| 摘要 |
In a filter structure for suppressing a spurious signal, a conductor layer in a printed circuit board comprises a pattern with interconnected pattern elements (106 to 114). A pattern element includes a low-impedance conductive region (119) the capacitance of which against a second conductor layer of the printed circuit board is dominant over the inductance. A pattern element comprises at least two adjacent high-impedance conductor strips (115, 116) in a first direction, connected to a low-impedance conductive region, and at least two adjacent high-impedance conductor strips (117, 118) in a second direction, connected to the low-impedance conductive region. The inductance of each high-impedance conductor strips is dominant over the capacitance against the second conductor layer. The high-impedance conductor strips form together with the low-impedance conductive region a plurality of resonance points in the frequency range, thus achieving sufficient stop-band width. |
