Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Reexamination Certificate
2007-01-16
2007-01-16
Ham, Seungsook (Department: 2817)
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
C333S164000
Reexamination Certificate
active
10823490
ABSTRACT:
Provided is a broadband phase shifter using a coupled line and parallel open and short stubs. The broadband phase shifter of the present research has a new switching network structure by forming a coupled line, main transmission lines and parallel λ/8 (45°) open and short stubs on both ends of the main transmission lines in order to obtain broadband phase characteristic that the phase difference between two networks is uniform. The broadband phase shifter includes a first path network including a reference standard transmission line whose input/output characteristic impedance is Z0and electrical length is θ1; a second path network having two symmetrical main transmission lines connected to each other by a coupled line in the center and parallel open and short stubs connected to both ends of the two symmetrical main transmission lines, the main transmission lines having characteristic impedance Zmand an electrical length θmand the parallel open and short stubs having characteristic impedance Zsand an electrical length θs; and a switching means for selecting only one path among the first path network and the second path network.
REFERENCES:
patent: 4195271 (1980-03-01), Schiek et al.
patent: 4612520 (1986-09-01), Boire et al.
patent: 6320481 (2001-11-01), Sharma
Eom et al., “Braodband 180 degree Bit Phase Shifter Using a New Switched Network”, IEEE MTT-S International, vol. 1, Jun. 8-13, 2003, pp. 39-42.
Eom “A Study on a New Broadband 180 Phase Shifter Using the Network With Great Phase Dispersive Characteristics”; Korea Electromagnetic Engineering Society Foundation, vol. 14, No. 4, Apr. 20, 2003, pp. 401-412.
Wilds, “Try λ/8 Stubs for fast fixed phase shifts”, Microwaves, Dec. 18, 1979, pp. 67.-68.
Quirarte etal., “Novel Schiffman phase shifters”, IEEE Trans. Microwave theory & Tech. , vol. 41, No. 1, Jan. 1993, pp. 9-14.
Boire etal. “A 4.5 to 18 GHz phase shifter”, IEEE MTT-S Digest, 1985, pp. 601-604.
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Ham Seungsook
LandOfFree
Broadband phase shifter using coupled lines and parallel... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Broadband phase shifter using coupled lines and parallel..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Broadband phase shifter using coupled lines and parallel... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3729047