This virtual issue on satellite communication and navigation technology contains 10 articles published in CJE from 2020 to present. These papers cover the research topics  with respect to some applications of satellite communication and satellite navigation.

We are constantly using computer vision to grab images, interpret their meaning, and store them for later use. Image classification in computer vision is a very large research field, including a variety of technologies, with the popularity of deep learning, image classification has developed rapidly. Image classification is and will continue to be the most popular computer vision subfield in the next decade. This virtual issue collects 7 related articles on Image Classification from 2020 to 2022 based on this research direction. Welcome to read them.

The virtual issue on CMOS technology contains 5 articles published in CJE recently. These papers cover the research topics ranging from analysis and fabrication of CMOS components to CMOS sensors design.

This virtual issue is a collection of 5 articles published in CJE in the last two years for the research on compressed sensing.

With the development of artificial intelligence, machine learning has entered more and more practical application fields. In the practical application of machine learning, the number of features is usually large. Feature selection can eliminate irrelevant or redundant features, so as to reduce the number of features, improve model accuracy and reduce running time. Focusing on this research topic, this virtual issue collects 9 relevant articles on feature selection from 2016 to 2021.

This virtual issue summarizes the most recent research results on various disciplines of electromagnetics and antennas, promoting the new progress of theories and methodologies. 7 papers are selected with domains ranging from antenna design and evaluation, EMC in High-speed railway system as well as analysis and evaluation of electromagnetics disturbance in various scenarios.