Microwave Circuits

Microstrip Bandpass Filters

This application note presents
S-parameters, number of unknowns, computer memory requirements, and simulation time per frequency obtained from simulations of two passive microstrip band-pass filters using WIPL-D Fitter. The first filter is interdigital, and the second uses coupled resonators. Simulations were carried out in WIPL-D Pro, a full-wave 3D EM Method-of-Moments solver. The interdigital filter was simulated from 1900–2600 MHz, and the coupled resonator filter from 2000–2700 MHz, each at nine frequency points. The S11 curves are very smooth due to WIPL-D Fitter’s efficient frequency interpolation. Both simulations required low number of unknowns and can be executed on any standard desktop or laptop, with times measured in seconds.

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Six-Port as Wireless Communication Receiver

In this application note, simulation of a six-port receiver for 24 GHz QPSK signals is demonstrated using WIPL-D Microwave Pro, a complete design environment enabling accurate component and system-level analysis. This example clearly shows the impact of branch-line hybrid imperfections on receiver performance. Additional studies can address phase imbalance beyond 1°, realistic port voltages, and detector conversion characteristics. Measured S-parameters of fabricated blocks can replace simulated components to explore real-world signal constellations. WIPL-D Microwave ensures fast, reliable, and flexible simulation of complex microwave receiver systems, combining precision, efficiency, and versatility for advanced RF design and analysis.

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