Harmonic suppression device

A harmonic suppression device comprising a multilayer printed circuit board (PCB), wherein the multilayer PCB comprises:

• a first layer configured with a power amplifier, an input microstrip, a voltage divider microstrip, and an output microstrip, wherein the power amplifier is operable to amplify radio frequency (RF) signals input using the input microstrip and to output the amplified RF signals using the output microstrip, and the voltage divider microstrip is operable to transmit an external voltage to the power amplifier;
• a second layer configured with a first microstrip and a second microstrip, the first microstrip and the second microstrip operable to improve linearity of the power amplifier;
• and
• a third layer connected to ground;
• wherein one end of each of the first and second microstrips is connected to an alternative one of the first layer and the third layer by vias, and the other ends of the first and second microstrips are unattached to suppress harmonics on the power amplifier.