NGD Analysis of 10-Line Microstrip Structure Crosstalk

An analysis of coupling effect between "1" and "0" shape lines is studied in this paper. After the "10" structure description, the two-port equivalent circuit is introduced. The S-matrix model is presented. Then, the 10-structure group delay (GD) is expressed. The theoretical equation explains that because of coupling, the 10-structure generates a bandpass NGD function around an NGD center frequency depending on the length of the 0 line. The analytical model is validated with a 10-microstrip structure. The calculated, simulated and measured results are in good correlation. The 10 prototype behaves as bandpass NGD function with 2.7 GHz center frequency, -6 ns NGD value with 6 dB insertion loss.