High Directivity Directional Coupler using Metamaterial

Chun, Young-Hoon

doi:10.1109/eumc.2006.281323

Cited by 15 publications

(13 citation statements)

References 8 publications

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“…To couple power in specific branch and for precise transmit power monitoring, the directivity and insertion loss (IL) are the two most important performance parameters of any coupler. For enhancement of the directivity, various methods such as using reactive loading methods [20][21][22][23][24], reflected power cancellation [25][26][27], spur-line utilization, metamaterial [28], negative refractive index line [34], etc. have been reported.…”

Section: Resultsmentioning

confidence: 99%

Directivity Enhancement of Miniaturized Directional Coupler using Defected Ground Structure

Bhakhar¹,

Dwivedi²,

Prajapati³

2017

Proceedings of the International Conference on Communication and Signal Processing 2016 (ICCASP 2016)

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Abstract. This research paper investigates about the novel approach in the design and analysis of Couplers operating at 5 GHz, which finds its application for next generation communication systems. The concept of Defected Ground Structure (DGS) in the design of planar coupler is useful for next generation communication systems. The Planar Coupler with an embedded DGS structure is designed for an operating frequency 5 GHz. A convention allow profile planar coupler with an embedded a head dumbbell shaped DGS structure operating at 5 GHz was designed independently and integrated embedded with resonating DGS. The analysis is carried out by varying the dimensions of the DGS. Various electrical performance parameters like transmission coefficient, return loss, coupling factor and isolation have been analytically observed and reproduced for aspirant researchers and designers. The integration of this electromagnetically coupled DGS resulted into significant volumetric reduction of the directional coupler. Incorporating one circular head dumbbell shape reduces the size of ground plane up to 31% while we achieved reduction of 12% in strip-length in comparison to the equivalent conventional coupler. In addition, we found an increase of 127.27% in its directivity compared to conventional counterpart. The effects of variations of DGS dimensions on scattering parameters of this coupler have shown appreciable enhancement. This coupler helps as an inspiration, encouragement and motivation for saving the materials used in designing it, reduces the electrical and RF losses converted into heat and thus a journey towards go-green-earth!

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Section: Resultsmentioning

confidence: 99%

Directivity Enhancement of Miniaturized Directional Coupler using Defected Ground Structure

Bhakhar¹,

Dwivedi²,

Prajapati³

2017

Proceedings of the International Conference on Communication and Signal Processing 2016 (ICCASP 2016)

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“…Some of these methods are not easy to fabricate [10]- [12], [17], [18] and some of them do not have closed-form design equations [11]- [14]. The lumped-element compensation method leads to broad directivity bandwidth, but the parasitic effects of lumped elements affect the coupler performance at high frequencies [2]- [7].…”

Section: Introductionmentioning

confidence: 97%

“…For increasing the directivity of a parallel coupled line coupler, several methods have been introduced in the literature, which include lumped-element compensation [2]- [7], modifying parallel coupled line structure [8]- [11], using multilayer microstrip configuration [12], using the negative refractive index line [13], [14], and directivity enhancement using inductor or capacitor loading [15]- [18]. Some of these methods are not easy to fabricate [10]- [12], [17], [18] and some of them do not have closed-form design equations [11]- [14].…”

Section: Introductionmentioning

confidence: 99%

A Directivity-Enhanced Directional Coupler Using Epsilon Negative Transmission Line

Pourzadi

Attari

Majedi

2012

IEEE Trans. Microwave Theory Techn.

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In this paper, a high directivity parallel coupled line coupler using the negative (ENG) transmission line is proposed. With the aid of even-and odd-mode analysis, it is shown that by using ENG transmission lines in a parallel coupled line coupler, the even-and odd-mode phase velocities can become equal at a desired frequency. Hence, the directivity of a coupler can be infinite theoretically. The coupler circuit model and closed-form relations for lumped elements of this model are presented. In addition, a design procedure for microstrip implementation of this coupler is proposed. Based on the proposed procedure, a 10-dB ENG directional coupler is designed at 2 GHz and validated by full-wave simulations. This coupler is fabricated and measurement results are presented. Experimental results show maximum directivity of nearly 40 dB at 1.95 GHz.

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“…In addition, the compensation is effective by adding a lumped capacitor or inductor at the end or center of the coupled line to increase the directivity but seems to decrease the overall bandwidth of the coupler [7]. Moreover, numerous design techniques and circuit implementations had also been reported and demonstrated for the desired circuit requirements by adding coupled spurlines [8]; a feedforward compensation technique [9]; asymmetrical delay lines [10], [11]; and using the periodic sequence of floating metal strips in the slots on the inner edges [12]. These techniques require nonstandard fabrication for realizing the dielectric overlay.…”

Section: Introductionmentioning

confidence: 99%

Artificial-Synthesized Edge-Coupled Transmission Lines for Compact CMOS Directional Coupler Designs

Chiang

Tzuang

2009

IEEE Trans. Microwave Theory Techn.

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This paper presents artificial-synthesized edgecoupled transmission lines (TLs) based on complementary metaloxide semiconductor (CMOS) technology. The artificial coupledline (CL), the so-called the complementary-conducting-strip coupled line (CCS CL), consists of the unit cell and is meandered in the 2-D plane. The unit cell, whose dimensions are much smaller than the guiding wavelength at the operating frequency, provides five structural parameters for CL syntheses. The synthesized CLs, which are fully characterized by using theoretical and experimental procedures, reveal the following unique guiding properties. First, the coupling coefficient ( ) can be 7.7% higher than that of the meandered conventional edged-coupled TLs. Second, the evenand odd-mode propagation constants can be synthesized as identical at the same time. Two backward-wave directional couplers for achieving the tight coupling and high directivity are designed by incorporating artificial CCS CL. Two prototypes are fabricated by the standard 0.18-m CMOS technology, occupying the chip areas of 120.0 m 240.0 m. The measured results show that the isolation is higher than 25.0 dB from 10.0 to 40.0 GHz with a coupling of 14.4 dB. On the tight coupler design, the through and coupling are 4.65 0.15 dB from 30.0 to 40.0 GHz with an amplitude imbalance of less than 0.3 dB.

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High Directivity Directional Coupler using Metamaterial

Cited by 15 publications

References 8 publications

Directivity Enhancement of Miniaturized Directional Coupler using Defected Ground Structure

Directivity Enhancement of Miniaturized Directional Coupler using Defected Ground Structure

A Directivity-Enhanced Directional Coupler Using Epsilon Negative Transmission Line

Artificial-Synthesized Edge-Coupled Transmission Lines for Compact CMOS Directional Coupler Designs

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