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IP.com Disclosure Number: IPCOM000006471D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-07

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Stephen Einbinder Reginald Barnes


Recent developments in R-F chokes have seen a drastic reduction in the size of chip coils. Hybrids require smaller and smaller components and many of our designs are limited by the size of a chip inductor. One unfortu- nate limitation is that higher values of inductances are not available in the smaller physical sizes. The smaller inductor coils may be used as chokes at lower frequen- cies by taking advantage of the self resonance of a capac- itor placed in parallel with the inductor. This shifts the anti-resonant frequency downward. Unfortunately, sim- ply placing a chip capacitor in parallel does not yield any size advantage. (See Figure 1). There is a much more compact way to accomplish the same result.