Balun

Details Balun Balun

2007-09-25

2007-09-25

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S238000

Reexamination Certificate

active

10549672

ABSTRACT:
A balun in which the phase shift may be reduced significantly is disclosed. The balun has three lines, i.e. a first line b, a second line a and a third line c, arranged in parallel with the ground surface. The second line a and the third line c are arranged at the same height from the ground surface GC, the longitudinal length of each respective one of the first line b, second line a and third line c are specified to be equal to a quarter (¼) of the wavelength at the central frequency in the working band, and the capacitance Ca between the second line a and the ground surface GC is specified to be equal to the capacitance Cab between the second line a and the first line b. Furthermore, the distance h3between the center of each respective one of the second line a and third line c in the height direction and the ground surface GC located closer to each respective one of the second line a and third line c is specified to be longer than the distance h2between the center of the first line b in the height direction and the center of each respective one of the second line a and third line c in the height direction, or the permittivity of a dielectric D3is specified to be less than that of a dielectric D2.

REFERENCES:
patent: 5304959 (1994-04-01), Wisherd et al.
patent: 6294965 (2001-09-01), Merrill et al.
patent: 6982609 (2006-01-01), McKay et al.
patent: 10-163715 (1998-06-01), None
patent: 915140 (1982-03-01), None

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