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 up-and- ...
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 ...
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 ..."
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 and
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 ..."
"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 ..."
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
in the 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 ...
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 ...
"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 ..."
"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 ..."
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 firstname.lastname@example.org. 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.
For the sake of all the avid cruciverbalists amongst
us, each week 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! ...
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 ...
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 ...
"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
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 ...
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 available bandwidth of RF channels are often
limited by the bandpass characteristic of filters, amplifiers and mixers. Detecting amplitude
flatness and phase distortion is crucial in characterizing the quality of a transmission
channel. The amplitude flatness within the used bandwidth may have an influence on the
signal quality. Knowledge about phase distortion is essential to maintain low bit error
rates in data transmissions and VNAs commonly perform amplitude flatness and phase distortion
Cool Products images folder
"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 ..."
"Narrowband Internet of Things (NB-IoT) has reached
critical mass as network operators all over the world have announced their deployment
plans. Last year, the NB-IoT market was driven by a handful of operators, primarily in
Asia and Europe. U.S. operators Verizon, Sprint and T-Mobile have started to fast track their
NB-IoT development. By the end of 2018, most of the U.S., Europe
and Asia Pacific will be covered by at least one NB-IoT network. Despite the early lead
by unlicensed Low Power Wide Area ..."
"In a new study, researchers from the U.S. Department
of Energy's (DOE) Argonne and Brookhaven National Laboratories observed the formation
of two kinds of defects in individual
nanowires, which are smaller in diameter than a human hair. These
nanowires, made of indium gallium arsenide, could be useful for a wide range of applications
in a field scientists have termed optoelectronics, which encompasses devices that work
by converting light energy into electrical impulses. Fiber optic relays are a good example ..."
Spark Kicks off 5G Era in New Zealand with
"New Zealand telecom operator Spark announced
what it claims to be the country's first
live 5G mobile test site in Wellington. The 5G trial used equipment
and technical support from Chinese vendor Huawei. It will test speeds, coverage and the
parameters of the spectrum in a real-world environment, and run throughout March connecting
equipment in a specialized vehicle drive-testing the streets of Wellington. 'We intend
to be at the forefront of deploying this technology in New Zealand once ..."
"Millimeter wave signals were more found to be more robust than expected
and provided high speeds - although not gigabit speeds - at distances of several thousand
feet from a node, Signals Research Group found in recent testing of Verizon's 28 GHz
fixed wireless access network in Houston. 'Millimeter wave signals are far more resilient
than we expected, even at distances exceeding several thousand feet. Tree foliage, passing
school buses, buildings, glass ..."
"It defies conventional wisdom about semiconductors.
It's baffling that it even works. It eludes physics models that try to explain it. This
newly tested class of
light-emitting semiconductors is so easy to produce from solution
that it could be painted onto surfaces to light up our future in myriad colors shining
from affordable lasers, LEDs, and even window glass. These materials are very radiant.
The nagging question of whether hybrid organic-inorganic perovskites (HOIPs) could really
work just ..."