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Homepage Archive - December 2018 (page 3)

These archive pages are provided in order to make it easier for you to find items that you remember seeing on the RF Cafe homepage. Of course probably the easiest way to find anything on the website is to use the "Search RF Cafe" box at the top of every page.

Homepage Archive Pages

2018:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2017:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2016:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2015:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2014:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2013:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec

See Page 1 | 2 | 3 | 4 of the December 2018 homepage archives.


Friday 21

Thursday 20

Wednesday 19

Tuesday 18

Too-Small Cubicles: 1932 "The Wireless World" Article 

Broadcast Brevities, March 9th, 1932 The Wireless World Article - RF CafeAs the old saying goes, "The more things change, the more things stay the same." Incredibly, back in 1931 people were complaining about shrinking office cubicle sizes. To wit: "At 'Broadcasting House' rooms measuring 8ft. x 6ft. are being coveted by the many people who will be condemned to labour in cubicles 7ft. x 5ft. The Civil Engineer himself, who helped to design and erect the building, works in a compartment in which, as the American said, 'You couldn't cuss a cat without getting hair on your teeth.'" ...and whoa!, dig this statement by the author regarding the demise of "local oscillators" in the UK (a reference to unauthorized broadcasts?): "Steps might be taken to ensure the survival of a few specimens, perhaps by the founding of a national reservation similar to those which accommodate the Red Indians in America. The few remaining squealers and their ..."

PCB Directory: Printed Circuit Board Fabrication & Assembly

PCB  Directory - RF CafePCB Directory is the largest directory of Printed Circuit Board (PCB) Manufacturers, Assembly houses, and Design Services on the Internet. We have listed the leading printed circuit board manufacturers around the world and made them searchable by their capabilities - Number of laminates used, Board thicknesses supported, Number of layers supported, Types of substrates (e.g., material, flexible, rigid), Geographical location, and more ...


Topological Matters: Toward a New Kind of Transistor

Topological Matters: Toward a New Kind of Transistor - RF Cafe"Billions of tiny transistors supply the processing power in modern smartphones, controlling the flow of electrons with rapid on-and-off switching. But continual progress in packing more transistors into smaller devices is pushing toward the physical limits of conventional materials. Common inefficiencies in transistor materials cause energy loss that results in heat buildup and shorter battery life, so researchers are in hot pursuit of alternative materials that allow devices to operate more efficiently at lower power. Now, an experiment conducted at the U.S. Department of Energy's Lawrence Berkeley National Laboratory has demonstrated, for the first time, electronic switching in an exotic, ultrathin material that can carry a charge with nearly zero loss at room temperature ..."

Monday 17

Meet Mr. FET ... the Transistor That Thinks It's a Tube

Meet Mr. FET ... the Transistor That Thinks It's a Tube, February 1967 Popular Electronics - RF CafeYesterday was the 71st anniversary of the announcement of the transistor's invention by Drs. Shockley, Bardeen, and Brattain at Bell Labs, but it was a Sunday so not as many RF Cafe visitors saw the commemorative title graphic I used. Their transistor was a current-controlled signal amplifying device as opposed to the field-effect transistor (FET) which is a voltage-controlled signal amplifying device - as is the vacuum tube. I never thought about it before, but maybe that had something to do with the electronics world's hesitancy to adopt the transistor as a replacement for the tube. Early in the transistor's history, practical applications were limited due to low reliability, low power handling, low frequency, lack of ruggedness in harsh operating conditions, and other shortcomings compared to established and much refined vacuum tubes was reason enough to shun the newfangled technology, but that current-controlled thing ...

5 Ws of Spray-on Antennas

5 Ws of Spray-on Antennas - RF Cafe"Spray-applied MXene antennas could open the door for new applications in smart technology, wearables, and IoT devices. This method sprays invisibly thin antennas - made from a type of two-dimensional metallic material called MXene - that perform as well as those being used in mobile devices, wireless routers, and portable transducers. MXene titanium carbide can be dissolved in water to create an ink or paint. The exceptional conductivity of the material enables it to transmit and direct radio waves, even when it's applied in a very thin coating. Even transparent antennas with thicknesses of tens of nanometers are able to communicate efficiently. The thinnest antenna was 62 nanometers ..."

Lenny & the Squigtones - "The Jolliest Fat Man"

Lenny & the Squigtones (The Jolliest Fat Man) - RF Cafe Video for EngineersMost people who were around in the 1970s remember the sitcom "Laverne & Shirley." It was popular as a part of the whole 1950s renaissance that was happening with shows like "Happy Days," "Grease," "American Graffiti," et al, that captured the attention of the parents of we teenagers as well as weselves [sic]. I was being held against my will at Southern Senior High School at the time, and many of the kids adopted a "greaser" lifestyle that included cigarette packs rolled up in t-shirt sleeves and Brylcreem in the hair (mainly just the guys), leather jackets and Keds high-top sneakers (guys and gals), and poodle skirts and saddle Oxford shoes (mainly just the gals). Two weirdo characters, Lenny and Squiggy, made cameo ...

At the 1929 Radio World's Fair

At The 1929 Radio World's Fair, November 1929, Radio-Craft - RF CafeYou've heard of the World's Fairs, the most familiar probably being the 1933 Chicago World's Fair where the theme was "A Century of Progress." World's Fairs have been held in various cities worldwide since the late 1790s. In 1929, the World's Fair was held in the United Kingdom, but the "Radio World's Fair," which began its annual run in 1924 (click on stamps thumbnail), was held in New York City. Surprisingly little exists on the Internet about the events. It was more of a trade show to introduce new products than it was a fair, as can be seen from the photos. Radios with decorative wooden cabinets were becoming popular as the number of commercial broadcast stations was growing rapidly. Remote control in the day meant a handheld unit with a cable attached to the main system. Crosley introduced its first gendered radio model - the Monotrad ...

Empower RF Systems: RF & Microwave Power Amplifiers

Empower RF SystemsEmpower RF Systems is a global leader in power amplifier solutions. Empower RF Systems is an established and technologically superior supplier of high power solid state RF & microwave amplifiers. Our offerings include modules, intelligent rack-mount amplifiers, and multi-function RF Power Amplifier solutions to 6 GHz in broadband and band specific designs. Output power combinations range from tens of watts to multi-kilowatts. Unprecedented size, weight and power reduction of our amplifiers is superior to anything in the market at similar frequencies and power levels ...

RFID Patent Enables Increased Bit Density & Lowering Costs of Tags

RFID Patent Enables Increased Bit Density & Lowering Costs of RFID - RF Cafe"Vubiq Networks has filed its fourth millimeter wave RFID patent application with the U.S. Patent and Trademark Office. The application is entitled System and Method for High-Bit Density Millimeter Wave Chipless RFID and has been assigned the application number 62775479. The patent application defines advanced, high-bit density chipless RFID technology using the company's polarimetric synthetic aperture radar (SAR) technique that incorporates polarization and phase detection. The technology will provide orders of magnitude higher bit density for RFID tags as compared to 'prior art' or other competitive approaches. The application, which is the fourth RFID patent ..."

Sunday 16

RF Cafe Engineering & Science Crossword Puzzle December 16

RF Cafe Engineering & Science Crossword Puzzle December 16, 2018Each week, for the sake of all avid cruciverbalists amongst us, I create a new technology-themed crossword puzzle using only words from my custom-created lexicon related to engineering, science, mathematics, chemistry, physics, astronomy, etc. You will never find among the words names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort. You might, however, see someone or something in the exclusion list who or that is directly related to this puzzle's theme, such as Hedy Lamarr or the Bikini Atoll, respectively. This week's crossword contains a shameless plug for my custom software products - they're inexpensive and will save you a lot of time ...


Please Visit Triad RF Systems to Thank Them for Their Support

Triad RF SystemsTriad RF Systems designs and manufactures RF power amplifiers and systems. Triad RF Systems comprises three partners (hence 'Triad') with over 40 years of accumulated knowledge of what is required to design, manufacture, market, sell and service RF/Microwave amplifiers and amplifier systems. PA, LNA, bi-directional, and frequency translating amplifiers are available, in formats including tower mount, benchtop, rack mount, and chassis mount. "We view Triad more as a technology partner than a vendor for our line-of-sight communications product line." Please check to see how we can help your project ... Please check to see how they can help your project ...

How to Use Filter Equations in Software and Spreadsheets


Chip with Micro-Hotplate for Self-Healing and Sustainable Electronics

Chip with Micro-Hotplate for Self-Healing and Sustainable Electronics - RF Cafe"This invention is an on-chip immune system against hot-carrier stress, bias temperature instability, and total ionizing dose degradation. Ames Research Center, Moffett Field, California Heat treatment, also known as annealing, is a common step in the semiconductor fabrication process. A buildup of radiation-induced localized charge within the semiconductor and insulator alters local field distribution, threshold voltage, and leakage current. NASA's patent-pending technology implements an annealing process on a system level directly on a chip for annealing defects and improving device performance with heating done in the laboratory. The annealing may be performed inside an oven or upon a hotplate ..."

Radio & Wireless Week (RWW) 2019

Radio & Wireless Week (RWW) 2019 - RF CafeRadio & Wireless Week (RWW) 2019 runs January 20-23, at the Rosen Plaza Hotel in Orlando, Florida. The venue is located in one of the world's most visited tourist destinations. RWW consists of five related conferences that focus on the intersection between wireless communication theory, systems, circuits, and device technologies. This creates a unique forum for engineers to discuss various technologies for state-of-the-art wireless systems and their end-use applications. ARFTG also joins RWW2019 as a co-located conference. Authors are invited to submit papers for presentation at RWW2019. All papers accepted ...












Shape-Shifting Origami Helps Antennas Adapt on the Fly

Shape-Shifting Origami Helps Antennas Adapt on the Fly - RF Cafe"Researchers at the Georgia Institute of Technology have devised a method for using an origami-based structure to create radio frequency filters that have adjustable dimensions, enabling the devices to change which signals they block throughout a large range of frequencies. The new approach to creating these tunable filters could have a variety of uses, from antenna systems capable of adapting in real-time to ambient conditions to the next generation of electromagnetic cloaking systems that could be reconfigured on the fly to reflect or absorb different frequencies. The team focused on one particular pattern of origami, called Miura-Ori, which has the ability to expand and contract like an accordion ..."

Topological Material Switched off & on for 1st Time

Topological Material Switched off & on for 1st Time - RF Cafe"Over the last decade, there has been much excitement about the discovery, recognized by the Nobel Prize in Physics only two years ago, that there are two types of insulators: normal insulators which don't conduct electricity, and topological insulators - newly discovered materials that conduct electricity only on their edges. Now, FLEET researchers at Monash University, Australia, have for the first time successfully 'switched' a material between these two states of matter via application of an electric-field. This is the first step in creating a functioning topological transistor - a proposed new generation of ultra-low energy electronic devices. Ultra-low energy electronics such as topological transistors would allow computing to continue to grow, without being limited by available energy as we near the end of achievable improvements in traditional ..."















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Copyright: 1996 - 2018
    Kirt Blattenberger,

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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