Combined Left- and Right-Handed Tunable Transmission Lines With Tunable Passband and 0$^{\circ}$ Phase Shift

Kim, Hongjoon; Ho, Sung‐Jin; Choi, Moon; Kozyrev, Alexander B.; Weide, Daniel W. van der

doi:10.1109/tmtt.2006.885884

Cited by 38 publications

(16 citation statements)

References 19 publications

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“…When several identical RHTL sections are cascaded, a periodic cutoff frequency appears (the Bragg cutoff frequency), which can be calculated as follows [3] …”

Section: Synthetic Rhtl and Lhtl Theorymentioning

confidence: 99%

“…This implies that phase propagation is in the direction opposite to that of the Poynting vector [3,4].…”

Section: Synthetic Rhtl and Lhtl Theorymentioning

confidence: 99%

“…Recently, the microwave applications of left-handed transmission lines (LHTLs) have attracted wide attention [2][3][4][5][6][7][8]. Unlike conventional right-handed transmission lines (RHTLs), LHTLs show negative phase propagation, which is a property of metamaterials.…”

Section: Introductionmentioning

confidence: 99%

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Considerable Size Reduction of Dipole Antenna with a Compact and Broadband Balun

Han¹,

Kim²,

Kim³

2016

Journal of Electrical Engineering and Technology

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-A compact and broadband balun is designed using a conventional right-handed transmission line (RHTL) and a left-handed transmission line (LHTL) with lumped elements only. The proposed balun maintains a phase difference of 180° ± 12° at the output ports for the frequency range of 1.27 GHz-2.69 GHz. Nevertheless, the circuit size is merely 9.5 mm × 12.7 mm. To verify the performance of the proposed balun, we attached it to a dipole-type antenna and observed that the return loss is greater than 10 dB for the frequency range between 1.86 GHz and 2.57 GHz. The radiation pattern and peak gain are similar to those of the dipole antenna with a conventional balun.

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“…When several identical RHTL sections are cascaded, a periodic cutoff frequency appears (the Bragg cutoff frequency), which can be calculated as follows [3] …”

Section: Synthetic Rhtl and Lhtl Theorymentioning

confidence: 99%

“…This implies that phase propagation is in the direction opposite to that of the Poynting vector [3,4].…”

Section: Synthetic Rhtl and Lhtl Theorymentioning

confidence: 99%

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Considerable Size Reduction of Dipole Antenna with a Compact and Broadband Balun

Han¹,

Kim²,

Kim³

2016

Journal of Electrical Engineering and Technology

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“…By replacing a long transmission line with a lumped element inductor and varactor, a compact NLTL could be constructed [11,12]. The main idea of this article is to replace the k/4 sections of the conventional Wilkinson power divider with the lumped-element NLTLs to minimize size and have frequency tunability.…”

Section: Introductionmentioning

confidence: 99%

Compact, tunable Wilkinson power divider using tunable synthetic transmission line

Tang

Ryu

Kim

2010

Micro & Optical Tech Letters

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A very compact and frequency tunable Wilkinson power divider is suggested and demonstrated for the first time. By replacing k/ 4 section lines in a conventional Wilkinson power divider with varactor tunable, lumped-element synthetic transmission lines, dramatical size reduction and frequency tunability has been achieved. The prototype circuit fabricated shows excellent performance. For tunable frequencies from 0.71 to 0.99 GHz, the insertion loss is less than 3.52 dB, whereas the return loss and isolation are greater than 20 dB. Yet, the size of this voltage controllable Wilkinson power divider is only 4 mm by 8 mm, which occupies less than 3% area of original Wilkinson power divider structure.

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“…Recently, much attention has been paid to left-handed transmission line (LHTL) [4,5]. Due to its negative phase propagation constant, the LHTLs can be used in the ring hybrids to reduce the circuit size significantly.…”

mentioning

confidence: 99%

Compact and broadband tunable hybrid ring coupler using synthetic left‐ and right‐handed transmission lines

Kim

2011

Micro & Optical Tech Letters

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In this letter, we present a frequency tunable hybrid ring coupler based on the concepts of a synthetic left‐ and right‐handed transmission line.The proposed ring coupler makes use of lumped inductor‐capacitor (LC) elements to greatly reduce the circuit size; meanwhile, the frequency responses of the coupler can be tuned by direct current (DC) bias voltages. The fabricated hybrid ring coupler shows a wideband performance with an insertion loss of less than 2.5 dB from 1.7 to 3.3 GHz. For this frequency band, the isolation is maintained at more than 24 dB. When the circuit is excited to get a pair of differential signal, less than ±5° phase error is observed for the whole frequency range. This hybrid has a 78% size reduction compared to the conventional ones and achieved a 64% of fractional bandwidth at 2.5 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1379–1382, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25959

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Combined Left- and Right-Handed Tunable Transmission Lines With Tunable Passband and 0$^{\circ}$ Phase Shift

Cited by 38 publications

References 19 publications

Considerable Size Reduction of Dipole Antenna with a Compact and Broadband Balun

Considerable Size Reduction of Dipole Antenna with a Compact and Broadband Balun

Compact, tunable Wilkinson power divider using tunable synthetic transmission line

Compact and broadband tunable hybrid ring coupler using synthetic left‐ and right‐handed transmission lines

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