Quarterwave Coaxial Bandpass Filters

Angle Linear produces filters to complement it's line of low noise preamplifiers. If you have interference on your frequency what good is to have great sensitivity? Regardless of the type of system you use you must have adequate filtering. to survive. Today's hostile RF environment makes the use of band pass filters an absolute necessity and it doesn't really make any difference where you are located anymore. It doesn't do you any good the have a super preamplifier for great sensitivity if it is always is getting overloaded or has interference from adjacent frequency signals.

Band pass filters can be made to give minimum insertion loss to the desired frequency and maximum attenuation to the undesired signals and allow your system to operate without any interference.

We produce single and multiple resonator (coaxial cavity) filters from 109 MHz up to 1300 MHz. We can also manufacture custom filters to your requirements. Copper is used throughout our filters to give maximum mechanical , thermal stability and the lowest insertion loss.

Shown below, dual bandpass 455 MHz filter. We provide single, dual and triple assemblies for virtually any application where low insertion loss and narrow bandwidth is required.

also see our "turn-key" front end filter preamplifier assemblies

Network analyzer insertion loss and swept response plots:

UHF filter plots

• 455 MHz +/- 10 MHz comparison of single, dual and triple assemblies. larger file 128k
• Single resonator 455 MHz response plots : 455 MHz +/- 10 MHz., 400 to 500 MHz & 1 MHz to 3 GHz
• Dual resonator 455 MHz response plots: 455 MHz +/- 10 MHz., 400 to 500 MHz & 1 MHz to 3 GHz
• Triple resonator 455 MHz response plots: 455 MHz +/- 10 MHz., 400 to 500 MHz & 1 MHz to 3 GHz
• Notch filters can be combined with band pass filters for master receive front ends: triple BPF plus one notch.

VHF filter plots:

• dual 153 MHz response: 153 MHz +/- 5 MHz

Bandpass filter-panel shipping and re-assembly information