Nowadays, solid-state radio transmitters(SSRT) are as common as tube transmitters. SSRTs are even superior to tube transmitters in some applications because of special specifications like lower noise, lower DC voltage supply and easier maintenance and repairing requirements. One of the significant parts of radio transmitters is RF power amplifier. There are several parameters in RF power amplifiers which depending on the application, contribute more to the amplifier performance. One of these parameters is amplifier bandwidth. Providing wider bandwidth in solid-state transmitters is very important since it improves the received data resolution. Two important applications of VHF wideband radars are search radars and synthetic aperture radars employed to recognize unknown targets. The purpose of this work is to design a power amplifier with at least 200Watts output power over frequency range from 100MHz to 300MHz. After a comprehensive literature review on different dir=ltr To determine the circuit performance of the amplifier design, “Harmonic-Balance” simulation with nonlinear model of the transistor is incorporated. Harmonic Balance simulation provides the possibility of verifying bias circuit effect on matching network and amplifier output power. Such analysis makes the simulation results more reliable. At last the amplifier is verified for large signal and small signal stability to ensure that no spurious oscillation is accrued in the amplifier.
