A surge protection circuit may include a tuned circuit board with traces designed to provide a surge protected and RF isolated DC path while propagating RF signals through the PCB dielectric with microstrip lines. The surge protection circuit utilizes high impedance RF decoupling devices such as quarterwave...http://www.google.com/patents/US8179656?utm_source=gb-gplus-sharePatent US8179656 - Surge protection circuit for passing DC and RF signals
