With the rapid development of modern communication and radar technology, there is a need for the miniaturization, planarization, and modularization of microwave and millimeter-wave (mm-wave) systems, without losing excellent performance and reliability. The transmission line is the most basic component of microwave and mm-wave circuits and systems, and its characteristics-including loss, size, integration, cost, and weight-directly or indirectly affect the performance of the entire circuit and system. Commonly used transmission lines [1] include nonplanar transmission lines, such as a metal waveguide and coaxial line, and planar transmission lines, such as a microstrip, strip line, coplanar waveguide, and slot line.

中文翻译：

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SISL电路和系统的最新进展：无源和有源电路的回顾，展示了SISL的低损耗和自封装特性，并展示了金属，屏蔽，悬挂线的优点

随着现代通信和雷达技术的飞速发展，需要在不损失出色性能和可靠性的情况下使微波和毫米波（mm-wave）系统小型化，平坦化和模块化。传输线是微波和毫米波电路和系统的最基本组成部分，其特性（包括损耗，尺寸，集成度，成本和重量）直接或间接影响整个电路和系统的性能。常用的传输线[1]包括非平面传输线，例如金属波导和同轴线，以及平面传输线，例如微带，带状线，共面波导和缝隙线。