Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2011-08-09
2011-08-09
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S134000
Reexamination Certificate
active
07994875
ABSTRACT:
The present invention discloses a tri-frequency duplexer circuit and multi-frequency duplexer circuit. The tri-frequency duplexer circuit comprises a microstrip line circuit, two first mushrooms, two second mushrooms and two third mushrooms. The microstrip line circuit comprises a first Input/Output (I/O) port, a second I/O port, a third I/O port and a fourth I/O port. The two first mushrooms are respectively disposed at transmission line paths between the first I/O port and the second I/O port and between the first I/O port and the third I/O port. The two second mushrooms are respectively disposed at transmission line paths between the first I/O port and the second I/O port and between the first I/O port and the fourth I/O port. The two third mushrooms are respectively disposed at transmission line paths between the first I/O port and the third I/O port and between the first I/O port and the fourth I/O port.
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Horii, “A Compact Band Elimination Filter Composed of a Mushroom Resonator Embedded in a Microstrip Line Substrate”, Microwave Conference Proceedings, APMC 2005 Proceedings, Dec. 2005, pp. 1-4.
Chen, Fu Chiarng, et al., “The multi-band EBG characteristic of the mushroom structure with the suspending microstrip line”, Department of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan, R.O.C., Sep. 2008.
Chen Fu-Chiarng
Wang Shi-Yung
Ham Seungsook
King Anthony
National Chiao Tung University
WPAT, P.C.
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