Low Spurious, Broadband Frequency Translator Using Left-Handed Nonlinear Transmission Line

Tang, Wenjia; Kim, Hongjoon

doi:10.1109/lmwc.2009.2015502

IEEE Microw. Wireless Compon. Lett.

2009

DOI: 10.1109/lmwc.2009.2015502

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Low Spurious, Broadband Frequency Translator Using Left-Handed Nonlinear Transmission Line

Wenjia Tang

Hongjoon Kim

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Cited by 7 publications

(1 citation statement)

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“…Non-linear metamaterials, especially non-linear composite rightleft-handed transmission lines (CRLHTLs), have been attracting much attention and studied in the compact resonator, filter and leak wave antenna [6][7][8], owing to its advantages on compact size, low loss and easy integration. The transmission parameters of the non-linear CRLHTL can vary with the input power or bias voltage.…”

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Analogue predistorter based on non‐linear CRLHTL

Deng¹,

Zhou²,

Zhang³

et al. 2018

Electron. lett.

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A low insertion loss (IL) analogue predistorter using non-linear composite right-left-handed transmission line (CRLHTL) is presented. The proposed predistorter consists of two symmetrical CRLHTL unit cells. In the experiment, this predistorter can achieve about 2.2 dB gain expansion and 17°phase shift during 4.4-4.5 GHz with only 4.3 dB IL. A C-band 40 W solid-state power amplifier observes 8.1 dB enhancement in the intermodulation at −6 dB output power backoff when linearised by the proposed predistorter.

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mentioning

confidence: 99%

Analogue predistorter based on non‐linear CRLHTL

Deng¹,

Zhou²,

Zhang³

et al. 2018

Electron. lett.

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Broadband balun for monolithic microwave integrated circuit application

Yoo

Lee

Kim

2011

Micro & Optical Tech Letters

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We present a compact and broadband balun based on the concept of a synthetic left-handed transmission line and right-handed transmission line. The compact balun uses lumped, discrete LC elements only to reduce the circuit size dramatically. For the frequency range of 0.6-1.2 GHz, this circuit maintains 180 6 9.5 phase difference at the outputs, whereas the maximum insertion loss is À1.78 dB, and the minimum return loss is À10.2 dB at all three ports, yet the circuit size is merely 12 Â 8 mm 2 . As far as we know, this is the smallest broadband balun reported in the literature, and the size can be further reduced, if the circuit is made with a monolithic microwave integrated circuit technology.ABSTRACT: This article describes the design, realization, and characterization of a set of hybrid medium-power RF power amplifiers, based on a commercial packaged GaN HEMT and developed through a low-cost microstrip process. Two different design solutions suitable for wireless applications are presented: the first, intended for a constant envelope modulation (with reference to the GSM standard) is a Class F amplifier exhibiting at 900 MHz an efficiency of 72% with an output power of 37.5 dBm; the second, optimized for nonconstant envelope signals with high dynamics (with reference to the UMTS WCDMA standard) is a Doherty amplifier showing, at 2.14 GHz, an efficiency higher than 40% at 6 dB of output power back-off with a maximum output power of 40 dBm.

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Compact and low-cost reflectometer using a LH-NLTL frequency translator

Park

Kim

2017

Microw. Opt. Technol. Lett.

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In this study, we fabricated a low‐cost, miniaturized reflectometry system using a left‐handed nonlinear transmission line (LH‐NLTL) and compared its performance with that of a commercial vector network analyzer (VNA). In the system, we used the LH‐NLTL as a frequency translator to replace a bulky and expensive frequency synthesizer. In addition, instead of using a bulky broadband coupler, we used a compact resistive coupler to minimize the size of the overall system. To improve system accuracy, we employed a four‐port network calibration equation. The resulting system exhibits highly similar performance compared to a commercial VNA. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:873–876, 2017

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Low Spurious, Broadband Frequency Translator Using Left-Handed Nonlinear Transmission Line

Cited by 7 publications

References 7 publications

Analogue predistorter based on non‐linear CRLHTL

Analogue predistorter based on non‐linear CRLHTL

Broadband balun for monolithic microwave integrated circuit application

Compact and low-cost reflectometer using a LH-NLTL frequency translator

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