Power combining by axially symmetrical Fabry-Perot resonator with multiple device inserted in a dielectric

摘要

An axially symmetrical Fabry-Perot resonator with active devices inserted in a dielectric has been investigated for power combining of many more devices in microwave and millimeter wave frequency range. By previous experiments, it was shown that the output power of the individual devices can be combined efficiently when the spacing between the adjacent devices is nearly equal to half wavelength at the operating frequency. The active devices are inserted in the dielectric, in which the wavelength is shorter than that in free space, in order to increase the number of the devices. The device mount was designed by numerical calculation using the boundary element method. In the experiments at X-band, the fabricated combiners with Gunn diodes oscillated stably, and almost perfect power combining was achieved in both the cases of the sixteen diodes and the twenty-two diodes.