Abstract: Devices and methods for facilitating the delivery of EM energy between microstrip transmission lines and dielectric-filled waveguides are provided. In a preferred embodiment, a transition for transferring EM energy to and from a microstrip transmission line incorporates a longitudinally extending housing with a first end and a second end, and defining an interior therebetween. An element feed is disposed at least partially within the housing, with a first end of the element feed being configured to electrically communicate with the microstrip transmission line. Additionally, a dielectric material preferably surrounds at least a portion of the element feed and is disposed at least partially within the housing so that the housing and the dielectric material form a dielectric-filled waveguide. So configured, the transition is able to transmit EM energy between the microstrip transmission line and the dielectric-filled waveguide.