Abstract: This paper presents the design of an ultra-broadband T-type analog linearizer with detailed analysis and simulation. The proposed structure, which is mainly composed of tee-attenuator and PIN diode, can achieve the amplitude expansion and phase compression. Featuring a simple bias circuit and good return loss of both two ports, the designed linearizer operates in the 0.8 GHz to 2 GHz frequency range. The test results confirm that 5 dB amplitude expansion and 18°phase compression can be achieved respectively in this way.