An Application of the Subwavelength Periodic Microstrip Guard Trace in High-Speed Circuits

Wu, Chia Ho; Ma, Peixun; Zhou, Guobing; Shen, Jing; Qian, Zhenyu; Shen, Linfang; Zhang, Hang; Wang, Zhuoyuan; Wang, Xiaolong; He, Fang

doi:10.1109/access.2022.3168679

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…PCB design engineers reduce areas of circuit boards with various periodically distributed serpentine delay lines [11], [12]. In addition, periodic serpentine lines or periodic microstrip lines can be introduced between two parallel microstrip lines to block electromagnetic interference between two signal traces [13]- [15]. Recent studies have found that periodic structures etched on metal surfaces lead to new guided-wave modes [16], [17].…”

Section: Introductionmentioning

confidence: 99%

A Direct Near-Field Observation of Conversion Between Waveguide Modes and Leaky Modes in Periodic Metal Structures

Qian

Wang

et al. 2023

IEEE Access

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In order to directly observe the conversion between guided-wave modes and leaky-wave modes in a periodic structure, quadrilateral periodic metal diaphragms arranged in two ways on metal surfaces were analyzed. In the first scheme, each unit cell in the periodic structure contains a metal diaphragm, of which the dispersion characteristics of periodic structures were analyzed by the finite element method. The results of the numerical show that by adjusting lattice constants of periodic structures and geometrical parameters of metal diaphragms, the transmission bandwidth of the present 1-D periodic metal diaphragm structures could be limited to X-band, where the transmission characteristics are easy to be measured. In the second scheme, a pair of mirror-symmetric and staggered quadrilateral metal diaphragms is introduced into a unit cell. It can be found in the theoretical calculation that a new dispersion curve, which passes through the light line in a high frequency range, can be exhibited. The propagation constants of dispersion curves become complex numbers and provide highly directional electromagnetic radiation that scans as the frequency changes. After the relative positions of the two metal diaphragms were properly adjusted, the frequency range of the forbidden band gap between two dispersion curves can be minimized, so as to increase the transmission bandwidth of the 1-D periodic metal structures. The experimentally measured show that the dispersion curves of the two periodic structures were highly consistent with the theoretical results. The narrowing of the band gap could be verified by measuring the S-parameters. The near-field measurement of the periodic metal structures can demonstrate the conversion between the guided-wave modes and the leaky-wave modes, and the far-field measurement can show the frequency dependence of beam elevation. We expect that these artificial material structures could be widely used for designing new microwave and terahertz band devices. INDEX TERMS periodic metal structures, leaky mode, transmission lines

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Section: Introductionmentioning

confidence: 99%

A Direct Near-Field Observation of Conversion Between Waveguide Modes and Leaky Modes in Periodic Metal Structures

Qian

Wang

et al. 2023

IEEE Access

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“…Cai et al added graphene paraffin material to the signal line with labels to suppress FEXT [10] and increased the cost of batch production. Ma et al proposed a kind of guard trace based on a subwavelength periodic structure to reduce the FEXT of parallel microstrip lines [11] and limit the high-density layout. In 2015, Intel Corporation proposed a non-uniform transmission line that can reduce crosstalk and meet the requirements of high-speed and high-density integration.…”

Section: Introductionmentioning

confidence: 99%

Design of T-shaped non-uniform microstrip lines for reducing crosstalk in high-speed PCBs

Dong,

Duan,

Xie

2023

J. Phys.: Conf. Ser.

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High-speed and high-density PCB circuit layout design faces serious signal integrity problems. Crosstalk is one of the key problems affecting signal quality. Periodic non-uniform differential microstrip lines have the possibility of reducing crosstalk. This paper proposes a T-shaped non-uniform microstrip line, which adds the T-shaped bump on the inner side of the parallel microstrip lines. The microstrip line adopts the minimum batch production process linewidth to maintain high density, which is suitable for occasions where the line spacing is three times the linewidth. The principle of crosstalk mitigation for T-shaped microstrip lines is explained, and the evolution process of T-shaped microstrip lines is given, compared with parallel microstrip lines and tabbed lines with the same density. The simulation resulting in the time domain and frequency domain shows that the transmission performance of the T-shaped microstrip line is good, and crosstalk can be effectively suppressed in a high-frequency band, even better in some specific frequencies due to the crosstalk fluctuation with frequency.

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“…Several new circuit structures and circuit models that may use SPMLs to suppress the crosstalk between adjacent microstrip lines have been suggested [29][30][31]. Since the electromagnetic coupling between CML and SPML is very weak, if SPMLs were used as the guard traces of high speed circuits, the total number of grounded holes of the guard traces can be significantly reduced [32] and this does not affect the wiring of other layers in circuit boards.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electromagnetic interaction between smooth and corrugated transmission lines by using a circuit model

Zhou

et al. 2022

IET Microwaves Antenna & Prop

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It has been proved that a subwavelength periodic microstrip structure can be used to suppress crosstalk between two adjacent microstrip lines and such a microstrip structure can be widely used in the application of high‐speed circuit systems. To further increase the accuracy of the equivalent circuit model of the subwavelength periodic microstrip line (SPML), we focus our attention on a single unit cell with the periodic structure, which is divided into several sub‐regions, and the circuit parameters in each sub‐region are analysed for setting up a complete circuit model of the unit cells. Then the details of the interaction between each sub‐region and the electromagnetic field are clearly indicated. The S $S$‐parameters of the circuit model accord well with full‐wave simulation results, showing a maximum deviation of 0.03973 dB for S21 and 0.1211 dB for S11 below 15 GHz. For the first time, we also study the frequency‐dependence of the mutual capacitance and the mutual inductance for analysing the coupling effect between an SPML and a conventional microstrip line (CML). The instantaneous impedance obtained by the full‐wave simulation of the SPML is consistent well with the experimental results.

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An Application of the Subwavelength Periodic Microstrip Guard Trace in High-Speed Circuits

Cited by 8 publications

References 24 publications

A Direct Near-Field Observation of Conversion Between Waveguide Modes and Leaky Modes in Periodic Metal Structures

A Direct Near-Field Observation of Conversion Between Waveguide Modes and Leaky Modes in Periodic Metal Structures

Design of T-shaped non-uniform microstrip lines for reducing crosstalk in high-speed PCBs

Analysis of electromagnetic interaction between smooth and corrugated transmission lines by using a circuit model

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