Wunderlich, S. Zhang, C. JACoW Publishing Geneva, Switzerland 2673-5547 978-3-95450-240-0 10.18429/JACoW-HIAT2022-TUP04 English 72-74 dipole rfq impedance ECR simulation Contribution to a conference proceedings 2022 2022-08 https://doi.org/10.18429/JACoW-HIAT2022-TUP04 https://jacow.org/hiat2022/papers/tup04.pdf A new design of a 4-rod RFQ has been developed and simulated. In contrast to conventional designs, it uses asymmetrical stem geometry in the vertical-longitudinal plane. The effect on dipole fields for different geometrical parameters were examined and will be discussed.