Patent ID: 7378924

Claim:
A filter comprising: a line conductor; a ground conductor disposed in opposing relation to the line conductor; a dielectric interposed between the line conductor and the ground conductor; the line conductor including first and second line conductor sections provided on a surface of the dielectric in a symmetrical pattern, the line conductor sections having opposed portions separated from each other by an open gap to form a capacitive coupling section therebetween, each of said opposed portions of said first and second line conductor sections substantially elongated from opposing sides of a corresponding line conductor section, each of said opposed portions having a length in a widthwise direction longer than the line width of the corresponding line conductor sections; said capacitive coupling section providing input and output ends of the filter; and a plurality of resonators coupled between said capacitive coupling section at the input and output ends of the filter, each of said resonators having a length equal to an integral multiple of λ/4.