Link Microtek Ltd's AMQ-LP1 series of waveguide low-pass filters provides a rejection of better than 100dB, falling to 70dB at band edges. The filter series comprises five standard parts, using waveguide sizes of WR340, WR137, WR112, WR90 and WR75 to deliver cut-off frequencies of 2.75GHz, 8.15GHz, 9GHz, 10.4GHz and 13.5GHz respectively.
The devices are suitable for use as transmit reject filters, and they achieve a Chebyshev ripple response with sharp cutoff, a maximum insertion loss of 0.6dB, and a minimum return loss of typically 20dB. Fabricated from solid aluminum using CNC machines, these reflective filters feature a corrugated internal design and are supplied with a satin black painted finish as standard.