Millimetre‐wave broadband waveguide‐based power combiner using lossy planar lines

A lossy waveguide‐based power combiner is proposed for broadband low‐loss symmetrically combining with good port matching and isolation at millimetre‐wave frequencies. In the combiner, lossy planar transmission lines are used to provide attenuation to even‐mode excitations and to achieve broadband low‐loss power combining with good port matching and isolation. The experimental results show that the lossy waveguide‐based power combiner has a loss of about 0.14 dB and a reflection coefficient and isolation of about –15 dB in 26.5–40 GHz, respectively. The lossy waveguide‐based power combiner can be used in a multi‐way power amplifying–combining system to obtain millimetre‐wave broadband high solid‐state power with high efficiency and good stability.