Multiplexer and wireless receiver

Details Multiplexer and wireless receiver Multiplexer and wireless receiver

2007-03-14

2009-11-03

Trinh, Sonny (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

C455S323000, C455S327000

Reexamination Certificate

active

07613434

ABSTRACT:
A multiplexer includes: a first band-pass filter for a first channel, which is formed in a microstrip line on a dielectric substrate and has a first branching characteristic having a center frequency of f1and an attenuation pole at a frequency of fa1; and a second band-pass filter for a second channel, which is formed in a microstrip line on a dielectric substrate and has a second branching characteristic having a center frequency of f2and an attenuation pole at a frequency of fa2. The following relationships (1) to (5) are satisfied: (1) f1<f2; (2) f1<fa1; (3) fa2<f2; (4) f2−fa1<(f2−f1)/2; and (5) fa2−f1<(f2−f1)/2. The second branching characteristic exhibits −20 dB or less at the frequency of fa1and the first branching characteristic exhibits −20 dB or less at the frequency of fa2.

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