И еще, расчет был для 3.38, хотя в
http://www.rogerscorp.com/documents/726/acm/RO4000-Laminates---Data-sheet.aspx говорят, что (3) Dielectric Constant, εr (Recommended for use in circuit design) - 3.55
(3) The design Dk is an average number from several different tested lots of material and on the most common thickness/s. If more detailed information is
required please contact Rogers Corporation. Refer to Rogers’ technical paper “Dielectric Properties of High Frequency Materials” available at http://www.rogerscorp.com/acm
Эта же топология, но при 3.55, смещается вниз на 200МГц и краем еще цепляет 5760, но IL уже около -3.4db.