Composite multiplexer circuit and chip component, high-frequency module and radio communication apparatus using the same
First Claim
1. A composite multiplexer circuit for multiplexing a plurality of frequency bands, comprisinga plurality of multiplexer circuits connected in parallelat least one of multiplexer circuits for extracting one frequency band having a matching network including an inductor and a capacitor, and a surface acoustic wave filter connected in series with the matching network, whereinin an individual frequency band of the plurality of frequency bands, a total sum of real parts of admittances normalized by a characteristic admittance, as view from a junction point connected with an antenna terminal to all the multiplexer circuits, is 1 whereas the total sum of imaginary parts of the admittances is 0.
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Accused Products
Abstract
In a composite multiplexer circuit designed to multiplex plural frequency bands by interconnecting plural multiplexer circuits in parallel, a multiplexer circuit for extracting a frequency band of a GPS reception system includes a matching network including an inductor and a capacitor, and a surface acoustic wave filter connected in series with the matching network. The multiplexer circuit for the GPS reception system can be so set as to have infinite impedances at the other frequency bands than the frequency band thereof. This prevents signals in the other frequency bands from leaking into the multiplexer circuit for the GPS reception system.
36 Citations
16 Claims
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1. A composite multiplexer circuit for multiplexing a plurality of frequency bands, comprising
a plurality of multiplexer circuits connected in parallel at least one of multiplexer circuits for extracting one frequency band having a matching network including an inductor and a capacitor, and a surface acoustic wave filter connected in series with the matching network, wherein in an individual frequency band of the plurality of frequency bands, a total sum of real parts of admittances normalized by a characteristic admittance, as view from a junction point connected with an antenna terminal to all the multiplexer circuits, is 1 whereas the total sum of imaginary parts of the admittances is 0.
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14. A composite multiplexer circuit for multiplexing a plurality of frequency bands, comprising:
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a plurality of multiplexer circuit connected in parallel, wherein at least one of the multiplexer circuits for extracting one frequency band having a high pass filter including an inductor and a capacitor, and a band elimination filter, wherein in an individual frequency band of the plurality of frequency bands, a total sum of real parts of admittances normalized by a characteristic admittance, as view from a junction point connected with an antenna terminal to all the multiplexer circuits, is 1 whereas the total sum of imaginary parts of the admittances is 0. - View Dependent Claims (15, 16)
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Specification