The L match circuit is so named because the circuit topology can resemble the letter “L”. This tool helps you create a matching circuit so that optimal power transfer occurs between unmatched loads. This technique doesn’t work for wideband requirements, but it is a simple way to achieve this at a specific frequency. This calculator will give you the circuit topology as well as the component values.
Inputs
Frequency
F
Source Resistance
RS
ohm
Source Reactance
XS
ohm
Load Resistance
RL
ohm
Load Reactance
XL
ohm
Q Factor
Q
ohm
Circuit DC Current
Outputs
L:
C:
Q:
plots:
Mag & Phase
Real & Complex
Freq:
Mag:
Phase:
L Match Impedance Calculator
The L match circuit gets its name because the circuit topology can look like the letter “L”. This tool will
help you create a matching circuit so that optimal power transfer occurs between unmatched loads. This
technique doesn’t work for wide band requirements, but is a simple way to achieve this at a specific
frequency. This calculator will give you the circuit topology as well as the component values.
L Match Impedance Calculator
There are some important items to understand when using this tool. The circuit topology can change depending
on the inputs. In all topologies there is one inductor and one capacitor, but the location of these
components changes. There is one menu item to select if there is to be any DC current or not, that also
affects the topology. The inputs ask for source resistance and source reactance. If you are unsure what the
reactance is set it to zero for a first pass approximation.
The outputs of this tool give you the component values as well as a graph of the impedance looking into the
L circuit from the source. This allows you to double check the calculator and make sure that it selected
appropriate values, by making sure the impedance correctly matches the input impedance. Also remember that
the circuit input reactance will be opposite in polarity with the source reactance when matching.
