Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1992-03-30
1994-04-19
Lee, Benny
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333115, 333116, 333118, H01P 516
Patent
active
053049616
ABSTRACT:
A lumped impedance transforming directional coupler including a first reactive element, a second reactive element coupled to the first reactive element at a first port, a third reactive element coupled to the second reactive element at a second port, a fourth reactive element coupled to the first reactive element at a third port and to the first reactive element at a fourth port, and the first, the second, the third, and the fourth ports each coupled through a first, a second, a third, and a fourth capacitor, respectively, to electrical ground, the reactive elements and the capacitors providing impedance transformation. Alternate embodiments include a lumped element directional coupler arising from a distributed impedance transforming directional couplers with a pair of transmission lines one-fourth of a wavelength of a center operating frequency in length, and a second pair of transmission lines three-fourths of that wavelength in length.
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An article entitled "Transform Impedance with a Branch Line Coupler," Microwaves, vol. 15, May 1976, pp. 47-52.
Lee Benny
Motorola Inc.
Nehr Jeffrey D.
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