Isofilters are evanescent bandpass filters with isolators on input or output. Through this means, the filter presents a low VSWR even in the stopband region. We employ a technique whereby the filter is “plugged” into an isolator, thus avoiding the parasitic length between the two components.
A representative unit has the following characteristics:
- Passband: 15-17 GHz
- Number of poles: 9
- Maximum insertions loss: 2 dB including filter and input isolator
- Maximum Input VSWR: 1.2 from 12 to 18 GHz