Waveguide-coaxial converter based on single-ridge waveguide impedance transformation in Ka band

A waveguide-coaxial converter for Ka band is introduced. This converter uses the good wideband matching characteristics of the single-ridge waveguide and combines with a Chebyshev impedance converter to achieve impedance matching in the entire Ka band. HFSS full-wave simulation software was used for integrated design, RF simulation and structural optimization of the probe and impedance conversion. After processing and measurement, the converter has a back-to-back insertion loss of S21 ≤ 0.56 dB and a VSWR ≤ 1.24 in the frequency range of 26.5~40 GHz, the indicators are good.