This paper presents a novel electronic tuner with high power handling capability utilizing varactors based on the asymmetric bilateral coupled microstrip transmission line. Through varying the bias voltage of the varactor at the Ultra High Frequency (UHF) band, the performance of the tuner is demonstrated according to simulated and measured results from several cases with the return loss (S11 ) below -20 dB and the insertion loss (S21 ) within ±0.5 dB. Compared with tuners using p and t network, electronic tuner of this paper shows superior frequency agility as well as wide impendence coverage. Advanced biasing structure has been developed to improve power handling for high power level applications. It is expected that the novel tuner would be part of intelligent Radio Frequency (RF) front-ends system and cognitive wireless system in the future. This paper presents a novel electronic tuner with high power handling capability utilizing varactors based on the varactor at the Ultra High Frequency (UHF) band, the performance of the tuner is demonstrated according To compare with tuners using p and t network, electronic tuner of this paper shows superior frequency agility as It is expected that the novel tuner would be part of an intelligent radio frequency (RF) front-ends system and cognitive wireless system in the future. .