11-87 Series

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11-87 Series


11-87 Series, 851-866 MHz, Bandpass Cavity Filters pass one narrow band of frequencies and attenuates all others with increasing attenuation above and below the pass frequency. It is equivalent to a parallel-tuned circuit and is most often used for general transmitter spurious clean-up or a sharpening of a single receiver front end selectivity with or without amplification. TX RX bandpass cavities (4", 6" and 10") have adjustable selectivity characteristics (rotatable loops) to allow a trade-off between insertion loss (0.5-3.0 dB) and selectivity. Maximum power handling is typically determined by insertion loss setting.

  • Various Low-Loss High-Rejection Models to choose from.
  • All Loop Plate/connector assemblies are silver-or Alballoy®-plated for low IM.
  • Welded cavity construction and silver-plated tunable probe and loops give superior pass and reject characteristics.


11-87 Series, Cavity Filters

Model NumberNumber of CavitiesShipping Weight, lbs.



Product Specifications 
Item No11-87 Series
Item Name851-866 MHz, Bandpass Cavity Filters
Frequency Range851-866 MHz
Max Power per Cavity270 W, per cavity @ 0.5 dB IL
60W, per cavity @ 3.0 dB IL
Impedance Ω50
VSWR1.25:1 max.
Cavity Length - Electrical3/4λ
Temperature Range-30 to +60 °C
Cavity Diameter6.625"
Number of Cavities1 or 2
Dimensions H x W x D
13" x 6.625" x 6.625"
(330.2 x 168.3 x 168.3 mm)


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Cavity Filter Loop Kits