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"I can accept the theory of relativity as little as I can accept the existence of atoms and other such dogmas" - Ernst Mach

Today in Science History

Tech Industry Headlines

Tech Industry Headlines - RF Cafe- Archive -

• Cloud Gaming Could Account for Half of 5G Traffic

Qorvo to Acquire Analog / Mixed-Signal Power IC Firm Active-Semi

• Unexpected Properties Found in New Type Superconductor

• TIM, Ericsson Install 5G Demo Zone at Rome's International Airport

• Is Defense Acquisition at an Inflection Point?

Radio Still Owns the Ear

• Russia's New Radar Surveillance Aircraft Tracks 300 Targets at Once

• 1st Demo of RF N-Polar GaN Metal-Insulator-Semiconductor HEMT

FCC's 24 GHz Auction Has Raised Nearly $2B in Bids

The Discovery of Radio Waves

The Discovery of Radio Waves - RF CafeAn excellent short history on "The Discovery of Radio Waves" was published by George Steber in the Jan/Feb 2019 issue of Nuts & Volts magazine. "When the concept of electromagnetic waves was first proposed around 1864, it was met with great skepticism. As a result, the idea languished for a long time. This is understandable since the foundations of the theory were complex and the conceptual ideas were at odds with physical thinking. It took several decades for a handful of dedicated persons - infatuated with the mysteries of electricity and magnetism - to finally put the theory on a solid footing "

Improving Object Detection with Low-Bandwidth Radar

Improving Object Detection with Low-Bandwidth Radar - RF Cafe"Researchers at Tel Aviv University have designed a new type of radar ranging system that requires virtually no bandwidth to operate successfully. This new method does not have the bandwidth limitations of traditional methods, meaning it can be used in a vast array of different applications - particularly when it comes to the automotive industry Traditionally, radar resolution was believed to be proportional the bandwidth use. Essentially, the wider available range of frequencies, the better the radar will be at detecting objects in its path. The new method devised by researchers seeks to change all that …"

Restoring Notre−Dame Using Modern Technology

Restoring Notre Dame Using Modern Technology - RF CafeEE Times has an interesting piece on their website regarding how modern engineering methods might be used to restore the fire-ravaged Notre−Dame church to its original condition. Some interesting observations are made, one regarding how cleaning and replacing stained glass tiles will affect lighting to the 13th century conditions vs. as it was two weeks ago. Another suggests ultrasonic analysis of mortar joints to structural integrity, use of drone photos and laser measurement to construct a detailed 3D model of the building for work planning. It also suggests a call to social media for obtain as many of the millions of photographs taken by visitors from all perspectives and times of day for recreating damaged or destroyed components.

Notes on the Getter

Notes on the Getter, February 1958 Radio-Electronics - RF CafeIf you happen to be Estonian, you might think of something entirely different than most of us do when we hear the word "getter." In fact, you probably capitalize the word since it is the name of a pop singer from your country, Getter Jaani. If you are a child living in Japan, you would probably think of Getter Robo, an anime from a popular cartoon series. I, and I dare say just about everyone else that visits RF Cafe, knows getter as that silvery deposit (typically barium) that resides inside vacuum tubes for the purpose of helping to maintain the vacuum and to absorb pesky random molecules that might otherwise cause electrical noise in the circuit. This article from a 1958 edition of Radio-Electronics discusses the purpose of getter. BTW, I had never heard of either of the other two Getters due to OGS (old guy syndrome) 

White Paper: The Future of EMC Test Laboratories

Rohde & Schwarz: The Future of EMC Test Laboratories  - RF CafeRohde & Schwarz has published a white paper entitled, "The Future of EMC Test Laboratories," which addresses the increasingly difficult to meet EMI and EMC certification requirements in today's extremely crowded electromagnetic spectrum. "The growing complexity of electronic devices within both military and commercial products has lead to a significant increase in failure rate of EMC conformance testing. Product design cycle times continue to decrease due to competitive pressure in the market. Product design companies are spending more money on multiple iterations of product EMI compliance testing at EMC test laboratories, and this comes at a significant …"

Many Thanks to Res-Net Microwave for Continuing Support!

Res-Net Microwave componentsRes-Net Microwave has a complete line of precision RF & microwave components including attenuators, terminations, resistors, and diode detectors for commercial, military, and space applications. Products range from the small flange type to large 2,000 watt connectorized power attenuators and/or terminations at frequencies up to 26.5 GHz. In-house photo etch and laser trim capability. Please check out Res-Net Microwave's website to see how they can help with your current project ...

Engineering & Science Crossword Puzzle for April 21

RF Cafe Engineering & Science Crossword Puzzle April 21, 2019Since 2000, I have been creating custom technology-themed crossword puzzles for the brain-exercising benefit and pleasure of RF Cafe visitors who are fellow cruciverbalists. The jury is out on whether or not this type of mental challenge helps keep your gray matter from atrophying in old age, but it certainly helps maintain your vocabulary and cognitive skills at all ages. A database of thousands of words has been built up over the years and contains only clues and terms associated with engineering, science, physical, astronomy, mathematics, chemistry, etc. You will never find a word taxing your knowledge of a numbnut soap opera star or the name of some obscure village in the Andes mountains. You might, however, encounter the name of a movie star like Hedy Lamarr or a geographical location like Tunguska, Russia, for reasons which, if you don't already know, might surprise you 

Mac's Radio Service Shop: Pride and Prejudice

Mac's Radio Service Shop: Pride and Prejudice, April 1955 Radio & Television News - RF CafeThere's not a much better way to finish up a hard week at the office than reading a new episode of John T. Frye's "Mac's Radio Service Shop." Mac McGregor and his trusty sidekick technician Barney tackle nearly every issue associated with an electronics sales and service establishment back in the heyday of radios and televisions. You might recognize the title of "Pride and Prejudice" as being borrowed from Jane Austin's classic, which, to summarize, deals with, well, pride and prejudice based on one's social status, and how it results in lost opportunities. To be honest, I have not read the book (Melanie's the designated book reader in our household) but I did see the movie version starring Keira Knightly. Anywho, you'll need to read the second half of the story to get to the actual pride and prejudice part 

Noise and its Shaping in Ultra-Low-Noise Synthesizer Design

Noise and its Shaping in Ultra-Low-Noise Synthesizer Design - RF CafeThis is part 3 of a 5-part series of articles by Farron Dacus. You can access this and the previous two articles and "Noise and its Shaping in Ultra-Low-Noise Synthesizer Design" on the MW&RF website. "This third part in our low-noise synthesizer design series is the medium-length online version. In print are the abridged versions, while full-length versions are available at www.longwingtech.com. Part 1 (Dec. 2018) covered basic design for functionality and stability. Part 2 (Feb. 2019) covered the many noise sources in the synthesizer outside of the actual synthesizer IC. This third article looks into synthesizer IC noise, the closed-loop shaping of noises, and related issues such as optimum bandwidth. Here, a key metric for characterizing synthesizer IC noise is developed. This material also leads directly to analysis of optimum loop bandwidth …"

Balloons Raise Shortwave Antenna

Balloons Raise Shortwave Antenna, April 1935 Short Wave Craft - RF CafeAntennas have been deployed in difficult environments using many ingenious methods over the years both by professionals and amateurs. The process typically involves first propelling a lightweight string or wire across and/or up to a supporting structure (a tower, tree, building, whatever) and then using that lead line to draw the antenna and its accompanying coaxial or twin lead cable into its final position. Sometimes simply tying a line to a rock and tossing it over a tree branch does the trick, but usually deployment requires a more powerful launch such as a a bow and arrow or even a model rocket. Many years ago R/C Modeler magazine reported on a large radio controlled airplane (Senior Telemaster) that towed a lead line across a wide gulch 

Skyworks Waveguide Circulators for 5G Infrastructure

Skyworks Launches Suite of Custom Waveguide Circulators for 5G Infrastructure - RF CafeSkyworks Solutions, an innovator of high performance analog semiconductors connecting people, places and things, today unveiled its newest family of mini circulators for 5G infrastructure. Circulators, which play a critical role in protecting RF elements from excessive signal reflection, help eliminate performance risks and safeguard vital equipment. Given footprint constraints in 5G, solution size is also a key factor. Leveraging proprietary materials and processes, Skyworks' ultra-small circulators occupy up to 50 percent less board space than competitive products without compromising functionality - making them ideal for 5G massive MIMO and small cell applications. Skyworks' mini circulator family represents just one segment of the company's expansive 5G 

A Soluble Memristor

A Soluble Memristor - RF Cafe"This new memristor mimics the activity of neural networks, but can be thrown into water and dissolved if data is at risk of falling into the wrong hands. Neurons are remarkable. Simply by firing in certain patterns and at particular frequencies in concert with one another, they endow us with something incredibly valuable: memory. It's no wonder that scientists have long sought to mimic neural networks, which are both compact and efficient, with electronic devices. One way is with the development of memristors, devices that retain a 'memory' of the direction and amount of electrical charge …"

Rohde & Schwarz: RF & Microwave, Analog, Digital, & Optical Test Equipment

Rohde & Schwarz RM & Microwave Test Equipment - RF CafeRohde & Schwarz develops, produces and markets test & measurement, information and communications technology. Focus is on test and measurement, broadcast and media, cybersecurity, secure communications, monitoring and network testing. Markets serviced are wireless, the automotive industry, aerospace and defense, industrial electronics, research and education, broadcast and media network operations, consumer electronics, cybersecurity for business and governments, communications and security solutions for critical infrastructures and the armed forces, reconnaissance equipment for homeland and external security, and much more 

High-Fidelity Anagram (Crossword, Actually)

High-Fidelity Anagram, January 1960 Electronics World - RF CafeAccording to the Oxford English dictionary, the definition of an anagram is: a word or phrase made by using the letters of another word or phrase in a different order; e.g. "Neat" is an anagram of "a net." Therefore, the title of this puzzle appears to be misnamed. Sometimes an anagram crossword puzzle is created in which the clues are in the form of anagrams, but even that is not the case here. With any due apologies to author Comstock, I hereby re-title this a "High-Fidelity Crossword Puzzle." The "high-fidelity" part is entirely appropriate since it refers to the musical nature of the clues and words. As mentioned previously, the late 1950s through the early 1980s was a major era for interest in high fidelity radio receivers and playback gear. It represented the transition from powerful vacuum tube amplifiers to hybrid amplifiers, clear through to high power transistorized amplifiers. "Man caves" of the day were outfitted with the latest 

Free e-Book: "73 Dipole and Long Wire Antennas"

73 Dipole and Long Wire Antennas - RF CafeMFJ Enterprises, probably the largest manufacturer of Ham radio equipment, is for a limited time offering a free downloadable copy of their e−book entitled, "73 Dipole and Long Wire Antennas." While on the MFJ website, you might want to take a look at the vast variety of products offered, including VSWR meters, high power attenuators and terminations, frequency counters, field strength meters, filters, amplifiers, EMI/RFI suppressors, antennas, antenna analyzers, coaxial switches, tuners, panel meters, and much more. While some stuff is specific to Ham bands, most can be used across very wide bandwidths 

Altum RF Announces Greg Baker as Founder and CEO

Altum RF Announces Greg Baker as Founder and CEO - RF CafeAltum RF, a supplier of high-performance millimeter-wave to digital semiconductor solutions for next generation markets and applications, announces Greg Baker as its Chief Executive Officer. As founder and CEO, Mr. Baker brings more than 25 years' experience to Altum RF in the RF and microwave semiconductor industry, including component design, business development, marketing and sales. With his extensive experience, Mr. Baker provides a clear understanding of product development, operations and supply chain management, customer partnerships, sales channels and strategic marketing. Most recently with MACOM as Senior Vice President and General Manager, RF & Microwave BU, Mr. Baker also previously served as CEO 

Thanks to VidaRF for Many Years of Supporting RF Cafe!

vidaRF passive RF & microwave components - RF CafeAt VidaRF, the phrase 'Providing Simple Solutions for Complex Connections' is more than just a slogan – it's a mindset, a mission, and a driving force behind everything we do. Their pledge is to design and distribute high performance, cost effective RF Microwave products to fit each customer's unique applications. Please visit VidaRF today to see how their lines of Attenuators & Terminations, Directional Couplers, Power Dividers, Coaxial Connectors, and Circulator & Isolators can be of use to your project. "When the standard just will not do, VidaRF has the solution for you!"

Electronics Poetry - "Pre-Radio"

Electronics Poetry - "Pre-Radio", June 1944 QST - RF CafeI learned something from this poem… or maybe I re-learned one of the many things taught to me that have been forgotten - the definition of a vinculum. I admit to having to look up the word in the dictionary after seeing it. How about you? Do you know what a vinculum is? A vinculum is a horizontal line placed over a number or numbers to indicating repeating groups (7/11=0.63), or for negation in Boolean equations (d=a-b+c), and it is also the dividing line between the numerator and the denominator; e.g. (½

3D Print Metamaterials with Unique Microwave Properties

3D Print Metamaterials with Unique Microwave Properties - RF Cafe"Engineers at Tufts University have 3D printed metamaterials with unique microwave and optical properties that go beyond, what can be achieved by only using conventional optical or electronic materials. The fabrication methods developed by the researchers demonstrate the potential of 3D printing to expand the range of geometric designs and material composites that lead to devices with novel optical properties. In one case, the researchers drew inspiration from the compound eye of a moth to create a hemispherical device that can absorb electromagnetic signals …"

Copper Mountain Technologies: Vector Network Analyzers

Copper Mountain TechnologiesCopper Mountain Technologies develops innovative and robust RF test and measurement solutions for engineers all over the world. Copper Mountain's extensive line of unique form factor Vector Network Analyzers include an RF measurement module and a software application which runs on any Windows PC, laptop or tablet, connecting to the measurement hardware via USB interface. The result is a lower cost, faster, more effective test process that fits into the modern workspace in lab, production, field and secure testing environments 

Basic Laser Experiments

Basic Laser Experiments, June 1971 Radio-Electronics - RF CafeParenthetically mentioned in this introductory article on lasers is a "Mie" type particle. At first I thought maybe it was a typo, but in fact it refers to Mie scattering, which is the dispersion of electromagnetic waves by isolated spheres, stratified spheres, infinite cylinders, or other geometries where radial and angular dependence are independent. Two simple experiments are described for demonstrating light scattering and absorption similar to what occurs in the atmosphere. Whereas procuring the 2.5 mW laser source and to a lesser extent suitable light meter would have been difficult and expensive in 1971 when this was published in Radio-Electronics magazine, today's cheap equipment puts them within the budgets of almost anyone. Many of the <$10 cat toy lasers provide plenty of power 

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About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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