Patent ID: 7538639

Claim:
A filter, comprising: an input portion for receiving electromagnetic signals; a high-impedance transmission portion electrically connected to the input portion, and including a first high-impedance transmission portion, a second high-impedance transmission portion, a third high-impedance transmission portion, a first connection portion, and a second connection portion, wherein the first connection portion comprises a pair of high-impedance transmission lines for electrically connecting the first high-impedance transmission portion and the second high-impedance transmission portion; a low-impedance transmission portion electrically connected to the second high-impedance transmission portion, and including a pair of protrusion portions; and an output portion electrically connected to the third high-impedance transmission portion, for outputting the electromagnetic signals therefrom; wherein the second connection portion electrically connects the second high-impedance transmission portion to the third high-impedance transmission portion.