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August 24, 2017
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What's new on Microwaves101?

As is always the case, we've been busy adding plenty of new features to Microwaves101. We ain't been slack, Cap'n Walker!

We hope you are enjoying your summer...  Consider visiting Death Valley the week of August 13 to get a taste of the future and find out how life feels at 125F (52C).  Even while you are on vacation, take some time to see what's new on Microwaves101 for August 2017!

  • This month, we offer a free book, Microwave Engineering and Systems Applications, by Kaul and Wolff. You can view it from a window on our site to see if you like it, then you can download it for future reference.  We personally thank Roger Kaul and Edward Wolff for their donation, and Terry for uploading it and wrapping a page around it.  Thanks!
  • We have a photo of a "Probe ping" in our microwave mortuary, thanks to Robert, and also an iphone cord  accident from Zach.  Microwaves101 pocketknives were awarded to both Robert and Zach for their fine photographs!

  • Last month we introduced a method we call how to size isolation resistors in SSPA to ensure graceful degradation and not start fires. Now we have added Rule of Thumb #127 to size the resistors in corporate Wilkinson dividers and combiners.  

  • How about a page on the topic of fiducial marks? We've got that.  Fiducials are used for alignment in lithography as well as assembly. Send us your favorite fiducial mark!

  • The math behind the 90 degree property of quadrature couplers has now been posted, thanks to Terry. Check it out, it is linked from this page.

  • We redid our page on coax power handling, after some discussions with a PhD student looking for advice on a spreadsheet. We now have a pretty good derivation of ideal impedance for maximum voltage and power handling, which takes just a small amount of calculus skills. The rule of max power for coax being 30 ohms (for air dielectric) has a caveat.  What if you allowed yourself to operate right at the onset of TE11 mode (the max frequency that TEM will propagate by itself)? It turns out, you come up with a different answer.  Go to our coax peak power handling discussion and learn about this special case, and consider taking some time to help us out with the algebra needed to prove it.

  • While we were on that coax power handling page, we offered some advice on coax average power handling, a complicated topic with no easy answers. 

  • Our conducting materials page (and all of its sub-pages) have been updated to include resistivity and conductivity in natural units of ohm-meters and Siemens/meter, for your convenience.

  • Meanwhile, on our discussion board, people are talking about microstrip to coax transitions. Here's a discussion of a problem with a particular microwave oven design. Please join our discussions, or ask your own question!
  • The Unknown Editor (and Brenda) review the recent IMS 2017 in Hawaii. Even though the official theme was "5G", we still  don't know what that is! As always at IMS, lots of good technical interchange and fun distractions were available.

Attention forward thinking microwave marketeers: check out information on advertising with us. Sponsorship information is but a click away... come and share the magic of 15,000 page views per weekday. Hey that rhymes!

As always, we want you to sign up for the MW101Stuff newsletter, or submit a photo for our Microwave Mortuary. We'd love to hear from you, whether you have nice things to say about Microwaves101.com or just want to tell us how we've ruined your life. 

Check out our What's new archive!





Author: Unknown Editor
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