This paper is an overview of important concepts and formulas involved in the application of coupling coefficients of microwave resonators for the design of bandpass filters with a particular emphasis on the frequency dispersion of coupling coefficients. The presumptions and formulas are classified into accurate, approximate, and erroneous ones.

A novel symmetrical split ring resonator (SSRR) based microwave sensor with spurline filters for detecting and characterizing the properties of solid materials has been developed. Due to the weak perturbation in the interaction of material under test (MUT) and planar microwave sensor, spurline filters were embedded to the SSRR microwave sensor which effectively enhanced Q-factor with suppressin...

Application Note

A combination of lowpass and dual band bandpass filter with improved selectivity is presented in this manuscript. Two circular split ring resonators which are connected at the upper side, provide a characteristics. In order to achieve combined passband response two L-shape stubs incorporated into structure. The parametric analysis proposed has been carried out using CST microwave studio. numeri...

A flip-chip-type MMIC architecture is used to build a wideband filter with ultrathin iron (Fe) films grown on compound semiconductor substrate (GaAs). Microwave and millimeter-wave components incorporating these ferromagnetic films possess the unique capability of having a resonance frequency that can be easily tuned by an externally applied magnetic bias. A bandstop notch filter is realized us...