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Band reject filter

The presence of an unwanted interfering signal superimposed on an audio signal of varying frequency is a major problem in the reception of single sideband transmissions, where a constant frequency interference is the result of a continuous wave transmission on a nearby frequency. To reduce or eliminate the effects of these unwanted signals, various filters are developed for blocking jamming signals. Band reject filters are used to provide frequency selectivity, that is, to pass certain frequencies and reject others by means of a group of reactive circuit elements. Band reject filters may be designed using various techniques that employ, for example, lumped elements with discrete coils and capacitors, stripline, coaxial resonators or waveguide resonators. A waveguide band reject filter consists of a section of waveguide having a direct path from input to output. Individual waveguide resonant cavities are then mounted on the waveguide section and connected to it through iris openings in the waveguide section.

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