Broadband axial excitation of Fabry-Perot resonator

The paper presents the broadband axial excitation of the Fabry-Perot resonator as well as its comparison with the standard radial excitation (via a dielectric foil) and two types of axial excitations (electric and inductive coupling) are discussed. The resonator was designed for the frequency range from 18 to at least 80 GHz. For the broadband measurement of the emission spectra, the excitation for the frequency range 18–26.5 GHz was proposed. Moreover, the excitations performance was measured and evaluated for the frequencies up to 40 GHz.