Design of high-efficiency compact Doherty power amplifier with harmonics suppression and wide operation frequency band

Nouri, Mohammad Ehsan; Roshani, Sobhan; Mozaffari, Mohammad Hazhir; Nosratpour, Arez

doi:10.1016/j.aeue.2020.153168

Cited by 17 publications

(6 citation statements)

References 36 publications

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“…In fact, the WPD was first proposed by Ernest J. Wilkinson in 1960 4 . Since then it has widely used in modern communication systems, such as Doherty power amplifiers 5 , balanced power amplifiers 6 , 7 , push–pull power amplifiers 8 , antenna feed networks 9 , phase shifters 10 , and RF/microwave frontend systems 11 .…”

Section: Introductionmentioning

confidence: 99%

Size reduction and performance improvement of a microstrip Wilkinson power divider using a hybrid design technique

Jamshidi

Roshani

Talla

et al. 2021

Sci Rep

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In the design of a microstrip power divider, there are some important factors, including harmonic suppression, insertion loss, and size reduction, which affect the quality of the final product. Thus improving each of these factors contributes to a more efficient design. In this respect, a hybrid technique to reduce the size and improve the performance of a Wilkinson power divider (WPD) is introduced in this paper. The proposed method includes a typical series LC circuit, a miniaturizing inductor, and two transmission lines, which make an LC branch. Accordingly, two quarter-wavelength branches of the conventional WPD are replaced by two proposed LC branches. Not only does this modification lead to a 100% size reduction, an infinite number of harmonics suppression, and high-frequency selectivity theoretically, but it also results in a noticeable performance improvement practically compared to using quarter-wavelength branches in the conventional microstrip power dividers. The main important contributions of this technique are extreme size reduction and harmonic suppression for the implementation of a filtering power divider (FPD). Furthermore, by tuning the LC circuit, the arbitrary numbers of unwanted harmonics are blocked while the operating frequency, the stopband bandwidth, and the operating bandwidth are chosen optionally. The experimental result verifies the theoretical and simulated results of the proposed technique and demonstrates its potential for improving the performance and reducing the size of other similar microstrip components.

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Section: Introductionmentioning

confidence: 99%

Size reduction and performance improvement of a microstrip Wilkinson power divider using a hybrid design technique

Jamshidi

Roshani

Talla

et al. 2021

Sci Rep

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“…A variety of modified WPD configurations have emerged over the years to cater to the needs of wideband, harmonic-suppressed, and multi-standard topologies [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Recently, the wideband WPDs have gained paramount importance in various applications such as power amplifiers [ 28 , 29 , 30 , 31 ], Hilbert transformer-based dual-band single sideband modulator [ 32 , 33 ], antenna arrays [ 34 ], phase shifters [ 35 ], and other RF front-end systems [ 36 ]. This is mainly due to the recent progress in high data-rate 5G/6G wireless systems that has refueled significant research interest in developing the next generation of wideband power dividers [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Analytical Design Technique for a Wideband Wilkinson Power Divider Using Dual-Band Topology

Omi

Islam

Maktoomi

et al. 2021

Sensors

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In this paper, a novel analytical design technique is presented to implement a coupled-line wideband Wilkinson power divider (WPD). The configuration of the WPD is comprised of three distinct coupled-line and three isolation resistors. A comprehensive theoretical analysis is conducted to arrive at a set of completely new and rigorous design equations utilizing the dual-band behavior of commensurate transmission lines. Further, the corresponding S-parameters equations are also derived, which determine the wideband capability of the proposed WPD. To validate the proposed design concept, a prototype working at the resonance frequencies of 0.9 GHz and 1.8 GHz is designed and fabricated using 60 mils thick Rogers’ RO4003C substrate. The measured result of the fabricated prototype exhibits an excellent input return loss > 16.4 dB, output return loss > 15 dB, insertion loss < 3.30 dB and a remarkable isolation > 22 dB within the band and with a 15 dB and 10 dB references provide a fractional bandwidth of 110% and 141%, respectively.

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“…Microstrip structures are widely used in microwave devices. Microwave filter is basic device which can be used to design the other microwave devices, such as diplexers [1][2], power dividers [3][4], power amplifiers [5][6] and several other devices for mobile and wireless communications systems [7]. In communication applications, sometimes it is necessary to separate the lowpass frequencies from the higher frequencies.…”

Section: Introductionmentioning

confidence: 99%

Design of a Microwave Lowpass – Bandpass Filter using Deep Learning and Artificial Intelligence

Roshani¹,

Heshmati²,

Roshani³

2021

JIEC

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In this paper, a lowpass – bandpass dual band microwave filter is designed by using deep learning and artificial intelligence. The designed filter has compact size and desirable pass bands. In the proposed filter, the resonators with Z-shaped and T-shaped lines are used to design the low pass channel, while coupling lines, stepped impedance resonators and open ended stubs are utilized to design the bandpass channel. Artificial neural network (ANN) and deep learning (DL) technique has been utilized to extract the proposed filter transfer function, so the values of the transmission zeros can be located in the desired frequency. This technique can also be used for the other electrical devices. The lowpass channel cut off frequency is 1 GHz, with better than 0.2 dB insertion loss. Also, the bandpass channel main frequency is designed at 2.4 GHz with 0.5 dB insertion loss in the passband.

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Design of high-efficiency compact Doherty power amplifier with harmonics suppression and wide operation frequency band

Cited by 17 publications

References 36 publications

Size reduction and performance improvement of a microstrip Wilkinson power divider using a hybrid design technique

Size reduction and performance improvement of a microstrip Wilkinson power divider using a hybrid design technique

A Novel Analytical Design Technique for a Wideband Wilkinson Power Divider Using Dual-Band Topology

Design of a Microwave Lowpass – Bandpass Filter using Deep Learning and Artificial Intelligence

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