WR8 Mlengkung Waveguide E Bend 90-140GHz 25.4mm WR8 waveguide sudhut mlengkung E bend 90-140GHz 25.4mm WR10 Extending waveguide bend 1,67 inch WR12 waveguide mlengkung H bend 60-90 GHz 25.4mm WR10 Extending waveguide bend 1,24 inch