Impedance matching vs LC filter
You have shown a high pass LC circuit (an L-pad). That L-pad will have an input resistance that is purely resistive at one particular frequency. That input resistance will be lower than the output resistance of the load. Here's an example and a calculator you can use for determining the matching components: -

Picture and calculator can be found here. On that page you will find full derivations for the formulas.
In simple terms, the C and L form a high pass filter that have a natural resonant frequency but, when loaded with a particular value of resistance, the input impedance is purely resistive at a frequency a little bit higher than the natural resonant frequency.
In the example above you can see that the natural resonant frequency is 9.1287 MHz but, at 10 MHz (an enterable quantity) the impedance is a pure match. It is also loss-less i.e. power entering the capacitor is transferred without loss to the load.
And, if you look a little more on pages around the link I gave you'll see how two of these L-pads can form a pi-filter impedance matching network. There are several examples given.