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Click here to read about RF CafeKirt Blattenberger
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"No partial credit! Get wrong answer, bridge fall down!" - Joe Desposito's calculus prof

Today in Science History

Tech Headline News

- Archives -

Improving Internet with Mid-Wavelength Infrared

The Big Internet Brands of the '90s — Where Are They Now?

Apple Sees iPhone Sales Drop Again

Blackberry Battles on with Dtek50 Android Phone

Globalstar CEO Keeps Pressure on FCC to Allow TLPS

Ericsson's CEO Resigns with Immediate Effect

5G Could Have Slow Take-up After 2020

Apple Files Patent Application for Hybrid Acoustic EMI Foam

Evolving Flip-Chip Technology Boosting Markets

Ofcom to Separate BT and Openreach

Wafer Bonding to Integrate Si, GaAs, and GaN

e2v Is Looking for an RF Test / Product Engineer

RF Test / Product Engineer Needed by e2v - RF Cafee2v is looking for an RF Test / Product Engineer that will support high performance RF IC products and Broad Band Data Converters. This position will develop the test programs, analyse and optimize RF device types such as switches, mixers, PLLs, DSA, and prescalers in challenging environments for defense an space systems. High speed data converters with industry leading performance will also be a key focus. The position will also require the candidate to take the lead role in assessing and understanding Aerospace and Defense Electronics customers’ system requirements ...

Koaxis Advertisement

Koaxis coaxial cable - RF CafeA few years ago, I wrote an article titled "Too Clever by Half?," which presented a few magazine advertisements that IMHO were, based on the choice of graphics, either very effective or a total failure. This Koaxis ad appeared in the July 2016 issue of Microwaves & RF magazine. Whether intentional or not, the bald guy lineup is eye-catching - and therefore effective - as evidenced by motivating me to call attention to it. Put a monocle on the guy 2nd from the left and you'll have Werner Klemperer (Colonel Klink of Hogan's Heroes)! ...

DARPA Puts Its Money on Spectrum Sharing

DARPA Puts Its Money on Spectrum Sharing - RF Cafe"As the Pentagon seeks to cram more electronic gear and wireless devices into a shrinking amount of radio spectrum, its research arm announced guidelines this week for yet another technology competition designed to find new ways to share and ensure access to the airwaves. The Defense Advanced Research Projects Agency announced a Spectrum Collaboration Challenge in March designed to leverage emerging machine-learning tools ..."

Good Calculators

Good Calculators - RF CafeGood Calculators has large collection of calculators for engineering, finance, logistics, loans, budgets, conversions, sports & health, statistics, mechanics, and other topics. Unfortunately, there do not appear to be any electrical engineering calculators, but if you need to check the health of your retirement fund or to calculate the surface area or volume of a frustum, then it has you covered.

Material Property May Lead to High Temp Superconductivity

Material Property May Lead to High Temp Superconductivity - RF Cafe"Researchers at the U.S. Department of Energy's (DOE) Ames Laboratory have discovered an unusual property of purple bronze that may point to new ways to achieve high temperature superconductivity. While studying purple bronze, a molybdenum oxide, researchers discovered an unconventional charge density wave on its surface. A charge density wave (CDW) is a state of matter where electrons bunch together in a repeating pattern, like a standing wave of surface of water ..."

Record 1,100kV UHVDC Power Link Rolls out in China

Record 1,100kV UHVDC Power Link Rolls out in China - RF Cafe"The Changji-Guquan ultra high voltage DC (UHVDC) link will transmit power from the Xinjiang region in the Northwest, to Anhui province in eastern China, setting a new world record in terms of voltage level, transmission capacity and distance. It will be capable of transporting 12,000 megawatts of electricity - the equivalent of 12 large power plants - and is a 50% increase in transmission capacity compared to the 800 kV UHVDC links currently in operation. Using the higher ..."

Please Welcome LadyBug Technologies As the Newest Advertiser !

LadyBug TechnologiesLadyBug Technologies means Peak Performance in Power Sensors: 9 kHz to 40 GHz and 80 dB DR. LadyBug manufactures a broad line LadyBug Technologies waveform displayof First Tier NIST traceable USB power sensors that are compatible with Windows XP, Win 7, 8 & 10; in 32 and 64 bit systems, along with LINUX. Also the only SPI & I2C sensor available. Patented NoZero NoCal feature - Simply connect and measure to receive a high accuracy measurement.

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DC vs. AC Whodunit: Murdoch Mysteries "Power"

DC vs. AC Whodunit: Murdoch Mysteries "Power" - RF CafeSince I don't watch TV, I was unaware of a Canadian police detective series titled "Murdoch Mysteries," which is cast in Toronto at the turn of the 20th century. Melanie found a DVD at the library with season 1 episodes, and noted that the first show was "Power," with a storyline based on the debate over whether Thomas Edison's DC current was safer than Nikola Tesla's AC current (Tesla was backed by George Westinghouse). You might be familiar with the heated and often violent exchanges that really happened between the two camps, often referred to as "The War of Currents." After all, a lot of money ...

Silicon-Air Battery Runs More >1,000 Hours

Silicon-Air Battery Runs More >1,000 Hours - RF Cafe"Researchers have been working on a number of alternative chemistries to lithium-ion for next-generation batteries, silicon-air among them. However, while the technology has been viewed as promising and cost-effective, to date researchers haven’t managed to develop a battery of this chemistry with a viable running time. That's until now, with the invention by researchers in Germany of a silicon-air battery that can run more than ..."

Short Antennas for Mobile Operation

Short Antennas for Mobile Operation, September 1953 QST - RF CafeHere is a very in-depth and comprehensive discussion on antenna system design and evaluation for a mobile platform; i.e., a car or truck. As was common with QST articles of yore, there is a plethora of equations, sketches, graphs, and tables provided for reference. Radiation resistance, ground resistance, system impedance, antenna tuning, radiation efficiency, current distributions, and much more are introduced and explained. Even being six decades old, the information is as valuable today as it was then ...

Chemical Etching Method Helps Transistors Stand Tall

Chemical Etching Method Helps Transistors Stand Tall - RF Cafe"Smaller and faster has been the trend for electronic devices since the inception of the computer chip, but flat transistors have gotten about as small as physically possible. For researchers pushing for even faster speeds and higher performance, the only way to go is up. University of Illinois researchers have developed a way to etch very tall, narrow finFETs, a type of transistor that forms a tall semiconductor 'fin' for the current to travel over. The etching technique ..."

VidaRF Intros 4.1/9.5 Mini DIN Series

VidaRF Intros 4.1/9.5 Mini DIN Series - RF CafevidaRF has introduced a line of 4.1/9.5 series connectors and cable assemblies that are designed to address increasing demands in mobile communication industry, including increased performance demands, low PIM, Albaloy plating, and at same time reducing its size to support ongoing space reduction requirements. They feature a smaller footprint than the 7/16 connector (30% less) with similar RF performance ...

Ultra-Flat Circuits Will Have Unique Properties

Ultra-Flat Circuits Will Have Unique Properties - RF Cafe"The old rules don't necessarily apply when building electronic components out of two-dimensional materials, according to scientists at Rice University. The Rice lab of theoretical physicist Boris Yakobson analyzed hybrids that put 2-D materials like graphene and boron nitride side by side to see what happens at the border. They found that the electronic characteristics of such 'co-planar' hybrids differ from bulkier components. Their results appear this month in the American Chemical Society journal Nano Letters. Shrinking electronics means shrinking their components. Academic labs ..."

Satellites Flooding Earth Orbit, But No One’s Directing Traffic

Satellites Flooding Earth Orbit, But No One’s Directing Traffic - RF Cafe"Companies around the globe are launching an increasing number of satellites, crowding Earth's orbit in an effort to satisfy the ravenous on-demand desire for more broadband, satellite television and communications. In the past five years, the number of operational satellites has jumped 40%, and nearly 1,400 now orbit the Earth. Industry officials say that number could more than double in five years as a revolution in technology has made satellites smaller and more affordable. Entrepreneurs eye the ethereal real estate a couple of hundred miles up as a potentially ..."

Sylvania Electric Peanut Tube Radio Advertisement

Sylvania Electric Peanut Tube Radio Advertisement, May 1949 Radio & Television News - RF CafeWhen this May 1949 issue of Radio & Television News was being written, Messrs. Bardeen. Shockley, and Brattain had recently announced to the world their invention of the point contact germanium transistor. Sylvania Electric here is touting a miniature pocket radio featuring their line of subminiature (aka "peanut") tubes. Tubes like the 1AC5 'only' needed about 60 volts for operation as opposed to 300 volts or more for standard tubes. This required a voltage multiplier circuit that consisted of inductors, diodes, and capacitors for implementation, which added significant volume to the radio. It was in the Autumn of 1954 that Regency began selling its TR-1 transistor radio - the world's first.

New Material Could Advance Superconductivity

New Material Could Advance Superconductivity - RF Cafe"Scientists have looked for different ways to force hydrogen into a metallic state for decades. A metallic state of hydrogen is a holy grail for materials science because it could be used for superconductors, materials that have no resistance to the flow of electrons, which increases electricity transfer efficiency many times over. For the first time researchers, led by Carnegie's Viktor Struzhkin, have experimentally produced a new class of materials blending hydrogen ..."

EM Research HFS-12000-XA: 7 to 12 GHz Surface-Mount Synthesizer

EM Research Releases New HFS-12000-XA: 7 to 12 GHz Surface-Mount Frequency Synthesizer - RF CafeThe HFS-12000-XA is a 7,000 to 12,000 MHz surface-mount frequency synthesizer designed as a high performance down-converter LO for RADAR Digital Signal Processors. The design also features low phase noise (<-90 dBc/Hz @ 100 KHz offset) and fast switching capability (<750 μSec, Band-Edge to Band-Edge) critical for signals intelligence applications. The HFS-12000-XA also locks to a 100 MHz reference and contains a channel step size of 1 MHz or ...

New to Expert Witnessing? Know Your Legal Lingo - Part 1

New to Expert Witnessing? Know Your Legal Lingo - Part 1, by IMS ExpertServices - RF CafeWendy Pearson, writing for IMS ExpertServices, offers this first installment in a series of articles advising people new to the expert witness realm on how to prepare for the process. Being an authority in your professed field is not always to enough assure success in the courtroom - or even for making it as far as a courtroom. Part 1 provides a basic introduction to legal lingo. Just as a person who does not speak the language of a country he/she is visiting is in many ways easy prey for crafty operators, a witness at trial can have his/her credibility damaged by being made to appear ignorant of standard courtroom procedures and language. Accordingly, competent counsel ...

Making THz Lasers More Powerful

Making Terahertz Lasers More Powerful - RF Cafe"Researchers have nearly doubled the continuous output power of a type of laser, called a terahertz quantum cascade laser, with potential applications in medical imaging, airport security and more. Increasing the continuous output power of these lasers is an important step toward increasing the range of practical applications. The researchers report their results in the journal AIP Advances, from AIP Publishing. Terahertz radiation sits between microwaves and infrared light on the electromagnetic ..."

GaN Rising in High-Power RF

GaN Rising in High-Power RF - RF Cafe"Gallium nitride (GaN) is capturing market share in high-power RF semiconductors, especially in wireless infrastructure, the market research firm said. 'GaN is increasing its market share in 2016, and we believe it will be a significant force by 2021,' said Lance Wilson, research director at ABI Research, in a statement. 'This now mainstream technology bridges the gap between two older technologies, exhibiting the high-frequency performance of Gallium Arsenide and power handling capabilities of Silicon LDMOS ..."

ATT Using Drones for Cell Tower inspections

ATT Using Drones for Cell Tower inspections - RF Cafe"Flying drones might sound like a fun hobby, but some RF engineers are making it part of their job, going so far as to envision flying COWs, or Cells on Wings, to provide LTE coverage at concerts or during emergencies. Earlier this month, AT&T announced the launch of a national trial involving drones in a program being overseen by Art Pregler, who serves as AT&T's drone program director and began his tech career in the U.S. Air Force. More trials are continuing, including this week. AT&T started its LTE drone program investigation a year ..."

How to Live Longer

How to Live Longer - RF CafeMy career involving controlled movement of electrons began with working around high voltages and currents. In electrical vocational classes, the instructor lectured on the potential (pun intended) harm that could be done to life and property because of ignorance or inattention to the job at hand. Safety practices were reviewed prior to allowing us plebes to handle not just 3-Ø, 480 V supplies for motors, but also for household AC circuits and low voltage sources with high current outputs. We all had the opportunity to get 'lit up' with 115Vac and even 230 Vac if we dared (a practice that would never be allowed in today's environment). We watched films ...

Notable Tech Quote: Thomas Edison

Thomas Alva Edison (Ken Boll cachet) - RF Cafe"What progress individuals could make, and what progress the world would make, if thinking were given proper consideration! It seems to me that not one man in a thousand appreciates what can be accomplished by training the mind to think." -- Thomas Edison during an interview with B.C. Forbes in The American Magazine, January 1921.

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