Multilayer MMIC branch-line coupler and broad-side coupler

Toyoda, Ichihiko; Hirota, Tomoyoshi; Hiraoka, T.; Tokumitsu, T.

doi:10.1109/mcs.1992.186003

Cited by 71 publications

(30 citation statements)

References 6 publications

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“…Photonic-bandgap structures that can be implemented in a microstrip line allow reduction of length [20], but explicit design formulas are as yet unavailable. Another approach is to replace a long length of TL with a shorter length of TL with shunt capacitances at each end [21], [22]. In this paper, we demonstrate that meandered ATLs result in significant reduction of circuit size.…”

Section: Introductionmentioning

confidence: 76%

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Compact dual-fed distributed power amplifier

Eccleston

2005

IEEE Trans. Microwave Theory Techn.

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Abstract-The dual-fed distributed amplifier (DFDA) allows efficient combining of field-effect transistors (FETs) at the device level without using -way power combiners. However, the FETs must be spaced 180 , resulting in physically large circuits. In this paper, meandered artificial transmission lines (TLs) comprised of microstrip lines periodically loaded with short open-circuit stubs can be used in place of TLs to reduce the size. The approach incorporates FET input and output capacitances with the artificial TLs, thereby eliminating their detrimental effects on bandwidth and performance. Both simulation and experimental results of a class-A three-FET single-ended DFDA designed to operate at 1.8 GHz demonstrate the feasibility of this approach and the validity of the design method. The size reduction is approximately one-third compared to realization using microstrip lines only, and the maximum efficiency is greater than 35% over a bandwidth of 15%.Index Terms-Distributed amplifiers, microstrip circuits, microwave field-effect transistor (FET) amplifiers, microwave power FET amplifiers.

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Section: Introductionmentioning

confidence: 76%

“…1, and to investigate the feasibility of reducing the size of the SE DFDA using capacitive loading [21], [22] at the FET ports. To eliminate other artifacts such as nonlinearity, parasitic inductances, etc., the FETs were represented by a simple linear model comprising a transconductance and input and output capacitances.…”

Section: Introductionmentioning

confidence: 99%

Compact dual-fed distributed power amplifier

Eccleston

2005

IEEE Trans. Microwave Theory Techn.

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“…With the use of another dielectric and metallization layer, broadside coupling can also be obtained for the thin-film microstrip lines (upper right structure in Fig. 1), e.g., allowing the realization of couplers [3].…”

Section: Onolithic Microwave Integrated Circuits (Mmic's)mentioning

confidence: 99%

Transmission lines and passive elements for multilayer coplanar circuits on silicon

Warns

Menzel

Schumacher

1998

IEEE Trans. Microwave Theory Techn.

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Abstract-In this paper, propagation properties of both standard and multilayer coplanar lines on different types of silicon substrates, as well as a number of quasi-lumped and stub-type circuit elements, are investigated. For the transmission lines, emphasis is placed on losses. As examples for circuit elements, a lumped parallel resonator and a high-low impedance low-pass filter are demonstrated.

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“…The dual-band branch-line coupler can also be designed by adding four stubs to the conventional coupler [4]. Varieties of miniaturized techniques also have been proposed for reducing sizes of the branch-line coupler circuits [5][6][7][8][9][10][11]. The widely used method is meandering transmission lines [5] or coupled lines [6].…”

Section: Introductionmentioning

confidence: 99%

“…Asymmetrical T-structures [9] and new symmetric equivalent circuits [10] are employed to miniaturize branch-line couplers. But the couplers in [5][6][7][8][9][10] operate only at single frequency band. Recently, compact dualband branch-line couplers with stepped-impedance-stub are proposed [11].…”

Section: Introductionmentioning

confidence: 99%

Novel Compact Dual-Band Branch-Line Couplers With Half Elliptical-Ring Impedance Stub Lines

Han¹,

Jiao²,

Ni³

et al. 2015

PIER Letters

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Abstract-Novel compact dual-band branch-line couplers are presented. By using a half elliptical-ring impedance stub as a basic unit, dual-band branch-line couplers are obtained. Since a couple of half elliptical-ring impedance stubs can be folded inward to its enclosed area without overlap, the branch-line coupler can be miniaturized. In order to verify the effectiveness of the half elliptical-ring impedance stub, two different branch-line couplers operating at 2.4/5.8 GHz are designed, fabricated and tested. Measured results agree well with simulated ones. Compared with the stepped-impedance-stub branchline couplers, sizes of the proposed couplers are reduced by 43% and 30%, respectively.

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Multilayer MMIC branch-line coupler and broad-side coupler

Cited by 71 publications

References 6 publications

Compact dual-fed distributed power amplifier

Compact dual-fed distributed power amplifier

Transmission lines and passive elements for multilayer coplanar circuits on silicon

Novel Compact Dual-Band Branch-Line Couplers With Half Elliptical-Ring Impedance Stub Lines

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