A Broadband Quadrature Power Splitter Using Metamaterial Transmission Line

Tseng, Chao‐Hsiung; Chang, Chih-Lin

doi:10.1109/lmwc.2007.911981

Cited by 72 publications

(55 citation statements)

References 8 publications

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“…In recent years, metamaterials(MMs) [1][2][3][4][5]have triggered a notable scientific investigation with an expanding impact on modern optical device due to its unnatural electromagnetic properties, MMs has many applications like perfect filter [6], lens [7], cloaking [8], antenna system [9]etc. It is well known that most of the MMs are periodically arranged with metallic structure that is much smaller than the operating wavelength in size.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, MAs suffer from narrow operating bandwidth as they designed with characteristic of ultrathin and near perfect absorption [13], although some broadband MMs [2][3][4][5]12]have already been presented, it is only limited to absorb microwave with higher frequency or the pattern is too complicated to be produced, and some absorber designs also comprise multiple vertically stacked metallic layers, but the thickness is also a major limitation in those designs, Thus it is a challenge to design a MMs with lower frequency absorption and simpler construction.…”

Section: Introductionmentioning

confidence: 99%

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A Thin, Angle-insensitive, Broadband Microwave Absorber Based on Metamaterial

Zhou¹,

Pan²,

Pan³

2016

Proceedings of the 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics

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Abstract. In this paper, we have presented a simple model for making thin, angle-insensitive, broadband metamaterial absorber in microwave frequency. The proposed structure consists of a square loop imprinted on a aluminum-backed dielectric substrate. Numerical results show that a -10dB absorption bandwidth from 4.77 to 9.52GHz has been realized under normal incidence. The distributions of electromagnetic field have been illustrated at the low-frequency peak of 5.4GHz and high-frequency peak of 8.0GHz to analyze the absorption mechanism of the proposed structure. And we find that the absorption dependent on the thickness of substrate and the length of square loop hugely. Moreover, the magnitude distributions of electric field along the direction of y-axis on proposed absorber has been presented with incident angles ranging from 0 0 to 60 0 . Because rotational symmetric properties of the structure, the performance of the absorber is insensitive to the angle of the incident waves, which indicated the prospect of future application in the field of microwave absorber based on metamaterials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Thin, Angle-insensitive, Broadband Microwave Absorber Based on Metamaterial

Zhou¹,

Pan²,

Pan³

2016

Proceedings of the 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics

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“…In [10], a broadband quadrature power divider with FBW of 104% was developed. The circuit uses the same circuit as [9] however they differ in the design method.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Quadrature Power Divider/Combiner and Its Application to an Improved Balanced Amplifier

Olvera‐Cervantes

Corona‐Chávez²,

Chávez‐Pérez³

et al. 2013

PIER C

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Abstract-In this paper, a novel broadband quadrature power divider and its robust design method are presented. The QPD consists of a two-section power divider in combination with a 90-degree differential phase shifter. The two-section power divider is calculated to provide equal power split, high output port isolation, and good return loss at all three ports. The differential phase shifter consists of a composed right/left handed transmission line and pure-right handed transmission line named CRLHu-TL and PRHd-TL, respectively. The CRLHu-TL is divided into two parts; one of them consists of a pure-left handed section whose parasitic pad effects are represented by means of a pure right handed section named PRHp. On the other hand, the PRHd-TL is composed by a microstrip transmission line of characteristic impedance 50 Ω and electrical length 50 • and two sections equivalents to PRHp. The proposed circuit is applied to develop a broadband balanced amplifier with measured fractional bandwidth (FBW) of 124.4% at the center frequency of 2 GHz.

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“…It has been used for improving the performance of microwave applications by substantially reducing the device size, and enhancing the bandwidth. Applications include the phase shifters [10], couplers [11], power dividers [12], antennas [13], absorbers [14], and resonators [15]. All these concepts contributed towards developing the areas of electromagnetic applications.…”

Section: Background and Motivationmentioning

confidence: 99%

“…By utilizing these artificial structures, several new electromagnetic components have been introduced including photonic band-gap structures [90], leaky-wave antenna [91], resonator [69], splitter [12], coupler [11] and band-pass filter [92]. However, conventional microwave structures feature double stub, triple stub, additional capacitors, incompatible dimensions that degraded the structure's compatibility [93].…”

Section: Overviewmentioning

confidence: 99%

Synthesis and Analysis of Metamaterial Structure for Microwave Frequency Applications

Uddin¹

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produce uncertainty, therefore, most of the conventional extraction technique rely on relatively thin materials. In the thick materials, the ambiguity appears in different frequency points in several branches which produces phase error. Thus, it is essential to check the proper branch that minimizes the ambiguity and this remains under explored. This doctoral research aims to fill this gap in the scholarly literature by developing a unique extraction technique that will support reducing the ambiguity error and is able to provide accurate values for electromagnetic properties. To achieve this aim, the initial research concentrated on the Nicholsonross-weir (NRW) technique. The modified NRW technique is then applied to a long-length Drude material with known parameters for validation. Another extraction technique known as Kramers-Kronig (KK) technique is also investigated. This KK extraction technique is applied to the use of Cauchy residue integrals instead of using trapezoidal rule integration. Further investigations involved experimentation by using the proposed NRW extraction technique to provide empirical evidence, such as designing a periodic dual-star split ring Synthesis and analysis of metamaterial structure for microwave frequency applications iii resonator (DSSRR) and microwave absorber. DSSRR is an electromagnetic band gap (EBG) based metamaterial structure. The proposed DSSRR structure may be implemented with an equivalent transmission line structure. The advantage of the transmission line structure is that it realizes the artificial structure with minimum losses and produce wide bandwidth. The DSSRR structure is implemented on single unit cells and multiple unit cells. The proposed DSSRR structure delivers a wide-band performance from 7.5 GHz to 9.5 GHz and a maximum rejection up to 47 dB, which offer a sharp cut-off in the reject band. The dispersion diagram exhibits unusual characteristics in both balanced and unbalanced conditions. A microwave absorber was also developed. The proposed design offers three unique shapes without using any additional resistive sheets on top of the ground plane.The three unique shapes are octagonal ring, (OR), cross-wires (CWs), and cut-off circle (CC). The proposed shapes are insensitive to polarization angle, and can achieve perfect absorption. Further work involves the successful extraction of electromagnetic properties using the NRW technique. The numerical and experimental results agree with each other, which further confirms the metamaterial behaviour.iv Synthesis and analysis of metamaterial structure for microwave frequency applications

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A Broadband Quadrature Power Splitter Using Metamaterial Transmission Line

Cited by 72 publications

References 8 publications

A Thin, Angle-insensitive, Broadband Microwave Absorber Based on Metamaterial

A Thin, Angle-insensitive, Broadband Microwave Absorber Based on Metamaterial

A Wideband Quadrature Power Divider/Combiner and Its Application to an Improved Balanced Amplifier

Synthesis and Analysis of Metamaterial Structure for Microwave Frequency Applications

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