Design of a Small Loop Antenna Operating in VLF band for Shielding Effectiveness Measurement

This paper proposes the design of a small printed loop antenna operating in the VLF band for obtaining improved AF properties. The proposed antenna is composed of a ring shape ferrite core and a printed loop antenna to reduce and simplify the antenna size. The ferrite core allows to concentrate the magnetic flux density on the ferrite surface of the antenna, which can decrease the antenna size. The results show that the antenna is suitable for accurate SE measurement of small shielded enclosures in the VLF band due to the small size and low AF level.