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The resonant frequency of a series parallel L-C circuit is f=1/(2*PI*sqrt(L*C)). Some of your S11 dips are due to these poles. Others are due to the series L/shunt C pole. The poles will move around for many reasons.
Some Reasons Filter Response/S11 Dips Move Around
1. Variations in...
Below please find the link for building a microwave oven electric field detector using the RFD102A (RF-DC Converter) module from RF Diagnostics, LLC along with a surface mount LED and a dipole antenna made from the wires of a 1/4 leaded resistor. It's a fun gizmo to show the electric field...
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