3986–3994 Sachse K., The scattering parameters and directional coupler analysis of characteristically terminated asymmetric coupled transmission lines in an inhomogeneous medium, „IEEE Transactions on Microwave Theory and Techniques”, Apr 1990, vol. 38, Issue 4 Gruszczyński S., Sachse K., Wincza K., Reduced sidelobe four-beam antenna array fed by modified Butler matrix, „Electronics Letters”, 2006, vol. 42, nr 9, s. 508–509 Sachse K. , Sawicki A., Lower and Upper Bound Calculations on the Capacitance of Multiconductor Printed Transmission Line Using the Spectral-Domain Approach and Variational Method, „IEEE Transactions on Microwave Theory and Techniques”, Feb 1986, vol. 34, Issue 2
Gruszczyński S., Kuta S., Sachse K., Wincza K., Ultrabroadband 8x8 Butler matrix designed with the use of multisection directional couplers and phase correction networks. Microwave and Optical Technology Letters. 2012, vol. 54, nr 6, s. 1375–1380 Gruszczyński S., Sachse K., Wincza K., Broadband planar fully integrated 8 × 8 Butler matrix using copuled-line directional couplers, „IEEE Transactions on Microwave Theory and Techniques”, 2011, vol. 59, nr 10, s. 2441–2446 Gruszczyński S., Sachse K., Wincza K., Conformal four-beam antenna arrays with reduced sidelobes, „Electronics Letters”, 2008, vol. 44, nr 3, s.