GaAs monolithic Lange and Wilkinson couplers

Waterman, R.C.; Fabian, Walter M. F.; Pucel, R.A.; Tajima, Yusuke; Vorhaus, J.L.

doi:10.1109/t-ed.1981.20313

Cited by 26 publications

(3 citation statements)

References 2 publications

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“…To design a wide-band balanced LNA, a low-loss and high-coupling 90 ˚coupler which covers a wide band must be firstly realized. The Lange coupler and Wilkinson coupler (branch-line coupler) are commonly used as 90 ˚couplers [5,6] . In this design, the Lange coupler is adopted because it occupies less chip area.…”

Section: Design Of Lange Couplermentioning

confidence: 99%

Design of a 24–40 GHz balanced low noise amplifier using Lange couplers

Zhang¹,

Huang²,

Mingli³

et al. 2009

J. Semicond.

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A wide band (24–40 GHz) fully integrated balanced low noise amplifier (LNA) using Lange couplers was designed and fabricated with a 0.15 μm pseudomorphic HEMT (pHEMT) technology. A new method to design a low-loss and high-coupling Lange coupler for wide band application in microwave frequency was also presented. This Lange coupler has a minimum loss of 0.09 dB and a maximum loss of 0.2 dB over the bandwidth from 20 to 45 GHz. The measured results show that the realized four-stage balanced LNA using this Lange coupler exhibites a noise figure (NF) of less than 2.7 dB and the maximum gain of 30 dB; moreover, a noticeably improved reflection performance is achieved. The input VSWR and the output VSWR are respectively less than 1.45 and 1.35 dB across the 24–40 GHz frequency range.

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Section: Design Of Lange Couplermentioning

confidence: 99%

Design of a 24–40 GHz balanced low noise amplifier using Lange couplers

Zhang¹,

Huang²,

Mingli³

et al. 2009

J. Semicond.

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“…The resulting broadside-coupling offers the advantage of very tight coupling over the traditional edge-coupled 2-line coupler. The design layout is less intricate than those required for interdigitated couplers, such as the Lange coupler, which has been used on MMICs for many years [3]. Also, since the conductive tracks of the multi-layer coupler are much wider than those used for interdigitated couplers, they are less sensitive to process variations.…”

Section: Introductionmentioning

confidence: 99%

An Improved Multi-Layer Quadrature Coupler for MMICs

Lucyszyn

Robertson

1991

21st European Microwave Conference, 1991

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A novel technique for significantly reducing the insertion loss of multi-layer quadrature couplers is presented.With previous broadside multi-layer couplers, realized on GaAs MMICs, the upper conducting layer track is overlayed exactly onto the much thinner lower conducting layer track -resulting in a high insertion loss. A new multi-layer structure is presented that has an upper track which is offset -so that the lower track can be plated-up with the much thicker metal from the upper track, thus, reducing the even-mode insertion loss.A coupler, with a centre frequency of 7.7GHz, incorporating this technique has been realized on a GaAs MMIC, with maximum dimensions of only 1.lxO.8nmu. The resulting insertion loss at centre frequency is less than 1dB. The overall performance has been found to equally match that of the Lange coupler.

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“…Performance of Lange couplers fabricated on semi -insulating GaAs substrates has been previously documented (1), (2).…”

Section: Introductionmentioning

confidence: 99%