Kloke, Kevin HughJoubert, JohanOdendaal, J.W. (Johann Wilhelm)2015-11-162015-11-162015-10Kloke, KH, Joubert, J & Odendaal, JW 2015, 'Coaxial end-launched and microstrip to partial H-plane waveguide transitions', IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 10, pp. 3103-3108.0018-9480 (print)1557-9670 (online)10.1109/TMTT.2015.2469258http://hdl.handle.net/2263/50477Conventional rectangular waveguides are commonly used for high power and other microwave and millimeter-wave applications. Their use at lower frequencies has been limited by their bulky nature. A new type of compact waveguide called a partial H-plane waveguide has previously been proposed that has only one quarter of the cross-sectional area of a conventional waveguide. However, only limited information relating to the feeding of such waveguides is available. This paper presents two types of transitions to partial H-plane waveguides from the coaxial and microstrip transmission mediums. Additionally, in the coaxial case, the transition is end-launched to offer collinear properties. The development of both transitions is discussed and optimized designs presented with simulated and measured results over -band (3.95–5.85 GHz).en© 2015 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.Coaxial to waveguide transitionMicrostrip to waveguide transitionPartial H-plane waveguide transitionPostprint Article