RESEARCH OF A QUASIOPTICAL OPEN RESONATOR FOR POWER SUMMATION IN A HIGHLY STABLE GENERATOR OF THE TERAHERTZ RANGE

The efficiency of excitation of the axial-asymmetric vibration TEM10q in a quasioptical open resonator of the power combiner (ORSM) by means of the TE20 waveguide wave is investigated. Based on the theory of mirror antennas, the efficiency of excitation of TEM10q oscillations in a hemispherical resonator using a rectangular waveguide with a cross-section in which the TE20 wave propagates is estimated. Based on the calculations, it was concluded that about 87% of the power supplied to the resonator via the waveguide is used to excite the oscillation under consideration. Therefore, such a resonant system should have good selective properties. Additional studies were conducted to confirm this. It was established that with coordinated excitation of oscillations in the VRSP, the latter has angular and frequency spectrum selection. With the correct selection of the transverse dimensions of a rectangular waveguide with a TE20 wave, located in the center of a VRSP flat mirror, the latter will have a single-frequency response in a wide frequency band and a high power stacking factor in the terahertz range can be provided. When placing the sources in each of the two rectangular waveguides that pass into the emitters of the above dimensions, we will get a power adder based on a hemispherical VRSP. An electrodynamic system of two rectangular waveguides of certain cross-sectional dimensions is proposed and investigated, which allows adjusting the amount of coupling between the sources and the resonator. For this purpose, an E-polarized wire diffraction grating is located on the VRSP flat mirror, changing the period of which regulates the connection of the resonator with the sources. It was found that by choosing the parameters of one-dimensional diffraction gratings (E-polarization) in the openings of the communication elements, it is possible to ensure any predetermined connection of individual sources with a resonant volume. Experimental studies of VRSP at a frequency of 130 GHz were carried out. The measured power at its output was within (10...13 dBm), which corresponds to the efficiency of power assembly k=0.76. The results of the conducted research allow us to draw a conclusion about the prospects of using the developed VRSP in highly stable generators of the terahertz range.