Ultra wide bandwidth balun

Details Ultra wide bandwidth balun Ultra wide bandwidth balun

2007-01-16

2008-11-11

Tran, Anh Q (Department: 2819)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S025000, C333S246000

Reexamination Certificate

active

07449975

ABSTRACT:
A balun is a device for coupling together balanced and unbalanced electrical signals. An ultra-wide bandwidth balun can operate in a frequency band of more than 1.5 GHz to 26.5 GHz. The balun can be based upon a resistively loaded choke structure. The loading can be in the form of resistive cards or vanes. The vanes may be aligned with the electric field between the choke and an outer ground to prevent effective short circuits at points where the choke is half wavelength multiples in length. The resistive loading may also suppress higher order modes within the choke structure. The wideband balun can be very small to satisfy the tight space constraints of many modern communication applications. The balun may be fabricated using standard printed circuit board manufacturing techniques which may dramatically reduce production costs.

REFERENCES:
patent: H1244 (1993-10-01), Evans
patent: 7265644 (2007-09-01), Floyd et al.

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