Design of Composite Right/Left-Handed Coplanar-Waveguide Bandpass and Dual-Passband Filters

Mao, Shau‐Gang; Wu, Min-Sou; Chueh, Yu-Zhi

doi:10.1109/tmtt.2006.880652

Cited by 23 publications

(14 citation statements)

References 27 publications

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“…When operating in left-handed region of a CRLH structure, the anti-parallelism exists between the phase and group velocities so that the CRLH CPW short-circuited stub corresponds to the shunt circuit near the resonant frequency and its size is smaller than the conventional quarter-wavelength shortcircuited stub [6]. Moreover, compared with the CRLH structure using multiple CRLH cells [8], this CRLH CPW short-circuited stub utilizes only one single CRLH cell, consisting of the interdigital capacitor and meander-line inductor, to provide the phase-advanced property that CRLH CPW stub required.…”

Section: Periodic Bandpass and Bandstop Structuresmentioning

confidence: 99%

“…In contrast to the dual-passband filter implemented by cascading the bandpass and bandstop filters [5], this proposed filter is realized by Manuscript combining a wide bandpass filter (BPF) with a narrow bandstop filter (BSF) in parallel and hence the extra connecting networks can be eliminated. The BPF is comprised of periodic CRLH CPW short-circuited stubs equivalent to the shunt resonators [6]. The quarter-wavelength open-circuited stubs are used to realize BSF.…”

mentioning

confidence: 99%

“…Then the dual-passband filter can be obtained by shunt connecting the bandpass and bandstop filters. Compared with the dual-passband filter using symmetric CRLH stubs [6], this proposed filter periodically incorporating the CRLH stubs with quarter-wavelength stubs in asymmetric configuration is more compact in size, and it is easier to control the dual-passband characteristics by varying the dimensions of BPF and BSF independently. The analysis of dual-passband filters is developed by using Floquet's theorem to model electromagnetic fields within the unit cell of periodic CRLH and quarter-wavelength stubs.…”

mentioning

confidence: 99%

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Asymmetric Dual-Passband Coplanar Waveguide Filters Using Periodic Composite Right/Left-Handed and Quarter-Wavelength Stubs

Mao

Chueh

2007

IEEE Microw. Wireless Compon. Lett.

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A novel dual-passband coplanar waveguide (CPW) filter periodically loaded with the composite right/left-handed (CRLH) short-circuited stubs and the quarter-wavelength open-circuited stubs in asymmetric configuration is presented. The unit-cell equivalent circuit of the periodic structure in conjunction with Floquet's theorem is employed to find the propagation characteristics of passband and stopband regions. Unlike the conventional quarter-wavelength transmission-line inverter suitable only for a narrow frequency range, the dual-band inverter is adopted in the dual-passband filter to achieve a better frequency response within two operating bands. The performance of the 2.4/5.8-GHz third-order CRLH CPW dual-passband filter with 52% and 23% bandwidths is measured and validated by full-wave simulation. Two arbitrary passband regions are presented and the stopband within the passbands can be controlled by varying the length of open-circuited stub, supporting the flexibility and compactness of the proposed dual-passband filter.Index Terms-Composite right/left-handed (CRLH) coplanar waveguide (CPW), dual-passband filter, periodic structure.

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Section: Periodic Bandpass and Bandstop Structuresmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Asymmetric Dual-Passband Coplanar Waveguide Filters Using Periodic Composite Right/Left-Handed and Quarter-Wavelength Stubs

Mao

Chueh

2007

IEEE Microw. Wireless Compon. Lett.

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“…Recently, the left-handed (LH) material implemented by using the planar transmission-line (TL) approach has been widely studied. Numerous of researches focused on the applications of the left-handed transmission line (LH-TL) with the slow-wave factor over 5, making the circuit miniaturization [2]- [4]. For examples, the diplexer and triplexer in [2] are 50% and 76% smaller than the conventional designs, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The couplers in [3] achieve area reduction of 43.7% and increased the operating bandwidth. The bandpass filter in [4] achieves 62.5% area reduction.…”

Section: Introductionmentioning

confidence: 99%

Leakage of CMOS slow-wave left-handed transmission line on the perforated ground plane

Tzuang

2014

2014 IEEE International Wireless Symposium (IWS 2014)

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This paper presents the leakage phenomenon of the left-handed transmission line (LH-TL) in the slowwave region. The 15 μm unit-cell of the LH-TL is implemented based on the 0.13 μm 1P8M CMOS technology. The dispersion curves extracted by the measured scattering parameters show that the increasing of the normalized attenuation constant (α/β 0 ) above 320 GHz indicates the transverse electric (TE)-like leakage phenomenon of the proposed LH-TL in the slow-wave region. The theoretical observations based on the three-dimensional electromagnetic field analyses confirmed the leakage phenomenon.

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Microwave Metamaterial Circuits

Vendik

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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Electromagnetic metamaterials are usually defined as artificial effectively homogeneous structures with specific properties, that cannot be observed in natural materials. Different approaches are used for a description of the fundamental electromagnetic properties of metamaterials and the practical realization of these materials as well. Among them, the transmission line (TL) approach gives an efficient design tool for microwave applications. A conventional TL with the positive phase velocity behaves as a right‐handed transmission line (RH TL). An artificial RH TL is formed as a ladder network of capacitors connected in shunt and series inductors. The dual transmission line is designed as a ladder network of inductors connected in shunt and series capacitors. This line has the negative phase velocity and is referred to as the left‐handed transmission line (LH TL). A backward wave propagates along the LH TL, which can be considered as the one‐dimensional metamaterial. A more general model of an LH TL is the composite right/left handed (CRLH) structure. Many interesting features can be observed when a combination of RH TL and LH TL is used. The most important feature of the LH and RH TLs is that their dispersion characteristics are described by different equations. That can be used for many beneficial applications. Different combinations of LH and RH TLs are used for a design of miniature microwave devices with improved performance and enlarged functionality. Among them are microwave resonators and filters, microwave power divider/combiners, and microwave phase shifters. Multiband devices and tunable and reconfigurable microwave circuits are also under consideration.

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Design of Composite Right/Left-Handed Coplanar-Waveguide Bandpass and Dual-Passband Filters

Cited by 23 publications

References 27 publications

Asymmetric Dual-Passband Coplanar Waveguide Filters Using Periodic Composite Right/Left-Handed and Quarter-Wavelength Stubs

Asymmetric Dual-Passband Coplanar Waveguide Filters Using Periodic Composite Right/Left-Handed and Quarter-Wavelength Stubs

Leakage of CMOS slow-wave left-handed transmission line on the perforated ground plane

Microwave Metamaterial Circuits

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