How to add capacitance in between two points end points of spiral coil?

[Jeetkumar]

Hi All,

I am at present working on coil design for RFID tag, i want to know how you add capacitance in spiral coil i.e. how you join two ends in spiral structure with capacitance in between, i have already calculated capacitance value needed to resonant at particular frequency.

Any help is appreciated.

Thanks

 

[jsgruszynski]

Well every pair of points on such an inductor already has capacitance and when you add more you induces more parasites. Generally you are going to have to get out the calculus and/or FEA simulation software like Ansys to figure it out OR empirically add capacitance and measuring it with instruments. It's an distributed impedance problem