Could some electronics guru please help ? Recently, I came upon some literature related to micro strip inter-digitated capacitors fabricated on single side copper clad FR4. Several questions arose in my mind.
- Is this an air core capacitor with the fingers acting as the plates of a parallel plate capacitor ? Ib this case, for each capacitor's capacitance would be very low, given the very small thickness of the fingers ?
- What is the main issue for not using a double sided copper clad piece, and use the parallel plate capacitor ides ? Making a capacitor like this would be so much easier, for example precisely cutting out a square piece of predetermined length? In addition, the relative permittivity of the core material would increase the capacitance.
What are the opinions of the gurus ? Thanks in advance.