LEMatch (Lumped Component Match)

Symbol

Parameters

Name	Description	Unit	Default
F	Center frequency	GHz	1
Zin	Desired complex input impedance	Ohm	50
Zload	Complex load impedance to match	Ohm	100
NetworkType	Type of network (source to load)	None	Allow Selection

Notes

1. A lumped component matching network uses reactive components to match a complex load impedance (Zload) to a desired complex input impedance (Zin).
2. The network type specifies the type of reactive components used (L represents inductance, C represents capacitance) as well as their orientation (series or shunt). The first component specified is that nearest the source, while the second is that nearest the load. If the chosen network type cannot realize the impedance match specified, or if the network type is chosen as "Allow Selection", a dialog box will appear allowing selection from the possible network types that can perform the match.
3. Either two or four distinct networks are possible depending on the load and input impedance specified.
4. The input port termination is set to the conjugate of Zin so that the ideal input reflection coefficient will be zero. The output port termination is set to Zload.
5. No optimization assistant is provided since the design procedure is exact for ideal lumped component models.
6. A SmartComponent subnetwork is empty until the Design Assistant is used to generate the design. Refer to Design Assistant.

For a more detailed discussion of this device, see: D. M. Pozar, Microwave Engineering, 2nd Edition, John Wiley & Sons: New York, 1998, pp. 252-258.

Example

A lumped component matching network was designed to match a load impedance of 100 - j30 Ohms to an input impedance of 50 Ohms at a center frequency of 1 GHz. A Series L Shunt C configuration was used to realize this match.