Ferreira, RiaanJoubert, Johan2015-08-132015-08-132015-09Ferreira, R & Joubert, J 2015, 'A broadband 180° hybrid ring coupler using a microstrip-to-slotline inverter', Microwave and Optical Technology Letters, vol. 57, no. 9, pp. 2164-2168.0895-2477 (print)1098-2760 (online)10.1002/mop.29299http://hdl.handle.net/2263/49262A new broadband 180° hybrid ring coupler with a Chebyshev return loss response, implemented in microstrip line, and a phase inverter using microstripto- slotline transitions, is presented. The transitions were constructed using via short circuits and optimized radial slot stubs. The manufactured prototype was found to operate over a 118% bandwidth in the frequency range 0.72-2.8 GHz.en© 2015 Wiley Periodicals, Inc. This is the pre-peer reviewed version of the following article : A broadband 180° hybrid ring coupler using a microstrip-to-slotline inverter, Microwave and Optical Technology Letters, vol. 57, no. 9, pp. 2164-2168, 2015. doi : 10.1002/mop.29299. The definite version is available at : http://onlinelibrary.wiley.comjournal/10.1002/(ISSN)1098-2760.Mirostrip-to-slotline transitionsMicrowave coupler180° hybridPhase inverterPostprint Article