2015/10/05 by Wen Geyi, Geyi, Wen
Engineering · #Antenna Design and Analysis #Classical Physics (physics.class-ph) #FOS: Physical sciences #RFID technology advancements
paper · pdf · doi:10.48550/arxiv.1510.01013
openalex publication_date 2015/10/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Spherical wave functions play an important role in the theoretical study of antenna. When they are used to investigate the stored energy outside the circumscribing sphere of the antenna, two different types of modal quality factors appear which exhibit some interesting properties. These properties can be easily demonstrated by numerical tabulations but have never proved rigorously and have remained unsolved for many years. An attempt is made in this paper to try to solve these longstanding problems. New properties and new power series expansions for the modal quality factors have been obtained, which essentially belong to the spherical Bessel functions and therefore are universally applicable.