Abstract
This paper reports on development of effective cascade type microwave interference switches using waveguide H-tees providing total transition attenuation value of about -50dB at the non-transmitting state, the power losses of -2-3dB at the transmitting state, and the working power compared to the one of a regular waveguide. These switches have different types of connections of two or three H-tees. Different designs provide different distributions of switched wave power between tees and provide different power levels of the switched wave. Characteristics of the switches made of tees matched from their side arms and of unmatched ones were calculated using the scattering matrix method. It was shown the matched tees used in the design allow decreasing by several times the power level of the switched wave and that increases the operating power and stability of the switching process. While some definite combination of unmatched tees allow increasing the power level of the switched wave and may provide effective switching of the transmitted wave at decreased power level. It was shown experimentally the cascade switches could be used as effective energy extraction device in an active resonant microwave compressor also.
Highlights
Generation and use of the electromagnetic energy of ultrahigh frequency are always accompanied by processes of controlling the fluxes of the microwave energy
Resonant microwave compressors operate on the basis of storing the microwave energy in a cavity and following fast extraction into a load
Most compressors use an interference microwave switch for switching the cavity over to the energy extraction mode. This switch is simple and effective; it is designed as a waveguide H-tee, where one direct arm is connected to the cavity and the other direct arm or the side arm is short-circuited and contains the microwave switch
Summary
Generation and use of the electromagnetic energy of ultrahigh frequency are always accompanied by processes of controlling the fluxes of the microwave energy. The work of devices controlling the fluxes affects the quality and efficiency of a source of microwave radiation. This is especially true for resonant microwave compressors being sources of pulse microwave radiation [1,2]. Most compressors use an interference microwave switch for switching the cavity over to the energy extraction mode. This switch is simple and effective; it is designed as a waveguide H-tee, where one direct arm is connected to the cavity and the other direct arm or the side arm is short-circuited and contains the microwave switch.
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