A high power RF amplifier design using an RFMD IC RF6886
They use multiple capacitors in parallel to get the desired total capacitance. You simply can't buy a 620 pF capacitor, but you can build one by using two 220 and one 180 pF cap in parallel.

Just add up the parallel capacitances and mentally treat them as one.

Then you're left with a classical LC low-pass. If you're building a power amplifier, you should definitely be sufficiently accustomed to these – otherwise, you will break the law by transmitting at frequencies you're not allowed to use, and that comes with something between expensive fines, shutdown of your lab, or even criminal charges (depending on what you interfered with, your jurisdiction and whether you should have known better (yes, you should)).