Calculation of tightly coupled transmission lines for MMIC/MHMIC technology

1998 ◽  
Vol 34 (14) ◽  
pp. 1407
Author(s):  
Yansheng Xu ◽  
R.G. Bosisio
Keyword(s):  
Transmission Lines ◽  
Tightly Coupled ◽  
Coupled Transmission Lines

Crosstalk reduction using novel cross-shaped resonators with via fence in high-frequency transmission lines

Circuit World ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yokesh V. ◽  
Gulam Nabi Alsath Mohammed ◽  
Malathi Kanagasabai
Keyword(s):  
Transmission Lines ◽  
High Frequency ◽  
High Speed ◽  
Cell Structure ◽  
Frequency Domain Analysis ◽  
Content Type ◽  
High Frequencies ◽  
Tightly Coupled ◽  
Novel Method ◽  
Coupled Transmission Lines

Purpose The purpose of this paper is to design a suitable guard trace to reduce the electromagentic interference between two closely spaced high frequency transmission lines. A novel cross-shaped resonator combined via fence is passed down to alleviate far-end and near-end crosstalk (NEXT) in tightly coupled high-speed transmission lines. The distance between the adjacent transmission lines is increased stepwise as a function of trace width. Design/methodology/approach A rectangular-shaped resonator via fence is connected by a guard trace has been proposed to overcome the coupling between the traces that is separated by 2 W. Similarly, by creating a cross-shaped resonator via fence connected by guard trace that reduces the spacing further by 1.5 W. Findings A tightly coupled transmission line structure that needs separation by a designed unit cell structure. Further research needs to be conducted to improve the NEXT, far-end crosstalk (FEXT) and spacing between the transmission lines. Originality/value This study portrays a novel method that combines the resonators via fence with a minimum spacing between the tightly coupled transmission lines which reduce the NEXT and FEXT; thereby reducing the size of the routing area. The resultant test structures are characterized at high frequencies using time domain and frequency domain analysis. The following scattering parameters such as insertion loss, NEXT and FEXT of the proposed method are measured as 1.504 dB, >30 dB and >20 dB, respectively.

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