Category Archives: impedance

Shoot the Moon with this Homebrew Hardline RF Divider

You can say one thing for [Derek]’s amateur radio ambitions — he certainly jumps in with both feet. While most hams never even attempt to “shoot the Moon”, he’s building out an Earth-Moon-Earth, or EME, setup which requires this little beauty: a homebrew quarter-wave hardline RF divider, and he’s sharing …read more

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Posted in amateur radio, Coax, dielectric, Earth-Moon-Earth, EME, ham, hardline, impedance, moon bounce, radio hacks, transformer | Leave a comment

Complex Impedences Without The Pain

Any grizzled electronic engineer will tell you that RF work is hard. Maintaining impedance matching may be a case of cutting wires to length at lower frequencies, but into the low centimetre and millimetre wavelengths it becomes a Dark Art aided by mysterious and hugely expensive test equipment beyond …read more

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Posted in complex impedance, impedance, radio hacks, RF, vna | Leave a comment

Video: Putting High Speed PCB Design to the Test

Designing circuit boards for high speed applications requires special considerations. This you already know, but what exactly do you need to do differently from common board layout? Building on where I left off discussing impedance in 2 layer Printed Circuit Board (PCB) designs, I wanted to start talking about high speed design techniques as they relate to PCBs.  This is the world of multi-layer PCBs and where the impedance of both the Power Delivery Network (PDN) and the integrity of the signals themselves (Signal Integrity or SI) become very important factors.

I put together a few board designs to test …read more

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Posted in angular frequency, bandwidth, bil herd, Communications Signal Analyzer, CSA803, dielectric, EM Field, Engineering, fast rise time, Featured, glass weave, high speed, High Speed Design, impedance, pcb, return current, tdr, tool hacks | Leave a comment