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For the past decade, researchers have been working hard to replace traditional non-destructive testing procedures with structural health monitoring techniques based on smart materials. Piezoelectric materials proved to be effective smart materials because of the cost-effectiveness of structural health monitoring (SHM). Electro Mechanical Impedance (EMI), the sensitivity of the piezo-impedance (Lead Zirconate Titanate, PZT) transducer technology in detecting local damage is well recognized. Many factors affect the effectiveness of damage detection using the EMI technique, including selection of frequency range. In the present project numerical studies are conducted on smart cantilever beam with on steel with and without induced damage for various frequency ranges. Based on the changes in conductance signatures of pristine and damaged beam, the optimum frequency range is identified. It is inferred that the sensitivity of the patch for a particular material for the given geometry varies significantly under a given frequency range. The findings are discussed and presented. [ABSTRACT FROM AUTHOR]