H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
H03H7/48—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source
H03H7/482—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source particularly adapted for use in common antenna systems