Cognitive radio (CR) exploits the spectrum efficiently and minimizes the interference between different devices. Meanwhile, multiband frequency-reconfigurable antennas (FRA) are desirable for CR where it is beneficial to dynamically reconfigure a single antenna to be transmitted and/or received on multiple frequency bands. As stated by the literature review, there is a dearth of work into multiband FRA that is directly applied in CR applications with substrate-integrated waveguide (SIW) technology. Frequency-reconfigurable SIW (FRSIW) is seen as promising for the development of microwave and millimeter waveband antennas. This study’s key objective is for the technical operational advances of SIW antennas to be summarized and compared. The design structure of FRSIW elements using different techniques is discussed in detail. The findings supported the effectiveness of FRSIW for managing radio spectrum to work in most efficient way.

认知无线电（CR）有效地利用了频谱，并最大程度地减少了不同设备之间的干扰。同时，多频带频率可重构天线（FRA）对于CR是理想的，其中动态地重构将在多个频带上发送和/或接收的单个天线是有益的。如文献综述所述，缺乏多频带FRA的工作，该技术直接通过衬底集成波导（SIW）技术应用于CR应用。频率可重配置的SIW（FRSIW）被认为对微波和毫米波段天线的发展很有前途。这项研究的主要目标是对SIW天线的技术操作进展进行总结和比较。详细讨论了使用不同技术的FRSIW元件的设计结构。