Filtering Performance of Microacoustic-based Matching Networks for Wake-Up Applications

AbstractMatching the antenna’s impedance to the RF-front-end of a wireless communications system is challenging as the impedance varies with its surround environment. Autonomously matching the antenna to the RF-front-end is therefore essential to optimize power transfer and thereby maintain the antenna’s radiation efficiency. This paper presents a theoretical technique for automatically tuning an LC impedance matching network that compensates antenna mismatch presented to the RF-front-end. The proposed technique converges to a matching point without the need of complex mathematical modelling of the system comprising of non-linear control elements. Digital circuitry is used to implement the required matching circuit. Reliable convergence is achieved within the tuning range of the LC-network using control-loops that can independently control the LC impedance. An algorithm based on the proposed technique was used to verify its effectiveness with various antenna loads. Mismatch error of the technique is less than 0.2%. The technique enables speedy convergence (< 5 µs) and is highly accurate for autonomous adaptive antenna matching networks.

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Improvement of Small Signal Equivalent Simulations for Power and Efficiency Matching of GaN HEMTs

Electronics ◽

10.3390/electronics10030263 ◽

2021 ◽

Vol 10 (3) ◽

pp. 263

Author(s):

Roberto Quaglia

Keyword(s):

Power Amplifier ◽

High Electron Mobility Transistor ◽

High Electron ◽

Large Signal ◽

Signal Model ◽

Or Efficiency ◽

Summary Table ◽

Matching Networks ◽

Amplifier Design ◽

Frequency Power

In high-frequency power-amplifier design, it is common practice to approach the design of reactive matching networks using linear simulators and targeting a reflection loss limit (referenced to the target impedance). It is well known that this is only a first-pass design technique, since output power or efficiency contours do not correspond to mismatch circles. This paper presents a method to improve the accuracy of this approach in the case of matching network design for power amplifiers based on gallium nitride (GaN) technology. Equivalent mismatch circles, which lay within the power or efficiency contours targeted by the design, are analytically obtained thanks to geometrical considerations. A summary table providing the parameters to use for typical contours is provided. The technique is demonstrated on two examples of power-amplifier design on the 6–12 GHz band using the non-linear large-signal model of a GaN High Electron Mobility Transistor (HEMT).

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Reconfigurable matching networks for wireless transmitters

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI) ◽

10.1109/aps.2013.6711057 ◽

2013 ◽

Author(s):

B. Bukvic ◽

D. Budimir ◽

N. Neskovic

Keyword(s):

Wireless Transmitters ◽

Matching Networks

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Optimizing Losses in Distributed Multiharmonic Matching Networks Applied to the Design of an RF GaN Power Amplifier With Higher Than 80% Power-Added Efficiency

IEEE Transactions on Microwave Theory and Techniques ◽

10.1109/tmtt.2008.2009905 ◽

2009 ◽

Vol 57 (2) ◽

pp. 314-322 ◽

Cited By ~ 37

Author(s):

M. Helaoui ◽

F.M. Ghannouchi

Keyword(s):

Power Amplifier ◽

Power Added Efficiency ◽

Matching Networks

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Improved design optimization approach for high efficiency matching networks

2016 IEEE Energy Conversion Congress and Exposition (ECCE) ◽

10.1109/ecce.2016.7855189 ◽

2016 ◽

Cited By ~ 4

Author(s):

Ashish Kumar ◽

Sreyam Sinha ◽

Alihossein Sepahvand ◽

Khurram K. Afridi

Keyword(s):

Design Optimization ◽

High Efficiency ◽

Optimization Approach ◽

Matching Networks ◽

Improved Design

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Method for Modeling Ultrasonic Driving Circuit and Designing Matching Network

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.629.682 ◽

2012 ◽

Vol 629 ◽

pp. 682-687 ◽

Cited By ~ 1

Author(s):

Bo Xiong Wang ◽

Wen Feng Liu ◽

Jian Nan Liu ◽

Yuan Yuan Cui ◽

Xiu Zhia Luo

Keyword(s):

Time Domain ◽

Power Supply ◽

Ultrasonic Testing ◽

Ultrasonic Transducer ◽

Ultrasonic Transducers ◽

Matching Network ◽

Matching Networks ◽

Impedance Characteristics ◽

Driving Circuit ◽

Attenuation Characteristics

The performances of ultrasonic testing systems are greatly affected by the impedance characteristics of ultrasonic transducers. Conventional methods for designing matching networks consider only the characteristics of matching elements and transducer, while ignoring the effects of other elements of emission circuit. As a consequence, such method cannot give out satisfactory results. In this paper, a modeling method for ultrasonic driving circuits is proposed, which takes into account the power supply, the transformer, the matching networks, as well as the ultrasonic transducer. This method focuses on the performances both in time domain and in frequency domain. A computer simulation and experiments show that this method can provide better attenuation characteristics and energy transmission, and can be widely used for analyzing and designing matching network for ultrasonic testing systems.

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