WE CLAIM:
1. A printed board, comprising:
an external interface;
5 a frame ground trace electrically connected to the external interface;
a circuit member spaced from the frame ground trace; and
a resonance trace disposed between the frame ground trace and the circuit
member with a gap present between the resonance trace and the frame ground trace,
the resonance trace being connected to the circuit member at at least two
10 positions,
the resonance trace and the circuit member together forming a loop member configured in a form of a closed circuit of the resonance trace and the circuit member.
2. The printed board according to claim 1, wherein the resonance trace is
15 connected to the circuit member with an electronic component interposed between the
resonance trace and the circuit member.
3. The printed board according to claim 1 or 2, wherein
the resonance trace includes a first resonance trace part and a second resonance 20 trace part,
the loop member includes a first loop part and a second loop part,
the first resonance trace part is connected to the circuit member and constitutes at least part of the first loop part, and
the second resonance trace part is connected to the circuit member and
25 constitutes at least part of the second loop part.
4. The printed board according to claim 3, wherein
the circuit member includes a first circuit part and a second circuit part, the second circuit part being stacked above the first circuit part with a gap present between
19

the first circuit part and the second circuit part,
the first resonance trace part is connected to the first circuit part and constitutes at least part of the first loop part, and
the second resonance trace part is connected to the second circuit part and
5 constitutes at least part of the second loop part.
5. The printed board according to claim 4, wherein the first resonance trace part and the second resonance trace part are electrically connected to each other.
10 6. The printed board according to any one of claims 1 to 5, wherein the
resonance trace has a zigzag shape.
7. The printed board according to any one of claims 1 to 6, wherein the
resonance trace has a resonance frequency, the resonance frequency of the resonance
15 trace includes a frequency of an electromagnetic noise entering the external interface.
8. The printed board according to any one of claims 1 to 7, wherein the
resonance frequency of the resonance trace includes a communication frequency and a
clock frequency both used in the circuit member.