RF and microwave filter

It is component that is used in electronic systems to pass or reject specific frequencies and attenuate of unwanted signals within the microwave and RF range.

Such filters are commonly used as building blocks for duplexers and diplexers to combine or separate multiple frequency bands.

The book by Matthaei, Young and Jones [2] provides a good reference to the design and realization of RF and microwave filters.

The simplest resonator structure that can be used in rf and microwave filters is an LC tank circuit consisting of parallel or series inductors and capacitors.

Planar transmission lines, such as microstrip, coplanar waveguide and stripline, can also make good resonators and filters.

Higher Q factors can be obtained by using low loss tangent dielectric materials for the substrate such as quartz or sapphire and lower resistance metals such as gold.

With low-loss dielectric materials, these can offer significantly higher performance than the other technologies previously discussed.