Single-Frequency Analysis of Radial and Planar Amplifier Combiner Circuits

Galani, Z.; Lampen, James; Temple, S.J.

doi:10.1109/tmtt.1981.1130423

Cited by 13 publications

(2 citation statements)

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“…The de-embedded insertion loss for a single combiner was <0.1 dB at 500 MHz. The corresponding combining efficiency [5], is better than 95% from 478 to 520 MHz with a maximum value of 98.7% at 500 MHz. This value reconfirms negligible power lost due to the amplitude/phase imbalance, measured at the low power.…”

Section: Experimental Investigation and Measured Resultsmentioning

confidence: 99%

“…The N -way power combiner, in such architecture, needs to handle high power as it sums output signals from multiple amplifier modules. Its insertion loss and any imbalance [5] in forward transmission coefficient directly affect the transmitter efficiency [6]. It governs [7] the graceful degradation [8] performance and thus available output power of the transmitter [9].…”

Section: Introductionmentioning

confidence: 99%

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Design and analysis of a high-power radial multi-way combiner

Jain

Gupta

Sharma

et al. 2013

Int. j. microw. wirel. technol.

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In this paper, the design analysis of a multi-way and high-power radial combiner is presented. This combiner incorporates a rigid stripline-type combining structure. This analysis, based on an equivalent circuit model and segmentation of the radial transmission line, provides simple design formulae. The developed methodology, after fine-tuning with the help of an electromagnetic full-wave simulator, is physically demonstrated by developing a high-power (16 kW average) and high combining-efficiency (98.9%) 16-way combiner at the center frequency of 505.8 MHz. Its efficient and repeatable performance, fabrication-friendly structure, and absence of the heat-related problem, caused by the isolation resistor, are the main features of this design.

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Section: Experimental Investigation and Measured Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and analysis of a high-power radial multi-way combiner

Jain

Gupta

Sharma

et al. 2013

Int. j. microw. wirel. technol.

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show abstract

Power Combining

general

2009

High Efficiency RF and Microwave Solid State Power Amplifiers

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Power amplifiers are employed in a variety of system applications, where the required power levels are largely different, varying from mW to kW [1,2]. Consequently, a wide variety of PA realizations results, from travelling-wave tube amplifiers in very high power systems [3,4], in satellite payloads or radars, to solid-state amplifiers for medium-low power systems [5,6], such as wireless communication handsets. The request for high output power levels is influencing device technologies adopted for PA module realization [7,8]. Prior to the development of solid state devices, microwave power amplification and generation were mainly based on the use of vacuum tubes [9, 10], including magnetron, klystron and travelling-wave implementations (TWTAs) [4,11]. These devices still remain in use at kilowatt levels, where solid-state devices cannot compete so far.Nevertheless, the development of high power microwave solid-state device technologies (GaAs HEMT or HBT, GaN HEMT, etc.) may offer an order-of-magnitude improvement in reliability and reduction in size, weight, and low-voltage power-supply requirements as compared to vacuum devices. However, the output power attainable from a single solid-state device is basically limited by thermal and impedance matching problems. To meet system requirements it is therefore mandatory to combine several devices, thus attaining higher power levels. Many power splitting/combining schemes have been investigated and developed, involving different technologies and propagation media, ranging from metal waveguides (cavities, microstrips, striplines, etc.) where the power is confined into a limited region, to open space configurations [12][13][14].Devices involved in power splitting/combining operations are referred to as power splitters/ combiners and they play a key role in the design of high power PA, while being also fundamental components in designing mixers [15], multipliers and oscillators [16,17], or other linear and nonlinear circuits [18]. Moreover, since the proposed schemes can often be adopted for both the tasks of power division and combination, the terms power combining and power splitting are usually adopted simultaneously or interchangeably. Due to their intrinsic reciprocal characteristic in fact, the same device can alternatively be viewed as a power combiner or as a power splitter, depending on the selection of its input and output ports.The key features of power splitting/combining devices are clearly their insertion loss (related to the efficiency), bandwidth and size. The techniques adopted for the optimization of device performance are strictly related to the type of splitting/combining structure and to the selected realization technology. High Efficiency RF and Microwave Solid State Power Amplifiers

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Efficiency of lossless power combiners

Eccleston

1995

Micro & Optical Tech Letters

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This article will examine the combining efjiciency of a lossless power combiner where port mismatch and interinput port coupling are considerable. A derived lower bound for combining efjiciency is compared with simulation results. It is shown that the combining efjiciency of a lossless combiner is maximized when the combiner output match is optimized. ABSTRACTThis article presents a new model of drain current generator suitable for pseudomorphic FETs. The modeling of this generator is based on the integration versus V,, of the rf small-signal transconductance g, .Pulsed measurements of IDs (VDs, VGs) are performed to verifi the validity of the simulation results obtained when using the MDS simulator. 0 1995 John Wiley & Sons, lnc.

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Single-Frequency Analysis of Radial and Planar Amplifier Combiner Circuits

Cited by 13 publications

References 13 publications

Design and analysis of a high-power radial multi-way combiner

Design and analysis of a high-power radial multi-way combiner

Power Combining

Efficiency of lossless power combiners

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