A recombinant, in-phase power divider

Goldfarb, M.

doi:10.1109/22.85423

Cited by 32 publications

(13 citation statements)

References 6 publications

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“…On the other hand, the RF splitter/combiner and bandpass filters are designed with different requirements. For instance, the RF splitter has three outputs and the configuration in [28] is referred. The center frequency locates at .…”

Section: A Experimental Setup and Link Budget Estimationmentioning

confidence: 99%

“…In general, the signal can be expressed as (26) In this case, the output voltage can be calculated by using the power series in (1): (27) where is the th order mixing vector and it is in the form of [25] (28) and is the mixing coefficient. In the meantime, the mixing coefficients must satisfy that (29) Also, as expressed in (27), is the multinomial coefficient, is the mixing voltage and is the mixing frequency respectively.…”

Section: Appendixmentioning

confidence: 99%

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Nonlinear Communication System With Harmonic Diversity

Cheong

Tam

2015

IEEE Trans. Microwave Theory Techn.

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This paper presents the concept and demonstration of harmonic diversity for wireless communication, which makes use of multiple harmonic radio frequency (RF) channels with respect to the carrier frequency. Rather than frequency and space diversities widely used today to improve multipath fading, signal quality and spectral efficiency, the proposed scheme does not require multiple RF transceiver front-ends. The advantages of inherent RF device nonlinear characteristics are harnessed to produce and process harmonics within single transceiver. Even though distinct harmonic channels will exhibit different order of phase shifts, the analysis shows that such phase offsets can be compensated by adjusting the phase of local oscillator (LO) at receiver end. Extending the framework of the Shannon theorem, an -channel harmonic communication system is shown to reduce the minimum required signal-to-noise ratio (SNR) at the input of receiver by -times. In addition, this work indicates that the power consumption of transmitter can be significantly reduced up to 66% than the conventional ones. Through the analysis of channel capacity, the harmonic system is proved to outperform the single channel counterpart especially when SNR is low. To validate the correctness of the proposed concept, a series of experiments are carried out to emulate the developed theoretical models. For instance, a three-channel harmonic communication system is prototyped, involving certain RF harmonic components designed for demonstration. The retrieved signal strengths are examined with different phase setting of receiving LO, and various modulation techniques are applied for estimating the system performances. All measured results are in agreement with their simulated counterparts, thereby demonstrating the correctness and usefulness of the proposed theories and techniques for nonlinear communication systems of harmonic diversity.

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Section: A Experimental Setup and Link Budget Estimationmentioning

confidence: 99%

Section: Appendixmentioning

confidence: 99%

Nonlinear Communication System With Harmonic Diversity

Cheong

Tam

2015

IEEE Trans. Microwave Theory Techn.

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“…Another possible solution is offered by a proper combination of two-way Wilkinson structures to realize an N-way even if the resulting solutions are clearly closer to a corporate combiner (see section 10.11) rather than to a stand-alone Wilkinson [58]. For instance, a schematic structure of a three-way Wilkinson based on the use of a combination of even and uneven two-way Wilkinson is reported in Fig.…”

Section: Planarization Of N-way Wilkinson Splitter/combinermentioning

confidence: 99%

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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“…These structures have an inherent limitation over the physical dimensions of the high impedance transmission lines when realized to be in microstrip configuration using conventional fabrication techniques. A new topology proposed by Goldfarb (1991) that employs recombinant approach provides in phase equal/unequal amplitude power division. Dividers with an odd number of three or five or more output ports can be realized using conventional microstrip fabrication techniques with the help of this approach.…”

Section: Introductionmentioning

confidence: 99%

A new recombinant in-phase microstrip power divider

Babu¹,

Singh²,

Jha³

2005

International Journal of Electronics

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The theory and design aspects of n-way in-phase power divider employing Goldfarb recombinant topology are described. The merits of this divider over conventional ones are also presented here. A microstrip version of five output port power divider is designed and developed with 1.7 mm Bakelite substrate to operate in S-band. The measured values of input VSWR, insertion loss, isolation, return loss and phase difference between output ports at different frequencies in S-band for the fabricated power divider are presented and discussed.

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A recombinant, in-phase power divider

Cited by 32 publications

References 6 publications

Nonlinear Communication System With Harmonic Diversity

Nonlinear Communication System With Harmonic Diversity

Power Combining

A new recombinant in-phase microstrip power divider

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