The ÆtherCzar Blog


My Virginia Tech Talk: Energy Flow in Reactive Fields

Smith Chart of the near-field impedance for a magnetic dipole (top) and electric dipole (bottom).

I will visit Virginia Tech on Monday March 13th to give an EM seminar on “Energy Flow in Reactive Fields” at 1:00PM in the Whittemore 654 conference room.

  • Slides: https://prezi.com/f_2md1molwhp

Abstract:  Energy Flow in Reactive Fields

Conventional wisdom treats radiation as a transverse kink in a field line and classifies the “near field” by where it appears: “near” a source. A closer examination of electromagnetic fundamentals reveals a different picture.

Electromagnetic waves propagate at the speed of light and comprise a balance of electric and magnetic energy. The free space impedance, 377 ohms, relates the electric and magnetic field intensities. When that balance is disturbed, there is an excess of electric or magnetic energy, and the energy slows down. In the limit where fields are purely static, the energy is at rest. By characterizing fields according to their impedance, we discover that “near,” or more properly, “reactive” fields exist all around us, and electromagnetic energy curves, bends, and behaves in counterintuitive ways.

These insights are crucial to understanding how radiation works – the transformation of bound electromagnetic energy into radiant energy. This talk considers radiation from an accelerating charge and from a dipole source to illustrate the fundamental point that the propagation of fields and the flow of energy behave differently, and each offers unique insights to how electromagnetic systems behave.

Finally this talk considers the application of reactive energy flow to understand not only the behavior of electrically-small antennas, but also the puzzle of two-slit interference in the context of quantum mechanics.


A Rambling Wreck Update

Leading a Cub Scout campfire program.

As you will have noticed, I’ve suspended blogging to work on other projects. I’ve spent my blogging time scouting instead. I will be a den leader and complete my “Wood Badge” ticket in the coming year. A wise friend, vigilante author Robert Bidinotto (whose vigilante thrillers you ought to check out), suggested I was better off working on my sequel than trying to promote my debut novel. I took his advice. It’s cost sales in the short run, but I’m hopeful expediting my sequel will make up for it in the long run.

I’ve been making good progress on A Rambling Wreck, sequel to The Hidden Truth. I’m about 50,000 words into my draft. I’m aiming for a release before LibertyCon June 30-July 2, but even if I miss that date, I’ll be done by the end of the summer. Expect a sample chapter soon. For now, I’ll reveal the first page of A Rambling Wreck:

Chapter 1: Whatever Happened to Angus McGuffin?

It was Angus McGuffin’s last day on earth, but he didn’t realize it until too late.

 

Between the salacious speculation why a missionary might frequent so seedy a neighborhood and the ample amounts of blood from the slaying, the Atlanta press was all over the case. “Missionary Slain,” the headline proclaimed. The details of Hitler’s latest aggression pushed the article below the front page fold of the next morning’s Atlanta Constitution. McGuffin almost ended up an unknown John Doe in a pauper’s grave. A fellow Presbyterian had recognized McGuffin’s picture in the evening’s Atlanta Journal from a church “Jubilee” held in 1913, and church leaders confirmed the identification. Was it just a random slaying? Who would want to kill a humble missionary back in the country after a quarter century abroad? Why was McGuffin living under an assumed name at a hotel? The reporter, Jack Sweeney, clearly knew there was more to it. His article had more questions and speculation than answers.

 

I already knew much more than appeared in Sweeney’s decades-old article. In the weeks before his brutal demise, McGuffin had completed a manuscript, “Suan Ming or the Art of Chinese Fortune Telling.” He sent a bound proof inscribed to his friend, “Bill,” at the Tolliver Technical Institute. The fire that “coincidentally” consumed the Magnolia Publishing Company the day McGuffin’s body was found probably accounted for the rest of the copies. The Civic Circle’s Technology Containment Team, or whatever they were calling it way back then, must soon have secured any remaining copies or notes.

 

All but one.

 

Forgotten over sixty years in my hometown up in the mountains of eastern Tennessee, that last remaining copy gathered dust on a shelf in the Tolliver Library until that library, too, burned to the ground last year. Only we got there first, and preserved McGuffin’s legacy. Now, I was trying to piece together the puzzle of whatever happened to Angus McGuffin. Because, the people who killed Angus McGuffin also killed my parents.

Pete and Amit are off to Georgia Tech to continue their research into the real meaning of the hidden truth, and to prepare themselves for the coming battle. Only, their enemies are busy, also, with a scheme to corrupt and subvert the school. Our heroes will have to find a way to enlist the help of George P. Burdell, himself, to save the school, thwart an ancient and deadly cult, unlock the secret meaning of the hidden truth, and somehow find the time to study for their final exams. With new enemies, new allies, new challenges, and new mysteries to unravel, fans of The Hidden Truth will not be disappointed.


The Hidden Truth “Updates the Classical Arguments of Heinlein and Rand”

hiddentruth800The Hidden Truth  has earned some great reviews. Here’s one of the latest:

on October 16, 2016

What an enjoyable read! Hans’s story pulls you in and won’t let you go until the end. I was already familiar with his expertise in electromagnetics, which is sprinkled throughout the book. But I had no idea he knew so much about computer hacking and the art of picking up girls!

All fun aside, this book has a more serious purpose – it is an impassioned plea in support of libertarian principles. In this respect, Hans updates the classical arguments of Heinlein and Rand for a more modern and younger audience. Maybe this time it will work – one can only hope!

Hans’s technical books have already made him famous in electromagnetics. It seems likely that his fiction will extend his notoriety outside that narrow area. Bravo for this first effort! I look forward to many more.

The Hidden Truth is available on Amazon.

 


CLFA’s October Booknado!

booknado-grfx-600wideIt’s time for the October Booknado from the Conservative Libertarian Fiction Alliance!

The organizers even let me in again with my book on the biographies of John Charles Fremont, but I wouldn’t hold that against their other outstanding selections!

Best of all, when you buy using these links, you support CLFA through the Amazon affiliate program. Without further ado, here are the featured works:

New Releases


Rachel and the Many-Splendored Dreamland (The Books of Unexpected Enlightenment Book 3) by L. Jagi Lamplighter
Third Book of Unexpected Enlightenment: It’s Halloween at the Roanoke Academy for the Sorcerous Arts, and Rachel Griffin is stirring up the dead! (See “$1.99 or Less” category below to get Book 1 – currently FREE.)


Dragonblood: A Collection of Short Stories by Sarah A. Hoyt
From the trenches of WWI where the Red Baron just can’t help turning into a dragon, to the desert sands of a future world where humans have become something else, from a coffee shop between worlds where magicians gather, to a place where your worst nightmare can love you, let Dragon Blood take you on a series of fantastic adventures.


Mexican Hat Trick by T.S. O’Neill
A Private Investigator with an eidetic memory heads to Mexico to investigate the death of an informant involved in trademark counterfeiting.


A Place Outside the Wild by Daniel Humphreys
Eight years after Z-Day, the surviving remnants of mankind face the unknown.


Advance to Contact (Warp Marine Corps Book 3) by C.J. Carella
As war rages on across the galaxy, a diplomatic mission turns into a desperate fight for survival.


Miss Marianne’s Disgrace (Scandal and Disgrace) by Georgie Lee
Will the benefits of a partnership with this disgraced beauty outweigh the risks of scandal?


Discovery by Karina Fabian
Humanity’s first contact with beings from beyond the solar system is bound to unlock the mystery of life in the universe, but the crew have their own secrets; hidden fears, desires, horrible sins – and a mission to kill.


Cindy’s Story by Duane L. Martin
Cindy finally found something she was good at when she went to work as an assistant to a private investigator. Now if she can just keep from killing her annoying boss and his even more annoying sister, she’ll be doing ok…


Sad Puppies Bite Back by Declan Finn
Based on a true story, then completely twisted.


Echoes of Liberty (The Clarion Call Book 2) by multiple authors (anthology)
History rings with the notes of liberty- if we know how to listen. Echoes of Liberty presents 16 stories of liberty from our past, or the past that might have been, in an anthology of speculative, historical fiction.


Flames of Nevyana by Edward Willett
When sacred objects for channelling Blue Fire are stolen, sworn enemies Petra, Amlinn, and Jin set out to find them, and their paths converge on a collision course with the truth.


Birthright: The Complete Trilogy by Rick Partlow
Caleb Mitchell is a human weapon, engineered into a biologically enhanced killing machine in the war with the alien Tahni. The war is long over and now he just wants to live a normal life as a constable on his homeworld of Canaan…but his life is torn apart when a Corporate Council mineral scout comes to him with a tale of discovering incredibly advanced alien technology from the fabled race known only as the Predecessors.


Days of Future Past – Part 1: Past Tense by John Van Stry
Paul’s instructor just got drafted by some mystical goddess to help save a world. As for Paul? Well, he’s really not supposed to be there, and if he thought he was having a bad day before all of this, it just got worse, a lot worse. He’s now on a one way trip, forced to help a man who despises him while at the mercy of the world’s biggest trickster.


Van Ripplewink: You Can’t Go Home Again by Paul Clayton
48 years dead, seventeen year old Van Ripplewink wakes in a dark, muddy field…

$1.99 or Less (October 17 & 18)*


Light in the Darkness: A Noblebright Fantasy Boxed Set by multiple authors
Twelve noblebright fantasy novels of beauty and wonder! Noblebright fantasy characters have the courage to risk kindness, honesty, integrity, and love; to fight against their own flaws and the darkness of the world around them; and to find hope in a grim world.


The Unexpected Enlightenment of Rachel Griffin (Books of Unexpected Enlightenment Book 1) by L. Jagi Lamplighter  FREE!
Curiosity may kill a cat, but nothing stops Rachel Griffin! “Fringe meets Narnia at Hogwarts”


The Good Fight by Justin Robinson FREE! 
Toronto is a crowded place. Plenty of eyes and ears all around. Plenty of chances to be overheard. Be careful what you say…


The Biographies of John Charles Fremont by Hans G. Schantz
John Charles Fremont, first Republican candidate for President in 1856, led a colorful life that made him vulnerable to allegations of scandal – claims of illegitimate birth, secret Catholicism, even cannibalism – and some of these claims were actually true.


Best of the Blogroll

A few reasons why you should come back daily to check out the ÆtherCzar Blogroll:

Enjoy!

 


The September Booknado from CLFA!

booknado-grfx-600wideIt’s time for the September Booknado from the Conservative Libertarian Fiction Alliance!

I haven’t read all of these but I was impressed with last month’s selections – including The Hidden Truth! Best of all, when you buy using these links, you support CLFA through the Amazon affiliate program:

NEW RELEASES

The Sacred Stars (The Shadow Space Chronicles Book 4) by Kal Spriggs
Ensign Alannis Giovanni must confront alien foes and enemies from her past to save the lives of her shipmates and unravel a mystery ten thousand years in the making.

Woe for a Faerie: Keepers of New York (Book One) by B. Brumley
One choice changed my world…

Torchship Pilot by Karl K. Gallagher
When war breaks out, a freighter crew has to do missions a warship can’t do.

A Moon of Their Own by Dwight R. Decker
Trapped in an orbiting theme park gone mad, teenage cousins have to find a way home again.

The Lesser Sin by D.B. Corey
The Sinner Is Here. Someone’s time is up.

Ignite: Book Three of the Resistance Series by Tracy Lawson
Revolution seems impossible, until it becomes inevitable.

Out of the Dell (Waking Late Book 2) by Laura Montgomery
A lost starship. A lost colony. A band of awakened sleepers.

Wolf Killer (The Hammer Commission) by John Van Stry
The government has finally decided it needs its own agency for dealing with paranormal crime. And Mark has been sent to train them.

BARGAINS ($1.99 or less)*

Red Queen: The Substrate Wars 1 by Jeb Ninnison
Student rebels invent quantum transport, take on the fascist future US Government. 99¢

Underlake by Kia Heavey
In the throes of growing up and growing apart, Katie discovers the most unusual boy swimming in her lake and for the first time in memory, she connects. 99¢


Welcome Home Apollo 12 1

In 2002, astronomers noted that the Earth acquired a new “moon,” dubbed J002E3. Such orbits are unstable in the long run, due to the likelihood of interactions with the Earth and Moon perturbing the orbit of such a small object. As observational data continued to accumulate, it became obvious that this object had some peculiar characteristics. It’s orbit was strongly perturbed by the pressure of solar radiation, indicating the object was not very dense.

j002e3f_orbit

The motion of J002E3, showing how the object was captured into its chaotic orbit around the Earth by passing near the L1 point, looping around the Earth for 6 orbits, and then leaving Earth’s orbit. The Sun is to the left in these animations (NASA/Paul Chodas & Ron Baalke, 2002, Public Domain; Courtesy Wikimedia)

As the object continued an elaborate dance of a half dozen orbits around the Earth and Moon, observations indicated light reflected by the object was consistent with the spectral characteristics of white paint, black paint, and aluminum.

as17-148-22714_crop

S-IVB stage of Apollo 17, identical to that from Apollo 12 (NASA, Public Domain, 1972, courtesy Wikimedia).

Although the orbital motions and interactions with solar radiation make the object’s orbit too chaotic to trace with a high degree of certainty, backtracking its orbit led to the conclusion that it had last been in the vicinity of the Earth in 1971. Scientists believe the object is the missing third stage of Apollo 12.

After a half dozen orbits of the Earth, a close pass with the moon perturbed the object back into a heliocentric orbit around the sun. Scientists estimate another close approach sometime in the 2040’s.


Video Lecture: Energy Flow in Reactive FIelds

A couple of weeks ago, I traveled to the UK to attend the Logistics Research Network Conference and present some talks. One, presented at the James Clerk Maxwell Institute and Newcastle University, explained my ideas on energy in reactive fields. The kind folks at Newcastle University have posted a video of my talk.

schantznewcastle

Dr. Hans G. Schantz presenting “Energy Flow in Reactive Fields” at Newcastle University on 6 September, 2016 (courtesy Fei Xia).

My talk proposes a novel definition of near or reactive fields by reference to the electromagnetic Lagrangian and reviews basic concepts including energy velocity, energy flow, and impedance from a reactive perspective. Schelkunoff’s 1-D transmission line concept serves as a simple conceptual framework within which to understand the behavior and motion of energy in the context of opens, shorts, and other basic examples. Application of these concepts to the dipole fields reveal fundamental properties of small antennas including quality factor and gain limits. Finally, these ideas have practical applications in understanding the different behavior of electric and magnetic antennas, in employing near-field wireless links, and elsewhere in physics.

The Art & Science of UWB Antennas

The Art & Science of UWB Antennas

Here’s a link to my slides.

If you are interested in learning more about time domain electromagnetics and near-field or reactive energy flow, you may be interested in my book, The Art and Science of UWB Antennas. Click through for more information including an opportunity for a 25% discount.


Best of the Blogroll

Latest great links from the ÆtherCzar Blogroll:

Enjoy!


Low-Frequency Real-Time Location for Logistics and Other Applications

I’m speaking at 9:45 this morning at the 21st LRN Annual Conference and PhD Workshop, sponsored by the Logistics Institute at the Wilberforce Building on the campus of the University of Hull. My topic is “Low Frequency Real-Time Location for Logistics and Other Applications.” My slides follow:


Near-Field Wireless Technology

UniversityofHullThe Communications Research Group at the University of Hull graciously invited me to speak on the subject of “Near-Field Wireless Technology.” My hosts inform me that the seminar will start with refreshments, posters and informal discussion from 2.00pm with a 2.30pm start for the main seminar. We should finish about 3.45pm. The venue (to be confirmed) will be Lecture Theatre B in the Robert Blackburn Building at the University of Hull. My slides follow:

The Communications Research Group has research interests in UWB antennas, logistics technologies (including location systems) and Cognitive Radio Systems. The aim of the seminar is to bring together, for informal discussion, researchers and industrialists in these and related fields.

The Art & Science of UWB Antennas

The Art & Science of UWB Antennas

If you are interested in learning more about time domain electromagnetics and near-field or reactive energy flow, you may be interested in my book, The Art and Science of UWB Antennas. Click through for more information including an opportunity for a 25% discount.

 

 


The Electromagnetic History of Newcastle

Lit-and-Phil-Newcastle

The “Lit&Phil,” Newcastle-Upon-Tyne, where Oliver Heaviside began his study of electricity and magnetism (photo by ÆtherCzar).

Newcastle-Upon-Tyne holds a key place in electromagnetic history. Founded in 1793, the “Lit & Phil,” or Literary and Philosophical Society of Newcastle, is the largest independent library in the UK outside London, housing over 160,000 books. It was at the Lit & Phil that a humble telegrapher, Oliver Heaviside, first studied Maxwell’s theory of electricity and magnetism. Heaviside went on to “make patent what was latent” in Maxwell’s sometimes obscure theory, reducing it to the four “Maxwell’s Equations” employed by physicists and engineers to this day.

Heaviside’s own works – freshly rebound – grace the shelves there, embedded among some of the very texts the young student of electricity and magnetism would have encountered well over a century ago.

Heaviside-at-Lit-and-Phil

Newcastle’s electromagnetic claim to fame does not end at Oliver Heaviside, however. Joseph Wilson Swan demonstrated his light bulb in 1878. A few months later, on February 3, 1879, he demonstrated his bulb in a lecture at the Lit & Phil. Swan’s lightbulb is on display at the Discovery Museum.

Swan-Bulb-Newcastle


Newcastle Electromagnetics Interest Group: Energy Flow in Reactive Fields 1

nemigThis morning, I will present a talk, Energy Flow in Reactive Fields, at Newcastle University, hosted by the Newcastle Electromagnetics Interest Group. I’m scheduled for 11am to 1pm at The Buttery, Merz Court, School of Electrical and Electronic Engineering. Here’s the official flyer:Schantz-Energy-Flow-NewcastleHere are my slides:

And here’s my abstract:

Energy Flow in Reactive Fields
Hans G. Schantz, CTO
Q-Track Corporation, USA

This talk proposes a novel definition of near or reactive fields by reference to the electromagnetic Lagrangian and reviews basic concepts including energy velocity, energy flow, and impedance from a reactive perspective. Schelkunoff’s 1-D transmission line concept serves as a simple conceptual framework within which to understand the behavior and motion of energy in the context of opens, shorts, and other basic examples. Application of these concepts to the dipole fields reveal fundamental properties of small antennas including quality factor and gain limits. Finally, these ideas have practical applications in understanding the different behavior of electric and magnetic antennas, in employing near-field wireless links, and elsewhere in physics.

I spoke previously at Newcastle in 2014 on the topic: “The Time Domain, Superposition, and How Electromagnetics Really Works.” A video of my earlier presentation is available at the link.

The Art & Science of UWB Antennas

The Art & Science of UWB Antennas

If you are interested in learning more about time domain electromagnetics and near-field or reactive energy flow, you may be interested in my book, The Art and Science of UWB Antennas. Click through for more information including an opportunity for a 25% discount.


A Visit to the James Clerk Maxwell Institute 1

James Clerk Maxwell (1831-1879) formalized a set of equations that describe the behavior and interaction of electricity and magnetism.

James Clerk Maxwell (1831-1879) formalized a set of equations that describe the behavior and interaction of electricity and magnetism.

Today, I will be visiting the James Clerk Maxwell Foundation in Edinburgh. The foundation occupies the Edinburgh house on India street in which Maxwell was born in 1831. The foundation’s objectives are:

  • To provide in the birthplace an attractive and stimulating environment for the mathematicians, scientists and engineers from all over the world to meet in seminars, symposia, workshops and courses.
  • To display the history of Maxwell’s family and his many technical advances, as a simple museum, within his birthplace.
  • To develop programmes to encourage young students to become  mathematicians, scientists and engineers.  Research and travel grants are made to young scientists.  James Clerk Maxwell prizes are awarded.
  • To increase public awareness of the foundations laid by James Clerk Maxwell for the increasingly pervasive technologies of today, e.g. through meetings, exhibitions,  lectures, and cultural events.

The foundation’s website offers a wealth of information on Maxwell and his legacy. I’m looking forward to an opportunity to discuss energy flow in reactive fields. Slides, below.

Following is an informative animation of how an impulse on a transmission line interacts with an open or a short.

Animimation of impulses interacting with an open and a short. Courtesy, Wikimedia; created by Steven Byrnes.

Animimation of impulses interacting with an open and a short. Courtesy, Wikimedia; created by Steven Byrnes.


Conan the Salaryman

It’s like Conan the Barbarian meets Dilbert.

Every workday, Conan The Salaryman provides status updates.

The transition from warrior king to corporate drone is sometimes difficult.

And no one will ever accuse Conan

But eventually, Friday comes and the week is done.

Unfortunately, Conan the Salaryman does not deign to tweet on the weekends. Follow Conan The Salaryman on Twitter, or read Robert E. Howard’s chronicle of his many adventures in this reasonably priced ($0.99) Kindle edition.


Best of the Blogroll

The latest great links from the ÆtherCzar Blogroll:

Enjoy!

If these links aren’t enough to keep you occupied, consider checking out my science fiction thriller, The Hidden Truth.

HiddenTruth-KU-v3

 


Best of the Blogroll

Latest great links from the ÆtherCzar Blogroll:

Enjoy!


Hidden Truth – The Animated GIF

I tried my hand at generating an animated GIF to promote The Hidden Truth using makeagif.com, incorporating a few of the more recent positive review comments. Here’s the result:

Hidden_Truth


Hidden Truth: “…mandatory reading for anyone interested in … online security or anonymity.”

300x250HiddenTruthv2-NCC-1776Two more excellent five-star reviews have been posted on Amazon in the past week. Here’s one of them:

A book to make you think about online security, privacy and anonymity

This is a great story with a nice McGuffin and a slightly disturbing take on modern liberalism/progressivism/statism but the real key to the story is the espionage and counter-espionage and, IMHO, it should be mandatory reading for anyone interested in the fields of online security or anonymity.

Read more!

Click through to read the rest. The author of this review is the first of the couple dozen Amazon reviewers to focus on the online anonymity aspect of my work. One of my goals in writing The Hidden Truth was to illustrate basic anonymity and information security techniques and then show how even doing almost everything perfectly, my heroes can still be found out. I also wanted to illustrate a plausible scenario by which a high school student with reasonable skill level could penetrate a state-of-the-art encrypted communication channel due to bureaucratic or social deficiencies in how the villains use their state-of-the-art system. I’m not really an information security expert and it took a good bit of effort and consultation with folks who are to try to get it right. I’m glad that effort paid off for the reviewer.


Ecclectic Histoy: Diodes, Why Sputnik Won, and Jesus’ Wife

Favicon Aetherczar Smith v3Sometimes I run into interesting nuggets of history that I want to pass on, but I don’t have enough insightful commentary of my own to add to justify a separate blog post. In this post I’ll list a few items I’ve found:

Enjoy!


Through Wall Indoor Location

Q-TrackLogoMedium

One fun aspect of working in a new technology is the harder you work, the better performance gets. The performance of Q-Track’s Near-Field Electromagnetic Ranging indoor location systems just got even better.

Bob DePierre and I started off in the ultrawideband (UWB) industry years ago – I designed antennas, and Bob work on RF front ends. We saw the problems faced by UWB location systems coping with tracking objects through walls. Even short pulse signals are prone to multipath interference, and that multipath makes it difficult to accurately localize a transmitter. That’s why Bob and I decided to investigate whether low frequency, long wavelength signals could provide a more accurate system for indoor location. The result was Near-Field Electromagnetic Ranging or NFER indoor location systems.

The latest performance we’re achieving is remarkable. Here’s a screen shot from a recent test. My colleague, John Unden, place three locator-receivers (the green dots, below) on the ground outside our building and assessed tracking accuracy throughout a 7000 square foot area of our lab environment.

The resulting track (in red) and photos of the receiver placement are below.

Q-TrackIndoorLocationAccuracyThat red line is the track showing John walking in and around our facility. Note that in all cases, the receivers are tracking through not only the exterior wall, but also at least one additional interior wall. Accuracy is on the order of 40cm, and the worst case error is no more than 1m. That’s an excellent example of the kind of robust through-wall performance Q-Track can deliver to solve your indoor location problems.

If you’d like to learn more, check out Q-Track’s website.

 


Best of the Blogroll

Latest great links from the ÆtherCzar Blogroll:

Also, the $0.99 sale continues for one more day.Thanks to everyone who’s purchased The Hidden Truth!

HiddenTruth99centsv3


August CLFA Book Bomb!

I’m delighted The Hidden Truth was selected as a featured novel in this month’s Conservative-Libertarian Fiction Alliance Book Bomb. Click through for an outstanding selection of conservative and libertarian fiction from emerging and established authors.

clfa_bookbomb_graphic

In appreciation and for further incentive, The Hidden Truth  will be available for only $0.99 for the next couple of days.

HiddenTruth99centsv2


25% Off The UWB Antenna Book! And Why You Should Buy It 2

The Art & Science of UWB Antennas

The Art & Science of UWB Antennas

I’m pleased to announced a special offer for ÆtherCzar readers and fans, courtesy of my publishers at Artech House.The Art and Science of Ultrawideband Antennas is now available at a 25% discount direct from the publisher:

  • For my US readers: $103 discounted from the regular $139 price
  • For my UK readers: £77.25 discounted from the regular £103 price

To take advantage of this offer, purchase from the Artech website as normal and apply the super-secret discount code “SCH25” at checkout.

Why should you buy my book?

I’m glad you asked!

The Art and Science of Ultrawideband Antennas is not your usual textbook. Antenna design is often regarded as a precise mathematical science: crank through some design equations, simulate, optimize and out pops an antenna. But did you chose the right equations? What assumptions did you make? What assumptions could you make that would make your design space smaller?

Step back a moment. How did the earliest investigators approach these issues? What insights did they bring to bear? Are their ideas relevant to today’s problems?

Time and again, antenna designers developed solutions to antenna problems – solutions often forgotten today. In writing about the history of ultrawideband (UWB) antennas, I refer to the “three centuries of UWB antennas.” Of course, it’s not literally 300 years of work, but I use that potential ambiguity to emphasize that the field has a long history.

The first wave of UWB technology in the nineteenth century featured planar antennas, biconical antennas, horn antennas, even millimeter wave technology – all subsequently forgotten by mainstream investigators.

The second wave of UWB antenna technology emerged in the early-to-middle part of the twentieth century as radio technology pushed to high enough frequencies and broad enough bandwidths that broadband antennas were again needed. Having forgotten the lessons of the past, investigators spent a decade or more rediscovering their predecessors’ work, applying and extending it to accommodate then-present-day problems, like radar, television, and FM communications.

The third wave of UWB technology began toward the end of the twentieth century, culminating in the FCC approval of UWB technology in 2002 and subsequent advances in antennas. Here again, much of the second wave work was forgotten and needed to be rediscovered.

My book walks you through these three waves of historical development, showing you the potentially promising dead ends, and providing hundreds of references and sources to pursue, so you can find out more from the hints and suggestions I provide. For instance, the second wave developed some wonderful 3-D optimized antenna designs. I used these ideas in developing some of the first third-wave planar commercial UWB antennas (see my blog post, “Birth of an Antenna: From Conception to Production“). Now however, planar antennas are all the rage since PCB manufacturing methods allow for low cost implementations. At the same time, there are emerging improvements in 3-D printing, and a new emphasis on even higher mm-wave frequencies with smaller wavelengths. Soon, it will again be practical to implement and manufacture 3-D antenna geometries. The pioneering work of Nils Lindenblad and others will need to be rediscovered and applied anew.  And you will have a significant advantage over your peers because you will have read my book, and you will know just where to start instead of reinventing it all from scratch.

But The Art and Science of Ultrawideband Antennas is more than just a historically-informed text that shows you how the brilliant designers of the past solved their problems. Even more fundamentally, my book is about applying time-domain methods in RF, microwave, and antenna practice. The overwhelming emphasis in engineering and physics education is on frequency-domain methods. They’re usually easier for most problems of interest. But some problems yield more readily to a time-domain approach.

In his essay, “A Different Box of Tools” collected in Surely You’re Joking Mr. Feynman, Richard Feynman explains how he came to acquire a great reputation for performing integrations. He’d picked up on an obscure technique – differentiating parameters under the integral sign – that was not in the usual curriculum. Feynman explains:

The result was, when guys at MIT or Princeton had trouble doing a particular integral, it was because thy couldn’t do it with the standard methods they had learned in school. If it was a contour integration, they would have found it; if it was a simple series expansion, they would have found it. Then I come along and try differentiating under the integral sign, and often it worked. So I got a great reputation for doing integrals, only because my box of tools was different from everybody else’s, and they had tried all their tools on it before giving the problem to me [p. 87].

In addition, my book explains electromagnetic energy flow, providing a simple and intuitive understand of how antennas really work. There are hints and pieces of what I have to offer elsewhere, but to the best of my knowledge, my book is the only comprehensive reference.

In mastering my book, you will acquire some novel and little-appreciated tools. You will be able to solve difficult problems that may elude your peers who do not have the benefit of these techniques.

Finally, I fill my chapters with worked examples that illustrate how to apply the analytical techniques. Examples include plotting fields lines for dipoles with arbitrary time dependence, developing an analytic model of an arbitrary time-domain waveform and approximating its spectrum, intuitive rules for estimating current distributions and antenna patterns without any mathematical calculation, and many more.

If you have an interest in antennas in particular or electromagnetic physics and engineering in general, I believe you’ll find my book an indispensable reference. My book is available for purchase from the Artech website. Remember to apply the super-secret discount code “SCH25” at checkout.

There are also a couple signed copies directly from the author still available for $120 + $5 S&H for U.S. residents.