Hybrid microwave circuit mfr. using serigraphic layers - uses laser to machine notches from layers of conducting ink obtained by serigraphic process

摘要

The circuit has a conductive band (1) applied across the surface of a substrate (3) by serigraphic printing using a conductive ink. The applied band is notched to provide a capacitive effect, with the notches (2) formed by laser machining. Pref. the conductive band (1) is applied to an Al substrate (3) by an atomic printing machine before firing at a temp. of about 850 deg.C. for 30 minutes. The machining of the notches (2) is effected by an automatic laser appts. using a YAG laser with a mean power of between 1 and 3 watts and a frequency of 1 to 5 Kg giving a spot with about 50 microns. The machining process can be also used to separate an applied conductive band into halves, or for selective material removal from an applied band for impedance adjustment. The mfg. process can be fully automated.