LC-Notch-Filters Less Sensitive to LTCC Process Tolerances

A new design procedure for low temperature cofired ceramics integrated single inductance–capacitance (LC)-notch filters is described that minimizes the shift in resonance frequency due to process variations such as layer thickness and line-width variations. 25-
$mu$
m thin layers of dielectric constant 7.8 and 17.9 were used for the experimental verification and further miniaturization of the layout. A two to five-fold reduction of the resonance frequency uncertainty was achieved compared to conventional designs. Application of these new single LC-notch filters in Bluetooth radio frequency-front-end modules is discussed.