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    The Effect of Impedance Mismatch on Phase Linearity of GCPW Loaded Transmission Lines and Shunt Stubs


    Ibrahim, Sarah and Szczepkowski, Grzegorz and Farrell, Ronan (2014) The Effect of Impedance Mismatch on Phase Linearity of GCPW Loaded Transmission Lines and Shunt Stubs. In: ISSC 2014, July 26-27 2014, University of Limerick.

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    Abstract

    This paper presents a study on the effect of impedance mismatch on phase linearity (group delay variations) in grounded coplanar waveguide (GCPW) structures. Two 400 ps GCPW delay lines were designed using a short circuited stub and a trans- mission line. The structures were simulated over a wide frequency range (0.1 GHz- 5 GHz) using both ADS circuit model and CST electromagnetic simulation tool. Based on mathematical analysis and simulation results, impedance mismatch appears to have a large e_ect on group delay variations in stubs when compared to transmission lines. The simulated time delay of the short circuited stub shows a maximum delay deviation of ±0.75% and ±7.4% for 1.6% and 5.8% impedance mismatch values, respectively. On the other hand, the transmission delay line simulation results show only ±0.1% and ±1.5% for the same impedance mismatch. For the electromagnetic simulation, the presented results indicate even larger variation of time delay for GCPW short stub as it reaches ±3.75% and ±7.5% at 2 GHz and 4.5 GHz for 1.6% impedance mismatch, respectively

    Item Type: Conference or Workshop Item (Paper)
    Keywords: coplanar waveguides; switched delay lines; linear phase; shunt stubs; phase shifters; impedance mismatch;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 5362
    Depositing User: Dr. Ronan Farrell
    Date Deposited: 04 Sep 2014 13:00
    Journal or Publication Title: Proceedings of ISSC 2014
    Refereed: Yes
    Funders: Science Foundation Ireland under Grant No. 10/CE/I1853
    URI:

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