Why We Don’t Like Unintended Common-Mode Current Flow On Our Transmission Lines

You may have wondered why some of us keep yammering on regarding “Common Mode Current” on the coax, and why common-mode prone designs (like end-feds and JPoles) are so problematic.  Here’s an example of a 915 MHz antenna for a wideband comm system prototype I am designing. I decided on a wide-band vertical dipole.

In the pix below, we see the dipole front, and the dipole rear in it’s final form (sans heat shrink) – with a single loop binocular type 61 core performing the 1:1 current BalUn / choke function (they are the same thing):

Dipole_Front

Continue reading Why We Don’t Like Unintended Common-Mode Current Flow On Our Transmission Lines

235 total views, 2 views today

Please follow and like us: