400 W broadband power amplifier using transmission-line transformers with 1:8 impedance transformation ratio

Lee, H.; Jung, Insub; Seo, Munkyo; Kim, H.; Ham, Junghyun; Gu, Jae-Hoi; Yang, Youngoo

doi:10.1080/09205071.2013.811122

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…The 1:1 transmission‐line transformer is simply a coaxial transmission line, which is wound around a circular ferrite core with high permeability. It only has a 1:1 impedance transformation ratio but can make a single‐ended signal to a balanced signal or vice versa . After the 1:1 transformer, two 1:4 transmission‐line transformers are used in single‐ended mode to convert the impedance of the signal‐end of the balanced ports .…”

Section: Analysis and Circuit Configurationmentioning

confidence: 99%

Ultrabroadband balun with 1:4 impedance transformation ratio using transmission‐line transformers

Lee

Kwon

et al. 2014

Micro & Optical Tech Letters

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This article presents an ultrabroadband balun with 1:4 impedance transformation ratio using transmission‐line transformers. The proposed ultrabroadband balun consists of one 1:1 transmission‐line transformer as a balun and two 1:4 transmission‐line transformers for impedance transformation. Each transmission‐line transformer is based on a coaxial line, which is wound around a ferrite core to extend the bandwidth to the lower frequency region. Experimentally optimized offset transmission lines are used to compensate for the phase imbalance characteristics at the high frequency band. The implemented ultrabroadband balun operates from 300 kHz to 400 MHz with a return loss of below 12 dB and an insertion loss of less than 1 dB. The magnitude and phase imbalance for the balanced signal output are both less than 0.5 dB and 2.0°, respectively. An outstanding relative bandwidth (the ratio of the highest frequency to the lowest frequency in the operational band) of 1330 was achieved. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1974–1978, 2014

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Section: Analysis and Circuit Configurationmentioning

confidence: 99%

Ultrabroadband balun with 1:4 impedance transformation ratio using transmission‐line transformers

Lee

Kwon

et al. 2014

Micro & Optical Tech Letters

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“…The design of broadband power amplifiers using high-power transistors has been an interesting research topic. Input and output matching networks for broadband power amplifier should be designed to match very low source and load impedances, which are likely to be less than a few Ω, to the system impedance of 50 Ω [9][10][11][12][13]. However, as the impedance transformation ratio becomes larger, loss in the matching network inevitably increases, and it becomes harder to maintain a broad bandwidth.…”

Section: Introductionmentioning

confidence: 99%

VHF/UHF broadband four‐way power combiner/divider using 0° hybrid and impedance transformer based on transmission lines

Lee

Lim

Bae

et al. 2017

IET Microwaves, Antennas & Propagation

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This study presents a broadband four‐way power combiner/divider for very high frequency (VHF) to ultra‐high frequency (UHF) bands using 0∘ hybrids and impedance transformers based on transmission lines. The 0∘ hybrids were used as in‐phase power combiners or dividers, and 1 : 4 impedance transformers were adopted to transform the impedance so that all input and output ports had a 50 Ω impedance. Each component was analysed using equivalent circuits. The overall size of the implemented four‐way power combiner/divider module was 110×163thickmathspacemnormalm2. Based on the measured S‐parameters, an ultra‐broad bandwidth from 8.0 to 600 MHz was achieved with an insertion loss <1.0 dB, reflection coefficients below −10.0 dB, isolation among the ports less than −15.0 dB, and magnitude and phase imbalances less than ±0.1 dB and 0.5∘, respectively.

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Ferrite toroidal core with a trifilar wound RF broadband transformer design for tracking generators in wideband code division multiple access envelope tracking RFPA systems

Yusoff

Lees

Chaudhary

et al. 2016

Journal of Electromagnetic Waves and Applications

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400 W broadband power amplifier using transmission-line transformers with 1:8 impedance transformation ratio

Cited by 7 publications

References 12 publications

Ultrabroadband balun with 1:4 impedance transformation ratio using transmission‐line transformers

Ultrabroadband balun with 1:4 impedance transformation ratio using transmission‐line transformers

VHF/UHF broadband four‐way power combiner/divider using 0° hybrid and impedance transformer based on transmission lines

Ferrite toroidal core with a trifilar wound RF broadband transformer design for tracking generators in wideband code division multiple access envelope tracking RFPA systems

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