Reconfigurable and tunable radio frequency (RF) and microwave (MW) components have become exciting topics for many researchers and design engineers in recent years. Reconfigurable microstrip filter–antenna combinations have been studied in the literature to handle multifunctional tasks for wireless communication systems. Using such devices can reduce the need for many RF components and minimize the cost of the whole wireless system, since the changes in the performance of these applications are achieved using electronic tuning techniques. However, with the rapid development of current fourth-generation (4G) and fifth-generation (5G) applications, compact and reconfigurable structures with a wide tuning range are in high demand. However, meeting these requirements comes with some challenges, namely the increased design complexity and system size. Accordingly, this paper aims to discuss these challenges and review the recent developments in the design techniques used for reconfigurable filters and antennas, as well as their integration. Various designs for different applications are studied and investigated in terms of their geometrical structures and operational performance. This paper begins with an introduction to microstrip filters, antennas, and filtering antennas (filtennas). Then, performance comparisons between the key and essential structures for these aspects are presented and discussed. Furthermore, a comparison between several RF reconfiguration techniques, current challenges, and future developments is presented and discussed in this review. Among several reconfigurable structures, the most efficient designs with the best attractive features are addressed and highlighted in this paper to improve the performance of RF and MW front end systems.

中文翻译：

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可重构微带滤波器-天线集成研究：最新进展和挑战

近年来，可重新配置和可调的射频（RF）和微波（MW）组件已成为许多研究人员和设计工程师的令人兴奋的主题。在文献中已经研究了可重配置的微带滤波器-天线组合，以处理无线通信系统的多功能任务。使用此类设备可以减少对许多RF组件的需求，并使整个无线系统的成本降至最低，因为使用电子调谐技术可以实现这些应用程序性能的变化。但是，随着当前第四代（4G）和第五代（5G）应用的快速发展，对具有宽调谐范围的紧凑且可重新配置的结构提出了很高的要求。但是，满足这些要求带来了一些挑战，即设计复杂性和系统尺寸的增加。因此，本文旨在讨论这些挑战并回顾用于可重配置滤波器和天线的设计技术及其集成的最新发展。根据其几何结构和运行性能研究和研究了针对不同应用的各种设计。本文首先介绍微带滤波器，天线和滤波天线（filtennas）。然后，对这些方面的关键和基本结构之间的性能比较进行了介绍和讨论。此外，本综述介绍并讨论了几种RF重新配置技术，当前挑战和未来发展之间的比较。在几种可重新配置的结构中，