Application Examples

EMCoS > Application Examples > Three-pole Hairpin-line Microstrip Bandpass Filter

    • Three-pole Hairpin-line Microstrip Bandpass Filter

    Introduction

    This document demonstrates modeling of Printed Circuit Boards (PCB) with Green Function approach using new powerful tools of EMCoS PCB VLab and EMC Studio. In conjunction, these two products make it easy to build a full simulation chain for various types of PCB models. In this application note Three-pole Hairpin-line Microstrip Bandpass Filter modeling is considered. Simulated characteristics of structure are compared with reference measurement data.

    Simulation Workflow

    Microstrip Bandpass Filter Simulation Workflow

    Measurement Setup

    Measurement setup is represented by a three-pole hairpin-line microstrip bandpass filter on a 2 mm-thick substrate with relative dielectric constant 4.4. Parameters components of setup are listed in table below.

    Microstrip Bandpass Filter Measurement Setup Table

    Microstrip Bandpass Filter Measurement Setup

    Measurements were performed in EMCoS laboratory.

    Results

    The comparison of simulation and measurement results is shown below. There is good agreement between measurement and simulation results in considered frequency range.

    Microstrip Bandpass Filter S11 Magnitude

    Microstrip Bandpass Filter S21 Magnitude

    Microstrip Bandpass Filter S11 Phase

    Microstrip Bandpass Filter S21 Phase

    The current distribution on Microstrip Bandpass Filter for resonant frequencies is shown below.

    Microstrip Bandpass Filter Current Distribution (1.5 GHz)

    Microstrip Bandpass Filter Current Distribution (2.7 GHz)

    Conclusions

    According to performed investigation the main conclusions are:

    • Computational model of PCB can be effectively generated using EMCoS PCB VLab and EMC Studio
    • Simulation results are in good agreement with measurement results