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Microlab’s low pass filters are designed to suppress harmonics and out of band
noise and interference, to improve signal quality in high power system
applications and bench testing. The design used is known as rod and bead and is
constructed of alternate lengths of high and low impedance transmission lines
tuned to provide the proper frequency response. The design ensures a low loss
pass band response down to at least 40% of the cut-off frequency. In the stop
band rejection of at least 55 dB occurs at 150% of cut-off and extends typically
for several octaves. When compared to lumped element construction, the single
piece rod and bead filter has far fewer solder joints, is better supported, and
operates cooler with a better VSWR.