Development and research of incoming signal switch for transceiver communication systems

The analysis of the types of incoming signal switches was performed. The choice of constructive realization of the switch was made. It was offered the method of its designing and simulation. NI AWR Design Environment software was used to implement the method. The model of microwave filter based on microstrip elements was constructed. The scattering and standing wave factors were compared in the voltage of the obtained model and the filter topology. It was determined that the switch provides working capacity both with continuous and impulse radio signals with any kind of modulation. It has a transmission coefficient of radio signals in the operating frequency range in the open state of the inputs without attenuation from 0 to +10 dB, at maximum attenuation – from –28 to –4 dB, and in the closed state of the inputs with the maximum attenuation – from –80 to –100 dB. The level of isolation between the inputs is not less than –50…–55 dB. The transmission coefficient of radio signals from the inputs to the output is regulated in increments of 0,5 dB, with depth of at least minus 15 dB, with the transition tuning less than 100 ns. Switch of coming signals provides a linear operation with the noise level and spurious component at the outputs no more than –90 dB/W and the signal/noise ratio of at least 10 dB in linear mode of operation. The irregularity of the transmission coefficients of radio signals on each of the outputs in the operating frequency range when the inputs are open without attenuation and the linear mode of operation is not more than ±1,0 dB. The second and third order intermodulation distortion coefficient does not exceed –60 dBs when two nanoseconds of radio signals are applied to the inputs.