CIRCULAR GROOVE SHAPED RESONATOR FOR MILLIMETER WAVES

In millimeter wave lengths region semiconductor generators, amplifiers , mixers and other solid state UHF devices find a wide application. Ln our work, we suggested to use a Circular Through-Shaped Resonator for obtaining power combination using active elements at frequency region Delta f approximate to 20-40 GHz. The resonator is formed by two plan e aluminum reflectors. The first reflector has a circular groove. The second reflector has coupling elements. The first and the second refle ctors are considered as a ring groove shaped waveguide. A resonator sp ectrum was calculated and analyzed in the frequency range Delta f appr oximate to 20-40 GHz. It is showed that, in the given frequency range the resonator spectrum has a complicated structure and is formed by a series of spectrum lines; a frequency range between the series increas es with the frequency increasing. We studied on transmission coefficie nt of the resonator, frequency shifts of spectrum lines when inserting a thin (t/lambda approximate to 0.003) dielectric substrates into the resonator, and also attenuation constants of waves propagating in cir cular groove (due to losses in metal). The calculating results are in agreement with experimental results. The obtained results may be used in creation of UHF devices in millimeter wavelengths region intended t o generation, amplification and processing of the investigated signals ; in dielectrometry etc.