwaves” The remarkable communications advances we’ll see during the coming year rely on electromagnetic energy in the RV, microwave, mm-wave, and terahertz bands. The coming of 5G will mean mm-waves everywhere, and we may even cut some power cables to harness wireless power transfer. This […]
Submit papers by 18 February for the Power Transfer Conference (WPTC2018), running 3-7 June in Montreal with the Workshop on Emerging Technologies: Wireless Power (WoW), and the Wireless Power Congress (WPC). Read more
A new method combining terahertz time-domain spectroscopy (THz-TDS) with metamaterials detects concentrations of the pesticide carbendazim as low as 5 mg/L, sensitivity about 4 orders of magnitude better than squash THz-TDS. Read more
Development of a synthesizer to support planetary science instrumentation using a CMOS system-on-chip to deliver at least 10 microwatts across the 177–205 GHz lock range while consuming 249 mW of dc power. Read more
The remarkable communications advances we’ll see during the coming year rely on electromagnetic energy in the RV, microwave, mm-wave, and terahertz bands. The coming of 5G will mean mm-waves everywhere, and we may even cut some power cables to harness wireless power transfer. This year’s IMS in Philadelphia will feature state-of-the-art research and the largest […]
THZ Imaging Human Corneas In Vivo Two papers from UCLA outline optical design and prototype development and evaluation of a new system of reflection-mode terahertz imaging for early, accurate, non-contact detection and study of corneal diseases in humans. The system reveals corneal-tissue water content and geometry while avoiding the problems caused by direct contact with […]
5G Power, Linearity, and Efficiency Prediction for MIMO Arrays Since MIMO array elements are electromagnetically coupled, the waves fed to the antennas also drive the power amplifier (PA) output ports, creating an apparent variable load at each PA output. Simulation is a powerful tool in understanding how these MIMO systems behave. Such simulators should be […]
ANTICOUNTERFEITING Radiated Electromagnetic Emission for Integrated Circuit Authentication Counterfeit integrated circuits are a growing problem with economic and safety implications. Semiconductor makers and embedded-system designers are looking for ways of making sure that chips really are what they purport to be. The authors propose fingerprinting each IC’s electromagnetic radiation emissions using a variability-aware circuit configuration, […]
FISH-EYE BEAM-SPLITTER Realizing All-Dielectric Devices from Transformation Electromagnetics A team from Oxford and the University of London fabricated and tested a 2-D generalized Maxwell fish-eye lens has been from all-dielectric polymer/ceramic composite materials. The graded refractive index profile of the lens, discretized into a concentric-ring structure, functioned as a two-way beam splitter. Epoxy composites, with […]
WPT Ultra-Light Rectenna for Harvesting Next-Generation LTE RF Energy A novel, compact, ultralightweight multiband RF energy harvester fabricated of nested annular slots on a paper substrate to operate in all recently released LTE bands (range 0.79-0.96 GHz; 1.71-2.17 GHz; and 2.5-2.69 GHz). The design features an RF-to-dc conversion efficiency in the range of 5%-16% for […]
NONLINEAR OPTICS Terahertz Quantum Cascade Laser Frequency Combs Quantum cascade lasers have shown tremendous potential for generating frequency combs in the mid-infrared and terahertz regions. Four wave mixing (FWM) is the main comb formation process. Group velocity dispersion (GVD) is the main comb-degradation mechanism. And spatial hole burning (SHB) has a considerable impact on whether […]
