FR4 Permittivity Issues

A project log for 1.420 GHz Antenna

With on-board LNA.

Robert RouquetteRobert Rouquette 07/02/2020 at 21:350 Comments

I assembled the board with components I had on hand to test the LNA and noticed some issues.  The LNA circuit itself works correctly and produces about 19dB of gain.  The antenna itself, however, does not appear to operate correctly.  I suspect this is a result of the difference between the OSH Park prototype boards and their "After Dark" process.  In an effort to preserve my sanity, I've ordered some simple characterization boards to compare the two processes.  The boards have three open-ended transmission lines to allow for measuring the permittivity at different frequencies.