JNM 2024 Special Issue

held during the 2024 edition of the JNM (French Microwave Days), hosted at the Palais des Congrs, in Antibes-Juan Les Pins, France.This conference was held from the 4th to the 7th of June in 2024.Since it was first held in Limoges in 1976, the Journes Nationales Microondes (JNMs) have become a key event for the French microwave community, providing an opportunity every 2 years (except for the Covid period) to meet and discuss the most relevant research topics in the field.This event brings together French academic and industrial players working in the field of microwaves, from materials, components, circuits, and antennas to communication and detection systems, as well as their many areas of applications (security, defense, space, environment, and health).It is also an opportunity for the Ph.D. students to present their work, often for the first time in public, and to meet their future colleagues.Over the years, the JNM has become the second-largest European conference in the field of microwave techniques and technologies, attracting more than 500 participants.For this edition, the scientific committee has selected 255 papers presented in 32 oral sessions and 12 poster sessions.The work presented in this special issue was subject to a selection procedure, with the highest-ranking short papers receiving an invitation for an extended paper.These extended manuscripts have then undergone a regular review process before their final acceptance for this edition.We would like to warmly thank the authors, the reviewers, the editorial board of IJMWT,