- Air coils http://www.airdux.com/coil-design.html
- Doherty and Load Pull Testing http://staff.ee.sun.ac.za/cvanniekerk/amplifiers.htm
- TRL Test Fixtures https://www.google.com/search?q=TRL+test+fixture&espv=2&biw=1264&bih=1403&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMI367N-o7fyAIVgzmICh1hbQtt&dpr=1
- WTF Are Trapping Effects http://www.silvaco.com/content/kbase/Trapping_Effects_InThe_Transient_Response.pdf
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