Wideband Single-Layer 90$^{\circ}$ Phase Shifter Using Stepped Impedance Open Stub and Coupled-Line With Weak Coupling

This paper proposes a novel wideband 90[Formula: see text] phase shifter, which comprises a radial stub, a uniform transmission line, and a weak coupled-line (coupling coefficient [Formula: see text] dB). The circuit configuration and theoretical analysis equations of the phase shifter are presented. Results demonstrate that the bandwidth (BW) with acceptable phase deviation can be obviously improved by increasing the spanning angle of the radial-stub and the coupling strength of the coupled-line. For return loss better than 10 dB, insertion loss less than 1.05 dB, and phase deviation of [Formula: see text] 8.5[Formula: see text], the fabricated microstrip single-layer phase shifter exhibits BW of 118% from 0.65 GHz to 2.51 GHz. Compared with existing structures, the proposed phase shifter not only has the largest BW but also features simple structure, low-cost, convenient installation, and good portability.

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Designing of Miniaturized 4 × 4 Butler Matrix Using Coupled Line Coupler and Schiffman Phase Shifter

Iranian Journal of Science and Technology Transactions of Electrical Engineering ◽

10.1007/s40998-020-00350-4 ◽

2020 ◽

Author(s):

Partha Kumar Deb ◽

Tamasi Moyra ◽

Bidyut Kumar Bhattacharyya

Keyword(s):

Phase Shifter ◽

Coupled Line ◽

Butler Matrix

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Single-layer coupled-line magic-Ts utilizing left-handed transmission line sections

2014 20th International Conference on Microwaves, Radar and Wireless Communications (MIKON) ◽

10.1109/mikon.2014.6899853 ◽

2014 ◽

Author(s):

Jakub Sorocki ◽

Ilona Piekarz ◽

Izabela Slomian ◽

Slawomir Gruszczynski ◽

Krzysztof Wincza

Keyword(s):

Transmission Line ◽

Single Layer ◽

Coupled Line ◽

Left Handed

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Thermal Conductivity Reduction in Few-Layer Graphene

ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems, MEMS and NEMS: Volume 1 ◽

10.1115/ipack2011-52245 ◽

2011 ◽

Author(s):

Dhruv Singh ◽

Jayathi Y. Murthy ◽

Timothy S. Fisher

Keyword(s):

Thermal Conductivity ◽

Weak Coupling ◽

Phonon Scattering ◽

Single Layer ◽

Acoustic Mode ◽

Single Layer Graphene ◽

Boltzmann Transport ◽

Layer Graphene ◽

Out Of Plane ◽

Few Layer Graphene

Using the linearized Boltzmann transport equation and perturbation theory, we analyze the reduction in the intrinsic thermal conductivity of few-layer graphene sheets accounting for all possible three-phonon scattering events. Even with weak coupling between layers, a significant reduction in the thermal conductivity of the out-of-plane acoustic modes is apparent. The main effect of this weak coupling is to open many new three-phonon scattering channels that are otherwise absent in graphene. The highly restrictive selection rule that leads to a high thermal conductivity of ZA phonons in single-layer graphene is only weakly broken with the addition of multiple layers, and ZA phonons still dominate thermal conductivity. We also find that the decrease in thermal conductivity is mainly caused by decreased contributions of the higher-order overtones of the fundamental out-of-plane acoustic mode. Moreover, the extent of reduction is largest when going from single to bilayer graphene and saturates for four layers. The results compare remarkably well over the entire temperature range with measurements of of graphene and graphite.

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A MODIFIED COUPLED-LINE SCHIFFMAN PHASE SHIFTER WITH SHORT REFERENCE LINE

Progress In Electromagnetics Research C ◽

10.2528/pierc14063003 ◽

2014 ◽

Vol 54 ◽

pp. 17-27 ◽

Cited By ~ 6

Author(s):

Weiwei Zhang ◽

Yuanan Liu ◽

Yongle Wu ◽

Weimin Wang ◽

Ming Su ◽

...

Keyword(s):

Phase Shifter ◽

Reference Line ◽

Coupled Line

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A Compact Single-Layer Balanced Phase Shifter With Wide Bandwidth and Uniform Reference Line

IEEE Access ◽

10.1109/access.2020.2976730 ◽

2020 ◽

Vol 8 ◽

pp. 41530-41536

Author(s):

Wei Zhang ◽

Kai Xu ◽

Jin Shi ◽

Zhidan Shen

Keyword(s):

Phase Shifter ◽

Single Layer ◽

Reference Line ◽

Wide Bandwidth

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Single-layer dual-band terahertz filter with weak coupling between two neighboring cross slots

Chinese Physics B ◽

10.1088/1674-1056/24/10/107802 ◽

2015 ◽

Vol 24 (10) ◽

pp. 107802 ◽

Cited By ~ 2

Author(s):

Li-Mei Qi ◽

Chao Li ◽

Guang-You Fang ◽

Shi-Chao Li

Keyword(s):

Weak Coupling ◽

Single Layer ◽

Dual Band ◽

Terahertz Filter

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A New Design of Ultrawideband Single-Layer 90° Phase Shifter in the View of Group Delay

IEEE Microwave and Wireless Components Letters ◽

10.1109/lmwc.2019.2912031 ◽

2019 ◽

Vol 29 (6) ◽

pp. 376-378 ◽

Cited By ~ 5

Author(s):

Yun-Peng Lyu ◽

Lei Zhu ◽

Chong-Hu Cheng

Keyword(s):

Phase Shifter ◽

Group Delay ◽

Single Layer

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COMPACT WILKINSON PASS-BAND FILTERING POWER DIVIDER BASED ON QUARTER-WAVELENGTH SIDE-COUPLED RING

Journal of Circuits System and Computers ◽

10.1142/s0218126614501357 ◽

2014 ◽

Vol 23 (10) ◽

pp. 1450135

Author(s):

YONGLE WU ◽

QIANG LIU ◽

JUNYU SHEN ◽

YUANAN LIU

Keyword(s):

Low Cost ◽

Single Layer ◽

Power Divider ◽

Pass Band ◽

Fractional Bandwidth ◽

Coupled Line ◽

Quarter Wavelength ◽

Wilkinson Power Divider ◽

Isolation Performance ◽

Wavelength Side

A Wilkinson power divider with improved bandpass filtering and high isolation performance is proposed. These characteristics are achieved by replacing the quarter-wavelength transmission line in the conventional coupled line Wilkinson power divider with quarter-wavelength side-coupled ring (QSCR). Additional features such as DC blocking between arbitrary two ports, single-layer via-less structure for low-cost fabrication and convenient integration (as only one isolation resistor required) are highlighted. A 2-GHz Wilkinson microstrip power divider with a fractional bandwidth of 4% has been fabricated and experimentally characterized. The consistency between simulated and measured results validates the effectiveness of our proposed design.

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