Shielding effectiveness measurements for an SHF/EHF field-to-wire coupling model

Abstract

The Intrasystem Electromagnetic Compatibility Analysis Program (IEMCAP) is a widely used code for electromagnetic compatibility (EMC) modeling. IEMCAP includes a coupling model for an external field incident on a wire over a ground plane (field-to-wire model). To expand the capability of IEMCAP in the SHF/EHF region, the frequency range of the field-to-wire model was increased to 40 GHz. Since the field-to-wire model must account for shielded cables as well as bare wires, experiments were conducted in a mode-tuned reverberation chamber to measure the shielding effectiveness from 1 GHz to 40 GHz of various types of cables. A wide variety of experimental parameters were surveyed. These included cable type (coaxial cables, twisted pairs), shielding (single and double shields), cable length, termination impedance, and shield termination condition (circumferentially bonded shield, pigtail, ungrounded shield). The shielding measurements were made well outside the normal operating region of the cables under test.<>