There has been a phenomenal growth in the wirThe microwave filter is a component which provides frequency selectivity in mobileand satellite communications, radar, electronics warfare, and remote sensing systems operating at microwave frequencies. In general, the electrical performances of the filter aredescribed in terms of insertion loss, return loss, frequency-selectivity (or attenuation at rejection band), group-delay variation in the passband, and so on. Filters are required to havesmall insertion loss, large return loss for good impedance matching with interconnecting components, and high frequency-selectivity to prevent interference. If the filter has highfrequency-selectivity, the guard band between each channel can be determined to be smallwhich indicates that the frequency can be used efficiently. Also, small group-delay and amplitude variation of the filter in the passband are required for minimum signal degradation.In mechanical performance aspect, filters are required to have small volume and mass, andgood temperature stability.eless industry.
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