The resonance structure is that two rows of ground via holes are placed symmetrically along two sides of the CB-CPW central conductor; each row of the via holes are equally spaced; every via hole connects a top shield plane layer, a first middle layer and a bottom shield plane layer of the magnetic probe; every via hole is placed out of a rectangle gap at the bottom of the magnetic probe; the via holes form a fence. The construction method: 1. constructing a simulation model formed by the magnetic probe and a 50Ω microstrip in a CST® microwave studio; 2. simulation setting; 3. placing via holes along two sides of the central conductor; 4. connecting a 50Ω matching load to the second end of the microstrip and defining the first end as microstrip port1; defining the end on which mount a SMA connector as probe port2; simulating S21.