Performance improvement of mobile DVB-H terminals using a reconfigurable impedance tuning network

Sánchez-Pérez, César; Mingo, J. de; García-Dúcar, Paloma; Carro, Pedro L.

doi:10.1109/tce.2009.5373745

Cited by 17 publications

(4 citation statements)

References 17 publications

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“…The best input impedance matching states do not have to agree with the best states of minimum insertion losses. Although there is a clear relationship, the fact that the dissipative losses may vary depending on the states proposed to the network [13,14,23,24] makes that both conditions could be achieved in different configurations. To verify this statement, an optimization process is also carried out by applying genetic algorithms, but using as an objective function the insertion losses and thus, we seek to maximize S21.…”

Section: Radio-over-fiber Architecture Applicationmentioning

confidence: 99%

Triple-Band Concurrent Reconfigurable Matching Network

et al. 2021

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Reconfigurable Matching Networks (RMN) have found a wide range of applications, such as antenna impedance matching (Antenna Tuning Units -ATU-), the design of reconfigurable power amplifiers, applications in Magnetic Resonance Imaging (MRI), adjustable low noise amplifier design, etc. In this paper, we propose the experimental design and verification of a reconfigurable impedance synthesis network that can simultaneously work in three different bands and is completely independent so that the impedance variations in a frequency band are approximately transparent to the rest. The variable elements used in this paper are varactors. To verify its operation, it is applied to a process of matching a laser modulator in three different frequency bands for C-RAN (Cloud Radio Access Networks) applications. Experimental results demonstrate, as expected, that losses may depend on the state in which they are driven. Consequently, a state that can guarantee a good match could also imply greater losses, leading to a certain trade-off. The application of genetic algorithms in this context points out that it may be convenient to optimize the insertion losses of the complete chain instead of the return losses.INDEX TERMS Multiband Reconfigurable Matching Network (RMN), reconfigurable devices, load-pull.

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Section: Radio-over-fiber Architecture Applicationmentioning

confidence: 99%

Triple-Band Concurrent Reconfigurable Matching Network

et al. 2021

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“…Impedance matching is a fundamental requirement of the microwave components. Techniques involving fixed matching networks have been extensively investigated; however, we have observed a recent surge in the number of studies related to reconfigurable matching network (RMN), which has illustrated its ability to solve new challenges as well as to display advanced applications in systems such as radio-frequency (RF) power amplifiers [1][2][3], low-noise amplifiers [4], on-chip noise measurement systems [5,6], and antenna applications [7][8][9][10][11][12]. With the increasing usage of RMNs, it is more critical to design effective inexpensive circuits with simple compact matching networks that depict small reflections, low insertion loss, extensive bandwidth and extensive impedance coverage on the Smith chart.…”

Section: Introductionmentioning

confidence: 99%

Broadband reconfigurable matching network using a non‐uniform transmission line

Chen

Liu

2018

IET Circuits, Devices & Systems

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In this study, the authors propose the use of distributed elements interconnected with switches to construct a reconfigurable matching network (RMN). Several RMNs are constructed using tunable lumped elements. However, this technique increases the system complexity because of the use of digital-to-analogue converters and synthesis algorithms. In this study, the proposed RMN employs a non-uniform transmission line with adjustable characteristic impedances, which are controlled by opening or closing the switches. While previous studies on non-uniform transmission lines have aimed to investigate the fixed configurations, this topology is designed to be an RMN that satisfies the design challenges. The maximum dimension is 0.2 times the guided wavelength of the low operational frequency, and five switches are used; however, the matchable impedances cover an extensive range of the Smith chart, and the RMN successfully tunes inherently unmatched antennas to operate at a target frequency band that depicts a fractional bandwidth of 60%. Additionally, the evaluated results depict that the fabricated RMN illustrates low insertion loss and high transducer gain and that it achieves both antennamismatch compensation and antenna-bandwidth extension.

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“…Note, the frequency agility can also be realized via reconfigurable matching networks. Sánchez‐Pérez et al propose a UHF band reconfigurable impedance tuning network, which can be used to improve reception on DVB‐H terminals . The tunable matching network approach is also employed in to provide a comprehensive LTE band coverage on phones.…”

Section: Introductionmentioning

confidence: 99%