The paper 'A 60-GHz CMOS Receiver Front-End' from Behzad Razavi, it said that he uses the metal to form the microstrip line.
As in the bellowing figure, I am confused that in the chip layout, the metal 8 and metal 1 are far away, while in his figure, the metal 1 and metal 8 are touched together like a microstrip line.
How does the layout in the chip can achieve this by making metal 1 and metal 8 are connected together? Anyone has ideas?
I assume they are using a typical layer of silicon used in CMOS processes for dielectric, but I have no idea what properties those have as it was omitted from the paper. A critical part.