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Tunable Filters
MINI-POLE T01 transparent
Bandpass Filters 
Pole/Zero's bandpass filters are typically 2-pole, constant Q designs and aligned to provide a close approximation to a Butterworth response. Filter tuning ranges are available based on popular communication bands covering 1.5MHz to 3GHz. Units are available with standard 3dB bandwidths from 1.8 to 20%.  

The Extended Range series was developed to address application needing a small package with wide tunability.  Tuning ranges can cover multiple octaves.
   
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Notch Filters 
Pole/Zero's MINI-POLE®, MAXI-POLE®, and POWER-POLE® notch filters are 2-pole Butterworth, high Q, narrowband RF filters whose center frequency is controlled digitally. Filter tuning ranges are available based on popular communication bands covering 1.5MHz to 1GHz. 
   
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Preselectors 
Pole/Zero's preselectors can easily be integrated with most transceivers and will protect communication equipment from high interference levels. These agile filters will operate from 20 MHz up to 2 GHz.