Dual Band Circurator for PHS/PDC Dual Band Cellular-phone Systems

摘要

A new concept for the dual band circulator use in 800 MHz PDC and 1.9 GHz PHS dual band cellular-phone systems is presented. This circulator consists of two circulator units for 800 MHz and 1.9 GHz bands, the former having a lumped constant structure with Tchebycheff broad band width and the latter, a distributed constant structure. These units are stacked coaxially in the same magnetic-field, and connected with an impedance matching circuit.