Dual-band active filter

Details Dual-band active filter Dual-band active filter

2008-03-04

2008-03-04

Le, Thanh Cong (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S339000, C327S552000

Reexamination Certificate

active

11187844

ABSTRACT:
The present invention discloses a dual-band active filter having filtering response and positive pass-band gain. The dual-band active filter includes an input match unit for gain match of the dual-band active filter and for having a band-pass filtering response; a first gain stage electrically connected to the first input match unit for providing the flat gain of the dual-band active filter; an inter-stage unit electrically connected to the first gain stage for matching gain and for having a band-stop filter response; a second gain stage electrically connected to the inter stage unit for providing the flat gain of the dual-band active filter; and an output unit electrically connected to the second gain stage for matching the dual-band active filter and for having a low-pass filtering response. The dual-band active filter according to the present invention uses the cascade connection of multiple filter stages to have band-pass filtering response at two different frequency bands and obtain high stop-band attenuation by providing plural transmission zeros in the stop-band.

REFERENCES:
patent: 5995814 (1999-11-01), Yeh
patent: 7245186 (2007-07-01), Chang et al.
patent: 2005/0186935 (2005-08-01), Kawama et al.
Article entitled “An Original Topology of Dual-Band Filter with Transmission Zeros” by C. Quendo et al., 2003 IEEE MTT-S Digest, pp. 1093-1096.
Article entitled “Dual-Band Step-Impedance Bandpass Filter For Multimode Wireless LANs” by Sheng-Fuh Chang et al., published in Electronics Letters, Jan. 8, 2004, vol. 40, No. 1.

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