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FM Bandpass Filters
2P, 3P Series

Rev : 01 | Rev date : 21 Feb 2017
RFS bandpass filters are primarily used as part of multi-channel combiner facilities but can also be used to eliminate spurious emissions and increase isolation between co-sited services.
The filters are designed with all bolted connections and any sliding contacts are at low current density points to ensure maximum reliability and ideal power ratings for a given physical size.
Each filter comprises several 2 or 3 coaxial resonators which are aperture coupled. The fixed aperture coupling design is engineered for a constant passband wherever the pass band is tuned in the 87.5 - 108MHz band. This design ensures standard insertion loss and rejection for each filter model, although custom filter performance (modified aperture coupling) is available on request.


  • Natural convection cooling for all power levels
  • Fixed aperture coupling for high reliability and easy re-tuning
  • Vertical entry and exit
  • Invar temperature compensation
  • 2 and 3 pole versions standard

Typical FM bandpass filters

Technical features

General Specifications

Product LineFilters
Product TypeBand II (VHF) FM Bandpass Filter
Filter Type and Size3 Pole

Electrical Specifications

Frequency Range MHz87.5 - 108
Input PowerkW2
Insertion Loss dB0.5
Return Loss dB> 26 to ± 200kHz
Group Delayns< 25 to ± 100kHz
Amplitude Variation dB< 0.2 to ± 200kHz
Filter Rejection dB20 at 0.8MHz
38 at 1.6MHz
Impedance Ω50

Mechanical Specifications

Weightkg (lb)45 (99)
Dimensions (Height)cm (in)140.0 (55-1/8)

External Document Links


  • Note 1 Alternative connectors available on request.