Tunable Filters

Details

Our mechanically tunable bandpass and bandstop filters come in many version. At frequencies below 6 GHz, they are typically coupled coaxial cavities with a mechanically movable tuning spindle. Above 6 GHz, most units are coupled cylindrical cavities operating in a waveguide mode. Tuning is accomplished with a movable plunger. Most units are gang-tuned, gear coupled to a common shaft. Filters can be provided with direct-reading tape readouts, micrometers or calibration charts. Some coaxial units are available which tune with constant passband width.   

Typical specifications are:

• Type: Bandpass: 4 pole, coaxial
• Tuning range: 4.4-5.0 GHz
• Passband width: 30 MHz nominal
• Passband loss: 2dB max at center frequency
• Readout type: Direct tape