Patent ID: 8575926

Claim:
A planar magnetic field probe, for detecting a magnetic field intensity generated by a current of a signal line to be detected, the planar magnetic field probe comprising: a first substrate; a second substrate, located on the first substrate; a first through via, penetrating through the first substrate and the second substrate; a second through via, penetrating through the first substrate and the second substrate; a first patterned induction metal layer, formed between the first substrate and the second substrate, and the first patterned induction metal layer comprising: a first induction loop pattern, having a first end and a second end, and the first end of the first induction loop pattern being connected to the first through via; a second induction loop pattern, having a first end and a second end, and the first end of the second induction loop pattern being connected to the second through via; and a induction wire, having a first end and a second end respectively connected to the second end of the first induction loop pattern and the second end of the second induction loop pattern, wherein induction currents generated by induction the magnetic field intensity by the first induction loop pattern and the second induction loop pattern have a same current direction on the induction wire; a first patterned shielding metal layer; and a second patterned shielding metal layer, wherein the second patterned shielding metal layer and the first patterned shielding metal layer are respectively formed on outer sides of the first substrate and the second substrate, wherein the first patterned shielding metal layer comprises two first symmetric ring-shape patterns, the second patterned shielding metal layer comprises two second symmetric ring-shape patterns, projection areas of the two first symmetric ring-shape patterns on the second patterned shielding metal layer are overlapped to the two second symmetric ring-shape patterns, projection areas of the first induction loop pattern and the second induction loop pattern on the second patterned shielding metal layer are respectively located within the two second symmetric ring-shape patterns, and the first through via and the second through via are located between the two second symmetric ring-shape patterns and are respectively located at two sides of the induction wire.