"Miniature MEMS-based speakers could revolutionize
speech and music reproduction in mobile communication devices. They combine the advantages
of a large frequency bandwidth and high acoustic quality with the ability to generate
very high sound levels. Nevertheless, they are so tiny that they can be integrated into
headphones. Such micro-loudspeakers were developed by the Fraunhofer Institutes for Digital
Media Technology (IDMT) and Silicon Technology (ISIT). MEMS technology stands for microelectromechanical
systems and combines classical ..."
Microwave Journal is conducting along with National
Instruments and Wolfspeed a webinar titled, "Introduction to Radar," on Wednesday, March 28, 2018, at 11:00 AM.
Mr. Scott Bullock presents on the topics of radar detection and ranging, pulse vs. CW,
radar modulation, radar path budget, basic radar equation, radar range equation, range
ambiguity and mitigation, maximum and minimum detectable range, and more ...
"While the mobile industry is done with its annual
Mobile World lovefest - held last month in Barcelona - tech suppliers, system OEMs, and
mobile operators now face a host of 5G obstacles not yet overcome. In fact, they’re just
getting started. The technical issues of 5G are manifold. Among them, smart antennas
front ends for 5G mmWave - typically expected to operate at frequencies such as 28
GHz, 39 GHz, or 60 GHz - could seriously affect the performance of yet-to-emerge 5G mmWave
mobile phones ..."
In an ongoing effort to provide the best return
on investment to RF Cafe website sponsors (aka advertisers), I have decided to allocate
the 728x90-pixel banner ad slot at the bottom of all web pages to companies who participate
High Exposure plan. That is in addition to the other features that have always been
included. The cost is still only $150 per month; i.e., no price increase. A full list
of advertising options is available on the Sponsorship
Rates page, but just the features which are part of the High Exposure plan are highlighted
in the screen capture ...
"During Exercise Northern Warrior 2018, 35 Canadian
Brigade Group (35 CBG) Communications Detachment did an impressive job of testing and
solving problems. The detachment's two objectives were to provide high-quality communications
to the Arctic Response Company Group (ACG) personnel and test new equipment in an arctic
environment. 'The arid and austere environment of the Canadian Arctic requires effective
communications. The work done by the G6 35 GBC team has undoubtedly demonstrated the
relevance of the
HF communications that are essential to operate effectively in this
hostile climate ..."
Earthlink no longer provides Internet service in the
Erie area, and they want to charge a monthly fee to retain the current e-mail address,
which is not worth the expense. Accordingly, please note that effective immediately
RF Cafe's primary e-mail address will be email@example.com. The Earthlink e-mail
will be kept for a month or two so as not to miss any useful message, but please begin
using the Yahoo e-mail now. I apologize for any inconvenience.
Steve Ellis, product manager at Pasternack, wrote
an article titled, "Methods of Suppressing PIM in Multicarrier Systems," that appeared
in the February 2018 issue of Microwaves & RF magazine. "Passive intermodulation
distortion (PIM) - the nonlinear effects that are observed from the passive components
(i.e. antennas, cables, connectors, power dividers, and mixers) of a system at high signal
levels - is a phenomena of particular relevance in wireless infrastructures dedicated
to the propagation of vast amounts of traffic. Cellular and ...
Everyone who is interested enough in microwave
diodes to read this article surely knows* what IMPATT, GUNN, and PIN diodes are, but
have you heard of Read-effect, TRAPATT, LSA, or QMD diodes? If not, it is likely because
you entered the microwaves field long after 1969 when this edition of Electronics
World was mailed to subscribers. Device improvement and obsolescence accounts for
familiarity with the former and unfamiliarity with the latter, respectively. The article
below by two Sylvania Electronic Products engineers describes the properties of various
Here is a brand new book being offered by the ARRL:
Receiving Antennas for the Radio Amateur, by Eric P Nichols
(KL7AJ). "Although the fundamental characteristics of antennas apply to both transmission
and reception, the requirements and priorities of receiving antennas can be vastly different
from those of transmitting antennas. Receiving Antennas for the Radio Amateur focuses
entirely on active and passive receiving antennas and their associated circuits. There
are relatively few cases where a radio amateur ..."
"Satellite communications have been in use for
decades now, providing connectivity to remote areas, acting as backup in disaster relief
situations, and being a major access mechanism for TV in certain parts of the world.
Satellite use has been vital for government, military, and remote operations, while geostationary
orbit (GEO) satellites are providing global coverage for voice, TV, and, in some cases,
broadband Internet services. The
telco industry is now working toward the standardization and commercialization
of the next generation of cellular standards ..."
A lot of RF Cafe visitors might not be familiar
with some of the electronic devices presented in this
Electrochemistry Quiz by Popular Electronics' resident quizmaster, Robert
Balin (a big list of his other quizzes is at the bottom of the page). I offer my
assistance. A is a photocell, B is an early type of rectifier, C is a varistor, D is
a cathode ray tube (CRT), E is an electrolytic capacitor, F is a heated cathode in a
vacuum tube, G is a flashlight battery, H is an early receiver crystal detector, I is
a magnetic audio recording tape, and J is phonograph cartridge. I scored ...
"Measurements of the three-dimensional structure
of the earth, as opposed to the one-dimensional models typically used, can help scientists
more accurately determine which areas of the United States are most vulnerable to blackouts
geomagnetic storms. Space weather events such as geomagnetic storms
can disturb the earth's magnetic field, interfering with electric power grids, radio
communication, GPS systems, satellite operations, oil and gas drilling and air travel.
Scientists use models of the earth's structure and measurements of Earth's ..."
Each 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 Lamar or the Bikini Atoll, respectively. Enjoy! ...
Here are a couple more
electronics-themed comics from the March 1967 issue of Popular Electronics
magazine for your TGIF enjoyment. The comic on page 100 especially appeals to me since
I am finishing the installation of a Channel Master CM-5020 antenna. It has been a long
time since I installed a traditional style TV antenna - about 40 years ago when I put
a Radio Shack antenna on the roof of my mother's house. The entire 109" long by 100"
wide antenna, including mounting hardware, weighs only 11.5 pounds and presents
a wind resistance of 30 pounds. This is Channel Master's best antenna ...
iHeartMedia Files for Bankruptcy
Digital Ad Fraud Growing by the Nanosecond
Nokia Urges U.S. to Hurry up and Set 5G Spectrum Auction Calendar
Tennessee Middle School Students Will Send CubeSat into Space
Some Americans 'Constantly' on Internet, Others Remain Offline
Smart Antenna Market to be Worth $8.95B by 2025
Time for a Reality Check to 5G Exuberance
Trump Pushes for New "Space Force"
Tower Mounted Amplifier Market to See Decade of Growth
"Researchers have produced a 'human scale' demonstration
of a new phase of matter called quadrupole topological insulators that was recently predicted
using theoretical physics. These are the first experimental findings to validate this
theory. The researchers report their findings in the journal Nature. The team's work
with QTIs was born out of the decade-old understanding of the properties of a class of
materials called topological insulators. 'TIs are electrical insulators on the inside
Arecibo Observatory in Puerto Rico has been saved following an agreement
signed by a consortium led by the University of Central Florida (UCF) in Orlando. The
announcement was made on 22 February by the National Science Foundation (NSF), which
has been looking for an alternative sponsor for the iconic, 305 m-diameter radio telescope
since 2006. The NSF currently spends around $8M a year to keep Arecibo operating. The
final impetus for the NSF to find new funding sources came in September 2017 when the
telescope was damaged by Hurricane Maria ..."
The 8th RF & Microwave Paris Exposé will be held March 21 & 22,
2018, at Porte de Versailles, Paris, France. Vendors will have products on exhibit, and
conferences include EMC and RF simulation, IoT and Radio, Reliability of Components and
Electronic Systems, GaN for Microwave Applications , Antennas Made by 3D Printing, GaN
for Microwave Applications, Evolution ...
"BAE Systems Australia today welcomed the announcement
by the Minister for Defence, Senator the Hon Marise Payne and the Minister for Defence
Industry, the Hon Christopher Pyne that the Company has been selected to upgrade Australia's
long-range high frequency radar network. The
Jindalee Operational Radar Network (JORN) protects Australia's coastal
approaches through a network of three remote radars in Queensland, Western Australia
and the Northern Territory. The radars play a vital role in supporting the Australian
Defence Force's air and maritime ..."
Mac and Barney discuss with some degree of trepidation
the alarmingly increasing rate at which new
electronics technology is being developed and marketed. As service shop owner and
technician, respectively, they needed to constantly educate themselves on new components
and circuits in order to stay current and be efficient enough to turn a profit. Mac recounts
his lengthy background beginning with the days of mainly battery-powered AM radios, and
progressing through AC-DC, FM and all-band (shortwave) radio, B&W television and
the color TV, CB radios, and a new breed of appliances with electronic controls ...
"The U.S. communications agency says tiny Internet
of Things satellites from
Swarm Technologies could endanger other spacecraft. On 12 January,
a Polar Satellite Launch Vehicle (PSLV) rocket blasted off from India's eastern coast.
While its primary cargo was a large Indian mapping satellite, dozens of secondary CubeSats
from other countries traveled along with it. Seattle-based Planetary Resources supplied
a spacecraft that will test prospecting tools for future asteroid miners ..."