The first demonstration of a high sidelobe suppression, tunable, electro-optic filter fabricated in lithium niobate for 1.55 mum is reported. Weighting of the mode convertor structure using a Taylor distribution resulted in a -3 dB pass-band width of 1.6 nm and nearest sidelobes of -25 dB. A continuous, linear electro-optic tuning rate of +/-30 V/nm is also reported.