210-320 GHz multi-hole directional coupler design and measurement

摘要

The design of a 210-320 GHz multi-hole directional coupler is described. The coupler performance is measured with a millimeter vector network analyser across the band 205-350 HGz and compared with simulations. The coupler consists of two waveguides whose broad walls are separated by a thin metal sheet with an array of circular holes according to a Chebyshev distribution of couplings. The coupling is 11 dB with a typical variation of ±2dB across the WR3 band and the isolation is more than 25 dB.