The analysis and simulation of a six-port receiver for 24 GHz QPSK signal usign WIPL-D Microwave design environment has been demonstrated. The set of simulation tools available within the program allows not only for the accurate and reliable design of the individual components comprising a receiver system, but for detailed analysis of the system itself. Example of studying an impact of imperfections of branch-line hybrids to receiver performance has been presented.
Additional simulations of the receiver system are possible. The simulations should address impact of phase imbalance larger then considered 1° to receiver performance. Voltages at ports 1 and 2, both been set to 1 V for the demonstration, can be set to more realistic values. Measured voltages can be multiplied by a coefficient to take into account real conversion characteristic of the detector. Knowing sensitivity threshold of DSPU, minimum received signal level can then be determined. Simulation blocks of branch line and Wilkinson combiner circuits can be replaced with the blocks of S parameters measured on fabricated samples to explore signal constellations with real-world circuits. All these simulations can be carried out using WIPL-D Microwave.