Bandwidth Potential, Electromagnetic and Duplex Isolation of Tunable Capacitive Coupling Element Antennas for 4G Smartphones

Current antenna design includes radiating elements whose performance is difficult to analyze with standard performance metrics such as scattering parameters. In this paper we present simulation results analyzing different Capacitive Coupling Elements (CCEs) tunable antenna topologies for 4G smartphones. Scattering parameters, tuning range and novel performance metrics such as both electromagnetic and duplex isolation are presented. It is found that the arrangement of radiators on the groundplane has a significant effect in determining the mutual coupling level, while configurations exhibiting a high bandwidth potential also lead to low isolation. Electromagnetic isolation also depends on the topology, while the duplex isolation is similar for each configuration as they represent comparable volumes on the groundplane.