500MHz Lumped Element Low Pass Filter Design

In this article, we’ll explore the design of a 500MHz lumped element Low Pass Filter (LPF) using inductors and capacitors. We’ll also look at a simulation circuit for this design.

Lumped Element LPF circuit

The figure above illustrates the 500MHz Low Pass Filter (LPF) circuit, built using L and C lumped elements. After establishing initial values for the components, these values were optimized based on a predefined set of optimization goals.

Lumped element LPF results

The figure above shows the results of our 500MHz Low Pass Filter (LPF) simulation. As you can see, the insertion loss (S21) is approximately 0 dB up to around 500MHz. Beyond this frequency, the insertion loss increases significantly.

The return loss values (S11 and S22) are better than -16dB, as specified in the optimization goal.

Conclusion

As demonstrated in this article, other RF filters utilizing lumped elements can be designed, simulated, and verified using RF design software tools.