###### Abstract  
The area of modern wireless communication systems has experienced rapid growth, leading to a rising demand for multifunctional devices capable of providing various wireless services. For these devices, the antennas need to possess key characteristics: compactness, multifunctionality, and consistent high performance across different environments. A critical aspect in communication systems is ensuring the correct orientation between transmitters and receiver systems [1]. Circular/dual-polarized antennas offer effective solutions to address this challenge. These antennas enable reliable and efficient signal transmission and reception. In addition, reconfigurable and switchable antennas have garnered significant interest in diverse applications, such as cognitive radio. By incorporating active elements, these antennas can operate across multiple bands and generate different radiation patterns, providing versatility and adaptability in their functions [2]. Employing MIMO and phased array systems with several smart antenna elements can significantly increase the system capacity. As a result, these technologies hold considerable promise for meeting the requirements of future 5G networks, where higher data rates and seamless connectivity are essential. However, implementing MIMO antenna systems in a limited space presents urgent challenges, particularly in reducing mutual couplings from adjacent elements. In today's context, miniaturization of wireless and handheld devices has become a necessity [3]. Miniaturized antennas with the integration of metamaterial cells, Electromagnetic Band Gap (EBG) structures, and Frequency Selective Surfaces (FSS) are gaining importance. These advanced materials and structures allow for efficient antenna designs, making them indispensable components in modern wireless technologies. Furthermore, the quest for small, low-cost antennas remains high on the agenda. These antennas are highly desirable for various applications, including Radio Frequency Identification (RFID) and Ultra-Wideband (UWB) systems [4]. As wireless communication continues to evolve, addressing these challenges and incorporating innovative antenna technologies will pave the way for more efficient, versatile, and reliable wireless devices and systems, meeting the ever-increasing demands of the modern world. Therefore, antennas play a pivotal role in modern wireless communication systems and, as technology continues to evolve, the demand for more efficient, compact, and multifunctional antennas becomes ever more apparent. The scope of this Special Issue is to provide a comprehensive overview of the latest developments and innovative methodologies in the design, analysis, and measurement of antennas. It comprises a collection of 11 papers that explore various aspects of antenna design, analysis, and measurement for emerging wireless communication systems. Each paper delves into specific topics and advancements within the field, contributing to the overall objective of shedding light on novel approaches and encouraging further research into this exciting area. The brief explanations of these papers are as follows:  
[PERSON] et al. [5] introduce a low-profile Wi-Fi antenna designed to deliver optimized radiations for Uncrew Aerial Vehicle (UAV) applications. Specifically engineered for mounting on small UAVs, on the non-metallic wing's outermost side, this antenna exhibits impressive impedance bandwidths across two frequency ranges: 2.11 to 2.58 GHz and 5.06 to 7.5 GHz. The antenna's radiation patterns have been carefully optimized at 5.8 and 2.4 GHz, ensuring enhanced antenna gain as the small UAV operates at greater distances in urban and open environments, respectively. Moreover, it demonstrates excellent vertically polarized radiation, making it well-suited for long-distance communication applications. [PERSON] et al. [6] investigate the development and verification of an antenna tailored for Ka-band 5G networks.