Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2006-01-24
2006-01-24
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
Reexamination Certificate
active
06989726
ABSTRACT:
A high-frequency filter circuit comprises a first coupled transmission line system (G1) including a first line (TL1) having a line end (1A) serving as an input port (1) and a line end (1B) serving as an open end and second and third lines (TL2,TL3) provided on both sides of the first line (TL1) and a second coupled transmission line system (G2) including a first line (TL1) having line end (1A) serving as an output port (2) and a line end (1B) serving as an open end and second and third lines (TL2,TL3) provided on both sides of the first line (TL1). In the first and second coupled transmission line systems (G1,G2), the line ends (2B) of the second lines (TL2) and the line ends (3A) of the third lines (TL3) are open ends, and the line end (2A) of the second line (TL2) of one of the systems and the line end (3B) of the third line (TL3) of the other system are interconnected through phase lines (3, 4). Thus, a favorable filter characteristic of high steepness and low insertion loss can be obtained, and a high-frequency filter circuit easy to produce, suitable for MMIC, small, lightweight, and produced at low cost and a high-frequency communication device are provided.
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Ham Seungsook
Sharp Kabushiki Kaisha
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