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Abstract

A suspended printed inductor (SPI) connected in parallel to a suspended interdigital capacitor (SIC) so as to form a parallel resonant circuit that is nearly independent of variations in PCB etching tolerances. This combination of SPI and SIC functions to resonate at a center frequency and with similar parallel resonant circuits can be used to form RF filters having any desired order. Using the parallel resonant combination of SPI and SIC, a RF filter can be constructed whose electrical properties are nearly insensitive to variations in PCB parameters and etch processing. The sensitivity of the spiral suspended printed inductor in combination with the suspended printed interdigital capacitor to PCB parameters such as dielectric constant and PCB height is greatly reduced. Further, the parallel combination of suspended printed spiral inductor and suspended interdigital capacitor is nearly insensitive to PCB etching tolerances. SPIs and SICs are characterized by the absence of a ground plane. Low cost RF filters can be formed over any suitable substrate material, such as a dielectric substrate, with greatly reduced effects on filter performance due to the variations in PCB height, trace width and PCB material.

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First Claim