Embedded Split Ring Resonator Tunable Notch Band Filter in Transmission Lines

Novel design techniques for tunable and fixed frequency notch band filters are presented and validated with experiments. A notch band filter based on an Embedded Split Ring Resonator (ESRR) in a Microstrip Transmission Line (MTL) is presented. The physical dimensions of the ESRR determine the filter resonance frequency, which, when combined with a Varactor (Varactor Loaded ESRRs or VLESRRs), provides a continuously tunable resonance frequency. Tunable notch bands centered from 1.5 GHz to 5 GHz are obtained with resonators having a length of 0.05
$\boldsymbol{\lambda_{0}}$
at the lowest frequency.