High-frequency enhanced three-coaxial shielding effectiveness testing system and testing method thereof

The invention relates to the field of high-frequency connection units, high-frequency connection wire harnesses and high-frequency cable testing, and discloses a high-frequency enhanced three-coaxial method shielding effectiveness testing system and a testing method. The high-frequency enhanced three-coaxial method shielding effectiveness testing system comprises a testing part, the testing part comprises a testing sleeve, a testing mechanism is arranged in the testing sleeve, the testing mechanism comprises a tested connection unit, two ends of the tested connection unit are respectively connected with a matching load and a connection cable, the connection cable is externally connected with an adjustable impedance, and the testing sleeve can be filled with dielectrics with different dielectric constants according to different test frequency bands. By adjusting the coupling distance, the external impedance and the effective coupling space dielectric constant, the method for testing the shielding effectiveness