Ultra wide bandwidth balun
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United States of America Patent
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Nov 11, 2008
Grant Date -
Jul 26, 2007
app pub date -
Jan 16, 2007
filing date -
Jan 24, 2006
priority date (Note) -
Expired
status (Latency Note)
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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.
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