High frequency low-pass filter

Details High frequency low-pass filter High frequency low-pass filter

2005-05-17

2005-05-17

Trinh, Sonny (Department: 2687)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S150100, C455S339000, C455S176100

Reexamination Certificate

active

06895228

ABSTRACT:
A low pass filter (LPF) can realizes a sophisticated transmission filter usable in a dual-band application. The transmission filter features a compact size, a low cost, a lower insertion loss, and an excellent harmonics-suppression characteristic. In the LPF, a high pass filter (HPF) section working in a high frequency band or a band pass filter (BPF) section, is coupled with a first LPF section in parallel between an input terminal and an output terminal. The HPF section or the BPF section includes a switch circuit formed of one diode that switches the pass band thereof to a rejection band. When a signal supposed to pass through the first LPF section is input to the input terminal, the switch circuit is activated to change the HPF or the BPF section to the rejection band for blocking a second harmonics component from passing through the HPF or the BPF section.

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International Search Report corresponding to application No. PCT/JP01/11177 dated Apr. 9, 2002.
English translation of PCT/ISA/210.

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