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11-53-01, 225-400 MHz, Bandpass Cavity Filter passes 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.



Product Specifications 
Item No11-53-01
Item Name225-400 MHz, Bandpass Cavity Filter
Frequency Range225-400
Max Power per Cavity100 W, per cavity @ 0.5 dB IL
100 W, per cavity @ 3.0 dB IL
Impedance Ω50
VSWR - Return Loss1.25:1 (15 dB)
VSWR1.25:1 max.
Cavity Length - Electrical3/4λ
Temperature Range-30 to +60 °C
Cavity Diameter8" (203 mm)
Number of Cavities1
Dimensions H x W x D
25" x 8" x 8"
(635.0 x 203.2 x 203.2mm)
Shipping Weight8.6 lbs.


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Cavity Filter Loop Kits