Patent ID: 6335663
Filing Date: 2002-01-01
Classification: C03C,H03H

Abstract:
A method of configuring a multiplexer/demultiplexer including first to third ports each to be externally terminated with a pure resistance, said method comprising:making the third port to be a common port by connecting a first resonant circuit between the first port and ground, configuring the first resonant circuit to make serial resonance at a frequency within or in proximity of a first frequency band, connecting an inductive element in series between the first port and the third port, connecting a second resonant circuit between the second port and ground, and configuring the second resonant circuit to make serial resonance at a frequency within or in proximity of a second frequency band, which is different from the first frequency band, and connecting a capacitive element in series between the third port and the second port; wherein:the first resonant circuit is configured by connecting a coil on the side of the first port and connecting a capacitor on the side of ground, and/or the second resonant circuit is configured by connecting a coil on the side of the second port and connecting a capacitor on the side of ground; configuring the first resonant circuit, second resonant circuit, inductive elements, and capacitive elements on laminated ceramic substrates; and a glass ceramic material consisting of a mixture of 55-65% by weight of a glass composition powder consisting of 40-50% by weight SiO2, 30-40% by weight BaO, 3-8% by weight Al2O3, 8-12% by weight La2O3, and 3-6% by weight B2O3, and 45-35 by weight forsterite (Mg2SiO4) is used as the laminated ceramic material.