Sleeve dipole antenna for suppressing leakage current of feeder cable

The present invention relates to a sleeve dipole antenna for suppressing a leakage current of a feeder cable and provides the sleeve dipole antenna capable of being used for an early diagnosis apparatus of breast cancer. The present invention to achieve the purpose includes: a radiating element to perform as an antenna radiator; a feeding cable which is connected to one end of the radiating element via a connector for supplying power to the radiating element; and a stub for matching impedance and suppressing the leakage current. The radiating element includes; a first element portion formed in a cylindrical sleeve shape; a dielectric which is disposed on the top of a first element portion with a predetermined dielectric constant and to miniaturize the length of a second element portion; and a second element portion formed in a helical shape on the dielectric.