High Frequency Inductor Modeling utilizing MLISoft®

Johanson Technology’s line of high frequency ceramic inductors is engineered for RF applications requiring performance, precision, and compact size. These inductors feature a spiral conductive element printed onto a ceramic core, delivering stable inductance values and excellent Q performance across frequency ranges.

Available Package Sizes and Inductance Values

• 0402 size: 1.0 nH to 100 nH
  
• 0603 size: 1.5 nH to 220 nH
  
• 0805 size: 1.5 nH to 680 nH
  

This product line supports a wide range of RF designs, including filters, matching networks, and impedance transformation circuits.

MLISoft® Simulation and Measurement Data

To assist RF design engineers, Johanson provides MLISoft®, a free inductor simulation tool that delivers key data in both graphical and numerical formats.

Features of MLISoft®

• View Q values at any frequency up to the inductor’s self-resonant frequency
  
• Access and download S-Parameters and SPICE models
  
• Plot frequency response curves for better RF circuit modeling
  

S-Parameter Measurement and Configuration

Johanson Technology performs precision measurement of inductor S-Parameters using the HP8720C Vector Network Analyzer. Data is captured using two test fixture configurations:

• Series configuration
  
• Shunt configuration
  

Both fixtures are designed by Intercontinental Microwave and utilize TRL calibration for accuracy. Users can download both series and shunt .s2p files directly from MLISoft®.

Visit www.icmicrowave.com to learn more about the test fixtures.

Q Factor Measurement and SPICE Model Accuracy

The Q factor is measured using an HP4291A Impedance Analyzer with the HP16192A test fixture in series mode. Shunt-mode Q is not reported due to fixture limitations.

How MLISoft® Derives Q

• SPICE models are created by fitting measured S-Parameters and Q data
  
• Q values shown in MLISoft® are derived directly from these calibrated SPICE model components
  

Optimize Your RF Design with Johanson Inductors

Engineers can rely on Johanson’s ceramic inductors and MLISoft® tool to:

• Select the optimal inductance value
  
• Simulate and verify circuit performance
  
• Reduce development time with downloadable data files