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# LC Lowpass Tee

Model LC lowpass tee network

## Library

Ladders Filters sublibrary of the Physical library

## Description

The LC Lowpass Tee block models the LC lowpass tee network described in the block dialog box in terms of its frequency-dependent S-parameters.

For each inductor and capacitor in the network, the block first calculates the ABCD-parameters at each frequency contained in the vector of modeling frequencies. For each series circuit, A = 1, B = Z, C = 0, and D = 1, where Z is the impedance of the series circuit. For each shunt, A = 1, B = 0, C = Y, and D = 1, where Y is the admittance of the shunt circuit.

The LC Lowpass Tee block then cascades the ABCD-parameters for each circuit element at each of the modeling frequencies, and converts the cascaded parameters to S-parameters using the RF Toolbox™ abcd2s function.

See the Output Port block reference page for information about determining the modeling frequencies.

The LC lowpass tee network object is a two-port network as shown in the following circuit diagram.

[L1, L2, L3, ...] is the value of the 'L' property, and [C1, C2, C3, ...] is the value of the 'C' property.

## Dialog Box

### Main Tab

Inductance (H)

Vector containing the inductances, in order from source to load, of all inductors in the network. The inductance vector must contain at least two elements. All values must be strictly positive.

Capacitance (F)

Vector containing the capacitances, in order from source to load, of all capacitors in the network. Its length must be equal to or one less than the length of the vector you provide in the Inductance parameter. All values must be strictly positive.

### Visualization Tab

For information about plotting, see Create Plots.

## Examples

See the LC Bandpass Pi block for an example of an LC filter.

## References

[1] Ludwig, Reinhold and Pavel Bretchko, RF Circuit Design: Theory and Applications, Prentice-Hall, 2000.

[2] Zverev, Anatol I., Handbook of Filter Synthesis, John Wiley & Sons, 1967.

## See Also

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