Band-Pass Filters in Integrating Waveguide Technology and Adapters to Standard Waveguides

Standard waveguide circuits do not lend themselves to integration as do circuits made according to the INWATE process. In this paper 10 GHz and 30 GHz INWATE band-pass filters which do not require tuning are described with regard to their manufacture and measurement results. At relative bandwidths of about 0.07 pass-band insertion loss is less than 0.6 dB and 0.8 dB. Temperature variations between -30°C and +60°C do not cause observable changes in the insertion loss characteristic. The 10 GHz filters include adapters to standard waveveguides which have been designed experimentally and separately. An adapter design chart for return loss > 17 dB is presented.