The fast spread of wireless and high‐speed communications brings the need for providing inexpensive and compact microwave circuits at very high frequencies. A promising approach is the development of the modern multilevel or three‐dimensional monolithic microwave integrated circuits (MMIC), printed circuit boards (PCB), and the new technologies for integration of millimeter‐wave systems like low‐temperature cofire ceramics (LTCC). In such environments, stripline‐like components play a key role and focus a great interest nowadays, because multilayer, embedded transmission line (ETL) based on stripline configurations originates from the three‐dimensional packages. Moreover, stripline is one of the preferred transmission lines in most of this environments because, among other advantages, radiation and dispersion are negligible and ground planes provide effective shielding. For example, in antenna feeding, stripline has probed to be a compact and effective solution. In filter applications, suspended striplines are extensively used by engineers because of their low unloaded Q‐factor. However, the multiconductor and multilayer structures present some complications derived from the shorting posts or via holes, spurious modes that result in crosstalk and losses, complex geometries, and so on. In many cases, it is necessary to find new design solutions to avoid parallel‐plate mode coupling, but full‐wave analysis becomes a complicated task. In this article, these issues are exposed, and both classic stripline components and new multilayer structures are presented. We discuss some design considerations, advantages and drawbacks, classic and new devices, and modern solutions recently reported for old and new necessities of the design and analysis of stripline configurations.